NORTHERN INSTITUTIONAL FUNDS
485APOS, 2000-01-28
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        As filed with the Securities and Exchange Commission on January 28, 2000
                                 Securities Act of 1933 Registration No. 2-80543
                        Investment Company Act of 1940 Registration No. 811-3605


                                        SECURITIES AND EXCHANGE COMMISSION
                                              Washington, D.C. 20549

                                                     FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933    [X]

         Pre-Effective Amendment No. ____   [   ]
         Post-Effective Amendment No. 43    [X]

                                                      and/or

REGISRTATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

                              Amendment No. 44 [X]
                        (Check appropriate box or boxes)


                          NORTHERN INSTITUTIONAL FUNDS
               (Exact Name of Registrant as Specified in Charter)

                             50 South LaSalle Street
                             Chicago, Illinois 60675
                    (Address of Principal Executive Offices)

                                  800-637-1380
              (Registrant's Telephone Number, including Area Code)



Linda Hoard, Secretary                                with a copy to:
PFPC Inc.                                             W. Bruce McConnel
101 Federal Street, 6th Floor                         Drinker Biddle & Reath LLP
Boston, Massachusetts 02110                           One Logan Square
                                                      18th and Cherry Streets
                                                      Philadelphia, Pennsylvania
                                                      19103-6996

(Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering:
As soon as practicable after this Registration Statement becomes
effective.

It       Is Proposed That This Filing Become Effective (Check  Appropriate Box):

[ ]  immediately  upon filing  pursuant to paragraph  (b)
[ ] on (date) pursuant  to  paragraph  (b)
[X] 60  days  after  filing  pursuant  to paragraph (a)(1)
[ ] On  (date)pursuant to paragraph (a)(1)
[ ] 75 days after  filing  pursuant to paragraph  (a)(2)
[ ] On (date)  pursuant to paragraph (a)(2)

If appropriate, check the following box:
         [   ] This post-effective amendment designates a new effective date for
             a previously filed post-effective amendment.



<PAGE>



Northern Institutional Funds
Fixed Income and Equity Portfolios

      U.S. Government Securities Portfolio
      Short-Intermediate Bond Portfolio
      Intermediate Bond Portfolio
      U.S. Treasury Index Portfolio
      Bond Portfolio
      International Bond Portfolio
      Balanced Portfolio
      Equity Index Portfolio
      Diversified Growth Portfolio
      Focused Growth Portfolio
      MarketCommand Portfolio
      Mid Cap Growth Portfolio
      Small Company Index Portfolio
      Small Company Growth Portfolio
      International Equity Index Portfolio
      International Growth Portfolio

Prospectus dated April 1, 2000

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  An  investment  in a Portfolio  involves  investment  risks,  including
possible loss of principal.

The  Securities and Exchange  Commission  has not approved or disapproved  these
securities or passed upon the adequacy of this Prospectus. Any representation to
the contrary is a criminal offense.



<PAGE>


Table of Contents
<TABLE>
<CAPTION>
<S><C>                                                 <C>                                             <C>

                                                                                                        Page
- ------------------------------------------------------ ---------------------------------------------------------
Risk/Return Summary                                    Fixed Income Portfolios
Information about the objectives, principal            o    U.S. Government Securities Portfolio
strategies and risk characteristics of each            o    Short-Intermediate Bond Portfolio
Portfolio                                              o    Intermediate Bond Portfolio
                                                       o    U.S. Treasury Index Portfolio
                                                       o    Bond Portfolio
                                                       o    International Bond Portfolio

                                                       Balanced Portfolio

                                                       Equity    Portfolios    o
                                                       Equity Index  Portfolio o
                                                       Diversified        Growth
                                                       Portfolio    o    Focused
                                                       Growth     Portfolio    o
                                                       MarketCommand Portfolio o
                                                       Mid Cap Growth  Portfolio
                                                       o  Small   Company  Index
                                                       Portfolio o Small Company
                                                       Growth     Portfolio    o
                                                       International      Equity
                                                       Index     Portfolio     o
                                                       International      Growth
                                                       Portfolio

                                                       Principal Investment Risks

                                                       Portfolio  Performance  o
                                                       U.S.           Government
                                                       Securities   Portfolio  o
                                                       Short-Intermediate   Bond
                                                       Portfolio o  Intermediate
                                                       Bond   Portfolio  o  U.S.
                                                       Treasury Index  Portfolio
                                                       o   Bond    Portfolio   o
                                                       International        Bond
                                                       Portfolio    o   Balanced
                                                       Portfolio o Equity  Index
                                                       Portfolio  o  Diversified
                                                       Growth     Portfolio    o
                                                       Focused Growth  Portfolio
                                                       o  Small   Company  Index
                                                       Portfolio o International
                                                       Equity Index  Portfolio o
                                                       International      Growth
                                                       Portfolio

                                                       Portfolio Fees and Expenses

Management of the Portfolios                           Investment Advisers
Details that apply to the Portfolios as a group        Advisory Fees
                                                       Portfolio Management
                                                       Other Portfolio Management Information
                                                       Other Portfolio Services

- ------------------------------------------------------ ---------------------------------------------------------

- ------------------------------------------------------ ---------------------------------------------------------
About Your Account                                     Purchasing and Selling Shares
How to open, maintain and close an account             o    Purchasing Shares
                                                       o    Opening an Account
                                                       o    Selling Shares

                                                       Account    Policies   and
                                                       Other    Information    o
                                                       Purchase  and  Redemption
                                                       Minimums  o   Calculating
                                                       Share  Price o Timing  of
                                                       Purchase    Requests    o
                                                       Additional    Transaction
                                                       Fee o Tax  Identification
                                                       Number     o      In-Kind
                                                       Purchases and Redemptions
                                                       o Miscellaneous  Purchase
                                                       Information  o Timing  of
                                                       Redemption and Exchange
                                                            Requests
                                                       o    Miscellaneous Redemption Information
                                                       o    Exchange Privileges
                                                       o    Telephone Transactions
                                                       o    Making Changes to Your Account
                                                            Information
                                                       o    Business Day
                                                       o    Early Closings
                                                       o    Authorized Intermediaries
                                                       o    Servicing Agents

                                                       Dividends and Distributions
                                                       Tax Considerations
                                                       Year 2000 Issues

Risks, Securities, Techniques                          Risks, Securities and Techniques
and Financial Information                              o    Additional Information on Investment
                                                       Objectives, Principal Investment Strategies
                                                            and Related Risks
                                                       o    Additional Description of Securities and
                                                            Common Investment Techniques
                                                       o    Disclaimers

                                                       Financial Information

For More Information                                   Annual/Semiannual Report
                                                       Statement of Additional Information

- ------------------------------------------------------ ---------------------------------------------------------

</TABLE>



<PAGE>



Northern  Institutional  Funds (the  "Trust")  offers a selection of  investment
portfolios to institutional investors, each with a distinct investment objective
and risk/reward profile.

The  descriptions on the following pages may help you choose the portfolios that
best fit your investment  needs.  Keep in mind,  however,  that no portfolio can
guarantee it will meet its  investment  objective,  and no  portfolio  should be
relied upon as a complete investment program.

This  Prospectus  describes the six fixed  income,  one balanced and nine equity
portfolios (the "Portfolios")  currently offered by the Trust. Each Portfolio is
authorized  to offer  three  classes  of  shares:  Class A,  Class C and Class D
Shares.  The Trust also offers three  classes of shares of its five money market
portfolios which are described in a separate prospectus.

In addition to the instruments  described on the pages below, each Portfolio may
use various investment techniques in seeking its investment  objective.  You can
learn more about these  techniques  and their related  risks by reading  "Risks,
Securities,  Techniques and Financial Information" beginning on page ___ and the
Statement of Additional Information. As used in this Prospectus the term "equity
securities" includes common stocks,  preferred stocks,  interests in real estate
investment trusts,  convertible debt obligations,  convertible preferred stocks,
equity  interest in trusts,  partnerships,  joint  ventures,  limited  liability
companies and similar enterprises, warrants and stock purchase rights.



<PAGE>


U.S. Government Securities Portfolio

Investment Objective

The Portfolio seeks to maximize total return with minimal reasonable risk.

Principal Investment Strategies and Risks

Investment Strategies.  The Portfolio will seek capital appreciation and current
income in its attempt to maximize total return.  In doing so, the Portfolio will
invest,  under normal market  conditions,  at least 65% of its total assets in a
broad range of  securities  issued or  guaranteed  by the U.S.  government,  its
agencies  or  instrumentalities  and  repurchase  agreements  relating  to  such
securities. These may include:

               U.S. Treasury bills, notes and bonds
               Obligations of U.S. government agencies and instrumentalities
               Mortgage-related securities issued by U.S. government agencies
               Stripped securities evidencing ownership of future interest
               or principal payments on obligations
              of the U.S. government, its agencies or instrumentalities

In buying and selling  securities for the Portfolio,  the investment  management
team uses a relative  value  approach.  This  approach  involves  an analysis of
general economic and market conditions.  It also involves the use of models that
analyze and compare expected returns and assumed risks. Under the relative value
approach,  the investment  management team will emphasize particular  securities
and  types  of  securities  (such  as  treasury,   agency  and  mortgage-related
securities)  that the team  believes  will  provide a favorable  total return in
light of these risks. In this regard, the management team will consider not only
the  income  the  Portfolio  will  receive  from its  investments,  but also the
likelihood  that  particular  securities or types of securities will have a more
favorable or improving credit outlook. The investment management team may engage
in active  trading,  and will not consider  portfolio  turnover  rate a limiting
factor in making decisions for the Portfolio.

The  Portfolio's  dollar-weighted  average  maturity  will,  under normal market
conditions, range between one and five years.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts, options and swaps for both hedging and non-hedging purposes.

Risks.  These  primary  investment  risks  apply  to  the  Portfolio:   interest
rate/maturity,  prepayment (or call),  debt  extension,  government  securities,
derivatives  and  portfolio  turnover  risks.  See page __ for  these  risks and
primary risks common to all Portfolios.



<PAGE>


Short-Intermediate Bond Portfolio

Investment Objective

The Portfolio seeks to maximize total return consistent with reasonable risk.

Principal Investment Strategies and Risks

Investment Strategies.  The Portfolio will seek capital appreciation and current
income in its attempt to maximize total return.  In doing so, the Portfolio will
invest,  under normal market  conditions,  at least 65% of its total assets in a
broad range of bonds and other fixed income securities. These may include:

          Obligations of the U.S. government,  its agencies or instrumentalities
     and repurchase agreements collateralized by such obligations Obligations of
     state,  local and foreign  governments  Obligations of domestic and foreign
     banks and  corporations  Zero  coupon  bonds,  debentures  and  convertible
     debentures  Mortgage and other asset-backed  securities Stripped securities
     evidencing  ownership  of future  interest  or  principal  payments on debt
     obligations

Although the  Portfolio  primarily  invests in  investment  grade  domestic debt
obligations (i.e.,  obligations rated within the top four rating categories by a
Nationally  Recognized  Statistical  Rating  Organization),  it may  invest to a
limited  extent in  obligations  of foreign  issuers and in securities  that are
rated below investment grade ("junk bonds").

In buying and selling  securities for the Portfolio,  the investment  management
team uses a relative  value  approach.  This  approach  involves  an analysis of
general economic and market conditions.  It also involves the use of models that
analyze and compare expected returns and assumed risks. Under the relative value
approach,  the investment  management team will emphasize particular  securities
and  types  of  securities  (such  as  treasury,  agency,  mortgage-related  and
corporate  securities) that the team believes will provide a favorable return in
light of these risks. In this regard, the management team will consider not only
the  income  the  Portfolio  will  receive  from its  investments,  but also the
likelihood  that  particular  securities or types of securities will have a more
favorable or improving credit outlook.

The  Portfolio's  dollar-weighted  average  maturity  will,  under normal market
conditions, range between two and five years.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts, options and swaps for both hedging and non-hedging purposes.

Risks.  These  primary  investment  risks  apply  to  the  Portfolio:   interest
rate/maturity,  credit  (or  default),  prepayment  (or call),  debt  extension,
government securities,  currency,  country,  foreign regulatory,  high-yield and
derivatives  risks.  See page __ for these risks and primary risks common to all
Portfolios.



<PAGE>


Intermediate Bond Portfolio

Investment Objective

The Portfolio seeks to maximize total return consistent with reasonable risk.

 Principal Investment Strategies and Risks

Investment Strategies.  The Portfolio will seek capital appreciation and current
income in its attempt to maximize total return.  In doing so, the Portfolio will
invest,  under normal market  conditions,  at least 65% of its total assets in a
broad range of bonds and other fixed income securities. These may include:

          Obligations of the U.S. government,  its agencies or instrumentalities
     and repurchase agreements collateralized by such obligations Obligations of
     state,  local and foreign  governments  Obligations of domestic and foreign
     banks and  corporations  Zero  coupon  bonds,  debentures  and  convertible
     debentures  Mortgage and other asset-backed  securities Stripped securities
     evidencing  ownership  of future  interest  or  principal  payments on debt
     obligations

Although the  Portfolio  primarily  invests in  investment  grade  domestic debt
obligations (i.e.,  obligations rated within the top four rating categories by a
Nationally  Recognized  Statistical  Rating  Organization),  it may  invest to a
limited  extent in  obligations  of foreign  issuers and in securities  that are
rated below investment grade ("junk bonds").

In buying and selling  securities for the Portfolio,  the investment  management
team uses a relative  value  approach.  This  approach  involves  an analysis of
general economic and market conditions.  It also involves the use of models that
analyze and compare expected returns and assumed risks. Under the relative value
approach,  the investment  management team will emphasize particular  securities
and  types  of  securities  (such  as  treasury,  agency,  mortgage-related  and
corporate  securities) that the team believes will provide a favorable return in
light of these risks. In this regard, the management team will consider not only
the  income  the  Portfolio  will  receive  from its  investments,  but also the
likelihood  that  particular  securities or types of securities will have a more
favorable or improving credit outlook.

The  Portfolio's  dollar-weighted  average  maturity  will,  under normal market
conditions, range between three and ten years.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts, options and swaps for both hedging and non-hedging purposes.

Risks.  These  primary  investment  risks  apply  to  the  Portfolio:   interest
rate/maturity,  credit  (or  default),  prepayment  (or call),  debt  extension,
derivatives,  currency,  country,  foreign  regulatory and high-yield risks. See
page __ for these risks and primary risks common to all Portfolios.




<PAGE>


U.S. Treasury Index Portfolio

Investment Objective

The Portfolio seeks to provide investment results  approximating the performance
of the Lehman Brothers Treasury Bond Index (the "Lehman Index").

The  Lehman  Index is an  unmanaged  index that  includes a broad  range of U.S.
Treasury  obligations  and is considered  representative  of U.S.  Treasury bond
performance  overall.  As of November 30, 1999, the duration of Lehman Index was
5.37 years.

Lehman Brothers  ("Lehman") does not endorse any of the securities in the Index.
It is not a sponsor of the U.S.  Treasury Index  Portfolio and is not affiliated
with the Portfolio in any way.

Principal Investment Strategies and Risks

Investment Strategies. Under normal market conditions, the Portfolio will invest
substantially all (at least 80%) of its total assets in a representative  sample
of the U.S. Treasury  obligations included in the Lehman Index. These securities
will be bought and sold based on their expected  contribution to the Portfolio's
overall duration and total return as compared to the Lehman Index and comparable
investment characteristics.

The  Portfolio  is  passively  managed,  which means it tries to  duplicate  the
investment  composition  and  performance  of the Lehman  Index  using  computer
programs and statistical procedures. As a result, the investment management team
does  not  use  traditional  methods  of  fund  investment  management  for  the
Portfolio, such as selecting securities on the basis of economic,  financial and
market analysis.  Because the Portfolio will have fees and transaction  expenses
(while the Index has none), returns are likely to be below those of the Index.

The  Investment  Adviser  expects  that,  under normal  market  conditions,  the
quarterly  performance  of  the  Portfolio,  before  expenses,  will  track  the
performance of the Lehman Index within a .95 correlation coefficient.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts, options and swaps for both hedging and non-hedging purposes.

Risks. These primary investment risks apply to the Portfolio: tracking, interest
rate/maturity,  prepayment (or call), debt extension, derivatives and government
securities  risks.  See page __ for these risks and primary  risks common to all
Portfolios.



<PAGE>


Bond Portfolio

Investment Objective

The Portfolio seeks to maximize total return consistent with reasonable risk.

Principal Investment Strategies and Risks

Investment Strategies.  The Portfolio will seek capital appreciation and current
income in its attempt to maximize total return.  In doing so, the Portfolio will
invest,  under normal market  conditions,  at least 65% of its total assets in a
broad range of bonds and other fixed income securities. These may include:

          Obligations of the U.S. government,  its agencies or instrumentalities
     and repurchase agreements collateralized by such obligations Obligations of
     state,  local and foreign  governments  Obligations of domestic and foreign
     banks and  corporations  Zero  coupon  bonds,  debentures  and  convertible
     debentures  Mortgage and other asset-backed  securities Stripped securities
     evidencing  ownership  of future  interest  or  principal  payments on debt
     obligations

Although the  Portfolio  invests  primarily in  investment  grade  domestic debt
obligations (i.e.,  obligations rated within the top four rating categories by a
Nationally  Recognized  Statistical  Rating  Organization),  it may  invest to a
limited  extent in  obligations  of foreign  issuers and in securities  that are
rated below investment grade ("junk bonds").

In buying and selling  securities for the Portfolio,  the investment  management
team uses a relative  value  approach.  This  approach  involves  an analysis of
general economic and market conditions.  It also involves the use of models that
analyze and compare expected returns and assumed risks. Under the relative value
approach,  the investment  management team will emphasize particular  securities
and  types  of  securities  (such  as  treasury,  agency,  mortgage-related  and
corporate  securities) that the team believes will provide a favorable return in
light of these risks. In this regard, the management team will consider not only
the  income  the  Portfolio  will  receive  from its  investments,  but also the
likelihood  that  particular  securities or types of securities will have a more
favorable or improving credit outlook.

The  Portfolio's  dollar-weighted  average  maturity  will,  under normal market
conditions, range between five and fifteen years.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts, options and swaps for both hedging and non-hedging purposes.

Risks.  These  primary  investment  risks  apply  to  the  Portfolio:   interest
rate/maturity,  credit  (or  default),  prepayment  (or call),  debt  extension,
derivatives,  currency,  country,  foreign  regulatory and high-yield risks. See
page __ for these risks and primary risks common to all Portfolios.



<PAGE>


International Bond Portfolio

Investment Objective

The Portfolio seeks to maximize total return consistent with reasonable risk.

Principal Investment Strategies and Risks

Investment Strategies.  The Portfolio will seek capital appreciation and current
income in its attempt to maximize total return.  In doing so, the Portfolio will
invest,  under normal market  conditions,  at least 65% of its total assets in a
broad range of bonds and other fixed income securities of foreign issuers. These
may include:

               Obligations   of  foreign   governments,   their   agencies   and
               instrumentalities   Obligations  of  supranational  organizations
               (such as the World Bank) Obligations of foreign  corporations and
               banks Zero coupon bonds, debentures and convertible debentures of
               foreign  issuers  Mortgage and other  asset-backed  securities of
               foreign issuers

The Portfolio will invest in the securities of issuers located in at least three
different foreign countries.  Although the Portfolio primarily invests in mature
markets  (such as Germany  and Japan),  it may also  invest in emerging  markets
(such as  Argentina  and  China).  Investments  are made based on the  portfolio
management team's outlook for the relative economic growth,  expected  inflation
and other economic and political prospects of each country or region.

The Portfolio  may also invest a portion of its assets in domestic  obligations,
including obligations of the U.S. government, its agencies and instrumentalities
and repurchase agreements collateralized by such obligations. It may also invest
in the  obligations  of  domestic  banks and  corporations  zero  coupon  bonds,
debentures  and  convertible  debentures,  and mortgage  and other  asset-backed
securities.

Although  the  Portfolio  primarily  invests in  investment  grade fixed  income
securities  (i.e.,  obligations rated within the top four rating categories by a
Nationally  Recognized  Statistical  Rating  Organization),  it may  invest to a
limited  extent in  securities  that are rated  below  investment  grade  ("junk
bonds").

In buying and selling  securities for the Portfolio,  the investment  management
team uses a relative  value  approach.  This  approach  involves  an analysis of
general economic and market conditions.  It also involves the use of models that
analyze and compare expected returns and assumed risks. Under the relative value
approach,  the investment  management team will emphasize particular  securities
and types of securities (such as foreign governmental, supranational and foreign
corporate obligations) that the team believes will provide a favorable return in
light of these risks. In this regard, the management team will consider not only
the  income  the  Portfolio  will  receive  from its  investments,  but also the
likelihood  that  particular  securities or types of securities will have a more
favorable or improving credit outlook.

The  Portfolio's  dollar-weighted  average  maturity  will,  under normal market
conditions, range between three and eleven years.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts,   options,   swaps  and  currency  contracts  for  both  hedging  and
non-hedging purposes.

The Portfolio is "non-diversified" under the Investment Company Act of 1940 (the
"1940  Act"),  and  may  invest  more  of  its  assets  in  fewer  issuers  than
"diversified" mutual funds.

Risks.  These  primary  investment  risks  apply  to  the  Portfolio:   interest
rate/maturity,  credit  (or  default),  prepayment  (or call),  debt  extension,
government  securities,  derivatives,  currency,  country,  foreign  regulatory,
emerging  markets,  high-yield and  non-diversification  risks.  See page __ for
these risks and primary risks common to all Portfolios.

Balanced Portfolio

Investment Objective

The  Portfolio  seeks to provide  long-term  capital  appreciation  and  current
income.

Principal Investment Strategies and Risks

Investment  Strategies.  In seeking long-term  capital  appreciation and current
income,  the Portfolio will, under normal market  conditions invest up to 75% of
the value of its total  assets  in equity  securities  and at least 25% in fixed
income securities.  Within these limitations, the actual mix of assets will vary
depending on the investment  management  team's  analysis of market and economic
conditions,  including expected earnings, growth in earnings, long-term interest
rates and risk  premiums.  When, for example,  this analysis  indicates that the
equity market is overvalued  relative to the fixed income market, the investment
management team would allocate a greater percentage of the Portfolio's assets to
fixed income securities.

When  investing in equity  securities,  the Portfolio  generally  invests in the
equity  securities of a broad mix of companies.  Such  companies  generally will
have market  capitalizations  in excess of $750 million.  Although the Portfolio
primarily  invests in the common  stocks of U.S.  companies,  it may invest to a
limited extent in the stocks of foreign issuers.  Using fundamental research and
quantitative  analysis, the investment management team buys equity securities it
believes  have  favorable  growth  characteristics   relative  to  their  peers.
Similarly, the investment management team sells securities it believes no longer
have  these  characteristics.  The  team may also  sell  securities  in order to
maintain  the  desired  equity  securities  composition  of  the  Portfolio.  In
determining  whether  a  company  has  favorable  growth  characteristics,   the
investment management team analyzes factors such as:

               Sales and earnings growth
               Return on equity
               Debt to equity ratio
               Market share and competitive leadership of the company's products

In buying and selling  securities for the fixed income portion of the Portfolio,
the investment  management  team uses a relative value  approach.  This approach
involves an analysis of general economic and market conditions. It also involves
the use of models that analyze and compare  expected  returns and assumed risks.
Under the relative value approach, the investment management team will emphasize
particular  securities  and  types  of  securities  (such as  treasury,  agency,
mortgage-related and corporate securities) that the team believes will provide a
favorable  return in light of these risks.  In this regard,  the management team
will  consider  not  only  the  income  the  Portfolio  will  receive  from  its
investments,  but also the  likelihood  that  particular  securities or types of
securities will have a more favorable or improving credit outlook.



<PAGE>


The Portfolio invests in a broad range of fixed income securities, including:

     Obligations of the U.S. government,  its agencies or instrumentalities  and
repurchase agreements  collateralized by such obligations  Obligations of state,
local and foreign  governments  Obligations  of domestic  and foreign  banks and
corporations Zero coupon bonds,  debentures and convertible  debentures Mortgage
and other asset-backed  securities Stripped securities  evidencing  ownership of
future interest or principal payments on debt obligations

Although the Portfolio  primarily  invests in domestic fixed income  obligations
that are investment  grade (i.e.,  obligations  rated within the top four rating
categories by a Nationally Recognized  Statistical Rating Organization),  it may
invest to a limited extent in fixed income obligations of foreign issuers and in
securities that are rated below investment grade ("junk bonds").

The  dollar-weighted  average  maturity  of  the  fixed  income  portion  of the
Portfolio will, under normal market conditions, range between two and ten years.

The Portfolio may make  significant  investments in structured debt  securities,
which  are  derivative  instruments,   in  seeking  to  achieve  its  investment
objective.  The  Portfolio  may also  invest,  to a lesser  extent,  in  futures
contracts, options and swaps for both hedging and non-hedging purposes.

Risks.  These  primary  investment  risks  apply  to  the  Portfolio:   interest
rate/maturity,  credit  (or  default),  prepayment  (or call),  debt  extension,
government  securities,  derivatives,  currency,  country,  foreign  regulatory,
high-yield and stock risks. See page __ for these risks and primary risks common
to all Portfolios.

Equity Index Portfolio

Investment Objective

The Portfolio seeks to provide  investment  results  approximating the aggregate
price and  dividend  performance  of the  securities  included in the Standard &
Poor's ("S&P") 500 Composite Stock Price Index ("S&P 500(R) Index").

The S&P  500(R)  Index  is an  unmanaged  index  which  includes  500  companies
operating  across a broad spectrum of the U.S.  economy,  and its performance is
widely considered representative of the U.S. stock market as a whole.

The  companies  chosen for  inclusion  in the Index tend to be industry  leaders
within the U.S. economy as determined by Standard & Poor's.  However,  companies
are not selected by S&P for inclusion because they are expected to have superior
stock price  performance  relative  to the market in general or other  stocks in
particular. As of November 30, 1999, the approximate market capitalization range
of  companies  included in the S&P 500 Index was between $395 million and $464.7
billion.

S&P does not endorse  any stock in the Index.  It is not a sponsor of the Equity
Index Portfolio and is not affiliated with the Portfolio in any way.



<PAGE>


Principal Investment Strategies and Risks

Investment Strategies. Under normal market conditions, the Portfolio will invest
substantially all (at least 80%) of its total assets in the equity securities of
the companies that make up the S&P 500(R) Index, in weightings that  approximate
the relative composition of the securities contained in the Index.

The  Portfolio  is  passively  managed,  which means it tries to  duplicate  the
investment  composition  and  performance of the S&P 500(R) Index using computer
programs and statistical procedures. As a result, the investment management team
does  not  use  traditional  methods  of fund  investment  management  for  this
Portfolio, such as selecting securities on the basis of economic,  financial and
market  analysis.  Rather,  the  investment  management  team  will buy and sell
securities in response to changes in the Index.  Because the Portfolio will have
fees and transaction  expenses (while the Index has none), returns are likely to
be below those of the Index.

Under normal market conditions, it is expected that the quarterly performance of
the Portfolio,  before  expenses,  will track the  performance of the S&P 500(R)
Index within a .95 correlation coefficient.

     Risks.  These primary  investment  risks apply to the Portfolio:  stock and
tracking  risk.  See page __ for these  risks and  primary  risks  common to all
Portfolios.

Diversified Growth Portfolio

Investment Objective

The Portfolio  seeks to provide  long-term  capital  appreciation  with income a
secondary consideration.

Principal Investment Strategies and Risks

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will, under normal market conditions, invest at least 65% of its total assets in
the equity securities of a broad mix of companies. Such companies generally will
have market  capitalizations  in excess of $750 million.  Although the Portfolio
primarily  invests in the common  stocks of U.S.  companies,  it may invest to a
limited extent in the stocks of foreign issuers.

Using fundamental research and quantitative  analysis, the investment management
team buys securities it believes have favorable growth characteristics  relative
to their peers.  Similarly,  the investment  management team sells securities it
believes no longer have these characteristics. The team may also sell securities
in order  to  maintain  the  desired  portfolio  securities  composition  of the
Portfolio,  which may change in response to market  conditions.  In  determining
whether  a  company  has  favorable  growth   characteristics,   the  investment
management team analyzes factors such as:

               Sales and earnings growth
               Return on equity
               Debt to equity ratio
               Market share and competitive leadership of the company's products

     Risks.  These  primary  investment  risks  apply to the  Portfolio:  stock,
currency,  country and foreign regulatory risks. See page __ for these risks and
primary risks common to all Portfolios.



<PAGE>


Focused Growth Portfolio

Investment Objective

The  Portfolio  seeks to  provide  long-term  capital  appreciation.  Any income
received is incidental to this objective.

Primary Investment Strategies and Risks

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will, under normal market conditions, invest at least 65% of its total assets in
the equity  securities of a somewhat smaller number of companies (as compared to
the Diversified Growth Portfolio) that are selected by the investment  mangement
team for their  growth  potential.  Such  companies  generally  will have market
capitalizations  in excess of $750  million.  Although the  Portfolio  primarily
invests  in the  common  stocks of U.S.  companies,  it may  invest to a limited
extent in the securities of foreign issuers.

Using fundamental research and quantitative  analysis, the investment management
team buys securities it believes have favorable growth characteristics  relative
to their peers.  Similarly,  the investment  management team sells securities it
believes no longer have these characteristics. The team may also sell securities
in order  to  maintain  the  desired  portfolio  securities  composition  of the
Portfolio.   In   determining   whether   a   company   has   favorable   growth
characteristics, the investment management team analyze factors such as:

               Sales and earnings growth
               Return on equity
               Debt to equity ratio
               Market share and competitive leadership of the company's products

The Portfolio may, from time to time,  emphasize  particular companies or market
segments, such as technology, in attempting to achieve its investment objective.
Many of the companies in which the Portfolio  invests  retain their  earnings to
finance current and future growth.  These  companies  generally pay little or no
dividends.

     Risks.  These  primary  investment  risks  apply to the  Portfolio:  stock,
technology stock,  currency,  country and foreign  regulatory risks. See page __
for these risks and primary risks common to all Portfolios.

MarketCommand Portfolio

Investment Objective

The  Portfolio  seeks to  provide  long-term  capital  appreciation.  Any income
received is incidental to this objective.

Principal Investment Strategies and Risks

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will, under normal market conditions,  invest primarily (and at least 65% of its
total assets) in the equity  securities of a focused group of companies that the
investment  management team believes have significant "market command," that is,
companies possessing dominant market share and other characteristics,  including
patents,  strong brand names and economies of scale, which allow these companies
to protect that share.  The Portfolio will normally focus its investments in the
equity  securities  of 20 to 40 such  companies  with market  capitalization  in
excess of $300 million.



<PAGE>


Using fundamental research and quantitative  analysis, the investment management
team first screens a broad universe of companies in order to identify a group of
firms with "market  command"  characteristics.  From this group,  the management
team then employs  further  quantitative  analysis to select a narrower group of
companies expected to achieve superior returns (based on an analysis of expected
earnings)  but whose stock is deemed to be  undervalued  relative to the market.
Once a company's stock is selected for inclusion, the investment management team
monitors its continued  appropriateness  for the Portfolio.  The management team
might decide to sell,  for example,  when a company  shifts its emphasis  from a
traditional  core  business  (from which the majority of profits are derived) to
another  business,  or  experiences an erosion of its market command or when the
management  team  identifies  a  more  attractive   investment   opportunity  or
determines that a company's full value has been achieved.

Although the Portfolio invests primarily in the securities of U.S. companies, it
may invest to a limited extent in the stock of foreign issuers. The Portfolio is
"non-diversified"  under the 1940 Act and may invest more of its assets in fewer
issuers than "diversified" mutual funds.

The  investment  management  team may  engage  in active  trading,  and will not
consider  portfolio  turnover  a  limiting  factor in making  decisions  for the
Portfolio.

     Risks. These primary investment risks apply to the Portfolio:  stock, small
company  stock,  portfolio  turnover,  currency,  country,  foreign  regulatory,
technology  and  non-diversification  risks.  See page __ for  these  risks  and
primary risks common to all Portfolios.

Mid Cap Growth Portfolio

Investment Objective

The  Portfolio  seeks to  provide  long-term  capital  appreciation.  Any income
received is incidental to this objective.

Principal Investment Strategies and Risks

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will invest, under normal market conditions, at least 65% of its total assets in
the equity securities of companies with market  capitalizations,  at the time of
purchase,  that are within the range of the  Standard & Poor's  MidCap 400 Stock
Index.

Using fundamental research and quantitative  analysis, the investment management
team buys  securities of mid-sized  companies  that it believes  have  favorable
characteristics  such as above average sales,  earnings  growth and  competitive
returns on equity relative to their peers. Similarly,  the investment management
team sells  securities  it  believes  no longer  have  these or other  favorable
characteristics.  The team may also sell  securities  in order to  maintain  the
desired  portfolio  securities  composition of the  Portfolio.  In doing so, the
investment management team considers factors such as a company's:

     Financial  condition  (such  as debt to  equity  ratio)  Market  share  and
competitive  leadership of the company's  products  Earnings  growth relative to
relevant  competitors  Market  valuation in  comparison  to  securities of other
companies and the stock's own historical norms

As of November 30, 1999,  the  approximate  market  capitalization  range of the
companies  included in the S&P MidCap 400 Index was between  $195.0  million and
$23.4 billion.  However,  the Portfolio is not limited to the stocks included in
the S&P MidCap 400 Index and may invest in other stocks that meet the Investment
Adviser's criteria discussed above.

S&P does not endorse any stock in the Index.  It is not a sponsor of the Mid Cap
Growth Portfolio and is not affiliated with the Portfolio in any way.

     Although the Portfolio  primarily invests in the stocks of U.S.  companies,
it may invest to a limited extent in the securities of foreign issuers.

The  investment  management  team may  engage  in active  trading,  and will not
consider  portfolio  turnover  a  limiting  factor in making  decisions  for the
Portfolio.

     Risks.  These primary  investment risks apply to the Portfolio:  stock, mid
cap stock, currency,  country,  foreign regulatory and portfolio turnover risks.
See page __ for these risks and primary risks common to all Portfolios.

Small Company Index Portfolio

Investment Objective

The Portfolio seeks to provide  investment  results  approximating the aggregate
price and dividend  performance of the  securities  included in the Russell 2000
Index.

The Russell 2000 Index is a market value-weighted index which includes stocks of
the smallest 2,000  companies in the Russell 3000 Index.  The Russell 3000 Index
includes  stocks of the 3,000  largest  companies  based in the U.S. The Russell
2000  Index  is  widely  considered  representative  of  smaller  company  stock
performance  as a whole.  The  companies  in the Russell 2000 Index are selected
according  to their total  market  capitalization.  However,  companies  are not
selected  by Frank  Russell & Company  ("Russell")  for  inclusion  in the Index
because they are expected to have superior stock price  performance  relative to
the stock  market in general or other stocks in  particular.  As of November 30,
1999, the approximate market  capitalization  range of the companies included in
the Russell 2000 Index was between $2.7 million and $6.0 billion.

Russell  does not  endorse  any stock in the  Index.  It is not a sponsor of the
Small Company Index  Portfolio and is not  affiliated  with the Portfolio in any
way.

Primary Investment Strategies and Risks

Investment Strategies. Under normal market conditions, the Portfolio will invest
substantially  all (at least 80%) of its total  assets in the equity  securities
included in the Russell 2000 Index, in weightings that  approximate the relative
composition of securities contained in the Index.

The  Portfolio  is  passively  managed,  which means it tries to  duplicate  the
investment  composition  and  performance  of the  Russell  2000  Index by using
sophisticated  computer programs and statistical  procedures.  As a result,  the
investment  management team does not use traditional  methods of fund investment
management  for the  Portfolio,  such as  selecting  securities  on the basis of
economic,  financial and market analysis. Rather, the investment management team
will buy and sell  securities  in response to changes in the Index.  Because the
Portfolio will have fees and  transaction  expenses  (while the Index has none),
returns are likely to be below those of the Index.

Under normal market conditions, it is expected that the quarterly performance of
the Portfolio,  before expenses,  will track the performance of the Russell 2000
Index within a .95 correlation coefficient.

     Risks.  These  primary  investment  risks  apply to the  Portfolio:  stock,
tracking and small company stock risks.  See page __ for these risks and primary
risks common to all Portfolios.



<PAGE>


Small Company Growth Portfolio

Investment Objective

The  Portfolio  seeks to  provide  long-term  capital  appreciation.  Any income
received is incidental to this objective.

Principal Investment Strategies and Risks

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will invest, under normal market conditions, at least 65% of its total assets in
the equity securities of companies with market  capitalizations that are, at the
time of purchase, within the range of the Russell 2000 Index.

Using fundamental research and quantitative  analysis, the investment management
team  buys  securities  of  small  companies  that it  believes  have  favorable
characteristics  such as above average sales and earnings growth and competitive
returns on equity relative to their peers. Similarly,  the investment management
team sells  securities  it  believes  no longer  have  these or other  favorable
characteristics.  The team may also sell  securities  in order to  maintain  the
desired  portfolio  securities  composition of the  Portfolio.  In doing so, the
investment management team considers factors such as a company's:

          o Financial  condition (such as debt to equity ratio);  o Market share
          and  competitive  leadership  of the  company's  products;  o Earnings
          growth relative to relevant competitors;
          o   Market  valuation in  comparison  to securities of other small cap
              companies and the stock's own historical norms.

As of November 30, 1999,  the  approximate  market  capitalization  range of the
companies  included in the Russell  2000 Index was between $2.7 million and $6.0
billion.  The  Portfolio,  however,  is not limited to the stocks in the Russell
2000 Index,  and may invest in other stocks that meet the  Investment  Adviser's
criteria discussed above.

Russell  does not  endorse  any stock in the  Index.  It is not a sponsor of the
Small Company Growth  Portfolio and is not affiliated  with the Portfolio in any
way.

     Although the Portfolio  primarily invests in the stocks of U.S.  companies,
it may invest to a limited extent in the securities of foreign issuers.

The  investment  management  team may  engage  in active  trading,  and will not
consider  portfolio  turnover  a  limiting  factor in making  decisions  for the
Portfolio.

     Risks. These primary investment risks apply to the Portfolio:  stock, small
company stock,  currency,  country,  foreign  regulatory and portfolio  turnover
risks. See page __ for these risks and primary risks common to all Portfolios.



<PAGE>


International Equity Index Portfolio

Investment Objective

The Portfolio seeks to provide  investment  results  approximating the aggregate
price and dividend  performance of the securities in the Morgan Stanley  Capital
International Europe, Australia and Far East Index ("EAFE Index").

The EAFE  Index is a  broad-based  market  capitalization  weighted  index  that
includes more than 1,000  securities in twenty foreign  countries.  It is widely
considered representative of foreign stock market performance overall.

Morgan  Stanley  Capital  International  ("MSCI")  does not  endorse  any of the
securities in the Index. It is not a sponsor of the  International  Equity Index
Portfolio and is not affiliated with the Portfolio in any way.

Principal Investment Strategies and Risks

Investment Strategies. Under normal market conditions, the Portfolio will invest
substantially  all (at least 80%) of its total  assets in the equity  securities
included  in the  EAFE  Index,  in  weightings  that  approximate  the  relative
composition of the securities contained in the Index.

The  Portfolio  is  passively  managed,  which means it tries to  duplicate  the
investment  composition and performance of the EAFE Index by using sophisticated
computer  programs  and  statistical  procedures.  As a result,  the  investment
management team does not use traditional  methods of fund investment  management
for the  Portfolio,  such as  selecting  securities  on the  basis of  economic,
financial and market analysis.  Rather, the investment  management team will buy
and sell  securities in response to changes in the Index.  Because the Portfolio
will have fees and transaction  expenses (while the Index has none), returns are
likely to be below those of the Index.

Because the proportion of assets  allocated to each country will approximate the
relative  country  weights in the EAFE Index,  more than 25% of the  Portfolio's
assets may be  invested  in a single  country  (such as the United  Kingdom  and
Japan).  This may make  the  Portfolio's  performance  more  dependent  upon the
performance of a single country than if the Portfolio allocated its assets among
issuers in a larger number of countries.

Under normal market conditions, it is expected that the quarterly performance of
the Portfolio,  before  expenses,  will track the  performance of the EAFE Index
within a .95 correlation coefficient.

     Risks.  These  primary  investment  risks  apply to the  Portfolio:  stock,
tracking,  currency, country and foreign regulatory risks. See page __ for these
risks and primary risks common to all Portfolios.



<PAGE>


International Growth Portfolio

Investment Objective

The  Portfolio  seeks to  provide  long-term  capital  appreciation.  Any income
received is incidental to this objective.

Principal Investment Strategies and Risks

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will, under normal market conditions, invest at least 65% of its total assets in
the  equity  securities  of a broad mix of  foreign  companies.  Such  companies
generally will have market capitalizations in excess of $750 million.

Using fundamental research and quantitative  analysis, the investment management
team buys  securities of foreign  companies  that it believes to have  favorable
growth  characteristics  relative  to their  peers.  Similarly,  the  investment
management   team  sells   securities   it   believes   no  longer   have  these
characteristics.  The team may also sell  securities  in order to  maintain  the
desired  portfolio  securities  composition  of the  Portfolio.  In  determining
whether  a  company  has  favorable  growth   characteristics,   the  investment
management team analyzes factors such as:

               Sales and earnings growth
               Return on equity
               Debt to equity ratio
               Market share and competitive leadership of the company's products

The Portfolio  will invest in the common,  preferred and  convertible  stocks of
issuers located in at least three different foreign countries. The Portfolio may
invest in mature  markets  (such as Germany  and  Japan) as well as in  emerging
markets (such as Argentina  and China).  In  determining  whether to invest in a
particular country or region,  the investment  management team looks at a number
of factors, including a country's (or region's):

               Prospects for economic growth
               Expected level of inflation
               Government policies influencing business conditions
               Outlook for currency relationships

The  investment  management  team may  engage  in active  trading,  and will not
consider  portfolio  turnover  a  limiting  factor in making  decisions  for the
Portfolio.

     Risks.  These  primary  investment  risks  apply to the  Portfolio:  stock,
currency,  country, foreign regulatory,  emerging markets and portfolio turnover
risks. See page __ for these risks and primary risks common to all Portfolios.

Principal Investment Risks

All  investments  carry some  degree of risk  which  will  affect the value of a
Portfolio's investments, its investment performance and the price of its shares.
As a result, loss of money is a risk of investing in each Portfolio.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.

The following  summarizes  the principal  risks that apply to the Portfolios and
may result in a loss of your investment.



<PAGE>


Risks that apply to ALL Portfolios:

     Market risk is the  risk  that  the  value  of the  securities  in  which a
          Portfolio  invests may go up or down in response to the  prospects  of
          individual companies and/or general economic conditions. Price changes
          may be temporary or last for extended periods.

     Management  risk  is  the  risk  that a  strategy  used  by the  investment
          management team may fail to produce the intended results.

     Liquidity  risk  is the  risk  that a  Portfolio  will  not be  able to pay
          redemption   proceeds  within  the  time  periods  described  in  this
          Prospectus,  because of unusual market  conditions,  an unusually high
          volume of redemption requests or other reasons.

     [Year2000 risk is the risk that a  Portfolio's  operations or value will be
          adversely  affected  by the "Year 2000  Problem."  This risk may be of
          greater significance with respect to a Portfolio's  investments in the
          securities of foreign issuers. (For more information, please see "Year
          2000 Issues" on page __.)]

Risks that apply primarily to the Fixed Income and Balanced Portfolios:

     Interest  rate/maturity  risk is the  risk  that  increases  in  prevailing
          interest rates will cause fixed income  securities held by a Portfolio
          to decline  in value.  The  magnitude  of this  decline  will often be
          greater for  longer-term  fixed income  securities  than  shorter-term
          securities.

     Credit (or  default)  risk is the  risk  that an  issuer  of  fixed  income
          securities  held by a Portfolio  may default on its  obligation to pay
          interest and repay principal.  Generally,  the lower the credit rating
          of a security,  the  greater the risk that the issuer of the  security
          will default on its obligation.  Investment  grade bonds are generally
          believed to have relatively low degrees of credit risk.

     Prepayment (or call)  risk is the risk that an  issuer  will  exercise  its
          right to pay principal on an obligation held by a Portfolio (such as a
          mortgage-backed  security)  earlier  than  expected.  This may  happen
          during  a  period   of   declining   interest   rates.   Under   these
          circumstances,  a Portfolio may be unable to recoup all of its initial
          investment  and will suffer from having to reinvest in lower  yielding
          securities.   The  loss  of  higher   yielding   securities   and  the
          reinvestment  at lower  interest  rates  can  reduce  the  Portfolio's
          income, total return and share price.

     Debt extension  risk is the risk that an issuer will  exercise its right to
          pay  principal  on  an  obligation  held  by a  Portfolio  (such  as a
          mortgage-backed  security) later than expected. This may happen during
          a period of rising  interest  rates.  Under these  circumstances,  the
          value of the  obligation  will decrease and the Portfolio  will suffer
          from the inability to invest in higher yielding securities.

     Derivatives  risk is the risk  that  loss  may  result  from a  Portfolio's
          investments in options, futures, swaps, structured debt securities and
          other derivative instruments,  which may be leveraged.  Investments in
          derivative  instruments  may result in losses  exceeding  the  amounts
          invested.

     Government  securities  risk is the risk that the U.S.  government will not
          provide    financial    support   to   U.S.    government    agencies,
          instrumentalities  or sponsored  enterprises if it is not obligated to
          do so by law.

     Risk that applies to the U.S. Treasury Index,  Equity Index,  Small Company
Index and International Equity Index Portfolios:

     Tracking  risk  is  the  risk  that  a  Portfolio's  performance  may  vary
          substantially from the performance of the benchmark index it tracks as
          a result  of  share  purchases  and  redemptions,  transaction  costs,
          expenses and other factors.

Risk that applies primarily to the Equity and Balanced Portfolios:

     Stockrisk is the risk that stock prices have historically  risen and fallen
          in periodic  cycles.  As of the date of this  Prospectus,  U.S.  stock
          markets and certain  foreign stock markets were trading at or close to
          record  high  levels.  There is no  guarantee  that such  levels  will
          continue.

Risk that applies  primarily to the Small Company Index and Small Company Growth
Portfolios:

     Smallcompany  stock risk is the risk that stocks of smaller  companies  may
          be subject to more abrupt or erratic  market  movements than stocks of
          larger, more established  companies.  Small companies may have limited
          product lines or financial resources, or may be dependent upon a small
          or  inexperienced  management  group.  In  addition,  small cap stocks
          typically are traded in lower volume,  and their issuers typically are
          subject to greater degrees of changes in their earnings and prospects.

Risk that applies primarily to the Focused Growth Portfolio:

     Technology stock risk is the risk that stocks of  technology  companies may
          be subject to greater  price  volatility  than stocks of  companies in
          other  sectors.  Technology  companies  may produce or use products or
          services  that prove  commercially  unsuccessful,  become  obsolete or
          become  adversely  impacted  by  government   regulation.   Technology
          securities  may  experience  significant  price  movements  caused  by
          disproportionate investor optimism or pessimism.

Risk that applies primarily to the Mid Cap Growth Portfolio:

     Mid  cap stock risk is the risk that stocks of mid-sized  companies  may be
          subject to more  abrupt or erratic  market  movements  than  stocks of
          larger,  more  established  companies.  Mid-sized  companies  may have
          limited  product  lines or financial  resources,  and may be dependent
          upon a particular niche of the market.

Risk  that  applies  primarily  to  the  MarketCommand  and  International  Bond
Portfolios:

     Non-diversification  risk is the risk that a non-diversified  portfolio may
          be  more   susceptible  to  adverse   financial,   economic  or  other
          developments  affecting any single  issuer,  and more  susceptible  to
          greater losses because of these developments.

Other Risks:

     High-yield  risk may impact the value of  non-investment  grade  securities
          held by a Portfolio.  Generally, these securities,  sometimes known as
          "junk bonds," are subject to greater credit risk, price volatility and
          risk of loss than investment grade securities.  In addition, there may
          be less of a market for them,  which could make it harder to sell them
          at an acceptable price.  These and related risks mean that a Portfolio
          may  not  achieve  the  expected  income  from  non-investment   grade
          securities  and that its share  price  may be  adversely  affected  by
          declines in the value of these securities.

     Currency risk is the potential for price  fluctuations  in the dollar value
          of foreign securities because of changing currency exchange rates.

     Country risk is the potential for price  fluctuations in foreign securities
          because  of  political,  financial  and  economic  events  in  foreign
          countries.  Investment of more than 25% of a Portfolio's  total assets
          in  securities  of issuers  located in one  country  will  subject the
          Portfolio  to increased  country  risk with respect to the  particular
          country.

     Foreign  regulatory  risk is the risk that a foreign  security  could  lose
          value because of less stringent  foreign  securities  regulations  and
          accounting and disclosure standards.

     Emerging markets risk is the risk that the  securities  markets of emerging
          countries  are less liquid,  are  especially  subject to greater price
          volatility, have smaller market capitalizations,  have less government
          regulation   and  are  not  subject  to  as  extensive   and  frequent
          accounting,   financial  and  other  reporting   requirements  as  the
          securities markets of more developed countries.

     Portfolio turnover risk is the risk that high portfolio  turnover is likely
          to result in increased  Portfolio  expenses  which may result in lower
          investment  returns.  High portfolio turnover is also likely to result
          in higher  short-term  capital gains taxable to shareholders.  For the
          last fiscal  year,  the annual  portfolio  turnover  rates of the U.S.
          Government  Securities  Portfolio and  International  Growth Portfolio
          exceeded 100%. It is expected that the annual portfolio turnover rates
          of the  Small  Company  Growth,  MarketCommand  Portfolio  and Mid Cap
          Growth Portfolios may also exceed 100%.

More information about the Portfolio's  investment  strategies and techniques is
provided in "Risks, Securities and Techniques" beginning on page __.

Portfolio Performance

Each Portfolio is authorized to offer three classes of shares - Class A, Class C
and Class D. The bar charts and tables below  provide an indication of the risks
of  investing  in a Portfolio by showing:  (a) changes in the  performance  of a
Portfolio's  Class A Shares from year to year,  and (b) how the  average  annual
returns of a  Portfolio's  outstanding  classes of shares  compare to those of a
broad-based securities market index.

The bar charts and tables assume reinvestment of dividends and distributions.  A
Portfolio's  past  performance  is not  necessarily  an  indication  of how  the
Portfolio will perform in the future.  Performance  reflects expense limitations
(as set forth in the Footnotes to the Portfolio  Fees and Expenses table on page
38) that were in effect  during the periods  presented.  If expense  limitations
were not in place, a Portfolio's  performance  would have been reduced.  Because
the  operating  expenses of each  Portfolio's  Class A Shares are lower than the
expenses  of its  Class C and  Class D Shares,  the  performance  of the Class A
Shares is higher than the performance of these other share classes.

The bar chart and  performance  table have been  omitted  for the Small  Company
Growth,  Mid Cap Growth and  MarketCommand  Portfolios  because these Portfolios
have been in operation for less than one calendar year.

U.S. Government Securities Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:        -0.71%
                                               1995:        11.84%
                                               1996:         4.14%
                                               1997:         6.76%
                                               1998:         6.93%
                                               1999:         ____%



<PAGE>


Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q2 '95                +3.51%]
Worst Quarter Return:               [Q1 '94                -1.11%]

           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                       <C>                 <C>               <C>

                                                                                                    Since
                                                              1 Year              5 Year            Inception
Class A (Inception 4/5/93)                                    ____%               ____%               ____%
Merrill Lynch 1-5 Government Index*                           ____%               ____%               ____%
- ------------------------------------------------------- ------------------- ------------------- -------------------

Class C (Inception 12/29/95)                                  ____%               N/A                ____%
Merrill Lynch 1-5 Government Index*                           ____%               N/A                ____%
- ------------------------------------------------------- ------------------ ------------------- -------------------

Class D (Inception 9/15/94)                                   ____%              ____%               ____%
Merrill Lynch 1-5 Government Index*                           ____%              ____%               ____%
- ------------------------------------------------------- ------------------ ------------------- -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

Short-Intermediate Bond Portfolio
                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:         0.91%
                                               1995:        12.06%
                                               1996:         4.55%
                                               1997:         6.76%
                                               1998:         7.69%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q2 '95                +3.84%]
Worst Quarter Return:               [Q1 '96                -0.17%]

           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                <C>                 <C>               <C>

                                                                                              Since
                                                        1 Year             5 Year            Inception
Class A (Inception 1/11/93)                             ____%               ____%              ____%
Merrill Lynch 1-5 Corporate/
Government Bond Index*                                  ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 9/14/94)                             ____%               ____%              ____%
Merrill Lynch 1-5 Corporate/
Government Bond Index*                                  ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

Intermediate Bond Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1998:         7.11%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q3 '98                +2.94%]
Worst Quarter Return:               [Q4 '98                +0.26%]


           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                 <C>                 <C>              <C>

                                                                                             Since
                                                        1 Year             5 Year            Inception
Class A (Inception 8/1/97)                              ____%                N/A               ____%
Lehman Brothers Intermediate
Government/Corporate Bond Index*                        ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.


<PAGE>


U.S. Treasury Index Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:        -3.41%
                                               1995:        17.83%
                                               1996:         2.57%
                                               1997:         9.64%
                                               1998:         9.89%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q2 '95                +6.20%]
Worst Quarter Return:               [Q1 '96                -2.37%]


           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                  <C>               <C>              <C>

                                                                                               Since
                                                        1 Year             5 Year            Inception
Class A (Inception 1/11/93)                              ____%              ____%              ____%
Lehman Brothers Treasury Bond Index*
                                                         ----%              ----%              ----%
- -------------------------------------------------- ------------------ ------------------ -------------------

Class D (Inception 11/16/94)                             ____%              ____%              ____%
Lehman Brothers Treasury Bond Index*
                                                         ----%              ----%              ----%
- -------------------------------------------------- ------------------ ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

Bond Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:        -3.84%
                                               1995:        22.70%
                                               1996:         3.39%
                                               1997:        10.00%
                                               1998:         9.29%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q2 '95                +7.66%]
Worst Quarter Return:               [Q1 '96                -2.00%]

            Average Annual Total Return (for the periods ended December 31,
1999)
<TABLE>
<CAPTION>
<S><C>                                                 <C>                <C>               <C>

                                                                                                Since
                                                        1 Year             5 Year            Inception
Class A (Inception 1/11/93)                             ____%               ____%              ____%
Lehman Brothers Government/
Corporate Bond Index*                                   ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class C (Inception 7/3/95)                              ____%                N/A               ____%
Lehman Brothers Government/
Corporate Bond Index*                                   ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 9/14/94)                             ____%               ____%              ____%
Lehman Brothers Government/
Corporate Bond Index*                                   ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

International Bond Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1995:        20.58%
                                               1996:         7.18%
                                               1997:        -3.42%
                                               1998:        15.45%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q1 '95               +10.89%]
Worst Quarter Return:               [Q1 '97                -5.89%]


           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                 <C>                <C>                <C>

                                                                                             Since
                                                        1 Year             5 Year            Inception
Class A (Inception 3/28/94)                             ____%               ____%              ____%
J.P. Morgan Non-U.S. Government
Bond Index*                                             ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 11/20/95)                            ____%                N/A               ____%
J.P. Morgan Non-U.S. Government
Bond Index*                                             ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.


<PAGE>


Balanced Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:        -6.01%
                                               1995:        20.59%
                                               1996:        11.23%
                                               1997:        20.21%
                                               1998:        22.37%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +13.42%]
Worst Quarter Return:               [Q3 '98                -4.69%]

           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                <C>                 <C>              <C>

                                                                                             Since
                                                        1 Year             5 Year            Inception
Class A (Inception 7/1/93)                              ____%               ____%              ____%
Lehman Bros. Intermediate
Government/Corporate Bond Index*                        ____%               ____%              ____%
S&P 500(R)Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class C (Inception 12/29/95)                            ____%                N/A               ____%
Lehman Bros. Intermediate
Government/Corporate Bond Index*                        ____%                N/A               ____%
S&P 500(R)Index*                                         ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 2/20/96)                             ____%                N/A               ____%
Lehman Bros. Intermediate
Government/Corporate Bond Index*                        ____%                N/A               ____%
S&P 500(R)Index*                                         ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.



<PAGE>


Equity Index Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:         1.15%
                                               1995:        37.18%
                                               1996:        22.65%
                                               1997:        32.74%
                                               1998:        28.31%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +21.22%]
Worst Quarter Return:               [Q3 '98                -9.98%]


           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                  <C>                <C>               <C>

                                                                                               Since
                                                        1 Year             5 Year            Inception
Class A (Inception 1/11/93)                             ____%               ____%              ____%
S&P 500(R) Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class C (Inception 9/28/95)                             ____%                N/A               ____%
S&P 500(R) Index*                                         ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 9/14/94)                             ____%               ____%              ____%
S&P 500(R) Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

Diversified Growth Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:        -9.37%
                                               1995:        24.54%
                                               1996:        17.46%
                                               1997:        31.36%
                                               1998:        34.96%
                                               1999:         ____%



<PAGE>


Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +24.51%]
Worst Quarter Return:               [Q3 '98                -9.77%]


           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                 <C>                <C>                <C>

                                                                                                Since
                                                        1 Year             5 Year            Inception
Class A (Inception 1/11/93)                             ____%               ____%              ____%
S&P 500(R) Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 9/14/94)                             ____%               ____%              ____%
S&P 500(R) Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

Focused Growth Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1994:        -6.62%
                                               1995:        23.67%
                                               1996:        14.26%
                                               1997:        33.68%
                                               1998:        36.50%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +27.64%]
Worst Quarter Return:               [Q3 '98               -11.03%]

           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                 <C>                 <C>              <C>

                                                                                            Since
                                                        1 Year             5 Year            Inception
Class A (Inception 7/1/93)                              ____%               ____%              ____%
S&P 500(R) Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class C (Inception 6/14/96)                             ____%                N/A               ____%
S&P 500(R) Index*                                         ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 12/8/94)                             ____%               ____%              ____%
S&P 500(R) Index*                                         ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.

Small Company Index Portfolio
                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)*

                                               1994:        -2.28%
                                               1995:        27.68%
                                               1996:        15.85%
                                               1997:        22.16%
                                               1998:        -2.85%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +16.16%]
Worst Quarter Return:               [Q3 '98               -20.10%]

* The  returns  in the bar chart do not  reflect  the  special  transaction  fee
charged on the purchase of shares.  If they did reflect such fee,  returns would
be less than those shown.

         Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                  <C>              <C>                 <C>

                                                                                              Since
                                                        1 Year             5 Year            Inception
Class A (Inception 1/11/93)                             ____%               ____%              ____%
Russell 2000 Small Stock Index**                        ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 12/8/94)                             ____%               ____%              ____%
Russell 2000 Small Stock Index**                        ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

**  The Index figures do not reflect any fees or expenses.

International Equity Index Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)*


                                               1998:        18.94%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +19.82%]
Worst Quarter Return:               [Q3 '98               -14.10%]

* The return in the bar chart  does not  reflect  the  special  transaction  fee
charged on the purchase of shares.  If it did reflect such fee, the return would
be less than that shown.

           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                  <C>                <C>               <C>

                                                                                             Since
                                                        1 Year             5 Year            Inception
Class A (Inception 4/1/97)                              ____%                N/A               ____%
MSCI EAFE Index**                                       ____%                N/A               ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>



     ** The MSCI EAFE Index is the Morgan Stanley Capital  International Europe,
Australia and Far East Index, an unmanaged index which tracks the performance of
selected  equity  securities in Europe,  Australia,  Asia and the Far East.  The
Index figures do not reflect any fees or expenses.


International Growth Portfolio

                                                    [Bar Chart]

                                       Calendar Year Total Return (Class A)

                                               1995:         2.53%
                                               1996:         5.13%
                                               1997:         6.46%
                                               1998:        24.52%
                                               1999:         ____%

Best and Worst
Quarterly
Performance (for the periods ended December 31, 1999):

Best Quarter Return:                [Q4 '98               +18.99%]
Worst Quarter Return:               [Q3 '98               -13.76%]


           Average Annual Total Return (for the periods ended December 31, 1999)
<TABLE>
<CAPTION>
<S><C>                                                <C>                  <C>                <C>

                                                                                               Since
                                                        1 Year             5 Year            Inception
Class A (Inception 3/28/94)                             ____%               ____%              ____%
MSCI EAFE Index*                                        ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------

Class D (Inception 11/16/94)                            ____%               ____%              ____%
MSCI EAFE Index*                                        ____%               ____%              ____%
- ------------------------------------------------- ------------------- ------------------ -------------------
</TABLE>

*  The Index figures do not reflect any fees or expenses.



<PAGE>


   Broad-Based Securities Market Indices Descriptions



<PAGE>


   Broad-Based Securities Market Indices Descriptions

The Merrill Lynch 1-5 Government  Index is an unmanaged  index of prices of U.S.
Treasury notes with maturities of one to five years.

The Lehman Brothers Intermediate Government/Corporate Bond Index is an unmanaged
index of prices of U.S. government and corporate bonds with remaining maturities
of one to ten years.

The Lehman Brothers  Treasury Bond Index is an unmanaged index of prices of U.S.
Treasury bonds with maturities of one to thirty years.

     The J.P.  Morgan  Non-U.S.  Government  Bond Index is an unmanaged index of
prices of non-U.S. government bonds with maturities of one to thirty years.


The S&P 500(R) Index is the Standard & Poor's  Composite Index of 500 stocks,  a
widely recognized, unmanaged index of common stock prices.

The  Russell  2000 Small  Stock Index is an  unmanaged  index  which  tracks the
performance of the 2,000 smallest of the 3,000 largest U.S. companies,  based on
market capitalization.

The  MSCI  EAFE  Index  is the  Morgan  Stanley  Capital  International  Europe,
Australia and Far East Index, an unmanaged index which tracks the performance of
selected equity securities in Europe, Australia, Asia and the Far East.



<PAGE>


Portfolio Fees and Expenses


This table  describes the fees and expenses that you may pay if you buy and hold
Class A, C or D Shares of the  Portfolios.  Each class of shares  represents pro
rata interests in a Portfolio  except that different  shareholder  servicing and
transfer  agency fees are payable  due to the varying  levels of  administrative
support and transfer  agency services  provided to each class.  Please note that
the following  information  does not reflect any charges which may be imposed by
The  Northern  Trust  Company,  its  affiliates,  correspondent  banks and other
institutions  on their  customers.  (For more  information,  please see "Account
Policies and Other Information" on page __.)

     As indicated below, the Small Company Index and International  Equity Index
Portfolios charge an additional transaction fee on the purchase of shares.

<TABLE>
<CAPTION>
<S>                                                           <C>                             <C>
                                                              U.S. Government Securities      Short-Intermediate Bond
                                                              ------------------------        -----------------------
                                                              Class A Class C Class D         Class A Class C Class D
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                                         <C>     <C>      <C>          <C>      <C>     <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None    None    None          None    None    None
     Additional  Transaction  Fee (as a  percentage  of amount   None    None    None          None    None    None
invested).....................................................
     Deferred Sales Charge (Load).............................   None    None    None          None    None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None    None    None          None    None    None
     Redemption Fees..........................................   None    None    None          None    None    None
     Exchange Fees............................................   None    None    None          None    None    None

Annual Portfolio Operating Expenses
     (expenses that are deducted from Portfolio assets)
     Management Fees1.........................................   .60%   0.60%   0.60%         0.60%   0.60%   0.60%
     Distribution (12b-1) Fees................................   None    None    None          None    None    None
     Other Expenses
         Servicing Fees.......................................   None   0.15%   0.25%          None   0.15%   0.25%
     Transfer Agency Fees.....................................  0.01%   0.10%   0.15%         0.01%   0.10%   0.15%
         Other Operating Expenses2............................  0.16%    0.16%  0.16%         0.15%   0.15%   0.15%

         Total Other Operating Expenses.......................  0.17%   0.41%   0.56%         0.16%   0.40%   0.55%

     Total Annual Portfolio Operating Expenses3...............  0.77%   1.01%   1.16%         0.76%   1.00%   1.15%
</TABLE>


<TABLE>
<CAPTION>
<S>                                                           <C>                           <C>

                                                              Intermediate Bond             U.S. Treasury Index
                                                              ------------------------      ------------------------
                                                              Class A Class C Class D        Class AClass C Class D
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                                          <C>      <C>    <C>           <C>    <C>      <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None    None   None           None   None    None
     Additional  Transaction  Fee (as a  percentage  of amount   None    None   None           None   None    None
invested).....................................................
     Deferred Sales Charge (Load).............................   None    None   None           None   None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None    None   None           None   None    None
     Redemption Fees..........................................   None    None   None           None   None    None
     Exchange Fees............................................   None    None   None           None   None    None

Annual Portfolio Operating Expenses
     (expenses that are deducted from Portfolio assets)
     Management Fees1.........................................   0.60%   0.60%  0.60%          0.40%  0.40%   0.40%
     Distribution (12b-1) Fees................................   None    None   None           None   None    None
     Other Expenses
         Servicing Fees.......................................   None   0.15%  0.25%           None  0.15%   0.25%
     Transfer Agency Fees.....................................   0.01%   0.10%  0.15%          0.01%  0.10%   0.15%
         Other Operating Expenses2............................   0.19%   0.19%  0.19%         0.36%   0.36%  0.36%

         Total Other Operating Expenses.......................   0.20%   0.44%  0.59%         0.37%   0.61%   0.76%

     Total Annual Portfolio Operating Expenses3...............   0.80%   1.04%  1.19%          0.77%  1.01%   1.16%

</TABLE>


<TABLE>
<CAPTION>
<S>                                                          <C>                           <C>
                                                                      Bond                  International Bond
                                                              ------------------------      ------------------------
                                                              Class A Class C Class D       Class A Class C Class D
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                                           <C>     <C>     <C>           <C>     <C>     <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None    None    None          None    None    None
     Additional Transaction Fee (as a percentage of amount       None    None    None          None    None    None
invested).....................................................
     Deferred Sales Charge (Load).............................   None    None    None          None    None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None    None    None          None    None    None
     Redemption Fees..........................................   None    None    None          None    None    None
     Exchange Fees............................................   None    None    None          None    None    None



Annual Portfolio Operating Expenses
(expenses that are deducted from Portfolio assets)
     Management Fees1.........................................  0.60%   0.60%   0.60%         0.90%   0.90%   0.90%
     Distribution (12b-1) Fees................................  None    None    None          None    None    None
     Other Expenses
         Servicing Fees.......................................  None   0.15%    0.25%         None    0.15%   0.25%
         Transfer Agency Fees.................................  0.01%   0.10%   0.15%         0.01%   0.10%   0.15%
         Other Operating Expenses2............................  0.13%   0.13%   0.13%         0.54%   0.54%   0.54%

         Total Other Operating Expenses.......................  0.14%   0.38%   0.53%         0.55%   0.79%   0.94%

     Total Annual Portfolio Operating Expenses3...............  0.74%   0.98%   1.13%         1.44%   1.68%   1.83%
</TABLE>



<TABLE>
<CAPTION>
<S>                                                            <C>                         <C>

                                                                     Balanced                       Equity Index
                                                               -----------------------      ------------------------
                                                               Class A Class C Class D        Class A Class C   Class D
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                                           <C>     <C>    <C>            <C>    <C>     <C>

 Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None    None   None           None   None    None
     Additional Transaction Fee (as a percentage of amount       None    None   None           None   None    None
invested).....................................................
     Deferred Sales Charge (Load).............................   None    None   None           None   None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None    None   None           None   None    None
     Redemption Fees..........................................   None    None   None           None   None    None
     Exchange Fees............................................   None    None   None           None   None    None

<PAGE>



Annual Portfolio Operating Expenses
(expenses that are deducted from Portfolio assets)
     Management Fees1.........................................   0.80%   0.80%  0.80%          0.30%  0.30%   0.30%
     Distribution (12b-1) Fees................................   None    None   None           None   None    None
     Other Expenses
         Servicing Fees.......................................   None   0.15%  0.25%           None  0.15%   0.25%
         Transfer Agency Fees.................................   0.01%   0.10%  0.15%          0.01%  0.10%   0.15%
         Other Operating Expenses2............................   0.18%  0.18%   0.18%          0.13%  0.13%   0.13%

         Total Other Operating Expenses.......................  0.19%    0.43%  0.58%          0.14%  0.38%   0.53%

     Total Annual Portfolio Operating Expenses3...............  0.99%   1.23%  1.38%          0.44%  0.68%   0.83%
</TABLE>


<TABLE>
<CAPTION>
<S>                                                          <C>                           <C>

                                                               Diversified Growth           Focused Growth
                                                              -----------------------      ------------------------
                                                              Class A  Class C Class D      Class A  Class C Class D
                                                               Shares Shares  Shares         Shares  Shares  Shares
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                                          <C>     <C>     <C>            <C>     <C>    <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None   None    None           None    None   None
     Additional Transaction Fee (as a percentage of amount       None   None    None           None    None   None
invested).....................................................
     Deferred Sales Charge (Load).............................   None   None    None           None    None   None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None   None    None           None    None   None
     Redemption Fees..........................................   None   None    None           None    None   None
     Exchange Fees............................................   None   None    None           None    None   None

Annual Portfolio Operating Expenses
(expenses that are deducted from Portfolio assets)
     Management Fees1.........................................  0.80%  0.80%   0.80%          1.10%   1.10%  1.10%
     Distribution (12b-1) Fees................................   None   None    None           None    None   None
     Other Expenses
         Servicing Fees.......................................   None  0.15%   0.25%           None   0.15%  0.25%
         Transfer Agency Fees.................................  0.01%  0.10%   0.15%          0.01%   0.10%  0.15%
         Other Operating Expenses2............................ 0.15% 0.15%    0.15%          0.15%   0.15%  0.15%

         Total Other Operating Expenses....................... 0.16%    0.40%  0.55%          0.16%   0.40%  0.55%

     Total Annual Portfolio Operating Expenses3...............  0.96%   1.20%  1.35%          1.25%   1.50%  1.65%
</TABLE>

<TABLE>
<CAPTION>
<S>                                                          <C>                          <C>



                                                                 MarketCommand               Mid Cap Growth
                                                              -----------------------       -----------------------
                                                               Class A  Class C Class D       Class A Clas C  Class D
                                                               Shares   Shares  Shares         Shares  Shares  Shares
</TABLE>

<TABLE>
<CAPTION><S><C>                                                 <C>   <C>    <C>            <C>    <C>     <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None   None   None           None   None    None
     Additional Transaction Fee (as a percentage of amount       0.50%  0.50%  0.50%          None   None    None
invested).....................................................
     Deferred Sales Charge (Load).............................   None   None   None           None   None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None   None   None           None   None    None
     Redemption Fees..........................................   None   None   None           None   None    None
     Exchange Fees............................................   None   None   None           None   None    None

Annual Portfolio Operating Expenses
(expenses that are deducted from Portfolio assets)
     Management Fees1.........................................   1.10%  1.10%  1.10%          1.10%  1.10%   1.10%
     Distribution (12b-1) Fees................................   None   None   None           None   None    None
     Other Expenses
         Servicing Fees.......................................   None  0.15%  0.25%           None   0.15%   0.25%
         Transfer Agency Fees.................................   0.01%  0.10%  0.15%          0.01%  0.10%   0.15%
         Other Operating Expenses2............................   0.57%  0.57%  0.57%          0.57%  0.57%   0.57%

         Total Other Operating Expenses.......................   0.60%   0.84%  0.97%         0.60%   0.84%   0.97%

     Total Annual Portfolio Operating Expenses3...............   1.68%  1.92%  2.07%          1.68%  1.92%   2.07%

</TABLE>


<TABLE>
<CAPTION>
<S>                                                           <C>                          <C>


                                                                 Small Company Index          Small Company Growth
                                                              -----------------------      -------------------------
                                                              Class A Class C Class D        Class A Class C Class D
                                                               Shares  Shares Shares         Shares  Shares  Shares
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                                         <C>     <C>     <C>            <C>     <C>      <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................   None    None   None           None    None    None
     Additional Transaction Fee (as a percentage of amount       0.50%   0.50%  0.50%           None    None    None
invested).....................................................
     Deferred Sales Charge (Load).............................   None    None   None           None    None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..   None    None   None           None    None    None
     Redemption Fees..........................................   None    None   None           None    None    None
     Exchange Fees............................................   None    None   None           None    None    None


<PAGE>

Annual Portfolio Operating Expenses
 (expenses that are deducted from Portfolio assets)
     Management Fees1.........................................  0.40%   0.40%  0.40%          1.10%   1.10%   1.10%
     Distribution (12b-1) Fees................................  None    None   None           None    None    None
     Other Expenses
         Servicing Fees.......................................  None   0.15%   0.25%           None   0.15%   0.25%
         Transfer Agency Fees.................................  0.01%   0.10%  0.15%           0.01%   0.10%   0.15%
         Other Operating Expenses2............................  0.40%  0.40%   0.40%           0.18%   0.18%   0.18%

         Total Other Operating Expenses.......................  0.41%   0.65%  0.80%          0.19%   0.43%   0.58%

     Total Annual Portfolio Operating Expenses3...............  0.81%   1.05%  1.20%          1.29%   1.53%   1.68%

</TABLE>

<TABLE>
<CAPTION><S>                                                          <C>                          <C>



                                                              International Equity Index      International Growth
                                                              -----------------------      -------------------------
                                                               Class A Class C Class D       Class A Class C Class D
                                                               Shares  Shares  Shares        Shares Shares  Shares
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                                         <C>    <C>      <C>           <C>    <C>      <C>

Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases.................  None    None    None          None   None    None
     Additional Transaction Fee (as a percentage of amount      1.00%   1.00%   1.00%         None   None    None
invested).....................................................
     Deferred Sales Charge (Load).............................  None    None    None          None   None    None
     Sales Charge (Load) Imposed on Reinvested Distributions..  None    None    None          None   None    None
     Redemption Fees..........................................  None    None    None          None   None    None
     Exchange Fees............................................  None    None    None          None   None    None

Annual Portfolio Operating Expenses
 (expenses that are deducted from Portfolio assets)
     Management Fees1.........................................  0.50%   0.50%   0.50%         1.00%  1.00%   1.00%
     Distribution (12b-1) Fees................................  None    None    None          None   None    None
     Other Expenses
         Servicing Fees.......................................  None    0.15%   0.25%         None   0.15%   0.25%
         Transfer Agency Fees.................................  0.01%   0.10%   0.15%         0.01%  0.10%   0.15%
         Other Operating Expenses2............................  0.40%   0.40%   0.40%         0.30%  0.30%   0.30%

         Total Other Operating Expenses.......................  0.41%   0.65%   0.80%         0.31%  0.55%   0.70%

     Total Annual Portfolio Operating Expenses3...............  0.91%   1.15%   1.30%         1.31%  1.55%   1.70%

</TABLE>



                  .........


1        For the fiscal year ended November 30, 1999, The Northern Trust Company
         and Northern  Trust  Quantitative  Advisors,  Inc.  (collectively,  the
         "Investment Advisers") voluntarily waived a portion of their management
         fees. As a result of the fee waiver, actual management fees paid by the
         U.S. Government Securities, Short-Intermediate Bond, Intermediate Bond,
         U.S. Treasury Index, Bond, International Bond, Balanced,  Equity Index,
         Diversified Growth, Focused Growth, Small Company Index,  International
         Equity Index and  International  Growth  Portfolios were 0.25%,  0.25%,
         0.25%,  0.15%,  0.25%,  0.70%, 0.50%, 0.10%, 0.55%, 0.80%, 0.20%, 0.25%
         and 0.80%,  respectively,  of the Portfolios' average daily net assets.
         As of the date of this  Prospectus,  The Northern Trust Company intends
         to  waive   voluntarily  a  portion  of  its  management  fee  for  the
         MarketCommand,  Mid Cap Growth and Small Company  Growth  Portfolios so
         that the actual management fees paid by these Portfolios will be 0.80%,
         0.80% and 0.80% respectively,  for the current fiscal year. Fee waivers
         may be terminated at any time at the option of the Investment Advisers.

2        "Other Operating Expenses" include  administration or co-administration
         fees and all other  ordinary  operating  expenses of the Portfolios not
         listed  above.  For the period from  December 1, 1998 through April 30,
         1999,  Goldman,  Sachs  & Co.  ("Goldman  Sachs")  was  entitled  to an
         administration  fee at an annual rate of 0.15% of the average daily net
         assets of each of the International Equity Index,  International Growth
         and International  Bond Portfolios,  and 0.10% of the average daily net
         assets of each other  Portfolio that had commenced  operations.  During
         the  same  period,   Goldman  Sachs  reimbursed   expenses   (including
         administration fees, but excluding management and transfer agency fees,
         servicing fees and certain extraordinary expenses) which exceeded on an
         annualized basis 0.25% of the International Equity Index, International
         Growth and International Bond Portfolios' average daily net assets, and
         0.10% of each other  Portfolio's  average daily net assets. As a result
         of the expense  reimbursement,  actual other operating expenses paid by
         the U.S. Government Securities,  Short-Intermediate  Bond, Intermediate
         Bond, U.S. Treasury Index, Bond,  International Bond, Balanced,  Equity
         Index,   Diversified  Growth,  Focused  Growth,  Small  Company  Index,
         International  Equity Index and  International  Growth  Portfolios were
         0.10%,  0.10%,  0.10%, 0.10%, 0.10%, 0.25%, 0.10%, 0.10%, 0.10%, 0.11%,
         0.10%, 0.29% and 0.25%, respectively,  of the Portfolios' average daily
         net assets. On May 1, 1999, The Northern Trust Company ("Northern") and
         PFPC Inc.,  formerly First Data Investor  Services Group, Inc. ("PFPC")
         replaced  Goldman Sachs as the Portfolios'  co-administrators,  and are
         entitled to a  co-administration  fee from the Portfolios at the annual
         rates set forth above. Under the  Co-Administration  Agreement with the
         Trust,  which  may  be  amended  without  shareholder   approval,   the
         co-administrators   have  agreed  indefinitely  to  reimburse  expenses
         (including fees payable to Northern and PFPC as co-administrators,  but
         excluding  management  fees,  transfer agency fees,  servicing fees and
         extraordinary  expenses)  which exceed on an annualized  basis 0.25% of
         the International Equity Index,  International Growth and International
         Bond  Portfolios'  average  daily net  assets,  and 0.10% of each other
         Portfolio's average daily net assets. The MarketCommand, Mid Cap Growth
         and  Small  Company  Growth  Portfolios  did  not  conduct   investment
         operations during the fiscal year ended November 30, 1999. As a result,
         "Other Operating  Expenses" for those Portfolios are based on estimated
         amounts the Portfolios expect to pay during the current fiscal year.

3        Set forth below are the  management  fees,  distribution  (12b-1) fees,
         other expenses and total annual operating  expenses  actually paid (for
         share classes that were outstanding) or which would have been paid (for
         share classes that were not  outstanding)  during the fiscal year ended
         November   30,   1999  as  a  result  of  fee   waivers   and   expense
         reimbursements.



<PAGE>




<TABLE>
<CAPTION>
<S><C>                           <C>                          <C>                        <C>                        <C>

Portfolio                        Management                  Distribution                Other Expenses            Total Annual
                                 Fees                       (12b-1) Fees                                           Operating
                                                                                                                   Expenses
- --------------------------------------------- ---------------------------- ---------------------------- ---------------------------
U.S. Government Securities
         Class A                 0.25%                        0.00%                        0.11%                        0.36%
         Class C                 0.25%                        0.00%                        0.35%                        0.60%
         Class D                 0.25%                        0.00%                        0.50%                        0.75%
Short-Intermediate Bond
         Class A                 0.25%                        0.00%                        0.11%                        0.36%
         Class C                 0.25%                        0.00%                        0.35%                        0.60%
         Class D                 0.25%                        0.00%                        0.50%                        0.75%
Intermediate Bond
         Class A                 0.25%                        0.00%                        0.11%                        0.36%
         Class C                 0.25%                        0.00%                        0.35%                        0.60%
         Class D                 0.25%                        0.00%                        0.50%                        0.75%
U.S. Treasury Index
         Class A                 0.15%                        0.00%                        0.11%                        0.26%
         Class C                 0.15%                        0.00%                        0.35%                        0.50%
         Class D                 0.15%                        0.00%                        0.50%                        0.65%
Bond
         Class A                 0.25%                        0.00%                        0.11%                        0.36%
         Class C                 0.25%                        0.00%                        0.35%                        0.60%
         Class D                 0.25%                        0.00%                        0.50%                        0.75%
International Bond
         Class A                 0.70%                        0.00%                        0.26%                        0.96%
         Class C                 0.70%                        0.00%                        0.50%                        1.20%
         Class D                 0.70%                        0.00%                        0.65%                        1.35%
Balanced
         Class A                 0.50%                        0.00%                        0.11%                        0.61%
         Class C                 0.50%                        0.00%                        0.35%                        0.85%
         Class D                 0.50%                        0.00%                        0.50%                        1.00%
Equity Index
         Class A                 0.10%                        0.00%                        0.11%                        0.21%
         Class C                 0.10%                        0.00%                        0.35%                        0.45%
         Class D                 0.10%                        0.00%                        0.50%                        0.60%

Diversified Growth
         Class A                 0.55%                        0.00%                        0.12%                        0.67%
         Class C                 0.55%                        0.00%                        0.36%                        0.91%
         Class D                 0.55%                        0.00%                        0.51%                        1.06%



<PAGE>



Focused Growth
         Class A                0.80%                        0.00%                        0.12%                        0.92%
         Class C                0.80%                        0.00%                        0.36%                        1.16%
         Class D                0.80%                        0.00%                        0.51%                        1.31%

Small Company Index
         Class A                0.20%                        0.00%                        0.14%                        0.34%
         Class C                0.20%                        0.00%                        0.38%                        0.58%
         Class D                0.20%                        0.00%                        0.53%                        0.73%
International Equity Index
         Class A                0.25%                        0.00%                        0.28%                        0.53%
         Class C                0.25%                        0.00%                        0.52%                        0.77%
         Class D                0.25%                        0.00%                        0.67%                        0.92%

International Growth
         Class A                0.80%                        0.00%                        0.26%                        1.06%
         Class C                0.80%                        0.00%                        0.50%                        1.30%
         Class D                0.80%                        0.00%                        0.65%                        1.45%

</TABLE>

Set forth below are the estimated actual management fees,  distribution  (12b-1)
fees, other expenses and total annual operating  expenses for the MarketCommand,
Mid Cap Growth and Small Company  Growth  Portfolios for the current fiscal year
as a result of fee waivers and expense reimbursements.

<TABLE>
<CAPTION>
<S><C>                         <C>                       <C>                          <C>                         <C>

Portfolio                                                Distribution                Other Expenses                Total Annual
                               Management                (12b-1) Fees                                           Operating Expenses
                               Fees
- --------------------------------------------- ---------------------------- --------------------------- ----------------------------
MarketCommand
         Class A               0.80%                        0.00                        0.12%                         0.92%
         Class C               0.80%                        0.00                        0.36%                         1.16%
         Class D               0.80%                        0.00                        0.51%                         1.31%
Mid Cap Growth
         Class A               0.80%                        0.00                        0.12%                         0.92%
         Class C               0.80%                        0.00                        0.36%                         1.16%
         Class D               0.80%                        0.00                        0.51%                         1.31%
Small Company Growth
         Class A               0.80%                        0.00                        0.11%                         0.91%
         Class C               0.80%                        0.00                        0.35%                         1.15%
         Class D               0.80%                        0.00                        0.50%                         1.30%
</TABLE>

Fee  waivers  (and  voluntary  expense  reimbursements,  if  applicable)  may be
terminated at any time at the option of the Investment Advisers. If this occurs,
the Portfolios' total annual operating expenses may increase without shareholder
approval.




<PAGE>


Example

The following Example is intended to help you compare the cost of investing in a
Portfolio  (without  fee waivers and  expense  reimbursements)  with the cost of
investing in other mutual funds.

     The Example  assumes  that you invest  $10,000 in a Portfolio  for the time
periods  indicated (with  reinvestment of all dividends and  distributions)  and
then redeem all of your  shares at the end of those  periods.  The Example  also
assumes that your  investment  has a 5% return each year and that a  Portfolio's
operating expenses remain the same.  Although your actual costs may be higher or
lower, based on these assumptions your costs would be:


<TABLE>
<CAPTION>
<S><C>                                                         <C>                <C>               <C>            <C>

Portfolio                                                         1 Year           3 Years           5 Years        10 Years

U.S. Government Securities
     Class A Shares.......................................       $   79             $246              $428           $  954
     Class C Shares.......................................       $  103             $322              $558           $1,236
     Class D Shares.......................................       $  118             $368              $638           $1,409

Short-Intermediate Bond
     Class A Shares.......................................        $  78             $243              $422           $  942
     Class C Shares.......................................        $ 102             $318              $552           $1,225
     Class D Shares.......................................        $ 117             $365              $633           $1,398

Intermediate Bond
     Class A Shares.......................................       $   82             $255              $444           $  990
     Class C Shares.......................................       $  106             $331              $574           $1,271
     Class D Shares.......................................       $  121             $378              $654           $1,443

U.S. Treasury Index
     Class A Shares.......................................        $  79             $246              $428           $  954
     Class C Shares.......................................        $ 103             $322              $558           $1,236
     Class D Shares.......................................        $ 118             $368              $638           $1,409

Bond
     Class A Shares.......................................       $   76             $237              $411           $  918
     Class C Shares.......................................       $  100             $312              $542           $1,201
     Class D Shares.......................................       $  115             $359              $622           $1,375

International Bond
     Class A Shares.......................................       $  147             $456              $787           $1,724
     Class C Shares.......................................       $  171             $530              $913           $1,987
     Class D Shares.......................................       $  186             $576              $990           $2,148

Balanced
     Class A Shares.......................................       $  101             $315              $547           $1,213
     Class C Shares.......................................       $  125            $390               $676           $1,489
     Class D Shares.......................................       $  140             $437              $755           $1,657

Equity Index
     Class A Shares.......................................       $   45             $141              $246           $  555
     Class C Shares.......................................       $   69            $218               $379           $  847
     Class D Shares.......................................       $   85            $265               $460           $1,025



<PAGE>



Diversified Growth
     Class A Shares.....................................         $   98             $306           $   531           $1,178
     Class C Shares.....................................         $  122             $381           $   660           $1,455
     Class D Shares.....................................         $  137             $428           $   739           $1,624

Focused Growth
     Class A Shares.....................................         $  128             $400           $   692           $1,523
     Class C Shares.....................................         $  153             $474           $   818           $1,791
     Class D Shares.....................................         $  168             $520           $   897           $1,955

MarketCommand
     Class A Shares.....................................         $  171             $530           $   913           $1,987
     Class C Shares.....................................         $ 195              $603           $ 1,037           $2,243
     Class D Shares.....................................         $ 210              $649           $ 1,114           $2,400

Mid Cap Growth
     Class A Shares.....................................         $ 171              $530           $   913           $1,987
     Class C Shares.....................................         $  195             $603           $ 1,037           $2,243
     Class D Shares.....................................         $ 210              $649           $ 1,114           $2,400

Small Company Index
     Class A Shares.....................................          $  83             $259           $   450           $1,002
     Class C Shares.....................................          $ 107             $334           $   579           $1,283
     Class D Shares.....................................          $ 122             $381           $   660           $1,455

Small Company Growth
     Class A Shares.....................................          $ 131             $409           $   708           $1,556
     Class C Shares.....................................          $ 156             $483           $   834           $1,824
     Class D Shares.....................................          $ 171             $530           $   913           $1,987

International Equity Index
     Class A Shares.....................................          $  93             $290           $   504           $1,120
     Class C Shares.....................................          $ 117             $365           $   633           $1,398
     Class D Shares.....................................          $ 132             $412           $   713           $1,568

International Growth
     Class A Shares.....................................          $ 133             $415           $   718           $1,579
     Class C Shares.....................................          $ 158             $490           $   845           $1,845
     Class D Shares.....................................          $ 173             $536           $   923           $2,009

</TABLE>




<PAGE>



Investment Advisers

The Northern Trust Company  ("Northern"),  an Illinois  state-chartered bank and
member of the  Federal  Reserve  System,  serves as  investment  adviser for all
Portfolios except the U.S. Treasury Index, Equity Index, Small Company Index and
International  Equity Index Portfolios.  Northern Trust  Quantitative  Advisors,
Inc. ("NTQA"), an Illinois  state-chartered trust company,  serves as investment
adviser for the U.S.  Treasury  Index,  Equity  Index,  Small  Company Index and
International Equity Index Portfolios.

Northern and NTQA are referred to as the  "Investment  Advisers." The Investment
Advisers  are  located  at 50 S.  LaSalle  Street,  Chicago,  IL  60675  and are
wholly-owned subsidiaries of Northern Trust Corporation, a bank holding company.
As of December 31, 1999,  Northern Trust  Corporation and its  subsidiaries  had
approximately  $____  billion in assets,  $____ billion in deposits and employed
over _____ persons.

Northern  has for  more  than 100  years  managed  the  assets  of  individuals,
charitable  organizations,  foundations and large corporate investors.  Northern
and its  affiliates  administered  in various  capacities  (including  as master
trustee, investment manager or custodian) approximately $____ trillion of assets
as of December 31, 1999,  including  approximately  $_____ billion of assets for
which Northern and its affiliates had investment management responsibility.

Under its Advisory Agreement with the Trust, each Investment Adviser, subject to
the general  supervision of the Trust's Board of Trustees,  is  responsible  for
making  investment  decisions for the  Portfolios for which it serves as adviser
and for placing purchase and sale orders for portfolio securities.

Prior to April 1,  1998,  Northern  served  as  investment  adviser  to the U.S.
Treasury Index, Equity Index, Small Company Index and International Equity Index
Portfolios  pursuant to advisory  agreements  substantially  identical  to those
currently in effect for such Portfolios.

Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses, each Investment Adviser is entitled to an advisory fee, computed daily
and payable monthly,  at annual rates set forth in the table below (expressed as
a percentage of each Portfolio's respective average daily net assets). The table
also  reflects  the advisory  fees (after  voluntary  fee  waivers)  paid by the
Portfolios for the fiscal year ended November 30, 1999.



<TABLE>
<CAPTION>
<S>       <C>                                      <C>            <C>

                                                                 Advisory Fee Paid
                                                  Contractual     for Fiscal Year
                   Portfolio                         Rate         Ended 11/30/99

         U.S. Government Securities                  0.60%             0.25%
         Short-Intermediate Bond                     0.60%             0.25%
         Intermediate Bond                           0.60%             0.25%
         U.S. Treasury Index                         0.40%             0.15%
         Bond                                        0.60%             0.25%
         International Bond                          0.90%             0.70%
         Balanced                                    0.80%             0.50%
         Equity Index                                0.30%             0.10%
         Diversified Growth                          0.80%             0.55%
         Focused Growth                              1.10%             0.80%
         MarketCommand                               1.10%              N/A
         Mid Cap Growth                              1.10%              N/A
         Small Company Index                         0.40%             0.20%
         Small Company Growth                        1.10%              N/A
         International Equity Index                  0.50%             0.25%
         International Growth                        1.00%             0.80%
</TABLE>



The difference,  if any,  between the  contractual  advisory fees and the actual
advisory  fees paid by the  Portfolios  reflects  the fact  that the  Investment
Advisers did not charge the full amount of the advisory fees to which they would
have been  entitled.  The  Investment  Advisers may  discontinue or modify their
voluntary limitations in the future at their discretion.

Portfolio Management

The Investment  Advisers employ a team approach to the investment  management of
the Portfolios,  relying upon investment  professionals  under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern and Chairman and Chief Executive  Officer of NTQA. Below is information
regarding the management of the actively managed Portfolios.

Mark J. Wirth, Senior Vice President of Northern,  is the management team leader
for the Bond  Portfolio and the  Short-Intermediate  Bond  Portfolio and has had
such  responsibility  for these Portfolios since 1993. Mr. Wirth joined Northern
in 1986 and  during  the past  five  years  has  managed  various  fixed  income
portfolios.

     Steven M. Schafer and Guy Williams,  Vice  Presidents of Northern,  are the
management team leaders for the  International  Bond Portfolio.  Mr. Schafer has
had  such   responsibility   since  July  1998.   Mr.   Williams  has  had  such
responsibility for the Fund since September 1999. Mr. Schafer joined Northern in
1988 and during the past five years has managed various fixed income  portfolios
and served as credit analyst  following both  industrial and utility  companies.
Mr.  Williams  joined Northern in 1999. From 1992 to 1999, he was a global fixed
income manager for Paribas Asset Management.

     The management team leader for the International Growth Portfolio is Robert
A.  LaFleur,  Senior  Vice  President  of  Northern.  Mr.  LaFleur  has had such
responsibility  since 1994. Mr.  LaFleur joined  Northern in 1982 and during the
past five years has managed various international equity portfolios.

     The management team leaders for the U.S.  Government  Securities  Portfolio
are Mark J. Wirth and Peter T. Marchese,  Second Vice President of Northern. Mr.
Wirth  has had  such  responsibility  since  1998.  Mr.  Marchese  has had  such
responsibility  since July 1999. Mr. Marchese joined Northern in 1990 and during
the  past  five  years  has  managed  various  money  market  and  fixed  income
portfolios.

     The management team leaders for the Intermediate Bond Portfolio are Mark J.
Wirth and Steven M. Schafer.  Mr. Wirth has had such  responsibility  since 1998
and Mr. Schafer has had such responsibility since 1997.

     The management team leaders for the Diversified Growth Portfolio are Jon D.
Brorson,  Senior  Vice  President  of  Northern,  and  John J.  Zielinski,  Vice
President of Northern.  Mr. Brorson has had such responsibility  since 1996. Mr.
Zielinski has had such responsibility since 1999. Mr. Brorson joined Northern in
1996.  From  1990 to 1996,  he was with  Hartline  Investment  Corp.,  where his
primary  responsibilities  included portfolio  management,  investment research,
sales and trading.  Mr.  Zielinski  joined  Northern in 1980 and during the past
five years has managed various equity portfolios.

     The  management  team leaders for the Focused  Growth  Portfolio are Jon D.
Brorson and Ken Turek,  Vice  President  of Northern.  Mr.  Brorson has had such
responsibility since 1996. Mr. Turek has had such responsibility since 1999. Mr.
Turek joined Northern in 1997 and has managed equity  investment  portfolios for
institutional clients. From 1994 to 1997, Mr. Turek was the chief equity officer
of National Investment Services.

     The management team leaders for the Balanced Portfolio are Monty M. Memler,
Vice  President  of  Northern  and John J.  Zielinski.  Mr.  Memler has had such
responsibility since 1993. Mr. Zielinski has had such responsibility since 1999.
Mr.  Memler  joined  Northern in 1986 and during the past five years has managed
various fixed income portfolios.

     The management team leader for the Small Company Growth  Portfolio is David
H.   Burshtan,   Vice  President  of  Northern.   Mr.   Burshtan  has  had  such
responsibility  since the Portfolio  commenced  operations in December 1999. Mr.
Burshtan  joined  Northern  in 1999.  From  1995 to  1999,  Mr.  Burshtan  was a
Portfolio  manager  for  various  small cap  mutual  funds with  Scudder  Kemper
Investments,  Inc. From 1993 to 1995, Mr. Burshtan held a variety of analyst and
portfolio management positions with Northern.


     The management  team for the  MarketCommand  Portfolio is R. Randall Canent
and Robert G. Mitchell, Vice Presidents of Northern. Messrs. Canent and Mitchell
each has had such  responsibility  since the Portfolio  commenced  operations in
February 2000. Mr. Canent joined Northern in 1992 and during the past five years
has managed various equity portfolios.  Mr. Mitchell joined Northern in 1988 and
during  the  past  five  years  has  managed   various  equity   portfolios  for
institutional clients.


     The management  team leader for the Mid Cap Growth  Portfolio is Ken Turek,
Vice  President of Northern.  Mr.  Turek has had such  responsibility  since the
Portfolio  commenced  operations in December 1999. Mr. Turek joined  Northern in
1997 and has managed equity  investment  portfolios for  institutional  clients.
From 1994 to 1997,  Mr.  Turek was chief equity  officer of National  Investment
Services.

Other Portfolio Management Information

On September 2, 1997, the  shareholders of the  International  Growth  Portfolio
approved a new investment advisory agreement which would allow this Portfolio to
implement  a  "manager  of  managers"  structure  with  Northern  and one of its
affiliates,  and would allow the Portfolio's  investment  advisers to enter into
sub-advisory  agreements  with respect to the Portfolio  with other firms in the
future  without  further  shareholder  approval.  Although  the  Securities  and
Exchange  Commission (the "SEC") has granted an exemptive  order  permitting the
manager of managers  structure  for the  Portfolio,  the  structure  will not be
implemented without final authorization by the Board of Trustees. At present, it
is uncertain when, or if, this structure will become effective.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer Agent") and custodian for each
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its services in these capacities are described on page __
under  "Portfolio  Fees  and  Expenses"  and  in  the  Statement  of  Additional
Information.  Northern  and PFPC Inc.,  formerly  First Data  Investor  Services
Group, Inc. ("PFPC"),  serve as co-administrators  for the Portfolios.  The fees
that  Northern  and  PFPC  receive  for  their  co-administrative  services  are
described on page __ under "Portfolio Fees and Expenses."

                         PURCHASING AND SELLING SHARES

Purchasing Shares

Institutional  investors,  acting  on their  own  behalf  or on  behalf of their
customers,  clients,  employees,  participants  and  others  ("Customers"),  may
purchase  shares of the  Portfolios  through  their  institutional  accounts  at
Northern or an affiliate. They may also purchase shares directly from the Trust.
There is no sales charge imposed on purchases of shares.
Institutional investors include:

               Northern and its affiliates;
               Defined  contribution plans having at least $30 million in assets
               or  annual  contributions  of at  least  $5  million;  and  Other
               institutions and organizations.

The Portfolios  currently  offer a choice of three classes of shares to meet the
special needs of institutional investors ("Institutions").

      Class A Shares are designed for Institutions  that can obtain  information
about their  shareholder  accounts  and do not require the  additional  services
available to other classes.

      Class C Shares are  designed  for  Institutions  that require the Transfer
     Agent and a Servicing  Agent to provide  certain  account-related  services
     incident to Customers being the beneficial owners of shares.

      Class D Shares are  designed  for  Institutions  that require the Transfer
     Agent  and a  Servicing  Agent to  provide  them and their  Customers  with
     certain account-related services and other information.

Different  shareholder  servicing  and transfer  agency fees are payable by each
class of shares (see "Portfolio Fees and Expenses" on page __). In addition, any
person  entitled to receive  compensation  for selling or servicing  shares of a
Portfolio  may receive  different  compensation  with respect to one  particular
class of shares over another in the same Portfolio.

Opening an Account

You may purchase shares of the Portfolios through your institutional  account at
Northern (or an  affiliate)  or you may open an account  directly with the Trust
with a minimum initial investment of $5 million in one or more Portfolios. There
is no minimum for subsequent investments.

Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  shares  through your  account,  contact your  Northern
representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase shares directly from the Trust as described in this Prospectus.

          By   Mail.
               Read this prospectus  carefully.  Complete and sign the new
               account application. Include a certified corporate resolution (or
               other  acceptable  evidence  of  authority).  Enclose  a check or
               Federal  Reserve  draft  payable to the  specific  Portfolio.  If
               investing in more than one  Portfolio,  please include a separate
               check  for  each.  Mail  your  check,  corporate  resolution  and
               completed application to:

               Northern Institutional Funds, c/o The Northern Trust Company P.O.
               Box 75943 Chicago, Illinois 60675-5943

     All checks must be payable in U.S. dollars and drawn on a bank
located in the United States.  Cash and third party checks are not acceptable.

     By Telephone.
               Read  this  prospectus  carefully.  Call  the  Transfer  Agent at
               1-800-637-1380. To open a new account please provide:
                   The name of the  Portfolio  in which you'd like to invest The
                   number of shares or dollar  amount to be invested  The method
                   of payment
               To add to an existing account, please provide:
                   The Institution's name
                   Your Account Number

     By Wire or Automated Clearing House Transfer ("ACH Transfer").
               To open a new account:
                   Call the Transfer Agent at 1-800-637-1380 for instructions To
               add to an existing account:
                 Have your bank wire Federal funds or effect an ACH Transfer to:

                               The Northern Trust Company
                               Chicago, Illinois
                               ABA Routing No. 0710-00152
                               (Reference 10 Digit Portfolio Account No.)
                               (Reference Shareholder's Name)

For more  information  about the purchase of shares,  call the Transfer Agent at
1-800-637-1380.



<PAGE>


Selling Shares

Through an Institutional Account.  Institutions may sell (redeem) shares through
their institutional account by contacting their Northern account representative.

     Directly through the Trust. Institutions that purchase shares directly from
the Trust may redeem  their  shares  through  the  Transfer  Agent in one of the
following ways:

     By Mail.
               Send a written request to:
              Northern Institutional Funds
              c/o The Northern Trust Company
              P.O. Box 75943
              Chicago, Illinois 60675-5943
               The letter of instruction  must include:  The signature of a duly
                   authorized  person  Your  account  number  The  name  of  the
                   Portfolio  The  number of shares or the  dollar  amount to be
                   redeemed

     By Telephone.
               Call the Transfer Agent at 1-800-637-1380 for instructions.
               During periods of unusual economic or market activity,  telephone
              redemptions  may  be  difficult  to  implement.   In  such  event,
              shareholders  should follow the  procedures  outlined  above under
              "Selling Shares -- By Mail."

     By Wire.
               Call the Transfer Agent at 1-800-637-1380  for instructions.  You
               must  have  given  prior   authorization   for   expedited   wire
               redemption.  The  minimum  amount  that may be  redeemed  by this
               method is $10,000.

Account Policies and Other Information

Purchase and Redemption  Minimums.  There is a minimum initial  investment of $5
million  in  one  or  more  Portfolios.  There  is  no  minimum  for  subsequent
investments.  A $10,000  minimum  applies  for  redemptions  by wire.  The Trust
reserves the right to waive  purchase and  redemption  minimums and to determine
the manner in which a minimum is satisfied.

Calculating Share Price. The Trust issues shares and redeems shares at net asset
value  ("NAV").  The NAV for each share class of a Portfolio  is  calculated  by
dividing the value of the Portfolio's net assets attributed to that class by the
number of outstanding shares of that class. The NAV for each class is calculated
as of 3:00 p.m.,  Chicago time,  each Business Day. The NAV used in  determining
the price of your shares is the one calculated after your purchase,  exchange or
redemption order is received and accepted as described below.

U.S. and foreign  securities  held by a Portfolio  generally are valued at their
market prices. Shares of an investment company held by a Portfolio are valued at
their net asset value.  Any securities,  including  restricted  securities,  for
which  market  prices  are not  readily  available  are  valued at fair value as
determined  by  the  Investment  Advisers.  Short-term  obligations  held  by  a
Portfolio are valued at their amortized cost which,  according to the Investment
Advisers, approximates market value.

A Portfolio  may hold  foreign  securities  that trade on weekends or other days
when the  Portfolio  does not price  its  shares.  Therefore,  the value of such
securities may change on days when  shareholders will not be able to purchase or
redeem shares.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 3:00 p.m., Chicago time, on any Business Day will be
executed the same day, at that day's  closing  share price (plus any  additional
transaction fee) provided that either:

               The Transfer  Agent  receives  the  purchase  price in Federal or
               other  immediately  available  funds prior to 3:00 p.m.,  Chicago
               time,  on the same  Business  Day;  The order is  accepted  by an
               authorized   intermediary   and   payment  in  Federal  or  other
               immediately  available  funds  is made on the next  Business  Day
               according to procedures
              authorized by the Trust; or
               Payment  in  Federal  or  other  immediately  available  funds is
received on the next Business Day in an  institutional  account  maintained with
Northern or an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 3:00 p.m.  on a Business  Day will be executed on the
next  Business  Day, at that day's  closing  share  price  (plus any  additional
transaction  fee),  provided  that  payment  is  made  as  noted  above.  If  an
Institution  pays for  shares by check,  Federal  funds  generally  will  become
available within two Business Days after a purchase order is received.

     In certain circumstances,  the Trust may advance the time by which purchase
orders must be received. See "Early Closings" on page ____.

Additional  Transaction  Fee.  Purchases  of, and exchanges  for,  shares of the
MarketCommand,  Small Company Index and  International  Equity Index  Portfolios
require the payment of an  additional  transaction  fee.  This fee equals 0.50%,
0.50% and 1.00%, respectively, of the dollar amount purchased. It does not apply
to reinvested  dividends or capital gains  distributions.

     This  transaction  fee is not a sales charge.  It is paid to the Portfolios
and is used to protect existing shareholders by offsetting the transaction costs
associated  with new purchases of securities  by the  Portfolios.  Because these
transaction  costs are not paid out of their  other  assets,  the Small  Company
Index  Portfolio and the  International  Equity Index  Portfolio are expected to
track their respective indices more closely.

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.

In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment for shares in the form of securities  that are  permissible  investments
for a  Portfolio.  The Trust also  reserves  the right to pay  redemptions  by a
distribution "in-kind" of securities (instead of cash) from a Portfolio. See the
Statement of Additional  Information for further  information about the terms of
these purchases and redemptions.

Miscellaneous Purchase Information.

      Institutions  are  responsible  for  transmitting  purchase  orders to the
Transfer Agent and delivering required funds on a timely basis.

      Institutions are responsible for all losses and expenses of a Portfolio in
     the  event of any  failure  to make  payment  according  to the  procedures
     outlined in this prospectus. Northern may redeem shares from any account it
     maintains to protect the Portfolios and Northern against loss. In addition,
     a $20 charge will be imposed if a check does not clear.

      The Trust reserves the right to reject any purchase order.  The Trust also
reserves the right to change or discontinue any of its purchase procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
received in good order by the Transfer Agent or other authorized intermediary by
3:00 p.m., Chicago time, on a Business Day will be executed on the same day. The
redemption  or exchange will be effected at that day's closing share price (plus
any additional transaction fee, in the case of an exchange). Redemption proceeds
will normally be sent or credited on the next Business Day.



<PAGE>


Orders received in good order on a non-Business Day or after 3:00 p.m.,  Chicago
time,  on a Business Day will be executed the next  Business  Day, at that day's
closing  share price  (plus any  additional  transaction  fee, in the case of an
exchange).  The proceeds will  normally be sent or credited the second  Business
Day. We consider requests to be in "good order" when all required  documents are
properly  completed,  signed  and  received,  including  a  certified  corporate
resolution or other acceptable evidence of authority.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page ____.

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

     The  Trust  reserves  the  right  to defer  crediting,  sending  or  wiring
redemption proceeds for up to 7 days after receiving the redemption order if, in
its judgment, an earlier payment could adversely affect a Portfolio.

     If you are redeeming recently purchased shares, your redemption request may
not be honored until your check or electronic  transaction has cleared. This may
delay your transaction for up to 15 days.

      Institutions  are responsible for  transmitting  redemption  orders to the
Transfer Agent and crediting their Customers'  accounts with redemption proceeds
on a timely basis.

     Redemption  requests  by mail  must be  signed  by a person  authorized  by
acceptable documentation on file with the Transfer Agent.

     The Trust reserves the right to redeem shares held by any  shareholder  who
provides  incorrect or incomplete  account  information or when such involuntary
redemptions  are  necessary to avoid adverse  consequences  to the Trust and its
shareholders.

     The Trust may require any information reasonably necessary to ensure that a
redemption has been duly authorized.

      The  Trust  reserves  the  right  to  change  or  discontinue  any  of its
redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their  account  agreements)  may exchange  shares of a Portfolio for the same
class of shares of another Portfolio. The registration of both accounts involved
must be  identical.  A $1,000  minimum  investment  applies.  An  exchange  is a
redemption  of shares of one  Portfolio  and the  purchase  of shares of another
Portfolio. It is considered a taxable event and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days written notice to shareholders  and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

     Business Day. A "Business  Day" is each Monday  through Friday when the New
York Stock Exchange (the "Exchange") is open for business. A "Business Day" does
not include a holiday  observed  by the  Exchange.  In 1999 these days are:  New
Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Good Friday,  Memorial
Day, Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolios  reserve the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  They also reserve this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering funds on a timely basis. A Portfolio will be
deemed to have  received an order when the order is  accepted by the  authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Servicing  Agents.   Certain  Institutions  may  perform  (or  arrange  to  have
performed)  various  administrative  support  services for Customers who are the
beneficial  owners  of Class C or D shares  through  agreements  with the  Trust
("Service Agents"). These agreements are permitted under the Trust's Shareholder
Servicing Plan. The level of support services required by an Institution and its
Customers generally will determine whether they purchase Class A, C or D shares.

Administrative support services may include:

               processing purchase and redemption requests from investors;

               placing net purchase and redemption orders with the Transfer
               Agent;

               providing necessary personnel and facilities to establish and
               maintain investor accounts and records; and

               providing information periodically to investors showing their
               positions in Portfolio shares.

Servicing  Agents will receive fees from the  Portfolios for such services at an
annual  rate of up to 0.15% and 0.25% of the  average  daily net asset  value of
Class C and Class D shares,  respectively.  These fees will be borne exclusively
by the beneficial owners of Class C and D shares.  Please note that Northern and
NTQA may also  provide  compensation  to  certain  dealers  and other  financial
intermediaries  who provide  services to their Customers who invest in the Trust
or whose Customers  purchase  significant  amounts of a Portfolio's  shares. The
amount of such compensation may be made on a one-time and/or periodic basis, and
may represent all or a portion of the annual fees earned by Northern and NTQA as
Investment Advisers (after  adjustments).  This additional  compensation will be
paid by Northern,  NTQA or their affiliates and will not represent an additional
expense to the Trust or its shareholders.



<PAGE>


Customers  purchasing  shares through an  Institution  should read their account
agreements carefully. An Institution's requirements may differ from those listed
in this  Prospectus.  An Institution  may also impose account  charges,  such as
asset allocation  fees,  account  maintenance  fees, and other charges that will
reduce the net return on an investment in a Portfolio.  If a Customer has agreed
with a particular Institution to maintain a minimum balance with the Institution
and the balance falls below this minimum, the Customer may be required to redeem
all or a part of his investment in a Portfolio.

Conflict of interest  restrictions may apply to the receipt of compensation paid
by the Trust to a Servicing Agent in connection with the investment of fiduciary
funds in Portfolio shares. Banks and other institutions  regulated by the Office
of Comptroller of the Currency, Board of Governors of the Federal Reserve System
and state banking commissions,  and investment advisers and other money managers
subject  to the  jurisdiction  of the  SEC,  the  Department  of  Labor or state
securities commissions,  are urged to consult legal counsel before entering into
servicing agreements.

     State securities laws regarding the registration of dealers may differ from
Federal law. As a result,  Institutions investing in the Portfolios on behalf of
their Customers may be required to register as dealers.

Dividends and Distributions

Dividends and capital gain  distributions  of each  Portfolio are  automatically
reinvested in additional  shares of the same Portfolio  without any sales charge
or additional purchase price amount.

You may,  however,  elect to have  dividends or capital gain  distributions  (or
both)  paid in cash or  reinvested  in the  same  class  of  shares  of  another
Portfolio at their net asset value per share (plus an additional  purchase price
amount equal to 0.50% and 1.00% of the amount  invested in the case of the Small
Company Index Portfolio and International Equity Index Portfolio, respectively).
If you would like to receive  dividends  or  distributions  in cash or have them
reinvested in another  Portfolio,  you must notify the Transfer Agent in writing
at least two days before the dividend or distribution record date. Dividends and
distributions  may only be  reinvested  in a Portfolio  in which you maintain an
account.

The following table summarizes the general distribution policies for each of the
Portfolios:
<TABLE>
<CAPTION>
<S><C>                                                 <C>                                   <C>

- --------------------------------------- -------------------------------------- --------------------------------------
                                                  Dividends, if any                    Capital gains, if any
              Portfolio                           Declared and Paid                      Declared and Paid
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
U.S. Government Securities                             Monthly                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Short-Intermediate Bond                                Monthly                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Intermediate Bond                                      Monthly                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
U.S. Treasury Index                                    Monthly                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Bond                                                   Monthly                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
International Bond                                    Quarterly                              Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Balanced                                              Quarterly                              Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Equity Index                                          Quarterly                              Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Diversified Growth                                    Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Focused Growth                                        Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
MarketCommand                                         Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Mid Cap Growth                                        Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Small Company Index                                   Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
Small Company Growth                                  Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
International Equity Index                            Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
- --------------------------------------- -------------------------------------- --------------------------------------
International Growth                                  Annually                               Annually
- --------------------------------------- -------------------------------------- --------------------------------------
</TABLE>

A Portfolio with an annual dividend or  distribution  policy may, in some years,
make  additional  dividends or  distributions  to the extent  necessary  for the
Portfolio to avoid incurring unnecessary tax liabilities.



<PAGE>


Tax Considerations

Each Portfolio intends to qualify as a regulated  investment company for Federal
tax purposes,  and to distribute to  shareholders  substantially  all of its net
investment   income  and  net  capital  gain.  The  Portfolios'   dividends  and
distributions  will be taxable to you for  Federal,  state and local  income tax
purposes, unless you have a tax-advantaged account.  Dividends and distributions
are taxable whether they are received in cash or reinvested in Portfolio shares.
In general,  distributions  attributable to interest,  dividend, certain foreign
exchange gain and  short-term  capital gain income of the Portfolios are taxable
to you as  ordinary  income.  Distributions  attributable  to any  excess of net
long-term  capital gains of a Portfolio over net  short-term  capital losses are
generally  taxable to you as long-term capital gains. This is true no matter how
long you own your shares.

There are certain tax  requirements  that the Portfolios must follow in order to
avoid Federal taxation.  In their efforts to adhere to these  requirements,  the
Portfolios  may  have to  limit  their  investment  activity  in some  types  of
instruments.

A portion of dividends  paid by the Balanced and Equity  Portfolios  may qualify
for the dividends-received  deduction for corporations.  It is not expected that
any dividends paid by the International Equity Index and Fixed Income Portfolios
will qualify for this deduction.

The sale of Portfolio  shares is a taxable  event on which a gain or loss may be
recognized.  For tax purposes, an exchange is considered the same as a sale. The
amount of gain or loss is based on the difference  between your tax basis in the
Portfolio  shares  and  the  amount  you  receive  for  them  upon  disposition.
Generally,  you will recognize  long-term  capital gain or loss if you have held
your  Portfolio  shares for over twelve  months at the time you sell or exchange
them. Shares held six months or less may also generate long-term capital loss to
the extent of any capital gains distributions  received on the shares while they
were held by you.

Timing.  Dividends  and  distributions  from each  Portfolio  will  generally be
taxable  to you in the tax year in  which  they are  paid,  with one  exception.
Dividends  and  distributions  declared by a Portfolio  in October,  November or
December and paid in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.

Effect  of  foreign  taxes.  So long as more  than 50% of the value of the total
assets of the International Bond,  International Growth and International Equity
Index Portfolios consists of stock or securities  (including debt securities) of
foreign corporations at the close of a taxable year, these Portfolios may elect,
for Federal  income tax purposes,  to treat certain  foreign taxes paid by them,
including  generally any  withholding and other foreign income taxes, as paid by
their shareholders. Should the Portfolios make this election, the amount of such
foreign  taxes paid by the  Portfolios  will be included in their  shareholders'
income pro rata (in  addition  to taxable  distributions  actually  received  by
them),  and such  shareholders  will be  entitled  either  (a) to  credit  their
proportionate   amounts  of  such  taxes  against   their  Federal   income  tax
liabilities,  or (b) to deduct such  proportionate  amounts  from their  Federal
taxable income under certain circumstances.

Tax effect of "buying a dividend." A  Portfolio's  share price may, at any time,
reflect undistributed capital gains or income and unrealized appreciation.  When
these amounts are distributed, they will be taxable to you. For this reason, you
should be especially mindful that if you buy shares on or just before the record
date of a dividend or capital  gains  distribution,  you will pay the full price
for the  shares  and then  receive  back a  portion  of the  money you have just
invested in the form of a taxable dividend or capital gain.

Your investment in the Portfolios  could have additional tax  consequences.  You
should  consult  your  tax  professional  for  information   regarding  all  tax
consequences  applicable  to  your  investments  in  the  Portfolios.  More  tax
information is provided in the Statement of Additional  Information.  This short
summary is not intended as a substitute for careful tax planning.


Year 2000 Issues

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 arrives, many systems may be unable to
accurately process certain date-based  information,  which could cause a variety
of operational problems for businesses. This could have a negative effect on the
companies  in  which  the  Portfolios  invest,   thus  hurting  the  Portfolios'
investment  returns.

     Northern  Trust  has  implemented  steps to  prepare  its  mission-critical
computer  systems and processes for Year 2000  processing.  It has established a
dedicated  Year  2000  Project  Team  whose  members  have  significant  systems
development  and  maintenance  experience.  Northern  Trust's  Year 2000 project
included a comprehensive testing plan of its mission-critical  systems. Northern
Trust has advised the Trust that it has completed  work on its  mission-critical
systems and testing with significant outside parties.

Northern  Trust also  instituted  a program to monitor and assess the efforts of
other parties,  such as other service providers to the Portfolios.  However,  it
cannot control the success of those other parties'  efforts.  Contingency  plans
have been  established  where believed  necessary to provide Northern Trust with
alternatives   in  case  these  entities   experience   significant   Year  2000
difficulties that impact Northern Trust.

     Furthermore,  even if the actions taken by Northern  Trust are  successful,
the  normal  operations  of the  Portfolios  may,  in any  event,  be  disrupted
significantly  by the failure of  communications  and public utility  companies,
governmental entities,  financial processors or others to perform their services
as a result of Year 2000 problems.

Efforts in foreign  countries to remediate  potential Year 2000 problems are not
as extensive  as those in the United  States.  As a result,  the  operations  of
foreign markets, foreign issuers and foreign governments may be disrupted by the
Year 2000 problem and the  investment  portfolio of a Portfolio may be adversely
affected.

             RISKS, SECURITIES, TECHNIQUES AND FINANCIAL INFORMATION

                        RISKS, SECURITIES AND TECHNIQUES

This section takes a closer look at some of the Portfolios' principal investment
strategies and related risks. It also explores the various investment securities
and techniques  that the investment  management team may use. The Portfolios may
invest in other  securities  and are subject to further  restrictions  and risks
which are described in the Statement of Additional Information.  You should note
that a Portfolio's investment objective may be changed by Northern Institutional
Funds'  Board of  Trustees  without  shareholder  approval.  Shareholders  will,
however,  be notified of any changes.  Any such change may result in a Portfolio
having  an  investment   objective   different  from  the  objective  which  the
shareholder  considered  appropriate at the time of investment in the Portfolio.

ADDITIONAL  INFORMATION  ON INVESTMENT  OBJECTIVES,  PRINCIPAL  INVESTMENT
STRATEGIES AND RELATED RISKS

     Investment  Objectives.  The investment  objective of each of the following
     Portfolios  may be  changed  by  the  Trust's  Board  of  Trustees  without
     shareholder approval: Intermediate Bond Portfolio, MarketCommand Portfolio,
     Mid Cap Growth Portfolio and Small Company Growth  Portfolio.  Shareholders
     will, however, be notified of any changes.  Any such change may result in a
     Portfolio having an investment objective different from the objective which
     the  shareholder  considered  appropriate  at the time of investment in the
     Portfolio.  The  investment  objectives of the other  Portfolios may not be
     without shareholder approval.

Derivatives.  Each Portfolio may purchase certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from---or  based
upon---the  performance  of  underlying  assets,  interest or currency  exchange
rates,  or  indices.  Many  types of  instruments  representing  a wide range of
potential  risks and  rewards  are  derivatives,  including  futures  contracts,
options,  interest rate and currency swaps, equity swaps, structured securities,
forward   currency   contracts  and  structured  debt   obligations   (including
collateralized mortgage obligations and other types of asset-backed  securities,
"stripped" securities and various floating rate instruments, including leveraged
"inverse floaters").

         Investment strategy. A Portfolio will invest in derivatives only if the
         potential  risks  and  rewards  are  consistent  with  the  Portfolio's
         objective,  strategies and overall risk profile. The Portfolios may use
         derivatives  for hedging  purposes  to offset a  potential  loss in one
         position by  establishing  an interest  in an  opposite  position.  The
         Portfolios may also use derivatives for speculative  purposes to invest
         for potential income or capital gain.

         Special risks.  Engaging in derivative  transactions  involves  special
         risks,  including  (a)  market  risk that the  Portfolio's  derivatives
         position will lose value;  (b) credit risk that the counterparty to the
         transaction  will default;  (c)  leveraging  risk that the value of the
         derivative instrument will decline more than the value of the assets on
         which it is based; (d) illiquidity risk that a Portfolio will be unable
         to sell its position because of lack of market depth or disruption; (e)
         pricing  risk  that  the  value  of a  derivative  instrument  will  be
         difficult to determine; and (f) operations risk that loss will occur as
         a  result  of  inadequate   systems  or  human  error.  Many  types  of
         derivatives have been recently  developed and have not been tested over
         complete  market cycles.  For these  reasons,  a Portfolio may suffer a
         loss whether or not the analysis of the investment  management  team is
         accurate.

     Foreign  Investments.  Foreign  securities  include  direct  investments in
non-U.S.  dollar-denominated  securities traded outside of the United States and
dollar-denominated  securities of foreign  issuers  traded in the United States.
Foreign securities also include indirect investments such as American Depository
Receipts ("ADRs"),  European  Depository Receipts ("EDRs") and Global Depository
Receipts ("GDRs"). ADRs are U.S. dollar-denominated receipts representing shares
of foreign-based corporations. ADRs are issued by U.S. banks or trust companies,
and entitle the holder to all  dividends  and capital gains that are paid out on
the underlying  foreign  shares.  EDRs and GDRs are receipts  issued by non-U.S.
financial  institutions  that often trade on foreign  exchanges.  They represent
ownership  in  an  underlying   foreign  or  U.S.  security  and  are  generally
denominated in a foreign currency.

         Investment strategy. The International Bond, International Equity Index
         and International  Growth Portfolios will invest a substantial  portion
         of  their   total   assets   in   foreign   securities.   Each  of  the
         Short-Intermediate Bond, Bond, Intermediate Bond, Balanced, Diversified
         Growth and Focused Growth, Small Company Growth, the Mid Cap Growth and
         MarketCommand  Portfolios may invest up to 25% of their total assets in
         foreign securities, including ADRs, EDRs and GDRs. These Portfolios may
         also invest in foreign time deposits and other short-term instruments.

         The International  Growth and International  Bond Portfolios may invest
         more  than 25% of their  total  assets  in the  securities  of  issuers
         located in Japan,  the United Kingdom,  France,  Germany or Switzerland
         because the securities markets in those countries are highly developed,
         liquid and subject to extensive  regulation.  The International  Equity
         Index Portfolio  invests in countries  according to their weightings in
         the EAFE Index.

         Special  risks.  Foreign  securities  involve  special risks and costs.
         Foreign  securities,  and in particular  foreign debt  securities,  are
         sensitive to changes in interest rates. In addition,  investment in the
         securities  of  foreign  governments  involves  the risk  that  foreign
         governments  may  default on their  obligations  or may  otherwise  not
         respect the integrity of their debt. The  performance of investments in
         securities denominated in a foreign currency will also depend, in part,
         on the strength of the foreign currency against the U.S. dollar and the
         interest rate  environment in the country issuing the currency.  Absent
         other  events  which  could  otherwise  affect  the  value of a foreign
         security  (such as a change in the  political  climate  or an  issuer's
         credit  quality),  appreciation  in the value of the  foreign  currency
         generally   results   in   an   increase   in   value   of  a   foreign
         currency-denominated  security in terms of U.S.  dollars.  A decline in
         the value of the foreign currency relative to the U.S. dollar generally
         results  in a  decrease  in  value  of a  foreign  currency-denominated
         security.

         Investment  in  foreign   securities  may  involve  higher  costs  than
         investment in U.S. securities, including higher transaction and custody
         costs  as  well  as the  imposition  of  additional  taxes  by  foreign
         governments. Foreign investments may also involve risks associated with
         the  level  of  currency  exchange  rates,   less  complete   financial
         information  about the  issuers,  less  market  liquidity,  more market
         volatility  and political  instability.  Future  political and economic
         developments,  the possible imposition of withholding taxes on dividend
         income,  the possible seizure or  nationalization  of foreign holdings,
         the  possible  establishment  of  exchange  controls  or freezes on the
         convertibility  of  currency,  or the  adoption  of other  governmental
         restrictions   might   adversely   affect  an   investment  in  foreign
         securities.   Additionally,  foreign  banks  and  foreign  branches  of
         domestic banks may be subject to less stringent  reserve  requirements,
         and to different accounting, auditing and recordkeeping requirements.

         Additional risks are involved when investing in countries with emerging
         economies or  securities  markets.  These  countries are located in the
         Asia/Pacific  region,  Eastern  Europe,  Latin  and South  America  and
         Africa. In general,  the securities markets of these countries are less
         liquid,  are subject to greater price  volatility,  have smaller market
         capitalizations  and have problems  with  securities  registration  and
         custody. In addition,  because the securities settlement procedures are
         less  developed  in these  countries,  a  Portfolio  may be required to
         deliver securities receiving payment and may also be unable to complete
         transactions during market disruptions.  As a result of these and other
         risks,  investments in these countries generally present a greater risk
         of loss to the Portfolios.

         While the Portfolios'  investments may, if permitted, be denominated in
         foreign currencies,  the portfolio  securities and other assets held by
         the Portfolios are valued in U.S. dollars.  Currency exchange rates may
         fluctuate   significantly   over  short   periods  of  time  causing  a
         Portfolio's  net asset value to  fluctuate as well.  Currency  exchange
         rates can be affected  unpredictably by the intervention or the failure
         to intervene by U.S. or foreign  governments  or central  banks,  or by
         currency  controls or political  developments in the U.S. or abroad. To
         the extent that a Portfolio  is  invested in foreign  securities  while
         also  maintaining  currency  positions,  it may be  exposed  to greater
         combined risk. The  Portfolios'  respective net currency  positions may
         expose them to risks independent of their securities positions.

         The introduction of a single currency, the euro, on January 1, 1999 for
         participating  nations in the  European  Economic  and  Monetary  Union
         presents unique uncertainties, including the legal treatment of certain
         outstanding  financial  contracts  after  January 1, 1999 that refer to
         existing  currencies  rather  than  the  euro;  the  establishment  and
         maintenance of exchange rates for currencies  being  converted into the
         euro;  the  fluctuation  of the euro  relative to  non-euro  currencies
         during the transition  period from January 1, 1999 to December 31, 2001
         and  beyond;  whether  the  interest  rate,  tax and labor  regimes  of
         European  countries  participating in the euro will converge over time;
         and whether the conversion of the currencies of other  countries in the
         European Union ("EU"), such as the United Kingdom and Denmark, into the
         euro and the admission of other non-EU countries such as Poland, Latvia
         and  Lithuania  as  members  of the EU may have an  impact on the euro.
         These or other factors,  including  political and economic risks, could
         cause  market  disruptions,  and could  adversely  affect  the value of
         securities held by the  Portfolios.  Because of the number of countries
         using this single currency,  a significant portion of the assets of the
         International Equity Index, International Growth and International Bond
         Portfolios may be denominated in the euro.

     Investment Grade Securities.  A security is considered investment grade if,
at the time of purchase, it is rated:

               BBB or higher by Standard and Poor's Ratings Services ("S&P");
               Baa or higher by Moody's Investors Service, Inc. ("Moody's");
               BBB or higher by Duff & Phelps Credit Rating Co. ("Duff"); or
               BBB or higher by Fitch IBCA Inc. ("Fitch").

A security will be considered  investment  grade if it receives one of the above
ratings, even if it receives a lower rating from other rating organizations.

         Investment  strategy.  Each  Portfolio  may invest in fixed  income and
         convertible  securities to the extent  consistent  with its  investment
         objective  and  policies.  Except  as stated  in the  section  entitled
         "Non-Investment  Grade  Securities," these securities will generally be
         rated  investment  grade.  The  Portfolios  may also  invest in unrated
         securities if the  Investment  Adviser  believes they are comparable in
         quality.

         Special risks.  Although securities rated BBB by S&P, Duff or Fitch, or
         Baa by Moody's  are  considered  investment  grade,  they have  certain
         speculative characteristics. Therefore, they may be subject to a higher
         risk of default than obligations with higher ratings. Subsequent to its
         purchase by a Portfolio,  a rated security may cease to be rated or its
         rating may be reduced below the minimum rating required for purchase by
         the Portfolio.  The  Investment  Adviser will consider such an event in
         determining whether the Portfolio should continue to hold the security.

     Non-Investment  Grade  Securities.  Non-investment  grade fixed  income and
convertible  securities  (sometimes  referred to as "junk  bonds") are generally
rated BB or below by S&P, Duff or Fitch, or Ba by Moody's.

         Investment strategy. All of the Portfolios,  except the U.S. Government
         Securities,  Equity Index,  Small Company Index and U.S. Treasury Index
         Portfolios,   may   invest  up  to  15%  of  their   total   assets  in
         non-investment  grade  securities  when the investment  management team
         determines   that  such  securities  are  desirable  in  light  of  the
         Portfolios' investment objectives and portfolio mix.

         Special risks.  Non-investment  grade securities are subject to greater
         risk  than  investment  grade  securities.  The  market  value of these
         low-rated securities tends to be more sensitive to individual corporate
         developments and changes in interest rates and economic conditions than
         higher-rated  securities.  In addition, they generally present a higher
         degree of credit risk. Issuers of low-rated securities are often highly
         leveraged,  so their  ability to repay  their debt  during an  economic
         downturn or periods of rising interest rates may be impaired.  The risk
         of loss  due to  default  by  these  issuers  is also  greater  because
         low-rated securities generally are unsecured and are often subordinated
         to the rights of other creditors of the issuers of such securities.

         The secondary  market for lower quality  securities is  concentrated in
         relatively  few  market  makers  and  is  dominated  by   institutional
         investors. Accordingly, the secondary market for such securities is not
         as liquid as,  and is more  volatile  than,  the  secondary  market for
         higher quality securities. In addition, market trading volume for these
         securities  is  generally  lower  and the  secondary  market  for  such
         securities could contract under adverse market or economic  conditions,
         independent  of any  specific  adverse  changes in the  condition  of a
         particular  issuer.  These  factors  may have an adverse  effect on the
         market  price  and a  Portfolio's  ability  to  dispose  of  particular
         portfolio investments.  A less developed secondary market may also make
         it more difficult for a Portfolio to obtain  precise  valuations of the
         high yield securities in its portfolio.

         Investments in lower quality securities, whether rated or unrated, will
         be more  dependent on the  Investment  Adviser's  credit  analysis than
         would be the case with investments in higher quality securities.

Small Company Investments. Investments in small capitalization companies involve
greater  risk  and  portfolio  price   volatility  than  investments  in  larger
capitalization  stocks.  Among the reasons for the greater  price  volatility of
these investments are the less certain growth prospects of smaller firms and the
lower  degree  of  liquidity   in  the  markets  for  such   securities.   Small
capitalization  companies  may be  thinly  traded  and may  have to be sold at a
discount from current market prices or in small lots over an extended  period of
time. Because of the lack of sufficient market liquidity,  a Portfolio may incur
losses because it will be required to effect sales at a disadvantageous time and
only then at a substantial drop in price. Small capitalization companies include
"unseasoned"  issuers that do not have an established  financial history;  often
have limited product lines, markets or financial resources; may depend on or use
a few key personnel for  management;  and may be susceptible to losses and risks
of bankruptcy.  Transaction  costs for these  investments  are often higher than
those of larger  capitalization  companies.  Investments in small capitalization
companies  may be  more  difficult  to  price  precisely  than  other  types  of
securities because of their characteristics and lower trading volumes.

Temporary   Investments.   Short-term   obligations  refer  to  U.S.  government
securities,  high-quality money market instruments  (including  commercial paper
and  obligations of foreign and domestic banks such as  certificates of deposit,
bank and  deposit  notes,  bankers'  acceptances  and fixed time  deposits)  and
repurchase agreements with maturities of 13 months or less.
Generally, these obligations are purchased to provide stability and liquidity to
a Portfolio.

         Investment  strategy.  Each  Portfolio may invest all or any portion of
         its  assets  in  short-term  obligations  pending  investment,  to meet
         anticipated  redemption requests or as a temporary defensive measure in
         response to adverse market or economic  conditions (except for the U.S.
         Treasury  Index,  Equity Index,  Small Company Index and  International
         Equity  Index  Portfolios  which  generally  will not  invest  in these
         securities as part of a temporary defensive strategy to protect against
         potential stock market declines).

         Special  risks.  A Portfolio may not achieve its  investment  objective
when its assets are invested in short-term obligations.

Portfolio  Turnover.  The  investment  management  team  will not  consider  the
portfolio  turnover rate a limiting factor in making investment  decisions for a
Portfolio.  A high rate of portfolio  turnover (100% or more) may involve higher
brokerage  commissions  and  other  transaction  costs,  which  could  reduce  a
Portfolio's  return. It may also result in higher short-term  capital gains that
are taxable to  shareholders.  See "Financial  Information"  for the Portfolios'
historical  portfolio turnover rates. The Trust expects that the annual turnover
rate of the  MarketCommand,  Mid Cap Growth and Small Company Growth  Portfolios
will generally not exceed 150%, 125% and 200%, respectively.

Maturity  Risk.  Each  Fixed  Income   Portfolio  will  normally   maintain  the
dollar-weighted  average  maturity of its  portfolio  within a specified  range.
However,  the maturities of certain  instruments,  such as variable and floating
rate instruments, are subject to estimation. In addition, in calculating average
weighted  maturities,  the maturity of asset-backed  securities will be based on
estimates of average life. As a result,  the  Portfolios  cannot  guarantee that
these estimates will, in fact, be accurate or that their average maturities will
remain within their specified limits.

     Investment strategy. Under normal market conditions, the Investment Adviser
expects the  quarterly  performance  of the Index  Portfolios to be within a .95
correlation with their respective benchmarks, before expenses.

         Special risks. The Index Portfolios are subject to the risk of tracking
         variance.  Tracking  variance  may  result  from  share  purchases  and
         redemptions,  transaction costs, expenses and other factors.  These may
         prevent a Portfolio from achieving its investment objective.

ADDITIONAL DESCRIPTION OF SECURITIES AND COMMON INVESTMENT TECHNIQUES.

Asset-Backed Securities.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  They  represent  interests in pools of mortgages or other  cash-flow
producing  assets such as automobile  loans,  credit card  receivables and other
financial  assets.  In effect,  these  securities  "pass  through"  the  monthly
payments that  individual  borrowers make on their mortgages or other assets net
of any fees paid to the issuers.  Examples of these include guaranteed  mortgage
pass-through certificates, collateralized mortgage obligations ("CMOs") and real
estate mortgage investment conduits ("REMICs").

     Tracking Risk. The Equity Index, Small Company Index,  International Equity
Index and U.S. Treasury Index Portfolios (the "Index  Portfolios") seek to track
the performance of their respective benchmark indices.



<PAGE>



         Investment strategy.  The Short-Intermediate  Bond, Bond,  Intermediate
         Bond,  International Bond and Balanced  Portfolios may purchase various
         types  of  asset-backed  securities.  The  U.S.  Government  Securities
         Portfolio may only purchase mortgage-backed  securities that are issued
         by an agency  of the U.S.  Government.  The  Portfolios  will  normally
         invest in asset-backed  securities rated investment grade (rated BBB or
         better by S&P, Duff or Fitch,  or Baa or better by Moody's) at the time
         of purchase. The Portfolios may also invest in unrated  mortgage-backed
         securities  which the  Investment  Adviser  believes are of  comparable
         quality.  The Portfolios  will not purchase  non-mortgage  asset-backed
         securities that are unrated by S&P, Duff, Fitch or Moody's.

         Special  risks.  In  addition to credit and market  risk,  asset-backed
         securities  involve  prepayment  risk  because  the  underlying  assets
         (loans) may be prepaid at any time.  The value of these  securities may
         also   change   because   of  actual  or   perceived   changes  in  the
         creditworthiness of the originator,  the servicing agent, the financial
         institution  providing the credit support,  or the  counterparty.  Like
         other fixed income  securities,  when interest rates rise, the value of
         an asset-backed security generally will decline. However, when interest
         rates decline,  the value of an  asset-backed  security with prepayment
         features  may not  increase  as much as  that  of  other  fixed  income
         securities.  In addition,  non-mortgage asset-backed securities involve
         certain risks not presented by mortgage-backed  securities.  Primarily,
         these securities do not have the benefit of the same security  interest
         in the underlying  collateral.  Credit card  receivables  are generally
         unsecured,  and the debtors are entitled to the  protection of a number
         of state and Federal consumer credit laws.  Automobile  receivables are
         subject to the risk that the trustee for the holders of the  automobile
         receivables may not have an effective  security  interest in all of the
         obligations backing the receivables.

Borrowings and Reverse  Repurchase  Agreements.  The Portfolios may borrow money
from banks and enter into  reverse  repurchase  agreements  with banks and other
financial  institutions.  Reverse  repurchase  agreements  involve  the  sale of
securities  held  by  a  Portfolio  subject  to  the  Portfolio's  agreement  to
repurchase them at a mutually agreed upon date and price  (including  interest).

         Investment  strategy.  Each Portfolio may borrow and enter into reverse
         repurchase  agreements in amounts not exceeding  one-third of its total
         assets (including the amount borrowed).  Each Portfolio may also borrow
         up to an additional 5% of its total assets for temporary purposes.  The
         Portfolios  may  enter  into  reverse  repurchase  agreements  when the
         investment  management  team  expects  that the  interest  income to be
         earned from the investment of the transaction  proceeds will be greater
         than the related interest expense.

         Special risks.  Borrowings and reverse  repurchase  agreements  involve
         leveraging.  If the securities held by the Portfolios  decline in value
         while these  transactions are  outstanding,  the net asset value of the
         Portfolios' outstanding shares will decline in value by proportionately
         more than the decline in value of the securities. In addition,  reverse
         repurchase agreements involve the risks that the interest income earned
         by a Portfolio  (from the investment of the proceeds) will be less than
         the interest expense of the  transaction,  that the market value of the
         securities  sold by a  Portfolio  will  decline  below  the  price  the
         Portfolio is obligated to pay to repurchase  the  securities,  and that
         the securities may not be returned to the Portfolio.

Convertible Securities. A convertible security is a bond or preferred stock that
may be converted (exchanged) into the common stock of the issuing company within
a  specified  time  period  for a  specified  number of  shares.  They offer the
Portfolios a way to participate in the capital  appreciation of the common stock
into which the securities are  convertible,  while earning higher current income
than is available from the common stock.

         Investment strategy.  The Short-Intermediate  Bond, Bond,  Intermediate
         Bond, International Bond, Balanced, Diversified Growth, Focused Growth,
         Small  Company  Growth,  Mid Cap Growth,  MarketCommand,  International
         Growth and  International  Equity  Index  Portfolios  may each  acquire
         convertible securities. These securities are subject to the same rating
         requirements as fixed income securities held by a Portfolio.

Custodial   Receipts   for   Treasury   Securities.   Custodial   receipts   are
participations in trusts that hold U.S.  Treasury  securities and are sold under
names such as TIGRs and CATS. Like other stripped obligations,  they entitle the
holder to future interest or principal payments on the U.S. Treasury securities.

         Investment  strategy.  To the extent  consistent with their  respective
         investment  objectives,  the  Portfolios  may invest a portion of their
         assets in custodial receipts.  The U.S. Government  Securities and U.S.
         Treasury Index Portfolios will not invest more than 35% of the value of
         their total assets in custodial receipts.

         Special risks. Like other stripped obligations,  custodial receipts may
         be subject to greater price  volatility than ordinary debt  obligations
         because of the way in which their  principal  and interest are returned
         to investors.

Equity Swaps.  Equity swaps allow the parties to the swap  agreement to exchange
components  of  return  on one  equity  investment  (e.g.,  a basket  of  equity
securities  or an index)  for a  component  of return on another  non-equity  or
equity investment, including an exchange of differential rates of return.

         Investment  strategy.  The Balanced Portfolio and the Equity Portfolios
         may  invest in equity  swaps.  Equity  swaps may be used to invest in a
         market  without  owning or taking  physical  custody of  securities  in
         circumstances  where  direct  investment  may be  restricted  for legal
         reasons or is otherwise impractical.  Equity swaps may also be used for
         other purposes, such as hedging or seeking to increase total return.

         Special risks. Equity swaps are derivative instruments and their values
         can be very volatile. To the extent that the investment management team
         does  not  accurately   analyze  and  predict  the  potential  relative
         fluctuation on the components swapped with the other party, a Portfolio
         may suffer a loss. The value of some components of an equity swap (such
         as the dividends on a common stock) may also be sensitive to changes in
         interest rates. Furthermore, during the period a swap is outstanding, a
         Portfolio may suffer a loss if the counterparty defaults.

     Exchange  Rate-Related   Securities.   Exchange   rate-related   securities
represent  certain foreign debt obligations whose principal values are linked to
a foreign currency but which are repaid in U.S. dollars.

         Investment strategy.  The Short-Intermediate  Bond, Bond,  Intermediate
Bond,  International  Bond  and  Balanced  Portfolios  may  invest  in  exchange
rate-related securities.

         Special  risks.  The  principal  payable  on an  exchange  rate-related
         security  is subject to  currency  risk.  In  addition,  the  potential
         illiquidity and high volatility of the foreign exchange market may make
         exchange rate-related securities difficult to sell prior to maturity at
         an appropriate price.

Forward Currency Exchange Contracts.  A forward currency exchange contract is an
obligation  to exchange one currency for another on a future date at a specified
exchange rate.

         Investment strategy.  The Short-Intermediate  Bond, Bond,  Intermediate
         Bond, International Bond, Balanced, Diversified Growth, Focused Growth,
         Small  Company  Growth,  Mid Cap Growth,  MarketCommand,  International
         Growth and International Equity Index Portfolios may enter into forward
         currency exchange contracts for hedging purposes and to help reduce the
         risks and  volatility  caused by changes in foreign  currency  exchange
         rates. The International  Bond and International  Growth Portfolios may
         also enter into these  contracts for  speculative  purposes  (i.e.,  to
         increase total return) or for cross-hedging purposes.  Foreign currency
         exchange  contracts  will be used at the  discretion of the  investment
         management  team,  and no  Portfolio  is  required to hedge its foreign
         currency positions.

         Special  risks.   Forward  foreign  currency  contracts  are  privately
         negotiated transactions,  and can have substantial price volatility. As
         a result, they offer less protection against default by the other party
         than is available for instruments traded on an exchange.  When used for
         hedging  purposes,  they tend to limit any  potential  gain that may be
         realized  if the  value of a  Portfolio's  foreign  holdings  increases
         because of currency  fluctuations.  When used for speculative purposes,
         forward currency exchange contracts may result in losses that would not
         otherwise be incurred.

Futures  Contracts  and  Related  Options.  A  futures  contract  is a  type  of
derivative  instrument  that obligates the holder to buy or sell an asset in the
future at an agreed upon price.  For example,  a futures contract may obligate a
Portfolio,  at maturity, to take or make delivery of certain domestic or foreign
securities,  the cash  value of a  securities  index or a stated  quantity  of a
foreign currency. When a Portfolio purchases an option on a futures contract, it
has the  right to  assume a  position  as a  purchaser  or  seller  of a futures
contract  at a  specified  exercise  price  during  the  option  period.  When a
Portfolio  sells an  option on a  futures  contract,  it  becomes  obligated  to
purchase or sell a futures contract if the option is exercised.

         Investment strategy. Each Portfolio may invest in futures contracts and
         options on futures contracts on domestic or foreign exchanges or boards
         of trade.  They may be used for hedging  purposes,  to  increase  total
         return  or  to  maintain   liquidity  to  meet  potential   shareholder
         redemptions,  invest cash  balances or  dividends  or minimize  trading
         costs.

         The value of a  Portfolio's  futures  contracts may equal up to 100% of
         its total  assets.  However,  a Portfolio  will not  purchase or sell a
         futures  contract  unless,  after  the  transaction,  the  sum  of  the
         aggregate amount of margin deposits on its existing  futures  positions
         and  the  amount  of  premiums  paid  for  related   options  used  for
         non-hedging purposes is 5% or less of its total assets.

         Special  risks.  Futures  contracts  and options  present the following
         risks:  imperfect  correlation  between the change in market value of a
         Portfolio's  securities and the price of futures contracts and options;
         the possible inability to close a futures contract when desired; losses
         due to unanticipated market movements which are potentially  unlimited;
         and  the  possible  inability  of the  investment  management  team  to
         correctly predict the direction of securities  prices,  interest rates,
         currency exchange rates and other economic  factors.  Foreign exchanges
         or boards of trade generally do not offer the same  protections as U.S.
         exchanges.

Illiquid  or  Restricted  Securities.  Illiquid  securities  include  repurchase
agreements  and time deposits with  notice/termination  dates of more than seven
days,  certain  variable amount master demand notes that cannot be called within
seven days, certain insurance funding  agreements (see below),  certain unlisted
over-the-counter  options and other  securities  that are traded in the U.S. but
are subject to trading  restrictions  because they are not registered  under the
Securities Act of 1933, as amended (the "1933 Act").

         Investment  strategy.  Each  Portfolio  may invest up to 15% of its net
         assets in securities  that are illiquid.  If otherwise  consistent with
         their investment  objectives and policies,  the Portfolios may purchase
         commercial  paper  issued  pursuant to Section 4(2) of the 1933 Act and
         domestically  traded  securities that are not registered under the 1933
         Act but can be sold to "qualified  institutional  buyers" in accordance
         with  Rule 144A  under the 1933 Act  ("Rule  144A  Securities").  These
         securities  will not be considered  illiquid so long as the  Investment
         Advisers  determine,  under guidelines approved by the Trust's Board of
         Trustees, that an adequate trading market exists.

         Special  risks.  Because  illiquid  and  restricted  securities  may be
         difficult  to sell at an  acceptable  price,  they  may be  subject  to
         greater  volatility  and  may  result  in a loss  to a  Portfolio.  The
         practice of investing in Rule 144A Securities  could increase the level
         of  a  Portfolio's   illiquidity   during  any  period  that  qualified
         institutional   buyers  become   uninterested   in   purchasing   these
         securities.

Insurance  Funding  Agreements.  An insurance  funding  agreement  ("IFA") is an
agreement that requires a Portfolio to make cash contributions to a deposit fund
of an insurance  company's  general account.  The insurance company then credits
interest to the Portfolio for a set time period.

         Investment Strategy.  The Short-Intermediate  Bond, Bond,  Intermediate
         Bond and  Balanced  Portfolios  may invest in IFAs issued by  insurance
         companies  that meet quality and credit  standards  established  by the
         Investment Advisers.

         Special risks.  IFAs are not insured by a government  agency--they  are
         backed only by the  insurance  company that issues  them.  As a result,
         they are subject to default  risk.  In  addition,  an active  secondary
         market in IFAs does not  currently  exist.  This  means  that it may be
         difficult to sell an IFA at an appropriate price.

Interest  Rate Swaps,  Floors and Caps and  Currency  Swaps.  Interest  rate and
currency  swaps are  contracts  that  obligate a Portfolio  and another party to
exchange  their  rights to pay or  receive  interest  or  specified  amounts  of
currency,  respectively.  Interest rate floors entitle the purchasers to receive
interest  payments if a specified  index  falls below a  predetermined  interest
rate.  Interest rate caps entitle the purchasers to receive interest payments if
a specified index exceeds a predetermined interest rate.

         Investment  strategy.  The Fixed  Income  Portfolios  (except  the U.S.
         Treasury  Index  Portfolio)  and the Balanced  Portfolio may enter into
         interest  rate  swaps  and  purchase  interest  rate  floors or caps to
         protect  against  interest rate  fluctuations  and  fluctuations in the
         floating rate market. The International Bond,  International Growth and
         International  Equity Index Portfolios may enter into currency swaps to
         protect against currency fluctuations.

         Special risks. If the other party to an interest rate swap defaults,  a
         Portfolio's  risk of loss  consists of the amount of interest  payments
         that the Portfolio is entitled to receive. In contrast,  currency swaps
         usually  involve  the  delivery  of the entire  principal  value of one
         currency  in exchange  for the other  currency.  Therefore,  the entire
         principal  value of a  currency  swap is  subject  to the risk that the
         other  party  will  default  on its  delivery  obligations.  Like other
         derivative  securities,  swaps, floors and caps can be highly volatile.
         As a result,  they may not always be  successful  hedges and they could
         lower a Portfolio's total return.

Investment Companies.  To the extent consistent with their respective investment
objectives and policies, the Portfolios may invest in securities issued by other
investment companies, including money market funds, index funds, "country funds"
(i.e.,  funds that invest  primarily  in issuers  located in a specific  foreign
country or region),  World Equity Benchmark SharesSM issued by The Foreign Fund,
Inc.  ("WEBS"),  S&P's Depository  Receipts  ("SPDRs") and similar securities of
other issuers.

         Investment  strategy.  Investments  by a Portfolio in other  investment
         companies will be subject to the limitations of the 1940 Act.  Although
         the Portfolios do not expect to do so in the foreseeable  future,  each
         Portfolio is authorized to invest  substantially all of its assets in a
         single  open-end   investment   company  or  series  thereof  that  has
         substantially the same investment  objective,  policies and fundamental
         restrictions as the Portfolio.

         Special  risks.  As a  shareholder  of another  investment  company,  a
         Portfolio  would be subject to the same risks as any other  investor in
         that company.  In addition,  it would bear a proportionate share of any
         fees and expenses paid by that  company.  These would be in addition to
         the advisory and other fees paid directly by the Portfolio.

     Options. An option is a type of derivative instrument that gives the holder
the right (but not the  obligation) to buy (a "call") or sell (a "put") an asset
in the  future at an  agreed  upon  price  prior to the  expiration  date of the
option.

         Investment  strategy.  Each  Portfolio  may write  (sell)  covered call
         options,  buy put  options,  buy call  options  and write  secured  put
         options for hedging (or  cross-hedging)  purposes or to earn additional
         income.  Options  may  relate  to  particular  securities,  foreign  or
         domestic   securities   indices,   financial   instruments  or  foreign
         currencies.  A Portfolio  will not  purchase put and call options in an
         amount that exceeds 5% of its net assets at the time of  purchase.  The
         total value of a Portfolio's  assets subject to options  written by the
         Portfolio  will not be  greater  than 25% of its net assets at the time
         the option is written.  A Portfolio may "cover" a call option by owning
         the security  underlying the option or through other means. Put options
         written by a Portfolio are "secured" if the Portfolio  maintains liquid
         assets in a  segregated  account  in an  amount  at least  equal to the
         exercise price of the option up until the expiration date.

         Special risks.  Options trading is a highly  specialized  activity that
         involves   investment   techniques  and  risks   different  from  those
         associated with ordinary portfolio securities  transactions.  The value
         of options can be highly volatile,  and their use can result in loss if
         the investment management team is incorrect in its expectation of price
         fluctuations.  The successful use of options for hedging  purposes also
         depends in part on the  ability of the  investment  management  team to
         predict future price fluctuations and the degree of correlation between
         the options and securities markets.

         Each  Portfolio  will  invest  and trade in  unlisted  over-the-counter
         options only with firms deemed creditworthy by the Investment Advisers.
         However,  unlisted options are not subject to the protections  afforded
         purchasers of listed options by the Options Clearing Corporation, which
         performs the  obligations  of its members which fail to perform them in
         connection with the purchase or sale of options.

Real Estate Investment Trusts (REITS). REITs are pooled investment vehicles that
invest primarily in either real estate or real estate related loans.

     Investment  Strategy.  The Small  Company  Index and Small  Company  Growth
Portfolios may invest in REITs.

         Special Risks.  The value of a REIT is affected by changes in the value
         of the properties owned by the REIT or securing  mortgage loans held by
         the REIT. REITs are dependent upon cash flow from their  investments to
         repay financing  costs and the ability of a REIT's  manager.  REITs are
         also subject to risks  generally  associated  with  investments in real
         estate.  The Portfolio will indirectly bear its proportionate  share of
         any expenses,  including  management  fees,  paid by a REIT in which it
         invests.

     Repurchase  Agreements.  Repurchase  agreements  involve  the  purchase  of
securities by a Portfolio  subject to the seller's  agreement to repurchase them
at a mutually agreed upon date and price.

         Investment   strategy.   Each  Portfolio  may  enter  into   repurchase
         agreements with financial institutions such as banks and broker-dealers
         that are deemed to be creditworthy by the Investment Advisers. Although
         the securities  subject to a repurchase  agreement may have  maturities
         exceeding one year,  settlement of the agreement  will never occur more
         than one year after a Portfolio acquires the securities.

         Special  risks.  In the event of a default,  a Portfolio  will suffer a
         loss to the extent that the  proceeds  from the sale of the  underlying
         securities and other  collateral are less than the repurchase price and
         the  Portfolio's  costs  associated  with delay and  enforcement of the
         repurchase  agreement.  In  addition,  in the  event of  bankruptcy,  a
         Portfolio could suffer additional losses if a court determines that the
         Portfolio's interest in the collateral is not enforceable.

Securities  Lending.  In order to generate additional income, the Portfolios may
lend  securities  on a  short-term  basis to  banks,  brokers-dealers,  or other
qualified  institutions.  In exchange,  the Portfolios  will receive  collateral
equal to at least 100% of the value of the securities loaned.

         Investment  strategy.  Securities  lending may  represent  no more than
         one-third the value of a Portfolio's  total assets  (including the loan
         collateral).  Any cash collateral received by a Portfolio in connection
         with these  loans may be  invested in U.S.  government  securities  and
         other liquid high-grade debt obligations.

         Special risks. The main risk when lending portfolio  securities is that
         the borrower  might become  insolvent or refuse to honor its obligation
         to return the securities.  In this event, a Portfolio could  experience
         delays in recovering  its  securities  and may incur a capital loss. In
         addition,  a  Portfolio  may  incur  a loss  in  reinvesting  the  cash
         collateral it receives.

Stripped  Obligations.  These  securities are issued by the U.S.  government (or
agency or instrumentality), foreign governments or banks and other issuers. They
entitle the holder to receive  either  interest  payments or principal  payments
that have been  "stripped" from a debt  obligation.  These  obligations  include
stripped mortgage-backed  securities,  which are derivative multi-class mortgage
securities.

         Investment  strategy.  The Fixed  Income and  Balanced  Portfolios  may
purchase stripped securities.



<PAGE>


         Special  risks.  Stripped  securities  are very sensitive to changes in
         interest  rates and to the rate of  principal  prepayments.  A rapid or
         unexpected increase in mortgage  prepayments could severely depress the
         price of certain  stripped  mortgage-backed  securities  and  adversely
         affect a Portfolio's total returns.

Structured  Securities.  The value of the  principal of and/or  interest on such
securities  is  determined  by  reference  to changes  in the value of  specific
currencies,  interest rates, commodities,  indices or other financial indicators
(the "Reference") or the relative change in two or more References. The interest
rate  or the  principal  amount  payable  upon  maturity  or  redemption  may be
increased or decreased depending upon changes in the applicable Reference.

         Investment strategy. Each Portfolio may invest in structured securities
to the extent consistent with its investment objective.

         Special risks. The terms of some structured securities may provide that
         in  certain   circumstances  no  principal  is  due  at  maturity  and,
         therefore,  a Portfolio  could  suffer a total loss of its  investment.
         Structured  securities may be positively or negatively indexed, so that
         appreciation  of the  Reference  may produce an increase or decrease in
         the interest  rate or value of the  security at maturity.  In addition,
         changes in the interest  rates or the value of the security at maturity
         may  be  a  multiple  of  changes  in  the  value  of  the   Reference.
         Consequently,  structured  securities  may  entail a greater  degree of
         market risk than other types of securities.  Structured  securities may
         also be more  volatile,  less liquid and more  difficult to  accurately
         price than less complex securities due to their derivative nature.

United States Government  Obligations.  These include U.S. Treasury obligations,
such as bills,  notes and bonds,  which generally  differ only in terms of their
interest rates, maturities and time of issuance.  These also include obligations
issued   or   guaranteed   by  the  U.S.   government   or  its   agencies   and
instrumentalities.  Securities  guaranteed  as to principal  and interest by the
U.S.  government,  its agencies or  instrumentalities  are deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of  credit  issued  by the U.S.  government  or an agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         Investment  strategy.  To the  extent  consistent  with its  investment
         objective,  each  Portfolio  may invest in a variety  of U.S.  Treasury
         obligations.  With the exception of the U.S.  Treasury Index Portfolio,
         each Portfolio  also may invest in obligations  issued or guaranteed by
         the U.S. government or its agencies and instrumentalities.

         Special  risks.  Not all U.S.  government  obligations  carry  the same
         guarantees.  Some,  such as those of the Government  National  Mortgage
         Association ("GNMA"), are supported by the full faith and credit of the
         United States Treasury. Other obligations, such as those of the Federal
         Home Loan  Banks,  are  supported  by the right of the issuer to borrow
         from the United States  Treasury;  and others,  such as those issued by
         the Federal National Mortgage  Association  ("FNMA"),  are supported by
         the  discretionary  authority  of the U.S.  government  to purchase the
         agency's obligations.  Still others are supported only by the credit of
         the instrumentality. No assurance can be given that the U.S. government
         would provide financial support to its agencies or instrumentalities if
         it is not obligated to do so by law.  There is no assurance  that these
         commitments  will be  undertaken  or complied  with in the  future.  In
         addition, the secondary market for certain participations in loans made
         to foreign governments or their agencies may be limited.

Variable and Floating Rate  Instruments.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at  a  margin  above  a  generally  recognized  index  rate.  These
instruments include variable amount master demand notes,  long-term variable and
floating  rate  bonds  (sometimes  referred  to as "Put  Bonds")  where the Fund
obtains at the time of purchase  the right to put the bond back to the issuer or
a third party at par at a specified  date and  leveraged  inverse  floating rate
instruments ("inverse floaters").  An inverse floater is leveraged to the extent
that its  interest  rate  varies by an amount  that  exceeds  the  amount of the
variation in the index rate of interest.

         Investment  strategy.  Each  Portfolio  may invest in rated and unrated
         variable and floating rate  instruments to the extent  consistent  with
         its investment  objective.  Unrated  instruments  may be purchased by a
         Portfolio if they are  determined by the  Investment  Advisers to be of
         comparable  quality to rated  instruments  eligible for purchase by the
         Portfolio.

         Special  risks.  The market  values of inverse  floaters are subject to
         greater  volatility  than other variable and floating rate  instruments
         due to their  higher  degree of  leverage.  Because  there is no active
         secondary  market for certain  variable and floating rate  instruments,
         they  may be  more  difficult  to sell if the  issuer  defaults  on its
         payment  obligations  or during  periods  when the  Portfolios  are not
         entitled to exercise their demand rights.  As a result,  the Portfolios
         could suffer a loss with respect to these instruments.

     Warrants.  A warrant  represents  the right to  purchase  a  security  at a
predetermined price for a specified period of time.

         Investment strategy. The Balanced,  Diversified Growth, Focused Growth,
         International   Growth,   Small   Company   Growth,   Mid  Cap  Growth,
         MarketCommand,  Small  Company  Index and  International  Equity  Index
         Portfolios  may  invest up to 5% of their  total  assets at the time of
         purchase in warrants and similar rights.  A Portfolio may also purchase
         bonds that are issued in tandem with warrants.

         Special risks.  Warrants are derivative  instruments that present risks
similar to options.

When-Issued Securities, Delayed Delivery Transactions and Forward Commitments. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

         Investment strategy.  Each Portfolio may purchase or sell securities on
         a when-issued,  delayed-delivery or forward commitment basis.  Although
         the   Portfolios   would   generally   purchase   securities  in  these
         transactions  with the  intention  of  acquiring  the  securities,  the
         Portfolios  may dispose of such  securities  prior to settlement if the
         investment management team deems it appropriate to do so.

         Special risks. Purchasing securities on a when-issued, delayed delivery
         or forward  commitment  basis  involves  the risk that the value of the
         securities  may  decrease  by the time  they  are  actually  issued  or
         delivered.   Conversely,   selling  securities  in  these  transactions
         involves the risk that the value of the  securities may increase by the
         time they are actually  issued or delivered.  These  transactions  also
         involve  the risk that the seller may fail to deliver  the  security or
         cash on the settlement date.

Zero Coupon,  Pay-In-Kind and Capital  Appreciation  Bonds. These are securities
issued at a  discount  from  their  face value  because  interest  payments  are
typically postponed until maturity.  Interest payments on pay-in-kind securities
are payable by the delivery of additional securities. The amount of the discount
rate varies  depending on factors  such as the time  remaining  until  maturity,
prevailing  interest  rates,  a security's  liquidity  and the  issuer's  credit
quality.  These  securities  also may take the form of debt securities that have
been stripped of their interest payments.

         Investment  strategy.   Each  Portfolio  may  invest  in  zero  coupon,
pay-in-kind  and capital  appreciation  bonds to the extent  consistent with its
investment objective.

         Special  risks.  The  market  prices of zero  coupon,  pay-in-kind  and
         capital  appreciation bonds generally are more volatile than the market
         prices of  interest-bearing  securities  and are likely to respond to a
         greater  degree to changes  in  interest  rates  than  interest-bearing
         securities having similar  maturities and credit quality. A Portfolio's
         investments in zero coupon,  pay-in-kind and capital appreciation bonds
         may require the Portfolio to sell some of its  portfolio  securities to
         generate   sufficient  cash  to  satisfy  certain  income  distribution
         requirements.

DISCLAIMERS

The U.S. Treasury Index Portfolio is not sponsored,  endorsed,  sold or promoted
by Lehman,  nor does Lehman  guarantee the accuracy  and/or  completeness of the
Lehman Index or any data included therein. Lehman makes no warranty,  express or
implied,  as to the  results  to be  obtained  by the  Portfolio,  owners of the
Portfolio, any person or any entity from the use of the Lehman Index or any data
included  therein.  Lehman makes no express or implied  warranties and expressly
disclaims  all such  warranties of  merchantability  or fitness for a particular
purpose or use with respect to the Lehman Index or any data included therein.

The Equity Index Portfolio is not sponsored,  endorsed, sold or promoted by S&P,
nor does S&P guarantee the accuracy and/or  completeness of the S&P 500(R) Index
or any data included therein.  S&P makes no warranty,  express or implied, as to
the results to be obtained by the Portfolio, owners of the Portfolio, any person
or any entity from the use of the S&P 500(R) Index or any data included therein.
S&P makes no express or implied  warranties  and  expressly  disclaims  all such
warranties of  merchantability  or fitness for a particular purpose for use with
respect to the S&P 500(R) Index or any data included therein.

The  International  Equity Index Portfolio is not sponsored,  endorsed,  sold or
promoted by MSCI, nor does MSCI guarantee the accuracy  and/or  completeness  of
the EAFE Index or any data included therein. MSCI makes no warranty,  express or
implied,  as to the  results  to be  obtained  by the  Portfolio,  owners of the
Portfolio,  any person or any entity  from the use of the EAFE Index or any data
included  therein.  MSCI makes no express or implied  warranties  and  expressly
disclaims  all such  warranties of  merchantability  or fitness for a particular
purpose for use with respect to the EAFE Index or any data included therein.

The Small Company Index Portfolio is not sponsored,  endorsed,  sold or promoted
by Russell,  nor does Russell guarantee the accuracy and/or  completeness of the
Russell  2000 Index or any data  included  therein.  Russell  makes no warranty,
express or implied, as to the results to be obtained by the Portfolio, owners of
the  Portfolio,  any person or any entity from the use of the Russell 2000 Index
or any data included therein. Russell makes no express or implied warranties and
expressly  disclaims  all such  warranties of  merchantability  or fitness for a
particular  purpose for use with  respect to the Russell  2000 Index or any data
included therein.

                              FINANCIAL INFORMATION

The  financial   highlights  tables  are  intended  to  help  you  understand  a
Portfolio's  financial  performance for the past five years (or, if shorter, the
period of the Portfolio's  operations).  Certain information  reflects financial
results for a single  Portfolio share. The total returns in the tables represent
the rate  that an  investor  would  have  earned or lost on an  investment  in a
Portfolio  (assuming  reinvestment  of all  dividends  and  distributions).  The
information  for the years or periods  ended on or before  November 30, 1999 has
been audited by  _________________,  whose report is included in the Portfolios'
annual report along with the Portfolios' financial statements.



<PAGE>



Financial Highlights [TO BE UPDATED]
U.S. Government Securities Portfolio
For the Years Ended November 30,
<TABLE>
<CAPTION>
<S><C>                                            <C>           <C>         <C>       <C>          <C>       <C>

                                                                                Class A
                                                 ----------------------------------------------------------------------
                                                    For the
                                                  Six Months    For the    For the    For the    For the     For the
                                                     Ended    Year Ended Year Ended Year Ended  Year Ended Year Ended
                                                 May 31, 1999    1998       1997       1996        1995       1994

Net asset value, beginning of  period               $20.27      $19.99      $20.07     $20.08     $19.05      $20.07
Income (loss) from investment operations:
   Net investment income                              0.49        1.17        1.21       1.02       1.05        0.91
   Net realized and unrealized gain (loss)           (0.34)       0.26       (0.07)     (0.01)      1.02       (1.02)
Total income (loss) from investment operations        0.15        1.43        1.14       1.01       2.07       (0.11)
Distributions to shareholders from:
   Net investment income                             (0.49)      (1.15)      (1.22)     (1.02)     (1.04)      (0.91)
   Net realized gain                                 (0.29)       --         --         --         --          --
   Return of capital                                  --          --         --         --         --          --
Total distributions to shareholders                  (0.78)      (1.15)      (1.22)     (1.02)     (1.04)      (0.91)
Net increase (decrease)                              (0.63)       0.28       (0.08)     (0.01)      1.03       (1.02)
Net asset value, end of period                      $19.64      $20.27      $19.99     $20.07     $20.08      $19.05
Total return (a)                                      0.68%       7.36%       5.93%      5.15%     11.18%      (0.57)%
Ratio to average net assets of (b):
   Expenses, before waivers and reimbursements        0.79%       0.86%       0.85%      0.94%      1.09%       1.12%
   Expenses, net of waivers and reimbursements        0.36%       0.36%       0.36%      0.36%      0.36%       0.36%
   Net investment income, before waivers and
      reimbursements                                  4.79%       5.51%       5.37%      4.64%      4.70%       3.86%
   Net investment income, net of waivers and
      reimbursements                                  5.22%       6.01%       5.86%      5.22%      5.43%       4.62%
Portfolio turnover rate                              26.31%     115.55%      95.73%    119.75%    141.14%      45.55%
Net assets at end of period (in thousands)          $83,189     $48,317    $43,073    $92,351    $56,329     $25,293
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.

(b)   Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
U.S. Government Securities Portfolio
For the Years Ended November 30,
<TABLE>
<CAPTION>
<S><C>                                     <C>          <C>          <C>       <C>

                                                              Class C
                                            ---------------------------------------------
                                              For the    For the    For the    For the
                                            Six Months Year Ended Year Ended Year Ended
                                            Ended 1999    1998      1997      1996 (a)

Net asset value, beginning of period          $20.26     $19.98     $20.06     $20.13
Income (loss) from investment operations:
   Net investment income                        0.03       1.12       1.14       0.91
   Net realized and unrealized gain (loss)      0.01       0.26      (0.04)     (0.12)
Total income (loss) from investment             0.04       1.38       1.10       0.79
operations
Distributions to shareholders from:
   Net investment income                       (0.08)     (1.10)     (1.18)     (0.86)
   Net realized gain                           (0.29)      --         --         --
   Return of capital                            --         --         --         --
Total distributions to shareholders            (0.37)     (1.10)     (1.18)     (0.86)
Net increase (decrease)                        (0.33)      0.28      (0.08)     (0.07)
Net asset value, end of period                $19.93 (b) $20.26     $19.98     $20.06
Total return (c)                                0.20%      7.10%      5.67%      4.05%
Ratio to average net assets of (d):
   Expenses, before waivers and                 1.03%      1.10%      1.09%      1.18%
reimbursements
   Expenses, net of waivers and                 0.60%      0.60%      0.60%      0.60%
reimbursements
   Net investment income, before waivers and
     reimbursements                             1.09%      5.27%      5.14%      4.39%
   Net investment income, net of waivers and
     reimbursements                             1.52%      5.77%      5.63%      4.97%
Portfolio turnover rate                        26.31%    115.55%     95.73%    119.75%
Net assets at end of period (in thousands)   $ ______    $3,942     $3,118     $3,535
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                        <C>            <C>       <C>        <C>       <C>          <C>

                                                                           Class D
                                            -----------------------------------------------------------------------
                                               For the
                                              Six Months    For the    For the   For the    For the     For the
                                                Ended     Year Ended Year Ended Year      Year Ended  Year Ended
                                             May 31, 1999    1998       1997    Ended 1996   1995      1994 (e)

Net asset value, beginning of period           $20.22       $19.94     $20.03     $20.04    $19.05      $19.43
Income (loss) from investment operations:
   Net investment income                         0.50         1.08       1.16       0.96      0.96        0.22
   Net realized and unrealized gain (loss)      (0.38)        0.28      (0.10)     (0.03)     1.00       (0.38)
Total income (loss) from investment              0.12         1.36       1.06       0.93      1.96       (0.16)
operations
Distributions to shareholders from:
   Net investment income                        (0.45)       (1.08)     (1.15)     (0.94)    (0.97)      (0.22)
   Net realized gain                            (0.29)        --         --        --         --          --
   Return of capital                             --           --         --        --         --          --
Total distributions to shareholders             (0.74)       (1.08)     (1.15)     (0.94)    (0.97)      (0.22)
Net increase (decrease)                         (0.62)        0.28      (0.09)     (0.01)     0.99       (0.38)
Net asset value, end of period                 $19.60       $20.22     $19.94     $20.03    $20.04      $19.05
Total return (c)                                 0.53%        6.96%      5.52%      4.77%    10.66%      (0.90)%
Ratio to average net assets of (d):
   Expenses, before waivers and                  1.18%        1.25%      1.24%      1.33%     1.48%       1.51%
reimbursements
   Expenses, net of waivers and                  0.75%        0.75%      0.75%      0.75%     0.75%       0.75%
reimbursements
   Net investment income, before waivers and
     reimbursements                              4.40%        5.05%      5.01%      4.25%     4.35%       3.89%
   Net investment income, net of waivers and
     reimbursements                              4.83%        5.55%      5.50%      4.83%     5.08%       4.65%
Portfolio turnover rate                         26.31%      115.55%     95.73%    119.75%   141.14%      45.55%
Net assets at end of period (in thousands)       $810       $1,224      $312       $225       $67         $13
</TABLE>

(a) For the  period  December  29,  1995  (Class C Shares  issue  date)  through
November  30,  1996.  (b) Class C shares were fully  redeemed as of February 10,
1999.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(d) Annualized for periods less than a full year.
(e) For the period  September  15,  1994  (Class D Shares  issue  date)  through
November 30, 1994.


<PAGE>



Financial Highlights [TO BE UPDATED]
Short-Intermediate Bond Portfolio
For the Years Ended November 30,

<TABLE>
<CAPTION>
<S><C>                                            <C>          <C>            <C>       <C>         <C>       <C>

                                                                                Class A
                                                ------------------------------------------------------------------------
                                                    For the
                                                  Six Months     For the     For the    For the    For the    For the
                                                     Ended      Year Ended Year Ended Year Ended Year Ended Year Ended
                                                 May 31, 1999      1998       1997       1996       1995       1994

Net asset value, beginning of period                $20.03        $20.36     $20.70      $20.73     $19.53     $20.33
Income (loss) from investment operations:
   Net investment income                              0.91          1.84       1.46        1.14       1.02       0.97
   Net realized and unrealized gain (loss)           (0.52)        (0.36)     (0.29)      (0.01)      1.19      (0.80)
Total income (loss) from investment operations        0.39          1.48       1.17        1.13       2.21       0.17
Distributions to shareholders from:
   Net investment income                             (0.84)        (1.78)     (1.46)      (1.16)     (1.01)     (0.97)
   Net realized gain                                 (0.27)        (0.03)     (0.05)      --         --         --
   Return of capital                                  --           --          --         --         --         --
Total distributions to shareholders                  (1.11)        (1.81)     (1.51)      (1.16)     (1.01)     (0.97)
Net increase (decrease)                              (0.72)        (0.33)     (0.34)      (0.03)      1.20      (0.80)
Net asset value, end of period                      $19.31        $20.03     $20.36      $20.70     $20.73     $19.53
Total return (a)                                      1.88%         7.50%      5.95%       5.68%     11.58%      0.84%
Ratio to average net assets of (b):
   Expenses, before waivers and
     reimbursements                                   0.77%         0.76%      0.81%       0.88%      0.91%      0.95%
   Expenses, net of waivers and
     reimbursements                                   0.36%         0.36%      0.36%       0.36%      0.36%      0.36%
   Net investment income, before
     waivers and reimbursements                       8.96%         9.21%      7.23%       5.31%      4.59%      4.25%
   Net investment income, net of
     waivers and reimbursements                       9.37%         9.61%      7.68%       5.83%      5.14%      4.84%
Portfolio turnover rate                              55.50%        89.97%     48.49%      47.68%     54.68%     48.67%
Net assets at end of period (in thousands)         $178,733      $182,999   $201,457    $153,675  $158,678    $96,209
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                               <C>            <C>       <C>         <C>        <C>       <C>

                                                                                 Class D
                                                 ------------------------------------------------------------------------
                                                     For the
                                                   Six Months     For the    For the    For the    For the    For the
                                                      Ended     Year Ended Year Ended Year Ended Year Ended  Year Ended
                                                 May 31, 1999(c)   1998       1997       1996       1995      1994 (d)

Net asset value, beginning of period                  $19.97      $20.31      $20.66     $20.71     $19.53     $19.82
Income (loss) from investment operations:
   Net investment income                                0.89        1.78        1.43       1.07       0.94       0.23
   Net realized and unrealized gain (loss)             (0.54)      (0.40)      (0.34)     (0.02)      1.18      (0.29)
Total income (loss) from investment operations          0.35        1.38        1.09       1.05       2.12      (0.06)
Distributions to shareholders from:
   Net investment income                               (0.79)      (1.69)      (1.39)     (1.10)     (0.94)     (0.23)
   Net realized gain                                   (0.27)      (0.03)      (0.05)     --         --         --
   Return of capital                                   --           --         --         --         --         --
Total distributions to shareholders                    (1.06)      (1.72)      (1.44)     (1.10)     (0.94)     (0.23)
Net increase (decrease)                                (0.71)      (0.34)      (0.35)     (0.05)      1.18      (0.29)
Net asset value, end of period                        $19.26      $19.97      $20.31     $20.66    $ 20.71     $19.53
Total return (a)                                        1.70%       7.08%       5.54%      5.22%     11.09%     (0.30)%
Ratio to average net assets of (b):
   Expenses, before waivers and
     reimbursements                                     1.16%       1.15%       1.20%      1.27%      1.30%      1.34%
   Expenses, net of waivers and reimbursements          0.75%       0.75%       0.75%      0.75%      0.75%      0.75%
   Net investment income, before
     waivers and reimbursements                         8.57%       8.91%       7.03%      4.44%      4.30%      3.83%
   Net investment income, net of
     waivers and reimbursements                         8.98%       9.31%       7.48%      4.96%      4.85%      4.42%
Portfolio turnover rate                                55.50%      89.97%      48.49%     47.68%     54.68%     48.67%
Net assets at end of period (in thousands)            $246         $824       $891       $343        $13         $1
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(b) Annualized for periods less than a full year.
(c) Financial  highlights for the six months ended May 31, 1999 were  calculated
using average shares  outstanding for the period.  (b) For the period  September
14, 1994 (Class D Shares issue date) through November 30, 1994.



<PAGE>



Financial Highlights [TO BE UPDATED]
Intermediate Bond Portfolio
For the Years Ended November 30,

<TABLE>
<CAPTION>
<S><C>                                        <C>               <C>              <C>          <C>            <C>


                                                                 Class A                               Class D
                                             -----------------------------------------------------------------------------
                                                 For the                                       For the
                                               Six Months       For the         For the      Six Months      For the
                                                  Ended     Year Ended 1998   Year Ended        Ended       Year Ended
                                              May 31, 1999                     1997 (a)     May 31, 1999     1998 (b)

Net asset value, beginning of period             $20.15          $19.89         $20.00          $20.13        $20.46
Income (loss) from investment operations:
   Net investment income                           0.52            1.19           0.38            0.49          0.18
   Net realized and unrealized gain (loss)        (0.62)           0.27          (0.15)          (0.63)        (0.32)
Total income (loss) from investment               (0.10)           1.46           0.23           (0.14)        (0.14)
operations
Distributions to shareholders from:
   Net investment income                          (0.50)          (1.20)         (0.34)          (0.46)        (0.19)
   Net realized gain                              (0.12)          --             --              (0.12)       --
   Return of capital                               --             --             --             --            --
Total distributions to shareholders               (0.62)          (1.20)         (0.34)          (0.58)        (0.19)
Net increase (decrease)                           (0.72)           0.26          (0.11)          (0.72)        (0.33)
Net asset value, end of period                   $19.43          $20.15         $19.89          $19.41        $20.13
Total return (c)                                  (0.59)%          7.55%          1.17%          (0.79)%       (0.70)%
Ratio to average net assets of (d):
   Expenses, before waivers and                    0.78%           1.09%          2.28%           1.17%         1.48%
reimbursements
   Expenses, net of waivers and                    0.36%           0.36%          0.36%           0.75%         0.75%
reimbursements
   Net investment income, before waivers and
     reimbursements                                4.83%           5.46%          3.95%           4.44%         4.96%
   Net investment income, net of waivers and
     reimbursements                                5.25%           6.19%          5.87%           4.86%         5.69%
Portfolio turnover rate                          127.74%          93.40%         56.99%         127.74%        93.40%
Net assets at end of period (in thousands)       $47,080        $30,439        $11,997          $41           $41
</TABLE>

(a) For the period August 1, 1997 (commencement of operations)  through November
30, 1997. (b) For the period October 5, 1998 (Class D Shares issue date) through
November 30, 1998.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(b)   Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
U.S. Treasury Index Portfolio
For the Years Ended November 30,

<TABLE>
<CAPTION>
<S><C>                          <C>         <C>       <C>         <C>       <C>        <C>       <C>         <C>


                                                            Class A                                     Class C
                               ------------------------------------------------------------------------------------------
                                For the                                                           For the
                               Six                                                              Six Months
                               Months      For the    For the    For the    For the    For the     Ended      For the
                               Ended May Year Ended Year Ended Year Ended Year Ended Year Ended   May 31,   Year Ended
                                31, 1999    1998       1997       1996       1995       1994       1999      1998 (a)
Net asset value,
beginning of period              $21.77    $20.81     $20.60     $20.78     $18.77     $21.05      $21.81     $22.28
Income (loss) from investment
   operations:
   Net investment income           0.54      1.23       1.26       1.19       1.11       1.15        0.45       0.21
   Net realized and unrealized
   gain (loss)                    (1.04)     0.97       0.20      (0.18)      2.01      (1.93)      (1.02)     (0.52)
Total income (loss) from
    investment operations         (0.50)     2.20       1.46       1.01       3.12      (0.78)      (0.57)     (0.31)
Distributions to shareholders
   from:
   Net investment income          (0.55)    (1.24)     (1.25)     (1.19)     (1.11)     (1.14)      (0.52)     (0.16)
   Net realized gain              --         --         --         --         --        (0.36)      --          --
   Return of capital              --         --         --         --         --         --         --          --
Total distributions to            (0.55)    (1.24)     (1.25)     (1.19)     (1.11)     (1.50)      (0.52)     (0.16)
shareholders
Net increase (decrease)           (1.05)     0.96       0.21      (0.18)      2.01      (2.28)      (1.09)     (0.47)
Net asset value, end of period   $20.72    $21.77     $20.81     $20.60     $20.78     $18.77      $20.72     $21.81
Total return (b)                  (2.39)%   10.92%      7.44%      5.10%     16.95%     (3.80)%     (2.66)%    (1.39)%
Ratio to average net assets of
(c):
   Expenses, before waivers and
     reimbursements                0.75%     0.77%      0.82%      1.04%      0.89%      0.79%       0.99%      1.01%
   Expenses, net of waivers and
     reimbursements                0.26%     0.26%      0.26%      0.26%      0.26%      0.26%       0.50%      0.50%
   Net investment income,
before                             4.75%     5.22%      5.80%      5.15%      4.46%      5.07%       4.51%      4.71%
     waivers and reimbursements
   Net investment income, net
of                                 5.24%     5.73%      6.36%      5.93%      5.09%      5.60%       5.00%      5.22%
     waivers and reimbursements
Portfolio turnover rate           59.39%    69.84%     72.61%     42.49%     80.36%     52.80%      59.39%     69.84%
Net assets at end of period
   (in thousands)               $22,246    $22,085    $33,839    $26,273    $17,674    $37,305     $140         $17
</TABLE>

(a) For the period October 7, 1998 (Class C Shares issue date) through  November
30, 1998.
(b)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the investment at net asset value at the end of the period. Total return
     is not annualized for periods less than one year.
(c)  Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
U.S. Treasury Index Portfolio
For the Years Ended November 30,


                                                                Class D

<TABLE>
<CAPTION>
<S><C>                          <C>          <C>        <C>       <C>          <C>          <C>

                               --------------------------------------------------------------------------
                                For the
                               Six
                               Months      For the     For the     For the     For the       For the
                               Ended May  Year Ended  Year Ended  Year Ended  Year Ended   Year Ended
                                31, 1999     1998        1997        1996        1995       1994 (a)
Net asset value,
beginning of period              $21.74     $20.77      $20.57      $20.75      $18.77       $18.80
Income (loss) from investment
   operations:
   Net investment income           0.61       1.13        1.20        1.17        1.00         0.09
   Net realized and unrealized    (1.16)
     gain (loss)                              1.00        0.18       (0.24)       2.03        (0.03)
Total income from                 (0.55)
   investment operations                      2.13        1.38        0.93        3.03         0.06
Distributions to shareholders
   from:
   Net investment income          (0.50)     (1.16)      (1.18)      (1.11)      (1.05)       (0.09)
   Net realized gain              --         --          --          --          --            --
   Return of capital              --         --          --          --          --            --
Total distributions to            (0.50)     (1.16)      (1.18)      (1.11)      (1.05)       (0.09)
shareholders
Net increase (decrease)           (1.05)      0.97        0.20       (0.18)       1.98        (0.03)
Net asset value, end of period   $20.69     $21.74      $20.77      $20.57      $20.75       $18.77
Total return (b)                  (2.58%)    10.50%       7.03%       4.72%      16.43%        0.37%
Ratio to average net assets of
(c):
   Expenses, before waivers and    1.14%
     reimbursements                           1.16%       1.21%       1.43%       1.28%        1.18%
   Expenses, net of waivers and    0.65%
     reimbursements                           0.65%       0.65%       0.65%       0.65%        0.65%
   Net investment income,          4.36%
before                                        4.84%       5.51%       4.79%       4.78%        5.52%
     waivers and reimbursements
   Net investment income, net      4.85%
of                                            5.35%       6.07%       5.57%       5.41%        6.05%
     waivers and reimbursements
Portfolio turnover rate           59.39%     69.84%      72.61%      42.49%      80.36%       52.80%
Net assets at end of period       $508
   (in thousands)                           $1,721      $1,707       $848        $286          --
</TABLE>

(a) For the  period  November  16,  1994  (Class D Shares  issue  date)  through
November 30, 1994.
(b)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the investment at net asset value at the end of the period. Total return
     is not annualized for periods less than one year.
(c)  Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
Bond Portfolio
For the Years Ended November 30,

<TABLE>
<CAPTION><S>                                                                         <C>

                                                                                  Class A
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                               <C>             <C>       <C>       <C>         <C>       <C>

                                                   -----------------------------------------------------------------------
                                                      For the
                                                     Six Months    For the    For the    For the    For the    For the
                                                       Ended     Year Ended Year Ended Year Ended Year Ended  Year Ended
                                                    May 31, 1999    1998       1997       1996       1995       1994

Net asset value, beginning of period                   $21.61      $21.08     $20.77     $20.96     $18.29      $20.70
Income (loss) from investment operations:
   Net investment income                                 0.67        1.47       1.34       1.29       1.17        1.42
   Net realized and unrealized gain (loss)              (0.94)       0.62       0.29      (0.19)      2.66       (2.21)
Total income (loss) from investment operations          (0.27)       2.09       1.63       1.10       3.83       (0.79)
Distributions to shareholders from:
   Net investment income                                (0.66)      (1.44)     (1.32)     (1.26)     (1.14)      (1.46)
   Net realized gain                                    (0.68)      (0.12)      --         --         --         (0.15)
   Return of capital                                    --           --         --        (0.03)     (0.02)      (0.01)
Total distributions to shareholders                     (1.34)      (1.56)     (1.32)     (1.29)     (1.16)      (1.62)
Net increase (decrease)                                 (1.61)       0.53       0.31      (0.19)      2.67       (2.41)
Net asset value, end of period                         $20.00      $21.61     $21.08     $20.77     $20.96      $18.29
Total return (a)                                        (1.34)%     10.31%      8.17%      5.57%     21.55%      (4.04)%
Ratio to average net assets of (b):
   Expenses, before waivers and reimbursements           0.76%       0.75%      0.77%      0.84%      0.84%       0.87%
   Expenses, net of waivers and reimbursements           0.36%       0.36%      0.36%      0.36%      0.36%       0.36%
   Net investment income, before waivers and             6.30%
     reimbursements                                                  6.68%      6.25%      5.91%      5.46%       6.80%
   Net investment income, net of waivers and             6.70%
     reimbursements                                                  7.07%      6.66%      6.39%      5.94%       7.31%
Portfolio turnover rate                                 40.98%      84.80%     76.30%    101.38%     74.19%     103.09%
Net assets at end of period (in thousands)            $715,176    $605,517   $460,514   $366,850   $286,301    $257,391
</TABLE>

          (a)  Assumes  investment  at net asset value at the  beginning  of the
     period,  reinvestment  of all dividends and  distributions,  and a complete
     redemption  of the  investment  at the net  asset  value  at the end of the
     period. (b) Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
Bond Portfolio
For the Years Ended November 30,
                                                                     Class C

<TABLE>
<CAPTION>
<S><C>                                    <C>           <C>          <C>        <C>           <C>

                                         ----------------------------------------------------------------
                                            For the
                                          Six Months    For the    For the     For the       For the
                                             Ended    Year Ended Year Ended  Year Ended    Year Ended
                                         May 31, 1999    1998       1997        1996        1995 (a)

Net asset value, beginning of period        $21.60      $21.07     $20.78       $20.96       $20.21
Income (loss) from investment operations:
   Net investment income                      0.67        1.42       1.29         1.25         0.47
   Net realized and unrealized gain          (0.95)       0.62       0.28        (0.18)        0.74
(loss)
Total income (loss) from investment          (0.28)
     Operations                                           2.04       1.57         1.07         1.21
Distributions to shareholders from:
   Net investment income                     (0.64)      (1.39)     (1.28)       (1.22)       (0.45)
   Net realized gain                         (0.68)      (0.12)      --          --            --
   Return of capital                          --          --         --          (0.03)       (0.01)
Total distributions to shareholders          (1.32)      (1.51)     (1.28)       (1.25)       (0.46)
Net increase (decrease)                      (1.60)       0.53       0.29        (0.18)        0.75
Net asset value, end of period              $20.00      $21.60     $21.07       $20.78       $20.96
Total return (b)                             (1.46)%     10.04%      7.88%        5.33%        6.08%
Ratio to average net assets of (c):
   Expenses, before waivers and               1.00%
      Reimbursements                                      0.99%      1.01%        1.08%        1.08%
   Expenses, net of waivers and               0.60%
     Reimbursements                                       0.60%      0.60%        0.60%        0.60%
   Net investment income, before waivers      6.06%
     And reimbursements                                   6.44%      5.98%        5.61%        5.11%
   Net investment income, net of waivers      6.46%
     And reimbursements                                   6.83%      6.39%        6.09%        5.59%
Portfolio turnover rate                      40.98%      84.80%     76.30%      101.38%       74.19%
Net assets at end of period (in             $60,696     $61,450    $50,554     $7,342        $3,704
thousands)
</TABLE>
                                                       Class D

<TABLE>
<CAPTION>
<S><C>                                 <C>             <C>        <C>        <C>       <C>        <C>


                                        --------------------------------------------------------------------
                                          For the
                                         Six Months   For the    For the    For the    For the    For the
                                           Ended    Year Ended Year Ended Year Ended Year Ended Year Ended
                                        May 31, 1999   1998       1997       1996       1995      1994(d)

Net asset value, beginning of period      $21.58      $21.05     $20.76     $20.94      $18.29     $18.74
Income (loss) from investment
operations:
   Net investment income                    0.66        1.38       1.24       1.22        1.08       0.28
   Net realized and unrealized gain        (0.97)       0.63       0.30      (0.18)       2.66      (0.45)
(loss)
Total income (loss) from investment        (0.31)                                                   (0.17)
     Operations                                         2.01       1.54       1.04        3.74
Distributions to shareholders from:
   Net investment income                   (0.62)      (1.36)     (1.25)     (1.19)      (1.09)     (0.28)
   Net realized gain                       (0.68)      (0.12)     --         --          --         --
   Return of capital                        --          --        --         (0.03)      --         --
Total distributions to shareholders        (1.30)      (1.48)     (1.25)     (1.22)      (1.09)     (0.28)
Net increase (decrease)                    (1.61)       0.53       0.29      (0.18)       2.65      (0.45)
Net asset value, end of period            $19.97      $21.58     $21.05     $20.76      $20.94     $18.29
Total return (b)                           (1.53)%      9.89%      7.74%      5.17%      21.06%     (0.94)%
Ratio to average net assets of (c):
   Expenses, before waivers and             1.15%                                                    1.26%
      Reimbursements                                    1.14%      1.16%      1.23%       1.23%
   Expenses, net of waivers and             0.75%                                                    0.75%
     Reimbursements                                     0.75%      0.75%      0.75%       0.75%
   Net investment income, before waivers    5.91%                                                    5.80%
     And reimbursements                                 6.31%      5.86%      5.51%       5.00%
   Net investment income, net of waivers    6.31%                                                    6.31%
     And reimbursements                                 6.70%      6.27%      5.99%       5.48%
Portfolio turnover rate                    40.98%     84.80%     76.30%     101.38%    74.19%     103.09%
Net assets at end of period (in            $1,625     $2,039      $601       $220       $120        $15
thousands)
</TABLE>

(a) For the period July 3, 1995 (Class C Shares issue date) through November 30,
1995.
(b) Assumes  investment at net asset value at the beginning of the period,
reinvestment of all dividends and  distributions,  and a complete  redemption of
the investment at the net asset value at the end of the period.  Total return is
not  annualized  for periods less than one year.
(c) Annualized for periods less
than a full year.  (b) For the period  September  14, 1994 (Class D Shares issue
date) through November 30, 1994.



<PAGE>



Financial Highlights [TO BE UPDATED]
International Bond Portfolio
For the Years Ended November 30,
                                                                        Class C

<TABLE>
<CAPTION>
<S><C>                                      <C>          <C>         <C>           <C>          <C>       <C>

                                          ---------------------------------------------------------------------------
                                             For the
                                           Six Months    For the      For the      For the    For the     For the
                                              Ended     Year Ended   Year Ended  Year Ended  Year Ended  Year Ended
                                          May 31, 1999     1998         1997        1996        1995      1994(a)

Net asset value, beginning of period         $21.35       $20.13       $22.16       $21.74     $19.93      $20.00
Income (loss) from investment operations:
   Net investment income                       1.02         0.98         1.02         1.54       1.26        0.79
   Net realized and unrealized gain (loss)    (1.88)        1.33        (1.70)        0.43       2.28        0.01
Total income (loss) from investment           (0.86)
     Operations                                             2.31        (0.68)        1.97       3.54        0.80
Distributions to shareholders from:
   Net investment income (b)                  (0.73)       (0.79)       (1.01)       (1.55)     (1.73)      (0.87)
   Net realized gain                          (0.14)       (0.30)       (0.34)       --         --          --
     Return of capital                         --          --           --           --         --          --
Total distributions to shareholders           (0.87)       (1.09)       (1.35)       (1.55)     (1.73)      (0.87)
Net increase (decrease)                       (1.73)        1.22        (2.03)        0.42       1.81       (0.07)
Net asset value, end of period               $19.62       $21.35       $20.13       $22.16     $21.74      $19.93
Total return (c)                              (4.53)%      11.85%       (3.02)%       9.47%     18.20%       4.03%
Ratio to average net assets of (d):
   Expenses, before waivers and                1.46%
     Reimbursements                                         1.52%        1.52%        1.58%      1.47%       1.49%
   Expenses, net of waivers and                0.96%
     Reimbursements                                         0.96%        0.96%        0.96%      0.96%       0.96%
   Net investment income, before waivers       4.50%
     And reimbursements                                     4.71%        5.05%        5.29%      5.41%       5.40%
   Net investment income, net of waivers       5.00%
     And reimbursements                                     5.27%        5.61%        5.91%      5.92%       5.93%
Portfolio turnover rate                        6.67%       23.76%       29.29%       33.89%     54.46%      88.65%
Net assets at end of period (in thousands)   $27,720     $28,568      $26,383      $34,183    $32,673     $26,947
</TABLE>

                                                                         Class D
<TABLE>
<CAPTION>
<S><C>                                          <C>           <C>            <C>           <C>            <C>

                                          --------------------------------------------------------------------------
                                               For the
                                             Six Months       For the       For the       For the       For the
                                                Ended        Year Ended    Year Ended    Year Ended    Year Ended
                                           May 31, 1999(e)      1998          1997          1996        1995(f)

Net asset value, beginning of period          $21.26           $20.06        $22.14        $21.74        $22.17
Income (loss) from investment operations:
   Net investment income                        0.38             0.93          0.97          1.37          0.02
   Net realized and unrealized gain (loss)     (1.40)            1.29         (1.72)         0.51         (0.08)
Total income (loss) from investment            (1.02)
     Operations                                                  2.22         (0.75)         1.88         (0.06)
Distributions to shareholders from:
   Net investment income (b)                   (0.54)           (0.72)        (0.99)        (1.48)        (0.37)
   Net realized gain                           (0.14)           (0.30)        (0.34)        --            --
     Return of capital                           --             --            --            --            --
Total distributions to shareholders            (0.68)           (1.02)        (1.33)        (1.48)        (0.37)
Net increase (decrease)                        (1.70)            1.20         (2.08)         0.40         (0.43)
Net asset value, end of period                $19.56           $21.26        $20.06        $22.14        $21.74
Total return (c)                               (5.00)%          11.43%        (3.38)%        9.04%        (0.30)%
Ratio to average net assets of (d):
   Expenses, before waivers and                 1.85%
     Reimbursements                                              1.91%         1.91%         1.97%         1.86%
   Expenses, net of waivers and                 1.35%
     Reimbursements                                              1.35%         1.35%         1.35%         1.35%
   Net investment income, before waivers        4.11%
     And reimbursements                                          4.34%         4.80%         5.05%         2.75%
   Net investment income, net of waivers        4.61%
     And reimbursements                                          4.90%         5.36%         5.67%         3.26%
Portfolio turnover rate                         6.67%           23.76%        29.29%        33.89%        54.46%
Net assets at end of period (in thousands)       $1             $132          $91           $52            $9
</TABLE>

(a) For the period March 28, 1994 (commencement of operations)  through November
30, 1994.
(b)  Distributions  to shareholders  from net investment  income include amounts
relating to foreign currency  transactions  which are treated as ordinary income
for Federal income tax  purposes.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(d) Annualized for periods less than a full year.
(e) Financial  Highlights for the six months ended May 31, 1999 were  calculated
using average shares outstanding for the period. (f) For the period November 20,
1995 (Class D Shares issue date) through November 30, 1995.



<PAGE>



Financial Highlights [TO BE UPDATED]
Balanced Portfolio
For the Years Ended November 30,
<TABLE>
<CAPTION><S>                                                                       <C>
                                                                                Class A
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                           <C>              <C>          <C>        <C>         <C>        <C>

                                               ---------------------------------------------------------------------------
                                                   For the
                                                  Six Months      For the     For the    For the     For the    For the
                                                    Ended       Year Ended  Year Ended  Year Ended Year Ended Year Ended
                                                 May 31, 1999      1998        1997        1996       1995       1994

Net asset value, beginning of period                $14.95        $13.59       $12.24     $11.05      $9.50      $10.22
Income (loss) from investment operations:
   Net investment income                              0.19          0.38         0.38       0.34       0.34        0.24
   Net realized and unrealized gain (loss)            0.03          1.81         1.66       1.19       1.55       (0.72)
Total income (loss) from investment operations        0.22          2.19         2.04       1.53       1.89       (0.48)
Distributions to shareholders from:
   Net investment income                             (0.28)        (0.32)       (0.38)     (0.34)     (0.34)      (0.22)
   Net realized gain                                 (0.51)        (0.51)       (0.31)     --          --         (0.02)
   Return of capital                                 --             --          --         --          --         --
Total distributions to shareholders                  (0.79)        (0.83)       (0.69)     (0.34)     (0.34)      (0.24)
Net increase (decrease)                              (0.57)         1.36         1.35       1.19       1.55       (0.72)
Net asset value, end of period                      $14.38        $14.95       $13.59     $12.24     $11.05       $9.50
Total return (a)                                      7.06%        16.90%       17.29%     14.07%     20.22%      (4.76)%
Ratio to average net assets of (b):
   Expenses, before waivers and reimbursements        1.00%         1.04%        1.11%      1.20%      1.28%       1.50%
   Expenses, net of waivers and reimbursements        0.61%         0.61%        0.61%      0.61%      0.61%       0.61%
   Net investment income, before waivers and          2.22%
     reimbursements                                                 2.40%        2.49%      2.44%      2.69%       1.68%
   Net investment income, net of waivers and          2.61%
     reimbursements                                                 2.83%        2.99%      3.03%      3.36%       2.56%
Portfolio turnover rate                              41.89%        67.16%       59.06%    104.76%     93.39%      75.69%
Net assets at end of period (in thousands)         $73,013        $61,969     $51,475    $ 45,157    $38,897    $31,462
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
reinvestment of all dividends and  distributions,  and a complete  redemption of
the  investment at the net asset value at the end of the period.  (b) Annualized
for periods less than a full year.


<PAGE>



Financial Highlights [TO BE UPDATED]
Balanced Portfolio
For the Years Ended November 30,

<TABLE>
<CAPTION>
<S>                                                         <C>                                          <C>


                                                           Class C                                      Class D

</TABLE>

<TABLE>
<CAPTION>
<S><C>                                  <C>            <C>        <C>       <C>         <C>        <C>         <C>      <C>

                                        -------------------------------------------------------------------------------------------
                                          For the
                                         Six Months
                                           Ended      For the    For the    For the    For the    For the    For the    For the
                                          May 31,   Year Ended Year Ended Year Ended Year Ended Year Ended Year Ended  Year Ended
                                          1999(a)      1998       1997     1996 (b)     1999       1998       1997      1996 (c)

Net asset value, beginning of period      $14.91      $13.56     $12.24      $11.12     $14.88     $13.54     $12.23     $11.34
Income from investment operations:
   Net investment income                    0.20        0.37       0.36        0.29       0.15       0.40       0.34       0.22
   Net realized and unrealized gain         0.03        1.78       1.64        1.12       0.09       1.72       1.64       0.96
Total income from investment operations     0.23        2.15       2.00        1.41       0.24       2.12       1.98       1.18
Distributions to shareholders from:
   Net investment income                   (0.23)      (0.29)     (0.37)      (0.29)     (0.28)     (0.27)     (0.36)     (0.29)
   Net realized gain                       (0.51)      (0.51)     (0.31)      --         (0.51)     (0.51)     (0.31)     --
   Return of capital                        --          --         --         --         --         --         --         --
Total distributions to shareholders        (0.74)      (0.80)     (0.68)      (0.29)     (0.79)     (0.78)     (0.67)     (0.29)
Net increase                               (0.51)       1.35       1.32        1.12      (0.55)      1.34       1.31       0.89
Net asset value, end of period            $14.40      $14.91     $13.56      $12.24     $14.33     $14.88     $13.54     $12.23
Total return (d)                            7.12%      16.61%     17.00%      12.72%      6.92%     16.45%     16.82%     10.55%
Ratio to average net assets of (e):
   Expenses, before waivers and             1.24%       1.28%      1.35%       1.44%      1.39%      1.43%      1.50%      1.59%
reimbursements
   Expenses, net of waivers and             0.85%       0.85%      0.85%       0.85%      1.00%      1.00%      1.00%      1.00%
reimbursements
   Net investment income, before            1.98%       2.15%      2.25%       2.21%      1.83%      2.01%      2.10%      2.19%
waivers           and reimbursements
   Net investment income, net of            2.37%       2.58%      2.75%       2.80%      2.22%      2.44%      2.60%      2.78%
waivers and
     Reimbursements
Portfolio turnover rate                    41.89%      67.16%     59.06%     104.76%     41.89%     67.16%     59.06%    104.76%
Net assets at end of period (in             $816      $5,459     $4,587     $5,997      $522       $752       $322        $232
thousands)
</TABLE>

(a) Financial  Highlights for the six months ended May 31, 1999 were  calculated
using average shares outstanding for the period. (b) For the period December 29,
1995 (Class C Shares issue date) through  November 30, 1996.  (c) For the period
February 20, 1996 (Class D Shares issue date) through November 30, 1996.
(d)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(d)  Annualized for periods less than a full year.


<PAGE>



Financial Highlights [TO BE UPDATED]
Equity Index Portfolio
For the Years Ended November 30,

                                                                        Class A
<TABLE>
<CAPTION>
<S><C>                                             <C>           <C>        <C>        <C>        <C>

                                                 ------------------------------------------------------------------------
                                                     For the
                                                    Six Months     For the    For the    For the    For the    For the
                                                      Ended      Year Ended Year Ended Year Ended Year Ended Year Ended
                                                   May 31, 1999     1998       1997       1996       1995       1994

Net asset value, beginning of period                 $22.69         $20.09     $16.79     $13.86     $10.60     $10.78
Income (loss) from investment operations:
   Net investment income                               0.14           0.28       0.30       0.31       0.30       0.27
   Net realized and unrealized gain (loss)             2.56           4.02       4.13       3.36       3.47      (0.18)
Total income from investment operations                2.70           4.30       4.43       3.67       3.77       0.09
Distributions to shareholders from:
   Net investment income                              (0.19)         (0.26)     (0.30)     (0.31)     (0.30)     (0.27)
   Net realized gain                                  (1.43)         (1.44)     (0.83)     (0.43)     (0.21)     --
   Return of capital                                   --            --         --         --         --         --
Total distributions to shareholders                   (1.62)         (1.70)     (1.13)     (0.74)     (0.51)     (0.27)
Net increase (decrease)                                1.08           2.60       3.30       2.93       3.26      (0.18)
Net asset value, end of period                       $23.77         $22.69     $20.09     $16.79     $13.86     $10.60
Total return (a)                                      12.45%         23.39%     27.93%     27.53%     36.60%      0.87%
Ratio to average net assets of:
   Expenses, before waivers and reimbursements         0.44%          0.46%      0.46%      0.50%      0.54%      0.59%
   Expenses, net of waivers and reimbursements         0.21%          0.21%      0.22%      0.22%      0.22%      0.23%
   Net investment income, before waivers and
     Reimbursements                                    1.01%          1.11%      1.42%      1.84%      2.22%      2.25%
   Net investment income, net of waivers and
     Reimbursements                                    1.24%          1.36%      1.66%      2.12%      2.54%      2.62%
Portfolio turnover rate                                4.77%         15.26%     18.96%     18.02%     15.27%     71.98%
Net assets at end of period (in thousands)          $1,291,723   $1,175,112  $844,065   $675,804   $479,763   $281,817
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the investment at the net asset value at the end of the period.



<PAGE>



Financial Highlights [TO BE UPDATED]
Equity Index Portfolio
For the Years Ended November 30,

                                                                    Class C
<TABLE>
<CAPTION>
<S><C>                                  <C>           <C>          <C>          <C>          <C>

                                        -----------------------------------------------------------------
                                           For the
                                         Six Months     For the     For the      For the      For the
                                            Ended     Year Ended   Year Ended   Year Ended   Year Ended
                                        May 31, 1999     1998         1997         1996       1995 (a)

Net asset value, beginning of period       $22.64       $20.05       $16.79      $13.86        $13.43
Income (loss) from investment
operations:
   Net investment income                     0.12         0.24         0.26        0.28          0.05
   Net realized and unrealized gain          2.54         4.01         4.11        3.35          0.45
(loss)
Total income (loss) from investment
     Operations                              2.66         4.25         4.37        3.63          0.50
Distributions to shareholders from:
   Net investment income                    (0.16)       (0.22)       (0.28)      (0.27)        (0.07)
   Net realized gain                        (1.43)       (1.44)       (0.83)      (0.43)        --
   Return of capital                         --           --          --           --           --
Total distributions to shareholders         (1.59)       (1.66)       (1.11)      (0.70)        (0.07)
Net increase (decrease)                      1.07         2.59         3.26        2.93          0.43
Net asset value, end of period             $23.71       $22.64       $20.05      $16.79        $13.86
Total return (c)                            12.28%       23.09%       27.64%      27.24%         3.94%
Ratio to average net assets of (d):
   Expenses, before waivers and
     Reimbursements                          0.68%        0.70%        0.70%       0.74%         0.78%
   Expenses, net of waivers and
     Reimbursements                          0.45%        0.45%        0.46%       0.46%         0.46%
   Net investment income, before waivers
     and reimbursements                      0.77%        0.87%        1.18%       1.61%         1.97%
   Net investment income, net of waivers
     and reimbursements                      1.00%        1.12%        1.42%       1.89%         2.29%
Portfolio turnover rate                      4.77%       15.26%       18.96%      18.02%        15.27%
Net assets at end of period (in           $113,100     $111,991     $82,982      $53,929      $18,390
thousands)
</TABLE>

                                                                      Class D
<TABLE>
<CAPTION>
<S><C>                                <C>         <C>         <C>       <C>          <C>        <C>

                                       ----------------------------------------------------------------------
                                         For the
                                       Six Months
                                          Ended     For the    For the    For the     For the     For the
                                         May 31,  Year Ended Year Ended  Year Ended  Year Ended  Year Ended
                                          1999       1998       1997        1996        1995      1994 (b)

Net asset value, beginning of period     $22.58     $20.00      $16.77     $13.83      $10.60      $10.96
Income (loss) from investment
operations:
  Net investment income                    0.08       0.21        0.26       0.27        0.25        0.02
  Net realized and unrealized gain         2.55       4.00        4.07       3.36        3.47       (0.31)
(loss)
Total income (loss) from investment
     Operations                            2.63       4.21        4.33       3.63        3.72       (0.29)
Distributions to shareholders from:
  Net investment income                   (0.12)     (0.19)      (0.27)     (0.26)      (0.28)      (0.07)
  Net realized gain                       (1.43)     (1.44)      (0.83)     (0.43)      (0.21)      --
  Return of capital                        --         --         --         --          --          --
Total distributions to shareholders       (1.55)     (1.63)      (1.10)     (0.69)      (0.49)      (0.07)
Net increase (decrease)                    1.08       2.58        3.23       2.94        3.23       (0.36)
Net asset value, end of period           $23.66     $22.58      $20.00     $16.77      $13.83      $10.60
Total return (c)                          12.18%     22.90%      27.45%     27.20%      36.20%      (2.68)%
Ratio to average net assets of (d):
  Expenses, before waivers and
     Reimbursements                        0.83%      0.85%       0.85%      0.89%       0.93%       0.96%
  Expenses, net of waivers and
     Reimbursements                        0.60%      0.60%       0.61%      0.61%       0.61%       0.60%
  Net investment income, before waivers
     and reimbursements                    0.62%      0.71%       1.03%      1.50%       1.75%       2.31%
  Net investment income, net of waivers
     and reimbursements                    0.85%      0.97%       1.27%      1.78%       2.07%       2.67%
Portfolio turnover rate                    4.77%     15.26%      18.96%     18.02%      15.27%      71.98%
Net assets at end of period (in          $16,645    $31,703    $30,650     $8,005       $810         $3
thousands)
</TABLE>

(a) For the period  September  28,  1995  (Class C Shares  issue  date)  through
November 30, 1995.
(b) For the period  September 14, 1994 (Class D Shares issue
date) through November 30, 1994.
(c) Assumes investment at net asset value at the
beginning of the period, reinvestment of all dividends and distributions,  and a
complete  redemption of the  investment at the net asset value at the end of the
period.  Total  return is not  annualized  for periods  less than one year.
(d) Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
Diversified Growth Portfolio
For the Years Ended November 30,
<TABLE>
<CAPTION>
<S>                                                                               <C>

                                                                                  Class A
</TABLE>

<TABLE>
<CAPTION>
<S><C>                                             <C>           <C>        <C>        <C>        <C>        <C>

                                                   -----------------------------------------------------------------------
                                                      For the
                                                     Six Months    For the    For the    For the    For the    For the
                                                       Ended     Year Ended Year Ended Year Ended Year Ended  Year Ended
                                                    May 31, 1999    1998       1997       1996       1995        1994

Net asset value, beginning of period                   $17.76      $16.20     $14.36      $12.20      $9.88     $10.65
Income (loss) from investment operations:
   Net investment income                                 0.04        0.07       0.11        0.14       0.15       0.09
   Net realized and unrealized gain (loss)               1.94        3.46       3.33        2.33       2.26      (0.83)
Total income (loss) from investment operations           1.98        3.53       3.44        2.47       2.41      (0.74)
Distributions to shareholders from:
   Net investment income                                (0.07)      (0.11)     (0.14)      (0.15)     (0.09)     (0.01)
   Net realized gain                                    (1.92)      (1.86)     (1.46)      (0.16)     --         (0.02)
   Return of capital                                    --           --         --         --         --         --
Total distributions to shareholders                     (1.99)      (1.97)     (1.60)      (0.31)     (0.09)     (0.03)
Net increase (decrease)                                 (0.01)       1.56       1.84        2.16       2.32      (0.77)
Net asset value, end of period                         $17.75      $17.76     $16.20      $14.36     $12.20      $9.88
Total return (a)                                        11.81%      25.22%     27.06%      20.83%     24.55%     (6.98)%
Ratio to average net assets of:
   Expenses, before waivers and reimbursements           0.95%       0.96%      1.03%       1.10%      1.12%      1.08%
   Expenses, net of waivers and reimbursements           0.66%       0.66%      0.67%       0.66%      0.69%      0.67%
   Net investment income, before waivers and
     Reimbursements                                      0.13%       0.15%      0.40%       0.54%      0.73%      0.35%
   Net investment income, net of waivers and
     Reimbursements                                      0.42%       0.45%      0.76%       0.98%      1.16%      0.77%
Portfolio turnover rate                                 30.62%      37.74%     45.53%      59.99%     81.65%     78.94%
Net assets at end of period (in thousands)            $188,512    $177,947   $158,383   $142,055   $146,731    $164,963
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the investment at the net asset value at the end of the period.



<PAGE>



Financial Highlights [TO BE UPDATED]
Diversified Growth Portfolio
For the Years Ended November 30,

                                                                        Class D
<TABLE>
<CAPTION>
<S><C>                                              <C>         <C>         <C>        <C>        <C>       <C>

                                                    -----------------------------------------------------------------------
                                                     For the
                                                    Six Months
                                                      Ended       For the     For the    For the    For the    For the
                                                     May 31,     Year Ended Year Ended Year Ended Year Ended Year Ended
                                                     1999(a)        1998       1997       1996       1995     1994 (b)

Net asset value, beginning of period                  $17.53      $16.03      $14.26      $12.16      $9.88     $10.41
Income (loss) from investment operations:
   Net investment income                                0.02        0.03        0.09        0.11       0.11       0.01
   Net realized and unrealized gain (loss)              1.89        3.40        3.27        2.29       2.25      (0.54)
Total income (loss) from investment operations          1.91        3.43        3.36        2.40       2.36      (0.53)
Distributions to shareholders from:
   Net investment income                               (0.01)      (0.07)      (0.13)      (0.14)     (0.08)     --
   Net realized gain                                   (1.92)      (1.86)      (1.46)      (0.16)     --         --
   Return of capital                                   --           --          --         --         --         --
Total distributions to shareholders                    (1.93)      (1.93)      (1.59)      (0.30)     (0.08)     --
Net increase (decrease)                                (0.02)       1.50        1.77        2.10       2.28      (0.53)
Net asset value, end of period                        $17.51      $17.53      $16.03      $14.26     $12.16      $9.88
Total return (c)                                       11.48%      24.73%      26.60%      20.39%     24.19%     (5.14)%
Ratio to average net assets of (d):
   Expenses, before waivers and reimbursements          1.34%       1.35%       1.42%       1.49%      1.51%      1.46%
   Expenses, net of waivers and reimbursements          1.05%       1.05%       1.06%       1.05%      1.08%      1.05%
   Net investment income, before waivers and
     reimbursements                                    (0.26)%     (0.24)%      0.01%       0.15%      0.30%      0.53%
   Net investment income, net of waivers and
     reimbursements                                     0.03%       0.06%       0.37%       0.59%      0.73%      0.94%
Portfolio turnover rate                                30.62%      37.74%      45.53%      59.99%     81.65%     78.94%
Net assets at end of period  (in thousands)            $327        $1,122      $696        $433      $221        $40
</TABLE>

(a) Financial  highlights for the six months ended May 31, 1999 were  calculated
using average shares  outstanding for the period.  (b) For the period  September
14, 1994 (Class D Shares issue date) through November 30, 1994.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(d)  Annualized for periods less than a full year.


<PAGE>



Financial Highlights [TO BE UPDATED]
Focused Growth Portfolio
For the Years Ended November 30,

                                                                         Class A
<TABLE>
<CAPTION>
<S><C>                                            <C>             <C>         <C>        <C>        <C>        <C>

                                                   ------------------------------------------------------------------------
                                                      For the
                                                     Six Months    For the     For the     For the    For the    For the
                                                       Ended      Year Ended  Year Ended Year Ended Year Ended Year Ended
                                                    May 31, 1999     1998        1997       1996       1995       1994

Net asset value, beginning of period                   $16.39       $16.20      $14.48      $12.53     $9.79     $10.43
Income (loss) from investment operations:
   Net investment income                                (0.01)       (0.01)       0.05        0.02      0.05       0.02
   Net realized and unrealized gain (loss)               2.80         3.10        3.37        2.17      2.71      (0.66)
Total income (loss) from investment operations           2.79         3.09        3.42        2.19      2.76      (0.64)
Distributions to shareholders from:
   Net investment income                                --           (0.05)      (0.02)      (0.05)    (0.02)      --
   Net realized gain                                    (1.26)       (2.85)      (1.68)      (0.19)     --         --
   Return of capital                                    --           --          --          --         --         --
Total distributions to shareholders                     (1.26)       (2.90)      (1.70)      (0.24)    (0.02)      --
Net increase (decrease)                                  1.53         0.19        1.72        1.95      2.74      (0.64)
Net asset value, end of period                         $17.92       $16.39      $16.20      $14.48    $12.53      $9.79
Total return (a)                                        17.86%       24.03%      27.05%      17.82%    28.38%     (6.15)%
Ratio to average net assets of:
   Expenses, before waivers and reimbursements           1.26%        1.29%       1.34%       1.43%     1.47%      1.55%
   Expenses, net of waivers and reimbursements           0.91%        0.92%       0.92%       0.91%     0.91%      0.91%
   Net investment loss, before waivers and
     reimbursements                                     (0.54)%      (0.41)%     (0.12)%     (0.40)%   (0.10)%    (0.39)%
   Net investment income, net of waivers and
     reimbursements                                     (0.19)%      (0.04)%      0.30%       0.12%     0.46%      0.24%
Portfolio turnover rate                                 48.67%       79.11%     108.29%     116.78%    85.93%     74.28%
Net assets at end of period (in thousands)            $153,927     $123,380    $115,802   $106,250    $86,099    $57,801
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the investment at the net asset value at the end of the period.


<PAGE>




Financial Highlights [TO BE UPDATED]
Focused Growth Portfolio
For the Years Ended November 30,
<TABLE>
<CAPTION>
<S>                                                    <C>                                         <C>

                                                       Class C                                      Class D
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                 <C>       <C>       <C>       <C>        <C>       <C>       <C>       <C>

                                       --------------------------------------------------------------------------------------------
                                       For the
                                       Six       For the   For the   For the    For the    For the  For the   For the   For the
                                       Months    Year      Year       Year       Year       Year    Year      Year      Year
                                       Ended May Ended 1998Ended      Ended      Ended      Ended   Ended 1997Ended 1996Ended
                                        31, 1999             1997   1996 (a)     1999       1998                         1995 (b)

Net asset value, beginning of period     $16.34    $16.16  $14.47    $13.46     $16.14     $16.01     $14.37    $12.48     $9.55

Income (loss) from investment operations:
   Net investment income (loss)           (0.03)    (0.05)    0.01    (0.01)     (0.10)     (0.05)      0.03     (0.03)     0.02
   Net realized and unrealized gain        2.79      3.09     3.37     1.02       2.81       3.04       3.30      2.15      2.93
Total income from investment operations    2.76      3.04     3.38     1.01       2.71       2.99       3.33      2.12      2.95
Distributions to shareholders from:
   Net investment income                  --        (0.01) (0.01)      --         --        (0.01)     (0.01)    (0.04)    (0.02)

   Net realized gain                      (1.26)    (2.85) (1.68)      --        (1.26)     (2.85)     (1.68)    (0.19)    --

   Return of capital                     --         --        --         --       --          --         --      --        --
Total distributions to shareholders       (1.26)    (2.86) (1.69)       --        (1.26)     (2.86)     (1.69)    (0.23)    (0.02)

Net increase                               1.50      0.18     1.69     1.01       1.45       0.13       1.64      1.89      2.93
Net asset value, end of period           $17.84    $16.34  $16.16    $14.47     $17.59     $16.14     $16.01    $14.37    $12.48

Total return (c)                          17.78%    23.73%   26.75%    7.51%     17.62%     23.60%     26.52%    17.42%    30.97%
Ratio to average net assets of (d):
   Expenses, before waivers and            1.50%     1.53%    1.58%    1.67%      1.65%      1.68%      1.73%     1.82%     1.86%
reimbursements
   Expenses, net of waivers and            1.15%     1.16%    1.16%    1.15%      1.30%      1.31%      1.31%     1.30%     1.30%
reimbursements
   Net investment loss, before waivers
and                                       (0.78)%   (0.66)%  (0.36)%  (0.64)%    (0.93)%    (0.81)%    (0.51)%   (0.80)%   (0.67)%
     Reimbursements
   Net investment income (loss), net
of                waivers and             (0.43)%   (0.29)%   0.06%   (0.12)%    (0.58)%    (0.44)%    (0.09)%   (0.28)%   (0.11)%
reimbursements
Portfolio turnover rate                   48.67%    79.11%  108.29%  116.78%     48.67%     79.11%    108.29%   116.78%    85.93%
Net assets at end of period (in          $9,948    $8,719   $8,325   $6,993      $812      $1,779     $1,206     $656      $489
thousands)
</TABLE>

(a) For the period June 14, 1996 (Class C Shares  issue date)  through  November
30,  1996.  (b) For the period  December  8, 1994  (Class D Shares  issue  date)
through November 30, 1995.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
 (d) Annualized for periods less than a full year.


<PAGE>



Financial Highlights [TO BE UPDATED]
Small Company Index Portfolio
For Years Ended November 30,

                                                                        Class A
<TABLE>
<CAPTION>
<S><C>                                          <C>              <C>          <C>        <C>         <C>           <C>

                                                --------------------------------------------------------------------------------
                                                    For the
                                                   Six Months      For the      For the    For the     For the       For the
                                                     Ended        Year Ended  Year Ended Year Ended   Year Ended   Year Ended
                                                  May 31, 1999       1998        1997       1996         1995         1994

Net asset value, beginning of period                $13.02          $15.05       $13.97     $12.98       $10.86      $11.29
Income (loss) from investment operations:
   Net investment income                              0.05            0.13         0.15       0.19         0.16        0.14
   Net realized and unrealized gain (loss)            1.15           (1.13)        2.69       1.75         2.67       (0.30)
Total income (loss) from investment operations        1.19           (1.00)        2.84       1.94         2.83       (0.16)
Distributions to shareholders from:
   Net investment income                             (0.10)          (0.14)       (0.17)     (0.14)       (0.15)      (0.02)
   Net realized gain                                 (1.51)          (0.89)       (1.59)     (0.81)       (0.56)      (0.25)
   Return of capital                                  --             --           --         --          --            --
Total distributions to shareholders                  (1.60)          (1.03)       (1.76)     (0.95)       (0.71)      (0.27)
Net increase (decrease)                              (0.41)          (2.03)        1.08       0.99         2.12       (0.43)
Net asset value, end of period                      $12.61          $13.02       $15.05     $13.97       $12.98      $10.86
Total return (a)                                     10.33%          (7.02)%      23.06%     15.96%       27.76%      (1.54)%
Ratio to average net assets of (b):
   Expenses, before waivers and reimbursements        0.80%           0.74%        0.68%      0.79%        0.81%       0.86%
   Expenses, net of waivers and reimbursements        0.36%(c)        0.31%        0.32%      0.32%        0.32%       0.33%
   Net investment income, before waivers and
     Reimbursements                                   0.85%           0.76%        0.86%      0.89%        0.82%       0.74%
   Net investment income, net of waivers and
     Reimbursements                                   1.29%           1.19%        1.22%      1.36%        1.31%       1.27%
Portfolio turnover rate                              46.54%          59.21%       42.66%     46.26%       38.46%       98.43%
Net assets at end of period (in thousands)          $170,920       $139,100    $147,887   $112,856     $94,899       $77,120
</TABLE>

(a)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return  does not reflect the .75%  additional  transaction  fee that was in
     effect prior to April 1, 1998 which would reduce  total  return.  Effective
     April 1, 1998, the additional transaction fee has been reduced to .50%.
(b) Annualized for periods less than a full year.
(c)  Expense ratio, net of waivers and reimbursement,  for the six months ended
May 31, 1999 would have been 0.31% for Class A absent the effect of any interest
expenses incurred by the fund's temporary borrowing against a credit line
agreement.


<PAGE>




Financial Highlights [TO BE UPDATED]
Small Company Index Portfolio
For Years Ended November 30,
<TABLE>
<CAPTION>
<S>                                                               <C>                                    <C>

                                                                  Class C                                Class D
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                         <C>               <C>        <C>        <C>        <C>       <C>         <C>

                                               -------------------------------------------------------------------------------------
                                                    For the
                                                  Six Months      For the     For the    For the    For the    For the    For the
                                                     Ended       Year Ended Year Ended Year Ended Year Ended Year Ended Year Ended
                                                 May 31, 1999     1998(a)      1999       1998       1997       1996     1995 (b)

Net asset value, beginning of period                $12.98         $13.89    $12.94      $15.01     $13.96     $12.95      $10.51
Income from investment operations:
  Net investment income                               0.05           0.03      0.11        0.11       0.17       0.13        0.18
  Net realized and unrealized gain                    1.09          (0.94)     1.08       (1.19)      2.62       1.83        2.96
Total income from investment operations               1.14          (0.91)     1.19       (1.08)      2.79       1.96        3.14
Distributions to shareholders from:
  Net investment income                              (0.03)         --        (0.10)      (0.10)     (0.15)     (0.14)      (0.14)
  Net realized gain                                  (1.51)         --        (1.51)      (0.89)     (1.59)     (0.81)      (0.56)
  Return of capital                                   --            --          --         --         --         --         --
Total distributions to shareholders                  (1.54)         --        (1.61)      (0.99)     (1.74)     (0.95)      (0.70)
Net increase                                         (0.40)         (0.91)    (0.42)      (2.07)      1.05       1.01        2.44
Net asset value, end of period                      $12.58         $12.98    $12.52      $12.94     $15.01     $13.96      $12.95
Total return (c)                                      9.89%         (6.54)%    9.83%      (7.58)%    22.68%     16.20%      31.62%
Ratio to average net assets of (d):
  Expenses, net of waivers and reimbursements         1.04%          0.55%     1.19%       0.70%      0.71%      0.71%       0.71%
  Expenses, before waivers and reimbursements         0.60%(e)       0.98%     0.75%(e)    1.13%      1.07%      1.18%       1.20%
  Net investment income, before waivers and
    Reimbursements                                    0.61%          0.55%     0.46%       0.37%      0.40%      0.55%       0.41%
  Net investment income, net of waivers and
    Reimbursements                                    1.05%          0.98%     0.90%       0.80%      0.76%      1.02%       0.90%
Portfolio turnover rate                              46.54%         59.21%    46.54%      59.21%     42.66%     46.26%      38.46%
Net assets at end of period (in thousands)           $361           $870       $559       $855       $690       $269        $44
</TABLE>

(a) For the period January 8, 1998 (Class C Shares issue date) through  November
30,  1998.  (b) For the period  December  8, 1994  (Class D Shares  issue  date)
through November 30, 1995.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return  is not  annualized  for  periods  less  than  one year and does not
     reflect the .75%  additional  transaction  fee that was in effect  prior to
     April 1, 1998 which would reduce total return. Effective April 1, 1998, the
     additional transaction fee has been reduced to .50%.
(d) Annualized for periods less than a full period.
(e)  Expense ratio, net of waivers and  reimbursement,  for the six months ended
     May 31, 1999 would have been 0.55% and 0.70% for Class C and D respectively
     absent the effect of any interest expenses incurred by the fund's temporary
     borrowing against a credit line agreement.


<PAGE>



Financial Highlights [TO BE UPDATED]
International Growth Portfolio
For the Years Ended November 30,

                                                                        Class A
<TABLE>
<CAPTION>
<S><C>                                            <C>            <C>        <C>       <C>         <C>        <C>

                                                  -----------------------------------------------------------------------
                                                      For the
                                                    Six Months   For the     For the    For the    For the     For the
                                                   Ended May 31, Year      Year Ended Year Ended  Year Ended Year Ended
                                                       1999      Ended 1998   1997       1996        1995     1994 (a)

Net asset value, beginning of period                  $11.78        $10.52    $10.63     $ 9.88     $10.21     $10.00
Income (loss) from investment operations:
   Net investment income                                0.11          0.09      0.11       0.10       0.12       0.05
   Net realized and unrealized gain (loss)              0.93          1.90      0.31       0.87      (0.36)      0.16
Total income (loss) from investment operations          1.04          1.99      0.42       0.97      (0.24)      0.21
Distributions to shareholders from:
   Net investment income                               (0.23)        (0.16)    (0.08)     (0.22)     (0.05)      --
   Net realized gain                                   (0.76)        (0.57)    (0.45)     --         (0.04)      --
   Return of capital                                    --          --         --         --         --          --
Total distributions to shareholders                    (0.99)        (0.73)    (0.53)     (0.22)     (0.09)      --
Net increase (decrease)                                 0.05          1.26     (0.11)      0.75      (0.33)      0.21
Net asset value, end of period                        $11.83        $11.78    $10.52     $10.63      $9.88     $10.21
Total return (b)                                        9.36%        20.44%     4.21%      9.96%     (2.32)%     2.11%
Ratio to average net assets of (c):
   Expenses, before waivers and reimbursements          1.31%         1.31%     1.37%      1.43%      1.38%      1.47%
   Expenses, net of waivers and reimbursements          1.06%         1.06%     1.06%      1.06%      1.06%      1.04%
   Net investment income, before waivers and
     reimbursements                                     1.33%         0.64%     0.66%      0.36%      0.90%      0.33%
   Net investment income, net of waivers and
     reimbursements                                     1.58%         0.89%     0.97%      0.73%      1.22%      0.76%
Portfolio turnover rate                                85.67%       160.13%   154.62%    202.47%    215.31%     77.79%
Net assets at end of period (in thousands)           $114,123     $111,594  $106,774   $138,182    $148,704   $133,212
</TABLE>

(a) For the period March 28, 1994 (commencement of operations)  through November
30, 1994.
(b)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(c)  Annualized for periods less than a full year.



<PAGE>



Financial Highlights [TO BE UPDATED]
International Growth Portfolio
For the Years Ended November 30,

                                                                         Class D
<TABLE>
<CAPTION>
<S><C>                                                <C>             <C>        <C>        <C>         <C>        <C>

                                                    ----------------------------------------------------------------------------
                                                         For the
                                                       Six Months      For the     For the     For the    For the    For the
                                                      Ended May 31,   Year Ended  Year Ended Year Ended Year Ended  Year Ended
                                                         1999(a)         1998        1997       1996       1995      1994 (b)

Net asset value, beginning of period                     $11.60         $10.39     $10.54      $ 9.83      $10.21     $10.47
Income (loss) from investment operations:
   Net investment income                                  (0.01)          0.09       0.09        0.01        0.19      --
   Net realized and unrealized gain (loss)                 1.00           1.83       0.29        0.92       (0.48)     (0.26)
Total income (loss) from investment operations             0.99           1.92       0.38        0.93       (0.29)     (0.26)
Distributions to shareholders from:
   Net investment income                                  (0.14)         (0.14)     (0.08)      (0.22)      (0.05)     --
   Net realized gain                                      (0.76)         (0.57)     (0.45)       --         (0.04)     --
   Return of capital                                       --            --          --          --         --         --
Total distributions to shareholders                       (0.90)         (0.71)     (0.53)      (0.22)      (0.09)     --
Net increase (decrease)                                    0.09           1.21      (0.15)       0.71       (0.38)     (0.26)
Net asset value, end of period                           $11.69         $11.60     $10.39      $10.54       $9.83     $10.21
Total return (c)                                           9.18%         19.91%      3.79%       9.59%      (2.78)%    (2.56)%
Ratio to average net assets of (d):
   Expenses, before waivers and reimbursements             1.70%          1.70%      1.76%       1.82%       1.77%      1.78%
   Expenses, net of waivers and reimbursements             1.45%          1.45%      1.45%       1.45%       1.45%      1.35%
   Net investment income (loss), before waivers and
     Reimbursements                                       (0.34)%         0.34%      0.27%       0.07%       1.69%     (0.43)%
   Net investment income, net of waivers and
     Reimbursements                                       (0.09)%         0.59%      0.58%       0.44%       2.01%     --
Portfolio turnover rate                                   85.67%        160.13%    154.62%     202.47%     215.31%     77.79%
Net assets at end of period (in thousands)                 $10           $203        $234        $94        $20        --
</TABLE>

(a) Financial  highlights for the six months ended May 31, 1999 were  calculated
using average shares outstanding for the period. (b) For the period November 16,
1994 (Class D Shares issue date) through November 30, 1994.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return is not annualized for periods less than one year.
(d)  Annualized for periods less than a full year.


<PAGE>



Financial Highlights [TO BE UPDATED]
International Equity Index Portfolio
For the Years Ended November 30,
<TABLE>
<CAPTION>
<S>                                                                <C>                               <C>

                                                                   Class A                            Class D
</TABLE>
<TABLE>
<CAPTION>
<S><C>                                            <C>               <C>           <C>        <C>           <C>

                                                  ----------------------------    --------------------------------
                                                      For the
                                                    Six Months       For the      For the      For the      For the
                                                   Ended May 31,    Year Ended    Year Ended  Year Ended    Year Ended
                                                       1999          1998         1997(a))      1999         1998 (b)

Net asset value, beginning of period                  $11.98        $10.55        $10.00       $11.97        $9.88
Income from investment operations:
   Net investment income                                0.10          0.14          0.10         0.08        --
   Net realized and unrealized gain                     0.35          1.46          0.45         0.34         2.09
Total income from investment operations                 0.45          1.60          0.55         0.42         2.09
Distributions to shareholders from:
   Net investment income (loss)                        (0.24)        (0.17)        --           (0.23)       --
   Net realized gain                                   (0.54)         --           --           (0.54)       --
   Return of capital                                    --            --           --           --           --
Total distributions to shareholders                    (0.78)        (0.17)        --           (0.77)       --
Net increase                                           (0.33)         1.43          0.55        (0.35)        2.09
Net asset value, end of period                        $11.65        $11.98        $10.55       $11.62       $11.97
Total return (c)                                        3.84%        15.50%         5.45%        3.61%       21.15%
Ratio to average net assets of (d):
   Expenses, before waivers and reimbursements          0.93%         1.00%         1.08%        1.32%        1.39%
   Expenses, net of waivers and reimbursements          0.52%         0.55%         0.51%        0.91%        0.94%
   Net investment income (loss), before waivers         1.13%         0.91%         1.18%        0.74%       (0.80)%
and reimbursements
   Net investment income (loss), net of waivers         1.54%         1.36%         1.75%        1.15%       (0.11)%
and reimbursements
Portfolio turnover rate                                 8.71%        41.53%         8.16%        8.71%       41.53%
Net assets at end of period (in thousands)            $45,315       $44,940      $34,244        $12          $12
</TABLE>

(a) For the period April 1, 1997  (commencement of operations)  through November
30, 1997. (b) For the period October 5, 1998 (Class D Shares issue date) through
November 30, 1998.
(c)  Assumes  investment  at net asset  value at the  beginning  of the  period,
     reinvestment of all dividends and distributions,  and a complete redemption
     of the  investment  at the net asset value at the end of the period.  Total
     return  is not  annualized  for  periods  less  than  one year and does not
     reflect  the 1.00%  additional  transaction  fee which would  reduce  total
     return.
(d)  Annualized for periods less than a full year.


<PAGE>


22



For More Information

ANNUAL/SEMIANNUAL REPORT

Additional  information  about the  Portfolios'  investments is available in the
Portfolios' annual and semi-annual  reports to shareholders.  In the Portfolios'
annual  reports,  you  will  find a  discussion  of the  market  conditions  and
investment  strategies that significantly  affected the Portfolios'  performance
during their last fiscal year.

STATEMENT OF ADDITIONAL INFORMATION

Additional information about the Portfolios and their policies is also available
in the  Portfolios'  Statement of  Additional  Information  ("SAI").  The SAI is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The Portfolios' annual and semiannual  reports,  and the SAI, are available free
upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:
By telephone - Call 1-800-637-1380
By mail - Northern Institutional Funds
           P.O. Box 75943
           Chicago, IL  60675-5943

On the Internet - Text-only versions of the Portfolios'  documents are available
on line and may be downloaded from the SEC's website at http://www.sec.gov

     You may review and obtain  copies of Trust  documents by visiting the SEC's
Public  Reference Room in  Washington,  D.C. You may also obtain copies of Trust
documents  by sending  your  request and a  duplicating  fee to the SEC's Public
Reference  Section,  Washington,  D.C.  20549-0102 or by  electronic  request at
[email protected].  Information  on the operation of the Public  Reference Room
may be obtained by calling the SEC at 1-202-942-8090.

                                     [LOGO]

811-3605


<PAGE>







Northern Institutional Funds
Money Market Portfolios
Shares

      Government Select Portfolio
      Government Portfolio
      Diversified Assets Portfolio
      Tax-Exempt Portfolio
      Municipal Portfolio


Prospectus dated April 1, 2000






An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.

The  Securities and Exchange  Commission  has not approved or disapproved  these
securities or passed upon the adequacy of this Prospectus. Any representation to
the contrary is a criminal offense.






<PAGE>



Contents

<TABLE>
<CAPTION>
<S><C>                                                 <C>                                                 <C>     <C>
                                                                                                                   Page
- ------------------------------------------------------ ------------------------------------------------------------------
Risk/Return Summary                                    Portfolios
Information about the objectives, principal            o    Government Select Portfolio                               X
strategies and risk characteristics of each Portfolio  o    Government Portfolio                             X
                                                       o    Diversified Assets Portfolio                              X
                                                       o    Tax-Exempt Portfolio                             X
                                                       o    Municipal Portfolio
                                                                          X


                                                       Principal Investment
                                                       Strategies and Risks

                                                       Portfolio Performance                                          X
                                                       o    Government Select Portfolio                               X
                                                       o    Government Portfolio                             X
                                                       o    Diversified Assets Portfolio                              X
                                                       o    Tax-Exempt Portfolio                             X
Management of the Portfolios                           o    Municipal Portfolio
Details that apply to the Portfolios as a group                           X


                                                       Portfolio Fees and Expenses                                    X

                                                       Investment Adviser                                             X
                                                       Advisory Fees
                                                                                       X
                                                       Portfolio Management                                           X
                                                       Other Portfolio Services                              X

About Your Account                                     Purchasing and Selling Shares                             X
How to open, maintain and close an account             o    Investors                                                 X
                                                       o    Share Classes                                    X
                                                       o    Opening an Account
                                                                     X
                                                       o    Selling Shares
                                                                     X

                                                       Account Policies and Other Information                X
                                                       o    Automatic Investment Arrangements                         X
                                                       o    Purchase and Redemption Minimums                 X
                                                       o    Calculating Share Price                                   X
                                                       o    Timing of Purchase Requests                      X
                                                       o    Tax Identification Number                                 X
                                                       o    In-Kind Purchases and Redemptions                         X
                                                       o    Miscellaneous Purchase Information                        X
                                                       o    Timing of Redemption and Exchange Requests       X
                                                       o    Miscellaneous Redemption Information             X
                                                       o    Exchange Privileges                                       X
                                                       o    Telephone Transactions                           X
                                                       o    Advance Notification of Large Transactions                X
                                                       o    Making Changes to Your Account Information       X
                                                       o    Business Day                                     X
                                                       o    Early Closings                                            X
                                                       o    Authorized Intermediaries                                 X
                                                       o    Information About Institutions                   X


                                                       Distributions and Taxes                               X
                                                       o    Distributions                                    X
                                                       o    Taxes                                                     X
                                                       o    Other Tax Information                            X

                                                       Year
                                                       2000
                                                       X

Risks, Securities and Techniques                       Risks, Securities and
                                                                        Techniques                                  X

Appendix                                               Portfolio Financial Highlights
                                                                                       X

For More Information                                   Annual/Semiannual Reports                             X
                                                       Statement of Additional Information                   X
- ------------------------------------------------------ ------------------------------------------------------------------
</TABLE>





<PAGE>




Northern  Institutional  Funds (the  "Trust")  offers  five  money market
portfolios  (each a "Portfolio") to institutional  investors.  Each Portfolio is
authorized to offer three classes of shares:  Shares, Service Shares and Premier
Shares.   Service   Shares  and  Premier   Shares  are   described  in  separate
prospectuses.


The  descriptions  on the following pages may help you choose the Portfolio that
best fits your investment  needs. Keep in mind,  however,  that no Portfolio can
guarantee  it will meet its  investment  objective  and no  Portfolio  should be
relied upon as a complete investment program.  The Trust's six fixed income, one
balanced  and  nine   equity  portfolios  are  described  in  a  separate
prospectus.

     The  Portfolios  seek to  maintain  a stable  net asset  value of $1.00 per
share. Consistent with this policy, each of the Portfolios:

     Limits its  dollar-weighted  average portfolio maturity to 90 days or less;
Buys  securities  with  remaining  maturities  of 397 days or less  (except  for
certain  variable and floating rate  instruments and securities  collateralizing
repurchase agreements);  and Invests only in U.S. dollar-denominated  securities
that represent minimal credit risks.

In addition,  each Portfolio limits its investments to "Eligible  Securities" as
defined by the Securities and Exchange Commission  ("SEC").  Eligible Securities
include,  generally,  securities that either (a) have short-term debt ratings at
the time of purchase in the two highest  rating  categories or (b) are issued or
guaranteed by, or otherwise  allow a Portfolio to demand payment from, an issuer
with those ratings. Securities that are unrated (including securities of issuers
that have  long-term  but not  short-term  ratings) may be deemed to be Eligible
Securities  if  determined  to be of  comparable  quality by The Northern  Trust
Company under the direction of the Board of Trustees. Securities that are in the
highest  short-term  rating  category (and  comparable  unrated  securities) are
called  "First Tier  Securities."  Under normal  circumstances,  the  Government
Select,  Government and Diversified  Assets Portfolios intend to limit purchases
of securities to First Tier  Securities.  Securities in which the Portfolios may
invest  may not earn as high a level of income  as  long-term  or lower  quality
securities,  which  generally have greater  market risk and more  fluctuation in
market value.

In addition to the  instruments  described  above and on the pages  below,  each
Portfolio  may use  various  investment  techniques  in seeking  its  investment
objective.  You can learn more  about  these  techniques  and  related  risks by
reading  "Risks,  Securities  and  Techniques"  beginning  on page  [XX] of this
Prospectus and the Statement of Additional Information.




<PAGE>


Government Select Portfolio

Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.


Principal Investment Strategies and Risks

Investment Strategies
The Portfolio seeks its objective by investing  exclusively in securities issued
or guaranteed as to principal and interest by the U.S. government,  its agencies
or instrumentalities. Under normal market conditions, the Portfolio will seek to
acquire  only  those  U.S.  government  securities  the  interest  upon which is
generally   exempt  from  state  income  taxation.   These  securities   include
obligations issued by the U.S. Treasury and certain U.S. government agencies and
instrumentalities,  such as the  Federal  Home  Loan Bank and the  Federal  Farm
Credit Banks Funding Corp.

When  appropriate  securities which are exempt from state taxes are unavailable,
the Portfolio may also invest in non-exempt U.S. government  securities and cash
equivalents  including  money market funds and time  deposits with a maturity of
three months or less, and hold uninvested cash.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk, prepayment (or call) risk, debt extension risk, Government securities
risk,  guarantor (or credit enhancement) risk,  management risk, liquidity risk,
and Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.



<PAGE>



Government Portfolio


Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.


Principal Investment Strategies and Risks

Investment Strategies

The  Government  Portfolio  seeks its  objective  by  investing  exclusively  in
marketable  securities  issued or guaranteed as to principal and interest by the
U.S. government,  its agencies or  instrumentalities,  and repurchase agreements
backed  by such  securities.  The  Portfolio  may also hold  custodial  receipts
representing  interests in U.S. government  securities.  Risks These primary
investment  risks apply to the Portfolio:  stable NAV risk,  interest rate risk,
prepayment (or call) risk,  debt extension  risk,  Government  securities  risk,
guarantor (or credit  enhancement)  risk,  management risk,  liquidity risk, and
Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.




<PAGE>



Diversified Assets Portfolio

Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.

Principal Investment Strategies and Risks

Investment Strategies
The  Diversified  Assets  Portfolio  seeks its objective by investing in a broad
range of government,  bank and commercial  obligations that are available in the
money markets, including:

          U.S. dollar-denominated obligations of U.S. banks with total assets in
     excess of $1 billion  (including  obligations  of foreign  branches of such
     banks);

          U.S. dollar-denominated  obligations of foreign commercial banks where
     such banks have total assets in excess of $5 billion;

          High  quality   commercial  paper  and  other  obligations  issued  or
     guaranteed by U.S. and foreign corporations and other issuers;

          Corporate bonds,  notes,  paper and other instruments that are of high
     quality;

          Asset-backed securities;

          Securities  issued or  guaranteed  as to principal and interest by the
     U.S.  government  or by its  agencies or  instrumentalities  and  custodial
     receipts with respect thereto;

          U.S. dollar-denominated securities issued or guaranteed by one or more
     foreign    governments    or    political    subdivisions,    agencies   or
     instrumentalities;

          Repurchase agreements relating to the above instruments; and

          Municipal   securities   issued  or   guaranteed  by  state  or  local
     governmental bodies.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk,  credit (or default) risk,  guarantor (or credit  enhancement)  risk,
management risk, liquidity risk,  prepayment (or call) risk, debt extension risk
and Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.






<PAGE>



Tax-Exempt Portfolio

Investment Objective

The Portfolio seeks to provide its  shareholders,  to the extent consistent with
the  preservation  of capital and prescribed  portfolio  standards,  with a high
level of income  exempt  from  Federal  income  tax by  investing  primarily  in
municipal instruments.


Principal Investment Strategies and Risks

Investment Strategies
The  Portfolio  seeks  to  achieve  its  objective  by  investing  primarily  in
high-quality  short-term  instruments,  the  interest  on which is  exempt  from
Federal income tax ("municipal instruments"). These may include:

          Fixed and variable rate notes and similar debt instruments;

          Tax-exempt commercial paper;

          Rated and unrated municipal bonds, notes, paper or other instruments;
           and

          Municipal bonds and notes which are guaranteed as to principal and
          interest or backed by the U.S. government or its agencies or
          instrumentalities.

Under normal market conditions,  at least 80% of the Portfolio's net assets will
be invested in municipal  instruments.  Interest  earned by the Portfolio on AMT
obligations  ("private  activity bonds") the interest on which may be treated as
an item of tax preference to shareholders under the Federal  alternative minimum
tax, will not be deemed to have been derived from municipal  instruments for the
purposes  of  determining   whether  the  Portfolio   meets  this  policy.   For
shareholders subject to AMT, a limited portion of the Portfolio's  dividends may
be subject to Federal tax.

During extraordinary circumstances,  however, the Portfolio may take a temporary
defensive  posture and hold  uninvested  cash or invest in AMT  obligations  and
taxable short-term securities without limitation.

Taxable  investments will consist  exclusively of those  instruments that may be
purchased by the Diversified Assets Portfolio including U.S.  dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and custodial  receipts with respect thereto;  and repurchase
agreements relating to the above instruments.  Risks These primary investment
risks apply to the Portfolio:  stable NAV risk,  interest rate risk,  credit (or
default)  risk,  guarantor  (or  credit  enhancement)  risk,   management  risk,
liquidity   risk,    prepayment   (or   call)   risk,   debt   extension   risk,
project/industrial development bond risk, tax risk and Year 2000 risk. These and
other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.




<PAGE>


Municipal Portfolio

Investment Objective

The Portfolio seeks to provide,  to the extent  consistent with the preservation
of capital,  a high level of income  exempt from regular  Federal  income tax by
investing  primarily in municipal  instruments.  This  objective  may be changed
without shareholder approval.

Principal Investment Strategies and Risks

Investment Strategies
The  Portfolio  seeks  to  achieve  its  objective  by  investing  primarily  in
high-quality  short-term municipal instruments.  The high level of income sought
by the  Portfolio is relative to yields  currently  available in the  tax-exempt
market place. Municipal instruments are debt instruments,  the interest on which
is exempt from regular Federal income tax. These may include:

          Fixed, variable and floating rate notes and bonds;

          Asset-backed securities;

          Tax-exempt commercial paper;

          Municipal bonds, notes, paper or other instruments; and

          Muncipal bonds and notes which are guaranteed as to principal and
          interest or backed by the U.S. government or its agencies or
          instrumentalities.

Under normal  circumstances,  at least 80% of the Portfolio's net assets will be
invested in municipal instruments. Subject to this limitation, the Portfolio may
hold  uninvested  cash and  invest  in  taxable  instruments.  During  temporary
defensive periods,  however, all or any portion of the Portfolio's assets may be
held uninvested or invested in taxable instruments.

The Portfolio is not limited in the amount of its assets that may be invested in
AMT obligations  ("private activity bonds") the interest on which may be treated
as an item of tax  preference  to  shareholders  under the  Federal  alternative
minimum  tax.  For  shareholders  subject to AMT, a  significant  portion of the
Portfolio's  dividends  may be subject to Federal  tax. The  Portfolio  does not
currently intend to invest in AMT obligations.  The Portfolio retains,  however,
the ability to invest any or all of its assets in AMT obligations, and may do so
in the future.

Taxable investments will normally consist of U.S. dollar-denominated obligations
of U.S. banks,  foreign  commercial banks and securities issued or guaranteed by
foreign  governments;  high quality commercial paper;  other  obligations,  high
quality  corporate bonds and notes;  securities issued or guaranteed by the U.S.
government,  its  agencies or  instrumentalities  and  custodial  receipts  with
respect thereto; and repurchase agreements relating to the above instruments.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk,  credit (or default) risk,  guarantor (or credit  enhancement)  risk,
management risk, liquidity risk, prepayment (or call) risk, debt extension risk,
project/industrial development bond risk, tax risk and Year 2000 risk. These and
other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.



<PAGE>


Principal Investment Risks

All  investments  carry some  degree of risk  which  will  affect the value of a
Portfolio's  investments,  investment  performance,  yield  and the price of its
shares.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.

The following summarizes the principal risks that may affect the Portfolios.


Risks that apply to ALL Portfolios:


     Stable  NAV  risk is the risk that a Portfolio  will not be able to
maintain a net asset value per share of $1.00 at all times.

      Interest  rate risk is the risk that  during  periods  of rising  interest
     rates, a Portfolio's  yield (and the market value of its  securities)  will
     tend to be lower  than  prevailing  market  rates;  in  periods  of falling
     interest  rates,  a  Portfolio's   yield  (and  the  market  value  of  its
     securities) will tend to be higher.


     Guarantor  (or  Credit  enhancement)  risk is the risk that  changes in
     credit  quality  of a U.S.  or  foreign  bank,  insurance  company or other
     financial  institution could cause a Portfolio's  investments in securities
     backed by letters  of credit or other  credit  enhancements  issued by such
     bank or institution to decline in value.

      Management  risk  is the  risk  that a  strategy  used  by the  investment
management team may fail to produce the intended results.

      Liquidity  risk  is the  risk  that a  Portfolio  will  not be able to pay
     redemption  proceeds on the same  Business  Day that  shares are  redeemed,
     because  of  unusual  market  conditions,   an  unusually  high  volume  of
     redemption requests or other reasons.

     Year 2000 risk is the risk that a  Portfolio's  operations or value will be
adversely affected by the "Year 2000 Problem." (For more information, please see
"Year 2000 Issues" on page [xx]).

Risk that applies primarily to the Government Select and Government Portfolios:

     Government  securities  risk is the risk that the U.S.  government will not
provide  financial support to U.S.  government  agencies,  instrumentalities  or
sponsored enterprises if it is not obligated to do so by law.


     Risks  that apply  primarily  to the  Diversified  Assets,  Tax-Exempt  and
Municipal Portfolios:

      Credit  (or  Default)  risk is the risk  that an  issuer  of fixed  income
     securities  held by the  Portfolio  may  default on its  obligation  to pay
     interest and repay principal.  Generally,  the lower the credit rating of a
     security, the greater the risk that the issuer of the security will default
     on its obligation.  High quality  securities are generally believed to have
     relatively low degrees of credit risk.

      Prepayment  (or Call) risk is the risk that an issuer  will  exercise  its
     right to pay  principal on an  obligation  held by a Portfolio  (such as an
     asset-backed  security)  earlier than  expected.  This may happen  during a
     period of declining interest rates. Under these circumstances,  a Portfolio
     may be unable to recoup all of its initial  investment and will suffer from
     having  to  reinvest  in lower  yielding  securities.  The  loss of  higher
     yielding securities and the reinvestment at lower interest rates can reduce
     a Portfolio's income.

      Debt  extension risk is the risk that an issuer will exercise its right to
     pay  principal  on  an  obligation  held  by  the  Portfolio  (such  as  an
     asset-backed security) later than expected. This may happen during a period
     of rising  interest  rates.  Under  these  circumstances,  the value of the
     obligation  will decrease and a Portfolio will suffer from the inability to
     invest in higher yielding securities.



Risks that apply to the Tax-Exempt and Municipal Portfolios:


      Project/industrial  development bond risk is the risk that a Portfolio may
     be more sensitive to an adverse economic, business or political development
     if it invests  more than 25% of its  assets in  municipal  instruments  the
     interest upon which is paid solely from revenues of similar projects, or in
     industrial development bonds.

      Tax risk is the risk that future legislative or administrative  changes or
     court  decisions may materially  affect the ability of the Portfolio to pay
     tax-exempt dividends.

More  information  about the risks of investing in the Portfolios is provided in
"Risks,  Securities and Techniques" beginning on page [XX]. You should carefully
consider the risks discussed in these sections before investing in a Portfolio.


Portfolio Performance

The bar charts and tables  that  follow  provide an  indication  of the risks of
investing in a Portfolio by showing  changes in the performance of a Portfolio's
Shares  from year to year.  The bar  charts and tables  assume  reinvestment  of
dividends and  distributions.  A Portfolio's past performance is not necessarily
an  indication  of how the  Portfolio  will  perform in the future.  Performance
reflects  certain  expense  limitations  (as set forth in the  Footnotes  to the
"Portfolio  Fees and Expenses" table on page [ ]) that were in effect during the
periods  presented.  If expense  limitations  were not in place,  a  Portfolio's
performance would have been reduced. The bar charts and tables have been omitted
for the Municipal Portfolio because the Portfolio has been in operation for less
than one calendar year.



<PAGE>



 Government Select Portfolio

                                                   [Bar Chart]
                                                  Calendar Year Total Return

<TABLE>
<CAPTION>
<S>                                            <C>           <C>
                                               1991:         5.95%
                                               1992:         3.68%
                                               1993:         3.04%
                                               1994:         4.09%
                                               1995:         5.82%
                                               1996:         5.29%
                                               1997:         5.44%
                                               1998:         5.40%
                                               1999:         [ XXX]%
</TABLE>


Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[XX]                [  ]%
Worst Quarter Return:               Q[ ] `[XX]                [  ]%

           Average Annual Total Return (for the periods ended December 31, 1999)

<TABLE>
<CAPTION>
<S><C>                         <C>                 <C>                 <C>

                               1-Year              5-Year              Since Inception (11/7/90)
 Government Select Portfolio   [  ]%               [  ]%                [  ]%
</TABLE>

The 7-day yield for Shares of  the Portfolio as of December 31, 1999:  [  ]%.
You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>



Government Portfolio


                                                     [Bar Chart]

                                                 Calendar Year Total Return

                                               1989:         9.00%
                                               1990:         8.13%
                                               1991:         6.10%
                                               1992:         3.84%
                                               1993:         2.94%
                                               1994:         3.93%
                                               1995:         5.65%
                                               1996:         5.17%
                                               1997:         5.34%
                                               1998:         5.30%
                                               1999:         [XXX]%


Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[  ]                           [XXX]%
Worst Quarter Return:               Q[ ] `[  ]                           [XXX}%

          Average Annual Total Return (for the periods ended December 31, 1999)


                         1-Year   5-Year    10-Year   Since Inception (10/29/85)
 Government Portfoli     [  ]%    [  ]%     [  ]%     [ ]%

The 7-day yield for Shares of  the Portfolio as of December 31, 1999:  [  ]%.
You may call 1-800-637-1380 to obtain the current 7-day yield.





<PAGE>


Diversified Assets Portfolio


                                                  [Bar Chart]

                                             Calendar Year Total Return

                                               1989:         9.35%
                                               1990:         8.27%
                                               1991:         6.14%
                                               1992:         3.71%
                                               1993:         3.02%
                                               1994:         4.05%
                                               1995:         5.79%
                                               1996:         5.28%
                                               1997:         5.45%
                                               1998:         5.40%
                                               1999:         [XXX]%


Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[  ]                          [XXX]%
Worst Quarter Return:               Q[ ] `[  ]                          [XXX]%


           Average Annual Total Return (for the periods ended December 31, 1999)

                              1-Year  5-Year 10-Year  Since Inception (7/27/82)
Diversified Assets Portfolio  [  ]%   [  ]%  [  ]%    [ ]%

The 7-day yield for Shares of  the Portfolio as of December 31, 1999:  [  ]%.
You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>



Tax-Exempt Portfolio


                                                     [Bar Chart]

                                               Calendar Year Total Return

                                               1989:         6.23%
                                               1990:         5.86%
                                               1991:         4.54%
                                               1992:         2.91%
                                               1993:         2.27%
                                               1994:         2.61%
                                               1995:         3.73%
                                               1996:         3.33%
                                               1997:         3.45%
                                               1998:         3.29%
                                               1999:         [XXX]%


Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[  ]                           [XXX]%
Worst Quarter Return:               Q[ ] `[  ]                          [XXX]%

           Average Annual Total Return (for the periods ended December 31, 1999)

<TABLE>
<CAPTION>
<S>                         <C>                        <C>                <C>                 <C>          <C>
                                                       1-Year             5-Year              10-Year      Since Inception (8/12/83)
                            Tax-Exempt Portfolio       [  ]%              [  ]%               [  ]%                           [ ]%
</TABLE>

The 7-day yield for Shares of  the Portfolio as of December 31, 1999:  [  ]%.
You may call 1-800-637-1380 to obtain the current 7-day yield.







<PAGE>


Portfolio Fees and Expenses

This table  describes the fees and expenses that you may pay if you buy and hold
Shares of the Portfolios. Please note that it does not reflect any charges which
may be imposed by The Northern  Trust  Company,  its  affiliates,  correspondent
banks and other institutions on their Customers (as defined on page [ ]).
(For more information,  please see "Account  Policies and Other  Information" on
page [ ].)

<TABLE>
<CAPTION>
<S><C>                                                     <C>                <C>         <C>                <C>           <C>
                                                           Government Select  Government  Diversified Assets  Tax-Exempt   Municipal

Shareholder Fees (fees paid directly from your investment)
    Sales Charge (Load) Imposed on Purchases.............. None               None         None                None        None
    Deferred Sales Charge (Load)                           None               None         None                None        None
    Sales Charge (Load) Imposed on Reinvested              None               None         None                None        None
Distributions.....................................
    Redemption Fees....................................... None               None         None                None        None
    Exchange Fees......................................... None               None         None                None        None

Annual Portfolio Operating Expenses (expenses that are
deducted
     from Portfolio assets)1
    Management Fees2.......................................0.25%              0.25%        0.25%               0.25%        0.25%
    Distribution (12b-1) Fees............................. None               None         None                None         None
    Other Expenses3....................................... 0.13%              0.13%        0.14%               0.14%        0.13%

    Total Annual Portfolio Operating Expenses4............ 0.38%              0.38%        0.38%               0.39%        0.39%
</TABLE>















<PAGE>



- --------------------------------
         Footnotes

     1 The Municipal  Portfolio's  annual operating expenses are based on actual
fees and estimated expenses for the current fiscal year.

2        For the fiscal year ended November 30, 1999, The Northern Trust Company
         voluntarily  waived a portion of its management fees for the Government
         Select and Municipal Portfolios. As a result of the fee waivers, actual
         management fees paid by the Government Select and Municipal  Portfolios
         were 0.10% of each  Portfolio's  average daily net assets.  Fee waivers
         may be  terminated  at any time at the  option  of the  Northern  Trust
         Company.

3        "Other Expenses" include  administration or co-administration  fees and
         all other  ordinary  operating  expenses of each  Portfolio  not listed
         above.  For the fiscal year ended November 30, 1999,  Goldman,  Sachs &
         Co.  ("Goldman  Sachs")  was  entitled to an  administration  fee at an
         annual rate of 0.10% of the average daily net assets of each Portfolio.
         During the same period,  Goldman Sachs reimbursed  expenses  (including
         administration fees, but excluding management and transfer agency fees,
         servicing fees and certain extraordinary expenses) which exceeded on an
         annualized basis 0.10% of each Portfolio's average daily net assets. As
         a result of the expense reimbursement,  actual other operating expenses
         paid by the  Government,  Government  Select,  Diversified  Assets  and
         Tax-Exempt  Portfolios were 0.10% of each Portfolio's average daily net
         assets.  On May 1, 1999,  The Northern Trust Company  ("Northern")  and
         PFPC Inc.,  formerly First Data Investor  Services Group, Inc. ("PFPC")
         replaced  Goldman Sachs as the Portfolios'  co-administrators,  and are
         entitled to a  co-administration  fee from the Portfolios at the annual
         rates set forth above. Under their Co-Administration Agreement with the
         Trust,  which  may  be  amended  without  shareholder   approval,   the
         co-administrators   have  agreed  indefinitely  to  reimburse  expenses
         (including fees payable to Northern and PFPC as co-administrators,  but
         excluding  management  fees,  transfer agency fees,  servicing fees and
         extraordinary  expenses)  which exceed on an annualized  basis 0.10% of
         each Portfolio's  average daily net assets.  As a result of the expense
         reimbursement, "Other Expenses" are currently 0.10% of each Portfolio's
         average daily net assets.

4        As a result of the fee waivers and expense  reimbursements,  the actual
         management  fees,  distribution  (12b-1) fees, other expenses and total
         annual operating  expenses for each Portfolio for the fiscal year ended
         November 30, 1999 were as set forth below.  Fee waivers (and  voluntary
         expense reimbursements, if applicable) may be terminated at any time at
         the  option  of  Northern.  If this  occurs,  "Total  Annual  Portfolio
         Operating Expenses" may increase without shareholder approval.
<TABLE>
<CAPTION>
<S><C>                 <C>                   <C>                <C>                   <C>

Shares                                                                                 Total Annual
                       Management            Distribution                              Operating Expenses
                       Fees                  (12b-1) Fees        Other Expenses

Government Select      0.10%                 0.00%               0.10%                 0.20%
Government             0.25%                 0.00%               0.10%                 0.35%
Diversified Assets     0.25%                 0.00%               0.10%                 0.35%
Tax-Exempt             0.25%                 0.00%               0.10%                 0.35%
Municipal              0.10%                 0.00%               0.10%                 0.20%
</TABLE>








<PAGE>



Example

The  following  Example is intended to help you compare the cost of investing in
Shares of a Portfolio (without fee waivers and expense  reimbursements) with the
cost of investing in other mutual funds.

The Example  assumes that you invest $10,000 in a Portfolio for the time periods
indicated (with reinvestment of all dividends and distributions) and then redeem
all of your Shares at the end of those  periods.  The Example  also assumes that
your  investment  has a 5%  return  each year and that a  Portfolio's  operating
expenses  remain the same.  Although  your actual  costs may be higher or lower,
based on these assumptions your costs would be:

<TABLE>
<CAPTION>
<S><C>                                                        <C>         <C>          <C>           <C>

Portfolio                                                     1 Year       3 Years      5 Years       10 Years

Government Select
     Shares.............................................       $39           $122         $213         $480

Government
     Shares.............................................       $39           $122         $213         $480

Diversified Assets
     Shares.............................................       $39           $122         $213         $480

Tax-Exempt
     Shares.............................................       $40           $125         $219         $493

Municipal
     Shares.............................................       $40           $125        $219          $493
</TABLE>




<PAGE>


39


                          MANAGEMENT OF THE PORTFOLIOS

Investment Adviser

The Northern Trust Company ("Northern" or the "Investment Adviser"), an Illinois
state-chartered  bank and  member  of the  Federal  Reserve  System,  serves  as
investment  adviser for the Portfolios.  The Investment Adviser is located at 50
South LaSalle Street,  Chicago,  Illinois 60675 and is a wholly-owned subsidiary
of Northern Trust Corporation,  a bank holding company. As of December 31, 1999,
Northern Trust  Corporation and its subsidiaries had  approximately $[ ] billion
in assets, $[ ] billion in deposits and employed over [ ] persons.


Northern  has for more  than 100 years  managed  the  assets of  individuals,
charitable   organizations,   foundations  and  large  corporate  investors.
Northern and its affiliates  administrated in various  capacities  (including as
master trustee,  investment manager or custodian) approximately $[ ] trillion of
assets as of December 31, 1999,  including  approximately $[ ] billion of assets
for which Northern and its affiliates had investment management  responsibility.
Under its Advisory Agreement with the Trust, the Investment Adviser,  subject to
the general  supervision of the Trust's Board of Trustees,  is  responsible  for
making investment decisions for the Portfolios and for placing purchase and sale
orders for portfolio securities.

Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses,  the  Investment  Adviser  is  entitled  to an  advisory  fee from the
Portfolios, computed daily and payable monthly, at annual rates set forth in the
table below  (expressed as a percentage of each Portfolio's  respective  average
daily net assets).  The table also reflects the advisory  fees (after  voluntary
fee waivers) paid by the Portfolios as a percentage of net assets for the fiscal
year ended November 30, 1999.
<TABLE>
<CAPTION>
<S><C>                                                    <C>                    <C>

Portfolio                                                                         Advisory Fee Paid
                                                                                   For Fiscal Year
                                                          Contractual Rate          Ended 11/30/99
Government Select.................................             0.25%                    0.10%
Government........................................             0.25%                    0.25%
Diversified Assets................................             0.25%                    0.25%
Tax-Exempt........................................             0.25%                    0.25%
Municipal.........................................             0.25%                     N/A
</TABLE>

The difference,  if any,  between the  contractual  advisory fees and the actual
advisory fees paid by the Portfolios  reflects that the  Investment  Adviser did
not  charge  the full  amount of the  advisory  fees to which it would have been
entitled.  The  Investment  Adviser  may  discontinue  or modify  its  voluntary
limitations in the future at its discretion.

Portfolio Management

     The Investment Adviser employs a team approach to the investment management
of the Portfolios, relying upon investment professionals under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern.  Mr. Snyder  oversees the  management of all fixed income,  equity and
money  market  assets  managed by the  Investment  Adviser.  Mr.  Snyder  joined
Northern Trust in 1980.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer Agent") and custodian for each
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its  services in those  capacities  are  described in the
Statement of Additional Information.  Northern and PFPC act as co-administrators
for  each  Portfolio.  The  fees  that  Northern  and  PFPC  receive  for  their
co-administrative  services are described on page [ ] under  "Portfolio Fees and
Expenses."


                               ABOUT YOUR ACCOUNT

Purchasing and Selling Shares

Investors

Institutional  investors,  which are  acting on their own behalf or on behalf of
their customers,  clients, employees,  participants and others ("Customers") may
invest in the Shares of each Portfolio through their  institutional  accounts at
Northern or an affiliate.  They may also  establish  accounts  directly with the
Trust. There is no sales charge imposed on investments.  Institutional investors
("Institutions") include:


               Northern and its affiliates;
               Defined  contribution plans having at least $30 million in assets
               or  annual  contributions  of at  least  $5  million;  and  Other
               institutions and organizations.

Share Classes

     Each Portfolio offers three classes of shares:  Shares,  Service Shares and
Premier  Shares.  Service  Shares and Premier  Shares are  described in separate
prospectuses.

      Shares do not provide for payments by the  Portfolio to  Institutions  for
administrative support or shareholder liaison services.

      Service Shares are designed for Institutions that agree with the Portfolio
     to  provide  (or  arrange  for the  provision  of)  administrative  support
     services to Customers.

      Premier Shares are designed for Institutions that agree with the Portfolio
     to provide (or arrange for the  provision  of)  administrative  support and
     shareholder liaison services to Customers.

Shares of each class bear their pro rata portion of all operating  expenses paid
by a  Portfolio,  except  amounts  payable  under the Service Plan that has been
adopted  for the  Portfolio's  Service  Shares and Premier  Shares and  transfer
agency fees. Because of these  class-specific  expenses,  the performance of the
Shares of a Portfolio described in this Prospectus is expected to be higher than
the  performance  of both the  Service  Shares  and  Premier  Shares of the same
Portfolio and the performance of a Portfolio's  Service Shares is expected to be
higher than the performance of the same Portfolio's Premier Shares.


Opening an Account

You may purchase Shares of each Portfolio through your institutional  account at
Northern (or an  affiliate)  or you may open an account  directly with the Trust
with a minimum initial investment of $5 million in one or more portfolios of the
Trust.  This  minimum does not apply,  however,  to Shares  purchased  through a
Northern cash sweep program. There is no minimum for subsequent investments.


Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  Shares  through your  account,  contact your  Northern
representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase Shares directly from the Trust as described in this Prospectus.


     By Mail. Read this Prospectus carefully.  Complete and sign the new account
application.  Include a  certified  corporate  resolution  (or other  acceptable
evidence of authority).  Enclose a check or Federal Reserve draft payable to the
specific  Portfolio.  If investing in more than one Portfolio,  please include a
separate  check for each.  Mail your check,  corporate  resolution and completed
application to: Northern Institutional Funds c/o The Northern Trust Company P.O.
Box 75943 Chicago, Illinois 60675-5943

     All checks must be payable in U.S.  dollars and drawn on a bank  located in
the United States. Cash and third party checks are not acceptable.

     By Telephone.
               Read  this  Prospectus  carefully.  Call  the  Transfer  Agent at
               1-800-637-1380.
      To open a new account please provide:
                   The name of the  Portfolio  in which you'd like to invest The
                   number of Shares or dollar  amount to be invested  The method
                   of payment
      To add to an existing account, please provide:
                   The Institution's name
                   Your Account Number

     By Wire or Automated Clearing House Transfer ("ACH Transfer").
      To open a new account:
               Call the Transfer Agent at 1-800-637-1380  for  instructions.  To
      add to an existing account:
               Have your bank wire Federal funds or effect an ACH Transfer to:

                               The Northern Trust Company
                               Chicago, Illinois
                               ABA Routing No. 0710-00152
                               (Reference 10 Digit Portfolio Account No.)
                               (Reference Shareholder's Name)

For more  information  about the purchase of Shares,  call the Transfer Agent at
1-800-637-1380.

Selling Shares

Through an Institutional Account.  Institutions may sell (redeem) Shares through
their institutional account by contacting their Northern account representative.

     Directly through the Trust. Institutions that purchase Shares directly from
the Trust may redeem  their  Shares  through  the  Transfer  Agent in one of the
following ways:




<PAGE>



     By Mail.
      Send a written request to:
                       Northern Institutional Funds
                       c/o The Northern Trust Company
                       P.O. Box 75943
                       Chicago, Illinois 60675-5943.
      The letter of instruction must include:
                            The  signature  of a  duly  authorized  person  Your
                            account  number The name of the Portfolio The number
                            of Shares or the dollar amount to be redeemed.

     By Telephone.
                Call the Transfer Agent at 1-800-637-1380 for instructions.
                During periods of unusual economic or market activity, telephone
               redemptions  may  be  difficult  to  implement.  In  such  event,
               shareholders  should follow the  procedures  outlined above under
               "Selling Shares By Mail."

     By Wire.
                Call the Transfer Agent at 1-800-637-1380 for instructions.  You
                must have given authorization for expedited wire redemption. The
                minimum amount that may be redeemed by this method is $10,000.


Account Policies and Other Information

Automatic  Investment  Arrangements.  Institutions  may purchase  Shares through
their   institutional   accounts  at  Northern  either  by  directing  automatic
investment  of cash  balances  in excess of certain  agreed  upon  amounts or by
directing  investments from time to time on a non-automatic basis. Northern will
place a purchase order generated under an automatic  investment direction either
on the  Business  Day that  funds are  available  in the  account or on the next
Business Day, depending upon the terms of the automatic investment  arrangement.
Similarly,  Northern will place a redemption  order generated under an automatic
investment  direction  either  on  the  Business  Day  Northern  calculates  the
redemption  amount  needed to bring the  account  balance up to the agreed  upon
amount or on the next  Business Day,  depending  upon the terms of the automatic
investment  arrangement.  If a redemption  order is placed on the next  Business
Day,  Northern  will  normally  provide  funds by  provisionally  crediting  the
Institution's  account on the day the calculation is made.  Institutions  should
contact  Northern  for  more  information   about  their  automatic   investment
arrangements.  Purchase and Redemption Minimums.  There is a minimum initial
investment  of $5  million  in a  Portfolio  and  one or more  other  investment
portfolios  of the  Trust.  This  minimum  does not  apply,  however,  to Shares
purchased  through a  Northern  cash  sweep  program.  There is no  minimum  for
subsequent  investments.  A $10,000 minimum applies for redemptions by wire. The
Trust  reserves  the right to waive  purchase  and  redemption  minimums  and to
determine the manner in which a minimum is satisfied.

Calculating Share Price. The Trust issues Shares and redeems Shares at net asset
value  ("NAV").  The NAV for each share class of a Portfolio  is  calculated  by
dividing  the value of net  assets  attributed  to that  class by the  number of
outstanding  shares  of the  class.  The NAV for  each  Portfolio  and  class is
calculated  as of 3:00 p.m.,  Chicago  time,  each Business Day. The NAV used in
determining the price of your Shares is the one calculated  after your purchase,
exchange or redemption order is received or accepted as described below.

     Each  Portfolio  seeks to maintain an NAV of $1.00 per share by valuing the
obligations  held by it at amortized  cost in accordance  with SEC  regulations.
Amortized cost will normally approximate market value.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 1:00 p.m., Chicago time, on any Business Day will be
executed the same day, provided that either:

                The Transfer  Agent  receives  the purchase  price in Federal or
                other  immediately  available funds prior to 1:00 p.m.,  Chicago
                time,  the  same  Business  Day;  The  order is  accepted  by an
                authorized  intermediary  and payment is to be made by the close
                of the same Business Day in Federal or other immediately
             available funds according to procedures authorized by the Trust; or
                Payment  in  Federal  or other  immediately  available  funds is
               received   by  the  close  of  the  same   Business   Day  in  an
               institutional account maintained with Northern or an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 1:00 p.m.,  Chicago  time,  on a Business Day will be
executed on the next Business Day, provided that payment is made as noted above.
We consider  requests  to be in "good  order" when all  required  documents  are
properly  completed,  signed  and  received,  including  a  certified  corporate
resolution or other acceptable evidence of authority. If an Institution pays for
Shares by check,  Federal  funds  generally  will  become  available  within two
Business Days after a purchase order is received.

If payment is not received as described above from an authorized intermediary on
the same Business Day of acceptance of an order by the authorized  intermediary,
the  authorized  intermediary  may  be  liable  for  fees  and  losses  and  the
transaction may be cancelled.

In  certain  circumstances,  the Trust may  advance  the time by which  purchase
orders must be received. See "Early Closings" on page [ ].

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.

In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment for Shares in the form of securities  that are  permissible  investments
for a  Portfolio.  The Trust also  reserves  the right to pay  redemptions  by a
distribution "in-kind" of securities (instead of cash) from a Portfolio. See the
Statement of Additional  Information for further  information about the terms of
these purchases and redemptions.

Miscellaneous Purchase Information.

      Institutions  are  responsible  for  transmitting  purchase  orders to the
Transfer Agent and delivering required funds on a timely basis.
      Institutions are responsible for all losses and expenses of a Portfolio in
     the  event of any  failure  to make  payment  according  to the  procedures
     outlined in this Prospectus. Northern may redeem shares from any account it
     maintains to protect the Portfolios and Northern against loss. In addition,
     a $20 charge will be imposed if a check does not clear.
      Shares of a  Portfolio  are  entitled  to the  dividends  declared  by the
     Portfolio  beginning on the  Business  Day the purchase  order is executed,
     provided  payment  in  Federal  or  other  immediately  available  funds is
     received by the Transfer Agent by the time designated above.
      The Trust reserves the right to reject any purchase order.  The Trust also
reserves the right to change or discontinue any of its purchase procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
will be effected at the NAV next  determined  after your  exchange or redemption
order is received in good order.  Good order means that the request includes the
following:  the account number and Portfolio name; the amount of the transaction
(as  specified in dollars or shares);  and the  signature  of a duly  authorized
person (except for telephone and wire  redemptions).  See "Account  Policies and
Other Information - Making Changes to Your Account Information."

If either the Transfer  Agent or Northern  (with  respect to your  institutional
account)  receives a redemption order by 1:00 p.m.,  Chicago time, on a Business
Day,  redemption  proceeds  will  normally  be paid in  Federal  funds  or other
immediately  available funds wired or sent by check to you or, if you so choose,
to your institutional account with Northern, on the same Business Day.

Redemption  orders received after 1:00 p.m.,  Chicago time, will be effected the
next Business Day. Proceeds for redemption orders received on a non-Business Day
will normally be sent on the next Business Day after receipt in good order.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page [ ].

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

      The  Trust  reserves  the  right to defer  crediting,  sending  or  wiring
     redemption  proceeds for up to 7 days after receiving the redemption  order
     if, in its judgment, an earlier payment could adversely affect a Portfolio.

      If you are redeeming  recently  purchased Shares,  your redemption request
     may not be honored until your check or electronic  transaction has cleared.
     This may delay your transaction for up to 15 days.

      Institutions  are responsible for  transmitting  redemption  orders to the
     Transfer  Agent and crediting  their  Customers'  accounts with  redemption
     proceeds on a timely basis.

      Redemption  requests  by mail  must be signed  by a person  authorized  by
acceptable documentation on file with the Transfer Agent.

      Dividends on Shares are earned  through and including the day prior to the
day on which they are redeemed.

      The Trust reserves the right to redeem Shares held by any  shareholder who
     provides  incorrect  or  incomplete   account   information  or  when  such
     involuntary  redemptions are necessary to avoid adverse consequences to the
     Trust and its shareholders.

      The Trust may require any information  reasonably necessary to ensure that
a redemption request has been duly authorized.

      The  Trust  reserves  the  right  to  change  or  discontinue  any  of its
redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their account  agreements)  may exchange  Shares of a Portfolio for Shares of
another Portfolio. The registration of both accounts involved must be identical.
A $1,000 minimum investment  applies.  An exchange is a redemption of shares you
own and the  purchase of shares you are  acquiring.  It is  considered a taxable
event and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days written notice to shareholders  and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Advance  Notification  of  Large  Transactions.   The  Trust  requests  that  an
Institution  give advance  notice to the Transfer  Agent by 11:00 a.m.,  Chicago
time,  if it intends to place a purchase  or  redemption  order of $5 million or
more on a Business Day.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

     Business Day. A "Business  Day" is each Monday through Friday when Northern
or the New York Stock  Exchange is open for business.  A "Business Day" does not
include a holiday observed by Northern and the Exchange.  In 2000 these holidays
are: New Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolios  reserve the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  They also reserve this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering funds on a timely basis. A Portfolio will be
deemed to have  received an order when the order is  accepted by the  authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Information  About   Institutions.   Customers   purchasing  Shares  through  an
Institution  should read their account  agreements  carefully.  An Institution's
requirements may differ from those listed in this Prospectus. An Institution may
impose account charges, such as asset allocation fees, account maintenance fees,
and other  charges  that  will  reduce  the net  return  on an  investment  in a
Portfolio.  If a Customer has agreed with a particular Institution to maintain a
minimum  balance with the  Institution and the balance falls below this minimum,
the  Customer  may be  required to redeem all or a part of his  investment  in a
Portfolio.

Northern  may  provide  compensation  to  certain  dealers  and other  financial
intermediaries  who provide  services to their Customers who invest in the Trust
or whose Customers purchase  significant  amounts of Shares of a Portfolio.  The
amount of such compensation may be made on a one-time and/or periodic basis, and
may  represent  all or a  portion  of the  annual  fees  earned by  Northern  as
Investment  Adviser  (after  adjustments).  This  compensation  will  be paid by
Northern or its affiliates  and will not represent an additional  expense to the
Trust or its shareholders.

State  securities  laws  regarding the  registration  of dealers may differ from
Federal law. As a result,  Institutions investing in the Portfolios on behalf of
their Customers may be required to register as dealers.


Distributions and Taxes

Distributions

Dividends  from net income are declared daily and paid monthly by each Portfolio
to its  shareholders.  Net income includes the interest accrued on a Portfolio's
assets less estimated expenses. Each Portfolio's net realized short-term capital
gains, if any, are  distributed at least annually.  The Portfolios do not expect
to realize net long-term capital gains.

Dividends  are  paid as soon as  practicable  following  the end of each  month,
except in the case of a total  redemption  of Shares in an  account  that is not
subject to a standing  order for the  purchase  of  additional  Shares.  In that
event, dividends will be paid promptly along with the redemption proceeds.

[All  distributions are automatically  reinvested  (without any sales charge) in
additional   Shares  of  the  same  Portfolio,   unless  you  elect  to  receive
distributions  in cash by notifying the Transfer Agent in writing.] You may make
arrangements to credit these  distributions  to your account with Northern,  its
affiliates or its correspondent banks.

There are no fees or sales charges on reinvestments.

Taxes

Each Portfolio intends to qualify as a regulated  investment company for Federal
tax  purposes,  and  to  distribute  substantially  all  of its  net  income  to
shareholders  each  year.  Except  for  exempt-interest  dividends  paid  by the
Tax-Exempt  and  Municipal  Portfolios,  dividends  derived  from taxable
interest income and short-term capital gains will be taxable as ordinary income,
and  distributions,  if any,  derived  from net  long-term  capital  gains  will
generally  be  taxable  as   long-term   capital   gains,   unless  you  have  a
tax-advantaged  account.  This is true whether  dividends and  distributions are
received in cash or reinvested in Portfolio Shares.


The Tax-Exempt and  Municipal  Portfolios intend to pay substantially all
of their dividends as "exempt-interest dividends," which are exempt from Federal
income tax.  Shareholders  who are recipients of Social Security Act or Railroad
Retirement Act benefits should note that exempt-interest dividends will be taken
into account in determining the taxability of their benefit payments. If you
receive an  exempt-interest  dividend with respect to any share and the share is
held for six months or less,  any loss on the sale or exchange of the share will
be disallowed  to the extent of the dividend  amount.  Interest on  indebtedness
incurred by a shareholder  to purchase or carry shares of either the  Tax-Exempt
or Municipal  Portfolios generally will not be deductible for federal income tax
purposes.  In certain  instances,  dividends paid by the Tax-Exempt  and
Municipal  Portfolios,  while exempt from regular Federal income tax, may be
subject to the alternative  minimum tax. In addition,  the Tax-Exempt  Portfolio
may invest a portion of its assets in securities  that  generate  income that is
not exempt from Federal tax. Any dividends paid by the Tax-Exempt Portfolio that
are  derived  from  taxable  interest or from  capital  gains will be subject to
Federal income tax.

The  Tax-Exempt  and  Municipal  Portfolios  will each  determine  annually  the
percentages  of its net  investment  income  which are exempt  from the  regular
Federal income tax,  which  constitute an item of tax preference for purposes of
the Federal alternative minimum tax, and which are fully taxable. The Tax-Exempt
and  Municipal  Portfolios  will  apply  these  percentages   uniformly  to  all
distributions declared from net investment income during that year.

Except as stated below, you may be subject to state and local taxes on Portfolio
distributions and redemptions. State income taxes may not apply, however, to the
portions  of a  Portfolio's  distributions,  if any,  that are  attributable  to
interest on certain types of Federal securities or interest on securities issued
by the particular state or municipalities within the state.

Other Tax Information

Dividends and distributions  from each Portfolio will generally be reportable by
you in the tax year in which  they are paid with one  exception.  Dividends  and
distributions declared by a Portfolio in October,  November or December and paid
in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.

Your investment in the Portfolios  could have additional tax  consequences.
Shareholders who are nonresident  aliens,  foreign trusts or estates, or foreign
corporations or partnerships,  may be subject to different United States Federal
income  tax   treatment.  You  should  consult  your  tax  professional  for
information regarding all the tax consequences applicable to your investments in
the  Portfolios.  More  information  is provided in the  Statement of Additional
Information.  This short summary is not intended as a substitute for careful tax
planning.


In  particular,  although  the  Government  Select  Portfolio  intends to invest
primarily  in U.S.  government  securities,  the  interest on which is generally
exempt from state income taxation,  you should consult your own tax professional
to determine  whether this is true in your own situation.  Similarly,  dividends
paid  by  the  Portfolios   (including  the  Tax-Exempt   and   Municipal
Portfolios)  may be taxable  under  state or local law as  dividend  income even
though  all or a portion  of such  dividends  may be derived  from  interest  on
obligations which, if realized directly, would be exempt from such income taxes.


                                YEAR 2000 ISSUES

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 arrives, many systems may be unable to
accurately process certain date-based  information,  which could cause a variety
of operational problems for businesses. This could have a negative effect on the
companies  in  which  the  Portfolios  invest,   thus  hurting  the  Portfolios'
investment returns.

Northern Trust has implemented  steps to prepare its mission  critical  computer
systems and processes for Year 2000  processing.  It has established a dedicated
Year 2000 Project Team whose members have  significant  systems  development and
maintenance   experience.   Northern   Trust's  Year  2000  project  included  a
comprehensive  testing plan of its mission critical systems.  Northern Trust has
advised the Trust that it has completed work on its mission critical systems and
testing with significant outside parties.

Northern  Trust  instituted a program to monitor and assess the efforts of other
parties,  such as other service providers to the Portfolio.  However,  it cannot
control the success of those other parties' efforts. Contingency plans have been
established where believed necessary to provide Northern Trust with alternatives
in case these entities experience significant Year 2000 difficulties that impact
Northern Trust.

Furthermore,  even if the actions taken by Northern  Trust are  successful,  the
normal   operations  of  the  Portfolios   may,  in  any  event,   be  disrupted
significantly  by the failure of  communications  and public utility  companies,
governmental entities,  financial processors or others to perform their services
as a result of Year 2000 problems.  Efforts in foreign countries to remediate
potential Year 2000 problems are not as extensive as those in the United States.
As a result,  the  operations of foreign  markets,  foreign  issuers and foreign
governments  may be  disrupted  by the  Year  2000  problem  and the  investment
portfolio of a Portfolio may be adversely affected.



                        RISKS, SECURITIES AND TECHNIQUES


This section takes a closer look at some of the types of securities in which the
Portfolios  may invest and their  related  risks.  It also  explores the various
investment  techniques  that the  investment  management  team  may,  but is not
required to, use. The Portfolios may invest in other  securities and are subject
to further  restrictions  and risks  which are  described  in the  Statement  of
Additional Information.

Asset-Backed Securities.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  Asset-backed securities represent  participations in, or are secured
by  and  payable  from,  pools  of  assets  such  as  mortgages,  motor  vehicle
installment sale contracts,  installment loan contracts, leases of various types
of real and personal  property,  receivables from revolving credit (credit card)
agreements and other financial assets.  Such asset pools are securitized through
the use of privately-formed trusts or special purpose corporations.  Payments or
distributions  of principal and interest may be guaranteed up to certain amounts
and for a certain time period by a letter of credit or a pooled insurance policy
issued by a financial institution, or other credit enhancements.


         Investment  strategy.  The  Diversified  Assets  Portfolio,  Tax-Exempt
         Portfolio and Municipal  Portfolio may purchase various types of
         asset-backed securities that are "Eligible Securities" as defined by
         the SEC. The Government Portfolio may only purchase mortgage-backed
         securities that are guaranteed by the U.S. government,  its agencies or
         instrumentalities.


         Special  risks.  In  addition to credit and market  risk,  asset-backed
         securities  involve  prepayment  risk  because  the  underlying  assets
         (loans) may be prepaid at any time.  The value of these  securities may
         also   change   because   of  actual  or   perceived   changes  in  the
         creditworthiness of the originator,  the servicing agent, the financial
         institution  providing the credit support,  or the  counterparty.  Like
         other fixed income  securities,  when interest rates rise, the value of
         an asset-backed security generally will decline. However, when interest
         rates decline,  the value of an  asset-backed  security with prepayment
         features  may not  increase  as much as  that  of  other  fixed  income
         securities.  In addition,  non-mortgage asset-backed securities involve
         certain risks not presented by mortgage-backed  securities.  Primarily,
         these securities may not have the benefit of the same security interest
         in the underlying  collateral.  Credit card  receivables  are generally
         unsecured,  and the debtors are entitled to the  protection of a number
         of state and Federal consumer credit laws.  Automobile  receivables are
         subject to the risk that the trustee for the holders of the  automobile
         receivables may not have an effective  security  interest in all of the
         obligations backing the receivables.


Borrowings and Reverse  Repurchase  Agreements.  The Portfolios may borrow money
from banks and the  Government  Select,  Government,  Diversified  Assets and
Municipal Portfolios may enter into reverse repurchase agreements with banks
and other financial institutions. Reverse repurchase agreements involve the sale
of money  market  securities  held by a  Portfolio  subject  to the  Portfolio's
agreement to repurchase them at a mutually agreed upon date and price (including
interest).

         Investment strategy. Each Portfolio may borrow in amounts not exceeding
         one-third  of  its  total  assets.   Each  of  the  Government  Select,
         Government,  Diversified  Assets and  Municipal  Portfolios  may
         enter into  reverse  repurchase  agreements  in amounts  not  exceeding
         one-third of its total assets  (including the amount  borrowed).
         These  transactions  may be entered  into as a  temporary  measure  for
         emergency purposes or to meet redemption  requests.  Reverse repurchase
         agreements may also be entered into when the investment management team
         expects that the interest  income to be earned from the  investment  of
         the  transaction  proceeds  will be greater  than the related  interest
         expense.

         Special risks.  Borrowings and reverse  repurchase  agreements  involve
         leveraging.  If the securities held by the Portfolios  decline in value
         while these  transactions are  outstanding,  the net asset value of the
         Portfolios' outstanding shares will decline in value by proportionately
         more than the decline in value of the securities. In addition,  reverse
         repurchase agreements involve the risks that the interest income earned
         by a Portfolio  (from the investment of the proceeds) will be less than
         the interest expense of the  transaction,  that the market value of the
         securities  sold by a  Portfolio  will  decline  below  the  price  the
         Portfolio is obligated to pay to repurchase  the  securities,  and that
         the securities may not be returned to the Portfolio.

Custodial   Receipts   for   Treasury   Securities.   Custodial   receipts   are
participations in trusts that hold U.S.  Treasury  securities and are sold under
names such as TIGRs and CATS. Like other stripped obligations,  they entitle the
holder to future interest or principal payments on the U.S. Treasury securities.

         Investment strategy. The Government,  Diversified Assets and Tax-Exempt
         Portfolios  may  purchase  custodial   receipts.   Investments  by  the
         Government  Portfolio in custodial  receipts will not exceed 35% of the
         value of its total assets.

         Special risks. Like other stripped obligations,  custodial receipts may
         be subject to greater price  volatility than ordinary debt  obligations
         because of the way in which their  principal  and interest are returned
         to investors.

Derivatives.  Each Portfolio may purchase certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from---or  based
upon---the  performance  of  underlying  assets,  interest or currency  exchange
rates,  or indices.  Derivatives  include  structured debt  obligations  such as
collateralized mortgage obligations and other types of asset-backed  securities,
"stripped" securities and various floating rate instruments.

             Investment strategy. A Portfolio will invest in derivatives only if
             the potential risks and rewards are consistent with the Portfolio's
             objective, strategies and overall risk profile.

             Special risks. Engaging in derivative transactions involves special
             risks,  including (a) market risk that the Portfolio's  derivatives
             position will lose value;  (b) credit risk that the counterparty to
             the transaction will default; (c) leveraging risk that the value of
             the derivative  instrument  will decline more than the value of the
             assets on which it is based;  (d) illiquidity risk that a Portfolio
             will be unable to sell its position because of lack of market depth
             or  disruption;  (e)  pricing  risk that the value of a  derivative
             instrument will be difficult to determine;  and (f) operations risk
             that loss will  occur as a result of  inadequate  systems  or human
             error.  Many types of derivatives have been recently  developed and
             have not  been  tested  over  complete  market  cycles.  For  these
             reasons,  a Portfolio may suffer a loss whether or not the analysis
             of the investment management team is accurate.

Diversification. Diversifying its holdings can help a Portfolio reduce the risks
of investing.  In accordance with current SEC  regulations,  each Portfolio will
not invest more than 5% of the value of its total assets at the time of purchase
in the  securities of any single issuer.  However,  a Portfolio may invest up to
25% of the value of its total assets in the securities of a single issuer for up
to three  Business  Days.  These  limitations  do not  apply  to  cash,  certain
repurchase  agreements,  U.S.  government  securities  or  securities  of  other
investment companies.  In addition,  securities subject to certain unconditional
guarantees and securities that are not "First Tier Securities" as defined by the
SEC are subject to different  diversification  requirements  as described in the
Statement of Additional Information.

Downgraded Securities.  After its purchase, a portfolio security may be assigned
a lower rating or cease to be rated. If this occurs, a Portfolio may continue to
hold the issue if the Investment  Adviser believes it is in the best interest of
the Portfolio and its shareholders.

Foreign  Securities.   The  Diversified  Assets  Portfolio  may  invest  in  the
obligations  of foreign  governments,  or any of their  political  subdivisions,
agencies or instrumentalities,  foreign commercial banks and foreign branches of
U.S. banks. It may also invest in U.S.  dollar-denominated  commercial paper and
other obligations of foreign issuers. Foreign government obligations may include
debt   obligations   of   supranational   entities,    including   international
organizations   (such  as  the  European  Coal  and  Steel   Community  and  the
International  Bank for  Reconstruction and Development (also known as the World
Bank)) and international banking institutions and related government agencies.

         Investment strategy. Investments by the Diversified Assets Portfolio in
         foreign issuer obligations will not exceed 50% of the Portfolio's total
         assets measured at the time of purchase.

         Special  risks.  Foreign  securities  involve  special risks and costs.
         Foreign  securities,  and in particular  foreign debt  securities,  are
         sensitive to changes in interest rates. In addition,  investment in the
         securities  of  foreign  governments  involves  the risk  that  foreign
         governments  may  default on their  obligations  or may  otherwise  not
         respect the integrity of their debt.

         Investment  in  foreign   securities  may  involve  higher  costs  than
         investment in U.S. securities, including higher transaction and custody
         costs  as  well  as the  imposition  of  additional  taxes  by  foreign
         governments. Foreign investments may also involve risks associated with
         less  complete  financial  information  about the issuers,  less market
         liquidity,  more market  volatility and political  instability.  Future
         political  and  economic  developments,   the  possible  imposition  of
         withholding   taxes   on   dividend   income,   possible   seizure   or
         nationalization   of  foreign   holdings  or  the   adoption  of  other
         governmental  restrictions  might  adversely  affect an  investment  in
         foreign securities. Additionally, foreign banks and foreign branches of
         domestic banks may be subject to less stringent  reserve  requirements,
         and to different accounting, auditing and recordkeeping requirements.

Illiquid  or  Restricted  Securities.  Illiquid  securities  include  repurchase
agreements  and time deposits with  notice/termination  dates of more than seven
days,  certain  variable amount master demand notes that cannot be called within
seven  days,  certain  insurance  funding  agreements  (see  below),  and  other
securities  that are traded in the U.S. but are subject to trading  restrictions
because they are not  registered  under the  Securities  Act of 1933, as amended
(the "1933 Act").

         Investment  strategy.  Each  Portfolio  may invest up to 10% of its net
         assets in securities that are illiquid.  A domestically traded security
         which is not  registered  under  the  1933  Act will not be  considered
         illiquid if the Investment  Adviser determines that an adequate trading
         market exists for that  security.  If otherwise  consistent  with their
         investment  objectives  and  policies,   the  Portfolios  may  purchase
         commercial  paper  issued  pursuant to Section 4(2) of the 1933 Act and
         securities  that are not registered  under the 1933 Act but can be sold
         to "qualified  institutional buyers" in accordance with Rule 144A under
         the 1933 Act. These securities will not be considered  illiquid so long
         as Northern determines,  under guidelines approved by the Trust's Board
         of Trustees, that an adequate trading market exists.

         Special  risks.  Because  illiquid  and  restricted  securities  may be
         difficult  to sell at an  acceptable  price,  they  may be  subject  to
         greater  volatility  and  may  result  in a loss  to a  Portfolio.  The
         practice of  investing in Rule 144A  Securities  and  commercial  paper
         available to qualified institutional buyers could increase the level of
         illiquidity  during  any period  that  qualified  institutional  buyers
         become uninterested in purchasing these securities.

Insurance  Funding  Agreements.  An insurance  funding  agreement  ("IFA") is an
agreement that requires a Portfolio to make cash contributions to a deposit fund
of an insurance  company's  general account.  The insurance company then credits
interest to the Portfolio for a set time period.

         Investment  strategy.  The Diversified  Assets  Portfolio may invest in
         IFAs  issued by  insurance  companies  that  meet  quality  and  credit
         standards established by the Investment Adviser.

         Special risks.  IFAs are not insured by a government  agency--they  are
         backed only by the  insurance  company that issues  them.  As a result,
         they are subject to default  risk.  In  addition,  an active  secondary
         market in IFAs does not  currently  exist.  This  means  that it may be
         difficult to sell an IFA at an appropriate price.

Investment  Companies.  In  connection  with the  management of their daily cash
positions, the Portfolios may invest in shares of other money market funds which
invest in short-term,  high quality debt  securities  and  securities  issued by
other  investment  companies  consistent  with their  investment  objectives and
policies.

             Investment  strategy.  Investments  by a  Portfolio  in other money
             market funds will be subject to the  limitations  of the Investment
             Company Act of 1940.  [Although the  Portfolios do not expect to do
             so in the  foreseeable  future,  each  Portfolio is  authorized  to
             invest  substantially  all of its assets in an open-end  investment
             company  that  has the  same  investment  objective,  policies  and
             fundamental restrictions as the Portfolio.]

             Special risks. As a shareholder of another  investment  company,  a
             Portfolio  would be subject to the same risks as any other investor
             in that company.  It would also bear a  proportionate  share of any
             fees or expenses paid by that company.  These  expenses would be in
             addition to the  advisory  fees and other  expenses  the  Portfolio
             bears directly in connection with its own operations.

Municipal  and  Related   Instruments.   Municipal   instruments   include  debt
obligations issued by or on behalf of states, territories and possessions of the
United  States  and their  political  subdivisions,  agencies,  authorities  and
instrumentalities.

Municipal  instruments  include both  "general" and  "revenue"  bonds and may be
issued to obtain funds for various  public  purposes.  General  obligations  are
secured by the  issuer's  pledge of its full  faith,  credit  and taxing  power.
Revenue obligations are payable only from the revenues derived from a particular
facility or class of facilities.  In some cases,  revenue bonds are also payable
from the proceeds of a special excise or other  specific  revenue source such as
lease  payments from the user of a facility being  financed.  Some municipal
instruments, known as private activity bonds, are issued to finance projects for
private companies.  Private activity bonds are usually revenue obligations since
they are typically payable by the private user of the facilities financed by the
bonds.  Municipal  instruments  also include "moral  obligation"  bonds,
municipal leases,  certificates of participation and custodial  receipts.  Moral
obligation  bonds are supported by a moral commitment but not a legal obligation
of a state or  municipality.  Municipal  leases and  participation  certificates
present the risk that the state or  municipality  involved will not  appropriate
the monies to meet  scheduled  payments on an annual basis.  Custodial  receipts
represent interests in municipal instruments held by a trustee.

During extraordinary  circumstances,  the Tax-Exempt Portfolio may invest in AMT
obligations  such as certain  bonds  issued to obtain  funds to provide  certain
water, sewage and solid waste facilities, qualified residential rental projects,
certain local electric,  gas and other heating or cooling facilities,  qualified
hazardous waste facilities, and government-owned airports, docks and wharves and
mass  commuting  facilities;   certain  qualified  mortgage,  student  loan  and
redevelopment  bonds;  and certain  bonds  issued as part of "small  issues" for
industrial facilities.

The  Municipal  Portfolio  may acquire  "stand-by  commitments"  relating to the
municipal instruments it holds. Under a stand-by commitment,  a dealer agrees to
purchase,  at the  Portfolio's  option,  specified  municipal  instruments  at a
specified price. A stand-by commitment may increase the cost, and thereby reduce
the yield,  of the municipal  instruments to which the commitment  relates.  The
Municipal  Portfolio  will acquire  stand-by  commitments  solely to  facilitate
portfolio  liquidity  and does not intend to exercise  their  rights for trading
purposes.

             Investment  strategy.  [Although it is not each Portfolio's current
             policy  to  do so on a  regular  basis,]  in  connection  with  its
             investments in municipal instruments,  the Tax-Exempt and Municipal
             Portfolios  may each  invest  more than 25% of its total  assets in
             municipal  instruments  the interest upon which is paid solely from
             revenues of similar  projects.  The  Tax-Exempt  Portfolio may also
             invest more than 25% of its total assets in industrial  development
             obligations or municipal  instruments whose issuers are in the same
             state. However, neither the Tax-Exempt nor the Municipal Portfolios
             intends to invest more than 25% of the value of its total assets in
             industrial  development  bonds or  similar  obligations  where  the
             non-governmental  entities supplying the revenues to be paid are in
             the same industry.

             The  Diversified  Assets  Portfolio  may invest up to 5% of its net
             assets in municipal instruments or other securities issued by state
             and local governmental bodies.  Generally, this will occur when the
             yield of municipal  instruments,  on a pre-tax basis, is comparable
             to  that  of  other  permitted   short-term  taxable   investments.
             Dividends  paid  by  the  Diversified   Assets  Portfolio  on  such
             investments will be taxable to shareholders.

         Special risks.  Municipal  instruments  purchased by the Tax-Exempt and
         Municipal  Portfolios may be backed by letters of credit,  insurance or
         other  forms  of  credit  enhancement  issued  by  foreign  (as well as
         domestic) banks, insurance companies and other financial  institutions.
         If the  credit  quality  of  these  banks  and  financial  institutions
         declines,  a  Portfolio  could  suffer  a loss to the  extent  that the
         Portfolio is relying upon this credit support. Foreign institutions can
         present special risks relating to higher transaction and custody costs,
         the  imposition  of  additional  taxes  by  foreign  governments,  less
         complete  financial  information,  less market  liquidity,  more market
         volatility  and  political   instability.   Foreign  banks,   insurance
         companies and financial  institutions  may be subject to less stringent
         reserve  requirements,  and  to  different  accounting,   auditing  and
         recordkeeping requirements than U.S banks.

         In  addition,  when a substantial  portion of a  Portfolio's  assets is
             invested  in  instruments  which  are  used to  finance  facilities
             involving  a  particular  industry,  whose  issuers are in the same
             state or which are otherwise  related,  there is a possibility that
             an  economic,  business  or  political  development  affecting  one
             instrument would likewise affect the related instrument.

Repurchase Agreements.  Repurchase agreements involve the purchase of securities
by a  Portfolio  subject  to the  seller's  agreement  to  repurchase  them at a
mutually agreed upon date and price.

         Investment   strategy.   Each  Portfolio  may  enter  into   repurchase
         agreements with financial institutions such as banks and broker-dealers
         that are deemed to be creditworthy by the Investment Adviser.  Although
         the securities  subject to a repurchase  agreement may have  maturities
         exceeding one year,  settlement of the agreement  will never occur more
         than one year after a Portfolio acquires the securities.

         Special  risks.  In the event of a default,  a Portfolio  will suffer a
         loss to the extent that the  proceeds  from the sale of the  underlying
         securities and other  collateral are less than the repurchase price and
         the  Portfolio's  costs  associated  with delay and  enforcement of the
         repurchase  agreement.  In  addition,  in the  event of  bankruptcy,  a
         Portfolio   could  suffer  losses  if  a  court   determines  that  the
         Portfolio's interest in the collateral is not enforceable.

Securities  Lending.  In order to generate additional income, the Portfolios may
lend  securities  on a short-term  basis to banks,  brokers and dealers or other
qualified  institutions.  In exchange,  the Portfolios  will receive  collateral
equal to at least 100% of the value of the securities loaned.

         Investment  strategy.  Securities  lending may  represent  no more than
         one-third the value of a Portfolio's  total assets  (including the loan
         collateral).  Any cash collateral received by a Portfolio in connection
         with these  loans may be  invested in U.S.  government  securities  and
         other liquid high-grade debt obligations.

         Special risks. The main risk when lending portfolio  securities is that
         the borrower  might become  insolvent or refuse to honor its obligation
         to return the securities.  In this event, a Portfolio could  experience
         delays in recovering  its  securities  and may possibly incur a capital
         loss. In addition, a Portfolio may incur a loss in reinvesting the cash
         collateral it receives.

     Stripped  Obligations.  These securities are issued by the U.S.  government
(or agency or instrumentality), foreign governments or banks and other financial
institutions.  They entitle the holder to receive  either  interest  payments or
principal  payments  that have been  "stripped"  from a debt  obligation.  These
obligations include stripped  mortgage-backed  securities,  which are derivative
multi-class mortgage securities.

     Investment   strategy.   Each  of  the  Portfolios  may  purchase  stripped
securities.

         Special risks.  Stripped securities are very sensitive to interest rate
         changes and to the rate of principal prepayments. A rapid or unexpected
         increase in mortgage  prepayments  could severely  depress the price of
         certain  stripped  mortgage-backed  securities and adversely affect the
         Portfolios' total returns.

United States Government  Obligations.  These include U.S. Treasury obligations,
such as bills,  notes and bonds,  which generally  differ only in terms of their
interest rates, maturities and time of issuance.  These also include obligations
issued   or   guaranteed   by  the  U.S.   government   or  its   agencies   and
instrumentalities.  Securities  guaranteed  as to principal  and interest by the
U.S.  government,  its agencies or  instrumentalities  are deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of  credit  issued  by the U.S.  government  or an agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         Investment  strategy.  To the  extent  consistent  with its  investment
         objective,  each  Portfolio  may invest in a variety  of U.S.  Treasury
         obligations and obligations issued or guaranteed by the U.S. government
         or its agencies and instrumentalities.

         Special  risks.  Not all U.S.  government  obligations  carry  the same
         guarantees.  Some,  such as those of the Government  National  Mortgage
         Association ("GNMA"), are supported by the full faith and credit of the
         United States Treasury. Other obligations, such as those of the Federal
         Home Loan  Banks,  are  supported  by the right of the issuer to borrow
         from the United States  Treasury;  and others,  such as those issued by
         the Federal National Mortgage  Association  ("FNMA"),  are supported by
         the  discretionary  authority  of the U.S.  government  to purchase the
         agency's obligations.  Still others are supported only by the credit of
         the instrumentality. No assurance can be given that the U.S. government
         would provide financial support to its agencies or instrumentalities if
         it is not obligated to do so by law.  There is no assurance  that these
         commitments  will be  undertaken  or complied  with in the  future.  In
         addition, the secondary market for certain participations in loans made
         to foreign governments or their agencies may be limited.

     Taxable  Investments.  Taxable investments include U.S.  dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and related  custodial  receipts;  and repurchase  agreements
relating to the above instruments.

         Investment  strategy.  The Tax-Exempt and Municipal Portfolios may each
         invest  from  time to  time,  on a  temporary  basis  or for  temporary
         defensive   purposes,   in  short-term  taxable  instruments  that  are
         "Eligible Securities" as defined by the SEC for money market funds.

         Special   risks.   Dividends  paid  by  the  Tax-Exempt  and  Municipal
         Portfolios  that are derived from interest paid on taxable  investments
         will generally be taxable to each Portfolio's  shareholders as ordinary
         income for Federal  income tax purposes.  The  Tax-Exempt and Municipal
         Portfolios  each may not  achieve  its  investment  objective  when its
         assets are invested in taxable obligations.

Variable and Floating Rate  Instruments.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at a margin  above a  generally  recognized  index  rate.  These
instruments  include  long-term  variable  and  floating  rate bonds  (sometimes
referred to as "Put  Bonds")  where a Portfolio  obtains at the time of purchase
the  right  to put the  bond  back to the  issuer  or a third  party at par at a
specified date.

             Investment strategy. Each Portfolio may invest in rated and unrated
             variable and floating  rate  instruments  to the extent  consistent
             with its investment objective. Unrated instruments may be purchased
             by a Portfolio if they are determined by the Investment  Adviser to
             be of comparable quality to rated instruments eligible for purchase
             by the  Portfolio.  The  Portfolios  may invest in variable  amount
             master demand notes.

             Special risks.  Variable and floating rate  instruments are subject
             to  the  same  risks  as  fixed  income  investments,  particularly
             interest rate and credit risk. Because there is no active secondary
             market for certain variable and floating rate instruments, they may
             be more  difficult  to sell if the issuer  defaults  on its payment
             obligations  or during periods when the Portfolios are not entitled
             to exercise their demand rights. As a result,  the Portfolios could
             suffer a loss with respect to these instruments.

When-Issued Securities, Delayed Delivery Transactions and Forward Commitments. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

         Investment strategy.  Each Portfolio may purchase or sell securities on
         a when-issued,  delayed delivery or forward commitment basis.  Although
         the   Portfolios   would   generally   purchase   securities  in  these
         transactions  with the  intention  of  acquiring  the  securities,  the
         Portfolios  may dispose of such  securities  prior to settlement if the
         investment management team deems it appropriate to do so.

         Special risks. Purchasing securities on a when-issued, delayed delivery
         or forward  commitment  basis involves the risk that the securities may
         decrease in value by the time they are  actually  issued or  delivered.
         Conversely,  selling securities in these transactions involves the risk
         that the value of the securities may increase  before the time they are
         actually issued or delivered.  These transactions also involve the risk
         that  the  seller  may  fail to  deliver  the  security  or cash on the
         settlement date.



<PAGE>


40

                                    APPENDIX


                         PORTFOLIO FINANCIAL HIGHLIGHTS

The  financial   highlights  tables  are  intended  to  help  you  understand  a
Portfolio's  financial  performance for the past five years (or, if shorter, the
period of the Portfolio's  operations).  Certain information  reflects financial
results for a single  Portfolio Share. The total returns in the tables represent
the rate  that an  investor  would  have  earned or lost on an  investment  in a
Portfolio  (assuming  reinvestment  of all  dividends and  distributions).  This
information has been audited by [ ], whose report is included in the Portfolios'
annual report along with the Portfolios' financial statements. The annual report
and  semiannual  report are  available  upon request and without  charge.  As of
November 30, 1999, shares of the Municipal  Portfolio had not been issued to the
public.

Financial Highlights




<PAGE>


22




For More Information

Annual/Semiannual Report

Additional  information  about the  Portfolios'  investments is available in the
Portfolios' annual and semiannual reports to shareholders.

Statement of Additional Information

Additional information about the Portfolios and their policies is also available
in the  Portfolios'  Statement of  Additional  Information  ("SAI").  The SAI is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The  Portfolios'  annual and  semiannual  reports and the SAI are available free
upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:
By telephone - Call 1-800-637-1380
By mail - Northern Institutional Funds
                P.O. Box 75943
                Chicago, IL  60675
On the Internet - Text-only versions of the Portfolios'  documents are available
on the SEC's website at http://www.sec.gov

You may review and obtain copies of Trust documents by visiting the SEC's Public
Reference Room in Washington, D.C. You may also obtain copies of Trust documents
by sending your  request and a  duplicating  fee to the SEC's  Public  Reference
Section,   Washington,   D.C.   20549-0102   or   by   electronic   request   at
[email protected].  Information  on the operation of the Public  Reference Room
may be obtained by calling the SEC at 1-202-942-8090.



                                     [LOGO]

                                    811-3605



<PAGE>







Northern Institutional Funds
Money Market Portfolios
Service Shares

      Government Select Portfolio
      Government Portfolio
      Diversified Assets Portfolio
      Tax-Exempt Portfolio
      Municipal Portfolio


Prospectus dated April 1, 2000






An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.

The  Securities and Exchange  Commission  has not approved or disapproved  these
securities or passed upon the adequacy of this Prospectus. Any representation to
the contrary is a criminal offense.






<PAGE>



Contents

<TABLE>
<CAPTION>
<S><C>                                                <C>                                                       <C>
                                                                                                                Page
- ------------------------------------------------------ ------------------------------------------------------------------
Risk/Return Summary                                    Portfolios
Information about the objectives, principal            o    Government Select Portfolio                           X
strategies and risk characteristics of each Portfolio  o    Government Portfolio                                  X
                                                       o    Diversified Assets Portfolio                          X
                                                       o    Tax-Exempt Portfolio                                  X
                                                       o    Municipal Portfolio                                   X



                                                       Principal Investment Strategies and Risks                   X

                                                       Portfolio Performance                                       X
                                                       o    Government Select Portfolio                             X
                                                       o    Government Portfolio                                    X
                                                       o    Diversified Assets Portfolio                            X
Management of the Portfolios                           o    Tax-Exempt Portfolio                                   X
Details that apply to the Portfolios as a group        o    Municipal Portfolio                                    X



                                                       Portfolio Fees and Expenses                                    X

                                                       Investment Adviser                                             X
                                                       Advisory Fees
                                                                                                                    X
                                                       Portfolio Management                                           X
                                                       Other Portfolio Services                                      X

About Your Account                                     Purchasing and Selling Service Shares                         X
How to open, maintain and close an account             o    Investors                                                 X
                                                       o    Share Classes                                            X
                                                       o    Opening an Account                                      X
                                                       o    Selling Service Shares                                  X

                                                       Account Policies and Other Information                       X
                                                       o    Automatic Investment Arrangements                       X
                                                       o    Purchase and Redemption Minimums                        X
                                                       o    Calculating Share Price                                 X
                                                       o    Timing of Purchase Requests                             X
                                                       o    Tax Identification Number                               X
                                                       o    In-Kind Purchases and Redemptions                       X
                                                       o    Miscellaneous Purchase Information                      X
                                                       o    Timing of Redemption and Exchange Requests              X
                                                       o    Miscellaneous Redemption Information                    X
                                                       o    Exchange Privileges                                     X
                                                       o    Telephone Transactions                                  X
                                                       o    Advance Notification of Large Transactions              X
                                                       o    Making Changes to Your Account Information              X
                                                       o    Business Day                                            X
                                                       o    Early Closings                                          X
                                                       o    Authorized Intermediaries                               X
                                                       o    Servicing Agents                                        X


                                                       Distributions and Taxes                                      X
                                                       o    Distributions                                            X
                                                       o    Taxes                                                    X
                                                       o    Other Tax Information                                   X

                                                       Year 2000
                                                            Issues                                                  X

Risks, Securities and Techniques                       Risks, Securities and
                                                       Techniques                                                       X

Appendix                                               Portfolio Financial Highlights                               X

For More Information                                   Annual/Semiannual Reports                                    X
                                                       Statement of Additional Information                          X
- ------------------------------------------------------ ------------------------------------------------------------------

</TABLE>




<PAGE>



Northern  Institutional  Funds (the  "Trust")  offers  five  money market
portfolios  (each a "Portfolio") to institutional  investors.  Each Portfolio is
authorized to offer three classes of shares:  Shares, Service Shares and Premier
Shares. Shares and Premier Shares are described in separate prospectuses.


The  descriptions  on the following pages may help you choose the Portfolio that
best fits your investment  needs. Keep in mind,  however,  that no Portfolio can
guarantee  it will meet its  investment  objective  and no  Portfolio  should be
relied upon as a complete investment program.  The Trust's six fixed income, one
balanced  and  nine   equity  portfolios  are  described  in  a  separate
prospectus.

     The  Portfolios  seek to  maintain  a stable  net asset  value of $1.00 per
share. Consistent with this policy, each of the Portfolios:

     Limits its  dollar-weighted  average portfolio maturity to 90 days or less;
Buys  securities  with  remaining  maturities  of 397 days or less  (except  for
certain  variable and floating rate  instruments and securities  collateralizing
repurchase agreements);  and Invests only in U.S. dollar-denominated  securities
that represent minimal credit risks.

In addition,  each Portfolio limits its investments to "Eligible  Securities" as
defined by the Securities and Exchange Commission  ("SEC").  Eligible Securities
include,  generally,  securities that either (a) have short-term debt ratings at
the time of purchase in the two highest  rating  categories or (b) are issued or
guaranteed by, or otherwise  allow a Portfolio to demand payment from, an issuer
with those ratings. Securities that are unrated (including securities of issuers
that have  long-term  but not  short-term  ratings) may be deemed to be Eligible
Securities  if  determined  to be of  comparable  quality by The Northern  Trust
Company under the direction of the Board of Trustees. Securities that are in the
highest  short-term  rating  category (and  comparable  unrated  securities) are
called  "First Tier  Securities."  Under normal  circumstances,  the  Government
Select,  Government and Diversified  Assets Portfolios intend to limit purchases
of securities to First Tier  Securities.  Securities in which the Portfolios may
invest  may not earn as high a level of income  as  long-term  or lower  quality
securities,  which  generally have greater  market risk and more  fluctuation in
market value.

In addition to the  instruments  described  above and on the pages  below,  each
Portfolio  may use  various  investment  techniques  in seeking  its  investment
objective.  You can learn more  about  these  techniques  and  related  risks by
reading  "Risks,  Securities  and  Techniques"  beginning  on page  [XX] of this
Prospectus and the Statement of Additional Information.




<PAGE>


Government Select Portfolio

Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.


Principal Investment Strategies and Risks

Investment Strategies
The Portfolio seeks its objective by investing  exclusively in securities issued
or guaranteed as to principal and interest by the U.S. government,  its agencies
or instrumentalities. Under normal market conditions, the Portfolio will seek to
acquire  only  those  U.S.  government  securities  the  interest  upon which is
generally   exempt  from  state  income  taxation.   These  securities   include
obligations issued by the U.S. Treasury and certain U.S. government agencies and
instrumentalities,  such as the  Federal  Home  Loan Bank and the  Federal  Farm
Credit Banks Funding Corp.

When  appropriate  securities which are exempt from state taxes are unavailable,
the Portfolio may also invest in non-exempt U.S. government  securities and cash
equivalents  including  money market funds and time  deposits with a maturity of
three months or less, and hold uninvested cash.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk, prepayment (or call) risk, debt extension risk, Government securities
risk,  guarantor (or credit enhancement) risk,  management risk, liquidity risk,
and Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.




<PAGE>



Government Portfolio


Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.


Principal Investment Strategies and Risks

Investment Strategies

The  Government  Portfolio  seeks its  objective  by  investing  exclusively  in
marketable  securities  issued or guaranteed as to principal and interest by the
U.S. government,  its agencies or  instrumentalities,  and repurchase agreements
backed  by such  securities.  The  Portfolio  may also hold  custodial  receipts
representing  interests in U.S. government  securities.   Risks These primary
investment  risks apply to the Portfolio:  stable NAV risk,  interest rate risk,
prepayment (or call) risk,  debt extension  risk,  Government  securities  risk,
guarantor (or credit  enhancement)  risk,  management risk,  liquidity risk, and
Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.




<PAGE>



Diversified Assets Portfolio

Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.

Principal Investment Strategies and Risks

     Investment  Strategies The Diversified Assets Portfolio seeks its objective
by investing in a broad range of  government,  bank and  commercial  obligations
that are available in the money markets, including:

     U.S.  dollar-denominated  obligations  of U.S.  banks with total  assets in
excess of $1 billion (including obligations of foreign branches of such banks);

     U.S. dollar-denominated  obligations of foreign commercial banks where such
banks have total assets in excess of $5 billion;

     High quality commercial paper and other obligations issued or guaranteed by
U.S. and foreign corporations and other issuers;

     Corporate  bonds,  notes,  paper  and  other  instruments  that are of high
quality;

          Asset-backed securities;

     Securities  issued or  guaranteed  as to principal and interest by the U.S.
government or by its agencies or  instrumentalities  and custodial receipts with
respect thereto;

     U.S.  dollar-denominated  securities  issued or  guaranteed  by one or more
foreign governments or political subdivisions, agencies or instrumentalities;

          Repurchase agreements relating to the above instruments; and

     Municipal  securities  issued or guaranteed by state or local  governmental
bodies.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk,  credit (or default) risk,  guarantor (or credit  enhancement)  risk,
management risk, liquidity risk,  prepayment (or call) risk, debt extension risk
and Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.






<PAGE>



Tax-Exempt Portfolio

Investment Objective

The Portfolio seeks to provide its  shareholders,  to the extent consistent with
the  preservation  of capital and prescribed  portfolio  standards,  with a high
level of income  exempt  from  Federal  income  tax by  investing  primarily  in
municipal instruments.


Principal Investment Strategies and Risks

Investment Strategies
The  Portfolio  seeks  to  achieve  its  objective  by  investing  primarily  in
high-quality  short-term  instruments,  the  interest  on which is  exempt  from
Federal income tax ("municipal instruments"). These may include:

          Fixed and variable rate notes and similar debt instruments;

          Tax-exempt commercial paper;

     Rated and unrated municipal bonds, notes, paper or other instruments; and

     Municipal bonds and notes which are guaranteed as to principal and interest
or backed by the U.S. government or its agencies or instrumentalities.

Under normal market conditions,  at least 80% of the Portfolio's net assets will
be invested in municipal  instruments.  Interest  earned by the Portfolio on AMT
obligations  ("private  activity bonds") the interest on which may be treated as
an item of tax preference to shareholders under the Federal  alternative minimum
tax, will not be deemed to have been derived from municipal  instruments for the
purposes  of  determining   whether  the  Portfolio   meets  this  policy.   For
shareholders subject to AMT, a limited portion of the Portfolio's  dividends may
be subject to Federal tax.

During extraordinary circumstances,  however, the Portfolio may take a temporary
defensive  posture and hold  uninvested  cash or invest in AMT  obligations  and
taxable short-term securities without limitation.


Taxable  investments will consist  exclusively of those  instruments that may be
purchased by the Diversified Assets Portfolio including U.S.  dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and custodial  receipts with respect thereto;  and repurchase
agreements relating to the above instruments.  Risks These primary investment
risks apply to the Portfolio:  stable NAV risk,  interest rate risk,  credit (or
default)  risk,  guarantor  (or  credit  enhancement)  risk,   management  risk,
liquidity   risk,    prepayment   (or   call)   risk,   debt   extension   risk,
project/industrial development bond risk, tax risk and Year 2000 risk. These and
other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.



<PAGE>


Municipal Portfolio

Investment Objective

The Portfolio seeks to provide,  to the extent  consistent with the preservation
of capital,  a high level of income  exempt from regular  Federal  income tax by
investing  primarily in municipal  instruments.  This  objective  may be changed
without shareholder approval.

Principal Investment Strategies and Risks

Investment Strategies
The  Portfolio  seeks  to  achieve  its  objective  by  investing  primarily  in
high-quality  short-term municipal instruments.  The high level of income sought
by the  Portfolio is relative to yields  currently  available in the  tax-exempt
market place. Municipal instruments are debt instruments,  the interest on which
is exempt from regular Federal income tax. These may include:

          Fixed, variable and floating rate notes and bonds;

          Asset-backed securities;

          Tax-exempt commercial paper;

          Municipal bonds, notes, paper or other instruments; and

     Muncipal  bonds and notes which are guaranteed as to principal and interest
or backed by the U.S. government or its agencies or instrumentalities.

Under normal  circumstances,  at least 80% of the Portfolio's net assets will be
invested in municipal instruments. Subject to this limitation, the Portfolio may
hold  uninvested  cash and  invest  in  taxable  instruments.  During  temporary
defensive periods,  however, all or any portion of the Portfolio's assets may be
held uninvested or invested in taxable instruments.

The Portfolio is not limited in the amount of its assets that may be invested in
AMT obligations  ("private activity bonds") the interest on which may be treated
as an item of tax  preference  to  shareholders  under the  Federal  alternative
minimum  tax.  For  shareholders  subject to AMT, a  significant  portion of the
Portfolio's  dividends  may be subject to Federal  tax. The  Portfolio  does not
currently intend to invest in AMT obligations.  The Portfolio retains,  however,
the ability to invest any or all of its assets in AMT obligations, and may do so
in the future.


Taxable investments will normally consist of U.S. dollar-denominated obligations
of U.S. banks,  foreign  commercial banks and securities issued or guaranteed by
foreign  governments;  high quality commercial paper;  other  obligations,  high
quality  corporate bonds and notes;  securities issued or guaranteed by the U.S.
government,  its  agencies or  instrumentalities  and  custodial  receipts  with
respect thereto;  and repurchase  agreements  relating to the above instruments.
Risks These  primary  investment  risks apply to the  Portfolio:  stable NAV
risk,  interest  rate  risk,  credit (or  default)  risk,  guarantor  (or credit
enhancement) risk,  management risk, liquidity risk,  prepayment (or call) risk,
debt extension risk, project/industrial development bond risk, tax risk and Year
2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.



<PAGE>


Principal Investment Risks

All  investments  carry some  degree of risk  which  will  affect the value of a
Portfolio's  investments,  investment  performance,  yield  and the price of its
shares.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.

The following summarizes the principal risks that may affect the Portfolios.


Risks that apply to ALL Portfolios:


Stable  NAV  risk is the risk that a Portfolio  will not be able to
maintain a net asset value per share of $1.00 at all times.

      Interest  rate risk is the risk that  during  periods  of rising  interest
     rates, a Portfolio's  yield (and the market value of its  securities)  will
     tend to be lower  than  prevailing  market  rates;  in  periods  of falling
     interest  rates,  a  Portfolio's   yield  (and  the  market  value  of  its
     securities) will tend to be higher.


Guarantor  (or  Credit  enhancement)  risk is the risk that  changes in
     credit  quality  of a U.S.  or  foreign  bank,  insurance  company or other
     financial  institution could cause a Portfolio's  investments in securities
     backed by letters  of credit or other  credit  enhancements  issued by such
     bank or institution to decline in value.

      Management  risk  is the  risk  that a  strategy  used  by the  investment
management team may fail to produce the intended results.

      Liquidity  risk  is the  risk  that a  Portfolio  will  not be able to pay
     redemption  proceeds on the same  Business  Day that  shares are  redeemed,
     because  of  unusual  market  conditions,   an  unusually  high  volume  of
     redemption requests or other reasons.

     Year 2000 risk is the risk that a  Portfolio's  operations or value will be
adversely affected by the "Year 2000 Problem." (For more information, please see
"Year 2000 Issues" on page [xx]).

Risk that applies primarily to the Government Select and Government Portfolios:

     Government  securities  risk is the risk that the U.S.  government will not
provide  financial support to U.S.  government  agencies,  instrumentalities  or
sponsored enterprises if it is not obligated to do so by law.


     Risks  that apply  primarily  to the  Diversified  Assets,  Tax-Exempt  and
Municipal Portfolios:

      Credit  (or  Default)  risk is the risk  that an  issuer  of fixed  income
     securities  held by the  Portfolio  may  default on its  obligation  to pay
     interest and repay principal.  Generally,  the lower the credit rating of a
     security, the greater the risk that the issuer of the security will default
     on its obligation.  High quality  securities are generally believed to have
     relatively low degrees of credit risk.

      Prepayment  (or Call) risk is the risk that an issuer  will  exercise  its
     right to pay  principal on an  obligation  held by a Portfolio  (such as an
     asset-backed  security)  earlier than  expected.  This may happen  during a
     period of declining interest rates. Under these circumstances,  a Portfolio
     may be unable to recoup all of its initial  investment and will suffer from
     having  to  reinvest  in lower  yielding  securities.  The  loss of  higher
     yielding securities and the reinvestment at lower interest rates can reduce
     a Portfolio's income.

      Debt  extension risk is the risk that an issuer will exercise its right to
     pay  principal  on  an  obligation  held  by  the  Portfolio  (such  as  an
     asset-backed security) later than expected. This may happen during a period
     of rising  interest  rates.  Under  these  circumstances,  the value of the
     obligation  will decrease and a Portfolio will suffer from the inability to
     invest in higher yielding securities.


Risks that apply to the Tax-Exempt and Municipal Portfolios:

      Project/industrial  development bond risk is the risk that a Portfolio may
     be more sensitive to an adverse economic, business or political development
     if it invests  more than 25% of its  assets in  municipal  instruments  the
     interest upon which is paid solely from revenues of similar projects, or in
     industrial development bonds.

      Tax risk is the risk that future legislative or administrative  changes or
court  decisions  may  materially  affect the  ability of the  Portfolio  to pay
tax-exempt dividends.

More  information  about the risks of investing in the Portfolios is provided in
"Risks,  Securities and Techniques" beginning on page [XX]. You should carefully
consider the risks discussed in these sections before investing in a Portfolio.


Portfolio Performance

Service Shares of the Government  Select,  Government and Tax-Exempt  Portfolios
have less than one calendar year's performance. For this reason, the performance
information  shown below is for  another  class of shares  (Shares)  that is not
offered in this  Prospectus  because  both  Service  Shares  and Shares  will be
invested in the same  portfolio of  securities.  In reviewing  this  performance
information,  however,  you should be aware  that  Service  Shares  have a 0.33%
(annualized)  Service Fee and a 0.01%  (annualized)  Transfer  Agency fee, while
Shares have neither of these fees.  If the  expenses of the Service  Shares were
reflected, performance would be substantially lower.

The bar charts and tables  that  follow  provide an  indication  of the risks of
investing  in a  Portfolio.  The bar charts and tables  assume  reinvestment  of
dividends and  distributions.  A Portfolio's past performance is not necessarily
an  indication  of how the  Portfolio  will  perform in the future.  Performance
reflects  certain  expense  limitations  (as set forth in the  Footnotes  to the
"Portfolio  Fees and Expenses" table on page [ ]) that were in effect during the
periods  presented.  If expense  limitations  were not in place,  a  Portfolio's
performance would have been reduced. The bar charts and tables have been omitted
for the Municipal Portfolio because the Portfolio has been in operation for less
than one calendar year.



<PAGE>



Government Select Portfolio

                      [Bar Chart]

            Calendar Year Total Return (Shares)

                                               1991:         5.95%
                                               1992:         3.68%
                                               1993:         3.04%
                                               1994:         4.09%
                                               1995:         5.82%
                                               1996:         5.29%
                                               1997:         5.44%
                                               1998:         5.40%

                                               1999:        [XXX]%


Best and Worst Quarterly Performance (shares):

Best Quarter Return:              Q[ ] `[  ]                +[  ]%
Worst Quarter Return:             Q[ ] `[  ]                +[  ]%

Average Annual Total Return (Shares) (for the periods ended December 31, 1999)

                           1-Year              5-Year Since Inception (11/17/90)
Government Select           [ ]%                [ ]%                    [ ]%
Portfolio

The 7-day yield for Service  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.



<PAGE>



Government Portfolio


[Bar Chart]

Calendar Year Total Return (Shares)

                                               1989:         9.00%
                                               1990:         8.13%
                                               1991:         6.10%
                                               1992:         3.84%
                                               1993:         2.94%
                                               1994:         3.93%
                                               1995:         5.65%
                                               1996:         5.17%
                                               1997:         5.34%
                                               1998:         5.30%

                                               1999:         [XXX]%

Best and Worst Quarterly Performance (shares):

Best Quarter Return:              Q[ ] `[  ]                +[  ]%
Worst Quarter Return:             Q[ ] `[  ]                +[  ]%

Average Annual Total Return (Shares) (for the periods ended December 31, 1999)

                       1-Year  5-Year 10-Year        Since Inception (10/29/85)
Government                             [ ]%                     [ ]%
Portfolio             [ ]%     [ ]%


The 7-day yield for Service  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.





<PAGE>


Diversified Assets Portfolio


[Bar Chart]

Calendar Year Total Return


                                             1999: [XXX]%

Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[  ]              [XXX]%
Worst Quarter Return:               Q[ ] `[  ]              [XXX]%


Average Annual Total Return (for the periods ended December 31, 1999)

Diversified Assets Portfolio

1-Year            Since Inception ([ ])
[  ]%                     [ ]%

The 7-day yield for Service  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>



Tax-Exempt Portfolio


[Bar Chart]

Calendar Year Total Return (Shares)

                                               1989:         6.23%
                                               1990:         5.86%
                                               1991:         4.54%
                                               1992:         2.91%
                                               1993:         2.27%
                                               1994:         2.61%
                                               1995:         3.73%
                                               1996:         3.33%
                                               1997:         3.45%
                                               1998:         3.29%

                                               1999: [XXX]%

Best and Worst Quarterly Performance (shares):

Best Quarter Return:              Q[ ] `[  ]                +[  ]%
Worst Quarter Return:             Q[ ] `[  ]                +[  ]%

Average Annual Total Return (Shares) (for the periods ended December 31, 1999)

                     1-Year 5-Year     10-Year        Since Inception (8/12/83)
Tax-Exempt           [  ]%  [  ]%      [ ]%                     [ ]%
Portfolio


The 7-day yield for Service  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>


Portfolio Fees and Expenses

This table  describes the fees and expenses that you may pay if you buy and hold
Service  Shares of the  Portfolios.  Please  note that it does not  reflect  any
charges  which may be imposed by The Northern  Trust  Company,  its  affiliates,
correspondent  banks and other  institutions  on their  Customers (as defined on
page [ ]).  (For  more  information,  please  see  "Account  Policies  and Other
Information" on page [ ].)
<TABLE>
<CAPTION>
<S>                                                           <C>              <C>        <C>                 <C>         <C>

                                                             Government Select Government Diversified Assets Tax -Exempt  Municipal

Shareholder Fees (fees paid directly from your investment)
    Sales Charge (Load) Imposed on Purchases.................. None            None        None                None        None
    Deferred Sales Charge (Load)                               None            None        None                None        None
    Sales Charge (Load) Imposed on Reinvested
        Distributions......................................... None            None        None                None        None
    Redemption Fees........................................... None            None        None                None        None
    Exchange Fees............................................. None            None        None                None        None

Annual Portfolio Operating Expenses (expenses that are
deducted
     from Portfolio assets) 1
    Management Fees2.......................................... 0.25%           0.25%       0.25%               0.25%       0.25%
    Distribution (12b-1) Fees................................. None            None        None                None        None
    Other Operating Expenses..................................
      Servicing Agent Fees.................................... 0.25%           0.25%       0.25%               0.25%       0.25%
      Transfer Agency Fees..................................   0.01%           0.01%       0.01%               0.01%       0.01%
      Other Expenses3......................................... 0.21%           0.21%       0.21%               0.22%       0.22%
    Total Other Operating Expenses............................ 0.47%           0.47%       0.47%               0.48%       0.48%

    Total Annual Portfolio Operating Expenses4................ 0.72%           0.72%       0.72%               0.73%       0.73%


</TABLE>


<PAGE>



- --------------------------------
         Footnotes

     1 The Municipal  Portfolio's  annual operating expenses are based on actual
fees and estimated expenses for the current fiscal year.

2        For the fiscal year ended November 30, 1999, The Northern Trust Company
         voluntarily  waived a portion of its management fees for the Government
         Select and Municipal Portfolios. As a result of the fee waivers, actual
         management fees paid by the Government Select and Municipal  Portfolios
         were 0.10% of each  Portfolio's  average daily net assets.  Fee waivers
         may be  terminated  at any time at the  option  of the  Northern  Trust
         Company.

3        "Other Expenses" include (1) administration or  co-administration  fees
         and all other ordinary  operating expenses of each Portfolio not listed
         above and (2) the payment of a fee to  Northern  or other  institutions
         under a  Service  Plan  equal to 0.08% of the  average  daily net asset
         value of the Service shares for systems  support and related  services.
         For the fiscal  year ended  November  30,  1999,  Goldman,  Sachs & Co.
         ("Goldman  Sachs") was entitled to an  administration  fee at an annual
         rate of 0.10% of the average daily net assets of each Portfolio. During
         the  same  period,   Goldman  Sachs  reimbursed   expenses   (including
         administration fees, but excluding management and transfer agency fees,
         servicing fees and certain extraordinary expenses) which exceeded on an
         annualized basis 0.10% of each Portfolio's average daily net assets. As
         a result of the expense reimbursement,  actual other operating expenses
         paid by the  Government,  Government  Select,  Diversified  Assets  and
         Tax-Exempt  Portfolios were 0.10% of each Portfolio's average daily net
         assets.  On May 1, 1999,  The Northern Trust Company  ("Northern")  and
         PFPC Inc.,  formerly First Data Investor  Services Group, Inc. ("PFPC")
         replaced  Goldman Sachs as the Portfolios'  co-administrators,  and are
         entitled to a  co-administration  fee from the Portfolios at the annual
         rates set forth above. Under their Co-Administration Agreement with the
         Trust,  which  may  be  amended  without  shareholder   approval,   the
         co-administrators   have  agreed  indefinitely  to  reimburse  expenses
         (including fees payable to Northern and PFPC as co-administrators,  but
         excluding  management  fees,  transfer agency fees,  servicing fees and
         extraordinary  expenses)  which exceed on an annualized  basis 0.10% of
         each Portfolio's  average daily net assets.  As a result of the expense
         reimbursement, "Other Expenses" are currently 0.18% of each Portfolio's
         average daily net assets.

4        As a result of the fee waivers and expense  reimbursements,  the actual
         management  fees,  distribution  (12b-1) fees, other expenses and total
         annual operating  expenses for each Portfolio for the fiscal year ended
         November 30, 1999 were as set forth below.  Fee waivers (and  voluntary
         expense reimbursements, if applicable) may be terminated at any time at
         the  option  of  Northern.  If this  occurs,  "Total  Annual  Portfolio
         Operating Expenses" may increase without shareholder approval.

Service Shares
<TABLE>
<CAPTION>
<S>                    <C>                   <C>                 <C>                  <C>
                                                                                      Total Annual
                       Management            Distribution                              Operating Expenses
                       Fees                  (12b-1) Fees        Other Expenses

Government Select      0.10%                 0.00%               0.44%                 0.54%
Government             0.25%                 0.00%               0.44%                 0.69%
Diversified Assets     0.25%                 0.00%               0.44%                 0.69%
Tax-Exempt             0.25%                 0.00%               0.44%                 0.69%
Municipal              0.10%                 0.00%               0.44%                 0.54%



</TABLE>





<PAGE>



Example

The  following  Example is intended to help you compare the cost of investing in
Service Shares of a Portfolio  (without fee waivers and expense  reimbursements)
with the cost of investing in other mutual funds.

The Example  assumes that you invest $10,000 in a Portfolio for the time periods
indicated (with reinvestment of all dividends and distributions) and then redeem
all of your Service Shares at the end of those periods. The Example also assumes
that your investment has a 5% return each year and that a Portfolio's  operating
expenses  remain the same.  Although  your actual  costs may be higher or lower,
based on these assumptions your costs would be:

<TABLE>
<CAPTION>
<S>                                                           <C>          <C>          <C>           <C>

Portfolio                                                     1 Year       3 Years      5 Years       10 Years

Government Select
     Service Shares.....................................       $74           $230         $401         $894

Government
     Service Shares.....................................       $74           $230         $401         $894

Diversified Assets
     Service Shares.....................................       $74           $230         $401         $894

Tax-Exempt
     Service Shares.....................................       $75           $233         $406         $906

Municipal
     Service Shares.....................................       $75           $233         $406         $906


</TABLE>


<PAGE>


41


MANAGEMENT OF THE PORTFOLIOS

Investment Adviser

The Northern Trust Company ("Northern" or the "Investment Adviser"), an Illinois
state-chartered  bank and  member  of the  Federal  Reserve  System,  serves  as
investment  adviser for the Portfolios.  The Investment Adviser is located at 50
South LaSalle Street,  Chicago,  Illinois 60675 and is a wholly-owned subsidiary
of Northern Trust Corporation,  a bank holding company. As of December 31, 1999,
Northern Trust  Corporation and its subsidiaries had  approximately $[ ] billion
in assets, $[ ] billion in deposits and employed over [ ] persons.


Northern  has for more  than 100 years  managed  the  assets of  individuals,
charitable   organizations,   foundations  and  large  corporate  investors.
Northern and its affiliates  administrated in various  capacities  (including as
master trustee,  investment manager or custodian) approximately $[ ] trillion of
assets as of December 31, 1999,  including  approximately $[ ] billion of assets
for which Northern and its affiliates had investment management  responsibility.
Under its Advisory Agreement with the Trust, the Investment Adviser,  subject to
the general  supervision of the Trust's Board of Trustees,  is  responsible  for
making investment decisions for the Portfolios and for placing purchase and sale
orders for portfolio securities.


Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses,  the  Investment  Adviser  is  entitled  to an  advisory  fee from the
Portfolios, computed daily and payable monthly, at annual rates set forth in the
table below  (expressed as a percentage of each Portfolio's  respective  average
daily net assets).  The table also reflects the advisory  fees (after  voluntary
fee waivers) paid by the Portfolios as a percentage of net assets for the fiscal
year ended November 30, 1999.

Portfolio                                                     Advisory Fee Paid
                                                                For Fiscal Year
                                        Contractual Rate         Ended 11/30/99
Government Select.......................    0.25%                    0.10%
Government..............................    0.25%                    0.25%
Diversified Assets......................    0.25%                    0.25%
Tax-Exempt..............................    0.25%                    0.25%
Municipal...............................    0.25%                     N/A

The difference,  if any,  between the  contractual  advisory fees and the actual
advisory fees paid by the Portfolios  reflects that the  Investment  Adviser did
not  charge  the full  amount of the  advisory  fees to which it would have been
entitled.  The  Investment  Adviser  may  discontinue  or modify  its  voluntary
limitations in the future at its discretion.

Portfolio Management

     The Investment Adviser employs a team approach to the investment management
of the Portfolios, relying upon investment professionals under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern.  Mr. Snyder  oversees the  management of all fixed income,  equity and
money  market  assets  managed by the  Investment  Adviser.  Mr.  Snyder  joined
Northern Trust in 1980.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer Agent") and custodian for each
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its  services in those  capacities  are  described in the
Statement of Additional Information.  In addition,  Northern and its affiliates,
banks,  trust companies and other  institutions and organizations may enter into
agreements for the provision of administrative  support services for the Service
Share  investors.  Northern  and  other  institutions  may  provide  consulting,
technology  and  systems  support  services  and receive  fees  relating to cash
management  or sweep  account  services  under a Service  Plan  described  under
"Account Policies and Other Information - Servicing Agents" on page [ ].

     Northern and PFPC act as  co-administrators  for each  Portfolio.  The fees
that  Northern  and  PFPC  receive  for  their  co-administrative  services  are
described on page
[  ] under "Portfolio Fees and Expenses."



ABOUT YOUR ACCOUNT

Purchasing and Selling Service Shares

Investors

Institutional  investors,  which are  acting on their own behalf or on behalf of
their customers,  clients, employees,  participants and others ("Customers") and
enter into a servicing  agreement with the Trust  ("Servicing  Agreement"),  may
invest in the  Service  Shares of each  Portfolio  through  their  institutional
accounts at Northern or an affiliate.  They may also establish accounts directly
with the Trust.  There is no sales charge imposed on investments.  Institutional
investors ("Institutions") include:


               Northern and its affiliates;
               Defined  contribution plans having at least $30 million in assets
               or  annual  contributions  of at  least  $5  million;  and  Other
               institutions and organizations.

Share Classes

     Each Portfolio offers three classes of shares:  Shares,  Service Shares and
Premier   Shares.   Shares  and  Premier   Shares  are   described  in  separate
prospectuses.

      Shares do not provide for payments by the  Portfolio to  Institutions  for
administrative support or shareholder liaison services.

      Service Shares are designed for Institutions that agree with the Portfolio
     to  provide  (or  arrange  for the  provision  of)  administrative  support
     services to Customers.

      Premier Shares are designed for Institutions that agree with the Portfolio
     to provide (or arrange for the  provision  of)  administrative  support and
     shareholder liaison services to Customers.

Shares of each class bear their pro rata portion of all operating  expenses paid
by the Portfolio,  except  amounts  payable under the Service Plan that has been
adopted  for the  Portfolio's  Service  Shares and Premier  Shares and  transfer
agency fees.  The Service Plan  provides for payments at an annual rate of up to
0.33% of the average daily net asset value of Service  Shares.  Because of these
class-specific  expenses, the performance of the Shares of a Portfolio described
in this  Prospectus  is expected to be higher than the  performance  of both the
Service Shares and Premier Shares of the same Portfolio and the performance of a
Portfolio's  Service Shares is expected to be higher than the performance of the
same Portfolio's Premier Shares.

Opening an Account

You may purchase  Service  Shares of each Portfolio  through your  institutional
account at Northern (or an affiliate)  or you may open an account  directly with
the  Trust  with a  minimum  initial  investment  of $5  million  in one or more
portfolios of the Trust. This minimum does not apply, however, to Service Shares
purchased  through a  Northern  cash  sweep  program.  There is no  minimum  for
subsequent investments.


Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  Service  Shares  through  your  account,  contact your
Northern representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase Service Shares directly from the Trust as described in this Prospectus.


     By Mail.
               Read this Prospectus carefully. Complete and sign the new account
               application.
               Include a certified  corporate  resolution  (or other  acceptable
evidence of authority).
               Enclose a check or Federal  Reserve draft payable to the specific
              Portfolio. If investing in more than one Portfolio, please include
              a separate check for each.
               Mail your check,  corporate resolution and completed  application
to:
                  Northern Institutional Funds
                  c/o The Northern Trust Company
                  P.O. Box 75943
                  Chicago, Illinois 60675-5943

     All checks must be payable in U.S.  dollars and drawn on a bank  located in
the United States. Cash and third party checks are not acceptable.

     By Telephone.
               Read  this  Prospectus  carefully.  Call  the  Transfer  Agent at
               1-800-637-1380.
      To open a new account please provide:
                   The name of the  Portfolio  in which you'd like to invest The
                   number of Service  Shares or dollar amount to be invested The
                   method of payment
      To add to an existing account, please provide:
                   The Institution's name
                   Your Account Number

     By Wire or Automated Clearing House Transfer ("ACH Transfer").
      To open a new account:
               Call the Transfer Agent at 1-800-637-1380  for  instructions.  To
      add to an existing account:
               Have your bank wire Federal funds or effect an ACH Transfer to:

                               The Northern Trust Company
                               Chicago, Illinois
                               ABA Routing No. 0710-00152
                               (Reference 10 Digit Portfolio Account No.)
                               (Reference Shareholder's Name)

For more  information  about the purchase of Service  Shares,  call the Transfer
Agent at 1-800-637-1380.


<PAGE>


Selling Service Shares

Through an Institutional Account.  Institutions may sell (redeem) Service Shares
through  their  institutional  account  by  contacting  their  Northern  account
representative.

Directly through the Trust.  Institutions  that purchase Service Shares directly
from the Trust may redeem their Service Shares through the Transfer Agent in one
of the following ways:

     By Mail.
      Send a written request to:
                       Northern Institutional Funds
                       c/o The Northern Trust Company
                       P.O. Box 75943
                       Chicago, Illinois 60675-5943.
      The letter of instruction must include:
                            The signature of a duly authorized person
                            Your account number
                            The name of the Portfolio
                            The number of Service Shares or the dollar amount to
be redeemed.

     By Telephone.
                Call the Transfer Agent at 1-800-637-1380 for instructions.
                During periods of unusual economic or market activity, telephone
               redemptions  may  be  difficult  to  implement.  In  such  event,
               shareholders  should follow the  procedures  outlined above under
               "Selling Service Shares By Mail."

     By Wire.
                Call the Transfer Agent at 1-800-637-1380 for instructions.  You
                must have given authorization for expedited wire redemption. The
                minimum amount that may be redeemed by this method is $10,000.


Account Policies and Other Information


Automatic  Investment  Arrangements.  Institutions  may purchase  Service Shares
through their  institutional  accounts at Northern either by directing automatic
investment  of cash  balances  in excess of certain  agreed  upon  amounts or by
directing  investments from time to time on a non-automatic basis. Northern will
place a purchase order generated under an automatic  investment direction either
on the  Business  Day that  funds are  available  in the  account or on the next
Business Day, depending upon the terms of the automatic investment  arrangement.
Similarly,  Northern will place a redemption  order generated under an automatic
investment  direction  either  on  the  Business  Day  Northern  calculates  the
redemption  amount  needed to bring the  account  balance up to the agreed  upon
amount or on the next  Business Day,  depending  upon the terms of the automatic
investment  arrangement.  If a redemption  order is placed on the next  Business
Day,  Northern  will  normally  provide  funds by  provisionally  crediting  the
Institution's  account on the day the calculation is made.  Institutions  should
contact  Northern  for  more  information   about  their  automatic   investment
arrangements.  Purchase and Redemption Minimums.  There is a minimum initial
investment  of $5  million  in a  Portfolio  and  one or more  other  investment
portfolios of the Trust. This minimum does not apply, however, to Service Shares
purchased  through a  Northern  cash  sweep  program.  There is no  minimum  for
subsequent  investments.  A $10,000 minimum applies for redemptions by wire. The
Trust  reserves  the right to waive  purchase  and  redemption  minimums  and to
determine the manner in which a minimum is satisfied.

Calculating  Share Price.  The Trust issues Service  Shares and redeems  Service
Shares at net asset value  ("NAV").  The NAV for each share class of a Portfolio
is  calculated  by dividing the value of net assets  attributed to that class by
the number of  outstanding  shares of the class.  The NAV for each Portfolio and
class is  calculated as of 3:00 p.m.,  Chicago time,  each Business Day. The NAV
used in determining the price of your Service Shares is the one calculated after
your purchase, exchange or redemption order is received or accepted as described
below.

Each  Portfolio  seeks to  maintain  an NAV of $1.00  per share by  valuing  the
obligations  held by it at amortized  cost in accordance  with SEC  regulations.
Amortized cost will normally approximate market value.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 1:00 p.m., Chicago time, on any Business Day will be
executed the same day, provided that either:

                The Transfer  Agent  receives  the purchase  price in Federal or
               other  immediately  available  funds prior to 1:00 p.m.,  Chicago
               time, the same Business Day;
                The order is accepted by an authorized  intermediary and payment
               is to be made by the close of the same Business Day in Federal or
               other   immediately   available  funds  according  to  procedures
               authorized by the Trust; or
                Payment  in  Federal  or other  immediately  available  funds is
               received   by  the  close  of  the  same   Business   Day  in  an
               institutional account maintained with Northern or an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 1:00 p.m.,  Chicago  time,  on a Business Day will be
executed on the next Business Day, provided that payment is made as noted above.
We consider  requests  to be in "good  order" when all  required  documents  are
properly  completed,  signed  and  received,  including  a  certified  corporate
resolution or other acceptable evidence of authority. If an Institution pays for
Service Shares by check,  Federal funds generally will become  available  within
two Business Days after a purchase order is received.

If payment is not received as described above from an authorized intermediary on
the same Business Day of acceptance of an order by the authorized  intermediary,
the  authorized  intermediary  may  be  liable  for  fees  and  losses  and  the
transaction may be cancelled.

In  certain  circumstances,  the Trust may  advance  the time by which  purchase
orders must be received. See "Early Closings" on page [ ].

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.

In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment  for  Service  Shares  in the form of  securities  that are  permissible
investments  for  a  Portfolio.  The  Trust  also  reserves  the  right  to  pay
redemptions by a distribution  "in-kind" of securities  (instead of cash) from a
Portfolio.  See the Statement of Additional  Information for further information
about the terms of these purchases and redemptions.

Miscellaneous Purchase Information.

      Institutions  are  responsible  for  transmitting  purchase  orders to the
Transfer Agent and delivering required funds on a timely basis.
      Institutions are responsible for all losses and expenses of a Portfolio in
     the  event of any  failure  to make  payment  according  to the  procedures
     outlined in this Prospectus. Northern may redeem shares from any account it
     maintains to protect the Portfolios and Northern against loss. In addition,
     a $20 charge will be imposed if a check does not clear.
      Service  Shares of a Portfolio are entitled to the  dividends  declared by
     the Portfolio beginning on the Business Day the purchase order is executed,
     provided  payment  in  Federal  or  other  immediately  available  funds is
     received by the Transfer Agent by the time designated above.
      The Trust reserves the right to reject any purchase order.  The Trust also
reserves the right to change or discontinue any of its purchase procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
will be effected at the NAV next  determined  after your  exchange or redemption
order is received in good order.  Good order means that the request includes the
following:  the account number and Portfolio name; the amount of the transaction
(as  specified in dollars or shares);  and the  signature  of a duly  authorized
person (except for telephone and wire  redemptions).  See "Account  Policies and
Other Information - Making Changes to Your Account Information."

If either the Transfer  Agent or Northern  (with  respect to your  institutional
account)  receives a redemption order by 1:00 p.m.,  Chicago time, on a Business
Day,  redemption  proceeds  will  normally  be paid in  Federal  funds  or other
immediately  available funds wired or sent by check to you or, if you so choose,
to your institutional account with Northern, on the same Business Day.

Redemption  orders received after 1:00 p.m.,  Chicago time, will be effected the
next Business Day. Proceeds for redemption orders received on a non-Business Day
will normally be sent on the next Business Day after receipt in good order.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page [ ].

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

      The  Trust  reserves  the  right to defer  crediting,  sending  or  wiring
     redemption  proceeds for up to 7 days after receiving the redemption  order
     if, in its judgment, an earlier payment could adversely affect a Portfolio.

      If you are redeeming  recently  purchased Service Shares,  your redemption
     request may not be honored until your check or electronic  transaction  has
     cleared. This may delay your transaction for up to 15 days.

      Institutions  are responsible for  transmitting  redemption  orders to the
     Transfer  Agent and crediting  their  Customers'  accounts with  redemption
     proceeds on a timely basis.

      Redemption  requests  by mail  must be signed  by a person  authorized  by
acceptable documentation on file with the Transfer Agent.

      Dividends on Service Shares are earned through and including the day prior
to the day on which they are redeemed.

      The  Trust  reserves  the  right  to  redeem  Service  Shares  held by any
     shareholder  who provides  incorrect or incomplete  account  information or
     when  such   involuntary   redemptions   are  necessary  to  avoid  adverse
     consequences to the Trust and its shareholders.

      The Trust may require any information  reasonably necessary to ensure that
a redemption request has been duly authorized.

      The  Trust  reserves  the  right  to  change  or  discontinue  any  of its
redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their  account  agreements)  may exchange  Service  Shares of a Portfolio for
Service Shares of another Portfolio.  The registration of both accounts involved
must be  identical.  A $1,000  minimum  investment  applies.  An  exchange  is a
redemption of shares you own and the purchase of shares you are acquiring. It is
considered a taxable event and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days written notice to shareholders  and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Advance  Notification  of  Large  Transactions.   The  Trust  requests  that  an
Institution  give advance  notice to the Transfer  Agent by 11:00 a.m.,  Chicago
time,  if it intends to place a purchase  or  redemption  order of $5 million or
more on a Business Day.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

     Business Day. A "Business  Day" is each Monday through Friday when Northern
or the New York Stock  Exchange is open for business.  A "Business Day" does not
include a holiday observed by Northern and the Exchange.  In 2000 these holidays
are: New Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolios  reserve the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  They also reserve this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering funds on a timely basis. A Portfolio will be
deemed to have  received an order when the order is  accepted by the  authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Servicing   Agents.   Institutions   perform  (or  arrange  to  have  performed)
administrative  support services and personal and account  maintenance  services
for Customers who are the beneficial  owners of Service Shares through Servicing
Agreements with the Trust ("Servicing  Agents").  These Servicing Agreements are
permitted  under the Trust's Service Plan ("Service  Plan").  These services may
include:

          establishing and maintaining individual accounts and records;

          processing purchase, redemption and exchange orders;

     placing net purchase and redemption  orders with Northern  acting as
the Trust's Transfer Agent; and

  providing cash management or sweep accounts and similar programs and services.


Servicing  Agents will receive fees from the Portfolios for these services at an
annual rate of up to 0.25% of the  average  daily net asset value of the Service
Shares beneficially owned by their Customers. The Service Plan also provides for
the payment of fees to Northern, PFPC or other Institutions at an annual rate of
up to 0.08% of the average daily net asset value of Service  Shares  serviced by
Institutions  for ongoing  consulting,  technology and systems support  services
relating to cash  management or sweep account  services.  All fees payable under
the Service Plan are borne solely by Service  Shares and not by the  Portfolios'
other share classes.

Northern  may  provide  additional  compensation  to certain  dealers  and other
financial  intermediaries  who provide services to their Customers who invest in
the Trust or whose Customers purchase significant amounts of Service Shares of a
Portfolio.  The amount of such  compensation  may be made on a  one-time  and/or
periodic basis,  and may represent all or a portion of the annual fees earned by
Northern as Investment  Adviser (after  adjustments).  This compensation will be
paid by Northern or its affiliates and will not represent an additional  expense
to the Trust or its shareholders.

You should read your account  agreement with your  Institution  carefully.  Your
Institution's  requirements may differ from those listed in this Prospectus.  An
Institution may impose account charges,  such as asset allocation fees,  account
maintenance  fees,  and other  charges  that will  reduce  the net  return on an
investment in a Portfolio. If you have agreed to maintain a minimum balance with
your  Institution and the balance falls below this minimum,  you may be required
to redeem all or a part of your investment in a Portfolio.

Conflict of interest  restrictions may apply to the receipt of compensation from
the Trust by an Institution in connection with the investment of fiduciary funds
in Service Shares of a Portfolio.  Banks and other institutions regulated by the
Office of Comptroller of the Currency, Board of Governors of the Federal Reserve
System and state banking  commissions,  and investment  advisers and other money
managers  subject to the  jurisdiction  of the SEC, the  Department  of Labor or
state securities commissions, are urged to consult legal counsel before entering
into Servicing Agreements.

State  securities  laws  regarding the  registration  of dealers may differ from
Federal law. As a result,  Institutions investing in the Portfolios on behalf of
their Customers may be required to register as dealers.


Distributions and Taxes

Distributions

Dividends  from net income are declared daily and paid monthly by each Portfolio
to its  shareholders.  Net income includes the interest accrued on a Portfolio's
assets less estimated expenses. Each Portfolio's net realized short-term capital
gains, if any, are  distributed at least annually.  The Portfolios do not expect
to realize net long-term capital gains.

Dividends  are  paid as soon as  practicable  following  the end of each  month,
except in the case of a total redemption of Service Shares in an account that is
not subject to a standing order for the purchase of additional  Service  Shares.
In that  event,  dividends  will be paid  promptly  along  with  the  redemption
proceeds.

[All  distributions are automatically  reinvested  (without any sales charge) in
additional  Service  Shares of the same  Portfolio,  unless you elect to receive
distributions  in cash by notifying the Transfer Agent in writing.] You may make
arrangements to credit these  distributions  to your account with Northern,  its
affiliates or its correspondent banks.

There are no fees or sales charges on reinvestments.

Taxes


Each Portfolio intends to qualify as a regulated  investment company for Federal
tax  purposes,  and  to  distribute  substantially  all  of its  net  income  to
shareholders  each  year.  Except  for  exempt-interest  dividends  paid  by the
Tax-Exempt and  Municipal Portfolios,  dividends  derived  from taxable
interest income and short-term capital gains will be taxable as ordinary income,
and  distributions,  if any,  derived  from net  long-term  capital  gains  will
generally  be  taxable  as   long-term   capital   gains,   unless  you  have  a
tax-advantaged  account.  This is true whether  dividends and  distributions are
received in cash or reinvested in Portfolio Service Shares.


The Tax-Exempt and  Municipal Portfolios intend to pay substantially all
of their dividends as "exempt-interest dividends," which are exempt from Federal
income tax.  Shareholders  who are recipients of Social Security Act or Railroad
Retirement Act benefits should note that exempt-interest dividends will be taken
into account in determining the taxability of their benefit payments.  If you
receive an  exempt-interest  dividend with respect to any share and the share is
held for six months or less,  any loss on the sale or exchange of the share will
be disallowed  to the extent of the dividend  amount.  Interest on  indebtedness
incurred by a shareholder  to purchase or carry shares of either the  Tax-Exempt
or Municipal  Portfolios generally will not be deductible for federal income tax
purposes.  In certain  instances,  dividends paid by the Tax-Exempt and
Municipal  Portfolios,  while exempt from regular Federal income tax, may be
subject to the alternative  minimum tax. In addition,  the Tax-Exempt  Portfolio
may invest a portion of its assets in securities  that  generate  income that is
not exempt from Federal tax. Any dividends paid by the Tax-Exempt Portfolio that
are  derived  from  taxable  interest or from  capital  gains will be subject to
Federal income tax.


The  Tax-Exempt  and  Municipal  Portfolios  will each  determine  annually  the
percentages  of its net  investment  income  which are exempt  from the  regular
Federal income tax,  which  constitute an item of tax preference for purposes of
the Federal alternative minimum tax, and which are fully taxable. The Tax-Exempt
and  Municipal  Portfolios  will  apply  these  percentages   uniformly  to  all
distributions declared from net investment income during that year.

Except as stated below, you may be subject to state and local taxes on Portfolio
distributions and redemptions. State income taxes may not apply, however, to the
portions  of a  Portfolio's  distributions,  if any,  that are  attributable  to
interest on certain types of Federal securities or interest on securities issued
by the particular state or municipalities within the state.



<PAGE>


Other Tax Information

Dividends and distributions  from each Portfolio will generally be reportable by
you in the tax year in which  they are paid with one  exception.  Dividends  and
distributions declared by a Portfolio in October,  November or December and paid
in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.

Your investment in the Portfolios  could have additional tax  consequences.

Shareholders who are nonresident  aliens,  foreign trusts or estates, or foreign
corporations or partnerships,  may be subject to different United States Federal
income  tax   treatment.  You  should  consult  your  tax  professional  for
information regarding all the tax consequences applicable to your investments in
the  Portfolios.  More  information  is provided in the  Statement of Additional
Information.  This short summary is not intended as a substitute for careful tax
planning.


In  particular,  although  the  Government  Select  Portfolio  intends to invest
primarily  in U.S.  government  securities,  the  interest on which is generally
exempt from state income taxation,  you should consult your own tax professional
to determine  whether this is true in your own situation.  Similarly,  dividends
paid  by  the  Portfolios   (including  the  Tax-Exempt  and   Municipal
Portfolios)  may be taxable  under  state or local law as  dividend  income even
though  all or a portion  of such  dividends  may be derived  from  interest  on
obligations which, if realized directly, would be exempt from such income taxes.


YEAR 2000 ISSUES

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 arrives, many systems may be unable to
accurately process certain date-based  information,  which could cause a variety
of operational problems for businesses. This could have a negative effect on the
companies  in  which  the  Portfolios  invest,   thus  hurting  the  Portfolios'
investment returns.

Northern Trust has implemented  steps to prepare its mission  critical  computer
systems and processes for Year 2000  processing.  It has established a dedicated
Year 2000 Project Team whose members have  significant  systems  development and
maintenance   experience.   Northern   Trust's  Year  2000  project  included  a
comprehensive  testing plan of its mission critical systems.  Northern Trust has
advised the Trust that it has completed work on its mission critical systems and
testing with significant outside parties.

Northern  Trust  instituted a program to monitor and assess the efforts of other
parties,  such as other service providers to the Portfolio.  However,  it cannot
control the success of those other parties' efforts. Contingency plans have been
established where believed necessary to provide Northern Trust with alternatives
in case these entities experience significant Year 2000 difficulties that impact
Northern Trust.

Furthermore,  even if the actions taken by Northern  Trust are  successful,  the
normal   operations  of  the  Portfolios   may,  in  any  event,   be  disrupted
significantly  by the failure of  communications  and public utility  companies,
governmental entities,  financial processors or others to perform their services
as a result of Year 2000 problems.

Efforts in foreign  countries to remediate  potential Year 2000 problems are not
as extensive  as those in the United  States.  As a result,  the  operations  of
foreign markets, foreign issuers and foreign governments may be disrupted by the
Year 2000 problem and the  investment  portfolio of a Portfolio may be adversely
affected.



RISKS, SECURITIES AND TECHNIQUES


This section takes a closer look at some of the types of securities in which the
Portfolios  may invest and their  related  risks.  It also  explores the various
investment  techniques  that the  investment  management  team  may,  but is not
required to, use. The Portfolios may invest in other  securities and are subject
to further  restrictions  and risks  which are  described  in the  Statement  of
Additional Information.

Asset-Backed Securities.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  Asset-backed securities represent  participations in, or are secured
by  and  payable  from,  pools  of  assets  such  as  mortgages,  motor  vehicle
installment sale contracts,  installment loan contracts, leases of various types
of real and personal  property,  receivables from revolving credit (credit card)
agreements and other financial assets.  Such asset pools are securitized through
the use of privately-formed trusts or special purpose corporations.  Payments or
distributions  of principal and interest may be guaranteed up to certain amounts
and for a certain time period by a letter of credit or a pooled insurance policy
issued by a financial institution, or other credit enhancements.


         Investment  strategy.  The  Diversified  Assets  Portfolio,  Tax-Exempt
         Portfolio and Municipal  Portfolio may purchase various types of
         asset-backed securities that are "Eligible Securities" as defined by
         the SEC. The Government Portfolio may only purchase mortgage-backed
         securities that are guaranteed by the U.S. government,  its agencies or
         instrumentalities.

         Special  risks.  In  addition to credit and market  risk,  asset-backed
         securities  involve  prepayment  risk  because  the  underlying  assets
         (loans) may be prepaid at any time.  The value of these  securities may
         also   change   because   of  actual  or   perceived   changes  in  the
         creditworthiness of the originator,  the servicing agent, the financial
         institution  providing the credit support,  or the  counterparty.  Like
         other fixed income  securities,  when interest rates rise, the value of
         an asset-backed security generally will decline. However, when interest
         rates decline,  the value of an  asset-backed  security with prepayment
         features  may not  increase  as much as  that  of  other  fixed  income
         securities.  In addition,  non-mortgage asset-backed securities involve
         certain risks not presented by mortgage-backed  securities.  Primarily,
         these securities may not have the benefit of the same security interest
         in the underlying  collateral.  Credit card  receivables  are generally
         unsecured,  and the debtors are entitled to the  protection of a number
         of state and Federal consumer credit laws.  Automobile  receivables are
         subject to the risk that the trustee for the holders of the  automobile
         receivables may not have an effective  security  interest in all of the
         obligations backing the receivables.


Borrowings and Reverse  Repurchase  Agreements.  The Portfolios may borrow money
from banks and the  Government  Select,  Government,  Diversified  Assets and
Municipal Portfolios may enter into reverse repurchase agreements with banks
and other financial institutions. Reverse repurchase agreements involve the sale
of money  market  securities  held by a  Portfolio  subject  to the  Portfolio's
agreement to repurchase them at a mutually agreed upon date and price (including
interest).


         Investment strategy. Each Portfolio may borrow in amounts not exceeding
         one-third  of  its  total  assets.   Each  of  the  Government  Select,
         Government,  Diversified  Assets and  Municipal  Portfolios  may
         enter into  reverse  repurchase  agreements  in amounts  not  exceeding
         one-third of its total assets (including the amount  borrowed).
         These  transactions  may be entered  into as a  temporary  measure  for
         emergency purposes or to meet redemption  requests.  Reverse repurchase
         agreements may also be entered into when the investment management team
         expects that the interest  income to be earned from the  investment  of
         the  transaction  proceeds  will be greater  than the related  interest
         expense.

         Special risks.  Borrowings and reverse  repurchase  agreements  involve
         leveraging.  If the securities held by the Portfolios  decline in value
         while these  transactions are  outstanding,  the net asset value of the
         Portfolios' outstanding shares will decline in value by proportionately
         more than the decline in value of the securities. In addition,  reverse
         repurchase agreements involve the risks that the interest income earned
         by a Portfolio  (from the investment of the proceeds) will be less than
         the interest expense of the  transaction,  that the market value of the
         securities  sold by a  Portfolio  will  decline  below  the  price  the
         Portfolio is obligated to pay to repurchase  the  securities,  and that
         the securities may not be returned to the Portfolio.

Custodial   Receipts   for   Treasury   Securities.   Custodial   receipts   are
participations in trusts that hold U.S.  Treasury  securities and are sold under
names such as TIGRs and CATS. Like other stripped obligations,  they entitle the
holder to future interest or principal payments on the U.S. Treasury securities.

         Investment strategy. The Government,  Diversified Assets and Tax-Exempt
         Portfolios  may  purchase  custodial   receipts.   Investments  by  the
         Government  Portfolio in custodial  receipts will not exceed 35% of the
         value of its total assets.

         Special risks. Like other stripped obligations,  custodial receipts may
         be subject to greater price  volatility than ordinary debt  obligations
         because of the way in which their  principal  and interest are returned
         to investors.

Derivatives.  Each Portfolio may purchase certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from---or  based
upon---the  performance  of  underlying  assets,  interest or currency  exchange
rates,  or indices.  Derivatives  include  structured debt  obligations  such as
collateralized mortgage obligations and other types of asset-backed  securities,
"stripped" securities and various floating rate instruments.

             Investment strategy. A Portfolio will invest in derivatives only if
             the potential risks and rewards are consistent with the Portfolio's
             objective, strategies and overall risk profile.

             Special risks. Engaging in derivative transactions involves special
             risks,  including (a) market risk that the Portfolio's  derivatives
             position will lose value;  (b) credit risk that the counterparty to
             the transaction will default; (c) leveraging risk that the value of
             the derivative  instrument  will decline more than the value of the
             assets on which it is based;  (d) illiquidity risk that a Portfolio
             will be unable to sell its position because of lack of market depth
             or  disruption;  (e)  pricing  risk that the value of a  derivative
             instrument will be difficult to determine;  and (f) operations risk
             that loss will  occur as a result of  inadequate  systems  or human
             error.  Many types of derivatives have been recently  developed and
             have not  been  tested  over  complete  market  cycles.  For  these
             reasons,  a Portfolio may suffer a loss whether or not the analysis
             of the investment management team is accurate.

Diversification. Diversifying its holdings can help a Portfolio reduce the risks
of investing.  In accordance with current SEC  regulations,  each Portfolio will
not invest more than 5% of the value of its total assets at the time of purchase
in the  securities of any single issuer.  However,  a Portfolio may invest up to
25% of the value of its total assets in the securities of a single issuer for up
to three  Business  Days.  These  limitations  do not  apply  to  cash,  certain
repurchase  agreements,  U.S.  government  securities  or  securities  of  other
investment companies.  In addition,  securities subject to certain unconditional
guarantees and securities that are not "First Tier Securities" as defined by the
SEC are subject to different  diversification  requirements  as described in the
Statement of Additional Information.

Downgraded Securities.  After its purchase, a portfolio security may be assigned
a lower rating or cease to be rated. If this occurs, a Portfolio may continue to
hold the issue if the Investment  Adviser believes it is in the best interest of
the Portfolio and its shareholders.

Foreign  Securities.   The  Diversified  Assets  Portfolio  may  invest  in  the
obligations  of foreign  governments,  or any of their  political  subdivisions,
agencies or instrumentalities,  foreign commercial banks and foreign branches of
U.S. banks. It may also invest in U.S.  dollar-denominated  commercial paper and
other obligations of foreign issuers. Foreign government obligations may include
debt   obligations   of   supranational   entities,    including   international
organizations   (such  as  the  European  Coal  and  Steel   Community  and  the
International  Bank for  Reconstruction and Development (also known as the World
Bank)) and international banking institutions and related government agencies.

     Investment  strategy.  Investments by the Diversified  Assets  Portfolio in
foreign issuer  obligations will not exceed 50% of the Portfolio's  total assets
measured at the time of purchase.

         Special  risks.  Foreign  securities  involve  special risks and costs.
         Foreign  securities,  and in particular  foreign debt  securities,  are
         sensitive to changes in interest rates. In addition,  investment in the
         securities  of  foreign  governments  involves  the risk  that  foreign
         governments  may  default on their  obligations  or may  otherwise  not
         respect the integrity of their debt.

         Investment  in  foreign   securities  may  involve  higher  costs  than
         investment in U.S. securities, including higher transaction and custody
         costs  as  well  as the  imposition  of  additional  taxes  by  foreign
         governments. Foreign investments may also involve risks associated with
         less  complete  financial  information  about the issuers,  less market
         liquidity,  more market  volatility and political  instability.  Future
         political  and  economic  developments,   the  possible  imposition  of
         withholding   taxes   on   dividend   income,   possible   seizure   or
         nationalization   of  foreign   holdings  or  the   adoption  of  other
         governmental  restrictions  might  adversely  affect an  investment  in
         foreign securities. Additionally, foreign banks and foreign branches of
         domestic banks may be subject to less stringent  reserve  requirements,
         and to different accounting, auditing and recordkeeping requirements.

Illiquid  or  Restricted  Securities.  Illiquid  securities  include  repurchase
agreements  and time deposits with  notice/termination  dates of more than seven
days,  certain  variable amount master demand notes that cannot be called within
seven  days,  certain  insurance  funding  agreements  (see  below),  and  other
securities  that are traded in the U.S. but are subject to trading  restrictions
because they are not  registered  under the  Securities  Act of 1933, as amended
(the "1933 Act").

         Investment  strategy.  Each  Portfolio  may invest up to 10% of its net
         assets in securities that are illiquid.  A domestically traded security
         which is not  registered  under  the  1933  Act will not be  considered
         illiquid if the Investment  Adviser determines that an adequate trading
         market exists for that  security.  If otherwise  consistent  with their
         investment  objectives  and  policies,   the  Portfolios  may  purchase
         commercial  paper  issued  pursuant to Section 4(2) of the 1933 Act and
         securities  that are not registered  under the 1933 Act but can be sold
         to "qualified  institutional buyers" in accordance with Rule 144A under
         the 1933 Act. These securities will not be considered  illiquid so long
         as Northern determines,  under guidelines approved by the Trust's Board
         of Trustees, that an adequate trading market exists.

         Special  risks.  Because  illiquid  and  restricted  securities  may be
         difficult  to sell at an  acceptable  price,  they  may be  subject  to
         greater  volatility  and  may  result  in a loss  to a  Portfolio.  The
         practice of  investing in Rule 144A  Securities  and  commercial  paper
         available to qualified institutional buyers could increase the level of
         illiquidity  during  any period  that  qualified  institutional  buyers
         become uninterested in purchasing these securities.

Insurance  Funding  Agreements.  An insurance  funding  agreement  ("IFA") is an
agreement that requires a Portfolio to make cash contributions to a deposit fund
of an insurance  company's  general account.  The insurance company then credits
interest to the Portfolio for a set time period.

         Investment  strategy.  The Diversified  Assets  Portfolio may invest in
         IFAs  issued by  insurance  companies  that  meet  quality  and  credit
         standards established by the Investment Adviser.

         Special risks.  IFAs are not insured by a government  agency--they  are
         backed only by the  insurance  company that issues  them.  As a result,
         they are subject to default  risk.  In  addition,  an active  secondary
         market in IFAs does not  currently  exist.  This  means  that it may be
         difficult to sell an IFA at an appropriate price.

Investment  Companies.  In  connection  with the  management of their daily cash
positions, the Portfolios may invest in shares of other money market funds which
invest in short-term,  high quality debt  securities  and  securities  issued by
other  investment  companies  consistent  with their  investment  objectives and
policies.

             Investment  strategy.  Investments  by a  Portfolio  in other money
             market funds will be subject to the  limitations  of the Investment
             Company Act of 1940.  [Although the  Portfolios do not expect to do
             so in the  foreseeable  future,  each  Portfolio is  authorized  to
             invest  substantially  all of its assets in an open-end  investment
             company  that  has the  same  investment  objective,  policies  and
             fundamental restrictions as the Portfolio.]

             Special risks. As a shareholder of another  investment  company,  a
             Portfolio  would be subject to the same risks as any other investor
             in that company.  It would also bear a  proportionate  share of any
             fees or expenses paid by that company.  These  expenses would be in
             addition to the  advisory  fees and other  expenses  the  Portfolio
             bears directly in connection with its own operations.

Municipal  and  Related   Instruments.   Municipal   instruments   include  debt
obligations issued by or on behalf of states, territories and possessions of the
United  States  and their  political  subdivisions,  agencies,  authorities  and
instrumentalities.


Municipal  instruments  include both  "general" and  "revenue"  bonds and may be
issued to obtain funds for various  public  purposes.  General  obligations  are
secured by the  issuer's  pledge of its full  faith,  credit  and taxing  power.
Revenue obligations are payable only from the revenues derived from a particular
facility or class of facilities.  In some cases,  revenue bonds are also payable
from the proceeds of a special excise or other  specific  revenue source such as
lease  payments from the user of a facility being  financed.  Some municipal
instruments, known as private activity bonds, are issued to finance projects for
private companies.  Private activity bonds are usually revenue obligations since
they are typically payable by the private user of the facilities financed by the
bonds. Municipal  instruments  also include "moral  obligation"  bonds,
municipal leases,  certificates of participation and custodial  receipts.  Moral
obligation  bonds are supported by a moral commitment but not a legal obligation
of a state or  municipality.  Municipal  leases and  participation  certificates
present the risk that the state or  municipality  involved will not  appropriate
the monies to meet  scheduled  payments on an annual basis.  Custodial  receipts
represent interests in municipal instruments held by a trustee.

During extraordinary  circumstances,  the Tax-Exempt Portfolio may invest in AMT
obligations  such as certain  bonds  issued to obtain  funds to provide  certain
water, sewage and solid waste facilities, qualified residential rental projects,
certain local electric,  gas and other heating or cooling facilities,  qualified
hazardous waste facilities, and government-owned airports, docks and wharves and
mass  commuting  facilities;   certain  qualified  mortgage,  student  loan  and
redevelopment  bonds;  and certain  bonds  issued as part of "small  issues" for
industrial facilities.

The  Municipal  Portfolio  may acquire  "stand-by  commitments"  relating to the
municipal instruments it holds. Under a stand-by commitment,  a dealer agrees to
purchase,  at the  Portfolio's  option,  specified  municipal  instruments  at a
specified price. A stand-by commitment may increase the cost, and thereby reduce
the yield,  of the municipal  instruments to which the commitment  relates.  The
Municipal  Portfolio  will acquire  stand-by  commitments  solely to  facilitate
portfolio  liquidity  and does not intend to exercise  their  rights for trading
purposes.

             Investment  strategy.  [Although it is not each Portfolio's current
             policy  to  do so on a  regular  basis,]  in  connection  with  its
             investments in municipal instruments,  the Tax-Exempt and Municipal
             Portfolios  may each  invest  more than 25% of its total  assets in
             municipal  instruments  the interest upon which is paid solely from
             revenues of similar  projects.  The  Tax-Exempt  Portfolio may also
             invest more than 25% of its total assets in industrial  development
             obligations or municipal  instruments whose issuers are in the same
             state. However, neither the Tax-Exempt nor the Municipal Portfolios
             intends to invest more than 25% of the value of its total assets in
             industrial  development  bonds or  similar  obligations  where  the
             non-governmental  entities supplying the revenues to be paid are in
             the same industry.

             The  Diversified  Assets  Portfolio  may invest up to 5% of its net
             assets in municipal instruments or other securities issued by state
             and local governmental bodies.  Generally, this will occur when the
             yield of municipal  instruments,  on a pre-tax basis, is comparable
             to  that  of  other  permitted   short-term  taxable   investments.
             Dividends  paid  by  the  Diversified   Assets  Portfolio  on  such
             investments will be taxable to shareholders.

         Special risks.  Municipal  instruments  purchased by the Tax-Exempt and
         Municipal  Portfolios may be backed by letters of credit,  insurance or
         other  forms  of  credit  enhancement  issued  by  foreign  (as well as
         domestic) banks, insurance companies and other financial  institutions.
         If the  credit  quality  of  these  banks  and  financial  institutions
         declines,  a  Portfolio  could  suffer  a loss to the  extent  that the
         Portfolio is relying upon this credit support. Foreign institutions can
         present special risks relating to higher transaction and custody costs,
         the  imposition  of  additional  taxes  by  foreign  governments,  less
         complete  financial  information,  less market  liquidity,  more market
         volatility  and  political   instability.   Foreign  banks,   insurance
         companies and financial  institutions  may be subject to less stringent
         reserve  requirements,  and  to  different  accounting,   auditing  and
         recordkeeping requirements than U.S banks.

         In  addition,  when a substantial  portion of a  Portfolio's  assets is
             invested  in  instruments  which  are  used to  finance  facilities
             involving  a  particular  industry,  whose  issuers are in the same
             state or which are otherwise  related,  there is a possibility that
             an  economic,  business  or  political  development  affecting  one
             instrument would likewise affect the related instrument.

Repurchase Agreements.  Repurchase agreements involve the purchase of securities
by a  Portfolio  subject  to the  seller's  agreement  to  repurchase  them at a
mutually agreed upon date and price.

         Investment   strategy.   Each  Portfolio  may  enter  into   repurchase
         agreements with financial institutions such as banks and broker-dealers
         that are deemed to be creditworthy by the Investment Adviser.  Although
         the securities  subject to a repurchase  agreement may have  maturities
         exceeding one year,  settlement of the agreement  will never occur more
         than one year after a Portfolio acquires the securities.

         Special  risks.  In the event of a default,  a Portfolio  will suffer a
         loss to the extent that the  proceeds  from the sale of the  underlying
         securities and other  collateral are less than the repurchase price and
         the  Portfolio's  costs  associated  with delay and  enforcement of the
         repurchase  agreement.  In  addition,  in the  event of  bankruptcy,  a
         Portfolio   could  suffer  losses  if  a  court   determines  that  the
         Portfolio's interest in the collateral is not enforceable.

Securities  Lending.  In order to generate additional income, the Portfolios may
lend  securities  on a short-term  basis to banks,  brokers and dealers or other
qualified  institutions.  In exchange,  the Portfolios  will receive  collateral
equal to at least 100% of the value of the securities loaned.

         Investment  strategy.  Securities  lending may  represent  no more than
         one-third the value of a Portfolio's  total assets  (including the loan
         collateral).  Any cash collateral received by a Portfolio in connection
         with these  loans may be  invested in U.S.  government  securities  and
         other liquid high-grade debt obligations.

         Special risks. The main risk when lending portfolio  securities is that
         the borrower  might become  insolvent or refuse to honor its obligation
         to return the securities.  In this event, a Portfolio could  experience
         delays in recovering  its  securities  and may possibly incur a capital
         loss. In addition, a Portfolio may incur a loss in reinvesting the cash
         collateral it receives.

     Stripped  Obligations.  These securities are issued by the U.S.  government
(or agency or instrumentality), foreign governments or banks and other financial
institutions.  They entitle the holder to receive  either  interest  payments or
principal  payments  that have been  "stripped"  from a debt  obligation.  These
obligations include stripped  mortgage-backed  securities,  which are derivative
multi-class mortgage securities.

     Investment   strategy.   Each  of  the  Portfolios  may  purchase  stripped
securities.

         Special risks.  Stripped securities are very sensitive to interest rate
         changes and to the rate of principal prepayments. A rapid or unexpected
         increase in mortgage  prepayments  could severely  depress the price of
         certain  stripped  mortgage-backed  securities and adversely affect the
         Portfolios' total returns.

United States Government  Obligations.  These include U.S. Treasury obligations,
such as bills,  notes and bonds,  which generally  differ only in terms of their
interest rates, maturities and time of issuance.  These also include obligations
issued   or   guaranteed   by  the  U.S.   government   or  its   agencies   and
instrumentalities.  Securities  guaranteed  as to principal  and interest by the
U.S.  government,  its agencies or  instrumentalities  are deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of  credit  issued  by the U.S.  government  or an agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         Investment  strategy.  To the  extent  consistent  with its  investment
         objective,  each  Portfolio  may invest in a variety  of U.S.  Treasury
         obligations and obligations issued or guaranteed by the U.S. government
         or its agencies and instrumentalities.


         Special  risks.  Not all U.S.  government  obligations  carry  the same
         guarantees.  Some,  such as those of the Government  National  Mortgage
         Association ("GNMA"), are supported by the full faith and credit of the
         United States Treasury. Other obligations, such as those of the Federal
         Home Loan  Banks,  are  supported  by the right of the issuer to borrow
         from the United States  Treasury;  and others,  such as those issued by
         the Federal National Mortgage  Association  ("FNMA"),  are supported by
         the  discretionary  authority  of the U.S.  government  to purchase the
         agency's obligations.  Still others are supported only by the credit of
         the instrumentality. No assurance can be given that the U.S. government
         would provide financial support to its agencies or instrumentalities if
         it is not obligated to do so by law.  There is no assurance  that these
         commitments  will be  undertaken  or complied  with in the  future.  In
         addition, the secondary market for certain participations in loans made
         to foreign governments or their agencies may be limited.

     Taxable  Investments.  Taxable investments include U.S.  dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and related  custodial  receipts;  and repurchase  agreements
relating to the above instruments.

         Investment  strategy.  The Tax-Exempt and Municipal Portfolios may each
         invest  from  time to  time,  on a  temporary  basis  or for  temporary
         defensive   purposes,   in  short-term  taxable  instruments  that  are
         "Eligible Securities" as defined by the SEC for money market funds.

         Special   risks.   Dividends  paid  by  the  Tax-Exempt  and  Municipal
         Portfolios  that are derived from interest paid on taxable  investments
         will generally be taxable to each Portfolio's  shareholders as ordinary
         income for Federal  income tax purposes.  The  Tax-Exempt and Municipal
         Portfolios  each may not  achieve  its  investment  objective  when its
         assets are invested in taxable obligations.

Variable and Floating Rate  Instruments.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at a margin  above a  generally  recognized  index  rate.  These
instruments  include  long-term  variable  and  floating  rate bonds  (sometimes
referred to as "Put  Bonds")  where a Portfolio  obtains at the time of purchase
the  right  to put the  bond  back to the  issuer  or a third  party at par at a
specified date.

             Investment strategy. Each Portfolio may invest in rated and unrated
             variable and floating  rate  instruments  to the extent  consistent
             with its investment objective. Unrated instruments may be purchased
             by a Portfolio if they are determined by the Investment  Adviser to
             be of comparable quality to rated instruments eligible for purchase
             by the  Portfolio.  The  Portfolios  may invest in variable  amount
             master demand notes.

             Special risks.  Variable and floating rate  instruments are subject
             to  the  same  risks  as  fixed  income  investments,  particularly
             interest rate and credit risk. Because there is no active secondary
             market for certain variable and floating rate instruments, they may
             be more  difficult  to sell if the issuer  defaults  on its payment
             obligations  or during periods when the Portfolios are not entitled
             to exercise their demand rights. As a result,  the Portfolios could
             suffer a loss with respect to these instruments.

When-Issued Securities, Delayed Delivery Transactions and Forward Commitments. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

         Investment strategy.  Each Portfolio may purchase or sell securities on
         a when-issued,  delayed delivery or forward commitment basis.  Although
         the   Portfolios   would   generally   purchase   securities  in  these
         transactions  with the  intention  of  acquiring  the  securities,  the
         Portfolios  may dispose of such  securities  prior to settlement if the
         investment management team deems it appropriate to do so.

         Special risks. Purchasing securities on a when-issued, delayed delivery
         or forward  commitment  basis involves the risk that the securities may
         decrease in value by the time they are  actually  issued or  delivered.
         Conversely,  selling securities in these transactions involves the risk
         that the value of the securities may increase  before the time they are
         actually issued or delivered.  These transactions also involve the risk
         that  the  seller  may  fail to  deliver  the  security  or cash on the
         settlement date.



<PAGE>


42

                                    APPENDIX


                         PORTFOLIO FINANCIAL HIGHLIGHTS

The  financial   highlights  tables  are  intended  to  help  you  understand  a
Portfolio's   financial   performance  for  the  [period  of  each   Portfolio's
operations]. Certain information reflects financial results for a single Service
Share. The total returns in the tables represent the rate that an investor would
have earned or lost on an investment in a Portfolio  (assuming  reinvestment  of
all  dividends and  distributions).  This  information  has been audited by [ ],
whose  report is  included  in the  Portfolios'  annual  report  along  with the
Portfolios'  financial  statements.  The annual report and semiannual report are
available  upon request and without  charge.  As of November  30, 1999,  Service
Shares of the Municipal Portfolio had not been issued to the public.


Financial Highlights




<PAGE>


22




For More Information

Annual/Semiannual Report

Additional  information  about the  Portfolios'  investments is available in the
Portfolios' annual and semiannual reports to shareholders.

Statement of Additional Information

Additional information about the Portfolios and their policies is also available
in the  Portfolios'  Statement of  Additional  Information  ("SAI").  The SAI is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The  Portfolios'  annual and  semiannual  reports and the SAI are available free
upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:
By telephone - Call 1-800-637-1380
By mail - Northern Institutional Funds
                P.O. Box 75943
                Chicago, IL  60675
On the Internet - Text-only versions of the Portfolios'  documents are available
on the SEC's website at http://www.sec.gov
You may review and obtain copies of Trust documents by visiting the SEC's Public
Reference Room in Washington, D.C. You may also obtain copies of Trust documents
by sending your  request and a  duplicating  fee to the SEC's  Public  Reference
Section,   Washington,   D.C.   20549-0102   or   by   electronic   request   at
[email protected].  Information  on the operation of the Public  Reference Room
may be obtained by calling the SEC at 1-202-942-8090.



[LOGO]

811-3605



<PAGE>







Northern Institutional Funds
Money Market Portfolios
Premier Shares

      Government Select Portfolio
      Government Portfolio
      Diversified Assets Portfolio
      Tax-Exempt Portfolio
      Municipal Portfolio


Prospectus dated April 1, 2000





An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.

The  Securities and Exchange  Commission  has not approved or disapproved  these
securities or passed upon the adequacy of this Prospectus. Any representation to
the contrary is a criminal offense.






<PAGE>


<TABLE>
<CAPTION>
<S>                                                    <C>                                                 <C>     <C>

Contents

                                                                                                                   Page
- ------------------------------------------------------ ------------------------------------------------------------------
Risk/Return Summary                                    Portfolios
Information about the objectives, principal            o    Government Select Portfolio                               X
strategies and risk characteristics of each Portfolio  o    Government Portfolio                             X
                                                       o    Diversified Assets Portfolio                              X
                                                       o    Tax-Exempt Portfolio                             X
                                                       o    Municipal Portfolio
                                                                          X



                                                       Principal Investment Strategies and    Risks          X

                                                       Portfolio Performance                                          X
                                                       o    Government Select Portfolio                               X
                                                       o    Government Portfolio                             X
                                                       o    Diversified Assets Portfolio                              X
Management of the Portfolios                           o    Tax-Exempt Portfolio                             X
Details that apply to the Portfolios as a group        o    Municipal Portfolio
                                                                          X


                                                       Portfolio Fees and Expenses                                    X

                                                       Investment Adviser                                             X
                                                       Advisory Fees
                                                                                       X
                                                       Portfolio Management                                           X
                                                       Other Portfolio Services                              X

About Your Account                                     Purchasing and Selling Premier Shares                 X
How to open, maintain and close an account             o    Investors                                                 X
                                                       o    Share Classes                                    X
                                                       o    Opening an Account
                                                                                                              X
                                                       o    Selling Premier Shares                           X

                                                       Account Policies and Other Information                X
                                                       o    Automatic Investment Arrangements                         X
                                                       o    Purchase and Redemption Minimums                 X
                                                       o    Calculating Share Price                                   X
                                                       o    Timing of Purchase Requests                      X
                                                       o    Tax Identification Number                                 X
                                                       o    In-Kind Purchases and Redemptions                         X
                                                       o    Miscellaneous Purchase Information                        X
                                                       o    Timing of Redemption and Exchange Requests       X
                                                       o    Miscellaneous Redemption Information             X
                                                       o    Exchange Privileges                                       X
                                                       o    Telephone Transactions                           X
                                                       o    Advance Notification of Large Transactions                X
                                                       o    Making Changes to Your Account Information       X
                                                       o    Business Day                                     X
                                                       o    Early Closings                                            X
                                                       o    Authorized Intermediaries                                 X
                                                       o    Servicing Agents                                          X


                                                       Distributions and Taxes                               X
                                                       o    Distributions                                    X
                                                       o    Taxes                                                     X
                                                       o    Other Tax Information                            X

                                                       Year 2000
                                                       Issues
                                                       X

Risks, Securities and Techniques                       Risks, Securities and
                                                                        Techniques                                  X

Appendix                                               Portfolio Financial Highlights
                                                                                                                     X

For More Information                                   Annual/Semiannual Reports                                      X
                                                       Statement of Additional Information                            X
- ------------------------------------------------------ ------------------------------------------------------------------


</TABLE>



<PAGE>




Northern  Institutional  Funds (the  "Trust")  offers  five  money market
portfolios  (each a "Portfolio") to institutional  investors.  Each Portfolio is
authorized to offer three classes of shares:  Shares, Service Shares and Premier
Shares. Shares and Service Shares are described in separate prospectuses.



The  descriptions  on the following pages may help you choose the Portfolio that
best fits your investment  needs. Keep in mind,  however,  that no Portfolio can
guarantee  it will meet its  investment  objective  and no  Portfolio  should be
relied upon as a complete investment program.  The Trust's six fixed income, one
balanced  and  nine   equity  portfolios  are  described  in  a  separate
prospectus.

     The  Portfolios  seek to  maintain  a stable  net asset  value of $1.00 per
share. Consistent with this policy, each of the Portfolios:

     Limits its  dollar-weighted  average portfolio maturity to 90 days or less;
Buys  securities  with  remaining  maturities  of 397 days or less  (except  for
certain  variable and floating rate  instruments and securities  collateralizing
repurchase agreements);  and Invests only in U.S. dollar-denominated  securities
that represent minimal credit risks.

In addition,  each Portfolio limits its investments to "Eligible  Securities" as
defined by the Securities and Exchange Commission  ("SEC").  Eligible Securities
include,  generally,  securities that either (a) have short-term debt ratings at
the time of purchase in the two highest  rating  categories or (b) are issued or
guaranteed by, or otherwise  allow a Portfolio to demand payment from, an issuer
with those ratings. Securities that are unrated (including securities of issuers
that have  long-term  but not  short-term  ratings) may be deemed to be Eligible
Securities  if  determined  to be of  comparable  quality by The Northern  Trust
Company under the direction of the Board of Trustees. Securities that are in the
highest  short-term  rating  category (and  comparable  unrated  securities) are
called  "First Tier  Securities."  Under normal  circumstances,  the  Government
Select,  Government and Diversified  Assets Portfolios intend to limit purchases
of securities to First Tier  Securities.  Securities in which the Portfolios may
invest  may not earn as high a level of income  as  long-term  or lower  quality
securities,  which  generally have greater  market risk and more  fluctuation in
market value.

In addition to the  instruments  described  above and on the pages  below,  each
Portfolio  may use  various  investment  techniques  in seeking  its  investment
objective.  You can learn more  about  these  techniques  and  related  risks by
reading  "Risks,  Securities  and  Techniques"  beginning  on page  [XX] of this
Prospectus and the Statement of Additional Information.




<PAGE>


Government Select Portfolio

Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.


Principal Investment Strategies and Risks

Investment Strategies
The Portfolio seeks its objective by investing  exclusively in securities issued
or guaranteed as to principal and interest by the U.S. government,  its agencies
or instrumentalities. Under normal market conditions, the Portfolio will seek to
acquire  only  those  U.S.  government  securities  the  interest  upon which is
generally   exempt  from  state  income  taxation.   These  securities   include
obligations issued by the U.S. Treasury and certain U.S. government agencies and
instrumentalities,  such as the  Federal  Home  Loan Bank and the  Federal  Farm
Credit Banks Funding Corp.

When  appropriate  securities which are exempt from state taxes are unavailable,
the Portfolio may also invest in non-exempt U.S. government  securities and cash
equivalents  including  money market funds and time  deposits with a maturity of
three months or less, and hold uninvested cash.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk, prepayment (or call) risk, debt extension risk, Government securities
risk,  guarantor (or credit enhancement) risk,  management risk, liquidity risk,
and Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.



<PAGE>



Government Portfolio


Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.


Principal Investment Strategies and Risks

Investment Strategies

The  Government  Portfolio  seeks its  objective  by  investing  exclusively  in
marketable  securities  issued or guaranteed as to principal and interest by the
U.S. government,  its agencies or  instrumentalities,  and repurchase agreements
backed  by such  securities.  The  Portfolio  may also hold  custodial  receipts
representing  interests in U.S. government  securities.   Risks These primary
investment  risks apply to the Portfolio:  stable NAV risk,  interest rate risk,
prepayment (or call) risk,  debt extension  risk,  Government  securities  risk,
guarantor (or credit  enhancement)  risk,  management risk,  liquidity risk, and
Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.




<PAGE>



Diversified Assets Portfolio

Investment Objective

The Portfolio seeks to maximize current income to the extent consistent with the
preservation of capital and maintenance of liquidity by investing exclusively in
high quality money market instruments.

Principal Investment Strategies and Risks

     Investment  Strategies The Diversified Assets Portfolio seeks its objective
by investing in a broad range of  government,  bank and  commercial  obligations
that are available in the money markets, including:

     U.S.  dollar-denominated  obligations  of U.S.  banks with total  assets in
excess of $1 billion (including obligations of foreign branches of such banks);

     U.S. dollar-denominated  obligations of foreign commercial banks where such
banks have total assets in excess of $5 billion;

     High quality commercial paper and other obligations issued or guaranteed by
U.S. and foreign corporations and other issuers;

     Corporate  bonds,  notes,  paper  and  other  instruments  that are of high
quality;

          Asset-backed securities;

     Securities  issued or  guaranteed  as to principal and interest by the U.S.
government or by its agencies or  instrumentalities  and custodial receipts with
respect thereto;

     U.S.  dollar-denominated  securities  issued or  guaranteed  by one or more
foreign governments or political subdivisions, agencies or instrumentalities;

          Repurchase agreements relating to the above instruments; and

     Municipal  securities  issued or guaranteed by state or local  governmental
bodies.

Risks
These primary investment risks apply to the Portfolio: stable NAV risk, interest
rate risk,  credit (or default) risk,  guarantor (or credit  enhancement)  risk,
management risk, liquidity risk,  prepayment (or call) risk, debt extension risk
and Year 2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.






<PAGE>



Tax-Exempt Portfolio

Investment Objective

The Portfolio seeks to provide its  shareholders,  to the extent consistent with
the  preservation  of capital and prescribed  portfolio  standards,  with a high
level of income  exempt  from  Federal  income  tax by  investing  primarily  in
municipal instruments.


Principal Investment Strategies and Risks

Investment Strategies
The  Portfolio  seeks  to  achieve  its  objective  by  investing  primarily  in
high-quality  short-term  instruments,  the  interest  on which is  exempt  from
Federal income tax ("municipal instruments"). These may include:

          Fixed and variable rate notes and similar debt instruments;

          Tax-exempt commercial paper;

     Rated and unrated municipal bonds, notes, paper or other instruments; and

     Municipal bonds and notes which are guaranteed as to principal and interest
or backed by the U.S. government or its agencies or instrumentalities.

Under normal market conditions,  at least 80% of the Portfolio's net assets will
be invested in municipal  instruments.  Interest  earned by the Portfolio on AMT
obligations  ("private  activity bonds") the interest on which may be treated as
an item of tax preference to shareholders under the Federal  alternative minimum
tax, will not be deemed to have been derived from municipal  instruments for the
purposes  of  determining   whether  the  Portfolio   meets  this  policy.   For
shareholders subject to AMT, a limited portion of the Portfolio's  dividends may
be subject to Federal tax.

During extraordinary circumstances,  however, the Portfolio may take a temporary
defensive  posture and hold  uninvested  cash or invest in AMT  obligations  and
taxable short-term securities without limitation.


Taxable  investments will consist  exclusively of those  instruments that may be
purchased by the Diversified Assets Portfolio including U.S.  dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and custodial  receipts with respect thereto;  and repurchase
agreements relating to the above instruments.  Risks These primary investment
risks apply to the Portfolio:  stable NAV risk,  interest rate risk,  credit (or
default)  risk,  guarantor  (or  credit  enhancement)  risk,   management  risk,
liquidity   risk,    prepayment   (or   call)   risk,   debt   extension   risk,
project/industrial development bond risk, tax risk and Year 2000 risk. These and
other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.




<PAGE>


Municipal Portfolio

Investment Objective

The Portfolio seeks to provide,  to the extent  consistent with the preservation
of capital,  a high level of income  exempt from regular  Federal  income tax by
investing  primarily in municipal  instruments.  This  objective  may be changed
without shareholder approval.

Principal Investment Strategies and Risks

Investment Strategies
The  Portfolio  seeks  to  achieve  its  objective  by  investing  primarily  in
high-quality  short-term municipal instruments.  The high level of income sought
by the  Portfolio is relative to yields  currently  available in the  tax-exempt
market place. Municipal instruments are debt instruments,  the interest on which
is exempt from regular Federal income tax. These may include:

          Fixed, variable and floating rate notes and bonds;

          Asset-backed securities;

          Tax-exempt commercial paper;

          Municipal bonds, notes, paper or other instruments; and

     Muncipal  bonds and notes which are guaranteed as to principal and interest
or backed by the U.S. government or its agencies or instrumentalities.

Under normal  circumstances,  at least 80% of the Portfolio's net assets will be
invested in municipal instruments. Subject to this limitation, the Portfolio may
hold  uninvested  cash and  invest  in  taxable  instruments.  During  temporary
defensive periods,  however, all or any portion of the Portfolio's assets may be
held uninvested or invested in taxable instruments.

The Portfolio is not limited in the amount of its assets that may be invested in
AMT obligations  ("private activity bonds") the interest on which may be treated
as an item of tax  preference  to  shareholders  under the  Federal  alternative
minimum  tax.  For  shareholders  subject to AMT, a  significant  portion of the
Portfolio's  dividends  may be subject to Federal  tax. The  Portfolio  does not
currently intend to invest in AMT obligations.  The Portfolio retains,  however,
the ability to invest any or all of its assets in AMT obligations, and may do so
in the future.


Taxable investments will normally consist of U.S. dollar-denominated obligations
of U.S. banks,  foreign  commercial banks and securities issued or guaranteed by
foreign  governments;  high quality commercial paper;  other  obligations,  high
quality  corporate bonds and notes;  securities issued or guaranteed by the U.S.
government,  its  agencies or  instrumentalities  and  custodial  receipts  with
respect thereto;  and repurchase  agreements  relating to the above instruments.
Risks These  primary  investment  risks apply to the  Portfolio:  stable NAV
risk,  interest  rate  risk,  credit (or  default)  risk,  guarantor  (or credit
enhancement) risk,  management risk, liquidity risk,  prepayment (or call) risk,
debt extension risk, project/industrial development bond risk, tax risk and Year
2000 risk. These and other risks are summarized below.


More  information  on the  Portfolio's  investment  strategies and techniques is
provided in "Risks,  Securities and  Techniques"  beginning on page [XX] of this
Prospectus.



<PAGE>


Principal Investment Risks

All  investments  carry some  degree of risk  which  will  affect the value of a
Portfolio's  investments,  investment  performance,  yield  and the price of its
shares.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.

The following summarizes the principal risks that may affect the Portfolios.


Risks that apply to ALL Portfolios:


Stable  NAV  risk is the risk that a Portfolio  will not be able to
maintain a net asset value per share of $1.00 at all times.

      Interest  rate risk is the risk that  during  periods  of rising  interest
     rates, a Portfolio's  yield (and the market value of its  securities)  will
     tend to be lower  than  prevailing  market  rates;  in  periods  of falling
     interest  rates,  a  Portfolio's   yield  (and  the  market  value  of  its
     securities) will tend to be higher.


Guarantor  (or  Credit  enhancement)  risk is the risk that  changes in
     credit  quality  of a U.S.  or  foreign  bank,  insurance  company or other
     financial  institution could cause a Portfolio's  investments in securities
     backed by letters  of credit or other  credit  enhancements  issued by such
     bank or institution to decline in value.

      Management  risk  is the  risk  that a  strategy  used  by the  investment
management team may fail to produce the intended results.

      Liquidity  risk  is the  risk  that a  Portfolio  will  not be able to pay
     redemption  proceeds on the same  Business  Day that  shares are  redeemed,
     because  of  unusual  market  conditions,   an  unusually  high  volume  of
     redemption requests or other reasons.

     Year 2000 risk is the risk that a  Portfolio's  operations or value will be
adversely affected by the "Year 2000 Problem." (For more information, please see
"Year 2000 Issues" on page [xx]).

Risk that applies primarily to the Government Select and Government Portfolios:

     Government  securities  risk is the risk that the U.S.  government will not
provide  financial support to U.S.  government  agencies,  instrumentalities  or
sponsored enterprises if it is not obligated to do so by law.


     Risks  that apply  primarily  to the  Diversified  Assets,  Tax-Exempt  and
Municipal Portfolios:

      Credit  (or  Default)  risk is the risk  that an  issuer  of fixed  income
     securities  held by the  Portfolio  may  default on its  obligation  to pay
     interest and repay principal.  Generally,  the lower the credit rating of a
     security, the greater the risk that the issuer of the security will default
     on its obligation.  High quality  securities are generally believed to have
     relatively low degrees of credit risk.

      Prepayment  (or Call) risk is the risk that an issuer  will  exercise  its
     right to pay  principal on an  obligation  held by a Portfolio  (such as an
     asset-backed  security)  earlier than  expected.  This may happen  during a
     period of declining interest rates. Under these circumstances,  a Portfolio
     may be unable to recoup all of its initial  investment and will suffer from
     having  to  reinvest  in lower  yielding  securities.  The  loss of  higher
     yielding securities and the reinvestment at lower interest rates can reduce
     a Portfolio's income.

      Debt  extension risk is the risk that an issuer will exercise its right to
     pay  principal  on  an  obligation  held  by  the  Portfolio  (such  as  an
     asset-backed security) later than expected. This may happen during a period
     of rising  interest  rates.  Under  these  circumstances,  the value of the
     obligation  will decrease and a Portfolio will suffer from the inability to
     invest in higher yielding securities.


Risks that apply to the Tax-Exempt and Municipal Portfolios:

      Project/industrial  development bond risk is the risk that a Portfolio may
     be more sensitive to an adverse economic, business or political development
     if it invests  more than 25% of its  assets in  municipal  instruments  the
     interest upon which is paid solely from revenues of similar projects, or in
     industrial development bonds.

      Tax risk is the risk that future legislative or administrative  changes or
court  decisions  may  materially  affect the  ability of the  Portfolio  to pay
tax-exempt dividends.

More  information  about the risks of investing in the Portfolios is provided in
"Risks,  Securities and Techniques" beginning on page [XX]. You should carefully
consider the risks discussed in these sections before investing in a Portfolio.

Portfolio Performance

The bar charts and tables  that  follow  provide an  indication  of the risks of
investing  in a  Portfolio.  The bar charts and tables  assume  reinvestment  of
dividends and  distributions.  A Portfolio's past performance is not necessarily
an  indication  of how the  Portfolio  will  perform in the future.  Performance
reflects  certain  expense  limitations  (as set forth in the  Footnotes  to the
"Portfolio  Fees and Expenses" table on page [ ]) that were in effect during the
periods  presented.  If expense  limitations  were not in place,  a  Portfolio's
performance would have been reduced. The bar charts and tables have been omitted
for the Municipal Portfolio because the Portfolio has been in operation for less
than one calendar year.

Premier Shares of the  Diversified  Assets and Tax-Exempt  Portfolios  have less
than  one  calendar  year's  performance.   For  this  reason,  the  performance
information  shown below is for  another  class of shares  (Shares)  that is not
offered in this  Prospectus  because  both  Service  Shares  and Shares  will be
invested in the same  portfolio of  securities.  In reviewing  this  performance
information,  however,  you should be aware  that  Premier  Shares  have a 0.58%
(annualized)  Service Fee and a 0.02%  (annualized)  Transfer  Agency fee, while
Shares have neither of these fees.  If the  expenses of the Premier  Shares were
reflected, performance would be substantially lower.




<PAGE>



Government Select Portfolio

[Bar Chart]

Calendar Year Total Return


1999:[ XXX]%

Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[XX]                [  ]%
Worst Quarter Return:               Q[ ] `[XX]                [  ]%

Average Annual Total Return (for the periods ended December 31, 1999)

                                                    Government Select Portfolio

1-Year        Since Inception ([  ])
[  ]%               [  ]%


The 7-day yield for Premier  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>



Government Portfolio


[Bar Chart]

Calendar Year Total Return


1999: [XXX]%

Best and Worst Quarterly Performance:

Best Quarter Return:                Q[ ] `[  ]                          [XXX]%
Worst Quarter Return:               Q[ ] `[  ]                          [XXX}%

Average Annual Total Return (for the periods ended December 31, 1999)

Government Portfolio

1-Year              Since Inception ([ ])

[  ]%                        [ ]%


The 7-day yield for Premier  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.





<PAGE>


Diversified Assets Portfolio


[Bar Chart]

Calendar Year Total Return (Shares)

                                               1989:         9.35%
                                               1990:         8.27%
                                               1991:         6.14%
                                               1992:         3.71%
                                               1993:         3.02%
                                               1994:         4.05%
                                               1995:         5.79%
                                               1996:         5.28%
                                               1997:         5.45%
                                               1998:         5.40%

                                               1999:         [XXX]%

Best and Worst Quarterly Performance (Shares)

Best Quarter:              Q[ ] `[  ]                                  +[  ]%
Worst Quarter:             Q[ ] `[  ]                                  +[  ]%


Average Annual Total Return (Shares) (for the periods ended December 31, 1999)

Diversified Assets Portfolio

1-Year        5-Year               10-Year         Since Inception (7/27/82)
[  ]%         [  ]%                  [ ]%                     [ ]%

The 7-day yield for Premier  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>



Tax-Exempt Portfolio


[Bar Chart]

Calendar Year Total Return (Shares)

                                               1989:         6.23%
                                               1990:         5.86%
                                               1991:         4.54%
                                               1992:         2.91%
                                               1993:         2.27%
                                               1994:         2.61%
                                               1995:         3.73%
                                               1996:         3.33%
                                               1997:         3.45%
                                               1998:         3.29%

                                               1999:         [XXX]%

Best and Worst Quarterly Performance (Shares):

Best Quarter:              Q[ ] `[  ]                                  +[  ]%
Worst Quarter:             Q[ ] `[  ]                                  +[  ]%

Average Annual Total Return (Shares) (for the periods ended December 31, 1999)

Government Portfolio

1-Year        5-Year             10-Year         Since Inception (8/12/83)
[  ]%         [  ]%               [ ]%                      [ ]%


The 7-day yield for Premier  Shares of the  Portfolio as of December 31, 1999: [
]%. You may call 1-800-637-1380 to obtain the current 7-day yield.




<PAGE>


Portfolio Fees and Expenses

This table  describes the fees and expenses that you may pay if you buy and hold
Premier  Shares of the  Portfolios.  Please  note that it does not  reflect  any
charges  which may be imposed by The Northern  Trust  Company,  its  affiliates,
correspondent  banks and other  institutions  on their  Customers (as defined on
page [ ]).  (For  more  information,  please  see  "Account  Policies  and Other
Information" on page [ ].)
<TABLE>
<CAPTION>
<S>                                                          <C>               <C>        <C>                <C>          <C>

                                                             Government Select Government Diversified Assets Tax -Exempt  Municipal

Shareholder Fees (fees paid directly from your investment)
    Sales Charge (Load) Imposed on Purchases.................. None            None       None                None         None
    Deferred Sales Charge (Load)                               None            None       None                None         None
    Sales Charge (Load) Imposed on Reinvested
        Distributions......................................... None            None       None                None         None
    Redemption Fees........................................... None            None       None                None         None
    Exchange Fees............................................. None            None       None                None         None

Annual Portfolio Operating Expenses (expenses that are
deducted
     from Portfolio assets) 1
    Management Fees2.......................................... 0.25%           0.25%      0.25%               0.25%        0.25%
    Distribution (12b-1) Fees................................. None            None       None                None         None
    Other Operating Expenses..................................
      Servicing Agent Fees....................................0.50%            0.50%      0.50%               0.50%        0.50%
      Transfer Agency Fees....................................0.02%            0.02%      0.02%               0.02%        0.02%
      Other Expenses3.........................................0.21%            0.21%      0.21%               0.22%        0.22%
    Total Other Operating Expenses............................0.73%            0.73%      0.73%               0.74%        0.74%

    Total Annual Portfolio Operating Expenses4................0.98%            0.98%      0.98%               0.99%        0.99%




</TABLE>











<PAGE>



- --------------------------------
         Footnotes

     1 The Municipal  Portfolio's  annual operating expenses are based on actual
fees and estimated expenses for the current fiscal year.

2        For the fiscal year ended November 30, 1999, The Northern Trust Company
         voluntarily  waived a portion of its management fees for the Government
         Select and Municipal Portfolios. As a result of the fee waivers, actual
         management fees paid by the Government Select and Municipal  Portfolios
         were 0.10% of each  Portfolio's  average daily net assets.  Fee waivers
         may be  terminated  at any time at the  option  of the  Northern  Trust
         Company.

3        "Other Expenses" include (1) administration or  co-administration  fees
         and all other ordinary  operating expenses of each Portfolio not listed
         above and (2) the payment of a fee to  Northern  or other  institutions
         under a  Service  Plan  equal to 0.08% of the  average  daily net asset
         value of the Premier shares for systems  support and related  services.
         For the fiscal  year ended  November  30,  1999,  Goldman,  Sachs & Co.
         ("Goldman  Sachs") was entitled to an  administration  fee at an annual
         rate of 0.10% of the average daily net assets of each Portfolio. During
         the  same  period,   Goldman  Sachs  reimbursed   expenses   (including
         administration fees, but excluding management and transfer agency fees,
         servicing fees and certain extraordinary expenses) which exceeded on an
         annualized basis 0.10% of each Portfolio's average daily net assets. As
         a result of the expense reimbursement,  actual other operating expenses
         paid by the  Government,  Government  Select,  Diversified  Assets  and
         Tax-Exempt  Portfolios were 0.10% of each Portfolio's average daily net
         assets.  On May 1, 1999,  The Northern Trust Company  ("Northern")  and
         PFPC Inc.,  formerly First Data Investor  Services Group, Inc. ("PFPC")
         replaced  Goldman Sachs as the Portfolios'  co-administrators,  and are
         entitled to a  co-administration  fee from the Portfolios at the annual
         rates set forth above. Under their Co-Administration Agreement with the
         Trust,  which  may  be  amended  without  shareholder   approval,   the
         co-administrators   have  agreed  indefinitely  to  reimburse  expenses
         (including fees payable to Northern and PFPC as co-administrators,  but
         excluding  management  fees,  transfer agency fees,  servicing fees and
         extraordinary  expenses)  which exceed on an annualized  basis 0.10% of
         each Portfolio's  average daily net assets.  As a result of the expense
         reimbursement, "Other Expenses" are currently 0.18% of each Portfolio's
         average daily net assets.

4        As a result of the fee waivers and expense  reimbursements,  the actual
         management  fees,  distribution  (12b-1) fees, other expenses and total
         annual operating  expenses for each Portfolio for the fiscal year ended
         November 30, 1999 were as set forth below.  Fee waivers (and  voluntary
         expense reimbursements, if applicable) may be terminated at any time at
         the  option  of  Northern.  If this  occurs,  "Total  Annual  Portfolio
         Operating Expenses" may increase without shareholder approval.
<TABLE>
<CAPTION>
<S>                    <C>                   <C>                <C>                    <C>

Premier Shares                                                                         Total Annual
                       Management            Distribution                              Operating Expenses
                       Fees                  (12b-1) Fees        Other Expenses

Government Select      0.10%                 0.00%               0.70%                 0.80%
Government             0.25%                 0.00%               0.70%                 0.95%
Diversified Assets     0.25%                 0.00%               0.70%                 0.95%
Tax-Exempt             0.25%                 0.00%               0.70%                 0.95%
Municipal              0.10%                 0.00%               0.70%                 0.80%



</TABLE>





<PAGE>



Example

The  following  Example is intended to help you compare the cost of investing in
Premier Shares of a Portfolio  (without fee waivers and expense  reimbursements)
with the cost of investing in other mutual funds.

The Example  assumes that you invest $10,000 in a Portfolio for the time periods
indicated (with reinvestment of all dividends and distributions) and then redeem
all of your Premier Shares at the end of those periods. The Example also assumes
that your investment has a 5% return each year and that a Portfolio's  operating
expenses  remain the same.  Although  your actual  costs may be higher or lower,
based on these assumptions your costs would be:



<TABLE>
<CAPTION>
<S>                                                           <C>          <C>          <C>           <C>

Portfolio                                                     1 Year       3 Years      5 Years       10 Years

Government Select
     Premier Shares.....................................      $100           $312         $542       $1,201

Government
     Premier Shares.....................................      $100           $312         $542       $1,201

Diversified Assets
     Premier Shares.....................................      $100           $312         $542       $1,201

Tax-Exempt
     Premier Shares.....................................      $101           $315         $547       $1,213

Municipal
     Premier Shares.....................................      $101           $315         $547       $1,213




</TABLE>

<PAGE>


41



MANAGEMENT OF THE PORTFOLIOS

Investment Adviser

The Northern Trust Company ("Northern" or the "Investment Adviser"), an Illinois
state-chartered  bank and  member  of the  Federal  Reserve  System,  serves  as
investment  adviser for the Portfolios.  The Investment Adviser is located at 50
South LaSalle Street,  Chicago,  Illinois 60675 and is a wholly-owned subsidiary
of Northern Trust Corporation,  a bank holding company. As of December 31, 1999,
Northern Trust  Corporation and its subsidiaries had  approximately $[ ] billion
in assets, $[ ] billion in deposits and employed over [ ] persons.


Northern  has for more  than 100 years  managed  the  assets of  individuals,
charitable   organizations,   foundations  and  large  corporate  investors.
Northern and its affiliates  administrated in various  capacities  (including as
master trustee,  investment manager or custodian) approximately $[ ] trillion of
assets as of December 31, 1999,  including  approximately $[ ] billion of assets
for which Northern and its affiliates had investment management  responsibility.
Under its Advisory Agreement with the Trust, the Investment Adviser,  subject to
the general  supervision of the Trust's Board of Trustees,  is  responsible  for
making investment decisions for the Portfolios and for placing purchase and sale
orders for portfolio securities.


Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses,  the  Investment  Adviser  is  entitled  to an  advisory  fee from the
Portfolios, computed daily and payable monthly, at annual rates set forth in the
table below  (expressed as a percentage of each Portfolio's  respective  average
daily net assets).  The table also reflects the advisory  fees (after  voluntary
fee waivers) paid by the Portfolios as a percentage of net assets for the fiscal
year ended November 30, 1999.
<TABLE>
<CAPTION>
<S><C>                                                   <C>                       <C>

Portfolio                                                                         Advisory Fee Paid
                                                                                   For Fiscal Year
                                                          Contractual Rate          Ended 11/30/99
Government Select.................................             0.25%                    0.10%
Government........................................             0.25%                    0.25%
Diversified Assets................................             0.25%                    0.25%
Tax-Exempt........................................             0.25%                    0.25%
Municipal.........................................             0.25%                     N/A
</TABLE>

The difference,  if any,  between the  contractual  advisory fees and the actual
advisory fees paid by the Portfolios  reflects that the  Investment  Adviser did
not  charge  the full  amount of the  advisory  fees to which it would have been
entitled.  The  Investment  Adviser  may  discontinue  or modify  its  voluntary
limitations in the future at its discretion.

Portfolio Management

     The Investment Adviser employs a team approach to the investment management
of the Portfolios, relying upon investment professionals under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern.  Mr. Snyder  oversees the  management of all fixed income,  equity and
money  market  assets  managed by the  Investment  Adviser.  Mr.  Snyder  joined
Northern Trust in 1980.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer Agent") and custodian for each
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its  services in those  capacities  are  described in the
Statement of Additional Information.  In addition,  Northern and its affiliates,
banks,  trust companies and other  institutions and organizations may enter into
agreements for the provision of administrative  support services for the Premier
Share  investors.  Northern  and  other  institutions  may  provide  consulting,
technology  and  systems  support  services  and receive  fees  relating to cash
management  or sweep  account  services  under a Service  Plan  described  under
"Account Policies and Other Information - Servicing Agents" on page [ ].

     Northern and PFPC act as  co-administrators  for each  Portfolio.  The fees
that  Northern  and  PFPC  receive  for  their  co-administrative  services  are
described on page [ ] under "Portfolio Fees and Expenses."



                               ABOUT YOUR ACCOUNT

Purchasing and Selling Premier Shares

Investors

Institutional  investors,  which are  acting on their own behalf or on behalf of
their customers,  clients, employees,  participants and others ("Customers") and
enter into a servicing  agreement with the Trust  ("Servicing  Agreement"),  may
invest in the  Premier  Shares of each  Portfolio  through  their  institutional
accounts at Northern or an affiliate.  They may also establish accounts directly
with the Trust.  There is no sales charge imposed on investments.  Institutional
investors ("Institutions") include:


               Northern and its affiliates;
               Defined  contribution plans having at least $30 million in assets
               or  annual  contributions  of at  least  $5  million;  and  Other
               institutions and organizations.

Share Classes

     Each Portfolio offers three classes of shares:  Shares,  Service Shares and
Premier   Shares.   Shares  and  Service   Shares  are   described  in  separate
prospectuses.

      Shares do not provide for payments by the  Portfolio to  Institutions  for
administrative support or shareholder liaison services.

      Service Shares are designed for Institutions that agree with the Portfolio
     to  provide  (or  arrange  for the  provision  of)  administrative  support
     services to Customers.

      Premier Shares are designed for Institutions that agree with the Portfolio
     to provide (or arrange for the  provision  of)  administrative  support and
     shareholder liaison services to Customers.

Shares of each class bear their pro rata portion of all operating  expenses paid
by the Portfolio,  except  amounts  payable under the Service Plan that has been
adopted  for the  Portfolio's  Service  Shares and Premier  Shares and  transfer
agency fees.  The Service Plan  provides for payments at an annual rate of up to
0.58% of the average daily net asset value of Premier  Shares.  Because of these
class-specific  expenses, the performance of the Shares of a Portfolio described
in this  Prospectus  is expected to be higher than the  performance  of both the
Service Shares and Premier Shares of the same Portfolio and the performance of a
Portfolio's  Service Shares is expected to be higher than the performance of the
same Portfolio's Premier Shares.


<PAGE>



Opening an Account

You may purchase  Premier  Shares of each Portfolio  through your  institutional
account at Northern (or an affiliate)  or you may open an account  directly with
the  Trust  with a  minimum  initial  investment  of $5  million  in one or more
portfolios of the Trust. This minimum does not apply, however, to Premier Shares
purchased  through a  Northern  cash  sweep  program.  There is no  minimum  for
subsequent investments.


Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  Premier  Shares  through  your  account,  contact your
Northern representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase Premier Shares directly from the Trust as described in this Prospectus.


     By Mail.
               Read this Prospectus carefully. Complete and sign the new account
               application.
               Include a certified  corporate  resolution  (or other  acceptable
evidence of authority).
               Enclose a check or Federal  Reserve draft payable to the specific
              Portfolio. If investing in more than one Portfolio, please include
              a separate check for each.
               Mail your check,  corporate resolution and completed  application
to:
                  Northern Institutional Funds
                  c/o The Northern Trust Company
                  P.O. Box 75943
                  Chicago, Illinois 60675-5943

     All checks must be payable in U.S.  dollars and drawn on a bank  located in
the United States. Cash and third party checks are not acceptable.

     By Telephone.
               Read  this  Prospectus  carefully.  Call  the  Transfer  Agent at
               1-800-637-1380.
      To open a new account please provide:
                   The name of the  Portfolio  in which you'd like to invest The
                   number of Premier  Shares or dollar amount to be invested The
                   method of payment
      To add to an existing account, please provide:
                   The Institution's name
                   Your Account Number

     By Wire or Automated Clearing House Transfer ("ACH Transfer").
      To open a new account:
               Call the Transfer Agent at 1-800-637-1380  for  instructions.  To
      add to an existing account:
               Have your bank wire Federal funds or effect an ACH Transfer to:

                               The Northern Trust Company
                               Chicago, Illinois
                               ABA Routing No. 0710-00152
                               (Reference 10 Digit Portfolio Account No.)
                               (Reference Shareholder's Name)

For more  information  about the purchase of Premier  Shares,  call the Transfer
Agent at 1-800-637-1380.

Selling Premier Shares

Through an Institutional Account.  Institutions may sell (redeem) Premier Shares
through  their  institutional  account  by  contacting  their  Northern  account
representative.

Directly through the Trust.  Institutions  that purchase Premier Shares directly
from the Trust may redeem their Premier Shares through the Transfer Agent in one
of the following ways:

     By Mail.
      Send a written request to:
                       Northern Institutional Funds
                       c/o The Northern Trust Company
                       P.O. Box 75943
                       Chicago, Illinois 60675-5943.
      The letter of instruction must include:
                            The signature of a duly authorized person
                            Your account number
                            The name of the Portfolio
                            The number of Premier Shares or the dollar amount to
be redeemed.

     By Telephone.
                Call the Transfer Agent at 1-800-637-1380 for instructions.
                During periods of unusual economic or market activity, telephone
               redemptions  may  be  difficult  to  implement.  In  such  event,
               shareholders  should follow the  procedures  outlined above under
               "Selling Premier Shares By Mail."

     By Wire.
                Call the Transfer Agent at 1-800-637-1380 for instructions.  You
                must have given authorization for expedited wire redemption. The
                minimum amount that may be redeemed by this method is $10,000.


Account Policies and Other Information

Automatic  Investment  Arrangements.  Institutions  may purchase  Premier Shares
through their  institutional  accounts at Northern either by directing automatic
investment  of cash  balances  in excess of certain  agreed  upon  amounts or by
directing  investments from time to time on a non-automatic basis. Northern will
place a purchase order generated under an automatic  investment direction either
on the  Business  Day that  funds are  available  in the  account or on the next
Business Day, depending upon the terms of the automatic investment  arrangement.
Similarly,  Northern will place a redemption  order generated under an automatic
investment  direction  either  on  the  Business  Day  Northern  calculates  the
redemption  amount  needed to bring the  account  balance up to the agreed  upon
amount or on the next  Business Day,  depending  upon the terms of the automatic
investment  arrangement.  If a redemption  order is placed on the next  Business
Day,  Northern  will  normally  provide  funds by  provisionally  crediting  the
Institution's  account on the day the calculation is made.  Institutions  should
contact  Northern  for  more  information   about  their  automatic   investment
arrangements.  Purchase and Redemption Minimums.  There is a minimum initial
investment  of $5  million  in a  Portfolio  and  one or more  other  investment
portfolios of the Trust. This minimum does not apply, however, to Premier Shares
purchased  through a  Northern  cash  sweep  program.  There is no  minimum  for
subsequent  investments.  A $10,000 minimum applies for redemptions by wire. The
Trust  reserves  the right to waive  purchase  and  redemption  minimums  and to
determine the manner in which a minimum is satisfied.

Calculating  Share Price.  The Trust issues Premier  Shares and redeems  Premier
Shares at net asset value  ("NAV").  The NAV for each share class of a Portfolio
is  calculated  by dividing the value of net assets  attributed to that class by
the number of  outstanding  shares of the class.  The NAV for each Portfolio and
class is  calculated as of 3:00 p.m.,  Chicago time,  each Business Day. The NAV
used in determining the price of your Premier Shares is the one calculated after
your purchase, exchange or redemption order is received or accepted as described
below.

Each  Portfolio  seeks to  maintain  an NAV of $1.00  per share by  valuing  the
obligations  held by it at amortized  cost in accordance  with SEC  regulations.
Amortized cost will normally approximate market value.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 1:00 p.m., Chicago time, on any Business Day will be
executed the same day, provided that either:

                The Transfer  Agent  receives  the purchase  price in Federal or
               other  immediately  available  funds prior to 1:00 p.m.,  Chicago
               time, the same Business Day;
                The order is accepted by an authorized  intermediary and payment
               is to be made by the close of the same Business Day in Federal or
               other   immediately   available  funds  according  to  procedures
               authorized by the Trust; or
                Payment  in  Federal  or other  immediately  available  funds is
               received   by  the  close  of  the  same   Business   Day  in  an
               institutional account maintained with Northern or an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 1:00 p.m.,  Chicago  time,  on a Business Day will be
executed on the next Business Day, provided that payment is made as noted above.
We consider  requests  to be in "good  order" when all  required  documents  are
properly  completed,  signed  and  received,  including  a  certified  corporate
resolution or other acceptable evidence of authority. If an Institution pays for
Premier Shares by check,  Federal funds generally will become  available  within
two Business Days after a purchase order is received.

If payment is not received as described above from an authorized intermediary on
the same Business Day of acceptance of an order by the authorized  intermediary,
the  authorized  intermediary  may  be  liable  for  fees  and  losses  and  the
transaction may be cancelled.

In  certain  circumstances,  the Trust may  advance  the time by which  purchase
orders must be received. See "Early Closings" on page [ ].

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.

In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment  for  Premier  Shares  in the form of  securities  that are  permissible
investments  for  a  Portfolio.  The  Trust  also  reserves  the  right  to  pay
redemptions by a distribution  "in-kind" of securities  (instead of cash) from a
Portfolio.  See the Statement of Additional  Information for further information
about the terms of these purchases and redemptions.

Miscellaneous Purchase Information.

      Institutions  are  responsible  for  transmitting  purchase  orders to the
Transfer Agent and delivering required funds on a timely basis.
      Institutions are responsible for all losses and expenses of a Portfolio in
     the  event of any  failure  to make  payment  according  to the  procedures
     outlined in this Prospectus. Northern may redeem shares from any account it
     maintains to protect the Portfolios and Northern against loss. In addition,
     a $20 charge will be imposed if a check does not clear.
      Premier  Shares of a Portfolio are entitled to the  dividends  declared by
     the Portfolio beginning on the Business Day the purchase order is executed,
     provided  payment  in  Federal  or  other  immediately  available  funds is
     received by the Transfer Agent by the time designated above.
      The Trust reserves the right to reject any purchase order.  The Trust also
reserves the right to change or discontinue any of its purchase procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
will be effected at the NAV next  determined  after your  exchange or redemption
order is received in good order.  Good order means that the request includes the
following:  the account number and Portfolio name; the amount of the transaction
(as  specified in dollars or shares);  and the  signature  of a duly  authorized
person (except for telephone and wire  redemptions).  See "Account  Policies and
Other Information - Making Changes to Your Account Information."

If either the Transfer  Agent or Northern  (with  respect to your  institutional
account)  receives a redemption order by 1:00 p.m.,  Chicago time, on a Business
Day,  redemption  proceeds  will  normally  be paid in  Federal  funds  or other
immediately  available funds wired or sent by check to you or, if you so choose,
to your institutional account with Northern, on the same Business Day.

Redemption  orders received after 1:00 p.m.,  Chicago time, will be effected the
next Business Day. Proceeds for redemption orders received on a non-Business Day
will normally be sent on the next Business Day after receipt in good order.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page [ ].

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

      The  Trust  reserves  the  right to defer  crediting,  sending  or  wiring
     redemption  proceeds for up to 7 days after receiving the redemption  order
     if, in its judgment, an earlier payment could adversely affect a Portfolio.

      If you are redeeming  recently  purchased Premier Shares,  your redemption
     request may not be honored until your check or electronic  transaction  has
     cleared. This may delay your transaction for up to 15 days.

      Institutions  are responsible for  transmitting  redemption  orders to the
     Transfer  Agent and crediting  their  Customers'  accounts with  redemption
     proceeds on a timely basis.

      Redemption  requests  by mail  must be signed  by a person  authorized  by
acceptable documentation on file with the Transfer Agent.

      Dividends on Premier Shares are earned through and including the day prior
to the day on which they are redeemed.

      The  Trust  reserves  the  right  to  redeem  Premier  Shares  held by any
     shareholder  who provides  incorrect or incomplete  account  information or
     when  such   involuntary   redemptions   are  necessary  to  avoid  adverse
     consequences to the Trust and its shareholders.

      The Trust may require any information  reasonably necessary to ensure that
a redemption request has been duly authorized.

      The  Trust  reserves  the  right  to  change  or  discontinue  any  of its
redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their  account  agreements)  may exchange  Premier  Shares of a Portfolio for
Premier Shares of another Portfolio.  The registration of both accounts involved
must be  identical.  A $1,000  minimum  investment  applies.  An  exchange  is a
redemption of shares you own and the purchase of shares you are acquiring. It is
considered a taxable event and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days written notice to shareholders  and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Advance  Notification  of  Large  Transactions.   The  Trust  requests  that  an
Institution  give advance  notice to the Transfer  Agent by 11:00 a.m.,  Chicago
time,  if it intends to place a purchase  or  redemption  order of $5 million or
more on a Business Day.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

     Business Day. A "Business  Day" is each Monday through Friday when Northern
or the New York Stock  Exchange is open for business.  A "Business Day" does not
include a holiday observed by Northern and the Exchange.  In 2000 these holidays
are: New Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolios  reserve the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  They also reserve this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering funds on a timely basis. A Portfolio will be
deemed to have  received an order when the order is  accepted by the  authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Servicing   Agents.   Institutions   perform  (or  arrange  to  have  performed)
administrative  support services and personal and account  maintenance  services
for Customers who are the beneficial  owners of Premier Shares through Servicing
Agreements with the Trust ("Servicing  Agents").  These Servicing Agreements are
permitted  under the Trust's Service Plan ("Service  Plan").  These services may
include:

          establishing and maintaining individual accounts and records;

          processing purchase, redemption and exchange orders;

          placing net purchase and redemption orders with Northern acting as the
     Trust's Transfer Agent; and

          providing cash  management or sweep accounts and similar  programs and
     services.

     Servicing  Agents will receive fees from the  Portfolios for these services
at an annual  rate of up to 0.25% of the  average  daily net asset  value of the
Premier Shares beneficially owned by their Customers.

Personal and account  maintenance  services  provided under the Service Plan may
include:

          providing   information  to  investors  regarding  the  Portfolios  or
     relating to the status of their accounts; and

          acting as liaison between investors and the Trust.

     Servicing Agents will receive additional fees from the Portfolios for these
services at an annual  rate of up to 0.25% of the average  daily net asset value
of Premier Shares beneficially owned by their Customers.

The Service  Plan also  provides  for the payment of fees to  Northern,  PFPC or
other  Institutions  at an annual rate of up to 0.08% of the  average  daily net
asset value of Premier Shares serviced by Institutions  for ongoing  consulting,
technology and systems  support  services  relating to cash  management or sweep
account  services.  All fees payable  under the Service Plan are borne solely by
Premier Shares and not by the Portfolios' other share classes.

Northern  may  provide  additional  compensation  to certain  dealers  and other
financial  intermediaries  who provide services to their Customers who invest in
the Trust or whose Customers purchase significant amounts of Premier Shares of a
Portfolio.  The amount of such  compensation  may be made on a  one-time  and/or
periodic basis,  and may represent all or a portion of the annual fees earned by
Northern as Investment  Adviser (after  adjustments).  This compensation will be
paid by Northern or its affiliates and will not represent an additional  expense
to the Trust or its shareholders.

You should read your account  agreement with your  Institution  carefully.  Your
Institution's  requirements may differ from those listed in this Prospectus.  An
Institution may impose account charges,  such as asset allocation fees,  account
maintenance  fees,  and other  charges  that will  reduce  the net  return on an
investment in a Portfolio. If you have agreed to maintain a minimum balance with
your  Institution and the balance falls below this minimum,  you may be required
to redeem all or a part of your investment in a Portfolio.

Conflict of interest  restrictions may apply to the receipt of compensation from
the Trust by an Institution in connection with the investment of fiduciary funds
in Premier Shares of a Portfolio.  Banks and other institutions regulated by the
Office of Comptroller of the Currency, Board of Governors of the Federal Reserve
System and state banking  commissions,  and investment  advisers and other money
managers  subject to the  jurisdiction  of the SEC, the  Department  of Labor or
state securities commissions, are urged to consult legal counsel before entering
into Servicing Agreements.

State  securities  laws  regarding the  registration  of dealers may differ from
Federal law. As a result,  Institutions investing in the Portfolios on behalf of
their Customers may be required to register as dealers.


Distributions and Taxes

Distributions

Dividends  from net income are declared daily and paid monthly by each Portfolio
to its  shareholders.  Net income includes the interest accrued on a Portfolio's
assets less estimated expenses. Each Portfolio's net realized short-term capital
gains, if any, are  distributed at least annually.  The Portfolios do not expect
to realize net long-term capital gains.

Dividends  are  paid as soon as  practicable  following  the end of each  month,
except in the case of a total redemption of Premier Shares in an account that is
not subject to a standing order for the purchase of additional  Premier  Shares.
In that  event,  dividends  will be paid  promptly  along  with  the  redemption
proceeds.

[All  distributions are automatically  reinvested  (without any sales charge) in
additional  Premier  Shares of the same  Portfolio,  unless you elect to receive
distributions  in cash by notifying the Transfer Agent in writing.] You may make
arrangements to credit these  distributions  to your account with Northern,  its
affiliates or its correspondent banks.

There are no fees or sales charges on reinvestments.

Taxes

Each Portfolio intends to qualify as a regulated  investment company for Federal
tax  purposes,  and  to  distribute  substantially  all  of its  net  income  to
shareholders  each  year.  Except  for  exempt-interest  dividends  paid  by the
Tax-Exempt  and  Municipal  Portfolios,  dividends  derived  from taxable
interest income and short-term capital gains will be taxable as ordinary income,
and  distributions,  if any,  derived  from net  long-term  capital  gains  will
generally  be  taxable  as   long-term   capital   gains,   unless  you  have  a
tax-advantaged  account.  This is true whether  dividends and  distributions are
received in cash or reinvested in Portfolio Premier Shares.


The Tax-Exempt and  Municipal  Portfolios intend to pay substantially all
of their dividends as "exempt-interest dividends," which are exempt from Federal
income taxes. Shareholders who are recipients of Social Security Act or Railroad
Retirement Act benefits should note that exempt-interest dividends will be taken
into account in determining the taxability of their benefit payments. If you
receive an  exempt-interest  dividend with respect to any share and the share is
held for six months or less,  any loss on the sale or exchange of the share will
be disallowed  to the extent of the dividend  amount.  Interest on  indebtedness
incurred by a shareholder  to purchase or carry shares of either the  Tax-Exempt
or Municipal  Portfolios generally will not be deductible for federal income tax
purposes.  In certain  instances,  dividends paid by the Tax-Exempt  and
Municipal  Portfolios,  while exempt from regular Federal income tax, may be
subject to the alternative  minimum tax. In addition,  the Tax-Exempt  Portfolio
may invest a portion of its assets in securities  that  generate  income that is
not exempt from Federal tax. Any dividends paid by the Tax-Exempt Portfolio that
are  derived  from  taxable  interest or from  capital  gains will be subject to
Federal income tax.

The  Tax-Exempt  and  Municipal  Portfolios  will each  determine  annually  the
percentages  of its net  investment  income  which are exempt  from the  regular
Federal income tax,  which  constitute an item of tax preference for purposes of
the Federal alternative minimum tax, and which are fully taxable. The Tax-Exempt
and  Municipal  Portfolios  will  apply  these  percentages   uniformly  to  all
distributions declared from net investment income during that year.

Except as stated below, you may be subject to state and local taxes on Portfolio
distributions and redemptions. State income taxes may not apply, however, to the
portions  of a  Portfolio's  distributions,  if any,  that are  attributable  to
interest on certain types of Federal securities or interest on securities issued
by the particular state or municipalities within the state.

Other Tax Information

Dividends and distributions  from each Portfolio will generally be reportable by
you in the tax year in which  they are paid with one  exception.  Dividends  and
distributions declared by a Portfolio in October,  November or December and paid
in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.

Your investment in the Portfolios  could have additional tax  consequences.
Shareholders who are nonresident  aliens,  foreign trusts or estates, or foreign
corporations or partnerships,  may be subject to different United States Federal
income  tax   treatment. You  should  consult  your  tax  professional  for
information regarding all the tax consequences applicable to your investments in
the  Portfolios.  More  information  is provided in the  Statement of Additional
Information.  This short summary is not intended as a substitute for careful tax
planning.


In  particular,  although  the  Government  Select  Portfolio  intends to invest
primarily  in U.S.  government  securities,  the  interest on which is generally
exempt from state income taxation,  you should consult your own tax professional
to determine  whether this is true in your own situation.  Similarly,  dividends
paid  by  the  Portfolios   (including  the  Tax-Exempt   and   Municipal
Portfolios)  may be taxable  under  state or local law as  dividend  income even
though  all or a portion  of such  dividends  may be derived  from  interest  on
obligations which, if realized directly, would be exempt from such income taxes.


                                YEAR 2000 ISSUES

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 arrives, many systems may be unable to
accurately process certain date-based  information,  which could cause a variety
of operational problems for businesses. This could have a negative effect on the
companies  in  which  the  Portfolios  invest,   thus  hurting  the  Portfolios'
investment returns.

Northern Trust has implemented  steps to prepare its mission  critical  computer
systems and processes for Year 2000  processing.  It has established a dedicated
Year 2000 Project Team whose members have  significant  systems  development and
maintenance   experience.   Northern   Trust's  Year  2000  project  included  a
comprehensive  testing plan of its mission critical systems.  Northern Trust has
advised the Trust that it has completed work on its mission critical systems and
testing with significant outside parties.

Northern  Trust  instituted a program to monitor and assess the efforts of other
parties,  such as other service providers to the Portfolio.  However,  it cannot
control the success of those other parties' efforts. Contingency plans have been
established where believed necessary to provide Northern Trust with alternatives
in case these entities experience significant Year 2000 difficulties that impact
Northern Trust.

Furthermore,  even if the actions taken by Northern  Trust are  successful,  the
normal   operations  of  the  Portfolios   may,  in  any  event,   be  disrupted
significantly  by the failure of  communications  and public utility  companies,
governmental entities,  financial processors or others to perform their services
as a result of Year 2000 problems.

Efforts in foreign  countries to remediate  potential Year 2000 problems are not
as extensive  as those in the United  States.  As a result,  the  operations  of
foreign markets, foreign issuers and foreign governments may be disrupted by the
Year 2000 problem and the  investment  portfolio of a Portfolio may be adversely
affected.



                        RISKS, SECURITIES AND TECHNIQUES


This section takes a closer look at some of the types of securities in which the
Portfolios  may invest and their  related  risks.  It also  explores the various
investment  techniques  that the  investment  management  team  may,  but is not
required to, use. The Portfolios may invest in other  securities and are subject
to further  restrictions  and risks  which are  described  in the  Statement  of
Additional Information.

Asset-Backed Securities.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  Asset-backed securities represent  participations in, or are secured
by  and  payable  from,  pools  of  assets  such  as  mortgages,  motor  vehicle
installment sale contracts,  installment loan contracts, leases of various types
of real and personal  property,  receivables from revolving credit (credit card)
agreements and other financial assets.  Such asset pools are securitized through
the use of privately-formed trusts or special purpose corporations.  Payments or
distributions  of principal and interest may be guaranteed up to certain amounts
and for a certain time period by a letter of credit or a pooled insurance policy
issued by a financial institution, or other credit enhancements.

         Investment  strategy.  The  Diversified  Assets  Portfolio,  Tax-Exempt
         Portfolio and Municipal  Portfolio may purchase various types of
         asset-backed securities that are "Eligible Securities" as defined by
         the SEC. The Government Portfolio may only purchase mortgage-backed
         securities that are guaranteed by the U.S. government,  its agencies or
         instrumentalities.


         Special  risks.  In  addition to credit and market  risk,  asset-backed
         securities  involve  prepayment  risk  because  the  underlying  assets
         (loans) may be prepaid at any time.  The value of these  securities may
         also   change   because   of  actual  or   perceived   changes  in  the
         creditworthiness of the originator,  the servicing agent, the financial
         institution  providing the credit support,  or the  counterparty.  Like
         other fixed income  securities,  when interest rates rise, the value of
         an asset-backed security generally will decline. However, when interest
         rates decline,  the value of an  asset-backed  security with prepayment
         features  may not  increase  as much as  that  of  other  fixed  income
         securities.  In addition,  non-mortgage asset-backed securities involve
         certain risks not presented by mortgage-backed  securities.  Primarily,
         these securities may not have the benefit of the same security interest
         in the underlying  collateral.  Credit card  receivables  are generally
         unsecured,  and the debtors are entitled to the  protection of a number
         of state and Federal consumer credit laws.  Automobile  receivables are
         subject to the risk that the trustee for the holders of the  automobile
         receivables may not have an effective  security  interest in all of the
         obligations backing the receivables.


Borrowings and Reverse  Repurchase  Agreements.  The Portfolios may borrow money
from banks and the  Government  Select,  Government,  Diversified  Assets and
Municipal Portfolios may enter into reverse repurchase agreements with banks
and other financial institutions. Reverse repurchase agreements involve the sale
of money  market  securities  held by a  Portfolio  subject  to the  Portfolio's
agreement to repurchase them at a mutually agreed upon date and price (including
interest).


         Investment strategy. Each Portfolio may borrow in amounts not exceeding
         one-third  of  its  total  assets.   Each  of  the  Government  Select,
         Government,  Diversified  Assets and  Municipal  Portfolios  may
         enter into  reverse  repurchase  agreements  in amounts  not  exceeding
         one-third of its total assets  (including the amount  borrowed).
         These  transactions  may be entered  into as a  temporary  measure  for
         emergency purposes or to meet redemption  requests.  Reverse repurchase
         agreements may also be entered into when the investment management team
         expects that the interest  income to be earned from the  investment  of
         the  transaction  proceeds  will be greater  than the related  interest
         expense.

         Special risks.  Borrowings and reverse  repurchase  agreements  involve
         leveraging.  If the securities held by the Portfolios  decline in value
         while these  transactions are  outstanding,  the net asset value of the
         Portfolios' outstanding shares will decline in value by proportionately
         more than the decline in value of the securities. In addition,  reverse
         repurchase agreements involve the risks that the interest income earned
         by a Portfolio  (from the investment of the proceeds) will be less than
         the interest expense of the  transaction,  that the market value of the
         securities  sold by a  Portfolio  will  decline  below  the  price  the
         Portfolio is obligated to pay to repurchase  the  securities,  and that
         the securities may not be returned to the Portfolio.

Custodial   Receipts   for   Treasury   Securities.   Custodial   receipts   are
participations in trusts that hold U.S.  Treasury  securities and are sold under
names such as TIGRs and CATS. Like other stripped obligations,  they entitle the
holder to future interest or principal payments on the U.S. Treasury securities.

         Investment strategy. The Government,  Diversified Assets and Tax-Exempt
         Portfolios  may  purchase  custodial   receipts.   Investments  by  the
         Government  Portfolio in custodial  receipts will not exceed 35% of the
         value of its total assets.

         Special risks. Like other stripped obligations,  custodial receipts may
         be subject to greater price  volatility than ordinary debt  obligations
         because of the way in which their  principal  and interest are returned
         to investors.

Derivatives.  Each Portfolio may purchase certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from---or  based
upon---the  performance  of  underlying  assets,  interest or currency  exchange
rates,  or indices.  Derivatives  include  structured debt  obligations  such as
collateralized mortgage obligations and other types of asset-backed  securities,
"stripped" securities and various floating rate instruments.

             Investment strategy. A Portfolio will invest in derivatives only if
             the potential risks and rewards are consistent with the Portfolio's
             objective, strategies and overall risk profile.

             Special risks. Engaging in derivative transactions involves special
             risks,  including (a) market risk that the Portfolio's  derivatives
             position will lose value;  (b) credit risk that the counterparty to
             the transaction will default; (c) leveraging risk that the value of
             the derivative  instrument  will decline more than the value of the
             assets on which it is based;  (d) illiquidity risk that a Portfolio
             will be unable to sell its position because of lack of market depth
             or  disruption;  (e)  pricing  risk that the value of a  derivative
             instrument will be difficult to determine;  and (f) operations risk
             that loss will  occur as a result of  inadequate  systems  or human
             error.  Many types of derivatives have been recently  developed and
             have not  been  tested  over  complete  market  cycles.  For  these
             reasons,  a Portfolio may suffer a loss whether or not the analysis
             of the investment management team is accurate.

Diversification. Diversifying its holdings can help a Portfolio reduce the risks
of investing.  In accordance with current SEC  regulations,  each Portfolio will
not invest more than 5% of the value of its total assets at the time of purchase
in the  securities of any single issuer.  However,  a Portfolio may invest up to
25% of the value of its total assets in the securities of a single issuer for up
to three  Business  Days.  These  limitations  do not  apply  to  cash,  certain
repurchase  agreements,  U.S.  government  securities  or  securities  of  other
investment companies.  In addition,  securities subject to certain unconditional
guarantees and securities that are not "First Tier Securities" as defined by the
SEC are subject to different  diversification  requirements  as described in the
Statement of Additional Information.

Downgraded Securities.  After its purchase, a portfolio security may be assigned
a lower rating or cease to be rated. If this occurs, a Portfolio may continue to
hold the issue if the Investment  Adviser believes it is in the best interest of
the Portfolio and its shareholders.

Foreign  Securities.   The  Diversified  Assets  Portfolio  may  invest  in  the
obligations  of foreign  governments,  or any of their  political  subdivisions,
agencies or instrumentalities,  foreign commercial banks and foreign branches of
U.S. banks. It may also invest in U.S.  dollar-denominated  commercial paper and
other obligations of foreign issuers. Foreign government obligations may include
debt   obligations   of   supranational   entities,    including   international
organizations   (such  as  the  European  Coal  and  Steel   Community  and  the
International  Bank for  Reconstruction and Development (also known as the World
Bank)) and international banking institutions and related government agencies.

     Investment  strategy.  Investments by the Diversified  Assets  Portfolio in
foreign issuer  obligations will not exceed 50% of the Portfolio's  total assets
measured at the time of purchase.

         Special  risks.  Foreign  securities  involve  special risks and costs.
         Foreign  securities,  and in particular  foreign debt  securities,  are
         sensitive to changes in interest rates. In addition,  investment in the
         securities  of  foreign  governments  involves  the risk  that  foreign
         governments  may  default on their  obligations  or may  otherwise  not
         respect the integrity of their debt.

         Investment  in  foreign   securities  may  involve  higher  costs  than
         investment in U.S. securities, including higher transaction and custody
         costs  as  well  as the  imposition  of  additional  taxes  by  foreign
         governments. Foreign investments may also involve risks associated with
         less  complete  financial  information  about the issuers,  less market
         liquidity,  more market  volatility and political  instability.  Future
         political  and  economic  developments,   the  possible  imposition  of
         withholding   taxes   on   dividend   income,   possible   seizure   or
         nationalization   of  foreign   holdings  or  the   adoption  of  other
         governmental  restrictions  might  adversely  affect an  investment  in
         foreign securities. Additionally, foreign banks and foreign branches of
         domestic banks may be subject to less stringent  reserve  requirements,
         and to different accounting, auditing and recordkeeping requirements.

Illiquid  or  Restricted  Securities.  Illiquid  securities  include  repurchase
agreements  and time deposits with  notice/termination  dates of more than seven
days,  certain  variable amount master demand notes that cannot be called within
seven  days,  certain  insurance  funding  agreements  (see  below),  and  other
securities  that are traded in the U.S. but are subject to trading  restrictions
because they are not  registered  under the  Securities  Act of 1933, as amended
(the "1933 Act").

         Investment  strategy.  Each  Portfolio  may invest up to 10% of its net
         assets in securities that are illiquid.  A domestically traded security
         which is not  registered  under  the  1933  Act will not be  considered
         illiquid if the Investment  Adviser determines that an adequate trading
         market exists for that  security.  If otherwise  consistent  with their
         investment  objectives  and  policies,   the  Portfolios  may  purchase
         commercial  paper  issued  pursuant to Section 4(2) of the 1933 Act and
         securities  that are not registered  under the 1933 Act but can be sold
         to "qualified  institutional buyers" in accordance with Rule 144A under
         the 1933 Act. These securities will not be considered  illiquid so long
         as Northern determines,  under guidelines approved by the Trust's Board
         of Trustees, that an adequate trading market exists.

         Special  risks.  Because  illiquid  and  restricted  securities  may be
         difficult  to sell at an  acceptable  price,  they  may be  subject  to
         greater  volatility  and  may  result  in a loss  to a  Portfolio.  The
         practice of  investing in Rule 144A  Securities  and  commercial  paper
         available to qualified institutional buyers could increase the level of
         illiquidity  during  any period  that  qualified  institutional  buyers
         become uninterested in purchasing these securities.

Insurance  Funding  Agreements.  An insurance  funding  agreement  ("IFA") is an
agreement that requires a Portfolio to make cash contributions to a deposit fund
of an insurance  company's  general account.  The insurance company then credits
interest to the Portfolio for a set time period.

         Investment  strategy.  The Diversified  Assets  Portfolio may invest in
         IFAs  issued by  insurance  companies  that  meet  quality  and  credit
         standards established by the Investment Adviser.

         Special risks.  IFAs are not insured by a government  agency--they  are
         backed only by the  insurance  company that issues  them.  As a result,
         they are subject to default  risk.  In  addition,  an active  secondary
         market in IFAs does not  currently  exist.  This  means  that it may be
         difficult to sell an IFA at an appropriate price.

Investment  Companies.  In  connection  with the  management of their daily cash
positions, the Portfolios may invest in shares of other money market funds which
invest in short-term,  high quality debt  securities  and  securities  issued by
other  investment  companies  consistent  with their  investment  objectives and
policies.

             Investment  strategy.  Investments  by a  Portfolio  in other money
             market funds will be subject to the  limitations  of the Investment
             Company Act of 1940.  [Although the  Portfolios do not expect to do
             so in the  foreseeable  future,  each  Portfolio is  authorized  to
             invest  substantially  all of its assets in an open-end  investment
             company  that  has the  same  investment  objective,  policies  and
             fundamental restrictions as the Portfolio.]

             Special risks. As a shareholder of another  investment  company,  a
             Portfolio  would be subject to the same risks as any other investor
             in that company.  It would also bear a  proportionate  share of any
             fees or expenses paid by that company.  These  expenses would be in
             addition to the  advisory  fees and other  expenses  the  Portfolio
             bears directly in connection with its own operations.

Municipal  and  Related   Instruments.   Municipal   instruments   include  debt
obligations issued by or on behalf of states, territories and possessions of the
United  States  and their  political  subdivisions,  agencies,  authorities  and
instrumentalities.

Municipal  instruments  include both  "general" and  "revenue"  bonds and may be
issued to obtain funds for various  public  purposes.  General  obligations  are
secured by the  issuer's  pledge of its full  faith,  credit  and taxing  power.
Revenue obligations are payable only from the revenues derived from a particular
facility or class of facilities.  In some cases,  revenue bonds are also payable
from the proceeds of a special excise or other  specific  revenue source such as
lease  payments from the user of a facility being  financed.  Some municipal
instruments, known as private activity bonds, are issued to finance projects for
private companies.  Private activity bonds are usually revenue obligations since
they are typically payable by the private user of the facilities financed by the
bonds. Municipal  instruments  also include "moral  obligation"  bonds,
municipal leases,  certificates of participation and custodial  receipts.  Moral
obligation  bonds are supported by a moral commitment but not a legal obligation
of a state or  municipality.  Municipal  leases and  participation  certificates
present the risk that the state or  municipality  involved will not  appropriate
the monies to meet  scheduled  payments on an annual basis.  Custodial  receipts
represent interests in municipal instruments held by a trustee.

During extraordinary  circumstances,  the Tax-Exempt Portfolio may invest in AMT
obligations  such as certain  bonds  issued to obtain  funds to provide  certain
water, sewage and solid waste facilities, qualified residential rental projects,
certain local electric,  gas and other heating or cooling facilities,  qualified
hazardous waste facilities, and government-owned airports, docks and wharves and
mass  commuting  facilities;   certain  qualified  mortgage,  student  loan  and
redevelopment  bonds;  and certain  bonds  issued as part of "small  issues" for
industrial facilities.

The  Municipal  Portfolio  may acquire  "stand-by  commitments"  relating to the
municipal instruments it holds. Under a stand-by commitment,  a dealer agrees to
purchase,  at the  Portfolio's  option,  specified  municipal  instruments  at a
specified price. A stand-by commitment may increase the cost, and thereby reduce
the yield,  of the municipal  instruments to which the commitment  relates.  The
Municipal  Portfolio  will acquire  stand-by  commitments  solely to  facilitate
portfolio  liquidity  and does not intend to exercise  their  rights for trading
purposes.

             Investment  strategy.  [Although it is not each Portfolio's current
             policy  to  do so on a  regular  basis,]  in  connection  with  its
             investments in municipal instruments,  the Tax-Exempt and Municipal
             Portfolios  may each  invest  more than 25% of its total  assets in
             municipal  instruments  the interest upon which is paid solely from
             revenues of similar  projects.  The  Tax-Exempt  Portfolio may also
             invest more than 25% of its total assets in industrial  development
             obligations or municipal  instruments whose issuers are in the same
             state. However, neither the Tax-Exempt nor the Municipal Portfolios
             intends to invest more than 25% of the value of its total assets in
             industrial  development  bonds or  similar  obligations  where  the
             non-governmental  entities supplying the revenues to be paid are in
             the same industry.

             The  Diversified  Assets  Portfolio  may invest up to 5% of its net
             assets in municipal instruments or other securities issued by state
             and local governmental bodies.  Generally, this will occur when the
             yield of municipal  instruments,  on a pre-tax basis, is comparable
             to  that  of  other  permitted   short-term  taxable   investments.
             Dividends  paid  by  the  Diversified   Assets  Portfolio  on  such
             investments will be taxable to shareholders.

         Special risks.  Municipal  instruments  purchased by the Tax-Exempt and
         Municipal  Portfolios may be backed by letters of credit,  insurance or
         other  forms  of  credit  enhancement  issued  by  foreign  (as well as
         domestic) banks, insurance companies and other financial  institutions.
         If the  credit  quality  of  these  banks  and  financial  institutions
         declines,  a  Portfolio  could  suffer  a loss to the  extent  that the
         Portfolio is relying upon this credit support. Foreign institutions can
         present special risks relating to higher transaction and custody costs,
         the  imposition  of  additional  taxes  by  foreign  governments,  less
         complete  financial  information,  less market  liquidity,  more market
         volatility  and  political   instability.   Foreign  banks,   insurance
         companies and financial  institutions  may be subject to less stringent
         reserve  requirements,  and  to  different  accounting,   auditing  and
         recordkeeping requirements than U.S banks.

         In  addition,  when a substantial  portion of a  Portfolio's  assets is
             invested  in  instruments  which  are  used to  finance  facilities
             involving  a  particular  industry,  whose  issuers are in the same
             state or which are otherwise  related,  there is a possibility that
             an  economic,  business  or  political  development  affecting  one
             instrument would likewise affect the related instrument.


Repurchase Agreements.  Repurchase agreements involve the purchase of securities
by a  Portfolio  subject  to the  seller's  agreement  to  repurchase  them at a
mutually agreed upon date and price.

         Investment   strategy.   Each  Portfolio  may  enter  into   repurchase
         agreements with financial institutions such as banks and broker-dealers
         that are deemed to be creditworthy by the Investment Adviser.  Although
         the securities  subject to a repurchase  agreement may have  maturities
         exceeding one year,  settlement of the agreement  will never occur more
         than one year after a Portfolio acquires the securities.

         Special  risks.  In the event of a default,  a Portfolio  will suffer a
         loss to the extent that the  proceeds  from the sale of the  underlying
         securities and other  collateral are less than the repurchase price and
         the  Portfolio's  costs  associated  with delay and  enforcement of the
         repurchase  agreement.  In  addition,  in the  event of  bankruptcy,  a
         Portfolio   could  suffer  losses  if  a  court   determines  that  the
         Portfolio's interest in the collateral is not enforceable.

Securities  Lending.  In order to generate additional income, the Portfolios may
lend  securities  on a short-term  basis to banks,  brokers and dealers or other
qualified  institutions.  In exchange,  the Portfolios  will receive  collateral
equal to at least 100% of the value of the securities loaned.

         Investment  strategy.  Securities  lending may  represent  no more than
         one-third the value of a Portfolio's  total assets  (including the loan
         collateral).  Any cash collateral received by a Portfolio in connection
         with these  loans may be  invested in U.S.  government  securities  and
         other liquid high-grade debt obligations.

         Special risks. The main risk when lending portfolio  securities is that
         the borrower  might become  insolvent or refuse to honor its obligation
         to return the securities.  In this event, a Portfolio could  experience
         delays in recovering  its  securities  and may possibly incur a capital
         loss. In addition, a Portfolio may incur a loss in reinvesting the cash
         collateral it receives.

     Stripped  Obligations.  These securities are issued by the U.S.  government
(or agency or instrumentality), foreign governments or banks and other financial
institutions.  They entitle the holder to receive  either  interest  payments or
principal  payments  that have been  "stripped"  from a debt  obligation.  These
obligations include stripped  mortgage-backed  securities,  which are derivative
multi-class mortgage securities.

     Investment   strategy.   Each  of  the  Portfolios  may  purchase  stripped
securities.

         Special risks.  Stripped securities are very sensitive to interest rate
         changes and to the rate of principal prepayments. A rapid or unexpected
         increase in mortgage  prepayments  could severely  depress the price of
         certain  stripped  mortgage-backed  securities and adversely affect the
         Portfolios' total returns.

United States Government  Obligations.  These include U.S. Treasury obligations,
such as bills,  notes and bonds,  which generally  differ only in terms of their
interest rates, maturities and time of issuance.  These also include obligations
issued   or   guaranteed   by  the  U.S.   government   or  its   agencies   and
instrumentalities.  Securities  guaranteed  as to principal  and interest by the
U.S.  government,  its agencies or  instrumentalities  are deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of  credit  issued  by the U.S.  government  or an agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         Investment  strategy.  To the  extent  consistent  with its  investment
         objective,  each  Portfolio  may invest in a variety  of U.S.  Treasury
         obligations and obligations issued or guaranteed by the U.S. government
         or its agencies and instrumentalities.


         Special  risks.  Not all U.S.  government  obligations  carry  the same
         guarantees.  Some,  such as those of the Government  National  Mortgage
         Association ("GNMA"), are supported by the full faith and credit of the
         United States Treasury. Other obligations, such as those of the Federal
         Home Loan  Banks,  are  supported  by the right of the issuer to borrow
         from the United States  Treasury;  and others,  such as those issued by
         the Federal National Mortgage  Association  ("FNMA"),  are supported by
         the  discretionary  authority  of the U.S.  government  to purchase the
         agency's obligations.  Still others are supported only by the credit of
         the instrumentality. No assurance can be given that the U.S. government
         would provide financial support to its agencies or instrumentalities if
         it is not obligated to do so by law.  There is no assurance  that these
         commitments  will be  undertaken  or complied  with in the  future.  In
         addition, the secondary market for certain participations in loans made
         to foreign governments or their agencies may be limited.

     Taxable  Investments.  Taxable investments include U.S.  dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and related  custodial  receipts;  and repurchase  agreements
relating to the above instruments.

         Investment  strategy.  The Tax-Exempt and Municipal Portfolios may each
         invest  from  time to  time,  on a  temporary  basis  or for  temporary
         defensive   purposes,   in  short-term  taxable  instruments  that  are
         "Eligible Securities" as defined by the SEC for money market funds.

         Special   risks.   Dividends  paid  by  the  Tax-Exempt  and  Municipal
         Portfolios  that are derived from interest paid on taxable  investments
         will generally be taxable to each Portfolio's  shareholders as ordinary
         income for Federal  income tax purposes.  The  Tax-Exempt and Municipal
         Portfolios  each may not  achieve  its  investment  objective  when its
         assets are invested in taxable obligations.


Variable and Floating Rate  Instruments.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at a margin  above a  generally  recognized  index  rate.  These
instruments  include  long-term  variable  and  floating  rate bonds  (sometimes
referred to as "Put  Bonds")  where a Portfolio  obtains at the time of purchase
the  right  to put the  bond  back to the  issuer  or a third  party at par at a
specified date.

             Investment strategy. Each Portfolio may invest in rated and unrated
             variable and floating  rate  instruments  to the extent  consistent
             with its investment objective. Unrated instruments may be purchased
             by a Portfolio if they are determined by the Investment  Adviser to
             be of comparable quality to rated instruments eligible for purchase
             by the  Portfolio.  The  Portfolios  may invest in variable  amount
             master demand notes.

             Special risks.  Variable and floating rate  instruments are subject
             to  the  same  risks  as  fixed  income  investments,  particularly
             interest rate and credit risk. Because there is no active secondary
             market for certain variable and floating rate instruments, they may
             be more  difficult  to sell if the issuer  defaults  on its payment
             obligations  or during periods when the Portfolios are not entitled
             to exercise their demand rights. As a result,  the Portfolios could
             suffer a loss with respect to these instruments.

When-Issued Securities, Delayed Delivery Transactions and Forward Commitments. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

         Investment strategy.  Each Portfolio may purchase or sell securities on
         a when-issued,  delayed delivery or forward commitment basis.  Although
         the   Portfolios   would   generally   purchase   securities  in  these
         transactions  with the  intention  of  acquiring  the  securities,  the
         Portfolios  may dispose of such  securities  prior to settlement if the
         investment management team deems it appropriate to do so.

         Special risks. Purchasing securities on a when-issued, delayed delivery
         or forward  commitment  basis involves the risk that the securities may
         decrease in value by the time they are  actually  issued or  delivered.
         Conversely,  selling securities in these transactions involves the risk
         that the value of the securities may increase  before the time they are
         actually issued or delivered.  These transactions also involve the risk
         that  the  seller  may  fail to  deliver  the  security  or cash on the
         settlement date.



<PAGE>


42

                                    APPENDIX


                         PORTFOLIO FINANCIAL HIGHLIGHTS

The  financial   highlights  tables  are  intended  to  help  you  understand  a
Portfolio's   financial   performance  for  the  [period  of  each   Portfolio's
operations]. Certain information reflects financial results for a single Premier
Share. The total returns in the tables represent the rate that an investor would
have earned or lost on an investment in a Portfolio  (assuming  reinvestment  of
all  dividends and  distributions).  This  information  has been audited by [ ],
whose  report is  included  in the  Portfolios'  annual  report  along  with the
Portfolios'  financial  statements.  The annual report and semiannual report are
available  upon request and without  charge.  As of November  30, 1999,  Premier
Shares of the  Tax-Exempt  and Municipal  Portfolios  had not been issued to the
public.


Financial Highlights




<PAGE>



For More Information

Annual/Semiannual Report

Additional  information  about the  Portfolios'  investments is available in the
Portfolios' annual and semiannual reports to shareholders.

Statement of Additional Information

Additional information about the Portfolios and their policies is also available
in the  Portfolios'  Statement of  Additional  Information  ("SAI").  The SAI is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The  Portfolios'  annual and  semiannual  reports and the SAI are available free
upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:
By telephone - Call 1-800-637-1380
By mail - Northern Institutional Funds
                P.O. Box 75943
                Chicago, IL  60675
On the Internet - Text-only versions of the Portfolios'  documents are available
on the SEC's website at http://www.sec.gov

You may review and obtain copies of Trust documents by visiting the SEC's Public
Reference Room in Washington, D.C. You may also obtain copies of Trust documents
by sending your  request and a  duplicating  fee to the SEC's  Public  Reference
Section,   Washington,   D.C.   20549-0102   or   by   electronic   request   at
[email protected].  Information  on the operation of the Public  Reference Room
may be obtained by calling the SEC at 1-202-942-8090.

                                     [LOGO]

                                    811-3605



<PAGE>



                                     PART B

                       STATEMENT OF ADDITIONAL INFORMATION

                          NORTHERN INSTITUTIONAL FUNDS


                               BALANCED PORTFOLIO
                             EQUITY INDEX PORTFOLIO
                          DIVERSIFIED GROWTH PORTFOLIO
                            FOCUSED GROWTH PORTFOLIO
                          SMALL COMPANY INDEX PORTFOLIO
                         SMALL COMPANY GROWTH PORTFOLIO
                            MID CAP GROWTH PORTFOLIO
                             MARKETCOMMAND PORTFOLIO
                      INTERNATIONAL EQUITY INDEX PORTFOLIO
                         INTERNATIONAL GROWTH PORTFOLIO


         This  Statement  of  Additional  Information  dated  April 1, 2000 (the
"Additional  Statement")  is not a prospectus.  Copies of the  prospectus  dated
April 1,  2000 for the  Balanced,  Equity  Index,  Diversified  Growth,  Focused
Growth,   Small  Company   Index,   Small  Company   Growth,   Mid  Cap  Growth,
MarketCommand,  International  Equity Index and International  Growth Portfolios
(the  "Portfolios") of Northern  Institutional  Funds (the  "Prospectus") may be
obtained without charge by calling 1-800-637-1380 (toll-free).
Capitalized  terms  not  otherwise  defined  have  the  same  meaning  as in the
Prospectus.

         The audited  financial  statements and related  report of  ___________,
independent  auditors,  contained  in  the  Annual  Report  to  the  Portfolio's
shareholders for the fiscal year ended November 30, 1999 are incorporated herein
by reference in the section  "Financial  Statements."  No other  portions of the
Fund's Annual Reports are incorporated by reference.


<PAGE>



                                      INDEX

<TABLE>
<CAPTION>
<S><C>                                                                                                        <C>
                                                                                                               Page

ADDITIONAL INVESTMENT INFORMATION................................................................................3
     Classification and History..................................................................................3
     Investment Objectives, Strategies and Risks.................................................................3
     Investment Restrictions....................................................................................23
ADDITIONAL TRUST INFORMATION....................................................................................27
     Trustees and Officers......................................................................................27
     Investment Advisers, Transfer Agent and Custodian..........................................................32
     Portfolio Transactions.....................................................................................39
     Portfolio Valuation........................................................................................44
     Co-Administrators and Distributor..........................................................................44
     Shareholder Servicing Plan.................................................................................47
     Counsel and Auditors.......................................................................................49
     In-Kind Purchases and Redemptions..........................................................................49
PERFORMANCE INFORMATION.........................................................................................50
TAXES    62
     Taxation of Certain Financial Instruments..................................................................63
     Foreign Investors..........................................................................................64
DESCRIPTION OF SHARES...........................................................................................65
OTHER INFORMATION...............................................................................................70
FINANCIAL STATEMENTS............................................................................................71
APPENDIX A.......................................................................................................1
APPENDIX B.......................................................................................................1
</TABLE>



No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection  with the offering made by the  Prospectus  and, if given or made,
such  information  or  representations  must not be relied  upon as having  been
authorized by the Trust or its  distributor.  The Prospectus does not constitute
an offering by the Trust or by the distributor in any jurisdiction in which such
offering may not lawfully be made.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  An  investment  in a Portfolio  involves  investment  risks,  including
possible loss of principal.



<PAGE>


                        ADDITIONAL INVESTMENT INFORMATION

                           Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment  company.  Each  Portfolio  except  the  MarketCommand  Portfolio  is
classified as diversified  under the Investment  Company Act of 1940, as amended
(the "1940 Act"). The MarketCommand  Portfolio is classified as  non-diversified
under the 1940 Act.

         Each Portfolio is a series of the Trust, which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").   The  Trust  is  the  result  of  a  reorganization  of  a
Massachusetts  business trust formerly known as The Benchmark Funds on March 31,
1998.  The  Trust's  name was  changed  from  The  Benchmark  Funds to  Northern
Institutional  Funds on July 15, 1998.  The Trust also offers six fixed  income,
one balanced, and five money market portfolios,  which are not described in this
document.
                   Investment Objectives, Strategies and Risks

         The following  supplements  the investment  objectives,  strategies and
risks  of  the  Portfolios  as  set  forth  in the  Prospectus.  The  investment
objectives  of the  MarketCommand,  Mid Cap  Growth  and  Small  Company  Growth
Portfolios may be changed without shareholder approval. The investment objective
of each other  Portfolio may not be changed  without the vote of the majority of
the Portfolio's  outstanding shares.  Except as expressly noted below,  however,
each  Portfolio's   investment  policies  may  be  changed  without  shareholder
approval.

         Warrants.  The Balanced,  Diversified  Growth,  Focused  Growth,  Small
Company   Index,   Small  Company   Growth,   Mid  Cap  Growth,   MarketCommand,
International  Equity Index and  International  Growth  Portfolios  may purchase
warrants  and  similar  rights,  which are  privileges  issued  by  corporations
enabling the owners to subscribe to and purchase a specified number of shares of
the  corporation  at a specified  price during a specified  period of time.  The
prices  of  warrants  do  not  necessarily  correlate  with  the  prices  of the
underlying  shares.  The purchase of warrants involves the risk that a Portfolio
could  lose the  purchase  value of a  warrant  if the  right  to  subscribe  to
additional shares is not exercised prior to the warrant's expiration.  Also, the
purchase of warrants  involves  the risk that the  effective  price paid for the
warrant added to the  subscription  price of the related security may exceed the
value  of the  subscribed  security's  market  price  such as when  there  is no
movement in the level of the  underlying  security.  A Portfolio will not invest
more than 5% of its total assets,  taken at market value, in warrants.  Warrants
acquired  by a  Portfolio  in shares or  attached  to other  securities  are not
subject to this restriction.

         U.S. Government  Obligations.  Examples of the types of U.S. Government
obligations that may be acquired by the Portfolios  include U.S. Treasury Bills,
Treasury  Notes and  Treasury  Bonds and the  obligations  of Federal  Home Loan
Banks,  Federal  Farm Credit  Banks,  Federal  Land Banks,  the Federal  Housing
Administration,  Farmers Home  Administration,  Export-Import Bank of the United
States, Small Business  Administration,  Federal National Mortgage  Association,
Government  National  Mortgage  Association,  General  Services  Administration,
Central Bank for Cooperatives,  Federal Home Loan Mortgage Corporation,  Federal
Intermediate Credit Banks, and the Maritime Administration.

     American Depository  Receipts ("ADRs").  The Portfolios may invest in ADRs.
ADRs are  receipts  typically  issued by a United  States bank or trust  company
evidencing ownership of the underlying foreign securities and are denominated in
U.S. dollars. Some institutions issuing ADRs may not be sponsored by the issuer.

         A  non-sponsored  depository  may  not  provide  the  same  shareholder
information  that a  sponsored  depository  is  required  to  provide  under its
contractual arrangement with the issuer.

     European  Depository  Receipts ("EDRs").  The Portfolios may also invest in
EDRs and  GDRs.  EDRs  and GDRs are  receipts  issued  by a  non-U.S.  financial
institution  evidencing  ownership of underlying foreign or U.S.  securities and
are  usually  denominated  in  foreign  currencies.  EDRs  and  GDRs  may not be
denominated in the same currency as the securities  they  represent.  Generally,
EDRs and GDRs are designed for use in the foreign securities markets.

         Foreign  Securities.  Investment in foreign securities involves special
risks. These include market risk,  interest rate risk and the risks of investing
in  securities  of  foreign  issuers  and  of  companies  whose  securities  are
principally  traded outside the United States and in investments  denominated in
foreign currencies.  Market risk involves the possibility that stock prices will
decline  over  short or even  extended  periods.  The stock  markets  tend to be
cyclical,  with  periods of  generally  rising  prices and periods of  generally
declining  prices.  These  cycles will affect the value of the  Portfolio to the
extent that it invests in foreign stocks. The holdings of the Portfolios, to the
extent that they invest in fixed income securities, will be sensitive to changes
in  interest  rates  and  the  interest  rate  environment.   In  addition,  the
performance of investments in securities  denominated in a foreign currency will
depend on the strength of the foreign  currency  against the U.S. dollar and the
interest rate  environment  in the country  issuing the  currency.  Absent other
events which could otherwise  affect the value of a foreign  security (such as a
change in the political climate or an issuer's credit quality),  appreciation in
the value of the foreign  currency  generally  can be  expected to increase  the
value of a foreign  currency-denominated  security in terms of U.S.  dollars.  A
rise in foreign  interest rates or decline in the value of the foreign  currency
relative to the U.S. dollar  generally can be expected to depress the value of a
foreign currency-denominated security.

         There  are other  risks and costs  involved  in  investing  in  foreign
securities  which  are in  addition  to the usual  risks  inherent  in  domestic
investments.  Investment  in  foreign  securities  involves  higher  costs  than
investment in U.S. securities, including higher transaction and custody costs as
well as the  imposition  of  additional  taxes by foreign  governments.  Foreign
investments  also involve risks  associated with the level of currency  exchange
rates,  less  complete  financial  information  about the  issuers,  less market
liquidity,  more market volatility and political  instability.  Future political
and economic  developments,  the possible  imposition  of  withholding  taxes on
dividend income,  the possible seizure or  nationalization  of foreign holdings,
the  possible  establishment  of  exchange  controls,  or the  adoption of other
governmental  restrictions  might  adversely  affect an  investment  in  foreign
securities.  Additionally,  foreign banks and foreign branches of domestic banks
are subject to less stringent reserve requirements, and to different accounting,
auditing and recordkeeping requirements.

         Unanticipated political, economic or social developments may affect the
value  of a  Portfolio's  investments  in  emerging  market  countries  and  the
availability to a Portfolio of additional  investments in these countries.  Some
of these  countries  may have in the past failed to recognize  private  property
rights and may have at times  nationalized or expropriated the assets of private
companies.  The small size and inexperience of the securities markets in certain
of such  countries  and the  limited  volume of trading in  securities  in those
countries may make a Portfolio's investments in such countries illiquid and more
volatile than  investments in Japan or most Western  European  countries,  and a
Portfolio may be required to establish special  custodial or other  arrangements
before  making  certain  investments  in those  countries.  There  may be little
financial or accounting information available with respect to issuers located in
certain of such  countries,  and it may be  difficult  as a result to assess the
value or prospects of an investment in such issuers.

         Although a Portfolio  may invest in securities  denominated  in foreign
currencies,  its  portfolio  securities  and  other  assets  are  valued in U.S.
dollars.  Currency exchange rates may fluctuate significantly over short periods
of time causing,  together with other factors,  a Portfolio's net asset value to
fluctuate as well. Currency exchange rates can be affected  unpredictably by the
intervention  or the  failure to  intervene  by U.S. or foreign  governments  or
central banks, or by currency controls or political  developments in the U.S. or
abroad.  To the extent that a Portfolio's  total  assets,  adjusted to reflect a
Portfolio's  net position  after  giving  effect to currency  transactions,  are
denominated  in the  currencies of foreign  countries,  a Portfolio will be more
susceptible to the risk of adverse  economic and political  developments  within
those  countries.  A Portfolio  is also subject to the  possible  imposition  of
exchange control regulations or freezes on the convertibility of currency.

     Dividends  and  interest  payable  on  a  Portfolio's   foreign   portfolio
securities may be subject to foreign withholding taxes. To the extent such taxes
are not offset by credits or deductions  allowed to investors under U.S. federal
income tax law, they may reduce the net return to the shareholders. See "Taxes."

         The  Small  Company  Growth  Portfolio  may  invest  in  foreign  debt,
including the securities of foreign governments.  Several risks exist concerning
such  investments,  including the risk that foreign  governments  may default on
their  obligations,  may not respect the integrity of such debt,  may attempt to
renegotiate  the debt at a lower rate,  and may not honor  investments by United
States entities or citizens.

         To the extent consistent with its investment objective, a Portfolio may
also invest in  obligations of the  International  Bank for  Reconstruction  and
Development  (also known as the World Bank) which are  supported by  subscribed,
but unpaid,  commitments  of its member  countries.  There is no assurance  that
these commitments will be undertaken or complied with in the future.

         Investors   should   understand   that  the   expense   ratios  of  the
International  Equity Index and International  Growth Portfolios can be expected
to be higher than those funds investing  primarily in domestic  securities.  The
costs  attributable to investing  abroad are usually higher for several reasons,
such as the  higher  cost of  investment  research,  higher  cost of  custody of
foreign  securities,  higher  commissions  paid on  comparable  transactions  on
foreign  markets and  additional  costs  arising from delays in  settlements  of
transactions involving foreign securities.


         As noted in the Prospectus,  the  International  Equity Index Portfolio
invests primarily in the equity securities  included in the Europe and Australia
for East Equity Index ("EAFE Index"). As of November 30, 1999, fourteen European
countries (Austria,  Belgium, Denmark, Finland, France, Germany, Ireland, Italy,
the  Netherlands,  Norway,  Spain,  Sweden,  Switzerland and the United Kingdom)
constitute  approximately  73% of the EAFE Index.  Six  Asian/Pacific  countries
(Australia,  Hong Kong, Japan,  Malaysia, New Zealand and Singapore) account for
the remaining 27%.

         Countries  in which  the  International  Growth  Portfolio  may  invest
include, but are not limited to: Argentina, Australia, Austria, Belgium, Brazil,
Canada, Chile, Colombia,  Czech Republic,  Denmark,  Finland,  France,  Germany,
Greece,  Hong  Kong,  Hungary,   Indonesia,   Ireland,   Israel,  Italy,  Japan,
Luxembourg,  Malaysia,  Mexico, the Netherlands,  New Zealand, Norway, Peru, the
Philippines,  Poland,  Portugal,  Singapore,  South Africa,  South Korea, Spain,
Sweden, Switzerland, Taiwan, Thailand, Turkey, the United Kingdom and Venezuela.

         The end of the Cold War, the reunification of Germany, the accession of
new Western European members to the European Economic and Monetary Union and the
aspirations of Eastern  European  states to join and other  political and social
events in  Europe  have  caused  considerable  economic,  social  and  political
dislocation.  In addition,  events in the Japanese economy, as well as political
and social  developments  there have affected  Japanese  securities and currency
markets, and the relationship of the Japanese yen with other currencies and with
the U.S. dollar. Future political, economic and social developments in Japan and
in the  Asia/Pacific  regional  context can be  expected  to produce  continuing
effects on securities and currency markets.

         Foreign Currency  Transactions.  In order to protect against a possible
loss on investments  resulting from a decline or  appreciation in the value of a
particular  foreign currency against the U.S. dollar or another foreign currency
or for other reasons,  the Balanced,  Diversified Growth,  Focused Growth, Small
Company Growth, Mid Cap Growth,  MarketCommand,  International  Equity Index and
International  Growth  Portfolios are  authorized to enter into forward  foreign
currency exchange  contracts.  These contracts involve an obligation to purchase
or sell a specified  currency at a future date at a price set at the time of the
contract. Forward currency contracts do not eliminate fluctuations in the values
of  portfolio  securities  but rather  allow a Portfolio  to establish a rate of
exchange for a future point in time.

         When entering into a contract for the purchase or sale of a security, a
Portfolio may enter into a forward foreign  currency  exchange  contract for the
amount of the purchase or sale price to protect against variations,  between the
date the security is purchased or sold and the date on which  payment is made or
received,  in the value of the foreign  currency  relative to the U.S. dollar or
other foreign currency.

         When the  investment  management  team  anticipates  that a  particular
foreign currency may decline substantially  relative to the U.S. dollar or other
leading  currencies,  in order to reduce  risk,  a  Portfolio  may enter  into a
forward  contract to sell,  for a fixed amount,  the amount of foreign  currency
approximating the value of some or all of the Portfolio's securities denominated
in such foreign  currency.  Similarly,  when the securities  held by a Portfolio
create a short  position in a foreign  currency,  the Portfolio may enter into a
forward  contract  to buy,  for a fixed  amount,  an amount of foreign  currency
approximating  the short  position.  A  Portfolio's  net long and short  foreign
currency  exposure  will not exceed its total asset  value.  With respect to any
forward foreign  currency  contract,  it will not generally be possible to match
precisely the amount  covered by that  contract and the value of the  securities
involved  due to the  changes in the values of such  securities  resulting  from
market  movements  between the date the forward contract is entered into and the
date it matures. In addition,  while forward contracts may offer protection from
losses  resulting  from  declines or  appreciation  in the value of a particular
foreign  currency,  they also limit  potential  gains  which  might  result from
changes in the value of such  currency.  A  Portfolio  may also  incur  costs in
connection with forward foreign currency  exchange  contracts and conversions of
foreign currencies and U.S. dollars.

         In addition,  the  International  Growth Portfolio may purchase or sell
forward foreign currency exchange  contracts to seek to increase total return or
for cross-hedging  purposes.  The Portfolio may engage in cross-hedging by using
forward contracts in one currency to hedge against  fluctuations in the value of
securities denominated in a different currency if the investment management team
believes that there is a pattern of correlation between the two currencies.

         Liquid assets equal to the amount of a Portfolio's assets that could be
required to consummate forward contracts will be segregated except to the extent
the contracts are otherwise  "covered." The segregated  assets will be valued at
market or fair  value.  If the  market or fair  value of such  assets  declines,
additional  liquid  assets  will be  segregated  daily so that the  value of the
segregated assets will equal the amount of such commitments by the Portfolio.  A
forward contract to sell a foreign currency is "covered" if a Portfolio owns the
currency (or securities denominated in the currency) underlying the contract, or
holds a forward  contract (or call option)  permitting  the Portfolio to buy the
same  currency  at a price that is (i) no higher than the  Portfolio's  price to
sell  the  currency  or (ii)  greater  than  the  Portfolio's  price to sell the
currency  provided the Portfolio  segregates  liquid assets in the amount of the
difference.  A forward  contract  to buy a foreign  currency is  "covered"  if a
Portfolio holds a forward contract (or call option)  permitting the Portfolio to
sell the same  currency  at a price  that is (i) as high as or  higher  than the
Portfolio's  price to buy the currency or (ii) lower than the Portfolio's  price
to buy the  currency  provided the  Portfolio  segregates  liquid  assets in the
amount of the difference.

         Options.  Each  Portfolio  may buy put options and buy call options and
write  covered  call and  secured  put  options.  Such  options  may  relate  to
particular   securities,   foreign  and  domestic   stock   indices,   financial
instruments, or foreign currencies and may or may not be listed on a domestic or
foreign  securities  exchange or issued by the Options Clearing  Corporation.  A
call option for a  particular  security or currency  gives the  purchaser of the
option the right to buy, and a writer the  obligation  to sell,  the  underlying
security  or  currency  at the  stated  exercise  price at any time prior to the
expiration  of the option,  regardless  of the market  price of the  security or
currency. The premium paid to the writer is in consideration for undertaking the
obligation under the option contract.  A put option for a particular security or
currency  gives the  purchaser the right to sell the security or currency at the
stated  exercise price to the expiration  date of the option,  regardless of the
market  price of the  security  or  currency.  In  contrast  to an  option  on a
particular security, an option on an index provides the holder with the right to
make or receive a cash  settlement  upon  exercise of the option.  The amount of
this settlement will be equal to the difference between the closing price of the
index at the time of exercise and the exercise price of the option  expressed in
dollars, times a specified multiple.

         Options trading is a highly specialized  activity which entails greater
than ordinary  investment  risk.  Options on particular  securities  may be more
volatile than the underlying instruments,  and therefore, on a percentage basis,
an  investment  in  options  may be  subject  to  greater  fluctuation  than  an
investment in the underlying instruments themselves.

         The  Portfolios  will write call options only if they are "covered." In
the case of a call option on a security or currency,  the option is "covered" if
a Portfolio owns the security or currency underlying the call or has an absolute
and immediate right to acquire that security or currency without additional cash
consideration (or, if additional cash  consideration is required,  liquid assets
in such amount are segregated)  upon conversion or exchange of other  securities
held by it. For a call option on an index,  the option is covered if a Portfolio
maintains with its custodian a portfolio of securities substantially replicating
the movement of the index,  or liquid assets equal to the contract value. A call
option  is also  covered  if a  Portfolio  holds a call  on the  same  security,
currency or index as the call written where the exercise  price of the call held
is (i) equal to or less than the  exercise  price of the call  written,  or (ii)
greater than the  exercise  price of the call  written  provided  the  Portfolio
segregates  liquid assets in the amount of the  difference.  The Portfolios will
write put options only if they are "secured" by  segregated  liquid assets in an
amount not less than the  exercise  price of the option at all times  during the
option period.

         A Portfolio's  obligation to sell a security  subject to a covered call
option written by it, or to purchase a security or currency subject to a secured
put option written by it, may be terminated  prior to the expiration date of the
option by the Portfolio's execution of a closing purchase transaction,  which is
effected by purchasing  on an exchange an option of the same series (i.e.,  same
underlying  security or currency,  exercise  price and  expiration  date) as the
option previously  written.  Such a purchase does not result in the ownership of
an option. A closing purchase transaction will ordinarily be effected to realize
a profit on an outstanding option, to prevent an underlying security or currency
from being called, to permit the sale of the underlying  security or currency or
to  permit  the  writing  of a new  option  containing  different  terms on such
underlying  security.  The cost of such a liquidation  purchase plus transaction
costs may be greater  than the premium  received  upon the original  option,  in
which event the Portfolio will have incurred a loss in the transaction. There is
no  assurance  that a liquid  secondary  market  will  exist for any  particular
option. An option writer, unable to effect a closing purchase transaction,  will
not be able to sell  the  underlying  security  or  currency  (in the  case of a
covered  call  option)  or  liquidate  the  segregated  assets (in the case of a
secured  put  option)  until the option  expires  or the  optioned  security  or
currency  is  delivered  upon  exercise  with the result that the writer in such
circumstances  will be subject to the risk of market decline or  appreciation in
the security or currency during such period.

         When a  Portfolio  purchases  an  option,  the  premium  paid  by it is
recorded as an asset of the Portfolio.  When the Portfolio writes an option,  an
amount equal to the net premium (the  premium less the  commission)  received by
the Portfolio is included in the liability section of the Portfolio's  statement
of assets  and  liabilities  as a deferred  credit.  The amount of this asset or
deferred  credit will be  subsequently  marked-to-market  to reflect the current
value of the option purchased or written. The current value of the traded option
is the last sale price or, in the absence of a sale,  the current bid price.  If
an option purchased by the Portfolio expires unexercised, the Portfolio realizes
a loss equal to the premium paid.  If the  Portfolio  enters into a closing sale
transaction  on an option  purchased by it, the Portfolio will realize a gain if
the premium  received by the Portfolio on the closing  transaction  is more than
the premium paid to purchase the option,  or a loss if it is less.  If an option
written by the Portfolio  expires on the  stipulated  expiration  date or if the
Portfolio enters into a closing purchase transaction, it will realize a gain (or
loss if the cost of a  closing  purchase  transaction  exceeds  the net  premium
received when the option is sold) and the deferred credit related to such option
will be  eliminated.  If an option  written by the Portfolio is  exercised,  the
proceeds of the sale will be  increased by the net premium  originally  received
and the Portfolio will realize a gain or loss.

         There  are  several  risks  associated  with  transactions  in  certain
options. For example, there are significant  differences between the securities,
currency  and options  markets  that could  result in an  imperfect  correlation
between  these  markets,   causing  a  given  transaction  not  to  achieve  its
objectives.  In addition,  a liquid  secondary  market for  particular  options,
whether  traded  over-the-counter  or  on a  national  securities  exchange  (an
"Exchange"), may be absent for reasons which include the following: there may be
insufficient trading interest in certain options; restrictions may be imposed by
an Exchange on opening  transactions or closing  transactions  or both;  trading
halts,  suspensions  or  other  restrictions  may be  imposed  with  respect  to
particular classes or series of options or underlying  securities or currencies;
unusual or  unforeseen  circumstances  may  interrupt  normal  operations  on an
Exchange;  the facilities of an Exchange or the Options Clearing Corporation may
not at all times be adequate to handle  current  trading  value;  or one or more
Exchanges could,  for economic or other reasons,  decide or be compelled at some
future date to  discontinue  the trading of options  (or a  particular  class or
series of options),  in which event the secondary market on that Exchange (or in
that class or series of  options)  would  cease to exist,  although  outstanding
options that had been issued by the Options Clearing  Corporation as a result of
trades on that Exchange  would  continue to be  exercisable  in accordance  with
their terms.

         Supranational  Bank Obligations.  The Balanced  Portfolio may invest in
obligations  of  supranational  banks.  Supranational  banks  are  international
banking  institutions  designed or supported by national  governments to promote
economic  reconstruction,  development or trade between nations (e.g., the World
Bank).  Obligations of supranational  banks may be supported by appropriated but
unpaid  commitments  of their member  countries  and there is no assurance  that
these commitments will be undertaken or met in the future.

         Stripped  Securities.  The Balanced  Portfolio  may  purchase  stripped
securities.  The Treasury  Department has facilitated  transfers of ownership of
zero coupon securities by accounting  separately for the beneficial ownership of
particular interest coupon and principal payments on Treasury securities through
the Federal  Reserve  book-entry  record-keeping  system.  The  Federal  Reserve
program as  established  by the  Treasury  Department  is known as  "STRIPS"  or
"Separate  Trading of  Registered  Interest and  Principal of  Securities."  The
Portfolio may purchase  securities  registered in the STRIPS program.  Under the
STRIPS program,  the Portfolio will be able to have its beneficial  ownership of
zero coupon securities recorded directly in the book-entry record-keeping system
in lieu of having to hold  certificates  or other  evidences of ownership of the
underlying U.S. Treasury securities.

         In  addition,  the  Balanced  Portfolio  may  acquire  U.S.  Government
obligations  and their  unmatured  interest  coupons  that  have been  separated
("stripped") by their holder, typically a custodian bank or investment brokerage
firm. Having separated the interest coupons from the underlying principal of the
U.S. Government  obligations,  the holder will resell the stripped securities in
custodial receipt programs with a number of different names, including "Treasury
Income  Growth  Receipts"  ("TIGRs")  and  "Certificate  of Accrual on  Treasury
Securities"  ("CATS").  The  stripped  coupons  are  sold  separately  from  the
underlying principal, which is usually sold at a deep discount because the buyer
receives  only the right to receive a future  fixed  payment on the security and
does not receive any rights to periodic interest (cash) payments. The underlying
U.S.  Treasury  bonds and notes  themselves  are held in book-entry  form at the
Federal Reserve Bank or, in the case of bearer  securities  (i.e.,  unregistered
securities  which are  ostensibly  owned by the bearer or  holder),  in trust on
behalf of the owners. Counsel to the underwriters of these certificates or other
evidences of ownership of U.S.  Treasury  securities  have stated that, in their
opinion,  purchasers of the stripped  securities  most likely will be deemed the
beneficial holders of the underlying U.S. Government obligations for Federal tax
purposes.  The  Trust  is not  aware of any  binding  legislative,  judicial  or
administrative authority on this issue.

         The Prospectus discusses other types of stripped securities that may be
purchased  by  the  Balanced  Portfolio,   including  stripped   mortgage-backed
securities  ("SMBS").  SMBS are usually structured with two or more classes that
receive different proportions of the interest and principal distributions from a
pool of mortgage-backed  obligations.  A common type of SMBS will have one class
receiving  all of the  interest,  while  the  other  class  receives  all of the
principal.  However,  in some  instances,  one class  will  receive  some of the
interest  and most of the  principal  while the other class will receive most of
the interest and the remainder of the principal.  If the underlying  obligations
experience greater than anticipated prepayments of principal,  the Portfolio may
fail to fully  recoup its initial  investment  in these  securities.  The market
value of the class  consisting  entirely  of  principal  payments  generally  is
extremely  volatile in response  to changes in interest  rates.  The yields on a
class of SMBS that  receives all or most of the interest  are  generally  higher
than prevailing market yields on other mortgage-backed obligations because their
cash flow  patterns  are also  volatile  and  there is a risk  that the  initial
investment will not be fully recouped.  SMBS issued by the U.S. Government (or a
U.S.  Government  agency or  instrumentality)  may be  considered  liquid  under
guidelines  established by the Trust's Board of Trustees if they can be disposed
of promptly in the ordinary  course of business at a value  reasonably  close to
that used in the calculation of the net asset value per share.

         Asset-Backed  Securities.  The Balanced  Portfolio  may purchase  asset
backed  securities,  which  are  securities  backed  by  mortgages,  installment
contracts,  credit card  receivables  or other assets.  Asset-backed  securities
represent  interests in "pools" of assets in which payments of both interest and
principal on the securities are made monthly,  thus in effect "passing  through"
monthly  payments made by the  individual  borrowers on the assets that underlie
the  securities,  net  of any  fees  paid  to the  issuer  or  guarantor  of the
securities.  The  average  life  of  asset-backed  securities  varies  with  the
maturities  of  the   underlying   instruments,   and  the  average  life  of  a
mortgage-backed  instrument,  in particular,  is likely to be substantially less
than the original  maturity of the mortgage pools underlying the securities as a
result of mortgage  prepayments.  For this and other  reasons,  an  asset-backed
security's stated maturity may be shortened, and the security's total return may
be difficult to predict precisely.

         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower  than  expected  prepayments  will  decrease,   yield  to  maturity.   In
calculating  the average  weighted  maturity of the fixed income  portion of the
Balanced  Portfolio,  the maturity of  asset-backed  securities will be based on
estimates of average life.

         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.

         Asset-backed  securities acquired by the Balanced Portfolio may include
collateralized  mortgage obligations ("CMOs") issued by private companies.  CMOs
provide  the  holder  with a  specified  interest  in the cash flow of a pool of
underlying  mortgages  or  other  mortgage-backed  securities.  Issuers  of CMOs
ordinarily  elect to be  taxed as  pass-through  entities  known as real  estate
mortgage  investment conduits  ("REMICs").  CMOs are issued in multiple classes,
each with a specified fixed or floating  interest rate and a final  distribution
date.  The relative  payment rights of the various CMO classes may be structured
in a variety of ways. The Portfolio will not purchase  "residual" CMO interests,
which normally exhibit greater price volatility.

         There are a number of  important  differences  among the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by the Government National Mortgage  Association  ("GNMA") include GNMA Mortgage
Pass-Through  Certificates (also known as "Ginnie Maes") which are guaranteed as
to the timely  payment of principal  and interest by GNMA and such  guarantee is
backed by the full faith and credit of the United States. GNMA is a wholly-owned
U.S.  Government   corporation  within  the  Department  of  Housing  and  Urban
Development.  GNMA  certificates  also are supported by the authority of GNMA to
borrow  funds  from the U.S.  Treasury  to make  payments  under its  guarantee.
Mortgage-backed  securities issued by the Federal National Mortgage  Association
("FNMA") include FNMA Guaranteed Mortgage Pass-Through  Certificates (also known
as  "Fannie  Maes")  which are solely  the  obligations  of the FNMA and are not
backed by or entitled to the full faith and credit of the United States, but are
supported  by the right of the  issuer to borrow  from the  Treasury.  FNMA is a
government-sponsored organization owned entirely by private stockholders. Fannie
Maes are  guaranteed as to timely payment of the principal and interest by FNMA.
Mortgage-related securities issued by the Federal Home Loan Mortgage Corporation
("FHLMC")  include  FHLMC  Mortgage  Participation  Certificates  (also known as
"Freddie  Macs" or "PCs").  FHLMC is a corporate  instrumentality  of the United
States,  created  pursuant  to an Act of  Congress,  which is owned  entirely by
Federal Home Loan Banks. Freddie Macs are not guaranteed by the United States or
by any Federal Home Loan Banks and do not constitute a debt or obligation of the
United States or of any Federal Home Loan Bank.  Freddie Macs entitle the holder
to timely  payment of  interest,  which is  guaranteed  by the FHLMC.  The FHLMC
guarantees  either  ultimate  collection  or  timely  payment  of all  principal
payments on the  underlying  mortgage  loans.  When the FHLMC does not guarantee
timely  payment of  principal,  the FHLMC may remit the amount due on account of
its  guarantee of ultimate  payment of principal at any time after default on an
underlying  mortgage,  but in no event  later  than one  year  after it  becomes
payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support payments on these securities.

         Interest Rate Swaps,  Floors and Caps and Currency Swaps.  The Balanced
Portfolio may enter into interest rate swaps or purchase interest rate floors or
caps for hedging purposes and not for  speculation.  Interest rate swaps involve
the exchange by the Portfolio with another party of their respective commitments
to pay or receive  interest,  such as an  exchange  of fixed rate  payments  for
floating rate payments.  The Portfolio will typically use interest rate swaps to
preserve a return on a particular  investment  or portion of its portfolio or to
shorten the effective duration of its portfolio investments.  The purchase of an
interest  rate  floor or cap  entitles  the  purchaser  to receive  payments  of
interest  on a notional  principal  amount  from the  seller,  to the extent the
specified  index falls below (floor) or exceeds (cap) a  predetermined  interest
rate.  The  Portfolio  will only enter into interest rate swaps or interest rate
floor or cap  transactions  on a net basis;  i.e.,  the two payment  streams are
netted out, with the Portfolio receiving or paying, as the case may be, only the
net amount of the two payments.

         The International  Equity Index and International Growth Portfolios may
enter  into  currency  swaps,  which  involve  the  exchange  of the rights of a
Portfolio and another party to make or receive payments in specified currencies.
Currency swaps usually involve the delivery of the entire principal value of one
designated currency in exchange for the other designated currency.

         Inasmuch as interest rate and currency  swaps are entered into for good
faith hedging purposes,  the Trust, The Northern Trust Company  ("Northern") and
Northern  Trust  Quantitative  Advisors,  Inc.  ("NTQA" and,  collectively  with
Northern,  the  "Investment  Advisers")  believe that such  transactions  do not
constitute senior securities as defined in the 1940 Act and,  accordingly,  will
not treat them as being subject to the Portfolios' borrowing  restrictions.  The
net  amount  of the  excess,  if any,  of a  Portfolio's  obligations  over  its
entitlements  with respect to interest rate or currency swaps will be accrued on
a daily basis and an amount of liquid assets having an aggregate net asset value
at least equal to such accrued excess will be segregated by the Portfolio.

         The Balanced Portfolio will not enter into an interest rate swap, floor
or cap transaction,  and the International Equity Index and International Growth
Portfolios will not enter into currency swap  transactions  unless the unsecured
commercial paper,  senior debt or the  claims-paying  ability of the other party
thereto is rated either A or A-l or better by Standard & Poor's  Ratings  Group,
Inc. ("S&P"),  Duff & Phelps Credit Rating Co. ("Duff") or Fitch IBCA ("Fitch"),
or A or P-1 or better by Moody's Investors Service, Inc.  ("Moody's").  If there
is a default by the other party to such  transaction,  the Portfolios  will have
contractual remedies pursuant to the agreements related to the transaction.  The
swap market has grown substantially in recent years with a large number of banks
and investment  banking firms acting both as principals and as agents  utilizing
standardized  swap  documentation.  As a  result,  the swap  market  has  become
relatively liquid in comparison with markets for other similar instruments which
are traded in the interbank market.

         Equity Swaps.  Each  Portfolio may enter into equity swap  contracts to
invest in a market  without owning or taking  physical  custody of securities in
circumstances  in which direct  investment is restricted for legal reasons or is
otherwise  impracticable.  Equity swaps may also be used for hedging purposes or
to seek to increase total return.  The  counterparty  to an equity swap contract
will typically be a bank, investment banking firm or broker/dealer.  Equity swap
contracts may be structured in different ways. For example,  a counterparty  may
agree to pay the Portfolio the amount,  if any, by which the notional  amount of
the equity swap contract  would have  increased in value had it been invested in
particular  stocks (or an index of stocks),  plus the dividends  that would have
been received on those stocks. In these cases, the Portfolio may agree to pay to
the  counterparty  the amount,  if any, by which that notional amount would have
decreased in value had it been invested in the stocks.  Therefore, the return to
the  Portfolio  on any equity  swap  contract  should be the gain or loss on the
notional  amount  plus  dividends  on the stocks less the  interest  paid by the
Portfolio  on the notional  amount.  In other cases,  the  counterparty  and the
Portfolio  may each agree to pay the other the  difference  between the relative
investment  performances that would have been achieved if the notional amount of
the equity swap  contract had been  invested in different  stocks (or indices of
stocks).

         A  Portfolio  will enter into equity  swaps only on a net basis,  which
means that the two payment streams are netted out, with the Portfolio  receiving
or paying, as the case may be, only the net amount of the two payments. Payments
may be made at the conclusion of an equity swap contract or periodically  during
its term.  Equity  swaps do not involve  the  delivery  of  securities  or other
underlying assets. Accordingly, the risk of loss with respect to equity swaps is
limited  to the  net  amount  of  payments  that a  Portfolio  is  contractually
obligated to make. If the other party to an equity swap defaults,  a Portfolio's
risk of loss  consists  of the net amount of  payments  that such  Portfolio  is
contractually  entitled to receive,  if any. Inasmuch as these  transactions are
entered  into for hedging  purposes or are offset by  segregated  cash or liquid
assets to cover the  Portfolios'  potential  exposure,  the  Portfolios  and the
Investment  Advisers  believe that such  transactions  do not constitute  senior
securities  under the 1940 Act and,  accordingly,  will not treat  them as being
subject to a Portfolio's borrowing restrictions.

         The  Portfolios  will not enter into any swap  transactions  unless the
unsecured  commercial paper,  senior debt or claims-paying  ability of the other
party is rated either A or A-1 or better by S&P,  Duff or Fitch,  or A or P-1 or
better  by  Moody's.  If  there  is a  default  by the  other  party  to  such a
transaction,  a  Portfolio  will  have  contractual  remedies  pursuant  to  the
agreements related to the transaction.

         The use of equity swaps is a highly specialized activity which involves
investment  techniques and risks  different from those  associated with ordinary
portfolio securities  transactions.  If the Investment Advisers are incorrect in
their  forecasts of market  values,  the  investment  performance of a Portfolio
would be less  favorable  than it would have been if this  investment  technique
were not used.

         Futures  Contracts and Related  Options.  Each  Portfolio may invest in
futures  contracts  and may  purchase  and sell call and put  options on futures
contracts for hedging  purposes,  for speculative  purposes (to seek to increase
total return),  or for liquidity  management  purposes.  When used as a hedge, a
Portfolio  may sell a  futures  contract  in order to offset a  decrease  in the
market value of its  portfolio  securities  that might  otherwise  result from a
market decline or currency exchange  fluctuations.  A Portfolio may do so either
to hedge the value of its  portfolio  of  securities  as a whole,  or to protect
against  declines,  occurring prior to sales of securities,  in the value of the
securities to be sold.  Conversely,  a Portfolio may purchase a futures contract
as a hedge in anticipation of purchases of securities.  In addition, a Portfolio
may utilize  futures  contracts in anticipation of changes in the composition of
its portfolio  holdings.  For a detailed  description  of futures  contracts and
related options, see Appendix B to this Additional Statement.

         Real Estate  Investment  Trusts.  The Small Company Index and the Small
Company  Growth  Portfolios may invest in equity real estate  investment  trusts
("REITs")  that  constitute a part of the Russell 2000 Small Stock Index.  REITs
pool  investors'  funds for  investment  primarily  in  commercial  real  estate
properties. Investments in REITs may subject a Portfolio to certain risks. REITs
may be affected by changes in the value of the underlying  property owned by the
trust.  REITs  are  dependent  upon  specialized  management  skill,  may not be
diversified and are subject to the risks of financing  projects.  REITs are also
subject to heavy cash flow dependency,  defaults by borrowers,  self liquidation
and the  possibility  of failing to qualify  for the  beneficial  tax  treatment
available to REITs under the Internal  Revenue Code of 1986, as amended,  and to
maintain  exemption  from the 1940 Act. As a shareholder  in a REIT, a Portfolio
would bear,  along with other  shareholders,  its pro rata portion of the REIT's
operating  expenses.  These  expenses  would be in addition to the  advisory and
other expenses a Portfolio bears directly in connection with its own operations.

         Securities Lending.  Collateral for loans of portfolio  securities made
by a  Portfolio  may consist of cash,  cash  equivalents,  securities  issued or
guaranteed by the U.S. Government or its agencies or irrevocable bank letters of
credit (or any combination thereof). The borrower of securities will be required
to maintain the market value of the collateral at not less than the market value
of the loaned  securities,  and such value will be  monitored  on a daily basis.
When a Portfolio  lends its  securities,  it continues to receive  dividends and
interest on the securities  loaned and may  simultaneously  earn interest on the
investment of the cash collateral. Although voting rights, or rights to consent,
attendant to securities on loan pass to the borrower,  such loans will be called
so that the securities may be voted by a Portfolio if a material event affecting
the investment is to occur.

         Forward  Commitments,   When-Issued  Securities  and  Delayed  Delivery
Transactions.  When a Portfolio purchases  securities on a when-issued,  delayed
delivery or forward commitment basis, the Portfolio will segregate liquid assets
until three days prior to the settlement date having a value (determined  daily)
at least equal to the amount of the Portfolio's  purchase  commitments,  or will
otherwise  cover  its  position.  In the case of a  forward  commitment  to sell
portfolio  securities,  the Portfolio  will  segregate the portfolio  securities
themselves.  These  procedures  are designed to ensure that the  Portfolio  will
maintain  sufficient  assets  at  all  times  to  cover  its  obligations  under
when-issued purchases, forward commitments and delayed delivery transactions.

         Commercial Paper, Bankers'  Acceptances,  Certificates of Deposit, Time
Deposits  and Bank  Notes.  Commercial  paper  represents  short-term  unsecured
promissory  notes  issued in  bearer  form by banks or bank  holding  companies,
corporations  and finance  companies.  Certificates  of deposit  are  negotiable
certificates  issued against funds deposited in a commercial bank for a definite
period  of time  and  earning  a  specified  return.  Bankers'  acceptances  are
negotiable  drafts  or bills of  exchange,  normally  drawn  by an  importer  or
exporter  to pay for  specific  merchandise,  which  are  "accepted"  by a bank,
meaning, in effect, that the bank  unconditionally  agrees to pay the face value
of the instrument on maturity.  Fixed time deposits are bank obligations payable
at a stated  maturity  date and bearing  interest  at a fixed  rate.  Fixed time
deposits may be withdrawn on demand by the investor, but may be subject to early
withdrawal  penalties  that  vary  depending  upon  market  conditions  and  the
remaining maturity of the obligation.  There are no contractual  restrictions on
the right to transfer a  beneficial  interest in a fixed time deposit to a third
party.  Bank notes rank  junior to deposit  liabilities  of banks and pari passu
with other senior,  unsecured obligations of the bank. Bank notes are classified
as  "other  borrowings"  on a bank's  balance  sheet,  while  deposit  notes and
certificates  of deposit are classified as deposits.  Bank notes are not insured
by the Federal Deposit Insurance Corporation or any other insurer. Deposit notes
are insured by the Federal Deposit  Insurance  Corporation only to the extent of
$100,000 per depositor per bank.

         Each Portfolio may invest a portion of its assets in the obligations of
foreign banks and foreign branches of domestic banks.  Such obligations  include
Eurodollar  Certificates of Deposit  ("ECDs") which are U.S.  dollar-denominated
certificates  of deposit issued by offices of foreign and domestic banks located
outside the United  States;  Eurodollar  Time Deposits  ("ETDs")  which are U.S.
dollar-denominated  deposits  in a foreign  branch  of a U.S.  bank or a foreign
bank;  Canadian Time Deposits  ("CTDs") which are  essentially  the same as ETDs
except they are issued by Canadian offices of major Canadian banks; Schedule Bs,
which are obligations  issued by Canadian branches of foreign or domestic banks;
Yankee Certificates of Deposit ("Yankee CDs") which are U.S.  dollar-denominated
certificates  of deposit  issued by a U.S.  branch of a foreign bank and held in
the United States; and Yankee Bankers' Acceptances ("Yankee Bas") which are U.S.
dollar-denominated  bankers'  acceptances  issued by a U.S.  branch of a foreign
bank and held in the United States.

         Convertible  Securities.  Convertible  securities entitle the holder to
receive interest paid or accrued on debt or the dividend paid on preferred stock
until the convertible securities mature or are redeemed, converted or exchanged.
Prior to conversion,  convertible  securities  have  characteristics  similar to
ordinary debt securities in that they normally provide a stable stream of income
with  generally  higher yields than those of common stock of the same or similar
issuers.  Convertible  securities rank senior to common stock in a corporation's
capital   structure   and  therefore   generally   entail  less  risk  than  the
corporation's  common  stock,  although the extent to which such risk is reduced
depends in large measure upon the degree to which the convertible security sells
above its value as a fixed income security.

         In selecting  convertible  securities,  the investment  management team
will consider, among other factors: an evaluation of the creditworthiness of the
issuers of the  securities;  the  interest or dividend  income  generated by the
securities;  the potential for capital  appreciation  of the  securities and the
underlying  common  stocks;  the  prices  of the  securities  relative  to other
comparable  securities  and  to  the  underlying  common  stocks;   whether  the
securities  are  entitled to the benefits of sinking  funds or other  protective
conditions;  diversification of Portfolio  securities as to issuers; and whether
the securities are rated by a rating agency and, if so, the ratings assigned.

         The value of convertible  securities is a function of their  investment
value  (determined by yield in comparison with the yields of other securities of
comparable  maturity and quality that do not have a  conversion  privilege)  and
their  conversion  value (their worth,  at market value,  if converted  into the
underlying  common  stock).  The investment  value of convertible  securities is
influenced by changes in interest  rates,  with  investment  value  declining as
interest rates  increase and  increasing as interest  rates decline,  and by the
credit  standing  of the  issuer  and other  factors.  The  conversion  value of
convertible  securities  is  determined  by the market  price of the  underlying
common stock. If the conversion  value is low relative to the investment  value,
the  price  of the  convertible  securities  is  governed  principally  by their
investment  value. To the extent the market price of the underlying common stock
approaches  or  exceeds  the  conversion  price,  the  price of the  convertible
securities  will be  increasingly  influenced  by  their  conversion  value.  In
addition,  convertible  securities  generally  sell  at  a  premium  over  their
conversion  value determined by the extent to which investors place value on the
right to  acquire  the  underlying  common  stock  while  holding  fixed  income
securities.

         Capital  appreciation for the Portfolios may result from an improvement
in the credit  standing of an issuer whose  securities are held in the Portfolio
or from a  general  lowering  of  interest  rates,  or a  combination  of  both.
Conversely, a reduction in the credit standing of an issuer whose securities are
held by the Portfolio or a general increase in interest rates may be expected to
result in capital depreciation to the Portfolio.

         In general,  investments  in lower quality  convertible  securities are
subject  to a  significant  risk of a change in the credit  rating or  financial
condition of the issuing entity. Investments in convertible securities of medium
or lower quality are also likely to be subject to greater market fluctuation and
to greater risk of loss of income and principal due to default than  investments
of  higher  quality  fixed-income  securities.  Such  lower  quality  securities
generally  tend to reflect  short-term  corporate and market  developments  to a
greater extent than higher quality securities,  which react more to fluctuations
in the general level of interest  rates. A Portfolio that invests in convertible
securities will generally reduce risk to the investor by diversification, credit
analysis and attention to current developments in trends of both the economy and
financial  markets.  However,  while  diversification  reduces  the  effect on a
Portfolio  of any single  investment,  it does not reduce  the  overall  risk of
investing in lower quality securities.

         Risks  Related  to  Small  Company  Securities.  While  the  Investment
Advisers  believe that smaller  companies can provide  greater growth  potential
than larger,  more mature firms,  investing in the  securities of such companies
also involves greater risk,  portfolio price volatility and cost.  Historically,
small  capitalization  stocks,  which will be the Small  Company Index and Small
Company Growth Portfolios' primary investments, and stocks of recently organized
companies,  in which the Portfolios may also invest,  have been more volatile in
price than the larger  capitalization  stocks  included in the Standard & Poor's
500(R) Composite Stock Price Index (the "S&P 500 Index").  Among the reasons for
this greater  price  volatility  are the lower degree of market  liquidity  (the
securities of companies with small stock market  capitalizations  may trade less
frequently and in limited volume) and the greater sensitivity of small companies
to changing  economic  conditions.  For example,  these companies are associated
with higher  investment risk due to the greater business risks of small size and
limited  product  lines,  markets,   distribution  channels  and  financial  and
managerial resources.

         The  values  of  small  company   stocks  will   frequently   fluctuate
independently  of the values of larger company stocks.  Small company stocks may
decline in price as large  company  stock prices rise, or rise in price as large
company stock prices decline. You should,  therefore,  expect that the net asset
value of the Small  Company Index and Small Company  Growth  Portfolios'  shares
will be more  volatile  than,  and may fluctuate  independently  of, broad stock
market indices such as the S&P 500 Index.

         The additional  costs  associated with the acquisition of small company
stocks include  brokerage  costs,  market impact costs (that is, the increase in
market prices which may result when the Small  Company Index  Portfolio or Small
Company Growth  Portfolio  purchases  thinly traded stock) and the effect of the
"bid-ask"  spread in small  company  stocks.  These  costs  will be borne by all
shareholders and may negatively impact investment performance.

         Insurance  Funding  Agreements.  The Balanced  Portfolio  may invest in
insurance funding agreements  ("IFAs").  An IFA is normally a general obligation
of the issuing insurance company and not a separate account.  The purchase price
paid for an IFA becomes part of the general assets of the insurance company, and
the contract is paid from the company's general assets.  Generally, IFAs are not
assignable  or  transferable  without the  permission  of the issuing  insurance
companies,  and an active secondary market in IFAs may not exist. IFAs therefore
will be subject to the Portfolio's  limitation on illiquid  investments when the
Portfolio may not demand payment of the principal amount within seven days and a
reliable trading market is absent.

         Zero Coupon,  Pay-in-Kind and Capital Appreciation Bonds. To the extent
consistent  with their  respective  investment  objectives,  the  Portfolios may
invest in zero coupon bonds,  capital appreciation bonds and pay-in-kind ("PIK")
securities.  Zero  coupon and  capital  appreciation  bonds are debt  securities
issued or sold at a discount  from their face value and which do not entitle the
holder to any  periodic  payment of  interest  prior to  maturity or a specified
date. The original issue discount  varies  depending on the time remaining until
maturity or cash payment date,  prevailing  interest rates, the liquidity of the
security and the perceived  credit quality of the issuer.  These securities also
may take the form of debt  securities that have been stripped of their unmatured
interest   coupons,   the  coupons   themselves  or  receipts  or   certificates
representing  interests in such stripped debt obligations or coupons. The market
prices of zero  coupon  bonds,  capital  appreciation  bonds and PIK  securities
generally  are  more  volatile  than  the  market  prices  of  interest  bearing
securities  and are likely to respond to a greater degree to changes in interest
rates than interest  bearing  securities  having  similar  maturities and credit
quality.

         PIK securities may be debt obligations or preferred shares that provide
the issuer with the option of paying  interest or dividends on such  obligations
in cash or in the form of  additional  securities  rather than cash.  Similar to
zero coupon bonds, PIK securities are designed to give an issuer  flexibility in
managing cash flow. PIK securities that are debt securities can either be senior
or subordinated debt and generally trade flat (i.e.,  without accrued interest).
The trading price of PIK debt securities  generally reflects the market value of
the underlying debt plus an amount representing  accrued interest since the last
interest payment.

         Zero  coupon  bonds,  capital  appreciation  bonds  and PIK  securities
involve the  additional  risk that,  unlike  securities  that  periodically  pay
interest  to  maturity,  the  Portfolio  will  realize no cash until a specified
future  payment  date  unless a portion of such  securities  is sold and, if the
issuer of such securities defaults, the Portfolio may obtain no return at all on
its investment.  In addition, even though such securities do not provide for the
payment of current  interest in cash, the Portfolio is  nonetheless  required to
accrue  income  on such  investments  for each  taxable  year and  generally  is
required to distribute such accrued amounts (net of deductible expenses, if any)
to avoid being subject to tax. Because no cash is generally received at the time
of the  accrual,  the  Portfolio  may be required to liquidate  other  portfolio
securities  to  obtain  sufficient  cash to  satisfy  Federal  tax  distribution
requirements applicable to the Portfolio.

         Variable and Floating  Rate  Instruments.  With respect to the variable
and  floating  rate  instruments  that may be  acquired by the  Portfolios,  the
investment management team will consider the earning power, cash flows and other
liquidity  ratios of the issuers and guarantors of such  instruments and, if the
instruments are subject to demand features,  will monitor their financial status
and ability to meet payment on demand. Where necessary to ensure that a variable
or floating rate instrument  meets the  Portfolios'  quality  requirements,  the
issuer's  obligation to pay the principal of the instrument will be backed by an
unconditional  bank letter or line of credit,  guarantee or  commitment to lend.

         Variable and  floating  rate  instruments  eligible for purchase by the
Portfolios  include  variable  amount  master  demand  notes,  which  permit the
indebtedness   thereunder   to  vary  in  addition  to  providing  for  periodic
adjustments  in the interest  rate,  and  leveraged  inverse  floating rate debt
instruments ("inverse floaters"). The interest rate on an inverse floater resets
in the opposite  direction from the market rate of interest to which the inverse
floater is indexed.  An inverse floater may be considered to be leveraged to the
extent that its interest  rate varies by a magnitude  that exceeds the magnitude
of the  change in the index rate of  interest.  The  higher  degree of  leverage
inherent in inverse  floaters is  associated  with greater  volatility  in their
market values.  Accordingly,  the duration of an inverse  floater may exceed its
stated  final  maturity.  The  Portfolios  may deem the maturity of variable and
floating rate instruments to be less than their stated maturities based on their
variable and floating rate features and/or their put features.  Unrated variable
and floating rate instruments  will be determined by the Investment  Advisers to
be of comparable  quality at the time of purchase to rated instruments which may
be purchased by the Portfolios.

         Variable and floating rate instruments  including inverse floaters held
by a Portfolio  will be subject to the  Portfolio's  15%  limitation on illiquid
investments, absent a reliable trading market, when the Portfolio may not demand
payment of the principal amount within seven days.

         Repurchase  Agreements.  Each Portfolio may agree to purchase portfolio
securities  from  financial  institutions  subject to the seller's  agreement to
repurchase  them  at  a  mutually  agreed  upon  date  and  price   ("repurchase
agreements").  Repurchase  agreements  are considered to be loans under the 1940
Act.  Although  the  securities  subject  to a  repurchase  agreement  may  bear
maturities  exceeding one year,  settlement  for the  repurchase  agreement will
never be more than one year after the Portfolio's  acquisition of the securities
and  normally  will be within a shorter  period of time.  Securities  subject to
repurchase  agreements are held either by the Trust's  custodian or subcustodian
(if any), or in the Federal Reserve/Treasury Book-Entry System. The seller under
a repurchase  agreement will be required to maintain the value of the securities
subject to the agreement in an amount  exceeding the repurchase price (including
accrued interest). Default by the seller would, however, expose the Portfolio to
possible loss because of adverse  market action or delay in connection  with the
disposition of the underlying obligations.

         Reverse  Repurchase  Agreements.  Each  Portfolio  may borrow  funds by
selling  portfolio  securities  to  financial  institutions  such as  banks  and
broker/dealers  and agreeing to repurchase them at a mutually specified date and
price ("reverse repurchase agreements").  The Portfolios may use the proceeds of
reverse repurchase  agreements to purchase other securities either maturing,  or
under  an  agreement  to  resell,  on a date  simultaneous  with or prior to the
expiration of the reverse repurchase  agreement.  Reverse repurchase  agreements
are  considered  to  be  borrowings  under  the  1940  Act.  Reverse  repurchase
agreements  involve the risk that the market value of the securities sold by the
Portfolios  may decline below the  repurchase  price.  The  Portfolios  will pay
interest on amounts obtained pursuant to a reverse repurchase  agreement.  While
reverse  repurchase  agreements are  outstanding,  the Portfolios will segregate
liquid assets in an amount at least equal to the market value of the securities,
plus accrued interest, subject to the agreement.

         Investment Companies. With respect to the investments of the Portfolios
in the  securities  of other  investment  companies,  such  investments  will be
limited so that,  as  determined  after a purchase is made,  either (a) not more
than 3% of the total outstanding stock of such investment  company will be owned
by a Portfolio, the Trust as a whole and their affiliated persons (as defined in
the 1940  Act);  or (b) (i) not more than 5% of the value the total  assets of a
Portfolio will be invested in the securities of any one investment company, (ii)
not more than 10% of the  value of its  total  assets  will be  invested  in the
aggregate in securities of investment  companies as a group,  and (iii) not more
than 3% of the  outstanding  voting stock of any one investment  company will be
owned by the Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolios may not be obligated to redeem such securities in an amount exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.

     If required by the 1940 Act, each  Portfolio  expects to vote the shares of
other  investment  companies  that are held by it in the same  proportion as the
vote of all other holders of such securities.

         A  Portfolio  may  invest all or  substantially  all of its assets in a
single open-end investment company or series thereof with substantially the same
investment  objective,  policy and restrictions as the Portfolio.  However, each
Portfolio  currently  intends to limit its  investments in securities  issued by
other investment companies to the extent described above. A Portfolio may adhere
to more  restrictive  limitations  with respect to its investments in securities
issued by other  investment  companies if required by the SEC or deemed to be in
the best interests of the Trust.

         As noted in the Prospectus,  the  International  Equity Index Portfolio
may  invest  in  World  Equity  Benchmark  Shares  ("WEBS"),  Standard  & Poor's
Depository  Receipts  ("SPDRs")  and  similar  securities  of  other  investment
companies, subject to the restrictions set forth above.

         WEBS are shares of an investment company that invests substantially all
of its assets in securities included in the Morgan Stanley Capital International
Index ("MSCI") indices for specified countries.  WEBS are listed on the American
Stock Exchange (the "AMEX"),  and were initially  offered to the public in 1996.
The market  prices of WEBS are  expected to fluctuate  in  accordance  with both
changes  in the net asset  values of their  underlying  indices  and  supply and
demand of WEBS on the  AMEX.  To date WEBS  have  traded  at  relatively  modest
discounts and premiums to their net asset values.  However,  WEBS have a limited
operating  history,  and information is lacking regarding the actual performance
and trading  liquidity  of WEBS for  extended  periods or over  complete  market
cycles.  In addition,  there is no assurance that the  requirements  of the AMEX
necessary to maintain the listing of WEBS will continue to be met or will remain
unchanged.  In the event substantial market or other disruptions  affecting WEBS
should occur in the future, the liquidity and value of the International  Equity
Index Portfolio's shares could also be substantially and adversely affected, and
the  Portfolio's  ability  to  provide  investment  results   approximating  the
performance  of  securities  in the  EAFE  Index  could  be  impaired.  If  such
disruptions were to occur, the Portfolio could be required to reconsider the use
of WEBS as part of its investment strategy.

         SPDRs are  interests  in a unit  investment  trust  ("UIT") that may be
obtained from the UIT or purchased in the secondary  market (SPDRs are listed on
the AMEX). The UIT will issue SPDRs in aggregations known as "Creation Units" in
exchange for a "Portfolio  Deposit"  consisting of (a) a portfolio of securities
substantially  similar to the component  securities ("Index  Securities") of the
S&P 500 Index,  (b) a cash payment  equal to a pro rata portion of the dividends
accrued on the UIT's portfolio securities since the last dividend payment by the
UIT,  net of  expenses  and  liabilities,  and  (c) a  cash  payment  or  credit
("Balancing  Amount")  designed to equalize the net asset value of the S&P Index
and the net asset value of a Portfolio Deposit.

         SPDRs are not individually  redeemable,  except upon termination of the
UIT. To redeem,  the Portfolio must  accumulate  enough SPDRs to  reconstitute a
Creation Unit. The liquidity of small holdings of SPDRs, therefore,  will depend
upon the existence of a secondary  market.  Upon  redemption of a Creation Unit,
the Portfolio will receive Index  Securities and cash identical to the Portfolio
Deposit required of an investor wishing to purchase a Creation Unit that day.

         The price of SPDRs is derived from and based upon the  securities  held
by the UIT. Accordingly, the level of risk involved in the purchase or sale of a
SPDR is similar to the risk  involved  in the  purchase  or sale of  traditional
common stock,  with the exception that the pricing  mechanism for SPDRs is based
on a basket of stocks.  Disruptions in the markets for the securities underlying
SPDRs purchased or sold by the International Equity Index Portfolio could result
in losses on SPDRs.  Trading in SPDRs  involves  risks  similar  to those  risks
involved in the writing of options on securities.

         Risks Related to Lower-Rated  Securities.  While any investment carries
some risk,  certain risks associated with  lower-rated  securities are different
than those for investment-grade  securities. The risk of loss through default is
greater  because  lower-rated  securities  are usually  unsecured  and are often
subordinate to an issuer's other obligations. Additionally, the issuers of these
securities  frequently  have high debt  levels  and are thus more  sensitive  to
difficult  economic  conditions,  individual  corporate  developments and rising
interest rates. Consequently,  the market price of these securities may be quite
volatile and may result in wider  fluctuations  of a Portfolio's net asset value
per share.

         There  remains  some  uncertainty  about the  performance  level of the
market  for   lower-rated   securities   under   adverse   market  and  economic
environments.  An economic  downturn or increase in interest  rates could have a
negative  impact on both the market for lower-rated  securities  (resulting in a
greater number of bond defaults) and the value of lower-rated securities held in
the portfolio of investments.

         The  economy  and  interest  rates can  affect  lower-rated  securities
differently  than other  securities.  For  example,  the  prices of  lower-rated
securities  are  more  sensitive  to  adverse  economic  changes  or  individual
corporate  developments  than are the  prices of  higher-rated  investments.  In
addition,  during an  economic  downturn or period in which  interest  rates are
rising   significantly,   highly  leveraged  issuers  may  experience  financial
difficulties,  which, in turn,  would adversely  affect their ability to service
their principal and interest payment obligations,  meet projected business goals
and obtain additional financing.

         If an issuer of a security  defaults,  a Portfolio may incur additional
expenses to seek recovery.  In addition,  periods of economic  uncertainty would
likely  result in  increased  volatility  for the market  prices of  lower-rated
securities as well as a Portfolio's net asset value. In general, both the prices
and yields of lower-rated securities will fluctuate.

         In certain  circumstances it may be difficult to determine a security's
fair value due to a lack of reliable objective information. Such instances occur
where  there is not an  established  secondary  market for the  security  or the
security is lightly traded.  As a result, a Portfolio's  valuation of a security
and the price it is  actually  able to obtain when it sells the  security  could
differ.

         Adverse  publicity  and investor  perceptions,  whether or not based on
fundamental  analysis,  may  decrease  the value and  liquidity  of  lower-rated
securities held by a Portfolio,  especially in a thinly traded market.  Illiquid
or restricted  securities held by a Portfolio may involve  special  registration
responsibilities,  liabilities and costs,  and could involve other liquidity and
valuation difficulties.

         The ratings of S&P,  Moody's,  Duff and Fitch  evaluate the safety of a
lower-rated  security's  principal  and  interest  payments,  but do not address
market  value risk.  Because the ratings of the rating  agencies  may not always
reflect current  conditions and events,  in addition to using recognized  rating
agencies and other sources,  the Investment  Advisers perform their own analysis
of the issuers whose lower-rated securities the Portfolios purchase.  Because of
this, a  Portfolio's  performance  may depend more on their own credit  analysis
than is the case of mutual funds investing in higher-rated securities.

         In selecting lower-rated  securities,  the Investment Advisers consider
factors such as those relating to the  creditworthiness of issuers,  the ratings
and performance of the securities,  the protections  afforded the securities and
the diversity of a Portfolio's  investment  portfolio.  The Investment  Advisers
monitor  the issuers of  lower-rated  securities  held by a Portfolio  for their
ability to make  required  principal  and  interest  payments,  as well as in an
effort to control the liquidity of the Portfolio so that it can meet  redemption
requests.

         Yields and Ratings.  The yields on certain  obligations,  including the
instruments in which the  Portfolios  may invest,  are dependent on a variety of
factors,  including  general  market  conditions,  conditions in the  particular
market  for the  obligation,  financial  condition  of the  issuer,  size of the
offering,  maturity of the obligation  and ratings of the issue.  The ratings of
S&P,  Moody's,  Duff,  Fitch and  Thomson  Bank Watch  ("TBW")  represent  their
respective opinions as to the quality of the obligations they undertake to rate.
Ratings,  however,  are  general  and are not  absolute  standards  of  quality.
Consequently,  obligations with the same rating,  maturity and interest rate may
have different  market prices.  For a more complete  discussion of ratings,  see
Appendix A to this Additional Statement.

         Subject to the limitations stated in the Prospectus, if a security held
by a Portfolio  undergoes a rating revision,  the Portfolio may continue to hold
the security if the Investment Advisers determine such retention is warranted.

         Stock  Indices.  The S&P 500  Index  is a market  value-weighted  index
consisting of 500 common stocks which are traded on the New York Stock Exchange,
AMEX and the Nasdaq  National  Market  System and  selected by Standard & Poor's
Corporation  ("Standard & Poor's") through a detailed screening process starting
on a macro-economic level and working toward a micro-economic level dealing with
company-specific    information   such   as   market   value,   industry   group
classification,  capitalization and trading activity.  Standard & Poor's primary
objective for the S&P 500 Index is to be the performance  benchmark for the U.S.
equity markets.  The companies chosen for inclusion in the S&P 500 Index tend to
be leaders in important industries within the U.S. economy.  However,  companies
are not selected by Standard & Poor's for inclusion because they are expected to
have superior stock price performance relative to the market in general or other
stocks in  particular.  Standard & Poor's makes no  representation  or warranty,
implied or express,  to  purchasers  of Stock Index Fund shares or any member of
the public regarding the advisability of investing in the Equity Index Portfolio
or the ability of the S&P 500 Index to track general  stock market  performance.
As of November 30, 1999,  the  approximate  market  capitalization  range of the
companies  included  in the S&P 500 Index was between  $395  million and $464.69
billion.

         The  Standard & Poor's  Midcap 400 Stock Index ("S&P MidCap 400 Index")
is a  market-weighted  index  composed of 400 common stocks chosen by Standard &
Poor's for market size, liquidity and industry group representation. The purpose
of  the  S&P  MidCap  400  Index  is  to  represent  the   performance   of  the
medium-capitalization  sector of the U.S. securities market.  Medium capitalized
stocks which are included in the S&P 500 Index are excluded  from the S&P MidCap
400 Index.  Except for a limited number of Canadian  securities,  the S&P MidCap
400  does  not  include  foreign  securities.  As  of  November  30,  1999,  the
approximate  market  capitalization  range of the companies  included in the S&P
MidCap 400 Index was between $195 million and $23.394 billion.


         The Russell 2000 Index is a market value-weighted index composed of the
stocks of the  smallest  2000  companies  in the Russell  3000  Index,  which is
composed of the stocks of 3000 large U.S.  domiciled  companies (based on market
capitalization)  that represent  approximately 98% of the investable U.S. equity
markets.  Because of its emphasis on the smallest  2000  companies,  the Russell
2000 Index represents approximately 8% of the total market capitalization of the
Russell 3000 Index.  As of November 30, 1999, the average market  capitalization
of the  companies  included in the Russell 2000 Index was  approximately  $570.0
million. The Russell 2000 Index is reconstituted  annually to reflect changes in
market  capitalization.  The primary  criteria  used by Frank  Russell & Company
("Russell")  to determine the initial list of securities  eligible for inclusion
in the Russell  3000 Index (and  accordingly,  the Russell  2000 Index) is total
market  capitalization  adjusted for large private holdings and cross-ownership.
However, companies are not selected by Russell for inclusion in the Russell 2000
Index  because  they are  expected  to have  superior  stock  price  performance
relative to the market in general or other stocks in  particular.  Russell makes
no  representation or warranty,  implied or express,  to purchasers of Small Cap
Index or Small Cap Growth Fund shares or any member of the public  regarding the
advisability  of  investing in the Fund or the ability of the Russell 2000 Index
to track general market performance of small capitalization stocks.

         Relative Value Approach. In buying and selling securities for the fixed
income portion of the Balanced Portfolio,  the investment management team uses a
relative  value  approach.  This  approach  involves an analysis of economic and
market  information,  including  economic  growth rates,  interest and inflation
rates,  deficit levels, the shape of the yield curve, sector and quality spreads
and risk premiums.  It also involves the use of proprietary  valuation models to
analyze and compare expected returns and assumed risks. Under the relative value
approach,  the investment  management team will emphasize particular  securities
and  particular  types of  securities  that the team  believes  will  provide  a
favorable return in light of these risks.

         Tracking  Variance.  As discussed in the Prospectus,  the Equity Index,
Small Company Index and International Equity Index Portfolios are subject to the
risk of tracking variance. Tracking variance may result from share purchases and
redemptions,  transaction costs, expenses and other factors. Share purchases and
redemptions  may  necessitate the purchase and sale of securities by a Portfolio
and the  resulting  transaction  costs which may be  substantial  because of the
number and the characteristics of the securities held. In addition,  transaction
costs are incurred  because  sales of  securities  received in  connection  with
spin-offs and other corporate  reorganizations are made to conform a Portfolio's
holdings with its investment objective.  Tracking variance may also occur due to
factors  such as the size of a  Portfolio,  the  maintenance  of a cash  reserve
pending  investment  or to  meet  expected  redemptions,  changes  made  in  the
Portfolio's  designated  Index or the manner in which the Index is calculated or
because the indexing and investment  approach of the Investment Adviser does not
produce the intended goal of the  Portfolio.  Tracking  variance is monitored by
the Investment  Adviser at least  quarterly.  In the event the  performance of a
Portfolio is not  comparable to the  performance of its  designated  Index,  the
Board  of  Trustees  will  evaluate  the  reasons  for  the  deviation  and  the
availability of corrective measures.  If substantial  deviation in a Portfolio's
performance were to continue for extended periods, it is expected that the Board
of Trustees would consider  recommending to shareholders possible changes to the
Portfolio's investment objective.

         The Small  Company  Index and  International  Equity  Index  Portfolios
require the payment of an additional  transaction  fee on purchases of shares of
the  Portfolios.  The purpose of the fee is to indirectly  allocate  transaction
costs associated with new purchases to investors  making those  purchases,  thus
protecting existing shareholders.  These costs include: (1) brokerage costs; (2)
market impact  costs--i.e.,  the increase in market prices which may result when
the Portfolios  purchase thinly traded stocks; (3) sales charges relating to the
purchase  of shares in certain  unaffiliated  investment  companies;  and,  most
importantly  (4) the  effect of the  "bid-ask"  spread  in the  over-the-counter
market.  (Securities in the  over-the-counter  market are bought at the "ask" or
purchase price,  but are valued in the Portfolios at the last quoted bid price).
The additional  transaction fees represent the Investment  Adviser's estimate of
the  brokerage  and other  transaction  costs which may be incurred by the Small
Company Index and  International  Equity Index Portfolios in acquiring stocks of
small  capitalization or foreign companies.  Without the additional  transaction
fee, the Portfolios would generally be selling their shares at a price less than
the cost to the  Portfolios of acquiring the portfolio  securities  necessary to
maintain  their  investment   characteristics,   thereby  resulting  in  reduced
investment  performance  for  all  shareholders  in  the  Portfolios.  With  the
additional transaction fee, the transaction costs of acquiring additional stocks
are not borne by all existing shareholders,  but are defrayed by the transaction
fees paid by those investors making additional purchases of shares.

         Calculation of Portfolio Turnover Rate. The portfolio turnover rate for
the  Portfolios  is  calculated  by dividing the lesser of purchases or sales of
portfolio  investments for the reporting  period by the monthly average value of
the portfolio  investments  owned during the reporting  period.  The calculation
excludes all securities, including options, whose maturities or expiration dates
at the time of  acquisition  are one year or less.  Portfolio  turnover may vary
greatly  from  year to year as well as  within  a  particular  year,  and may be
affected by cash requirements for redemption of shares and by requirements which
enable the Portfolios to receive favorable tax treatment.

                             Investment Restrictions

         Each Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below which may be changed with  respect to a  particular  Portfolio
only by a vote of the  holders of a  majority  of such  Portfolio's  outstanding
shares.

No Portfolio may:

          (1)  Make loans,  except for (a) the purchase of debt  obligations  in
               accordance   with  the  Portfolio's   investment   objective  and
               policies, (b) repurchase agreements with banks, brokers,  dealers
               and other financial institutions, (c) loans of securities and (d)
               loans to affiliates  of the portfolio to the extent  permitted by
               law.

          (2)  Purchase  or sell real  estate,  but this  restriction  shall not
               prevent a Portfolio  from  investing  directly or  indirectly  in
               portfolio instruments secured by real estate or interests therein
               or acquiring securities of real estate investment trusts or other
               issuers that deal in real estate.

          (3)  Invest in  commodities or commodity  contracts,  except that each
               Portfolio  may invest in currency and financial  instruments  and
               contracts that are commodities or commodity contracts.

          (4)  Invest in companies for the purpose of exercising control.

          (5)  Act as underwriter  of  securities,  except as a Portfolio may be
               deemed to be an  underwriter  under the Securities Act of 1933 in
               connection with the purchase and sale of portfolio instruments in
               accordance with its investment objective and portfolio management
               policies.

          (6)  Make   any   investment   inconsistent   with   the   Portfolio's
               classification as a diversified investment company under the 1940
               Act.  (This  limitation  does  not  apply  to  the  MarketCommand
               Portfolio.)

          (7)  Purchase  securities (other than obligations issued or guaranteed
               by the U.S. Government, its agencies or instrumentalities and, in
               the case of the International Equity Index Portfolios, securities
               of other investment  companies) if such purchase would cause more
               than 25% in the aggregate of the market value of the total assets
               of a Portfolio  to be invested in the  securities  of one or more
               issuers having their  principal  business  activities in the same
               industry.  For the  purposes of this  restriction,  as to utility
               companies,  the gas, electric, water and telephone businesses are
               considered separate industries; personal credit finance companies
               and business  credit finance  companies are deemed to be separate
               industries;  and wholly-owned finance companies are considered to
               be in the  industries  of their parents if their  activities  are
               primarily related to financing the activities of their parents.

          (8)  Borrow money,  except that to the extent  permitted by applicable
               law (a) the  Portfolio  may borrow from banks,  other  affiliated
               investment companies and other persons, and may engage in reverse
               repurchase   agreements  and  other  transactions  which  involve
               borrowings,  in  amounts  up  to  33-1/3%  of  its  total  assets
               (including  the  amount   borrowed)  or  such  other   percentage
               permitted  by  law,  (b)  the  Portfolio  may  borrow  up  to  an
               additional 5% of its total assets for temporary purposes, (c) the
               Portfolio may obtain such short-term  credits as may be necessary
               for the clearance of purchases and sales of portfolio securities,
               and (d) the Portfolio may purchase  securities on margin.  If due
               to market fluctuations or other reasons a Portfolio's  borrowings
               exceed the  limitations  stated  above,  the Trust will  promptly
               reduce the  borrowings of such  Portfolio in accordance  with the
               1940 Act.  In  addition,  as a matter of  fundamental  policy,  a
               Portfolio  will not issue  senior  securities  to the extent such
               issuance would violate applicable law.

          (9)  Notwithstanding  any of the Trust's other fundamental  investment
               restrictions (including,  without limitation,  those restrictions
               relating to issuer  diversification,  industry  concentration and
               control),   each  Portfolio  may  purchase  securities  of  other
               investment  companies to the full extent  permitted under Section
               12 of the 1940 Act (or any successor  provision thereto) or under
               any   regulation  or  order  of  the   Securities   and  Exchange
               Commission;  and each  Portfolio may invest all or  substantially
               all of its  assets in a single  open-end  investment  company  or
               series thereof with substantially the same investment  objective,
               policies and fundamental restrictions as the Portfolio.



   In applying  Restriction No. 7 above, a security is considered to be issued
by the entity,  or  entities,  whose assets and revenues  back the  security.  A
guarantee of a security is not deemed to be a security  issued by the  guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by a Portfolio,  does not exceed 10% of the value of the Portfolio's total
assets.

     Except to the extent otherwise provided in Investment Restriction No. 7 for
the purpose of such  restriction,  in determining  industry  classification  the
Trust  intends  to use  the  industry  classification  titles  in the  Bloomberg
Industry Group  Classifications  (except that the International Growth Portfolio
and the International Equity Index Portfolio will use the Morgan Stanley Capital
International  industry  classification  titles).  Securities  held in escrow or
separate  accounts  in  connection  with  a  Portfolio's   investment  practices
described in this  Additional  Statement and in the Prospectus are not deemed to
be mortgaged,  pledged or hypothecated for purposes of the foregoing  Investment
Restrictions.

     Any restriction which involves a maximum  percentage will not be considered
violated unless an excess over the percentage occurs  immediately  after, and is
caused  by, an  acquisition  or  encumbrance  of  securities  or  assets  of, or
borrowings by, a Portfolio.

         As  a  non-fundamental   investment   restriction,   the  MarketCommand
Portfolio  may not  hold,  at the end of any tax  quarter,  more than 10% of the
outstanding  voting  securities of any one issuer,  except that up to 50% of the
total value of the assets of the  Portfolio  may be  invested in any  securities
without  regard to this 10%  limitation so long as no more than 25% of the total
value of its assets is invested in the  securities of any one issuer (except the
U.S. Government, its agencies and instrumentalities). Also, as a non-fundamental
investment restriction, the MarketCommand Portfolio will not hold any securities
(except U.S.  government  securities)  that would  cause,  at the end of any tax
quarter,  more than 5% of its total assets to be invested in the  securities  of
any one issuer,  except that up to 50% of the  Portfolio's  total  assets may be
invested  without  regard to this  limitation so long as no more than 25% of the
Portfolio's total assets are invested in any one issuer (except the U.S.
government, its agencies and instrumentalities).

                          ADDITIONAL TRUST INFORMATION

Trustees and Officers

The business and affairs of the Trust and each  Portfolio  are managed under the
direction  of the  Trust's  Board of  Trustees.  Information  pertaining  to the
Trustees and officers of the Trust is set forth below.



<PAGE>

<TABLE>
<CAPTION>
<S><C>                                 <C>          <C>              <C>

Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Stephen Timbers                        55****       Chairman    and  President of Northern Trust Global
                                                    Trustee          Investments, a division of Northern Trust
                                                                     Corporation since 1998; President, Chief
                                                                     Executive Officer and Director of Zurich
                                                                     Kemper Investments from 1996 to 1998;
                                                                     President and Chief Operating Officer of
                                                                     Kemper Corporation from 1992 to 1996;
                                                                     President and Director Kemper Funds from 1990
                                                                     to 1998.  Director: LTV Corporation. Trustee:
                                                                     Northern Funds.


<PAGE>





Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Mr. Wesley M. Dixon, Jr.               72           Trustee          Director of Earl Kinship Capital Corporation
400 Skokie Blvd., Suite 300                                          since 1985, Vice Chairman and Director of G.D.
Northbrook, Illinois  60062                                          Searle & Co. (manufacture and sale of food
                                                                     products and pharmaceuticals) from 1977 to
                                                                     1983 and President of G.D. Searle & Co. prior
                                                                     thereto.  Trustee: Northern Funds.

Mr. William J. Dolan, Jr.              67           Trustee          Partner of Arthur Andersen & Co. S.C.
1534 Basswood Circle                                                 (accounting firm) from 1966 until his
Glenview, Illinois  60025                                            retirement in December 1989.  Financial
                                                                     Consultant, Ernst & Young from 1992 to 1993
                                                                     and 1997. Director: Household Bank, First
                                                                     Central National Life Insurance Company and
                                                                     Director of First Central National Life
                                                                     Insurance Company since July 1998.  Trustee:
                                                                     Northern Funds.

Mr. Raymond E. George, Jr.             69*          Trustee          Senior Vice President and Senior Fiduciary
703 Prospect Avenue                                                  Officer of The Northern Trust Company from
Winnetka, Illinois  60093                                            1990 until his retirement in October 1993.
                                                                     Trustee: Northern Funds.

Mr. Michael E. Murphy                  63**         Trustee          President of Sara Lee Foundation since
Suite 2222                                                           November 1997.  Vice Chairman and Chief
20 South Clark Street                                                Administrative Officer of Sara Lee Corporation
Chicago, Illinois  60603                                             (consumer products) from November 1994 to
                                                                     October 1997; Vice Chairman and Chief
                                                                     Financial and Administrative Officer of Sara
                                                                     Lee Corporation from July 1993 to November
                                                                     1994. Director: Payless Shoe Source, Inc.,
                                                                     True North Communications, Inc., American
                                                                     General Corporation, GATX Corporation and
                                                                     Bassett Furniture Industries, Inc.  Trustee:
                                                                     Northern Funds.

Mary Jacobs Skinner, Esquire           42***        Trustee          Partner in the law firm of Sidley & Austin.
One First National Plaza                                             Trustee: Northern Funds.
Chicago, Illinois  06063

William H. Springer                    71           Trustee          Vice Chairman of Ameritech (a
701 Morningside Drive                                                telecommunications holding company) from
Lake Forest, IL 60045                                                February 1987 until his retirement in August
                                                                     1992; Vice Chairman, Chief Financial and
                                                                     Administrative Officer of Ameritech prior
                                                                     1987. Director of Walgreen Co. (a retail drug
                                                                     store business); Baker, Fentress & Co. (a
                                                                     closed-end, non-diversified management
                                                                     investment company). Trustee of Goldman Sachs
                                                                     Trust; Goldman Sachs Variable Insurance Trust.
                                                                     Trustee:  Northern Funds.

Richard G. Cline                       65           Trustee          Chairman, Hawthorne Investors, Inc. (a
4200 Commerce Court,                                                 management advisory services and private
Suite 300                                                            investment company) since January 1996;
Lisle, IL 60532                                                      Chairman, Hussman International, Inc. (a
                                                                     refrigeration company) since January 1998,
                                                                     Chairman and CEO of NICOR Inc. (a diversified
                                                                     public utility holding company) from 1986 to
                                                                     1995, and President, 1992-1993; Chairman,
                                                                     Federal Reserve Bank of Chicago from 1992 to
                                                                     1995; and Deputy Chairman from 1995 to 1996.
                                                                     Director: Whitman Corporation (a diversified
                                                                     holding company), Kmart Corporation (a
                                                                     retailing company), Ryerson Tull, Inc. (a
                                                                     metals distribution company) and University of
                                                                     Illinois Foundation. Trustee:  Northern Funds.


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Edward J. Condon, Jr.                  60           Trustee          Chairman of The Paradigm Group, Ltd. (a
Sears Tower, Suite 9650                                              financial advisor) since July 1993; Vice
233 S. Wacker Drive                                                  President and Treasurer of Sears, Roebuck and
Chicago, IL 60606                                                    Co. (retail corporation) from February 1989 to
                                                                     July 1993; Member of Advisory Board of
                                                                     Real-Time USA, Inc. (a software company);
                                                                     Member of the Board of Managers of The Liberty
                                                                     Hampshire Company, LLC (a receivable
                                                                     securitization company); Vice Chairman and
                                                                     Director of Energenics L.L.C. Director:
                                                                     University Eldercare, Inc.; Financial Pacific
                                                                     Company Trustee: Dominican University.
                                                                     Trustee:  Northern Funds.

John W. English                        67           Trustee          Private Investor; Vice President and Chief
50-H New England Ave.                                                Investment Officer of The Ford Foundation (a
P.O. Box 640                                                         charitable trust) from 1981 to 1993.  Trustee:
Summit, NJ 07902-0640                                                The China Fund, Inc., Select Sector SPDR
                                                                     Trust; WM Funds; American Red Cross in Greater
                                                                     New York; Mote Marine Laboratory (a non-profit
                                                                     marine research facility); and United Board
                                                                     for Christian Higher Education in Asia.
                                                                     Director: University of Iowa Foundation,
                                                                     Blanton-Peale Institutes of Religion and
                                                                     Health; Community Foundation of Sarasota
                                                                     County; Duke Management Company (an investment
                                                                     adviser); and John Ringling Centre Foundation.
                                                                     Trustee:  Northern Funds.

Sandra Polk Guthman                    56           Trustee          President and CEO of Polk Bros. Foundation (an
420 N. Wabash Avenue                                                 Illinois not-for-profit corporation) from 1993
Suite 204                                                            to present; Director of Business
Chicago, IL 60611                                                    Transformation from 1992-1993, and Midwestern
                                                                     Director of Marketing from 1988-1992, IBM (a
                                                                     technology company); Director: MBIA Insurance
                                                                     Corporation of Illinois (bank holding
                                                                     company); MB Financial Corp. (a bank holding
                                                                     company). Trustee:  Northern Funds.

Richard P. Strubel                     61           Trustee          President and Chief Operating Officer,
737 N. Michigan Avenue                                               Unext.com since 1999; Managing Director of
Suite 1405                                                           Tandem Partners, Inc. (a privately held
Chicago, IL 60611                                                    management services firm) since 1990 to 1999;
                                                                     President and Chief Executive Officer,
                                                                     Microdot, Inc. (a privately held manufacturing
                                                                     firm) from 1984 to 1994; Director: Gildan
                                                                     Activewear, Inc.; Children's Memorial Medical
                                                                     Center. Trustee:  University of Chicago;
                                                                     Goldman Sachs Trust; Goldman Sachs Variable
                                                                     Insurance Trust. Trustee:  Northern Funds.

Jylanne M. Dunne                       40           President        Senior Vice President for Distribution
4400 Computer Drive                                                  Services at PFPC Inc. ("PFPC") (formerly First
Westborough, MA 01581                                                Data Investor Services Group, Inc. ("FDISG"))
                                                                     (since 1988).

Richard H. Rose                        44           Vice President   Vice President and Division Manager of Mutual
4400 Computer Drive                                                  Fund Administration at PFPC (formerly FDISG)
Westborough, MA 01581                                                (since 1994).

Brian R. Curran                        32           Treasurer        Director of Fund Administration at PFPC
4400 Computer Drive                                                  (formerly FDISG) (since 1997); Director of
Westborough, MA 01581                                                Fund Administration at State Street Bank &
                                                                     Trust
                                                                     Company
                                                                     (February
                                                                     1997     to
                                                                     October
                                                                     1997);
                                                                     Senior
                                                                     Auditor  at
                                                                     Price
                                                                     Waterhouse
                                                                     L.L.P.
                                                                     (February
                                                                     1994     to
                                                                     February
                                                                     1997).


Judith E. Clear                        33           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC since 1997; Compliance
Westborough, MA 01581                                                Manager at Citizens Trust from 1994 to 1996.

Suzanne E. Anderson                    27           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC Inc. (since August
Westborough, MA 01581                                                1998); Manager of Fund Administration at State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1996     to
                                                                     August
                                                                     1998); Fund
                                                                     Administrator
                                                                     at    State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1995     to
                                                                     October
                                                                     1996);
                                                                     Mutual Fund
                                                                     Accountant
                                                                     at      The
                                                                     Boston
                                                                     Company
                                                                     (prior
                                                                     thereto).

Linda J. Hoard                         52           Secretary        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                                  1998); Attorney Consultant for Fidelity
Westborough, MA 01581                                                Management & Research (a financial service
                                                                     company);
                                                                     Investors
                                                                     Bank      &
                                                                     Trust
                                                                     Company  (a
                                                                     financial
                                                                     service
                                                                     provider)
                                                                     and   FDISG
                                                                     (September
                                                                     1994     to
                                                                     June 1998).

Teresa M.R. Hamlin                     35           Assistant        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                 Secretary        1994).
Westborough, MA 01581

Therese Hogan                          37           Assistant        Director of the State Regulation Department at
4400 Computer Drive                                 Secretary        PFPC (formerly FDISG) (since 1994).
Westborough, MA 01581
</TABLE>

*        Mr. George is deemed to be an "interested" Trustee because he owns
shares of Northern Trust Corporation.
**       Mr. Murphy is deemed to be an "interested" Trustee because he owns
shares of Northern Trust Corporation.
***      Ms. Skinner is deemed to be an "interested" Trustee because her law
firm provides legal services to Northern Trust Corporation.
****     Mr. Timbers is deemed to be an "interested" Trustee because he is an
officer, director, employee and shareholder of Northern Trust Corporation.


         Certain of the Trustees and officers and the  organizations  with which
they  are  associated  have  had  in the  past,  and  may  have  in the  future,
transactions with the Investment Advisers, PFPC (formerly FDISG), Northern Funds
Distributors,  LLC ("NFD") and their respective  affiliates.  The Trust has been
advised by such Trustees and officers that all such  transactions  have been and
are  expected to be in the  ordinary  course of  business  and the terms of such
transactions,  including all loans and loan  commitments  by such persons,  have
been and are expected to be  substantially  the same as the prevailing terms for
comparable transactions for other customers. As a result of the responsibilities
assumed  by  the  Trust's  service  providers,  the  Trust  itself  requires  no
employees.

         Each officer holds  comparable  positions with certain other investment
companies for which NFD, PFPC or an affiliate thereof is the investment adviser,
administrator and/or distributor provides services.

         Additionally,   the  Trust,   its  investment   adviser  and  principal
underwriter  have  adopted  codes of ethics (the  "Codes of Ethics")  under rule
17j-1 of the 1940 Act.  The Codes of Ethics  permit  personnel,  subject  to the
Codes of  Ethics  and their  provisions,  to  invest  in  securities,  including
securities that may be purchased or held by the Trust.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In  addition,   the  Trustees  have   established  an  Audit  Committee
consisting  of two  members  including a Chairman  of the  Committee.  The Audit
Committee members are Messrs. Condon and Strubel (Chairman). Each member earns a
fee of $2,500 for each  meeting  attended  and the  Chairman  earns a  quarterly
retainer of $1,500.

         Each Trustee will hold office for an indefinite term until the earliest
of (1) the next  meeting  of  shareholders  if any,  called  for the  purpose of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust, or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

     The Trust's  officers do not  receive  fees from the Trust for  services in
such capacities,  although PFPC, of which they are also officers,  receives fees
from the Trust for co-administrative services.


         The following table sets forth certain  information with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1999:


<PAGE>

<TABLE>
<CAPTION>
<S><C>   <C>       <C>        <C>         <C>       <C>      <C>       <C>        <C>            <C>       <C>         <C>


                                                    Small     Small                              Inter-    Inter-      Total
                    Equity    Diversified Focused   Company   Company   Mid Cap   MarketCommand  national  national    Compensation
          Balanced  Index     Growth      Growth    Index     Growth    Growth    Portfolio      Equity    Growth      from Fund
          Portfolio Portfolio Portfolio   Portfolio Portfolio Portfolio Portfolio                 Index    Portfolio   Complex


Steven    0         0         0           0         0          n/a       n/a       n/a              0       0           0
Timbers**
William   530       5,300     19610       530       530        n/a       n/a       n/a              530     530         53,000
H.
Springer
Richard   395       3,950     395         395       395        n/a       n/a       n/a              395     395         39,500
G. Cline
Edward    445       4,450     450         450       450        n/a       n/a       n/a              450     450         44,500
J.
Condon,
Jr.
John W.   395       3,950     395         395       395        n/a       n/a       n/a              395     395         39,500
English
Sandra    395       3,950     395         395       395        n/a       n/a       n/a              395     395         39,500
Polk
Guthman
Frederick 445       4,450    445          445       445        n/a       n/a       n/a              445     445         44,500
T.
Kelsey*
Richard   505       5,050    505          505       505        n/a       n/a       n/a              505     505         50,500
P.
Strubel
Wesley    0         0         0           0         0          n/a       n/a       n/a              0       0           22,500
M.
Dixon,
Jr.**
William   0         0         0           0         0          n/a       n/a       n/a              0       0           22,500
J.
Dolan,
Jr.**
Raymond   0         0         0           0        0          n/a       n/a       n/a               0       0           21,250
E.
George,
Jr.**
Michael   0         0         0           0         0          n/a       n/a       n/a              0       0           22,500
E.
Murphy**
Mary      0         0         0           0         0          n/a       n/a       n/a              0       0           22,500
Jacobs
Skinner**
</TABLE>

     * Frederick Kelsey retired from the Board of Trustees on November 30, 1999.
** Not a Trustee of the  Northern  Institutional  Funds  during the period ended
November 30, 1999. Small Company Growth,  Mid Cap and  MarkerCommand  Portfolios
did not commence operations during the period.

Investment Advisers, Transfer Agent and Custodian

         Northern,  a wholly-owned  subsidiary of Northern Trust Corporation,  a
bank  holding  company,  is one of the nation's  leading  providers of trust and
investment  management  services.  Northern  is  one of  the  strongest  banking
organizations  in  the  United  States.  Northern  believes  it  has  built  its
organization  by serving clients with  integrity,  a commitment to quality,  and
personal  attention.  Its  stated  mission  with  respect  to all its  financial
products and services is to achieve unrivaled client satisfaction.  With respect
to such clients,  the Trust is designed to assist (i) defined  contribution plan
sponsors and their employees by offering a range of diverse  investment  options
to help comply with 404(c) regulation and may also provide educational  material
to their  employees,  (ii)  employers  who  provide  post-retirement  Employees'
Beneficiary  Associations  ("VEBA") and require  investments that respond to the
impact of federal  regulations,  (iii)  insurance  companies with the day-to-day
management of uninvested  cash balances as well as with  longer-term  investment
needs, and (iv) charitable and not-for-profit organizations,  such as endowments
and  foundations,  demanding  investment  management  solutions that balance the
requirement  for sufficient  current  income to meet operating  expenses and the
need for capital appreciation to meet future investment objectives. NTQA, also a
wholly-owned  subsidiary  of Northern  Trust  Corporation,  serves as investment
adviser  principally  to defined  benefit  and  defined  contribution  plans and
manages  over 60 equity  and bond  commingled  and  common  trust  funds.  As of
December  31,  1999,   the   Investment   Advisers  and  their   affiliates  had
approximately  $299.1 billion in assets under  management for clients  including
public  and  private   retirement  funds,   endowments,   foundations,   trusts,
corporations, other investment companies and individuals.

         Subject  to the  general  supervision  of the  Board of  Trustees,  the
Investment  Advisers make  decisions  with respect to, and place orders for, all
purchases and sales of portfolio  securities  for each  Portfolio.  The Advisory
Agreement with the Trust provides that in selecting  brokers or dealers to place
orders for  transactions  (a) on common and  preferred  stocks,  the  Investment
Advisers  shall  use  their  best  judgment  to obtain  the best  overall  terms
available,  and (b) on bonds and other fixed income obligations,  the Investment
Advisers shall attempt to obtain best net price and execution.  In assessing the
best overall terms available for any transaction, the Investment Advisers are to
consider all factors they deem relevant,  including the breadth of the market in
the security,  the price of the security,  the financial condition and execution
capability of the broker or dealer, and the reasonableness of the commission, if
any, both for the specific  transaction and on a continuing basis. In evaluating
the best  overall  terms  available  and in  selecting  the  broker or dealer to
execute a  particular  transaction,  the  Investment  Advisers  may consider the
brokerage and research services provided to the Portfolios and/or other accounts
over  which  the  Investment  Advisers  or an  affiliate  of  Northern  exercise
investment  discretion.  A broker or dealer providing  brokerage and/or research
services may receive a higher  commission  than  another  broker or dealer would
receive for the same  transaction.  These  brokerage  and research  services may
include industry and company analyses,  portfolio  services,  quantitative data,
market information systems and economic and political  consulting and analytical
services.

         Transactions on U.S. stock exchanges  involve the payment of negotiated
brokerage  commissions.  On exchanges on which  commissions are negotiated,  the
cost of transactions may vary among different  brokers.  Transactions on foreign
stock exchanges  involve payment for brokerage  commissions  which are generally
fixed.   Over-the-counter   issues,  including  corporate  debt  and  government
securities,  are  normally  traded on a "net" basis (i.e.,  without  commission)
through dealers, or otherwise involve  transactions  directly with the issuer of
an instrument.  With respect to  over-the-counter  transactions,  the Investment
Advisers  will  normally  deal  directly  with  dealers who make a market in the
instruments  involved except in those  circumstances where more favorable prices
and  execution  are  available  elsewhere.  The  cost of  foreign  and  domestic
securities  purchased from underwriters  includes an underwriting  commission or
concession,  and the prices at which  securities  are purchased from and sold to
dealers include a dealer's mark-up or mark-down.

         The Portfolios may participate, if and when practicable, in bidding for
the purchase of portfolio  securities  directly  from an issuer in order to take
advantage of the lower purchase  price  available to members of a bidding group.
The Portfolios will engage in this practice,  however,  only when the Investment
Advisers believe such practice to be in the Portfolios' interests.

         On occasions when the Investment  Advisers deem the purchase or sale of
a security to be in the best interests of a Portfolio as well as other fiduciary
or agency accounts  managed by them (including any other  Portfolio,  investment
company  or account  for which the  Investment  Advisers  act as  adviser),  the
Advisory  Agreement  provides  that  the  Investment  Advisers,  to  the  extent
permitted by applicable laws and regulations, may aggregate the securities to be
sold or purchased for such Portfolio with those to be sold or purchased for such
other  accounts in order to obtain best overall terms  available with respect to
common and preferred  stock,  and best net price and  execution  with respect to
bonds and other  fixed  income  obligations.  In such event,  allocation  of the
securities  so  purchased  or  sold,  as well as the  expenses  incurred  in the
transaction, will be made by the Investment Advisers in the manner they consider
to be most  equitable and  consistent  with their  fiduciary  obligations to the
Portfolio and other accounts  involved.  In some  instances,  this procedure may
adversely  affect the size of the  position  obtainable  for a Portfolio  or the
amount of the securities that are able to be sold for a Portfolio.

         The Advisory Agreement provides that the Investment Advisers may render
similar  services to others so long as their services under such  Agreements are
not impaired thereby.  The Advisory  Agreement also provides that the Trust will
indemnify  the  Investment  Advisers  against  certain  liabilities   (including
liabilities  under the Federal  securities laws relating to untrue statements or
omissions of material fact and actions that are in accordance  with the terms of
the Agreements) or, in lieu thereof, contribute to resulting losses.

         At  a  meeting  held  on  September  2,  1997,   shareholders   of  the
International  Growth Portfolio  approved a new advisory agreement with Northern
and another wholly-owned  subsidiary of Northern Trust Corporation (The Northern
Trust Company of Connecticut,  formerly,  RCB Trust Company, which has principal
offices at 300 Atlantic Street,  Stamford,  Connecticut 06901) that would permit
the Portfolio to implement a "manager-of-managers"  structure.  The new advisory
agreement  would be identical in all material  respects to the current  Advisory
Agreement for the International Growth Portfolio,  except that the new agreement
would appoint both Northern and The Northern Trust Company of Connecticut as the
advisers of the  Portfolio  and would allow the advisers to (1)  delegate  their
duties to sub-advisers,  (2) implement a  manager-of-managers  structure and (3)
enter into  sub-advisory  agreements in the future without  further  shareholder
approval.  Fees payable to the sub-advisers would be payable by Northern and The
Northern Trust Company of Connecticut and not by the Portfolio,  and the current
investment advisory fee rate payable by the Portfolio would not change. Although
the  Securities  and  Exchange  Commission  (the "SEC") has granted an exemption
permitting the Portfolio to implement a manager-of-managers  structure,  the new
advisory agreement will not become effective until the Trust's Board of Trustees
acts to effectuate the structure with respect to the Portfolio.  At present,  it
is  uncertain  when,  or  if,  the  manager-of-managers  structure  will  become
effective.

         Under its Transfer  Agency  Agreement  with the Trust,  with respect to
shares held by  Institutions,  Northern has undertaken to perform some or all of
the following  services:  (1)  establish and maintain an omnibus  account in the
name of each  Institution;  (2) process purchase orders and redemption  requests
from an Institution, and furnish confirmations and disburse redemption proceeds;
(3) act as the income  disbursing  agent of the Trust; (4) answer inquiries from
Institutions;  (5) provide periodic  statements of account to each  Institution;
(6) process and record the issuance and redemption of shares in accordance  with
instructions  from  the  Trust or its  administrator;  (7) if  required  by law,
prepare and forward to Institutions  shareholder  communications  (such as proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution  and tax  notices);  (8) preserve  all records;  and (9)
furnish  necessary  office space,  facilities and personnel.  Under the Transfer
Agency  Agreement,  with respect to shares held by investors,  Northern has also
undertaken to perform some or all of the following  services:  (1) establish and
maintain  separate  accounts in the name of the investors;  (2) process purchase
orders and redemption  requests,  and furnish  confirmations  in accordance with
applicable  law; (3) disburse  redemption  proceeds;  (4) process and record the
issuance and redemption of shares in accordance with instructions from the Trust
or its  administrator;  (5) act as  income  disbursing  agent  of the  Trust  in
accordance with the terms of the Prospectus and  instructions  from the Trust or
its  administrator;  (6) provide  periodic  statements  of  account;  (7) answer
inquiries  (including  requests for  prospectuses  and  statements of additional
information,  and assistance in the completion of new account applications) from
investors and respond to all requests for information  regarding the Trust (such
as current price, recent performance,  and yield data) and questions relating to
accounts of investors (such as possible errors in statements, and transactions);
(8) respond to and seek to resolve all  complaints of investors  with respect to
the Trust or their accounts;  (9) furnish proxy  statements and proxies,  annual
and semi-annual financial statements, and dividend, distribution and tax notices
to investors;  (10) furnish the Trust with all pertinent  Blue Sky  information;
(11) perform all required  tax  withholding;  (12)  preserve  records;  and (13)
furnish necessary office space,  facilities and personnel.  Northern may appoint
one or more sub-transfer agents in the performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement and the assumption by Northern of related  expenses,
Northern is entitled to a fee from the Trust, payable monthly, at an annual rate
of .01%,  .10% and .15% of the  average  daily net asset value of the Class A, C
and D Shares, respectively, of the Portfolios.

         Under its  Custodian  Agreement  (and in the case of the  International
Growth Portfolio and International  Equity Index Portfolio,  its Foreign Custody
Agreement)  with  the  Trust,  Northern  (1)  holds  each  Portfolio's  cash and
securities,  (2) maintains such cash and securities in separate  accounts in the
name of the Portfolio,  (3) makes receipts and  disbursements of funds on behalf
of the Portfolio,  (4) receives,  delivers and releases  securities on behalf of
the  Portfolio,  (5)  collects  and  receives  all income,  principal  and other
payments in respect of the  Portfolio's  investments  held by Northern under the
Agreement,  and (6) maintains the accounting records of the Trust.  Northern may
employ one or more  subcustodians,  provided that  Northern,  subject to certain
monitoring  responsibilities,  shall have no more responsibility or liability to
the Trust on account of any action or omission of any  subcustodian  so employed
than such subcustodian has to Northern and that the  responsibility or liability
of the  subcustodian to Northern shall conform to the resolution of the Trustees
of the Trust authorizing the appointment of the particular  subcustodian (or, in
the case of  foreign  securities,  to the terms of any  agreement  entered  into
between  Northern and such  subcustodian to which such resolution  relates).  In
addition,  the Trust's custodial  arrangements  provide, with respect to foreign
securities,  that Northern shall not be: (i) responsible for the solvency of any
subcustodian appointed by it with reasonable care; (ii) responsible for any act,
omission,  default  or for  the  solvency  of any  eligible  foreign  securities
depository;  and (iii) liable for any loss, damage, cost, expense,  liability or
claim resulting from nationalization,  expropriation,  currency restrictions, or
acts of war or  terrorism  or any loss  where  the  subcustodian  has  otherwise
exercised reasonable care. Northern may also appoint agents to carry out such of
the provisions of the Custodian  Agreement and the Foreign Custody  Agreement as
Northern may from time to time direct, provided that the appointment of an agent
shall  not  relieve  Northern  of  any  of  its  responsibilities  under  either
Agreement.  Northern has entered into agreements with financial institutions and
depositories  located in foreign  countries  with  respect to the custody of the
Portfolio's foreign securities.

         As compensation  for the services  rendered to the Trust by Northern as
custodian  with  respect  to each  Portfolio  except  the  International  Growth
Portfolio  and  International  Equity Index  Portfolio,  and the  assumption  by
Northern of certain related  expenses,  Northern is entitled to payment from the
Trust as follows: (i) $18,000 annually for each Portfolio,  plus (ii) 1/100th of
1%  annually  of each  Portfolio's  average  daily net assets to the extent they
exceed $100  million,  plus (iii) a fixed dollar fee for each trade in portfolio
securities,  plus  (iv) a fixed  dollar  fee for  each  time  that  Northern  as
Custodian  receives  or  transmits  funds via wire,  plus (v)  reimbursement  of
expenses incurred by Northern as custodian for telephone, postage, courier fees,
office supplies and duplicating.  The fees referred to in clauses (iii) and (iv)
are subject to annual  upward  adjustments  based on  increases  in the Consumer
Price Index for All Urban  Consumers,  provided that Northern may permanently or
temporarily waive all or any portion of any upward adjustment.

         As  compensation  for the  services  rendered  to the  Trust  under the
Foreign Custody Agreement with respect to the International Growth Portfolio and
International Equity Index Portfolio,  and the assumption by Northern of certain
related expenses, Northern is entitled to payment from the Trust as follows: (i)
$35,000 annually for the International Growth Portfolio and International Equity
Index  Portfolio,  plus (ii) 9/100th of 1% annually of the  Portfolios'  average
daily net  assets,  plus (iii)  reimbursement  for fees  incurred by Northern as
foreign  custodian for telephone,  postage,  courier fees,  office  supplies and
duplicating.

         Northern's  fees under the  Custodian  Agreement  and  Foreign  Custody
Agreement are subject to reduction  based on the  Portfolios'  daily  uninvested
cash balances (if any).

         Unless  sooner  terminated,   the  Advisory  Agreement,  the  Custodian
Agreement  (or,  in  the  case  of  the   International   Growth  Portfolio  and
International  Equity Index  Portfolio,  the Foreign Custody  Agreement) and the
Transfer  Agency  Agreement will continue in effect with respect to a particular
Portfolio until April 30, 1999 and thereafter for successive  12-month  periods,
provided that the continuance is approved at least annually (1) by the vote of a
majority of the  Trustees who are not parties to the  agreement  or  "interested
persons" (as such term is defined in the 1940 Act) of any party thereto, cast in
person at a meeting called for the purpose of voting on such  approval,  and (2)
by the Trustees or by the vote of a majority of the  outstanding  shares of such
Portfolio  (as defined  below under  "Other  Information").  Each  agreement  is
terminable  at any time without  penalty by the Trust (by  specified  Trustee or
shareholder  action)  on 60 days'  written  notice  to  Northern  or NTQA and by
Northern or NTQA on 60 days' written notice to the Trust.

     Prior to April 1, 1998, Northern served as investment adviser to the Equity
Index, Small Company Index and International Equity Index Portfolios on the same
terms as
those described above.

         For the fiscal years or periods  ended  November 30 as  indicated,  the
amount of advisory fees incurred by each Portfolio  (after fee waivers)  (except
for Mid Cap  Growth,  MarketCommand  and  Small  Company  Growth,  which did not
commence  operations  during the fiscal  year ended  November  30,  1999) was as
follows:
<TABLE>
<CAPTION>
<S>                                                            <C>                 <C>                  <C>

                                                                  1999                1998                  1997

Balanced Portfolio                                             $ 368,178            $  297,879          $  270,536
Equity Index Portfolio                                         1,453,598             1,136,850              830,952
Diversified Growth Portfolio                                   1,050,355               905,091              795,346
Focused Growth Portfolio                                       1,315,624             1,045,682              934,052
Small Company Index Portfolio                                      397,251             248,736              242,421
International Growth Portfolio                                      985,305                                 869,641993,121
International Equity Index Portfolio1                              126,053              117,326              44,662
- ------------------
1        Commenced investment operations on April 1, 1997.
</TABLE>


<PAGE>



         For the fiscal years or periods  ended  November 30 as  indicated,  the
Investment Advisers waived advisory fees as follows:
<TABLE>
<CAPTION>
<S>                                                          <C>                  <C>                  <C>

                                                                  1999                1998                  1997

Balanced Portfolio                                            $  220,907            $  178,727         $  162,322
Equity Index Portfolio                                         2,907,197             2,273,722          1,661,904
Diversified Growth Portfolio                                     477,434               411,405             361,521
Focused Growth Portfolio                                         493,359               392,131             350,269
Small Company Index Portfolio                                    397,250               248,733             242,421
International Growth Portfolio                                   246,326                217,410             248,280
International Equity Index Portfolio 1                           126,053                117,319              44,662
- ------------------
1        Commenced investment operations on April 1, 1997.
</TABLE>

         For the fiscal years or periods  ended  November 30 as  indicated,  the
amount of transfer agency fees incurred by each Portfolio was as follows:
<TABLE>
<CAPTION>
<S>                                                          <C>             <C>            <C>

                                                              1999            1998            1997

Balanced Portfolio                                            $   9,237       $  11,754       $  10,622
Equity Index Portfolio                                         274,756          249,731         172,360
Diversified Growth Portfolio                                     19,733           17,453          15,280
Focused Growth Portfolio                                         26,816           23,773          19,546
Small Company Index Portfolio                                    20,843           13,858          12,676
International Growth Portfolio                                   12,389           11,469          12,624
International Equity Index Portfolio1                             5,061            4,696          1,780
- ------------------
1        Commenced investment operations on April 1, 1997.
</TABLE>

         For the fiscal years or periods  ended  November 30 as  indicated,  the
amount of custodian fees (and, in the case of the International Growth Portfolio
and International  Equity Index Portfolio,  the foreign custodian fees) incurred
by each Portfolio was as follows:

<TABLE>
<CAPTION>
<S>                                                          <C>                    <C>                  <C>

                                                                  1999                1998                  1997

Balanced Portfolio                                            $  22,972               $ 22,993            $ 24,371
Equity Index Portfolio                                          200,973                268,057             142,960
Diversified Growth Portfolio                                      31,714                28,035              27,587
Focused Growth Portfolio                                          30,486                28,583              23,050
Small Company Index Portfolio                                   491,423                227,658              66,695
International Growth Portfolio                                  135,538               123,373              158,611
International Equity Index Portfolio1                            77,124                 67,398              49,999
- -------------------
1        Commenced investment operations on April 1, 1997.

</TABLE>

         Under a Service Mark License  Agreement with the Trust,  Northern Trust
Corporation has agreed that the name "Northern  Institutional Funds" may be used
in connection with the Trust's business on a royalty-free basis.  Northern Trust
Corporation has reserved to itself the right to grant the non-exclusive right to
use the name "Northern  Institutional  Funds" to any other person. The Agreement
provides  that at such time as the  Agreement is no longer in effect,  the Trust
will cease using the name "Northern Institutional Funds."

Portfolio Transactions

         To the extent that a Portfolio effects brokerage  transactions with any
broker/dealer  affiliated  directly or indirectly with the Investment  Advisers,
such  transactions,   including  the  frequency  thereof,  the  receipt  of  any
commissions payable in connection therewith, and the selection of the affiliated
broker/dealer  effecting such  transactions,  will be fair and reasonable to the
shareholders of the Portfolio.

         During the fiscal year ended November 30, 1999, the Balanced  Portfolio
acquired and sold  securities  of Bank of America,  Goldman  Sachs Group,  Inc.,
Merrill Lynch & Co.,  Inc.,  Morgan  Stanley Dean Witter & Co. Inc.,  and Lehman
Brothers, Inc., each a regular broker/dealer. At November 30, 1999, the Balanced
Portfolio   owned  the   following   amounts  of   securities   of  its  regular
broker/dealers,  as defined in Rule 10b-1 under the 1940 Act, or their  parents:
Donaldson  Lufkin & Jenrette  Securities,  Inc.,  with an approximate  aggregate
market  value of  $131,000;  Goldman  Sachs  Group,  Inc.,  with an  approximate
aggregate  market  value  of  $62,000;  Merrill  Lynch  &  Co.,  Inc.,  with  an
approximate  aggregate  market value of $363,000;  Morgan  Stanley Dean Witter &
Co., with an approximate  aggregate market value of $458,000;  and Salomon Smith
Barney, Inc., with an approximate aggregate market value of $648,000.

         During the fiscal year ended November 30, 1999, the Diversified  Growth
Portfolio acquired and sold securities of Bank of America,  Goldman Sachs Group,
Inc.,  Merrill Lynch & Co., Inc.,  Morgan Stanley Dean Witter & Co. Inc., each a
regular  broker/dealer.  At November 30, 1999, the Diversified  Growth Portfolio
owned the  following  amounts of securities  of its regular  broker/dealers,  as
defined in Rule 10b-1 under the 1940 Act, or their parents: Merrill Lynch & Co.,
Inc., with an approximate  aggregate  market value of $1,411,000;  Goldman Sachs
Group, Inc., with an approximate aggregate market value of $287,000;  and Morgan
Stanley  Dean  Witter  & Co.,  with an  approximate  aggregate  market  value of
$2,256,000.

         During the fiscal  year  ended  November  30,  1999,  the Equity  Index
Portfolio  acquired and sold securities of Bank of America,  Bear Stearns & Co.,
Lehman Brothers,  Inc., Merrill Lynch & Co., Inc. and Morgan Stanley Dean Witter
& Co.,  each a regular  broker/dealer.  At November 30,  1999,  the Equity Index
Portfolio   owned  the   following   amounts  of   securities   of  its  regular
broker/dealers,  as defined in Rule 10b-1 under the 1940 Act, or their  parents:
Merrill  Lynch & Co.,  Inc.,  with an  approximate  aggregate  market  value  of
$3,789,000.

         During the fiscal year ended  November  30,  1999,  the Focused  Growth
Portfolio  acquired and sold  securities of Goldman Sachs Group,  Inc.,  Merrill
Lynch & Co.,  Inc.,  and  Morgan  Stanley  Dean  Witter  & Co.,  each a  regular
broker/dealer.  At November 30, 1999,  the Focused  Growth  Portfolio  owned the
following  amounts of  securities of its regular  broker/dealers,  as defined in
Rule 10b-1 under the 1940 Act, or their  parents:  Morgan  Stanley Dean Witter &
Co., with an approximate aggregate market value of $1,206,000.

         During the fiscal  year ended  November  30,  1999,  the  International
Equity  Index  Portfolio  did not  acquire,  sell or own any  securities  of its
regular broker/dealers or their parents.

         During the fiscal  year ended  November  30,  1999,  the  International
Growth  Portfolio  acquired and sold  securities  of UBS  Securities,  a regular
broker/dealer.  At November 30, 1999, the  International  Growth Portfolio owned
the following amounts of securities of its regular broker/dealers, as defined in
Rule  10b-1  under the 1940  Act,  or their  parents:  UBS  Securities,  with an
approximate aggregate market value of $1,641,000.

         During the fiscal year ended November 30, 1999, the Small Company Index
Portfolio acquired and sold securities of Investment Technology Group, a regular
broker/dealer.  At November 30, 1999, the Small Company Index  Portfolio did not
own any securities of its regular broker/dealers or their parents.

         During the fiscal year ended November 30, 1999, the MarketCommand,  Mid
Cap Growth and Small Company Growth Portfolios had not yet commenced operations.




<PAGE>



         For the fiscal years ended  November 30 as  indicated,  each  Portfolio
paid brokerage commissions as follows:

<TABLE>
<CAPTION>
<S>     <C>                    <C>                   <C>                    <C>                    <C>

                                                        Total                  Total                Brokerage
         Fiscal                                       Brokerage              Amount of             Commissions
          Year                    Total              Commissions            Transactions               Paid
          Ended                 Brokerage              Paid to                On Which              to Brokers
      November 30,             Commissions            Affiliated            Commissions             Providing
          1999                     Paid                Brokers1                 Paid                Research4

Balanced
Portfolio


Equity
Index
Portfolio

Focused
Growth
Portfolio

Diversified
Growth
Portfolio

Small Company
Index
Portfolio

International
Growth
Portfolio

International
Equity Index
Portfolio

     1 Goldman,  Sachs & Co., the Trust's  distributor prior to May 1, 1999, was
the only affiliated broker utilized by the Trust during the fiscal year.
2    Percentage of total commissions paid.

     3  Percentage  of total  amount of  transactions  involving  the payment of
commissions   effected  through  affiliated   persons.

     4 The  amounts of the transactions  involving  commissions  paid to brokers
providing research were $18,453,666,  $537,682,036,  $145,818,514,  $94,871,574,
$139,042,814,  $198,366,763  and  $36,469,237  for the  Balanced,  Equity Index,
Focused Growth,  Diversified Growth,  Small Company Index,  International Growth
and International Equity Index Portfolios, respectively.

</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>   <C>                      <C>                   <C>                     <C>                   <C>



                                                        Total                  Total                Brokerage
         Fiscal                                       Brokerage              Amount of             Commissions
          Year                    Total              Commissions            Transactions               Paid
          Ended                 Brokerage              Paid to                On Which              to Brokers
      November 30,             Commissions            Affiliated            Commissions             Providing
          1998                     Paid                Brokers1                 Paid                Research4

Balanced                         $33,693                $2,794              $24,707,706              $25,032
Portfolio                                              (8.24%)2               (1.91%)3

Equity
Index                            148,670                  0                 590,431,860              125,498
Portfolio

Focused                                                 12,648              178,606,124              208,872
Growth                           257,630               (4.91%)2               (0.12) 3
Portfolio


Diversified                                             19,748              116,674,485
Growth                           148,788              (13.27%)2               (2.23%)3               122,744
Portfolio

Small Company
Index                             98,346                  0                 139,815,827               97,942
Portfolio

International                                           23,687              325,994,274
Growth                           933,041               (2.54%)2               (3.32%)3               581,629
Portfolio

International
Equity Index                      72,801                  0                  43,852,342               61,732
Portfolio

     1 Goldman,  Sachs & Co., the Trust's  distributor prior to May 1, 1999, was
the only  affiliated  broker  utilized by the Trust  during the fiscal  year.
  2 Percentage  of  total   commissions  paid.
 3  Percentage  of  total  amount  of
transactions  involving the payment of commissions  effected through  affiliated
persons.
 4 The amounts of the transactions involving commissions paid to brokers
providing research were $18,453,666,  $537,682,036,  $145,818,514,  $94,871,574,
$139,042,814,  $198,366,763  and  $36,469,237  for the  Balanced,  Equity Index,
Focused Growth,  Diversified Growth,  Small Company Index,  International Growth
and International Equity Index Portfolios, respectively.

</TABLE>

<PAGE>

<TABLE>
<CAPTION>
<S>   <C>                      <C>                    <C>                    <C>                    <C>


                                                         Total                   Total               Brokerage
         Fiscal                                        Brokerage               Amount of             Commissions
          Year                    Total               Commissions            Transactions               Paid
          Ended                 Brokerage               Paid to                On Which              to Brokers
      November 30,             Commissions            Affiliated              Commissions            Providing
          1997                    Paid                 Brokers1                  Paid                 Research

Balanced
Portfolio                       $ 32,642                $    0               $ 20,396,168             $ 25,974

Equity
Index
Portfolio                        131,385                   0                  254,772,161             121,495

Focused
Growth
Portfolio                        300,436                 1,484                226,791,529             260,384
                                                        (0.49%)2                (0.59%)3

Diversified
Growth
Portfolio                        202,193                   0                  132,628,487             186,656

Small Company
Index
Portfolio                        73,241                    0                  93,889,780               73,173

International
Growth
Portfolio                       1,163,242                  0                  374,185,022             644,392

International
Equity Index
Portfolio                        56,347                    0                  26,892,453               56,347


1 Goldman,  Sachs & Co., the Trust's  distributor  prior to May 1, 1999, was the
only  affiliated  broker  utilized  by the  Trust  during  the  fiscal  year.  2
Percentage  of  total   commissions  paid.  3  Percentage  of  total  amount  of
transactions  involving the payment of commissions  effected through  affiliated
persons.
</TABLE>


<PAGE>


Portfolio Valuation

         U.S. and foreign investments held by a Portfolio are valued at the last
quoted  sales  price on the  exchange  on which such  securities  are  primarily
traded,  except that securities  listed on an exchange in the United Kingdom are
valued at the  average of the  closing  bid and ask  prices.  If any  securities
listed on a U.S.  securities  exchange are not traded on a valuation  date, they
will be valued at the last quoted bid price.  If securities  listed on a foreign
securities  exchange are not traded on a valuation  date, they will be valued at
the most recent  quoted  trade  price.  Securities  which are traded in the U.S.
over-the-counter  markets  are valued at the last  quoted bid price.  Securities
which are traded in the foreign  over-the-counter markets are valued at the last
sales price, except that such securities traded in the United Kingdom are valued
at the average of the closing bid and ask prices. Shares of investment companies
held by the Portfolios will be valued at their respective net asset values.  Any
securities,  including restricted  securities,  for which current quotations are
not readily  available  are valued at fair value as  determined in good faith by
the  Investment  Adviser  under  the  supervision  of  the  Board  of  Trustees.
Short-term investments are valued at amortized cost which the Investment Adviser
has  determined,  pursuant to Board  authorization,  approximates  market value.
Securities may be valued on the basis of prices provided by independent  pricing
services  when such prices are believed to reflect the fair market value of such
securities.

Co-Administrators and Distributor

         Effective  May 1,  1999,  Northern  and  PFPC  (formerly  FDISG),  4400
Computer Drive,  Westborough,  Massachusetts 01581, act as co-administrators for
the Portfolios under a  Co-Administration  Agreement with the Trust.  Subject to
the general supervision of the Trust's Board of Trustees, Northern and PFPC (the
"Co-Administrators")   provide   supervision  of  all  aspects  of  the  Trust's
non-investment  advisory  operations and perform various corporate  secretarial,
treasury and blue sky services,  including  but not limited to: (a)  maintaining
office  facilities  and  furnishing   corporate  officers  for  the  Trust;  (b)
furnishing  data  processing  services,  clerical  services,  and  executive and
administrative  services  and  standard  stationery  and  office  supplies;  (c)
performing  all  functions  ordinarily  performed  by the office of a  corporate
treasurer,  and  furnishing  the services  and  facilities  ordinarily  incident
thereto,  such as expense  accrual  monitoring and payment of the Trust's bills,
preparing  monthly  reconciliation  of the  Trust's  expense  records,  updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to their customers who are the beneficial owners of shares.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators are entitled to a fee from each Portfolio,  computed daily and
payable  monthly,  at an annual rate of .15% of the average  daily net assets of
each of the International Equity Index and International Growth Portfolios,  and
 .10%  of  the   average   daily  net  assets  of  each  other   Portfolio.   The
Co-Administrators  will  reimburse  each  Portfolio for its expenses  (including
administration  fees payable to the  Co-Administrators,  but excluding  advisory
fees,  transfer agency fees,  servicing fees and  extraordinary  expenses) which
exceed  on an  annualized  basis  .25% of the  International  Equity  Index  and
International Growth Portfolios' respective average daily net assets and .10% of
each other Portfolio's average daily net assets.

         For the fiscal year ended  November  30,  1999,  the  Co-Administrators
received fees under the  Co-Administration  Agreement  with the Trust (after fee
waivers) (except for the Mid Cap Growth,  MarketCommand and Small Company Growth
Portfolios,  which did not commence  operations during the period) in the amount
of:

                                                                 1999

Balanced Portfolio                                           $      13,090
Equity Index Portfolio                                         1,025,613
Diversified Growth Portfolio                                       108,740
Focused Growth Portfolio                                             91,436
Small Company Index Portfolio                                    (344,810)
International Equity index Portfolio                                  7,197
International Growth Portfolio                                    127,839


         Prior to May 1, 1999, Goldman,  Sachs & Co. ("Goldman Sachs"), 85 Broad
Street, New York, New York 10004, acted as the Trust's administrator pursuant to
an  administration  agreement  substantially  similar  to the  Co-Administration
Agreement  currently in effect with  Northern and PFPC.  For the fiscal years or
periods ended  November 30 as indicated,  Goldman Sachs  received fees under its
administration agreement with the Trust (after fee waivers) in the amount of:

<TABLE>
<CAPTION>
<S>                                                         <C>                       <C>                <C>

                                                             December 1, 1998
                                                                   through
                                                                April 30, 1999          1998              1997

Balanced Portfolio                                                              $      $    59,575        $   54,096
Equity Index Portfolio                                                                   1,136,850           830,785
Diversified Growth Portfolio                                                               164,560           144,576
Focused Growth Portfolio                                                                   130,709           116,431
Small Company Index Portfolio                                                              124,365           121,184
International Growth Portfolio                                                             163,058           159,139
International Equity Index Portfolio1                                                       70,396            26,233

- ------------------
1 Commenced investment operations on April 1, 1997.
</TABLE>


         Prior to May 1,  1997,  Goldman  Sachs  voluntarily  agreed  to waive a
portion of its administration  fee for each Portfolio  resulting in an effective
fee of .10% of the average  daily net assets for each  Portfolio.  The effect of
these  waivers  by  Goldman  Sachs  was to  reduce  administration  fees  by the
following  amounts  for  the  fiscal  years  or  periods  ended  November  30 as
indicated:

<TABLE>
<CAPTION>
<S>                                                              <C>                      <C>                 <C>


                                                                  December 1, 1998
                                                                    through April
                                                                       30, 1999             1998                    1997

Balanced Portfolio                                                                           $0               $   32,260
Equity Index Portfolio                                                                        0                   52,050
Diversified Growth Portfolio                                                                  0                   68,234
Focused Growth Portfolio                                                                      0                   63,979
Small Company Index Portfolio                                                                 0                   65,061
International Growth Portfolio                                                                0                   68,541
International Equity Index Portfolio1                                                         0                    1,460

- ------------------
1 Commenced investment operations on April 1, 1997.

</TABLE>



         In addition,  pursuant to an undertaking that commenced August 1, 1992,
Goldman   Sachs  agreed  that,   if  its   administration   fees  (less  expense
reimbursements  paid by Goldman  Sachs to the Trust and less  certain  marketing
expenses paid by Goldman Sachs) exceeded a specified  amount ($1 million for the
Trust's  first twelve  investment  portfolios  plus $50,000 for each  additional
portfolio)  during the current fiscal year,  Goldman Sachs would waive a portion
of its  administration  fees during the  following  fiscal  year.  There were no
waivers pursuant to this agreement during the last three fiscal years.

         Goldman Sachs had agreed each year to reimburse  each Portfolio for its
expenses  (including  fees  payable  to  Goldman  Sachs  as  administrator,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceeded on an annualized basis .25% of the International Equity
Index and International  Growth Portfolios'  respective average daily net assets
and .10% of each other  Portfolio's  average  daily net assets.  Prior to May 1,
1997, this  undertaking was voluntary with respect to the Portfolios.  As of May
1, 1997, this  undertaking was contractual  with respect to all Portfolios.  The
effect of these  reimbursements by Goldman Sachs for the fiscal years or periods
ended November 30 as indicated were to reduce the expenses of each Portfolio by:



<TABLE>
<CAPTION>
<S>                                                   <C>                              <C>                <C>

                                                       December 1, 1998 through
                                                            April 30, 1999              1998              1997

Balanced Portfolio                                                                       $  78,916         $  74,341
Equity Index Portfolio                                                                     504,482           304,060
Diversified Growth Portfolio                                                                82,995            89,069
Focused Growth Portfolio                                                                    83,616            79,410
Small Company Index Portfolio                                                              282,541           128,881
International Growth Portfolio                                                              49,890            67,398
International Equity Index Portfolio1                                                       98,328            56,393
- ------------------
1 Commenced investment operations on April 1, 1997.

</TABLE>

         Unless sooner terminated, the Co-Administration Agreement will continue
in effect until April 30, 2001, and  thereafter  for  successive  one-year terms
with respect to each Portfolio, provided that the Agreement is approved annually
(1) by the Board of Trustees or (2) by the vote of a majority of the outstanding
shares of such Portfolio (as defined below under "Other Information"),  provided
that in either  event the  continuance  is also  approved  by a majority  of the
Trustees who are not parties to the Agreement and who are not interested persons
(as defined in the 1940 Act) of any party  thereto,  by vote cast in person at a
meeting called for the purpose of voting on such approval. The Co-Administration
Agreement is terminable at any time after April 30, 2001 without  penalty by the
Trust  on at  least  60  days  written  notice  to the  Co-Administrators.  Each
Co-Administrator may terminate the  Co-Administration  Agreement with respect to
itself at any time  after  April 30,  2001  without  penalty on at least 60 days
written notice to the Trust and the other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30, 2001 in the event that the Trust or its shareholders incur damages in excess
of $100,000 as a result of the willful  misfeasance,  bad faith or negligence of
the  Co-Administrators,  or the  reckless  disregard  of their  duties under the
Agreement. The Trust may also terminate the Co-Administration Agreement prior to
April 30, 2001 in the event that the  Co-Administrators  fail to meet one of the
performance standards set forth in the Agreement.

         The  Trust  has  entered  into a  Distribution  Agreement  under  which
Northern  Funds  Distributors,  LLC,  ("NFD")  as  agent,  sells  shares of each
Portfolio on a continuous  basis. NFD pays the cost of printing and distributing
prospectuses  to  persons  who  are not  shareholders  of the  Trust  (excluding
preparation and typesetting expenses) and of certain other distribution efforts.
No compensation is payable by the Trust to NFD for such  distribution  services.
NFD is a wholly-owned subsidiary of Provident  Distributors,  Inc. ("PDI"). PDI,
based in West Conshohocken, Pennsylvania, is an independently owned and operated
broker-dealer.   Between  May  1,  1999  and  November  30,  1999,   First  Data
Distributors,  Inc.  ("FDDI")  acted as the  Trust's  distributor  pursuant to a
distribution  agreement  substantially  similar  to the  Distribution  Agreement
currently in effect with NFD.  Prior to May 1, 1999,  Goldman Sachs acted as the
Trust's distributor pursuant to a distribution  agreement  substantially similar
to the Distribution Agreement currently in effect with NFD.


         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust  will  indemnify  NFD  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by NFD, or those resulting from the willful misfeasance, bad faith or negligence
of NFD's, or NFD's breach of confidentiality.



         Under a Service Mark License  Agreement (the "License  Agreement") with
NFD,  Northern Trust  Corporation  agrees that the name "Northern  Institutional
Funds" may be used in connection with Northern  Institutional Funds' business on
a  royalty-free  basis.  Northern Trust  Corporation  has reserved to itself the
right to grant the non-exclusive right to use the name ("Northern  Institutional
Funds") to any other person. The License Agreement provides that at such time as
the  License  Agreement  is no longer in effect  NFD will  cease  using the name
"Northern Institutional Funds."


Shareholder Servicing Plan

         As stated in the  Portfolios'  Prospectus,  Servicing  Agents may enter
into servicing agreements with the Trust under which they provide (or arrange to
have  provided)  support  services to their  Customers  or other  investors  who
beneficially own such shares in consideration of the Portfolios'  payment of not
more than .15% and .25% (on an annualized  basis) of the average daily net asset
value of the  Class C and D  Shares,  respectively,  beneficially  owned by such
Customers or investors.

     For the  fiscal  years or  periods  ended  November  30 as  indicated,  the
aggregate  amount of the Shareholder  Service Fee incurred by each class of each
Portfolio then in existence was as follows:


<TABLE>
<CAPTION>
<S>                                                        <C>                   <C>                 <C>

                                                              1999                 1998                 1997

Balanced Portfolio
         Class C                                            $   1,895            $   7,927           $   8,026
         Class D                                                1,301                1,860                 710
Equity Index Portfolio
         Class C                                              167,443              148,096              99,924
         Class D                                               51,644               84,248              52,360
Diversified Growth Portfolio
         Class D                                                1,129                2,669               1,466
Focused Growth Portfolio
         Class C                                               15,098               13,754              11,222
         Class D                                                2,340                4,375               2,037
Small Company Index Portfolio
         Class C1                                                 284                  338                 N/A
         Class D                                                1,427                2,173                 993
International Growth Portfolio
         Class D                                                  128                  825                 379
International Equity Index Portfolio
         Class D2                                                  32                    5                 N/A

- -----------------------------
1        Class C Shares were issued on January 8, 1998.
2        Class D Shares were issued on October 5, 1998.
</TABLE>

         Services  provided by or arranged  to be provided by  Servicing  Agents
under their servicing  agreements may include:  (1) establishing and maintaining
separate  account  records  of  Customers  or  other  investors;  (2)  providing
Customers or other  investors with a service that invests their assets in shares
of certain  classes  pursuant to specific or  pre-authorized  instructions,  and
assistance  with  new  account  applications;  (3)  aggregating  and  processing
purchase and redemption requests for shares of certain classes from Customers or
other investors,  and placing  purchase and redemption  orders with the Transfer
Agent;  (4) issuing  confirmations to Customers or other investors in accordance
with  applicable  law;  (5)  arranging  for the  timely  transmission  of  funds
representing  the net purchase  price or  redemption  proceeds;  (6)  processing
dividend  payments on behalf of  Customers  or other  investors;  (7)  providing
information periodically to Customers or other investors showing their positions
in shares;  (8)  responding to Customer or other investor  inquiries  (including
requests for prospectuses), and complaints relating to the services performed by
the  Servicing  Agents;  (9) acting as liaison with respect to all inquiries and
complaints  from Customers and other investors  relating to errors  committed by
the Trust or its  agents,  and  other  matters  pertaining  to the  Trust;  (10)
providing or arranging for another person to provide  subaccounting with respect
to shares of certain classes beneficially owned by Customers or other investors;
(11) if required by law,  forwarding  shareholder  communications from the Trust
(such  as  proxy  statements  and  proxies,   shareholder  reports,  annual  and
semi-annual financial statements and dividend,  distribution and tax notices) to
Customers and other investors;  (12) providing such office space, facilities and
personnel  as may be  required to perform  their  services  under the  servicing
agreements;  (13) maintaining  appropriate  management reporting and statistical
information;  (14) paying expenses related to the preparation of educational and
other  explanatory  materials in  connection  with the  development  of investor
services; (15) developing and monitoring investment programs; and (16) providing
such other similar  services as the Trust may  reasonably  request to the extent
the Servicing Agents are permitted to do so under applicable statutes, rules and
regulations.

         The Trust's  agreements  with  Servicing  Agents are governed by a Plan
(called the "Shareholder  Servicing Plan"),  which has been adopted by the Board
of Trustees.  Pursuant to the Shareholder  Servicing Plan, the Board of Trustees
will review, at least quarterly,  a written report of the amounts expended under
the Trust's  agreements  with  Servicing  Agents and the  purposes for which the
expenditures were made. In addition, the arrangements with Servicing Agents must
be  approved  annually  by a  majority  of the Board of  Trustees,  including  a
majority of the  Trustees  who are not  "interested  persons"  of the Trust,  as
defined in the 1940 Act,  and have no direct or indirect  financial  interest in
such arrangements.

         The Board of Trustees  has  approved the  arrangements  with  Servicing
Agents based on information  provided by the Trust's  service  contractors  that
there  is a  reasonable  likelihood  that  the  arrangements  will  benefit  the
Portfolios  and  their   shareholders   by  affording  the  Portfolios   greater
flexibility  in connection  with the servicing of the accounts of the beneficial
owners of their shares in an efficient manner.

Counsel and Auditors

     Drinker  Biddle & Reath LLP,  with  offices at One Logan  Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.

         _____________,  independent  auditors,  233 S. Wacker  Drive,  Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit  services,  ______________  reviews  the  Trust's  Federal  and  state tax
returns,  and provides  consultation  and  assistance  on  accounting,  internal
control and related matters.

In-Kind Purchases and Redemptions

         Payment for shares of a Portfolio  may, in the  discretion of Northern,
be made in the form of  securities  that  are  permissible  investments  for the
Portfolio as described in the  Prospectus.  For further  information  about this
form of payment,  contact  Northern.  In connection  with an in-kind  securities
payment,  a Portfolio will require,  among other things,  that the securities be
valued on the day of purchase in accordance with the pricing methods used by the
Portfolio and that the Portfolio  receive  satisfactory  assurances that it will
have  good and  marketable  title to the  securities  received  by it;  that the
securities  be in proper form for transfer to the  Portfolio;  and that adequate
information be provided  concerning the basis and other tax matters  relating to
the securities.

         The additional transaction fee described in the Prospectus with respect
to the  Small  Company  Index  Portfolio  and  the  International  Equity  Index
Portfolio  does not apply to in-kind  purchases of shares that are structured to
minimize the related brokerage,  market impact costs and other transaction costs
to such Portfolios as described in the Prospectus.

         Although each  Portfolio  generally  will redeem  shares in cash,  each
Portfolio  reserves the right to pay  redemptions by a  distribution  in kind of
securities (instead of cash) from such Portfolio.  The securities distributed in
kind would be readily  marketable and would be valued for this purpose using the
same method  employed in calculating  the Portfolio's net asset value per share.
If a shareholder  receives  redemption  proceeds in kind, the shareholder should
expect  to incur  transaction  costs  upon  the  disposition  of the  securities
received in the redemption.


PERFORMANCE INFORMATION

         The  performance of a class of shares of a Portfolio may be compared to
those of other  mutual  funds with similar  investment  objectives  and to bond,
stock and other relevant indices or to rankings prepared by independent services
or other  financial or industry  publications  that monitor the  performance  of
mutual funds. For example,  the performance of a class of shares may be compared
to data prepared by Lipper Analytical Services, Inc. or other independent mutual
fund reporting services. In addition, the performance of a class may be compared
to the  Lehman  Brothers  Government/Corporate  Bond  Index (or its  components,
including the Treasury Bond Index),  S&P 500 Index,  S&P/Barra Growth Index, the
Russell 2000 Index,  the EAFE Index or other  unmanaged  stock and bond indices,
including, but not limited to, the Merrill Lynch 1-5 Year Government Bond Index,
the Merrill Lynch 1-5 Year  Corporate/Government  Bond Index,  the 3-month LIBOR
Index,  the 91-day  Treasury Bill Rate,  the Composite  Index,  the J.P.  Morgan
Non-U.S.  Government  Bond  Index,  and  the Dow  Jones  Industrial  Average,  a
recognized  unmanaged index of common stocks of 30 industry  companies listed on
the New York Stock Exchange.  Performance data as reported in national financial
publications such as Money Magazine,  Morningstar,  Forbes,  Barron's,  The Wall
Street Journal and The New York Times, or in publications of a local or regional
nature,  may also be used in comparing the performance of a class of shares of a
Portfolio.

         The Portfolios  calculate  their total returns for each class of shares
separately  on an "average  annual  total  return"  basis for  various  periods.
Average  annual total return  reflects the average annual  percentage  change in
value of an investment in the class over the measuring period. Total returns for
each class of shares may also be calculated on an "aggregate total return" basis
for various periods. Aggregate total return reflects the total percentage change
in value over the measuring  period.  Both methods of  calculating  total return
reflect  changes in the price of the shares and assume  that any  dividends  and
capital gain  distributions made by the Portfolio with respect to a class during
the period are reinvested in the shares of that class. When considering  average
total return  figures for periods  longer than one year, it is important to note
that the annual  total  return of a class for any one year in the  period  might
have been more or less than the average for the entire  period.  The  Portfolios
may also  advertise from time to time the total return of one or more classes of
shares on a year-by-year or other basis for various  specified  periods by means
of quotations, charts, graphs or schedules.

         Each Portfolio that  advertises an "average  annual total return" for a
class  of  shares  computes  such  return  by  determining  the  average  annual
compounded  rate of return  during  specified  periods  that equates the initial
amount invested to the ending  redeemable value of such investment  according to
the following formula:
                                               P(1 + T)n = ERV

1
Where:   T =  average annual total return;

     ERV = ending  redeemable  value  at the end of the  applicable  period  (or
fractional  portion  thereof)  of a  hypothetical  $1,000  payment  made  at the
beginning of the period;

                  P =  hypothetical initial payment of $1,000; and

                  n = period covered by the  computation,  expressed in terms of
                  years.

         Each Portfolio that advertises an "aggregate  total return" for a class
of shares computes such return by determining the aggregate  compounded rates of
return during specified periods that likewise equate the initial amount invested
to the ending  redeemable value of such investment.  The formula for calculating
aggregate total return is as follows:

T = [(ERV/P)]-1

2

         The Small Company Index and  International  Equity Index Portfolios may
advertise  total return data  without  reflecting  the .50% and 1.00%  portfolio
transaction fee in accordance with the rules of the SEC. Quotations which do not
reflect the fee will, of course, be higher than quotations which do.

         The  calculations  set  forth  below  are  made  assuming  that (1) all
dividends and capital gain  distributions  are  reinvested  on the  reinvestment
dates  at the  price  per  share  existing  on the  reinvestment  date,  (2) all
recurring  fees charged to all  shareholder  accounts are included,  and (3) the
portfolio  transaction  fee is taken into account for purchases of shares of the
Small Company Index Portfolio and the International Equity Index Portfolio.  The
ending  redeemable  value  (variable  "ERV" in the  formula)  is  determined  by
assuming complete  redemption of the hypothetical  investment after deduction of
all  nonrecurring  charges  at the end of the  measuring  period.  Total  return
calculations  excluding  the  transaction  fee are also  provided  for the Small
Company Index Portfolio and the International Equity Index Portfolio.

         The average  annual total  returns and  aggregate  total  returns shown
below  for  the  Diversified   Growth,   Equity  Index,   Small  Company  Index,
International Growth, MarketCommand,  and Mid Cap Growth Portfolios include, for
periods prior to the commencement of the Portfolios' operations, the performance
of predecessor  collective  funds adjusted to reflect the higher  estimated fees
and expenses  applicable to such Portfolios' Class A Shares at the time of their
inception.  Although  all such  predecessor  collective  funds  were  managed by
Northern  for  the  periods  stated  in a  manner  and  pursuant  to  investment
objectives that were  equivalent in all material  respects to the management and
investment  objectives  of  the  corresponding   Portfolios,   such  predecessor
collective  funds were not registered under the 1940 Act and were not subject to
certain  investment  restrictions  imposed  by the  1940  Act.  If they had been
registered under the 1940 Act,  performance might have been adversely  affected.
The average  annual total  returns and  aggregate  total  returns  shown for the
Portfolios for their Class C and/or Class D Shares also include, for the periods
prior to the inception of such classes, the performance of the Portfolios' Class
A Shares.  Because  the fees and  expenses  of Class C and  Class D Shares  are,
respectively,  0.24%  and 0.39%  higher  than  those of Class A  Shares,  actual
performance  for periods  prior to the  inception  of Class C and Class D Shares
would  have been  lower if such  higher  fees and  expenses  had been taken into
account.


         Following commencement of operations of the Portfolios, prior to May 1,
1999, Goldman Sachs reimbursed expenses to the Portfolios and voluntarily agreed
to reduce a portion of its administration fee for each Portfolio pursuant to the
undertaking    described   above   under   "Additional   Trust   Information   -
Co-Administrators and Distributor" and "Investment Advisers,  Transfer Agent and
Custodian," and Northern  waived a portion of its investment  advisory fees with
respect to the Portfolios.  The average annual total returns and aggregate total
returns of each  Portfolio  with respect to Class A, Class C and Class D Shares,
as  applicable,  are shown below with and  without  such fee waivers and expense
reimbursements.





<PAGE>


For Periods Ended November 30, 1999

<TABLE>
<CAPTION>
<S>                      <C>               <C>    <C>     <C>                   <C>                <C>           <C>      <C>

                         Average Annual
                         Total Returns (%)                                      Aggregate Total Returns (%)

                         Since Inception  1 Year  5 Year  10 Year               Since Inception     1 Year       5 Year   10 Year
Diversified Growth1
Class A
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class D
  With fee waivers and
  Expense reimbursements
  Without fee waivers and -
  Expense reimbursements
Focused Growth2
Class A
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class C
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class D
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Equity Index3
Class A
  With fee waivers and   -
  Expense reimbursements
  Without fee waivers and  -
  Expense reimbursements
Class C
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class D
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Small Company Index4
Class A
  With fee waivers and Expense reimbursements And portfolio transaction fee With
  fee waivers and Expense  reimbursements But without portfolio  Transaction fee
  Without fee waivers and Expense  reimbursements But with portfolio Transaction
  fee Without fee waivers and Expense  reimbursements And portfolio  transaction
  fee
</TABLE>



Small Company Index4
Class C
 With fee waivers and Expense  reimbursements and portfolio transaction fee With
 fee waivers and expense  reimbursements  but without portfolio  transaction fee
 Without fee waivers and expense  reimbursements but with portfolio  transaction
 fee Without fee waivers and expense  reimbursements  and portfolio  transaction
 fee

Class D
 With fee waivers and Expense  reimbursements and portfolio transaction fee With
 fee waivers and expense  reimbursements  but without portfolio  transaction fee
 Without fee waivers and expense  reimbursements but with portfolio  transaction
 fee Without fee waivers and expense  reimbursements  and portfolio  transaction
 fee
MarketCommand5
Class A
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class C
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class D
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Mid Cap Growth6
Class A
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class C
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class D
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements


<PAGE>


International Growth7
Class A
 With fee waivers and
 Expense reimbursements
 Without fee waivers and
 Expense reimbursements
Class D
 With fee waivers and
 Expense reimbursements
 Without fee waivers and
 Expense reimbursements
Balanced8
Class A
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class C
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
Class D
  With fee waivers and
  Expense reimbursements
  Without fee waivers and
  Expense reimbursements
International Equity Index9
Class A
  With fee waivers and Expense reimbursements And portfolio transaction fee With
  fee waivers and expense  Reimbursements but without Portfolio  transaction fee
  Without fee waivers and
  Expense  reimbursements but with Portfolio transaction fee Without fee waivers
  and Expense reimbursements And portfolio transaction fee
Class D
  With fee waivers and
  Expense reimbursements
  And portfolio transaction fee

  With fee waivers and expense
  Reimbursements but without
  Portfolio transaction fee

  Without fee waivers and
  Expense reimbursements but with
  Portfolio transaction fee

  Without fee waivers and
  Expense reimbursements
  And portfolio transaction fee



<PAGE>



- ----------------------

[This will be updated when the numbers are updated]
1. For Class A and D Shares,  performance  information prior to January 11, 1993
(commencement of Portfolio) is that of a predecessor  collective fund. For Class
D Shares,  performance  information  from January 11, 1993 to September 14, 1994
(commencement of Class D Shares) is that of Class A Shares. Because the fees and
expenses of Class D Shares are .39% higher than those of Class A Shares,  actual
performance  would have been lower had such higher fees and expenses  been taken
into account.  The predecessor  collective fund has been managed in a manner and
pursuant to investment  objectives  equivalent  in all material  respects to the
management and investment  objective of the Portfolio for the periods shown. The
performance  information  of the  predecessor  collective  fund is  adjusted  to
reflect the higher fees and expenses applicable to Class A Shares at the time of
their inception.

2. For  Class C and Class D  Shares,  performance  from July 1, 1993 to June 14,
1996  (commencement  of Class C Shares) and  December 8, 1994  (commencement  of
Class D  Shares),  respectively,  is that of  Class  A  Shares.  Class A  Shares
commenced  operations on July 1, 1993.  Because the fees and expenses of Class C
and Class D Shares are .24% and .39%, respectively, higher than those of Class A
Shares,  actual  performance would have been lower had such higher expenses been
taken into account.

3. For Class A, C and D Shares,  performance  information  prior to January  11,
1993  (commencement of Portfolio) is that of a predecessor  collective fund. For
Class C and D Shares, performance information from January 11, 1993 to September
28, 1995  (commencement of Class C Shares) and September 14, 1994  (commencement
of Class D Shares),  respectively,  is that of Class A Shares.  Because the fees
and  expenses  of Class C and Class D Shares  are .24% and  .39%,  respectively,
higher than those of Class A Shares,  actual  performance  would have been lower
had such higher  fees and  expenses  been taken into  account.  The  predecessor
collective  fund has  been  managed  in a  manner  and  pursuant  to  investment
objectives  equivalent in all material respects to the management and investment
objective of the Portfolio for the periods shown. The performance information of
the  predecessor  collective  fund is  adjusted  to reflect  the higher fees and
expenses applicable to Class A Shares at the time of their inception.

4. For Class A, C and D Shares,  performance  information  prior to January  11,
1993  (commencement of Portfolio) is that of a predecessor  collective fund. For
Class C and D Shares,  performance  information from January 11, 1993 to January
8, 1998  (commencement of Class C Shares) and December 8, 1994  (commencement of
Class D Shares),  respectively,  is that of Class A Shares. Because the fees and
expenses of Class C and Class D Shares are .24% and .39%,  respectively,  higher
than those of Class A Shares,  actual performance would have been lower had such
higher fees and expenses been taken into account. Performance information of the
predecessor  collective  fund is shown  from  August  1,  1988  (the  date  such
collective  fund was  first  managed  in a manner  and  pursuant  to  investment
objectives  equivalent in all material respects to the management and investment
objective  of the  Portfolio)  and is  adjusted  to reflect  the higher fees and
expenses applicable to Class A Shares at the time of their inception.

5. For Class A, C and D Shares performance  information is that of a predecessor
collective  fund. The  predecessor  collective fund has been managed in a manner
and pursuant to investment objectives equivalent in all material respects to the
management and investment  objective of the Portfolio for the periods shown. The
performance  information  of the  predecessor  collective  fund is  adjusted  to
reflect the higher fees and  expenses  applicable  to Class A, C and D Shares at
the time of their inception.

6. For Class A, C and D Shares performance  information is that of a predecessor
collective  fund. The  predecessor  collective fund has been managed in a manner
and pursuant to investment objectives equivalent in all material respects to the
management and investment  objective of the Portfolio for the periods shown. The
performance  information  of the  predecessor  collective  fund is  adjusted  to
reflect the higher fees and  expenses  applicable  to Class A, C and D Shares at
the time of their inception.

7. For Class A and Class D Shares,  performance  information  prior to March 28,
1994  (commencement of Portfolio) is that of a predecessor  collective fund. For
Class D Shares, performance information from March 28, 1994 to November 16, 1994
(commencement of Class D Shares) is that of Class A Shares. Because the fees and
expenses of Class D Shares are .39% higher than those of Class A Shares,  actual
performance  would have been lower had such higher fees and expenses  been taken
into account.  Performance  information of the  predecessor  collective  fund is
shown  from July 1, 1990 (the date such fund was first  managed  in a manner and
pursuant to investment  objectives  equivalent  in all material  respects to the
management and investment objective of the Portfolio) and is adjusted to reflect
the higher fees and expenses  applicable  to Class A Shares at the time of their
inception.

8. For Class C and Class D Shares, performance from July 1, 1993 to December 29,
1995  (commencement  of Class C Shares) and February 20, 1996  (commencement  of
Class D  Shares),  respectively,  is that of  Class  A  Shares.  Class A  Shares
commenced  operations on July 1, 1993.  Because the fees and expenses of Class C
and Class D Shares are .24% and .39%, respectively, higher than those of Class A
Shares,  actual  performance  would  have been  lower had such  higher  fees and
expenses been taken into account.

9. For  Class D  Shares,  performance  from  April 1,  1997 to  October  5, 1998
(commencement  of  Class D  Shares)  is that of Class A  Shares.  Class A Shares
commenced  operations on April 1, 1997. Because the fees and expenses of Class D
Shares are .39% higher than those of Class A Shares,  actual  performance  would
have been lower had such higher fees and expenses been taken into account.



<PAGE>


                                                            B-115


         The yield of a class of shares in the  Balanced  Portfolio  is computed
based on the net  income of such class  during a 30-day  (or one  month)  period
(which  period  will be  identified  in  connection  with the  particular  yield
quotation).  More  specifically,  the Portfolio's yield for a class of shares is
computed by dividing  the per share net income for the class during a 30-day (or
one month) period by the net asset value per share on the last day of the period
and annualizing the result on a semi-annual basis.

     The Balanced Portfolio  calculates its 30-day (or one month) standard yield
for a class of shares in  accordance  with the method  prescribed by the SEC for
mutual
funds:

                               Yield = 2[{(a-b/cd) + 1}to the power of 6 ] - 1

3

Where:             a = dividends and interest earned during the period;

                   b = expenses accrued for the period (net of reimbursements);

                   c = average daily number of shares  outstanding during the
period entitled to receive dividends; and

                      d = net  asset  value  per  share  on the  last day of the
period.

         For the 30-day period ended November 30, 1999,  the  annualized  yields
for the Class A, Class C and Class D Shares of the Balanced Portfolio was ____%,
____% and  ____%,  respectively.  During  such  period,  [the  Co-Administrators
reimbursed  expenses to the Portfolio and voluntarily agreed to reduce a portion
of   its   administration   fees   under   "Additional   Trust   Information   -
Co-Administrators  and  Distributor,"  and  Northern  waived  a  portion  of its
investment  advisory fees with respect to the Portfolio.] In the absence of such
advisory and administration fee reductions and expense  limitations,  the 30-day
yield for Class A, Class C and Class D Shares  would have been ____%,  ____% and
____%, respectively.

         Because  of the  different  servicing  fees and  transfer  agency  fees
payable  with  respect  to Class A, C and D Shares in a  Portfolio,  performance
quotations  for shares of Class C and D of the Portfolio  will be lower than the
quotations for Class A Shares of the Portfolio, which will not bear any fees for
shareholder support services and will bear minimal transfer agency fees.

         The  performance  of each class of shares of the Portfolios is based on
historical  earnings,  will  fluctuate  and is not  intended to indicate  future
performance.  The  investment  return and principal  value of an investment in a
class will  fluctuate  so that when  redeemed,  shares may be worth more or less
than their original cost.  Performance  information  may not provide a basis for
comparison with bank deposits and other  investments which provide a fixed yield
for a stated  period of time.  Total  return data should also be  considered  in
light of the risks associated with a Portfolio's composition, quality, maturity,
operating  expenses  and market  conditions.  Any fees  charged by  Institutions
directly  to  their  Customer  accounts  in  connection  with  investments  in a
Portfolio will not be included in calculations of performance information.

TAXES

         The  following   summarizes   certain   additional  tax  considerations
generally affecting the Portfolios and their shareholders that are not described
in the Prospectus.  No attempt is made to present a detailed  explanation of the
tax treatment of the Portfolios or their shareholders,  and the discussions here
and in the Prospectus are not intended as a substitute for careful tax planning.
Potential investors should consult their tax advisers with specific reference to
their own tax situations.

         The  discussions  of  tax  consequences  in  the  Prospectus  and  this
Additional  Statement are based on the Code and the laws and regulations  issued
thereunder  as in  effect  on the  date of  this  Additional  Statement.  Future
legislative  or  administrative  changes or court  decisions  may  significantly
change the conclusions  expressed herein,  and any such changes or decisions may
have a retroactive effect with respect to the transactions contemplated herein.

Federal - General Information

         Each  Portfolio  intends to qualify as a regulated  investment  company
under Part I of  Subchapter M of Subtitle A, Chapter 1, of the Internal  Revenue
Code of 1986, as amended (the "Code"). As a regulated  investment company,  each
Portfolio is  generally  exempt from  federal  income tax on its net  investment
income and realized capital gains which it distributes to shareholders, provided
that it distributes an amount equal to at least the sum of 90% of its tax-exempt
income and 90% of its investment  company taxable income (net investment  income
and the excess of net short-term  capital gain over net long-term capital loss),
if any, for the year (the  "Distribution  Requirement")  and  satisfies  certain
other requirements of the Code that are described below.

         In addition  to  satisfaction  of the  Distribution  Requirement,  each
Portfolio  must derive with  respect to a taxable year at least 90% of its gross
income from dividends,  interest,  certain  payments with respect to securities,
loans and gains from the sale or other  disposition  of stock or  securities  or
foreign  currencies,  or from income  derived  with  respect to its  business of
investing in such stock, securities, or currencies (the "Income Requirement").

         In addition to the foregoing requirements, at the close of each quarter
of its taxable year, at least 50% of the value of each  Portfolio's  assets must
generally consist of cash and cash items, U.S. Government securities, securities
of other regulated investment companies,  and securities of other issuers (as to
which as  Portfolio  has not  invested  more  than 5% of the  value of its total
assets in  securities  of such issuer and as to which a Portfolio  does not hold
more than 10% of the outstanding voting securities of such issuer),  and no more
than 25% of the value of each  Portfolio's  total  assets may be invested in the
securities  of any  one  issuer  (other  than  U.S.  Government  securities  and
securities of other regulated investment  companies),  or in two or more issuers
which  such  Portfolio  controls  and which are  engaged  in the same or similar
trades or businesses.


         In the case of corporate shareholders, distributions of a Portfolio for
any taxable year generally qualify for the dividends  received  deduction to the
extent of the gross amount of "qualifying  dividends" from domestic corporations
received by the Portfolio for the year. A dividend  usually will be treated as a
"qualifying  dividend" if it has been  received from a domestic  corporation.  A
portion of the dividends paid by the Balanced, Equity Index, Diversified Growth,
Focused  Growth,  Small  Company  Growth,  Mid Cap  Growth,  MarketCommand,  and
potentially   International  Growth  Portfolios,   may  constitute   "qualifying
dividends." The other  Portfolios,  however,  are not expected to pay qualifying
dividends.

         If for any taxable year any  Portfolio  does not qualify as a regulated
investment company,  all of its taxable income will be subject to tax at regular
corporate rates without any deduction for distributions to shareholders. In such
event,  all  distributions  would be taxable as ordinary income to the extent of
such  Portfolio's  current  and  accumulated  earnings  and profits and would be
eligible  for  the  dividends  received  deduction  in  the  case  of  corporate
shareholders.

         The Code imposes a non-deductible 4% excise tax on regulated investment
companies  that  fail to  currently  distribute  an  amount  equal to  specified
percentages of their ordinary taxable income and capital gain net income (excess
of capital gains over capital losses). Each Portfolio intends to make sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar year to avoid liability for this excise tax.

         Although each Portfolio  expects to qualify as a "regulated  investment
company" and to be relieved of all or  substantially  all federal  income taxes,
depending  upon the extent of its  activities in states and  localities in which
its offices are maintained,  in which its agents or independent  contractors are
located  or in which it is  otherwise  deemed to be  conducting  business,  each
Portfolio may be subject to the tax laws of such states or localities.

Taxation of Certain Financial Instruments

         The tax principles  applicable to transactions in financial instruments
and futures  contracts  and options that may be engaged in by a  Portfolio,  and
investments in passive foreign investment companies ("PFICs"),  are complex and,
in  some  cases,  uncertain.  Such  transactions  and  investments  may  cause a
Portfolio to  recognize  taxable  income  prior to the receipt of cash,  thereby
requiring the Portfolio to liquidate other positions,  or to borrow money, so as
to make sufficient  distributions to shareholders to avoid  corporate-level tax.
Moreover, some or all of the taxable income recognized may be ordinary income or
short-term   capital  gain,  so  that  the   distributions  may  be  taxable  to
shareholders as ordinary income.

         In  addition,  in the case of any shares of a PFIC in which a Portfolio
invests,  the  Portfolio may be liable for  corporate-level  tax on any ultimate
gain or  distributions  on the shares if the Portfolio fails to make an election
to recognize income annually during the period of its ownership of the shares.

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on  distributions  by a
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
A  foreign  shareholder  generally  will  not  be  subject  to  U.S.  income  or
withholding  tax in respect of proceeds from or gain on the redemption of shares
or in  respect  of capital  gain  dividends  (i.e.,  dividends  attributable  to
long-term  capital gains of a Portfolio),  provided such  shareholder  submits a
statement,  signed under penalties of perjury,  attesting to such  shareholder's
exempt status. Different tax consequences apply to a foreign shareholder engaged
in a U.S.  trade or  business  or present in the U.S.  for 183 days or more in a
year. Foreign  shareholders should consult their tax advisers regarding the U.S.
and foreign tax consequences of investing in a Portfolio.

DESCRIPTION OF SHARES

         The Trust  Agreement  permits the Trust's Board of Trustees to issue an
unlimited number of full and fractional shares of beneficial  interest of one or
more  separate  series   representing   interests  in  one  or  more  investment
portfolios.  The Trustees may hereafter create series in addition to the Trust's
twenty-one existing series,  which represent interests in the Trust's twenty-one
respective portfolios,  ten of which are discussed in this Additional Statement.
The Trust Agreement also permits the Board of Trustees to classify or reclassify
any unissued  shares into classes within a series.  Pursuant to such  authority,
the Trustees have  authorized  the issuance of an unlimited  number of shares of
beneficial  interest in three separate  classes of shares in each of the Trust's
non-money market portfolios: Class A, C and D Shares.

         Under the terms of the Trust Agreement, each share of each Portfolio is
without par value,  represents an equal proportionate interest in the particular
Portfolio  with  each  other  share of its  class in the same  Portfolio  and is
entitled to such dividends and  distributions out of the income belonging to the
Portfolio as are declared by the Trustees.  Upon any liquidation of a Portfolio,
shareholders  of each class of a Portfolio are entitled to share pro rata in the
net assets  belonging to that class  available for  distribution.  Shares do not
have any preemptive or conversion  rights.  The right of redemption is described
under "About Your  Account -- Selling  Shares" in the  Prospectus.  In addition,
pursuant  to the terms of the 1940 Act,  the  right of a  shareholder  to redeem
shares and the date of payment by a  Portfolio  may be  suspended  for more than
seven  days (a) for any  period  during  which the New York  Stock  Exchange  is
closed, other than the customary weekends or holidays, or trading in the markets
the Portfolio  normally utilizes is closed or is restricted as determined by the
SEC, (b) during any emergency, as determined by the SEC, as a result of which it
is not reasonably  practicable for the Portfolio to dispose of instruments owned
by it or fairly to determine the value of its net assets,  or (c) for such other
period as the SEC may by order permit for the protection of the  shareholders of
the  Portfolio.  The Trust may also suspend or postpone the  recordation  of the
transfer of its shares upon the  occurrence of any of the foregoing  conditions.
In addition, shares of each Portfolio are redeemable at the unilateral option of
the Trust if the Trustees  determine in their sole discretion that failure to so
redeem  may  have  material  adverse  consequences  to the  shareholders  of the
Portfolio. Shares when issued as described in the Prospectus are validly issued,
fully  paid and  nonassessable,  except as stated  below.  In the  interests  of
economy and convenience,  certificates representing shares of the Portfolios are
not issued.

         The proceeds  received by each  Portfolio for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of that Portfolio. The underlying assets
of each  Portfolio  will be  segregated  on the  books of  account,  and will be
charged with the  liabilities  in respect to that  Portfolio and with a share of
the general  liabilities  of the Trust.  Expenses with respect to the Portfolios
are normally  allocated in proportion  to the net asset value of the  respective
Portfolios  except where  allocations of direct expenses can otherwise be fairly
made.

         Rule 18f-2 under the 1940 Act provides that any matter  required by the
provisions  of the  1940  Act or  applicable  state  law,  or  otherwise,  to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
each investment  portfolio affected by such matter.  Rule 18f-2 further provides
that an investment  portfolio  shall be deemed to be affected by a matter unless
the  interests  of each  investment  portfolio  in the matter are  substantially
identical  or the  matter  does  not  affect  any  interest  of  the  investment
portfolio.  Under the Rule, the approval of an investment  advisory agreement or
any change in a fundamental  investment  policy would be effectively  acted upon
with respect to an  investment  portfolio  only if approved by a majority of the
outstanding shares of such investment portfolio. However, the Rule also provides
that  the  ratification  of the  appointment  of  independent  accountants,  the
approval of principal  underwriting  contracts  and the election of Trustees are
exempt  from  the  separate  voting  requirements  stated  above.  In  addition,
shareholders  of each of the classes in a particular  investment  portfolio have
equal  voting  rights  except  that  only  shares  of a  particular  class of an
investment  portfolio will be entitled to vote on matters submitted to a vote of
shareholders  (if any) relating to shareholder  servicing  expenses and transfer
agency fees that are payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting  power of the Trust may elect all of the  Trustees,  irrespective  of the
vote of the other  shareholders.  Meetings of  shareholders of the Trust, or any
series or class thereof, may be called by the Trustees, certain officers or upon
the written  request of holders of 10% or more of the shares entitled to vote at
such  meeting.  To the  extent  required  by  law,  the  Trust  will  assist  in
shareholder  communications in connection with a meeting called by shareholders.
The  shareholders  of the Trust will have voting rights only with respect to the
limited  number of  matters  specified  in the Trust  Agreement  and such  other
matters as the Trustees may determine or may be required by law.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment  (i) that would  adversely  affect  the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust, or any series or class thereof,  or affecting assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless  disregard of the duties  involved in the conduct of his or her office.
The Trust  Agreement  provides for  indemnification  of  Trustees,  officers and
agents of the  Trust  unless  the  recipient  is  liable  by  reason of  willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's office.

         The  Trust  Agreement  provides  that  each  shareholder,  by virtue of
becoming such,  will be held to have expressly  assented and agreed to the terms
of the Trust Agreement and to have become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.
         As  of  December  31,  1999,   substantially  all  of  the  Portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  Portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less than [__%] of the  Trust's  outstanding  shares.  As of the same date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding  shares of each class of each  Portfolio.  Northern  has advised the
Trust that the following  persons  (whose  mailing  address is: c/o The Northern
Trust Company,  50 South LaSalle,  Chicago,  IL 60675)  beneficially  owned five
percent  or more of the  outstanding  shares of the  Portfolios'  classes  as of
December 31, 1999:




<PAGE>

<TABLE>
<CAPTION>
<S>  <C>          <C>                                                           <C>                    <C>


                                                                                    Number              Percentage
                                                                                  of Shares             of Shares
BALANCED PORTFOLIO
     Class A
                  The Northern Trust Thrift Plan                                1,783,705.79                37.9%
                  Gregian Delight, Inc. Employee Profit                           243,075.90                 5.2%
                  Sharing & Savings Plan & Trust
                  Goodyear Tire & Rubber Co.                                      249,468.91                 5.3%
                  Sealed Air Corp.                                                981,398.92                20.8%

     Class C
                  Kitch Drutchas Wagner Kenney PC                                  59,926.13               100.0%

     Class D
                  First National Bank of LaGrange                                  30,548.93               100.0%

DIVERSIFIED GROWTH PORTFOLIO
     Class A
                  The Northern Trust Co. Pension Plan                           5,420,278.59                45.2%
                  U.S. Can Co. Pension Plan                                       639,765.10                 5.3%
                  Seiko Corp.                                                        664,930                 5.5%
     Class D
                  First National Bank of LaGrange                                  31,714.74               100.0%

EQUITY INDEX PORTFOLIO
     Class A
                  The Northern Trust Thrift Plan                                8,827,558.40                15.0%
                  Libbey-Owens-Ford Co.                                         3,356,107.48                 5.7%
                  Army Air Force                                                3,067,384.16                 5.2%
                  Meadows Foundation                                            4,792,344.63                 8.2%

     Class C
                  Wilson Sports Goods 401K Plan                                 1,199,572.72                24.1%
                  American Dental Association                                   1,650,657.37                33.2%
                  Clark Schwebel, Inc.                                            403,297.22                 8.1%
                  U.S. Silica Co.                                                 629,772.56                12.6%
                  Sierra Technologies, Inc.                                       357,988.02                 7.2%
                  Children's Hospital San Diego                                   589,637.26                11.8%

     Class D
                  Marquette Trust Co.                                             554,988.57                76.4%
                  St. Francis Hospital Foundation                                  48,748.23                 6.7%
                  Great Plains Trust Co.                                           59,220.91                 8.2%



<PAGE>



                                                                                    Number              Percentage
                                                                                  of Shares             of Shares
FOCUSED GROWTH PORTFOLIO
     Class A
                  The Northern Trust Thrift Plan                                5,804,096.52                52.0%
                  Doe Run Resources Corp.                                         711,681.78                 6.4%
                  Woodmen Home Office Employees                                   656,904.64                 5.9%

     Class C
                  Kitch Drutchas Wagner Kenney PC                                 644,979.00               100.0%

     Class D
                  First National Bank of LaGrange                                  29,624.36                97.0%

SMALL COMPANY GROWTH PORTFOLIO
     Class A
                  Spertus Institute                                                22,193.48                 5.0%
                  Bearid Industries, Inc. Pension Plan                             29,600.00                 6.7%
                  NalCo Foundation                                                 32,700.00                 7.4%
                  Schulze & Burch Employee Pension Plan                            48,169.56                10.9%
                  Schulze & Burch Biscuit Co.                                      28,901.73                 6.5%
                  Illinois Masonic                                                 36,162.01                 8.2%
                  NiSource - Bay State VEBA                                       109,680.28                24.8%

SMALL COMPANY INDEX PORTFOLIO
     Class A
                  Saxon & Co.                                                   1,503,407.81                  8.2%
                  Lifepoint Hospitals, Inc.                                     1,161,132.31                  6.3%
                  General Dynamics                                              1,818,979.55                  9.9%
                  Pfizer                                                        1,088,879.80                  5.9%
                  PWC Group Investment Savings Plan                             1,082,491.40                  5.9%
                  Masco                                                         1,898,431.09                 10.3%

     Class D
                  BankIllinois Trust Co.                                           30,004.41                 76.6%
                  Great Plains Trust Co.                                            9,182.76                 23.4%



<PAGE>



                                                                                    Number              Percentage
                                                                                  of Shares             of Shares
INTERNATIONAL EQUITY INDEX PORTFOLIO
     Class A
                  The Northern Trust Co. Pension Plan                           1,343,092.99                 28.9%
                  The Northern Trust Thrift Plan                                1,005,229.65                 21.7%
                  Sisters of the Precious Blood                                   229,792.35                  5.0%
                  NI-Gas Savings & Thrift Trust                                   894,805.16                 19.3%
                  Lifepoint Hospitals, Inc.                                       586,478.59                 12.6%

     Class D
                  People's National Bank                                            1,137.92                100.0%

INTERNATIONAL GROWTH PORTFOLIO

     Class A
                  The Northern Trust Co. Pension Plan                           1,361,678.71                 10.3%
                  White Cap, Inc.                                                 889,379.88                  6.7%
                  Tuthill Corp. Supplement Investment                             779,117.86                  5.9%
                  Retirement Plan
                  Indresco                                                        768,860.77                  5.8%
                  Doe Run Resources Corp.                                         873,139.83                  6.6%


</TABLE>



OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.


              Each  Portfolio is  responsible  for the payment of its  expenses.
Such expenses  include,  without  limitation,  the fees and expenses  payable to
Northern,  NTQA  and  PFPC,  brokerage  fees  and  commissions,   fees  for  the
registration  or  qualification  of  Portfolio  shares  under  Federal  or state
securities laws, expenses of the organization of the Portfolio, taxes, interest,
costs of liability insurance,  fidelity bonds,  indemnification or contribution,
any costs,  expenses  or losses  arising out of any  liability  of, or claim for
damages or other relief  asserted  against,  the Trust for violation of any law,
legal, tax and auditing fees and expenses, servicing fees, expenses of preparing
and  printing  prospectuses,   statements  of  additional   information,   proxy
materials,  reports and notices and the printing and distributing of the same to
the Trust's shareholders and regulatory  authorities,  compensation and expenses
of its  Trustees,  expenses for industry  organizations  such as the  Investment
Company Institute, miscellaneous expenses and extraordinary expenses incurred by
the Trust.

              The term "majority of the outstanding  shares" of either the Trust
or a particular  Portfolio means,  with respect to the approval of an investment
advisory  agreement or a change in a fundamental  investment policy, the vote of
the  lesser  of (i) 67% or more of the  shares  of the  Trust or such  Portfolio
present at a meeting,  if the holders of more than 50% of the outstanding shares
of the Trust or such Portfolio are present or represented by proxy, or (ii) more
than 50% of the outstanding shares of the Trust or such Portfolio.

              Statements  contained  in the  Prospectus  or in  this  Additional
Statement as to the contents of any contract or other documents  referred to are
not necessarily complete,  and in each instance reference is made to the copy of
such  contract  or  other  document  filed  as an  exhibit  to the  Registration
Statement of which the  Prospectus  and this  Additional  Statement form a part,
each such statement being qualified in all respects by such reference.

FINANCIAL STATEMENTS

         The audited  financial  statements and related report of _____________,
independent  auditors,  contained  in  the  annual  report  to  the  Portfolios'
shareholders  for the fiscal year ended November 30, 1999 (the "Annual  Report")
are hereby  incorporated herein by reference and attached hereto. No other parts
of the Annual Report, including without limitation,  "Management's Discussion of
Portfolio  Performance,"  are  incorporated by reference  herein.  Copies of the
Semi-Annual  Report  and the Annual  Report may be  obtained  upon  request  and
without charge by calling  1-800-637-1380  (toll-free).  No financial statements
are  supplied  for  the Mid Cap  Growth,  MarketCommand  and  Small  Cap  Growth
Portfolios  because  they did not  commence  operations  during the period ended
November 30, 1999.



<PAGE>


         A- 10
                                                     APPENDIX A

Commercial Paper Ratings

                  A Standard & Poor's Ratings  Group,  Inc.  ("S&P")  commercial
paper rating is a current assessment of the likelihood of timely payment of debt
having an original  maturity of no more than 365 days. The following  summarizes
the rating categories used by Standard and Poor's for commercial paper:

                  "A-1"  -  Obligations  are  rated  in  the  highest   category
indicating that the obligor's  capacity to meet its financial  commitment on the
obligation is strong.  Within this category,  certain obligations are designated
with a plus sign (+). This  indicates  that the  obligor's  capacity to meet its
financial commitment on these obligations is extremely strong.

                  "A-2" -  Obligations  are  somewhat  more  susceptible  to the
adverse  effects  of changes  in  circumstances  and  economic  conditions  than
obligations in higher rating categories. However, the obligor's capacity to meet
its financial commitment on the obligation is satisfactory.

                  "A-3" - Obligations  exhibit adequate  protection  parameters.
However,  adverse economic conditions or changing  circumstances are more likely
to lead to a weakened  capacity of the obligor to meet its financial  commitment
on the obligation.

                  "B"  -   Obligations   are  regarded  as  having   significant
speculative characteristics.  The obligor currently has the capacity to meet its
financial  commitment  on  the  obligation;  however,  it  faces  major  ongoing
uncertainties which could lead to the obligor's  inadequate capacity to meet its
financial commitment on the obligation.

                  "C" - Obligations  are currently  vulnerable to nonpayment and
are dependent upon favorable  business,  financial,  and economic conditions for
the obligor to meet its financial commitment on the obligation.

                  "D" -  Obligations  are in  payment  default.  The "D"  rating
category  is used when  payments on an  obligation  are not made on the date due
even if the  applicable  grace period has not expired,  unless S&P believes that
such payments will be made during such grace period. The "D" rating will be used
upon the filing of a  bankruptcy  petition or the taking of a similar  action if
payments on an obligation are jeopardized.
                  Moody's Investors Service,  Inc. ("Moody's")  commercial paper
ratings are opinions of the ability of issuers to repay  punctually  senior debt
obligations  not  having an  original  maturity  in  excess of one year,  unless
explicitly noted. The following summarizes the rating categories used by Moody's
for commercial paper:

                  "Prime-1"  -  Issuers  (or  supporting  institutions)  have  a
superior ability for repayment of senior  short-term debt  obligations.  Prime-1
repayment   ability  will  often  be   evidenced   by  many  of  the   following
characteristics:  leading market positions in well-established  industries; high
rates of return on funds employed;  conservative  capitalization  structure with
moderate reliance on debt and ample asset protection;  broad margins in earnings
coverage of fixed  financial  charges and high  internal  cash  generation;  and
well-established  access to a range of financial  markets and assured sources of
alternate liquidity.

                  "Prime-2" - Issuers (or supporting institutions) have a strong
ability for repayment of senior short-term debt obligations.  This will normally
be evidenced by many of the characteristics  cited above but to a lesser degree.
Earnings  trends  and  coverage  ratios,  while  sound,  may be more  subject to
variation. Capitalization characteristics,  while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.

                  "Prime-3"  -  Issuers  (or  supporting  institutions)  have an
acceptable  ability for repayment of senior  short-term  debt  obligations.  The
effect  of  industry   characteristics  and  market  compositions  may  be  more
pronounced.  Variability in earnings and  profitability may result in changes in
the  level of debt  protection  measurements  and may  require  relatively  high
financial leverage. Adequate alternate liquidity is maintained.

     "Not  Prime"  -  Issuers  do  not  fall  within  any of  the  Prime  rating
categories.


                  The three rating categories of Duff & Phelps Credit Rating Co.
("D&P") for investment  grade  commercial  paper and short-term  debt are "D-1,"
"D-2" and "D-3." D&P  employs  three  designations,  "D-1+,"  "D-1" and  "D-1-,"
within  the  highest  rating  category.  The  following  summarizes  the  rating
categories used by D&P for commercial paper:

                  "D-1+"  - Debt  possesses  the  highest  certainty  of  timely
payment.  Short-term  liquidity,  including  internal  operating  factors and/or
access to alternative sources of funds, is outstanding, and safety is just below
risk-free U.S. Treasury short-term obligations.

     "D-1" - Debt  possesses very high  certainty of timely  payment.  Liquidity
factors are excellent and supported by good fundamental protection factors. Risk
factors are minor.

     "D-1-" - Debt possesses high certainty of timely payment. Liquidity factors
are strong and supported by good fundamental  protection  factors.  Risk factors
are very small.

                  "D-2" - Debt  possesses  good  certainty  of  timely  payment.
Liquidity factors and company  fundamentals are sound.  Although ongoing funding
needs may enlarge total  financing  requirements,  access to capital  markets is
good. Risk factors are small.

                  "D-3"  -  Debt  possesses  satisfactory  liquidity  and  other
protection  factors  qualify  issues as to  investment  grade.  Risk factors are
larger and subject to more variation. Nevertheless, timely payment is expected.

                  "D-4" - Debt possesses speculative investment characteristics.
Liquidity  is not  sufficient  to insure  against  disruption  in debt  service.
Operating  factors  and  market  access  may  be  subject  to a high  degree  of
variation.

                  "D-5" - Issuer has failed to meet scheduled  principal  and/or
interest payments.

                  Fitch  IBCA  ("Fitch")   short-term   ratings  apply  to  debt
obligations that have time horizons of less than 12 months for most obligations,
or up  to  three  years  for  U.S.  public  finance  securities.  The  following
summarizes the rating categories used by Fitch for short-term obligations:

                  "F1" - Securities  possess the highest  credit  quality.  This
designation  indicates  the strongest  capacity for timely  payment of financial
commitments and may have an added "+" to denote any exceptionally  strong credit
feature.

                  "F2"  -   Securities   possess  good  credit   quality.   This
designation  indicates a  satisfactory  capacity for timely payment of financial
commitments,  but the  margin  of  safety  is not as great as in the case of the
higher ratings.

                  "F3"  -   Securities   possess  fair  credit   quality.   This
designation  indicates  that  the  capacity  for  timely  payment  of  financial
commitments is adequate;  however,  near-term  adverse changes could result in a
reduction to non-investment grade.

                  "B" - Securities  possess  speculative  credit  quality.  This
designation   indicates   minimal  capacity  for  timely  payment  of  financial
commitments,  plus  vulnerability to near-term  adverse changes in financial and
economic conditions.

                  "C" - Securities  possess high default risk. This  designation
indicates that default is a real  possibility  and that the capacity for meeting
financial commitments is solely reliant upon a sustained, favorable business and
economic environment.

                  "D" - Securities are in actual or imminent payment default.


                  Thomson BankWatch,  Inc. ("TBW") short-term ratings assess the
likelihood of an untimely  payment of principal and interest of debt instruments
with original  maturities  of one year or less.  The  following  summarizes  the
ratings used by TBW:

                  "TBW-1" - This  designation  represents TBW's highest category
and indicates a very high likelihood that principal and interest will be paid on
a timely basis.

                  "TBW-2" - This  designation  represents  TBW's  second-highest
category  and  indicates  that  while  the  degree of  safety  regarding  timely
repayment of principal and interest is strong,  the relative degree of safety is
not as high as for issues rated "TBW-1."

                  "TBW-3"   -   This   designation   represents   TBW's   lowest
investment-grade  category  and  indicates  that  while the  obligation  is more
susceptible to adverse developments (both internal and external) than those with
higher  ratings,  the  capacity to service  principal  and  interest in a timely
fashion is considered adequate.

     "TBW-4" - This  designation  represents  TBW's lowest  rating  category and
indicates that the obligation is regarded as non-investment  grade and therefore
speculative.


Corporate and Municipal Long-Term Debt Ratings

                  The following summarizes the ratings used by S&P for corporate
and municipal debt:

     "AAA" - An  obligation  rated  "AAA" has the  highest  rating  assigned  by
Standard & Poor's.  The obligor's  capacity to meet its financial  commitment on
the obligation is extremely strong.

     "AA" - An obligation rated "AA" differs from the highest rated  obligations
only in small degree. The obligor's capacity to meet its financial commitment on
the obligation is very strong.

                  "A" - An obligation  rated "A" is somewhat more susceptible to
the adverse  effects of changes in  circumstances  and economic  conditions than
obligations in higher-rated categories.  However, the obligor's capacity to meet
its financial commitment on the obligation is still strong.

                  "BBB" - An obligation rated "BBB" exhibits adequate protection
parameters.  However,  adverse economic conditions or changing circumstances are
more likely to lead to a weakened  capacity of the obligor to meet its financial
commitment on the obligation.

                  Obligations  rated "BB," "B," "CCC," "CC" and "C" are regarded
as having  significant  speculative  characteristics.  "BB"  indicates the least
degree of speculation and "C" the highest.  While such  obligations  will likely
have some quality and  protective  characteristics,  these may be  outweighed by
large uncertainties or major exposures to adverse conditions.

                  "BB"  -  An  obligation  rated  "BB"  is  less  vulnerable  to
nonpayment  than other  speculative  issues.  However,  it faces  major  ongoing
uncertainties or exposure to adverse business,  financial or economic conditions
which could lead to the  obligor's  inadequate  capacity  to meet its  financial
commitment on the obligation.

                  "B" - An obligation rated "B" is more vulnerable to nonpayment
than obligations  rated "BB," but the obligor currently has the capacity to meet
its  financial  commitment on the  obligation.  Adverse  business,  financial or
economic  conditions will likely impair the obligor's capacity or willingness to
meet its financial commitment on the obligation.

                  "CCC" - An obligation  rated "CCC" is currently  vulnerable to
nonpayment,  and is dependent  upon favorable  business,  financial and economic
conditions for the obligor to meet its financial  commitment on the  obligation.
In the event of adverse business, financial, or economic conditions, the obligor
is not  likely to have the  capacity  to meet its  financial  commitment  on the
obligation.

                  "CC" - An obligation rated "CC" is currently highly vulnerable
to nonpayment.

                  "C" - The "C" rating may be used to cover a situation  where a
bankruptcy  petition  has been  filed or  similar  action  has been  taken,  but
payments on this obligation are being continued.

                  "D" - An obligation rated "D" is in payment  default.  The "D"
rating  category is used when payments on an obligation are not made on the date
due even if the  applicable  grace period has not  expired,  unless S&P believes
that such payments  will be made during such grace  period.  The "D" rating also
will be used upon the filing of a bankruptcy petition or the taking of a similar
action if payments on an obligation are jeopardized.

                  PLUS (+) OR MINUS (-) - The ratings  from "AA"  through  "CCC"
may be  modified  by the  addition  of a plus or  minus  sign  to show  relative
standing within the major rating categories.

                  "r" - This symbol is  attached  to the ratings of  instruments
with significant noncredit risks. It highlights risks to principal or volatility
of expected  returns  which are not  addressed  in the credit  rating.  Examples
include: obligations linked or indexed to equities,  currencies, or commodities;
obligations  exposed  to  severe  prepayment  risk - such  as  interest-only  or
principal-only  mortgage  securities;   and  obligations  with  unusually  risky
interest terms, such as inverse floaters.

         The following  summarizes the ratings used by Moody's for corporate and
municipal long-term debt:

                  "Aaa" - Bonds are judged to be of the best quality. They carry
the smallest  degree of investment  risk and are generally  referred to as "gilt
edged." Interest payments are protected by a large or by an exceptionally stable
margin and principal is secure. While the various protective elements are likely
to change,  such changes as can be  visualized  are most  unlikely to impair the
fundamentally strong position of such issues.

                  "Aa"  -  Bonds  are  judged  to  be of  high  quality  by  all
standards.  Together with the "Aaa" group they comprise what are generally known
as high-grade bonds. They are rated lower than the best bonds because margins of
protection  may  not be as  large  as in  "Aaa"  securities  or  fluctuation  of
protective  elements may be of greater  amplitude or there may be other elements
present  which make the  long-term  risk appear  somewhat  larger than the "Aaa"
securities.

                  "A" - Bonds possess many favorable  investment  attributes and
are to be considered as upper-medium-grade obligations.  Factors giving security
to principal and interest are considered  adequate,  but elements may be present
which suggest a susceptibility to impairment sometime in the future.

                  "Baa" - Bonds  are  considered  as  medium-grade  obligations,
(i.e., they are neither highly protected nor poorly secured).  Interest payments
and principal  security appear  adequate for the present but certain  protective
elements may be lacking or may be  characteristically  unreliable over any great
length of time. Such bonds lack outstanding  investment  characteristics  and in
fact have speculative characteristics as well.

                  "Ba," "B,"  "Caa,"  "Ca," and "C" - Bonds that  possess one of
these ratings  provide  questionable  protection of interest and principal ("Ba"
indicates speculative elements;  "B" indicates a general lack of characteristics
of desirable investment; "Caa" are of poor standing; "Ca" represents obligations
which are  speculative  in a high degree;  and "C"  represents  the lowest rated
class of bonds). "Caa," "Ca" and "C" bonds may be in default.

                  Con.  (---) - Bonds for which the  security  depends  upon the
completion  of  some  act  or  the  fulfillment  of  some  condition  are  rated
conditionally.  These  are bonds  secured  by (a)  earnings  of  projects  under
construction,  (b) earnings of projects unseasoned in operating experience,  (c)
rentals which begin when facilities are completed, or (d) payments to which some
other limiting condition attaches.  Parenthetical rating denotes probable credit
stature upon completion of construction or elimination of basis of condition.

     Note:  Moody's  applies  numerical  modifiers  1, 2, and 3 in each  generic
rating classification from "Aa" through "Caa." The modifier 1 indicates that the
obligation ranks in the higher end of its generic rating category;  the modifier
2 indicates a mid-range  ranking;  and the modifier 3 indicates a ranking in the
lower end of its generic rating category.

                  The following  summarizes  the long-term  debt ratings used by
D&P for corporate and municipal long-term debt:

     "AAA" - Debt is considered to be of the highest  credit  quality.  The risk
factors  are  negligible,  being  only  slightly  more than for  risk-free  U.S.
Treasury debt.

     "AA" - Debt is considered to be of high credit quality.  Protection factors
are strong.  Risk is modest but may vary  slightly  from time to time because of
economic conditions.

                  "A" - Debt possesses  protection factors which are average but
adequate. However, risk factors are more variable in periods of greater economic
stress.

                  "BBB" - Debt possesses  below-average  protection  factors but
such protection factors are still considered  sufficient for prudent investment.
Considerable variability in risk is present during economic cycles.

                  "BB," "B," "CCC," "DD" and "DP" - Debt that  possesses  one of
these  ratings  is  considered  to be below  investment  grade.  Although  below
investment grade, debt rated "BB" is deemed likely to meet obligations when due.
Debt rated "B"  possesses  the risk that  obligations  will not be met when due.
Debt rated "CCC" is well below investment grade and has considerable uncertainty
as to timely payment of principal,  interest or preferred dividends.  Debt rated
"DD" is a defaulted debt  obligation,  and the rating "DP" represents  preferred
stock with dividend arrearages.

                  To provide more detailed  indications of credit  quality,  the
"AA," "A," "BBB," "BB" and "B" ratings may be modified by the addition of a plus
(+) or minus (-) sign to show relative standing within these major categories.

                  The  following  summarizes  the  ratings  used  by  Fitch  for
corporate and municipal bonds:

                  "AAA" - Bonds  considered  to be  investment  grade and of the
highest credit  quality.  These ratings denote the lowest  expectation of credit
risk and are assigned only in case of  exceptionally  strong capacity for timely
payment  of  financial  commitments.  This  capacity  is highly  unlikely  to be
adversely affected by foreseeable events.

                  "AA" - Bonds  considered  to be  investment  grade and of very
high credit quality.  These ratings denote a very low expectation of credit risk
and indicate very strong  capacity for timely payment of financial  commitments.
This capacity is not significantly vulnerable to foreseeable events.

                  "A" - Bonds  considered  to be  investment  grade  and of high
credit  quality.  These  ratings  denote a low  expectation  of credit  risk and
indicate  strong  capacity  for timely  payment of financial  commitments.  This
capacity may, nevertheless, be more vulnerable to changes in circumstances or in
economic conditions than is the case for higher ratings.

                  "BBB" - Bonds  considered to be  investment  grade and of good
credit  quality.  These ratings denote that there is currently a low expectation
of credit  risk.  The capacity for timely  payment of financial  commitments  is
considered  adequate,  but  adverse  changes in  circumstances  and in  economic
conditions are more likely to impair this capacity.

                  "BB" -  Bonds  considered  to be  speculative.  These  ratings
indicate that there is a possibility of credit risk developing,  particularly as
the result of adverse economic changes over time; however, business or financial
alternatives  may  be  available  to  allow  financial  commitments  to be  met.
Securities rated in this category are not investment grade.

                  "B" - Bonds are considered highly  speculative.  These ratings
indicate that significant credit risk is present, but a limited margin of safety
remains.  Financial  commitments are currently being met; however,  capacity for
continued  payment  is  contingent  upon a  sustained,  favorable  business  and
economic environment.

                  "CCC," "CC" and "C" - Bonds have high default risk. Default is
a real  possibility,  and capacity for meeting  financial  commitments is solely
reliant  upon  sustained,  favorable  business  or economic  developments.  "CC"
ratings  indicate  that default of some kind appears  probable,  and "C" ratings
signal imminent default.

                  "DDD," "DD" and "D" - Bonds are in default. Securities are not
meeting obligations and are extremely speculative.  "DDD" designates the highest
potential for recovery of amounts outstanding on any securities involved and "D"
represents the lowest potential for recovery.

                  To provide more detailed  indications of credit  quality,  the
Fitch  IBCA  ratings  from  and  including  "AA" to "B" may be  modified  by the
addition of a plus (+) or minus (-) sign to show relative  standing within these
major rating categories.

                  Thomson  BankWatch  assesses  the  likelihood  of an  untimely
repayment of  principal or interest  over the term to maturity of long term debt
and preferred stock which are issued by United States commercial banks,  thrifts
and non-bank banks;  non-United States banks; and broker-dealers.  The following
summarizes the rating  categories  used by Thomson  BankWatch for long-term debt
ratings:

                  "AAA" - This  designation  indicates that the ability to repay
principal and interest on a timely basis is extremely high.

                  "AA" - This  designation  indicates a very  strong  ability to
repay principal and interest on a timely basis,  with limited  incremental  risk
compared to issues rated in the highest category.

                  "A" - This  designation  indicates  that the  ability to repay
principal and interest is strong.  Issues rated "A" could be more  vulnerable to
adverse  developments  (both internal and external) than obligations with higher
ratings.

                  "BBB"   -   This    designation    represents    the    lowest
investment-grade   category  and  indicates  an  acceptable  capacity  to  repay
principal  and  interest.  Issues  rated  "BBB" are more  vulnerable  to adverse
developments (both internal and external) than obligations with higher ratings.

                  "BB," "B," "CCC" and "CC" - These designations are assigned by
Thomson  BankWatch  to  non-investment  grade  long-term  debt.  Such issues are
regarded as having  speculative  characteristics  regarding  the  likelihood  of
timely  payment of principal and interest.  "BB"  indicates the lowest degree of
speculation and "CC" the highest degree of speculation.

     "D" - This designation indicates that the long-term debt is in default.

                  PLUS (+) OR MINUS (-) - The ratings  from "AAA"  through  "CC"
may include a plus or minus sign  designation  which  indicates where within the
respective category the issue is placed.


Municipal Note Ratings

     A S&P's rating  reflects  the  liquidity  concerns and market  access risks
unique to notes due in three years or less. The following summarizes the ratings
used by S&P for municipal notes:

                  "SP-1" - The issuers of these municipal notes exhibit a strong
capacity to pay principal and interest.  Those issues determined to possess very
strong characteristics are given a plus (+) designation.

                  "SP-2"  -  The  issuers  of  these   municipal  notes  exhibit
satisfactory capacity to pay principal and interest,  with some vulnerability to
adverse financial and economic changes over the term of the notes.

                  "SP-3"  -  The  issuers  of  these   municipal  notes  exhibit
speculative capacity to pay principal and interest.


                  Moody's  ratings  for  state  and  municipal  notes  and other
short-term  loans are designated  Moody's  Investment Grade ("MIG") and variable
rate  demand  obligations  are  designated  Variable  Moody's  Investment  Grade
("VMIG").  Such ratings recognize the differences between short-term credit risk
and  long-term  risk.  The  following  summarizes  the  ratings by  Moody's  for
short-term notes:

                  "MIG-1"/"VMIG-1"  - This  designation  denotes  best  quality.
There is present strong protection by established cash flows, superior liquidity
support or demonstrated broad-based access to the market for refinancing.

                  "MIG-2"/"VMIG-2" - This designation denotes high quality, with
margins of protection  that are ample  although not so large as in the preceding
group.

                  "MIG-3"/"VMIG-3" - This designation denotes favorable quality,
with all security elements accounted for but lacking the undeniable  strength of
the  preceding  grades.  Liquidity  and cash flow  protection  may be narrow and
market access for refinancing is likely to be less well established.

                  "MIG-4"/"VMIG-4" - This designation  denotes adequate quality.
Protection  commonly  regarded as required of an investment  security is present
and although not  distinctly  or  predominantly  speculative,  there is specific
risk.

                  "SG" - This  designation  denotes  speculative  quality.  Debt
instruments in this category lack of margins of protection.

                  Fitch  and D&P  use the  short-term  ratings  described  under
Commercial Paper Ratings for municipal notes.



<PAGE>


                                                   B-65

APPENDIX B


                  As stated in the  Prospectus,  the  Portfolios  may enter into
certain futures transactions. Such transactions are described in this Appendix.


I.       Interest Rate Futures Contracts

                  Use of  Interest  Rate  Futures  Contracts.  Bond  prices  are
established in both the cash market and the futures market.  In the cash market,
bonds are  purchased  and sold with payment for the full  purchase  price of the
bond being made in cash, generally within five business days after the trade. In
the  futures  market,  only a contract is made to purchase or sell a bond in the
future  for a set price on a certain  date.  Historically,  the prices for bonds
established  in the  futures  markets  have  tended  to  move  generally  in the
aggregate  in concert  with the cash market  prices and have  maintained  fairly
predictable  relationships.  Accordingly,  a  Portfolio  may use  interest  rate
futures  contracts as a defense,  or hedge,  against  anticipated  interest rate
changes.  As described  below,  this would  include the use of futures  contract
sales to protect  against  expected  increases  in  interest  rates and  futures
contract purchases to offset the impact of interest rate declines.

                  A Portfolio  presently  could  accomplish a similar  result to
that which it hopes to achieve  through the use of futures  contracts by selling
bonds with long  maturities  and investing in bonds with short  maturities  when
interest rates are expected to increase, or conversely, selling short-term bonds
and investing in long-term  bonds when  interest  rates are expected to decline.
However, because of the liquidity that is often available in the futures market,
the  protection  is more  likely to be  achieved,  perhaps  at a lower  cost and
without  changing the rate of interest  being  earned by a  Portfolio,  by using
futures contracts.

                  Interest rate future contracts can also be used by a Portfolio
for non-hedging (speculative) purposes to increase total return.

                  Description  of Interest Rate Futures  Contracts.  An interest
rate futures contract sale would create an obligation by a Portfolio, as seller,
to deliver the specific type of financial  instrument called for in the contract
at a specific  future time for a specified  price. A futures  contract  purchase
would create an obligation by a Portfolio, as purchaser, to take delivery of the
specific type of financial  instrument  at a specific  future time at a specific
price. The specific securities delivered or taken,  respectively,  at settlement
date,  would not be  determined  until at or near that date.  The  determination
would be in  accordance  with the rules of the  exchange  on which  the  futures
contract sale or purchase was made.

                  Although  interest rate futures  contracts by their terms call
for actual delivery or acceptance of securities, in most cases the contracts are
closed out before the  settlement  date without the making or taking of delivery
of  securities.  Closing  out  a  futures  contract  sale  is  effected  by  the
Portfolio's  entering into a futures  contract  purchase for the same  aggregate
amount of the specific type of financial  instrument and the same delivery date.
If the price of the sale  exceeds  the  price of the  offsetting  purchase,  the
Portfolio is  immediately  paid the  difference and thus realizes a gain. If the
offsetting  purchase  price  exceeds  the sale  price,  the  Portfolio  pays the
difference and realizes a loss. Similarly, the closing out of a futures contract
purchase is effected by the Portfolio  entering into a futures contract sale. If
the offsetting sale price exceeds the purchase price,  the Portfolio  realizes a
gain, and if the purchase price exceeds the offsetting sale price, the Portfolio
realizes a loss.

                  Interest  rate  futures  contracts  are  traded in an  auction
environment on the floors of several exchanges -- principally, the Chicago Board
of Trade,  the Chicago  Mercantile  Exchange and the New York Futures  Exchange.
Each  exchange  guarantees  performance  under  contract  provisions  through  a
clearing  corporation,   a  nonprofit   organization  managed  by  the  exchange
membership.

                  A public  market  now  exists in  futures  contracts  covering
various financial instruments including long-term U.S. Treasury Bonds and Notes;
Government National Mortgage Association (GNMA) modified  pass-through  mortgage
backed  securities;  three-month U.S. Treasury Bills; and ninety-day  commercial
paper. The Portfolios may trade in any interest rate futures contracts for which
there exists a public  market,  including,  without  limitation,  the  foregoing
instruments.

I.       Index Futures Contracts


                  General.  A stock or bond index assigns relative values to the
stocks or bonds  included in the index,  which  fluctuates  with  changes in the
market  values  of the  stocks  or bonds  included.  Some  stock  index  futures
contracts are based on broad market indexes,  such as S&P's 500 Index or the New
York Stock  Exchange  Composite  Index.  In contrast,  certain  exchanges  offer
futures  contracts on narrower  market  indexes,  such as the S&P's 100 Index or
indexes  based on an  industry  or  market  indexes,  such as S&P's 100 Index or
indexes  based on an  industry  or market  segment,  such as oil and gas stocks.
Futures contracts are traded on organized  exchanges  regulated by the Commodity
Futures Trading Commission. Transactions on such exchanges are cleared through a
clearing  corporation,  which  guarantees the performance of the parties to each
contract.  To the extent consistent with its investment  objective,  a Portfolio
may also  engage in  transactions,  from time to time,  in foreign  stock  index
futures such as the ALL-ORDS (Australia), CAC-40 (France), TOPIX (Japan) and the
FTSE-100 (United Kingdom).

                  A  Portfolio  may sell  index  futures  contracts  in order to
offset a  decrease  in  market  value of its  portfolio  securities  that  might
otherwise  result from a market  decline.  A Portfolio may do so either to hedge
the value of its portfolio as a whole, or to protect against declines, occurring
prior  to sales  of  securities,  in the  value  of the  securities  to be sold.
Conversely, a Portfolio will purchase index futures contracts in anticipation of
purchases of  securities.  A long futures  position may be terminated  without a
corresponding purchase of securities.

                  In addition,  a Portfolio may utilize index futures  contracts
in  anticipation of changes in the  composition of its portfolio  holdings.  For
example,  in the event that a Portfolio  expects to narrow the range of industry
groups  represented  in its  holdings it may,  prior to making  purchases of the
actual securities,  establish a long futures position based on a more restricted
index, such as an index comprised of securities of a particular  industry group.
A Portfolio may also sell futures contracts in connection with this strategy, in
order to protect against the possibility  that the value of the securities to be
sold as part of the  restructuring  of the  portfolio  will decline prior to the
time of sale.

                  Index  futures  contracts  may also be used by a Portfolio for
non-hedging (speculative) purposes to increase total return.

I.       Futures Contracts on Foreign Currencies

                  A  futures  contract  on  foreign  currency  creates a binding
obligation on one party to deliver,  and a  corresponding  obligation on another
party to accept  delivery  of, a stated  quantity  of foreign  currency,  for an
amount  fixed  in  U.S.  dollars.  Foreign  currency  futures  may be  used by a
Portfolio to hedge against  exposure to  fluctuations  in exchange rates between
the U.S. dollar and other currencies arising from multinational transactions.

I.       Margin Payments

                  Unlike purchases or sales of portfolio securities, no price is
paid or received by a Portfolio upon the purchase or sale of a futures contract.
Initially,  a  Portfolio  will be  required  to deposit  with the broker or in a
segregated account with a custodian or sub-custodian an amount of liquid assets,
known as  initial  margin,  based on the value of the  contract.  The  nature of
initial  margin in  futures  transactions  is  different  from that of margin in
security  transactions  in that  futures  contract  margin  does not involve the
borrowing  of funds by the  customer to finance the  transactions.  Rather,  the
initial  margin is in the nature of a performance  bond or good faith deposit on
the contract which is returned to the Portfolio upon  termination of the futures
contract  assuming all contractual  obligations have been satisfied.  Subsequent
payments,  called variation  margin,  to and from the broker,  will be made on a
daily basis as the price of the  underlying  instruments  fluctuates  making the
long and short  positions  in the  futures  contract  more or less  valuable,  a
process known as  "marking-to-market."  For example, when a particular Portfolio
has  purchased a futures  contract  and the price of the  contract  has risen in
response  to a rise in the  underlying  instruments,  that  position  will  have
increased in value and the Portfolio will be entitled to receive from the broker
a variation  margin payment equal to that increase in value.  Conversely,  where
the  Portfolio  has  purchased  a futures  contract  and the price of the future
contract has declined in response to a decrease in the  underlying  instruments,
the position would be less valuable and the Portfolio  would be required to make
a variation  margin  payment to the broker.  Prior to  expiration of the futures
contract,  Northern  Trust or NTQA may elect to close the  position by taking an
opposite position, subject to the availability of a secondary market, which will
operate to terminate the Portfolio's  position in the futures contract.  A final
determination of variation  margin is then made,  additional cash is required to
be paid by or released to the  Portfolio,  and the Portfolio  realizes a loss or
gain.

I.       Risks of Transactions in Futures Contracts

                  There are several risks in connection  with the use of futures
by a Portfolio.  One risk arises  because of the imperfect  correlation  between
movements  in the  price  of the  futures  and  movements  in the  price  of the
instruments which are the subject of the hedge. The price of the future may move
more than or less than the price of the instruments  being hedged.  If the price
of the  futures  moves  less  than the  price of the  instruments  which are the
subject of the hedge, the hedge will not be fully effective but, if the price of
the  instruments  being  hedged  has  moved  in an  unfavorable  direction,  the
Portfolio would be in a better position than if it had not hedged at all. If the
price of the instruments being hedged has moved in a favorable  direction,  this
advantage will be partially  offset by the loss on the futures.  If the price of
the futures moves more than the price of the hedged  instruments,  the Portfolio
involved will experience  either a loss or gain on the futures which will not be
completely  offset by  movements in the price of the  instruments  which are the
subject of the hedge.  To compensate for the imperfect  correlation of movements
in the price of  instruments  being hedged and movements in the price of futures
contracts,  a Portfolio  may buy or sell futures  contracts in a greater  dollar
amount than the dollar amount of instruments being hedged if the volatility over
a particular time period of the prices of such instruments has been greater than
the volatility over such time period of the futures,  or if otherwise  deemed to
be appropriate by the Investment  Advisers.  Conversely,  a Portfolio may buy or
sell fewer futures  contracts if the volatility over a particular time period of
the prices of the instruments being hedged is less than the volatility over such
time period of the futures  contract  being used,  or if otherwise  deemed to be
appropriate  by the  Investment  Advisers.  It is also  possible  that,  where a
Portfolio  has sold  futures  to hedge its  portfolio  against a decline  in the
market,  the  market  may  advance  and the  value  of  instruments  held in the
Portfolio may decline.  If this occurred,  the Portfolio would lose money on the
futures and also experience a decline in value in its portfolio securities.

                  When  futures  are  purchased  to  hedge  against  a  possible
increase in the price of securities or a currency  before a Portfolio is able to
invest its cash (or cash equivalents) in an orderly fashion, it is possible that
the market may decline  instead;  if the Portfolio  then concludes not to invest
its cash at that time because of concern as to possible  further  market decline
or for other reasons,  the Portfolio will realize a loss on the futures contract
that is not offset by a reduction in the price of the  instruments  that were to
be purchased.

                  In addition to the possibility  that there may be an imperfect
correlation,  or no correlation at all, between movements in the futures and the
instruments being hedged, the price of futures may not correlate  perfectly with
movement  in the cash  market due to certain  market  distortions.  Rather  than
meeting  additional  margin  deposit  requirements,  investors may close futures
contracts  through  off-setting  transactions  which  could  distort  the normal
relationship  between  the cash and futures  markets.  Second,  with  respect to
financial  futures  contracts,  the liquidity of the futures  market  depends on
participants entering into off-setting transactions rather than making or taking
delivery. To the extent participants decide to make or take delivery,  liquidity
in the futures market could be reduced thus producing  distortions.  Third, from
the point of view of speculators, the deposit requirements in the futures market
are less onerous than margin  requirements in the securities market.  Therefore,
increased  participation  by  speculators  in the futures  market may also cause
temporary price  distortions.  Due to the possibility of price distortion in the
futures market, and because of the imperfect  correlation  between the movements
in the cash market and movements in the price of futures,  a correct forecast of
general market trends or interest rate  movements by the Investment  Adviser may
still not result in a successful hedging transaction over a short time frame.

                  Positions  in futures may be closed out only on an exchange or
board of trade which provides a secondary market for such futures.  Although the
Portfolios  intend to purchase or sell  futures  only on  exchanges or boards of
trade where there appear to be active secondary  markets,  there is no assurance
that a liquid  secondary market on any exchange or board of trade will exist for
any particular  contract or at any particular time. In such event, it may not be
possible  to close a futures  investment  position,  and in the event of adverse
price  movements,  a Portfolio  would continue to be required to make daily cash
payments of variation margin.  However, in the event futures contracts have been
used to hedge portfolio  securities,  such securities will not be sold until the
futures contract can be terminated.  In such  circumstances,  an increase in the
price of the  securities,  if any, may partially or completely  offset losses on
the futures contract.  However,  as described above,  there is no guarantee that
the price of the securities  will in fact correlate with the price  movements in
the futures contract and thus provide an offset on a futures contract.

                  Further,  it should be noted that the liquidity of a secondary
market  in a  futures  contract  may  be  adversely  affected  by  "daily  price
fluctuation limits" established by commodity exchanges which limit the amount of
fluctuation  in a futures  contract  price during a single trading day. Once the
daily limit has been reached in the contract, no trades may be entered into at a
price  beyond  the  limit,  thus  preventing  the  liquidation  of open  futures
positions.  The  trading of  futures  contracts  is also  subject to the risk of
trading  halts,  suspensions,  exchange or clearing  house  equipment  failures,
government  intervention,  insolvency of a brokerage  firm or clearing  house or
other  disruptions  of normal  trading  activity,  which  could at times make it
difficult or impossible  to liquidate  existing  positions or to recover  excess
variation margin payments.

                  Successful  use of futures by a Portfolio  is also  subject to
the Investment Advisers' ability to predict correctly movements in the direction
of the market.  For example,  if a particular  Portfolio has hedged  against the
possibility of a decline in the market adversely affecting securities held by it
and securities prices increase  instead,  the Portfolio will lose part or all of
the benefit to the increased value of its securities which it has hedged because
it will have offsetting losses in its futures  positions.  In addition,  in such
situations,  if the  Portfolio  has  insufficient  cash,  it may  have  to  sell
securities to meet daily variation margin requirements. Such sales of securities
may be, but will not  necessarily  be, at  increased  prices  which  reflect the
rising market.  A Portfolio may have to sell securities at a time when it may be
disadvantageous to do so.

I.       Options on Futures Contracts

                  A  Portfolio  may  purchase  and write  options on the futures
contracts  described above. A futures option gives the holder, in return for the
premium  paid,  the right to buy (call)  from or sell (put) to the writer of the
option a futures  contract at a specified price at any time during the period of
the option.  Upon  exercise,  the writer of the option is  obligated  to pay the
difference  between  the cash value of the  futures  contract  and the  exercise
price. Like the buyer or seller of a futures contract, the holder, or writer, of
an  option  has the  right to  terminate  its  position  prior to the  scheduled
expiration of the option by selling, or purchasing an option of the same series,
at which time the person  entering into the closing  transaction  will realize a
gain or loss.  A  Portfolio  will be  required  to  deposit  initial  margin and
variation  margin  with  respect to put and call  options  on futures  contracts
written by it  pursuant  to  brokers'  requirements  similar to those  described
above. Net option premiums received will be included as initial margin deposits.
As an example,  in  anticipation of a decline in interest rates, a Portfolio may
purchase call options on futures  contracts as a substitute  for the purchase of
futures  contracts  to  hedge  against  a  possible  increase  in the  price  of
securities which the Portfolio intends to purchase.  Similarly,  if the value of
the  securities  held by a  Portfolio  is  expected to decline as a result of an
increase in interest  rates,  the Portfolio  might  purchase put options or sell
call options on futures contracts rather than sell futures contracts.

                  Investments  in  futures  options  involve  some  of the  same
considerations  that are  involved in  connection  with  investments  in futures
contracts  (for  example,  the  existence  of a  liquid  secondary  market).  In
addition,  the  purchase or sale of an option also entails the risk that changes
in the value of the underlying  futures  contract will not correspond to changes
in the value of the option  purchased.  Depending  on the  pricing of the option
compared  to either the  futures  contract  upon which it is based,  or upon the
price of the  securities  being  hedged,  an option may or may not be less risky
than  ownership  of the futures  contract or such  securities.  In general,  the
market  prices of options can be expected  to be more  volatile  than the market
prices on the underlying  futures contract.  Compared to the purchase or sale of
futures  contracts,  however,  the  purchase  of call or put  options on futures
contracts may frequently  involve less  potential risk to the Portfolio  because
the maximum amount at risk is the premium paid for the options (plus transaction
costs). The writing of an option on a futures contract involves risks similar to
those risks relating to the sale of futures contracts.

I.       Other Matters

                  Accounting for futures  contracts  will be in accordance  with
generally accepted accounting principles.




<PAGE>


PART B

STATEMENT OF ADDITIONAL INFORMATION

NORTHERN INSTITUTIONAL FUNDS

U.S. GOVERNMENT SECURITIES PORTFOLIO
SHORT-INTERMEDIATE BOND PORTFOLIO
INTERMEDIATE BOND PORTFOLIO
U.S. TREASURY INDEX PORTFOLIO
BOND PORTFOLIO
INTERNATIONAL BOND PORTFOLIO


         This  Statement  of  Additional  Information  dated  April 1, 2000 (the
"Additional  Statement")  is not a prospectus.  Copies of the  prospectus  dated
April 1, 2000 for the U.S. Government Securities,  Short-Intermediate Bond, U.S.
Treasury Index,  Bond,  Intermediate Bond and International Bond Portfolios (the
"Portfolios") of Northern Institutional Funds (the "Prospectus") may be obtained
without  charge by calling  1-800-637-1380  (toll-free).  Capitalized  terms not
otherwise defined have the same meaning as in the Prospectus.

         The   audited    financial    statements    and   related   report   of
_________________,  independent auditors,  contained in the annual report to the
Portfolios'  shareholders  for the  fiscal  year  ended  November  30,  1999 are
incorporated herein by reference in the section entitled "Financial Statements."
No other parts of the annual report are incorporated herein by reference. Copies
of the annual report may be obtained upon request and without  charge by calling
1-800-637-1380 (toll-free).



<PAGE>


INDEX
                                                                         Page

ADDITIONAL INVESTMENT INFORMATION........................................B-3
         CLASSIFICATION AND HISTORY......................................B-3
         INVESTMENT OBJECTIVES, STRATEGIES AND RISKS.....................B-3
         INVESTMENT RESTRICTIONS.........................................B-17
ADDITIONAL TRUST INFORMATION.............................................B-20
         TRUSTEES AND OFFICERS...........................................B-20
         INVESTMENT ADVISERS, TRANSFER AGENT AND CUSTODIAN...............B-25
         PORTFOLIO TRANSACTIONS..........................................B-31
         PORTFOLIO VALUATION............................................ B-32
         CO-ADMINISTRATORS AND DISTRIBUTOR...............................B-32
         SHAREHOLDER SERVICING PLAN......................................B-35
         COUNSEL AND AUDITORS............................................B-37
         IN-KIND PURCHASES AND REDEMPTIONS...............................B-37
PERFORMANCE INFORMATION..................................................B-38
TAXES    B-47
         GENERAL  B-47
         FOREIGN INVESTORS......................................... .....B-48
         CONCLUSION......................................................B-49
DESCRIPTION OF SHARES....................................................B-49
OTHER INFORMATION........................................................B-54
FINANCIAL STATEMENTS.....................................................B-55
APPENDIX A...............................................................1-A
APPENDIX B...............................................................1-B



No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection  with the offering made by the  Prospectus  and, if given or made,
such  information  or  representations  must not be relied  upon as having  been
authorized by the Trust or its  distributor.  The Prospectus does not constitute
an offering by the Trust or by the distributor in any jurisdiction in which such
offering may not lawfully be made.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  An  investment  in a Portfolio  involves  investment  risks,  including
possible loss of principal.


<PAGE>



ADDITIONAL INVESTMENT INFORMATION

Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment company. Each Portfolio (other than the International Bond Portfolio)
is  classified  as  diversified  under the  Investment  Company Act of 1940,  as
amended (the "1940 Act").  The  International  Bond  Portfolio is  classified as
non-diversified under the 1940 Act.


         Each Portfolio is a series of the Trust, which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").   The  Trust  is  the  result  of  a  reorganization  of  a
Massachusetts  business trust formerly known as The Benchmark Funds on March 31,
1998.  The Trust's  name was changed  from The  Benchmark  Funds to the Northern
Institutional  Funds on July 15, 1998.  The Trust also offers five money market,
one  balanced,  and nine  equity  portfolios,  which are not  described  in this
document.

Investment Objectives, Strategies and Risks

         The following  supplements  the investment  objectives,  strategies and
risks of the Portfolios as set forth in the Prospectus. The investment objective
of the Intermediate Bond Portfolio may be changed without shareholder  approval.
The investment  objective of each other Portfolio may not be changed without the
vote of the majority of the Portfolio's  outstanding shares. Except as expressly
noted  below,  however,  each  Portfolio's  investment  policies  may be changed
without shareholder approval.

     U.S.  Government  Obligations.  Examples  of the  types of U.S.  Government
obligations that may be acquired by the Portfolios  include U.S. Treasury Bills,
Treasury  Notes and  Treasury  Bonds and the  obligations  of Federal  Home Loan
Banks,  Federal  Farm Credit  Banks,  Federal  Land Banks,  the Federal  Housing
Administration,  Farmers Home  Administration,  Export-Import Bank of the United
States,  Small Business  Administration,  Federal National Mortgage  Association
("FNMA"),  Government National Mortgage Association  ("GNMA"),  General Services
Administration,  Central  Bank for  Cooperatives,  Federal  Home  Loan  Mortgage
Corporation  ("FHLMC"),  Federal  Intermediate  Credit  Banks,  and the Maritime
Administration.

         Securities  guaranteed  as  to  principal  and  interest  by  the  U.S.
Government,  its  agencies or  instrumentalities  are also deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of credit  issued by the U.S.  Government  or any  agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         To the extent consistent with its investment objectives, the Portfolios
may invest in a variety of US. Treasury obligations and obligations issued by or
guaranteed by the U.S. Government or its agencies and instrumentalities. Not all
U.S.  Government  obligations carry the same credit support. No assurance can be
given that the U.S.  Government would provide  financial support to its agencies
or  instrumentalities  if it is  not  obligated  to do so by  law.  There  is no
assurance  that these  commitments  will be  undertaken  or complied with in the
future.  In addition,  the secondary market for certain  participations in loans
made to foreign governments or their agencies may be limited.

         Supranational  Bank  Obligations.  Each Portfolio  (other than the U.S.
Treasury Index  Portfolio) may invest in  obligations  of  supranational  banks.
Supranational banks are international banking institutions designed or supported
by national governments to promote economic reconstruction, development or trade
between nations (e.g., the World Bank).  Obligations of supranational  banks may
be supported by appropriated  but unpaid  commitments of their member  countries
and there is no assurance  that these  commitments  will be undertaken or met in
the future.

         Stripped  Securities.  Each Portfolio may purchase stripped securities.
The Treasury  Department has  facilitated  transfers of ownership of zero coupon
securities by accounting  separately for the beneficial  ownership of particular
interest  coupon and  principal  payments  on  Treasury  securities  through the
Federal Reserve book-entry record-keeping system. The Federal Reserve program as
established by the Treasury Department is known as "STRIPS" or "Separate Trading
of Registered Interest and Principal of Securities." Each Portfolio may purchase
securities  registered  in the  STRIPS  program.  Under the  STRIPS  program,  a
Portfolio  will be  able  to  have  its  beneficial  ownership  of  zero  coupon
securities recorded directly in the book-entry  record-keeping system in lieu of
having to hold  certificates  or other  evidences of ownership of the underlying
U.S. Treasury securities.

         In  addition,  each  Portfolio  (other  than  the U.S.  Treasury  Index
Portfolio) may acquire U.S. Government  obligations and their unmatured interest
coupons  that have been  separated  ("stripped")  by their  holder,  typically a
custodian  bank or  investment  brokerage  firm.  Having  separated the interest
coupons from the underlying  principal of the U.S. Government  obligations,  the
holder will resell the stripped  securities in custodial receipt programs with a
number of different names, including "Treasury Income Growth Receipts" ("TIGRs")
and  "Certificate  of Accrual on Treasury  Securities"  ("CATS").  The  stripped
coupons are sold separately from the underlying principal, which is usually sold
at a deep discount because the buyer receives only the right to receive a future
fixed  payment on the  security  and does not  receive  any  rights to  periodic
interest  (cash)  payments.   The  underlying  U.S.  Treasury  bonds  and  notes
themselves  are held in book-entry  form at the Federal  Reserve Bank or, in the
case of bearer  securities (i.e.,  unregistered  securities which are ostensibly
owned by the bearer or holder), in trust on behalf of the owners. Counsel to the
underwriters  of these  certificates  or other  evidences  of  ownership of U.S.
Treasury  securities  have stated  that,  in their  opinion,  purchasers  of the
stripped  securities  most likely will be deemed the  beneficial  holders of the
underlying U.S.  Government  obligations for Federal tax purposes.  The Trust is
not aware of any binding  legislative,  judicial or administrative  authority on
this issue.

         To the extent consistent with its investment objectives, each Portfolio
may purchase  stripped  mortgage-backed  securities  ("SMBS").  SMBS are usually
structured  with two or more classes that receive  different  proportions of the
interest and principal distributions from a pool of mortgage-backed obligations.
A common type of SMBS will have one class  receiving all of the interest,  while
the other class receives all of the principal.  However, in some instances,  one
class will  receive some of the  interest  and most of the  principal  while the
other  class  will  receive  most  of the  interest  and  the  remainder  of the
principal.  If the underlying  obligations  experience  greater than anticipated
prepayments  of  principal,  the  Portfolio may fail to fully recoup its initial
investment  in  these  securities.  The  market  value of the  class  consisting
entirely of principal  payments  generally is extremely  volatile in response to
changes in interest  rates.  The yields on a class of SMBS that  receives all or
most of the interest are generally higher than prevailing market yields on other
mortgage-backed  obligations  because their cash flow patterns are also volatile
and there is a risk that the initial investment will not be fully recouped. SMBS
issued by the U.S.  Government (or a U.S.  Government agency or instrumentality)
may be considered  liquid under  guidelines  established by the Trust's Board of
Trustees if they can be disposed of promptly in the ordinary  course of business
at a value  reasonably  close to that used in the  calculation  of the net asset
value per share.

         Asset-Backed  Securities.  The U.S. Government Securities Portfolio may
purchase  asset-backed  securities  that are secured or backed by mortgages  and
issued by an agency of the U.S.  Government,  and the  Short-Intermediate  Bond,
Bond,   Intermediate  Bond  and  International   Bond  Portfolios  may  purchase
asset-backed securities,  which are securities backed by mortgages,  installment
contracts,  credit card  receivables  or other assets.  Asset-backed  securities
represent  interests in "pools" of assets in which payments of both interest and
principal on the securities are made monthly,  thus in effect "passing  through"
monthly  payments made by the  individual  borrowers on the assets that underlie
the  securities,  net  of any  fees  paid  to the  issuer  or  guarantor  of the
securities.  The  average  life  of  asset-backed  securities  varies  with  the
maturities  of  the   underlying   instruments,   and  the  average  life  of  a
mortgage-backed  instrument,  in particular,  is likely to be substantially less
than the original  maturity of the mortgage pools underlying the securities as a
result of mortgage  prepayments.  For this and other  reasons,  an  asset-backed
security's stated maturity may be shortened, and the security's total return may
be difficult to predict precisely.

         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower  than  expected  prepayments  will  decrease,   yield  to  maturity.   In
calculating the average  weighted  maturity of the U.S.  Government  Securities,
Short-Intermediate   Bond,  Bond,   Intermediate  Bond  and  International  Bond
Portfolios,  the maturity of asset-backed  securities will be based on estimates
of average life.

         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.

         Asset-backed   securities   acquired   by  a   Portfolio   may  include
collateralized  mortgage obligations ("CMOs") issued by private companies.  CMOs
provide  the  holder  with a  specified  interest  in the cash flow of a pool of
underlying  mortgages  or  other  mortgage-backed  securities.  Issuers  of CMOs
ordinarily  elect to be  taxed as  pass-through  entities  known as real  estate
mortgage  investment conduits  ("REMICs").  CMOs are issued in multiple classes,
each with a specified fixed or floating  interest rate and a final  distribution
date.  The relative  payment rights of the various CMO classes may be structured
in a variety of ways. The Portfolios will not purchase "residual" CMO interests,
which normally exhibit greater price volatility.

         There are a number of  important  differences  among the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by the Government National Mortgage  Association  ("GNMA") include GNMA Mortgage
Pass-Through  Certificates (also known as "Ginnie Maes") which are guaranteed as
to the timely  payment of principal  and interest by GNMA and such  guarantee is
backed by the full faith and credit of the United States. GNMA is a wholly-owned
U.S.  Government   corporation  within  the  Department  of  Housing  and  Urban
Development.  GNMA  certificates  also are supported by the authority of GNMA to
borrow  funds  from the U.S.  Treasury  to make  payments  under its  guarantee.
Mortgage-backed  securities issued by the Federal National Mortgage  Association
("FNMA") include FNMA Guaranteed Mortgage Pass-Through  Certificates (also known
as  "Fannie  Maes")  which are solely  the  obligations  of the FNMA and are not
backed by or entitled to the full faith and credit of the United States, but are
supported by the right of the issuer to borrow from the U.S. Treasury. FNMA is a
government-sponsored organization owned entirely by private stockholders. Fannie
Maes are  guaranteed as to timely payment of the principal and interest by FNMA.
Mortgage-related securities issued by the Federal Home Loan Mortgage Corporation
("FHLMC")  include  FHLMC  Mortgage  Participation  Certificates  (also known as
"Freddie  Macs" or "PCs").  FHLMC is a corporate  instrumentality  of the United
States,  created  pursuant  to an Act of  Congress,  which is owned  entirely by
Federal Home Loan Banks. Freddie Macs are not guaranteed by the United States or
by any Federal Home Loan Banks and do not constitute a debt or obligation of the
United States or of any Federal Home Loan Bank.  Freddie Macs entitle the holder
to timely  payment of  interest,  which is  guaranteed  by the FHLMC.  The FHLMC
guarantees  either  ultimate  collection  or  timely  payment  of all  principal
payments on the  underlying  mortgage  loans.  When the FHLMC does not guarantee
timely  payment of  principal,  the FHLMC may remit the amount due on account of
its  guarantee of ultimate  payment of principal at any time after default on an
underlying  mortgage,  but in no event  later  than one  year  after it  becomes
payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support payments on these securities.

         Foreign  Securities.  Each  Portfolio  other  than the U.S.  Government
Securities  and U.S.  Treasury  Index  Portfolios  may invest in bonds and other
fixed income securities of foreign issuers. Unanticipated political, economic or
social  developments  may  affect  the  value of a  Portfolio's  investments  in
emerging  market  countries and the  availability to the Portfolio of additional
investments  in these  countries.  Some of these  countries may have in the past
failed to recognize  private property rights and may have at times  nationalized
or expropriated the assets of private companies. The small size and inexperience
of the securities markets in certain of such countries and the limited volume of
trading in securities in those  countries may make a Portfolio's  investments in
such  countries  illiquid and more  volatile than  investments  in Japan or most
Western European countries, and a Portfolio may be required to establish special
custodial or other  arrangements  before  making  certain  investments  in those
countries.  There may be little  financial or accounting  information  available
with  respect to issuers  located  in certain of such  countries,  and it may be
difficult as a result to assess the value or prospects of an  investment in such
issuers.


         Investors should understand that the expense ratio of the International
Bond  Portfolio can be expected to be higher than those of Portfolios  investing
primarily in domestic securities. The costs attributable to investing abroad are
usually  higher  for  several  reasons,  such as the higher  cost of  investment
research, higher cost of custody of foreign securities,  higher commissions paid
on comparable  transactions on foreign markets and additional costs arising from
delays in settlements of transactions involving foreign securities. Countries in
which the  Short-Intermediate  Bond, Bond,  Intermediate  Bond and International
Bond  Portfolios  may  invest  include,  but  are  not  limited  to:  Argentina,
Australia,  Austria, Belgium, Brazil, Canada, Chile, Colombia, Denmark, Finland,
France, Germany, Greece, Hong Kong, Hungary, Indonesia,  Ireland, Israel, Italy,
Japan, Luxembourg, Malaysia, Mexico, the Netherlands, New Zealand, Norway, Peru,
the Philippines,  Poland, Portugal, Singapore, South Africa, South Korea, Spain,
Sweden, Switzerland, Taiwan, Thailand, Turkey, the United Kingdom and Venezuela.

         The end of the Cold War, the reunification of Germany, the accession of
new Western European members to the European Economic and Monetary Union and the
aspirations of Eastern  European  states to join and other  political and social
events in  Europe  have  caused  considerable  economic,  social  and  political
dislocation.  In addition,  events in the Japanese economy, as well as political
and social  developments  there have affected  Japanese  securities and currency
markets, and the relationship of the Japanese yen with other currencies and with
the U.S. dollar. Future political, economic and social developments in Japan and
in the  Asia/Pacific  regional  context can be  expected  to produce  continuing
effects on securities and currency markets.

         Foreign Currency  Transactions.  In order to protect against a possible
loss on investments  resulting from a decline or  appreciation in the value of a
particular  foreign currency against the U.S. dollar or another foreign currency
or for other reasons, the Short-Intermediate  Bond, Bond,  Intermediate Bond and
International  Bond  Portfolios  are  authorized  to enter into forward  foreign
currency exchange  contracts.  These contracts involve an obligation to purchase
or sell a specified  currency at a future date at a price set at the time of the
contract. Forward currency contracts do not eliminate fluctuations in the values
of  portfolio  securities  but rather  allow a Portfolio  to establish a rate of
exchange for a future point in time.

         When entering into a contract for the purchase or sale of a security, a
Portfolio may enter into a forward foreign  currency  exchange  contract for the
amount of the purchase or sale price to protect against variations,  between the
date the security is purchased or sold and the date on which  payment is made or
received,  in the value of the foreign  currency  relative to the U.S. dollar or
other foreign currency.

         When the  investment  management  team  anticipates  that a  particular
foreign currency may decline substantially  relative to the U.S. dollar or other
leading  currencies,  in order to reduce  risk,  a  Portfolio  may enter  into a
forward  contract to sell,  for a fixed amount,  the amount of foreign  currency
approximating the value of some or all of the Portfolio's securities denominated
in such foreign  currency.  Similarly,  when the obligations held by a Portfolio
create a short  position in a foreign  currency,  the Portfolio may enter into a
forward  contract  to buy,  for a fixed  amount,  an amount of foreign  currency
approximating  the short  position.  A  Portfolio's  net long and short  foreign
currency  exposure  will not exceed its total asset  value.  With respect to any
forward foreign  currency  contract,  it will not generally be possible to match
precisely the amount  covered by that  contract and the value of the  securities
involved  due to the  changes in the values of such  securities  resulting  from
market  movements  between the date the forward contract is entered into and the
date it matures. In addition,  while forward contracts may offer protection from
losses  resulting  from  declines or  appreciation  in the value of a particular
foreign  currency,  they also limit  potential  gains  which  might  result from
changes in the value of such  currency.  A  Portfolio  may also  incur  costs in
connection with forward foreign currency  exchange  contracts and conversions of
foreign currencies and U.S. dollars.

         In addition,  the  International  Bond  Portfolio  may purchase or sell
forward foreign currency exchange  contracts to seek to increase total return or
for cross-hedging  purposes.  The Portfolio may engage in cross-hedging by using
forward contracts in one currency to hedge against  fluctuations in the value of
securities denominated in a different currency if the investment management team
believes that there is a pattern of correlation between the two currencies.

         Liquid assets equal to the amount of a Portfolio's assets that could be
required to consummate forward contracts will be segregated except to the extent
the contracts are otherwise  "covered." The segregated  assets will be valued at
market or fair  value.  If the  market or fair  value of such  assets  declines,
additional  liquid  assets  will be  segregated  daily so that the  value of the
segregated assets will equal the amount of such commitments by the Portfolio.  A
forward contract to sell a foreign currency is "covered" if a Portfolio owns the
currency (or securities denominated in the currency) underlying the contract, or
holds a forward  contract (or call option)  permitting  the Portfolio to buy the
same  currency  at a price that is (i) no higher than the  Portfolio's  price to
sell  the  currency  or (ii)  greater  than  the  Portfolio's  price to sell the
currency  provided the Portfolio  segregates  liquid assets in the amount of the
difference.  A forward  contract  to buy a foreign  currency is  "covered"  if a
Portfolio holds a forward contract (or call option)  permitting the Portfolio to
sell the same  currency  at a price  that is (i) as high as or  higher  than the
Portfolio's  price to buy the currency or (ii) lower than the Portfolio's  price
to buy the  currency  provided the  Portfolio  segregates  liquid  assets in the
amount of the difference.

         Interest Rate Swaps, Floors and Caps and Currency Swaps. The Portfolios
(other than the U.S.  Treasury  Index  Portfolio)  may enter into  interest rate
swaps or purchase  interest rate floors or caps for hedging purposes and not for
speculation.  Interest  rate swaps  involve the  exchange  by a  Portfolio  with
another party of their respective  commitments to pay or receive interest,  such
as an exchange of fixed rate  payments for floating rate  payments.  A Portfolio
will  typically  use  interest  rate swaps to preserve a return on a  particular
investment or portion of its  portfolio or to shorten the effective  duration of
its  portfolio  investments.  The  purchase  of an  interest  rate  floor or cap
entitles the purchaser to receive  payments of interest on a notional  principal
amount from the seller, to the extent the specified index falls below (floor) or
exceeds (cap) a predetermined interest rate. The Portfolios will only enter into
interest rate swaps or interest rate floor or cap  transactions  on a net basis;
i.e.,  the two payment  streams are netted out,  with a Portfolio  receiving  or
paying, as the case may be, only the net amount of the two payments.

         The International  Bond Portfolio may enter into currency swaps,  which
involve the exchange of the rights of the Portfolio and another party to make or
receive  payments in specified  currencies.  Currency swaps usually  involve the
delivery of the entire  principal  value of one designated  currency in exchange
for the other designated currency.

         Inasmuch as interest rate and currency  swaps are entered into for good
faith hedging  purposes,  the Trust and The Northern Trust Company  ("Northern")
believe that such transactions do not constitute senior securities as defined in
the 1940 Act and,  accordingly,  will not  treat  them as being  subject  to the
Portfolio's borrowing  restrictions.  The net amount of the excess, if any, of a
Portfolio's  obligations over its entitlements  with respect to interest rate or
currency  swaps will be accrued on a daily basis and an amount of liquid  assets
having an aggregate  net asset value at least equal to such accrued  excess will
be segregated by the Portfolio.

         The Portfolios will not enter into an interest rate or currency swap or
interest rate floor or cap transaction  unless the unsecured  commercial  paper,
senior debt or the  claims-paying  ability of the other  party  thereto is rated
either A or A-1 or better by Standard & Poor's Ratings Group, Inc. ("S&P"), Duff
& Phelps  Credit  Rating Co.  ("D&P") or Fitch  IBCA  ("Fitch"),  or A or P-1 or
better by Moody's Investors Service, Inc. ("Moody's").  If there is a default by
the other  party to such  transaction,  the  Portfolios  will  have  contractual
remedies pursuant to the agreements related to the transaction.  The swap market
has  grown  substantially  in  recent  years  with a large  number  of banks and
investment  banking  firms  acting both as  principals  and as agents  utilizing
standardized  swap  documentation.  As a  result,  the swap  market  has  become
relatively liquid in comparison with markets for other similar instruments which
are traded in the interbank market.

         Options.  Each  Portfolio  may buy put options and buy call options and
write  covered  call and  secured  put  options.  Such  options  may  relate  to
particular  securities,  financial instruments,  foreign currencies,  foreign or
domestic securities indices or (in the case of the International Bond Portfolio)
the yield differential between two securities ("yield curve options") and may or
may not be listed on a domestic or foreign  securities  exchange (an "Exchange")
or issued by the Options  Clearing  Corporation.  A call option for a particular
security or currency  gives the  purchaser of the option the right to buy, and a
writer the obligation to sell, the underlying security or currency at the stated
exercise price at any time prior to the expiration of the option,  regardless of
the market price of the security or currency.  The premium paid to the writer is
in consideration for undertaking the obligation under the option contract. A put
option for a particular  security or currency  gives the  purchaser the right to
sell the  security or currency at the stated  exercise  price to the  expiration
date of the option,  regardless of the market price of the security or currency.
In  contrast  to an  option  on a  particular  security,  an  option on an index
provides  the holder  with the right to make or receive a cash  settlement  upon
exercise  of the  option.  The  amount of this  settlement  will be equal to the
difference  between the closing  price of the index at the time of exercise  and
the  exercise  price of the  option  expressed  in  dollars,  times a  specified
multiple.

         Options trading is a highly specialized  activity which entails greater
than ordinary  investment  risk.  Options on particular  securities  may be more
volatile than the underlying instruments and, therefore,  on a percentage basis,
an  investment  in  options  may be  subject  to  greater  fluctuation  than  an
investment in the underlying instruments themselves.

         The  Portfolios  will write call options only if they are "covered." In
the case of a call option on a security or currency,  the option is "covered" if
a Portfolio owns the security or currency underlying the call or has an absolute
and immediate right to acquire that security or currency without additional cash
consideration (or, if additional cash  consideration is required,  liquid assets
in such amount are segregated)  upon conversion or exchange of other  securities
or instruments  held by it. For a call option on an index, the option is covered
if  a  Portfolio  maintains  with  its  custodian,  a  portfolio  of  securities
substantially  replicating  the movement of the index, or liquid assets equal to
the contract value. A call option is also covered if a Portfolio holds a call on
the same  security,  currency or index as the call  written  where the  exercise
price of the call held is (i) equal to or less  than the  exercise  price of the
call  written,  or (ii)  greater  than the  exercise  price of the call  written
provided the Portfolio segregates liquid assets in the amount of the difference.
The  Portfolios  will write put options only if they are "secured" by segregated
liquid assets in an amount not less than the exercise price of the option at all
times during the option period.

         With respect to yield curve options,  a call (or put) option is covered
if the  International  Bond Portfolio  holds another call (or put) option on the
spread between the same two securities and segregates  liquid assets  sufficient
to cover the  Portfolio's net liability  under the two options.  Therefore,  the
Portfolio's  liability  for such a covered  option is  generally  limited to the
difference  between  the amount of the  Portfolio's  liability  under the option
written by the  Portfolio  less the value of the option  held by the  Portfolio.
Yield  curve  options  may also be  covered  in such  other  manner as may be in
accordance with the  requirements of the  counterparty  with which the option is
traded and applicable laws and regulations.

         A Portfolio's  obligation  to sell a security or currency  subject to a
covered call option written by it, or to purchase a security or currency subject
to a secured put option written by it, may be terminated prior to the expiration
date  of  the  option  by  the  Portfolio's  execution  of  a  closing  purchase
transaction,  which is  effected by  purchasing  on an exchange an option of the
same series (i.e.,  same  underlying  security or currency,  exercise  price and
expiration  date) as the option  previously  written.  Such a purchase  does not
result in the  ownership  of an  option.  A closing  purchase  transaction  will
ordinarily be effected to realize a profit on an outstanding  option, to prevent
an underlying  security or currency from being called, to permit the sale of the
underlying  security  or  currency  or to permit  the  writing  of a new  option
containing  different  terms  on such  underlying  security.  The cost of such a
liquidation  purchase  plus  transaction  costs may be greater  than the premium
received  upon the  original  option,  in which  event the  Portfolio  will have
incurred  a  loss  in the  transaction.  There  is no  assurance  that a  liquid
secondary market will exist for any particular option. An option writer,  unable
to  effect  a  closing  purchase  transaction,  will  not be able  to  sell  the
underlying  security  or  currency  (in the case of a covered  call  option)  or
liquidate the segregated  assets (in the case of a secured put option) until the
option  expires or the optioned  security or currency is delivered upon exercise
with the  result  that the writer in such  circumstances  will be subject to the
risk of market decline or  appreciation  in the security or currency during such
period.

         When a  Portfolio  purchases  an  option,  the  premium  paid  by it is
recorded as an asset of the Portfolio.  When the Portfolio writes an option,  an
amount equal to the net premium (the  premium less the  commission)  received by
the Portfolio is included in the liability section of the Portfolio's  statement
of assets  and  liabilities  as a deferred  credit.  The amount of this asset or
deferred  credit will be  subsequently  marked-to-market  to reflect the current
value of the option purchased or written. The current value of the traded option
is the last sale price or, in the absence of a sale,  the current bid price.  If
an option purchased by the Portfolio expires unexercised, the Portfolio realizes
a loss equal to the premium paid.  If the  Portfolio  enters into a closing sale
transaction  on an option  purchased by it, the Portfolio will realize a gain if
the premium  received by the Portfolio on the closing  transaction  is more than
the premium paid to purchase the option,  or a loss if it is less.  If an option
written by the Portfolio  expires on the  stipulated  expiration  date or if the
Portfolio enters into a closing purchase transaction, it will realize a gain (or
loss if the cost of a  closing  purchase  transaction  exceeds  the net  premium
received when the option is sold) and the deferred credit related to such option
will be  eliminated.  If an option  written by the Portfolio is  exercised,  the
proceeds of the sale will be  increased by the net premium  originally  received
and the Portfolio will realize a gain or loss.

         There  are  several  risks  associated  with  transactions  in  certain
options. For example, there are significant  differences between the securities,
currency  and options  markets  that could  result in an  imperfect  correlation
between  these  markets,   causing  a  given  transaction  not  to  achieve  its
objectives.  In addition,  a liquid  secondary  market for  particular  options,
whether  traded  over-the-counter  or  on a  national  securities  exchange  (an
"Exchange"), may be absent for reasons which include the following: there may be
insufficient trading interest in certain options; restrictions may be imposed by
an Exchange on opening  transactions or closing  transactions  or both;  trading
halts,  suspensions  or  other  restrictions  may be  imposed  with  respect  to
particular classes or series of options or underlying  securities or currencies;
unusual or  unforeseen  circumstances  may  interrupt  normal  operations  on an
Exchange;  the facilities of an Exchange or the Options Clearing Corporation may
not at all times be adequate to handle  current  trading  value;  or one or more
Exchanges could,  for economic or other reasons,  decide or be compelled at some
future date to  discontinue  the trading of options  (or a  particular  class or
series of options),  in which event the secondary market on that Exchange (or in
that class or series of  options)  would  cease to exist,  although  outstanding
options that had been issued by the Options Clearing  Corporation as a result of
trades on that Exchange  would  continue to be  exercisable  in accordance  with
their terms.

         Futures  Contracts and Related  Options.  Each  Portfolio may invest in
futures  contracts and interest rate futures contracts and may purchase and sell
call and put options on futures contracts for hedging purposes,  for speculative
purposes  (to  seek to  increase  total  return),  or for  liquidity  management
purposes. When used as a hedge, a Portfolio may sell a futures contract in order
to offset a decrease in the market value of its portfolio  securities that might
otherwise  result from a market  decline or currency  exchange  fluctuations.  A
Portfolio  may do so either to hedge the value of its portfolio of securities as
a whole, or to protect against declines, occurring prior to sales of securities,
in the value of the securities to be sold. Conversely,  a Portfolio may purchase
a futures  contract as a hedge in  anticipation  of purchases of securities.  In
addition,  a Portfolio may utilize futures  contracts in anticipation of changes
in the  composition  of its portfolio  holdings.  For a detailed  description of
futures  contracts  and  related  options,  see  Appendix  B to this  Additional
Statement.

         Securities Lending.  Collateral for loans of portfolio  securities made
by a  Portfolio  may consist of cash,  cash  equivalents,  securities  issued or
guaranteed by the U.S. Government or its agencies or irrevocable bank letters of
credit (or any combination thereof). The borrower of securities will be required
to maintain the market value of the collateral at not less than the market value
of the loaned  securities,  and such value will be  monitored  on a daily basis.
When a Portfolio  lends its  securities,  it continues to receive  dividends and
interest on the securities  loaned and may  simultaneously  earn interest on the
investment of the cash collateral. Although voting rights, or rights to consent,
attendant to securities on loan pass to the borrower,  such loans will be called
so that the securities may be voted by a Portfolio if a material event affecting
the investment is to occur.

         Forward  Commitments,   When-Issued  Securities  and  Delayed  Delivery
Transactions.  Each Portfolio may purchase  securities on a when-issued basis or
purchase or sell securities on a forward  commitment  (sometimes  called delayed
delivery)  basis.  These  transactions  involve a commitment by the Portfolio to
purchase  or sell  securities  at a future  date.  The  price of the  underlying
securities  (usually  expressed  in  terms  of  yield)  and the  date  when  the
securities will be delivered and paid for (the settlement date) are fixed at the
time the transaction is negotiated. When-issued purchases and forward commitment
transactions are normally negotiated directly with the other party.

         A Portfolio will purchase securities on a when-issued basis or purchase
or sell  securities  on a forward  commitment  basis only with the  intention of
completing the transaction and actually purchasing or selling the securities. If
deemed advisable as a matter of investment  strategy,  however,  a Portfolio may
dispose of or negotiate a commitment  after  entering into it. A Portfolio  also
may sell  securities it has committed to purchase  before those  securities  are
delivered to the Portfolio on the  settlement  date. The Portfolio may realize a
capital gain or loss in connection with these transactions.

         When a  Portfolio  purchases  securities  on a  when-issued  or forward
commitment  basis,  the Portfolio  will  segregate  liquid assets having a value
(determined  daily) at least  equal to the  amount of the  Portfolio's  purchase
commitments  until three days prior to the settlement  date, or otherwise  cover
its position.  These  procedures  are designed to ensure that the Portfolio will
maintain  sufficient  assets  at  all  times  to  cover  its  obligations  under
when-issued  purchases,  forward commitments and delayed-delivery  transactions.
For purposes of determining a Portfolio's average dollar-weighted  maturity, the
maturity of when-issued or forward commitment securities will be calculated from
the commitment date.

         Commercial Paper, Bankers'  Acceptances,  Certificates of Deposit, Time
Deposits  and Bank  Notes.  Commercial  paper  represents  short-term  unsecured
promissory  notes  issued in  bearer  form by banks or bank  holding  companies,
corporations  and finance  companies.  Certificates  of deposit  are  negotiable
certificates  issued against funds deposited in a commercial bank for a definite
period  of time  and  earning  a  specified  return.  Bankers'  acceptances  are
negotiable  drafts  or bills of  exchange,  normally  drawn  by an  importer  or
exporter  to pay for  specific  merchandise,  which  are  "accepted"  by a bank,
meaning, in effect, that the bank  unconditionally  agrees to pay the face value
of the instrument on maturity.  Fixed time deposits are bank obligations payable
at a stated  maturity  date and bearing  interest  at a fixed  rate.  Fixed time
deposits may be withdrawn on demand by the investor, but may be subject to early
withdrawal  penalties  that  vary  depending  upon  market  conditions  and  the
remaining maturity of the obligation.  There are no contractual  restrictions on
the right to transfer a  beneficial  interest in a fixed time deposit to a third
party.  Bank notes rank  junior to deposit  liabilities  of banks and pari passu
with other senior,  unsecured obligations of the bank. Bank notes are classified
as  "other  borrowings"  on a bank's  balance  sheet,  while  deposit  notes and
certificates  of deposit are classified as deposits.  Bank notes are not insured
by the Federal Deposit Insurance Corporation or any other insurer. Deposit notes
are insured by the Federal Deposit  Insurance  Corporation only to the extent of
$100,000 per depositor per bank.

         A Portfolio  may invest a portion of its assets in the  obligations  of
foreign banks and foreign branches of domestic banks.  Such obligations  include
Eurodollar  Certificates of Deposit  ("ECDs") which are U.S.  dollar-denominated
certificates  of deposit issued by offices of foreign and domestic banks located
outside the United  States;  Eurodollar  Time Deposits  ("ETDs")  which are U.S.
dollar-denominated  deposits  in a foreign  branch  of a U.S.  bank or a foreign
bank;  Canadian Time Deposits  ("CTDs") which are  essentially  the same as ETDs
except they are issued by Canadian offices of major Canadian banks; Schedule Bs,
which are obligations  issued by Canadian branches of foreign or domestic banks;
Yankee Certificates of Deposit ("Yankee CDs") which are U.S.  dollar-denominated
certificates  of deposit  issued by a U.S.  branch of a foreign bank and held in
the United States; and Yankee Bankers' Acceptances ("Yankee BAs") which are U.S.
dollar-denominated  bankers'  acceptances  issued by a U.S.  branch of a foreign
bank and held in the United States.

         Commercial  paper  and  other  short-term  obligations  acquired  by  a
Portfolio  will be rated A-2 or higher by S&P, P-2 or higher by Moody's,  D-2 or
higher  by Duff,  or F-2 or  higher  by Fitch at the  time of  purchase  or,  if
unrated, determined to be of comparable quality by the Investment Advisers.

         Insurance Funding  Agreements.  The  Short-Intermediate  Bond, Bond and
Intermediate  Bond  Portfolios  may  invest  in  insurance  funding   agreements
("IFAs").  An IFA is  normally a general  obligation  of the  issuing  insurance
company and not a separate  account.  The purchase price paid for an IFA becomes
part of the general  assets of the insurance  company,  and the contract is paid
from  the  company's  general  assets.  Generally,  IFAs are not  assignable  or
transferable without the permission of the issuing insurance  companies,  and an
active secondary market in IFAs may not exist.

         Zero Coupon,  Pay-in-Kind and Capital Appreciation Bonds. To the extent
consistent  with their  respective  investment  objectives,  each  Portfolio may
invest in zero coupon bonds,  capital appreciation bonds and pay-in-kind ("PIK")
securities.  Zero  coupon and  capital  appreciation  bonds are debt  securities
issued or sold at a discount  from their face value and which do not entitle the
holder to any  periodic  payment of  interest  prior to  maturity or a specified
date. The original issue discount  varies  depending on the time remaining until
maturity or cash payment date,  prevailing  interest rates, the liquidity of the
security and the perceived  credit quality of the issuer.  These securities also
may take the form of debt  securities that have been stripped of their unmatured
interest   coupons,   the  coupons   themselves  or  receipts  or   certificates
representing  interests in such stripped debt obligations or coupons. The market
prices of zero  coupon  bonds,  capital  appreciation  bonds and PIK  securities
generally  are  more  volatile  than  the  market  prices  of  interest  bearing
securities  and are likely to respond to a greater degree to changes in interest
rates than interest  bearing  securities  having  similar  maturities and credit
quality.

         PIK securities may be debt obligations or preferred shares that provide
the issuer with the option of paying  interest or dividends on such  obligations
in cash or in the form of  additional  securities  rather than cash.  Similar to
zero coupon bonds, PIK securities are designed to give an issuer  flexibility in
managing cash flow. PIK securities that are debt securities can either be senior
or subordinated debt and generally trade flat (i.e.,  without accrued interest).
The trading price of PIK debt securities  generally reflects the market value of
the underlying debt plus an amount representing  accrued interest since the last
interest payment.

         Zero  coupon  bonds,  capital  appreciation  bonds  and PIK  securities
involve the  additional  risk that,  unlike  securities  that  periodically  pay
interest to maturity,  a Portfolio will realize no cash until a specified future
payment date unless a portion of such  securities  is sold and, if the issuer of
such  securities  defaults,  a  Portfolio  may  obtain  no  return at all on its
investment.  In  addition,  even though such  securities  do not provide for the
payment of current interest in cash, the Portfolios are nonetheless  required to
accrue  income on such  investments  for each  taxable  year and  generally  are
required to distribute such accrued amounts (net of deductible expenses, if any)
to avoid being subject to tax. Because no cash is generally received at the time
of the  accrual,  a  Portfolio  may be  required to  liquidate  other  portfolio
securities  to  obtain  sufficient  cash to  satisfy  Federal  tax  distribution
requirements applicable to the Portfolio.

         Variable and Floating  Rate  Instruments.  With respect to the variable
and  floating  rate  instruments  that may be  acquired by the  Portfolios,  the
investment management team will consider the earning power, cash flows and other
liquidity  ratios of the issuers and guarantors of such  instruments and, if the
instruments are subject to demand features,  will monitor their financial status
and ability to meet payment on demand. Where necessary to ensure that a variable
or floating rate instrument  meets the  Portfolios'  quality  requirements,  the
issuer's  obligation to pay the principal of the instrument will be backed by an
unconditional  bank letter or line of credit,  guarantee or  commitment to lend.

         Variable and  floating  rate  instruments  eligible for purchase by the
Portfolios  include  variable  amount  master  demand  notes,  which  permit the
indebtedness   thereunder   to  vary  in  addition  to  providing  for  periodic
adjustments  in the interest  rate,  and  leveraged  inverse  floating rate debt
instruments ("inverse floaters"). The interest rate on an inverse floater resets
in the opposite  direction from the market rate of interest to which the inverse
floater is indexed.  An inverse floater may be considered to be leveraged to the
extent that its interest  rate varies by a magnitude  that exceeds the magnitude
of the  change in the index rate of  interest.  The  higher  degree of  leverage
inherent in inverse  floaters is  associated  with greater  volatility  in their
market values.  Accordingly,  the duration of an inverse  floater may exceed its
stated  final  maturity.  The  Portfolios  may deem the maturity of variable and
floating rate instruments to be less than their stated maturities based on their
variable and floating rate features and/or their put features.  Unrated variable
and floating rate  instruments will be determined by Northern and Northern Trust
Quantitative  Advisors,   Inc.  ("NTQA"  and  collectively  with  Northern,  the
"Investment  Advisers") to be of  comparable  quality at the time of purchase to
rated instruments which may be purchased by the Portfolios.

         Variable and floating rate instruments  including inverse floaters held
by a Portfolio  will be subject to the  Portfolio's  15%  limitation on illiquid
investments  when the Portfolio may not demand  payment of the principal  amount
within seven days absent a reliable trading market.

         Investment Companies. With respect to the investments of the Portfolios
in the  securities  of other  investment  companies,  such  investments  will be
limited so that,  as  determined  after a purchase is made,  either (a) not more
than 3% of the total outstanding stock of such investment  company will be owned
by a Portfolio, the Trust as a whole and their affiliated persons (as defined in
the 1940 Act);  or (b)(i) not more than 5% of the value of the total assets of a
Portfolio will be invested in the securities of any one investment company, (ii)
not more than 10% of the  value of its  total  assets  will be  invested  in the
aggregate in securities of investment  companies as a group,  and (iii) not more
than 3% of the  outstanding  voting stock of any one investment  company will be
owned by the Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolios may not be obligated to redeem such securities in an amount exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.

     If required by the 1940 Act, each  Portfolio  expects to vote the shares of
other  investment  companies  that are held by it in the same  proportion as the
vote of all
other holders of such securities.

         A  Portfolio  may  invest all or  substantially  all of its assets in a
single open-end investment company or series thereof with substantially the same
investment objective,  policies and restrictions as the Portfolio. However, each
Portfolio  currently  intends to limit its  investments in securities  issued by
other investment companies to the extent described above. A Portfolio may adhere
to more  restrictive  limitations  with respect to its investments in securities
issued by other  investment  companies if required by the SEC or deemed to be in
the best interests of the Trust.

         Repurchase  Agreements.  Each Portfolio may agree to purchase portfolio
securities  from  financial  institutions  subject to the seller's  agreement to
repurchase  them  at  a  mutually  agreed  upon  date  and  price   ("repurchase
agreements").  Repurchase  agreements are  considered  loans under the 1940 Act.
Securities  subject to  repurchase  agreements  are held  either by the  Trust's
custodian  (or  subcustodian,  if  any),  or  in  the  Federal  Reserve/Treasury
Book-Entry System.  The seller under a repurchase  agreement will be required to
maintain  the value of the  securities  subject  to the  agreement  in an amount
exceeding the repurchase  price  (including  accrued  interest).  Default by the
seller would, however,  expose the Portfolio to possible loss because of adverse
market  action or delay in connection  with the  disposition  of the  underlying
obligations.

         Reverse  Repurchase  Agreements.  Each  Portfolio  may borrow  funds by
selling  portfolio  securities  to  financial  institutions  such as  banks  and
broker/dealers  and agreeing to repurchase them at a mutually specified date and
price ("reverse repurchase agreements").  The Portfolios may use the proceeds of
reverse repurchase  agreements to purchase other securities either maturing,  or
under  an  agreement  to  resell,  at a date  simultaneous  with or prior to the
expiration of the reverse repurchase  agreement.  Reverse repurchase  agreements
involve the risk that the market value of the securities sold by a Portfolio may
decline below the repurchase  price. The Portfolios will pay interest on amounts
obtained pursuant to a reverse  repurchase  agreement.  While reverse repurchase
agreements  are  outstanding,  a Portfolio  will  segregate  liquid assets in an
amount  at least  equal to the  market  value of the  securities,  plus  accrued
interest, subject to the agreement. Reverse repurchase agreements are considered
to be borrowings under the 1940 Act.

         Risks Related to Lower-Rated  Securities.  While any investment carries
some risk,  certain risks associated with  lower-rated  securities are different
than those for investment-grade  securities. The risk of loss through default is
greater  because  lower-rated  securities  are usually  unsecured  and are often
subordinate to an issuer's other obligations. Additionally, the issuers of these
securities  frequently  have high debt  levels  and are thus more  sensitive  to
difficult  economic  conditions,  individual  corporate  developments and rising
interest rates. Consequently,  the market price of these securities may be quite
volatile and may result in wider  fluctuations  of a Portfolio's net asset value
per share.

         There  remains  some  uncertainty  about the  performance  level of the
market  for   lower-rated   securities   under   adverse   market  and  economic
environments.  An economic  downturn or increase in interest  rates could have a
negative  impact on both the market for lower-rated  securities  (resulting in a
greater number of bond defaults) and the value of lower-rated securities held in
a portfolio of investments.

         The  economy  and  interest  rates can  affect  lower-rated  securities
differently  than other  securities.  For  example,  the  prices of  lower-rated
securities  are  more  sensitive  to  adverse  economic  changes  or  individual
corporate  developments  than are the  prices of  higher-rated  investments.  In
addition,  during an  economic  downturn or period in which  interest  rates are
rising   significantly,   highly  leveraged  issuers  may  experience  financial
difficulties,  which, in turn,  would adversely  affect their ability to service
their principal and interest payment obligations,  meet projected business goals
and obtain additional financing.

         If an issuer of a security  defaults,  a Portfolio may incur additional
expenses to seek recovery.  In addition,  periods of economic  uncertainty would
likely  result in  increased  volatility  for the market  prices of  lower-rated
securities as well as a Portfolio's net asset value. In general, both the prices
and yields of lower-rated securities will fluctuate.

         In certain  circumstances it may be difficult to determine a security's
fair value due to a lack of reliable objective information. Such instances occur
where  there is not an  established  secondary  market for the  security  or the
security is lightly traded.  As a result, a Portfolio's  valuation of a security
and the price it is  actually  able to obtain when it sells the  security  could
differ.

         Adverse  publicity  and investor  perceptions,  whether or not based on
fundamental  analysis,  may  decrease  the value and  liquidity  of  lower-rated
securities held by a Portfolio,  especially in a thinly traded market.  Illiquid
or restricted  securities held by the Portfolio may involve special registration
responsibilities,  liabilities and costs,  and could involve other liquidity and
valuation difficulties.

         The S&P,  Moody's,  Duff,  Fitch and Thompson Bank Watch,  Inc. ("TBW")
evaluate the safety of a lower-rated security's principal and interest payments,
but does not  address  market  value  risk.  Because  the  ratings of the rating
agencies may not always reflect  current  conditions and events,  in addition to
using  recognized  rating  agencies and other sources,  the Investment  Advisers
perform  their own  analysis of the issuers  whose  lower-rated  securities  the
Portfolios purchase.  Because of this, a Portfolio's performance may depend more
on their own  credit  analysis  than is the case of mutual  funds  investing  in
higher-rated securities.

         In selecting lower-rated  securities,  the Investment Advisers consider
factors such as those relating to the  creditworthiness of issuers,  the ratings
and performance of the securities,  the protections  afforded the securities and
the diversity of a Portfolio's  investment  portfolio.  The Investment  Advisers
monitor  the issuers of  lower-rated  securities  held by a Portfolio  for their
ability to make  required  principal  and  interest  payments,  as well as in an
effort to control the liquidity of the Portfolio so that it can meet  redemption
requests.

         Yields and Ratings.  The yields on certain  obligations,  including the
instruments in which the  Portfolios  may invest,  are dependent on a variety of
factors,  including  general  market  economic  conditions,  conditions  in  the
particular market for the obligation, financial condition of the issuer, size of
the offering,  maturity of the obligation and ratings of the issue.  The ratings
of S&P, Moody's,  Duff, Fitch and TBW represent their respective  opinions as to
the quality of the obligations  they undertake to rate.  Ratings,  however,  are
general and are not  absolute  standards of quality.  Consequently,  obligations
with the same  rating,  maturity  and interest  rate may have  different  market
prices.  For a more  complete  discussion  of  ratings,  see  Appendix A to this
Additional Statement.

         Subject to the limitations stated in the Prospectus, if a security held
by a Portfolio  undergoes a rating revision,  the Portfolio may continue to hold
the security if the Investment Advisers determine such retention is warranted.

         Relative  Value  Approach.  In buying and  selling  securities  for the
Portfolios,  the investment management team uses a relative value approach. This
approach  involves an analysis of  economic  and market  information,  including
economic growth rates,  interest and inflation rates,  deficit levels, the shape
of the yield  curve,  sector and  quality  spreads  and risk  premiums.  It also
involves the use of proprietary valuation models to analyze and compare expected
returns and assumed  risks.  Under the relative value  approach,  the investment
management  team will emphasize  particular  securities and particular  types of
securities  that the team believes  will provide a favorable  return in light of
these risks.

         Tracking  Variance.  As discussed in the Prospectus,  the U.S. Treasury
Index Portfolio is subject to the risk of tracking  variance.  Tracking variance
may result from share purchases and redemptions, transaction costs, expenses and
other factors.  Share purchases and redemptions may necessitate the purchase and
sale of securities by the  Portfolio and the resulting  transaction  costs which
may be  substantial  because  of  the  number  and  the  characteristics  of the
securities  held. In addition,  transaction  costs are incurred because sales of
securities   received  in  connection   with   spin-offs  and  other   corporate
reorganizations are made to conform the Portfolio's holdings with its investment
objective.  Tracking  variance may also occur due to factors such as the size of
the Portfolio,  the maintenance of a cash reserve pending  investment or to meet
expected  redemptions,  changes made in the Portfolio's  designated Index or the
manner in which the Index is calculated  or because the indexing and  investment
approach of the  Investment  Adviser does not produce the  intended  goal of the
Portfolio.  Tracking  variance is monitored by the  Investment  Adviser at least
quarterly.  In the event the  performance  of the Portfolio is not comparable to
the performance of its designated Index, the Board of Trustees will evaluate the
reasons for the  deviation  and the  availability  of  corrective  measures.  If
substantial  deviation  in the  Portfolio's  performance  were to  continue  for
extended  periods,  it is  expected  that the Board of Trustees  would  consider
recommending to  shareholders  possible  changes to the  Portfolio's  investment
objective.

         Calculation of Portfolio Turnover Rate. The portfolio turnover rate for
the  Portfolios  is  calculated  by dividing the lesser of purchases or sales of
portfolio  investments for the reporting  period by the monthly average value of
the portfolio  investments  owned during the reporting  period.  The calculation
excludes all securities, including options, whose maturities or expiration dates
at the time of  acquisition  are one year or less.  Portfolio  turnover may vary
greatly  from  year to year as well as  within  a  particular  year,  and may be
affected by cash requirements for redemption of shares and by requirements which
enable the Portfolios to receive favorable tax treatment.

Investment Restrictions

         Each Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below which may be changed with  respect to a  particular  Portfolio
only by a vote of the  holders of a  majority  of such  Portfolio's  outstanding
shares.

No Portfolio may:

          (1)  Make loans,  except for (a) the purchase of debt  obligations  in
               accordance   with  the  Portfolio's   investment   objective  and
               policies, (b) repurchase agreements with banks, brokers,  dealers
               and other financial institutions, (c) loans of securities and (d)
               loans to affiliates  of the portfolio to the extent  permitted by
               law.

          (2)  Purchase  or sell real  estate,  but this  restriction  shall not
               prevent a Portfolio  from  investing  directly or  indirectly  in
               portfolio instruments secured by real estate or interests therein
               or acquiring securities of real estate investment trusts or other
               issuers that deal in real estate.

          (3)  Invest in  commodities or commodity  contracts,  except that each
               Portfolio  may invest in currency and financial  instruments  and
               contracts that are commodities or commodity contracts.

          (4)  Invest in companies for the purpose of exercising control.

          (5)  Act as underwriter  of  securities,  except as a Portfolio may be
               deemed to be an  underwriter  under the Securities Act of 1933 in
               connection with the purchase and sale of portfolio instruments in
               accordance with its investment objective and portfolio management
               policies.

          (6)  Purchase  securities (other than obligations issued or guaranteed
               by the U.S.  Government,  its agencies or  instrumentalities)  if
               such  purchase  would cause more than 25% in the aggregate of the
               market value of the total assets of a Portfolio to be invested in
               the  securities  of one or more issuers  having  their  principal
               business activities in the same industry.

          For  the purposes of this restriction,  as to utility  companies,  the
               gas,  electric,  water and telephone  businesses  are  considered
               separate  industries;   personal  credit  finance  companies  and
               business  credit  finance  companies  are  deemed to be  separate
               industries;  and wholly-owned finance companies are considered to
               be in the  industries  of their parents if their  activities  are
               primarily related to financing the activities of their parents.

          (7)  Borrow money,  except that to the extent  permitted by applicable
               law (a) the  Portfolio  may borrow from banks,  other  affiliated
               investment companies and other persons, and may engage in reverse
               repurchase   agreements  and  other  transactions  which  involve
               borrowings,  in  amounts  up to  33  1/3%  of  its  total  assets
               (including  the  amount   borrowed)  or  such  other   percentage
               permitted  by  law,  (b)  the  Portfolio  may  borrow  up  to  an
               additional 5% of its total assets for temporary purposes, (c) the
               Portfolio may obtain such short-term  credits as may be necessary
               for the clearance of purchases and sales of portfolio securities,
               and (d) the Portfolio may purchase  securities on margin.  If due
               to market fluctuations or other reasons a Portfolio's  borrowings
               exceed the  limitations  stated  above,  the Trust will  promptly
               reduce the  borrowings of such  Portfolio in accordance  with the
               1940 Act.  In  addition,  as a matter of  fundamental  policy,  a
               Portfolio  will not issue  senior  securities  to the extent such
               issuance would violate applicable law.

          (8)  Notwithstanding  any of the Trust's other fundamental  investment
               restrictions (including,  without limitation,  those restrictions
               relating to issuer  diversification,  industry  concentration and
               control),  each  Portfolio  may (a) purchase  securities of other
               investment  companies to the full extent  permitted under Section
               12 of the 1940 Act (or any successor  provision thereto) or under
               any   regulation  or  order  of  the   Securities   and  Exchange
               Commission; and (b) invest all or substantially all of its assets
               in a single  open-end  investment  company or series thereof with
               substantially  the  same  investment   objective,   policies  and
               fundamental restrictions as the Portfolio.

     In   addition,   with   respect   to  the   U.S.   Government   Securities,
Short-Intermediate, U.S. Treasury Index, Bond and Intermediate Bond Portfolios:

          (9)  The Portfolio may not make any investment  inconsistent  with the
               Portfolio's  classification as a diversified  investment  company
               under the 1940 Act, provided that this restriction does not apply
               to the International Bond Portfolio.

     In applying  Restriction No. 6 above, a security is considered to be issued
by the entity,  or  entities,  whose assets and revenues  back the  security.  A
guarantee of a security is not deemed to be a security  issued by the  guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by the  Portfolio,  does not  exceed  10% of the value of the  Portfolio's
total assets.

         Except to the extent otherwise provided in Investment Restriction No. 8
for the purpose of such restriction,  in determining industry classification the
Trust  intends  to use  the  industry  classification  titles  in  the  Standard
Industrial  Classification  Manual (except that the International Bond Portfolio
will  use the  Morgan  Stanley  Capital  International  industry  classification
titles).  Securities  held in escrow or separate  accounts in connection  with a
Portfolio's  investment  practices described in this Additional Statement and in
the  Prospectus  are not deemed to be  mortgaged,  pledged or  hypothecated  for
purposes of the foregoing Investment Restrictions.


         As a non-fundamental investment restriction that can be changed without
shareholder  approval,  the International  Bond Portfolio may not, at the end of
any tax quarter,  hold more than 10% of the outstanding voting securities of any
one  issuer,  except  that up to 50% of the  total  value of the  assets  of the
Portfolio  may  be  invested  in any  securities  without  regard  to  this  10%
limitation  so long as no more  than 25% of the  total  value of its  assets  is
invested in the  securities of any one issuer (except the U.S.  Government).  In
addition,  the  International  Bond  Portfolio  may  not,  at the end of any tax
quarter,  invest more than 5% of the total value of its assets in the securities
of any one issuer (except U.S. Government securities),  except that up to 50% of
the total value of the  Portfolio's  assets may be  invested  in any  securities
without  regard to this 5%  limitation  so long as no more than 25% of the total
value of its assets is invested in the securities of any one issuer (except U.S.
Government securities).

         Any  restriction  which  involves  a  maximum  percentage  will  not be
considered  violated  unless an excess over the  percentage  occurs  immediately
after,  and is caused by, an  acquisition or encumbrance of securities or assets
of, or borrowings by, a Portfolio.

ADDITIONAL TRUST INFORMATION

 Trustees and Officers

The business and affairs of the Trust and each  Portfolio  are managed under the
direction  of the  Trust's  Board of  Trustees.  Information  pertaining  to the
Trustees and officers of the Trust is set forth below.



<PAGE>
<TABLE>
<CAPTION>
<S>                                    <C>         <C>               <C>


Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Stephen Timbers                        55****       Chairman    and  President of Northern Trust Global
                                                    Trustee          Investments, a division of Northern Trust
                                                                     Corporation since 1998; President, Chief
                                                                     Executive Officer and Director of Zurich
                                                                     Kemper Investments from 1996 to 1998;
                                                                     President and Chief Operating Officer of
                                                                     Kemper Corporation from 1992 to 1996;
                                                                     President and Director Kemper Funds from 1990
                                                                     to 1998.  Director: LTV Corporation. Trustee:
                                                                     Northern Funds.


<PAGE>







Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Mr. Wesley M. Dixon, Jr.               72           Trustee          Director of Earl Kinship Capital Corporation
400 Skokie Blvd., Suite 300                                          since 1985, Vice Chairman and Director of G.D.
Northbrook, Illinois  60062                                          Searle & Co. (manufacture and sale of food
                                                                     products and pharmaceuticals) from 1977 to
                                                                     1983 and President of G.D. Searle & Co. prior
                                                                     thereto.  Trustee: Northern Funds.

Mr. William J. Dolan, Jr.              67           Trustee          Partner of Arthur Andersen & Co. S.C.
1534 Basswood Circle                                                 (accounting firm) from 1966 until his
Glenview, Illinois  60025                                            retirement in December 1989.  Financial
                                                                     Consultant, Ernst & Young from 1992 to 1993
                                                                     and 1997. Director: Household Bank, First
                                                                     Central National Life Insurance Company and
                                                                     Director of First Central National Life
                                                                     Insurance Company since July 1998.  Trustee:
                                                                     Northern Funds.

Mr. Raymond E. George, Jr.             69*          Trustee          Senior Vice President and Senior Fiduciary
703 Prospect Avenue                                                  Officer of The Northern Trust Company from
Winnetka, Illinois  60093                                            1990 until his retirement in October 1993.
                                                                     Trustee: Northern Funds.

Mr. Michael E. Murphy                  63**         Trustee          President of Sara Lee Foundation since
Suite 2222                                                           November 1997.  Vice Chairman and Chief
20 South Clark Street                                                Administrative Officer of Sara Lee Corporation
Chicago, Illinois  60603                                             (consumer products) from November 1994 to
                                                                     October 1997; Vice Chairman and Chief
                                                                     Financial and Administrative Officer of Sara
                                                                     Lee Corporation from July 1993 to November
                                                                     1994. Director: Payless Shoe Source, Inc.,
                                                                     True North Communications, Inc., American
                                                                     General Corporation, GATX Corporation and
                                                                     Bassett Furniture Industries, Inc.  Trustee:
                                                                     Northern Funds.

Mary Jacobs Skinner, Esquire           42***        Trustee          Partner in the law firm of Sidley & Austin.
One First National Plaza                                             Trustee: Northern Funds.
Chicago, Illinois  06063



<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

William H. Springer                    71           Trustee          Vice Chairman of Ameritech (a
701 Morningside Drive                                                telecommunications holding company) from
Lake Forest, IL 60045                                                February 1987 until his retirement in August
                                                                     1992; Vice Chairman, Chief Financial and
                                                                     Administrative Officer of Ameritech prior
                                                                     1987. Director of Walgreen Co. (a retail drug
                                                                     store business); Baker, Fentress & Co. (a
                                                                     closed-end, non-diversified management
                                                                     investment company). Trustee of Goldman Sachs
                                                                     Trust; Goldman Sachs Variable Insurance Trust.
                                                                     Trustee:  Northern Funds.

Richard G. Cline                       65           Trustee          Chairman, Hawthorne Investors, Inc. (a
4200 Commerce Court,                                                 management advisory services and private
Suite 300                                                            investment company) since January 1996;
Lisle, IL 60532                                                      Chairman, Hussman International, Inc. (a
                                                                     refrigeration company) since January 1998,
                                                                     Chairman and CEO of NICOR Inc. (a diversified
                                                                     public utility holding company) from 1986 to
                                                                     1995, and President, 1992-1993; Chairman,
                                                                     Federal Reserve Bank of Chicago from 1992 to
                                                                     1995; and Deputy Chairman from 1995 to 1996.
                                                                     Director: Whitman Corporation (a diversified
                                                                     holding company), Kmart Corporation (a
                                                                     retailing company), Ryerson Tull, Inc. (a
                                                                     metals distribution company) and University of
                                                                     Illinois Foundation. Trustee:  Northern Funds.



<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Edward J. Condon, Jr.                  60           Trustee          Chairman of The Paradigm Group, Ltd. (a
Sears Tower, Suite 9650                                              financial advisor) since July 1993; Vice
233 S. Wacker Drive                                                  President and Treasurer of Sears, Roebuck and
Chicago, IL 60606                                                    Co. (retail corporation) from February 1989 to
                                                                     July 1993; Member of Advisory Board of
                                                                     Real-Time USA, Inc. (a software company);
                                                                     Member of the Board of Managers of The Liberty
                                                                     Hampshire Company, LLC (a receivable
                                                                     securitization company); Vice Chairman and
                                                                     Director of Energenics L.L.C. Director:
                                                                     University Eldercare, Inc.; Financial Pacific
                                                                     Company Trustee: Dominican University.
                                                                     Trustee:  Northern Funds.

John W. English                        67           Trustee          Private Investor; Vice President and Chief
50-H New England Ave.                                                Investment Officer of The Ford Foundation (a
P.O. Box 640                                                         charitable trust) from 1981 to 1993.  Trustee:
Summit, NJ 07902-0640                                                The China Fund, Inc., Select Sector SPDR
                                                                     Trust; WM Funds; American Red Cross in Greater
                                                                     New York; Mote Marine Laboratory (a non-profit
                                                                     marine research facility); and United Board
                                                                     for Christian Higher Education in Asia.
                                                                     Director: University of Iowa Foundation,
                                                                     Blanton-Peale Institutes of Religion and
                                                                     Health; Community Foundation of Sarasota
                                                                     County; Duke Management Company (an investment
                                                                     adviser); and John Ringling Centre Foundation.
                                                                     Trustee:  Northern Funds.


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Sandra Polk Guthman                    56           Trustee          President and CEO of Polk Bros. Foundation (an
420 N. Wabash Avenue                                                 Illinois not-for-profit corporation) from 1993
Suite 204                                                            to present; Director of Business
Chicago, IL 60611                                                    Transformation from 1992-1993, and Midwestern
                                                                     Director of Marketing from 1988-1992, IBM (a
                                                                     technology company); Director: MBIA Insurance
                                                                     Corporation of Illinois (bank holding
                                                                     company); MB Financial Corp. (a stock savings
                                                                     and loan holding company). Trustee:  Northern
                                                                     Funds.

Richard P. Strubel                     61           Trustee          President and Chief Operating Officer,
737 N. Michigan Avenue                                               Unext.com since 1999; Managing Director of
Suite 1405                                                           Tandem Partners, Inc. (a privately held
Chicago, IL 60611                                                    management services firm) since 1990 to 1999;
                                                                     President and Chief Executive Officer,
                                                                     Microdot, Inc. (a privately held manufacturing
                                                                     firm) from 1984 to 1994; Director: Gildan
                                                                     Activewear, Inc.; Children's Memorial Medical
                                                                     Center. Trustee:  University of Chicago;
                                                                     Goldman Sachs Trust; Goldman Sachs Variable
                                                                     Insurance Trust. Trustee:  Northern Funds.

Jylanne M. Dunne                       40           President        Senior Vice President for Distribution
4400 Computer Drive                                                  Services at PFPC Inc. ("PFPC") (formerly First
Westborough, MA 01581                                                Data Investor Services Group, Inc. ("FDISG"))
                                                                     (since 1988).

Richard H. Rose                        44           Vice President   Vice President and Division Manager of Mutual
4400 Computer Drive                                                  Fund Administration at PFPC (formerly FDISG)
Westborough, MA 01581                                                (since 1994).

Brian R. Curran                        32           Treasurer        Director of Fund Administration at PFPC
4400 Computer Drive                                                  (formerly FDISG) (since 1997); Director of
Westborough, MA 01581                                                Fund Administration at State Street Bank &
                                                                     Trust
                                                                     Company
                                                                     (February
                                                                     1997     to
                                                                     October
                                                                     1997);
                                                                     Senior
                                                                     Auditor  at
                                                                     Price
                                                                     Waterhouse
                                                                     L.L.P.
                                                                     (February
                                                                     1994     to
                                                                     February
                                                                     1997).


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Judith E. Clear                        33           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC since 1997; Compliance
Westborough, MA 01581                                                Manager at Citizens Trust from 1994 to 1996.

Suzanne E. Anderson                    27           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC Inc. (since August
Westborough, MA 01581                                                1998); Manager of Fund Administration at State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1996     to
                                                                     August
                                                                     1998); Fund
                                                                     Administrator
                                                                     at    State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1995     to
                                                                     October
                                                                     1996);
                                                                     Mutual Fund
                                                                     Accountant
                                                                     at      The
                                                                     Boston
                                                                     Company
                                                                     (prior
                                                                     thereto).

Linda J. Hoard                         52           Secretary        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                                  1998); Attorney Consultant for Fidelity
Westborough, MA 01581                                                Management & Research (a financial service
                                                                     company);
                                                                     Investors
                                                                     Bank      &
                                                                     Trust
                                                                     Company  (a
                                                                     financial
                                                                     service
                                                                     provider)
                                                                     and   FDISG
                                                                     (September
                                                                     1994     to
                                                                     June 1998).

Teresa M.R. Hamlin                     35           Assistant        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                 Secretary        1994).
Westborough, MA 01581

Therese Hogan                          37           Assistant        Director of the State Regulation Department at
4400 Computer Drive                                 Secretary        PFPC (formerly FDISG) (since 1994).
Westborough, MA 01581

</TABLE>


     * Mr. George is deemed to be an "interested" Trustee because he owns shares
of Northern  Trust  Corporation.  ** Mr. Murphy is deemed to be an  "interested"
Trustee because he owns shares of Northern Trust Corporation. *** Ms. Skinner is
deemed  to be an  "interested"  Trustee  because  her law  firm  provides  legal
services  to Northern  Trust  Corporation.  **** Mr.  Timbers is deemed to be an
"interested"  Trustee  because  he  is  an  officer,   director,   employee  and
shareholder of Northern Trust Corporation.

         Certain of the Trustees and officers and the  organizations  with which
they  are  associated  have  had  in the  past,  and  may  have  in the  future,
transactions with the Investment Advisers, PFPC (formerly FDISG), Northern Funds
Distributors,  LLC ("NFD") and their respective  affiliates.  The Trust has been
advised by such Trustees and officers that all such  transactions  have been and
are  expected to be in the  ordinary  course of  business  and the terms of such
transactions,  including all loans and loan  commitments  by such persons,  have
been and are expected to be  substantially  the same as the prevailing terms for
comparable transactions for other customers. As a result of the responsibilities
assumed by the Investment  Advisers under the Advisory Agreement with the Trust,
by Northern under its Transfer Agency Agreement,  Custodian  Agreement,  Foreign
Custody Agreement and Co-Administration  Agreement with the Trust, by PFPC under
its   Co-Administration   Agreement  with  the  Trust  and  by  PFPC  under  its
Distribution  Agreement with the Trust,  the Trust itself requires no employees.


         Each officer holds  comparable  positions with certain other investment
companies of which NFD, PFPC or an affiliate thereof is the investment  adviser,
administrator and/or distributor.

         Additionally,   the  Trust,   its  investment   adviser  and  principal
underwriter  have  adopted  codes of ethics (the  "Codes of Ethics")  under rule
17j-1 of the 1940 Act.  The Codes of Ethics  permit  personnel,  subject  to the
Codes of  Ethics  and their  provisions,  to  invest  in  securities,  including
securities that may be purchased or held by the Trust.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In addition,  the Trustees established an Audit Committee consisting of
two members  including a Chairman of the Committee.  The Audit Committee members
are Messrs. Condon and Strubel (Chairman). Each member earns a fee of $2,500 for
each meeting attended and the Chairman earns a quarterly retainer of $1,500.

         Each Trustee will hold office for an indefinite term until the earliest
of (1) the next  meeting  of  shareholders  if any,  called  for the  purpose of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust; or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

     The Trust's  officers do not  receive  fees from the Trust for  services in
such capacities,  although PFPC, of which they are also officers,  receives fees
from the Trust for administrative services.



<PAGE>



         The following table sets forth certain  information with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1999:

<TABLE>
<CAPTION>
<S>                          <C>       <C>            <C>            <C>        <C>            <C>            <C>

                                                                                                              Total
                               U.S.     Short-Intermediate  U.S.                                              Compensation
                             Government     Bond          Treasury               Intermediate   International from Fund
                             Securities   Portfolio        Index        Bond         Bond           Bond      Complex
                             Portfolio                   Portfolio     Portfolio  Portfolio      Portfolio

    Steven Timbers**         0          0              0               0        0               0             0
    William H. Springer      530        1,060          530             3,710    530             530           53,000
    Richard G. Cline         395        790            395             2,765    395             395           39,500
    Edward J. Condon, Jr.    445        890            445             3,115    445             445           44,500
    John W. English          395        790            395             2,765    395             395           39,500
    Sandra Polk Guthman      395        790            395             2,765    395             395           39,500
    Frederick T. Kelsey*     445        890            445             3,115    445             445           44,500
    Richard P. Strubel       505        1,010          505             3,535    505             505           50,500
    Wesley M. Dixon, Jr.**   0          0              0               0        0               0             22,500
    William J. Dolan, Jr.**  0          0              0               0        0               0             22,500
    Raymond   E.    George,  0          0              0               0        0               0             21,250
    Jr.**
    Michael E. Murphy**      0          0              0               0        0               0             22,500
    Mary Jacobs Skinner**    0          0              0               0        0               0             22,500

</TABLE>


     * Frederick Kelsey retired from the Board of Trustees on November 30, 1999.
** Not a Trustee of the  Northern  Institutional  Funds  during the period ended
November 30, 1999.

 Investment Advisers, Transfer Agent and Custodian

         Northern,  a wholly-owned  subsidiary of Northern Trust Corporation,  a
bank  holding  company,  is one of the nation's  leading  providers of trust and
investment  management  services.  Northern  is  one of  the  strongest  banking
organizations  in  the  United  States.  Northern  believes  it  has  built  its
organization  by serving clients with  integrity,  a commitment to quality,  and
personal  attention.  Its  stated  mission  with  respect  to all its  financial
products and services is to achieve unrivaled client satisfaction.  With respect
to such clients,  the Trust is designed to assist (i) defined  contribution plan
sponsors and their employees by offering a range of diverse  investment  options
to help comply with 404(c) regulation and may also provide educational  material
to their  employees,  (ii)  employers  who  provide  post-retirement  Employees'
Beneficiary  Associations  ("VEBA") and require  investments that respond to the
impact of Federal  regulations,  (iii)  insurance  companies with the day-to-day
management of uninvested  cash balances as well as with  longer-term  investment
needs, and (iv) charitable and not-for-profit organizations,  such as endowments
and  foundations,  demanding  investment  management  solutions that balance the
requirement  for sufficient  current  income to meet operating  expenses and the
need for capital appreciation to meet future investment objectives. NTQA, also a
wholly-owned  subsidiary  of Northern  Trust  Corporation,  serves as investment
adviser  principally  to defined  benefit  and  defined  contribution  plans and
manages  over 60 equity  and bond  commingled  and  common  trust  funds.  As of
December  31,  1999,   the   Investment   Advisers  and  their   affiliates  had
approximately  $299.1 billion in assets under  management for clients  including
public  and  private   retirement  funds,   endowments,   foundations,   trusts,
corporations, other investment companies and individuals.


<PAGE>



         Under the Advisory  Agreement with the Trust, the Investment  Advisers,
subject  to the  general  supervision  of the  Trust's  Board of  Trustees,  are
responsible  for making  investment  decisions  for each  Portfolio  and placing
purchase  and sale orders for  portfolio  transactions  of the  Portfolios.  The
Advisory  Agreement with the Trust provides that in selecting brokers or dealers
to place orders for  transactions,  the  Investment  Advisers  shall  attempt to
obtain best net price and execution or, with respect to the  International  Bond
and Intermediate Bond Portfolios, their best judgment to obtain the best overall
terms  available.  In  assessing  the  best  overall  terms  available  for  any
transaction,  the  Investment  Advisers  are to consider  all factors  they deem
relevant,  including the breadth of the market in the security, the price of the
security,  the financial  condition  and  execution  capability of the broker or
dealer, and the reasonableness of the commission,  if any, both for the specific
transaction  and on a continuing  basis.  In  evaluating  the best overall terms
available  and in  selecting  the  broker  or dealer  to  execute  a  particular
transaction,  the  Investment  Advisers may consider the  brokerage and research
services  provided  to the  Portfolios  and/or  other  accounts  over  which the
Investment Advisers or an affiliate of Northern exercise investment  discretion.
A broker or dealer providing  brokerage  and/or research  services may receive a
higher  commission  than  another  broker or dealer  would  receive for the same
transaction.  These  brokerage  and research  services may include  industry and
company analyses,  portfolio  services,  quantitative  data, market  information
systems and economic and political consulting and analytical services.

         Transactions on U.S. stock exchanges  involve the payment of negotiated
brokerage  commissions.  On exchanges on which  commissions are negotiated,  the
cost of transactions may vary among different  brokers.  Transactions on foreign
stock exchanges  involve payment for brokerage  commissions  which are generally
fixed.   Over-the-counter   issues,  including  corporate  debt  and  government
securities,  are  normally  traded on a "net" basis (i.e.,  without  commission)
through dealers, or otherwise involve  transactions  directly with the issuer of
an instrument.  With respect to  over-the-counter  transactions,  the Investment
Advisers  will  normally  deal  directly  with  dealers who make a market in the
instruments  involved except in those  circumstances where more favorable prices
and  execution  are  available  elsewhere.  The  cost of  foreign  and  domestic
securities  purchased from underwriters  includes an underwriting  commission or
concession,  and the prices at which  securities  are purchased from and sold to
dealers include a dealer's mark-up or mark-down.

         The Portfolios may participate, if and when practicable, in bidding for
the purchase of portfolio  securities  directly  from an issuer in order to take
advantage of the lower purchase  price  available to members of a bidding group.
The Portfolios will engage in this practice,  however,  only when the Investment
Advisers believe such practice to be in the Portfolios' interests.

         On occasions when the Investment  Advisers deem the purchase or sale of
a security to be in the best interests of a Portfolio as well as other fiduciary
or agency accounts  managed by them (including any other  Portfolio,  investment
company  or account  for which the  Investment  Advisers  act as  adviser),  the
Advisory  Agreement  provides  that  the  Investment  Advisers,  to  the  extent
permitted by applicable laws and regulations, may aggregate the securities to be
sold or purchased for such Portfolio with those to be sold or purchased for such
other  accounts  in order to obtain  the best net price and  execution.  In such
event,  allocation  of the  securities  so  purchased  or  sold,  as well as the
expenses incurred in the transaction, will be made by the Investment Advisers in
the  manner  they  consider  to be most  equitable  and  consistent  with  their
fiduciary  obligations  to the Portfolio and other  accounts  involved.  In some
instances,  this  procedure  may  adversely  affect  the  size  of the  position
obtainable for a Portfolio or the amount of the  securities  that are able to be
sold for a Portfolio.

         The Advisory Agreement provides that the Investment Advisers may render
similar  services to others so long as their services under such  Agreements are
not impaired thereby.  The Advisory  Agreement also provides that the Trust will
indemnify  the  Investment  Advisers  against  certain  liabilities   (including
liabilities  under the Federal  securities laws relating to untrue statements or
omissions of material fact and actions that are in accordance  with the terms of
the Agreements) or, in lieu thereof, contribute to resulting losses.

         Under its Transfer  Agency  Agreement  with the Trust,  with respect to
shares held by  Institutions,  Northern has undertaken to perform some or all of
the following  services:  (1)  establish and maintain an omnibus  account in the
name of each  Institution;  (2) process purchase orders and redemption  requests
from an Institution, and furnish confirmations and disburse redemption proceeds;
(3) act as the income  disbursing  agent of the Trust; (4) answer inquiries from
Institutions;  (5) provide periodic  statements of account to each  Institution;
(6) process and record the issuance and redemption of shares in accordance  with
instructions  from  the  Trust or its  administrator;  (7) if  required  by law,
prepare and forward to Institutions  shareholder  communications  (such as proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution  and tax  notices);  (8) preserve  all records;  and (9)
furnish  necessary  office space,  facilities and personnel.  Under the Transfer
Agency  Agreement,  with respect to shares held by investors,  Northern has also
undertaken to perform some or all of the following  services:  (1) establish and
maintain  separate  accounts in the name of the investors;  (2) process purchase
orders and redemption  requests,  and furnish  confirmations  in accordance with
applicable  law; (3) disburse  redemption  proceeds;  (4) process and record the
issuance and redemption of shares in accordance with instructions from the Trust
or its  administrator;  (5) act as  income  disbursing  agent  of the  Trust  in
accordance with the terms of the Prospectus and  instructions  from the Trust or
its  administrator;  (6) provide  periodic  statements  of  account;  (7) answer
inquiries  (including  requests for  prospectuses  and  statements of additional
information,  and assistance in the completion of new account applications) from
investors and respond to all requests for information  regarding the Trust (such
as current price, recent performance,  and yield data) and questions relating to
accounts of investors (such as possible errors in statements, and transactions);
(8) respond to and seek to resolve all  complaints of investors  with respect to
the Trust or their accounts;  (9) furnish proxy  statements and proxies,  annual
and semi-annual financial statements, and dividend, distribution and tax notices
to investors;  (10) furnish the Trust with all pertinent  Blue Sky  information;
(11) perform all required  tax  withholding;  (12)  preserve  records;  and (13)
furnish necessary office space,  facilities and personnel.  Northern may appoint
one or more sub-transfer agents in the performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement and the assumption by Northern of related  expenses,
Northern is entitled to a fee from the Trust, payable monthly, at an annual rate
of .01%,  .10% and .15% of the  average  daily net asset value of the Class A, C
and D Shares, respectively, of the Portfolios.

         Under its  Custodian  Agreement  (and in the case of the  International
Bond  Portfolio,  its Foreign Custody  Agreement)  with the Trust,  Northern (1)
holds  each  Portfolio's  cash  and  securities,  (2)  maintains  such  cash and
securities in separate accounts in the name of the Portfolio, (3) makes receipts
and  disbursements of funds on behalf of the Portfolio,  (4) receives,  delivers
and releases  securities on behalf of the  Portfolio,  (5) collects and receives
all  income,  principal  and  other  payments  in  respect  of  the  Portfolio's
investments  held  by  Northern  under  the  Agreement,  and (6)  maintains  the
accounting records of the Trust.  Northern may employ one or more subcustodians,
provided that Northern,  subject to certain monitoring  responsibilities,  shall
have no more  responsibility  or liability to the Trust on account of any action
or  omission  of any  subcustodian  so employed  than such  subcustodian  has to
Northern  and  that the  responsibility  or  liability  of the  subcustodian  to
Northern  shall  conform  to  the  resolution  of  the  Trustees  of  the  Trust
authorizing the appointment of the particular  subcustodian  (or, in the case of
foreign securities,  to the terms of any agreement entered into between Northern
and such  subcustodian  to which such  resolution  relates).  In  addition,  the
Trust's custodial arrangements provide, with respect to foreign securities, that
Northern  shall not be: (i)  responsible  for the  solvency of any  subcustodian
appointed by it with reasonable  care; (ii)  responsible for any act,  omission,
default or for the solvency of any eligible foreign securities  depository;  and
(iii) liable for any loss, damage,  cost, expense,  liability or claim resulting
from nationalization,  expropriation,  currency restrictions,  or acts of war or
terrorism or any loss where the subcustodian has otherwise exercised  reasonable
care.  Northern may also appoint  agents to carry out such of the  provisions of
the Custodian  Agreement and the Foreign Custody  Agreement as Northern may from
time to time direct, provided that the appointment of an agent shall not relieve
Northern of any of its  responsibilities  under either  Agreement.  Northern has
entered into agreements with financial  institutions and depositories located in
foreign  countries  with  respect  to the  custody  of the  Portfolios'  foreign
securities.

         As compensation  for the services  rendered to the Trust by Northern as
custodian  to the U.S.  Government  Securities,  Short-Intermediate  Bond,  U.S.
Treasury Index,  Bond and Intermediate  Bond  Portfolios,  and the assumption by
Northern of certain related  expenses,  Northern is entitled to payment from the
Trust as follows: (i) $18,000 annually for each Portfolio,  plus (ii) 1/100th of
1%  annually  of each  Portfolio's  average  daily net assets to the extent they
exceed $100  million,  plus (iii) a fixed dollar fee for each trade in portfolio
securities,  plus  (iv) a fixed  dollar  fee for  each  time  that  Northern  as
Custodian  receives  or  transmits  funds via wire,  plus (v)  reimbursement  of
expenses incurred by Northern as custodian for telephone, postage, courier fees,
office supplies and duplicating.  The fees referred to in clauses (iii) and (iv)
are subject to annual  upward  adjustments  based on  increases  in the Consumer
Price Index for All Urban  Consumers,  provided that Northern may permanently or
temporarily waive all or any portion of any upward adjustment.

         As  compensation  for the  services  rendered  to the  Trust  under the
Foreign Custody Agreement with respect to the International Bond Portfolio,  and
the assumption by Northern of certain related expenses,  Northern is entitled to
payment from the Trust as follows:  (i) $35,000  annually for the  International
Bond  Portfolio,  plus (ii)  9/100th of 1% annually of the  Portfolio's  average
daily net  assets,  plus (iii)  reimbursement  for fees  incurred by Northern as
foreign  custodian for telephone,  postage,  courier fees,  office  supplies and
duplicating.

     Northern's fees under the Custodian Agreement and Foreign Custody Agreement
are subject to reduction based on the Portfolios' daily uninvested cash balances
(if any).

         Unless  sooner  terminated,   the  Advisory  Agreement,  the  Custodian
Agreement  (or, in the case of the  International  Bond  Portfolio,  the Foreign
Custody  Agreement)  and the Transfer  Agency  Agreement will continue in effect
with respect to a particular  Portfolio  until April 30, 1999 and thereafter for
successive 12-month periods,  provided that the continuance is approved at least
annually  (1) by the vote of a majority of the  Trustees  who are not parties to
the agreement or "interested  persons" (as such term is defined in the 1940 Act)
of any party  thereto,  cast in person at a meeting  called  for the  purpose of
voting on such approval, and (2) by the Trustees or by the vote of a majority of
the  outstanding  shares  of such  Portfolio  (as  defined  below  under  "Other
Information").  Each agreement is terminable at any time without  penalty by the
Trust (by specified Trustee or shareholder action) on 60 days' written notice to
Northern  or NTQA and by  Northern  or NTQA on 60 days'  written  notice  to the
Trust.

         Prior to April 1, 1998,  Northern  served as investment  adviser to the
U.S.  Treasury Index Portfolio on the same terms as those described  above.  For
the fiscal  years or  periods  ended  November  30 as  indicated,  the amount of
advisory fees incurred by each Portfolio (after fee waivers) was as follows:


<TABLE>
<CAPTION>
<S>                                                <C>                 <C>                            <C>

                                                         1999                 1998                     1997

U.S. Government Securities Portfolio                $  171,000         $   123,385                    $  214,637
Short-Intermediate Bond Portfolio                      426,000             498,090                       428,876
U.S. Treasury Index Portfolio                          (4,000)              37,969                        43,880
Bond Portfolio                                       2,000,000           1,454,684                     1,086,221
Intermediate Bond Portfolio (1)                        139,000              55,413                         8,743
International Bond Portfolio                           143,000             185,420                       200,976
- --------------
(1)      Commenced investment operations on July 31, 1997.

         For the fiscal years or periods  ended  November 30 as  indicated,  the
Investment Advisers waived advisory fees as follows:

                                                                   1999                 1998                 1997

U.S. Government Securities Portfolio                             $  279,902       $  172,740           $  300,491
Short-Intermediate Bond Portfolio                               655,206              697,327              600,427
U.S. Treasury Index Portfolio                                    57,965               63,282               73,133
Bond Portfolio                                                2,871,713            2,036,562            1,520,709
Intermediate Bond Portfolio (1)                                 249,615               77,578               12,240
International Bond Portfolio                                     56,641               52,977               57,422

- --------------
(1)      Commenced investment operations on July 31, 1997.

         For the fiscal years or periods  ended  November 30 as  indicated,  the
amount of transfer agency fees incurred by each Portfolio was as follows:

                                                                1999                 1998                 1997
U.S. Government Securities Portfolio                          $   9,552            $   9,110              $12,116
Short-Intermediate Bond Portfolio                                19,199               21,373               17,908
U.S. Treasury Index Portfolio                                     3,342                5,260                4,802
Bond Portfolio                                                  138,510              112,476               74,971
Intermediate Bond Portfolio (1)                                   7,181                2,226                  347
International Bond Portfolio                                      2,865                2,837                2,957
- --------------
(1)      Commenced investment operations on July 31, 1997.

         For the fiscal years or periods  ended  November 30 as  indicated,  the
amount of custodian fees (and, in the case of the International  Bond Portfolio,
the foreign custodian fees) incurred by each Portfolio was as follows:

                                                                 1999                 1998                 1997

U.S. Government Securities Portfolio                                                 $21,756              $21,569
Short-Intermediate Bond Portfolio                                                     28,255               29,972
U.S. Treasury Index Portfolio                                                         21,321               21,465
Bond Portfolio                                                                        76,339               48,245
Intermediate Bond Portfolio (1)                                                       17,589                7,200
International Bond Portfolio                                                          54,780               67,525
</TABLE>

- --------------
(1)      Commenced investment operations on July 31, 1997.


         Under a Service  Mark  License  Agreement  (the  "Agreement")  with the
Trust,   Northern  Trust   Corporation   has  agreed  that  the  name  "Northern
Institutional  Funds" may be used in connection  with the Trust's  business on a
royalty-free basis.  Northern Trust Corporation has reserved to itself the right
to grant the non-exclusive right to use the name "Northern  Institutional Funds"
to any other person.  The Agreement  provides that at such time as the Agreement
is no  longer  in  effect,  the  Trust  will  cease  using  the  name  "Northern
Institutional Funds."

Portfolio Transactions

         To the extent that a Portfolio effects brokerage  transactions with NFD
or  PFPC  or any  broker/dealer  affiliated  directly  or  indirectly  with  the
Investment  Advisers,  such transactions,  including the frequency thereof,  the
receipt of any commissions payable in connection therewith, and the selection of
the  affiliated  broker/dealer  effecting  such  transactions,  will be fair and
reasonable to the shareholders of the Portfolio.

         For the fiscal  years  ended  November  30,  1999,  1998 and 1997,  all
portfolio  transactions  for the Portfolios  were executed on a principal  basis
and, therefore, no brokerage commissions were paid by the Portfolios.  Purchases
by the Portfolios from underwriters of portfolio securities,  however,  normally
include a commission or concession  paid by the issuer to the  underwriter,  and
purchases from dealers  include the spread between the dealer's cost for a given
security and the resale price of the security.

         During the fiscal year ended  November  30,  1999,  the Bond  Portfolio
acquired and sold  securities of Lehman  Brothers,  Inc. and Morgan Stanley Dean
Witter & Co.,  each a regular  broker/dealers.  At November 30,  1999,  the Bond
Portfolio   owned  the   following   amounts  of   securities   of  its  regular
broker/dealers,  as defined in Rule 10b-1 under the 1940 Act, or their  parents:
Lehman   Brothers,   Inc.,  with  an  approximate   aggregate  market  value  of
$11,316,000; and Morgan Stanley Dean Witter & Co., with an approximate aggregate
market value of $33,060,000.

         During the fiscal year ended November 30, 1999, the  Intermediate  Bond
Portfolio did not acquire or sell any  securities of its regular  broker/dealers
or their parents.  At November 30, 1999, the  Intermediate  Bond Portfolio owned
the following amounts of securities of its regular broker/dealers, as defined in
Rule 10b-1 under the 1940 Act, or their  parents:  Morgan  Stanley Dean Witter &
Co., with an approximate aggregate market value of $343,000.

         During the fiscal year ended November 30, 1999, the International  Bond
Portfolio  acquired and sold  securities of Banque  Brussels  Lambert,  Deutsche
Bank, and Credit Suisse, each a regular broker/dealer. At November 30, 1999, the
International   Bond   Portfolio   did  not  own   securities   of  its  regular
broker/dealers, as defined in Rule 10b-1 under the 1940 Act, or their parents.

         During the fiscal year ended November 30, 1999, the  Short-Intermediate
Bond  Portfolio  did acquired and sold  securities of Lehman  Brothers,  Inc., a
regular  broker/dealer.  At  November  30,  1999,  the  Short-Intermediate  Bond
Portfolio   owned  the   following   amounts  of   securities   of  its  regular
broker/dealers,  as defined in Rule 10b-1 under the 1940 Act, or their  parents:
Lehman Brothers, Inc., with an approximate aggregate market value of $5,318,000;
and  Prudential  Securities,  with an  approximate  aggregate  market  value  of
$4,461,000.

     During the  fiscal  year  ended  November  30,  1999,  the U.S.  Government
Securities Portfolio did not acquire,  sell or own any securities of its regular
broker/dealers or their parents.

     During the fiscal year ended  November 30, 1999,  the U.S.  Treasury  Index
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

Portfolio Valuation

         U.S. and foreign investments held by a Portfolio are valued at the last
quoted  sales  price on the  exchange  on which such  securities  are  primarily
traded,  except that securities  listed on an exchange in the United Kingdom are
valued at the  average of the  closing  bid and ask  prices.  If any  securities
listed on a U.S.  securities  exchange are not traded on a valuation  date, they
will be valued at the last quoted bid price.  If securities  listed on a foreign
securities  exchange are not traded on a valuation  date, they will be valued at
the most recent  quoted  trade  price.  Securities  which are traded in the U.S.
over-the-counter  markets  are valued at the last  quoted bid price.  Securities
which are traded in the foreign  over-the-counter markets are valued at the last
sales price, except that such securities traded in the United Kingdom are valued
at the average of the closing bid and ask prices. Shares of investment companies
held by the Portfolios will be valued at their respective net asset values.  Any
securities,  including restricted  securities,  for which current quotations are
not readily  available  are valued at fair value as  determined in good faith by
the  Investment  Adviser  under  the  supervision  of  the  Board  of  Trustees.
Short-term investments are valued at amortized cost which the Investment Adviser
has  determined,  pursuant to Board  authorization,  approximates  market value.
Securities may be valued on the basis of prices provided by independent  pricing
services  when such prices are believed to reflect the fair market value of such
securities.

Co-Administrators and Distributor

         Effective  May 1,  1999,  Northern  and  PFPC  (formerly  FDISG),  4400
Computer Drive,  Westborough,  Massachusetts 01581, act as co-administrators for
the Portfolios under a  Co-Administration  Agreement with the Trust.  Subject to
the general  supervision  of the Trust's  Board of  Trustees,  Northern and PFPC
(formerly FDISG) (the "Co-Administrators") provide supervision of all aspects of
the Trust's  non-investment  advisory  operations and perform various  corporate
secretarial,  treasury and blue sky services,  including but not limited to: (a)
maintaining  office facilities and furnishing  corporate officers for the Trust;
(b) furnishing data processing  services,  clerical services,  and executive and
administrative  services  and  standard  stationery  and  office  supplies;  (c)
performing  all  functions  ordinarily  performed  by the office of a  corporate
treasurer,  and  furnishing  the services  and  facilities  ordinarily  incident
thereto,  such as expense  accrual  monitoring and payment of the Trust's bills,
preparing  monthly  reconciliation  of the  Trust's  expense  records,  updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to  their  customers  who are the  beneficial  owners  of  shares,  pursuant  to
servicing agreements between the Trust and such Servicing Agents.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators are entitled to a fee from each Portfolio,  computed daily and
payable  monthly,  at an annual rate of .15% of the average  daily net assets of
the  International  Bond Portfolio,  and .10% of the average daily net assets of
each other Portfolio.  The  Co-Administrators  will reimburse each Portfolio for
its expenses (including  administration  fees payable to the  Co-Administrators,
but  excluding  advisory  fees,   transfer  agency  fees,   servicing  fees  and
extraordinary  expenses)  which  exceed  on an  annualized  basis  .25%  of  the
International  Bond Portfolio's  average daily net assets and .10% of each other
Portfolio's average daily net assets.
         For the fiscal year ended  November  30,  1999,  the  Co-Administrators
received  fees  under the  Co-Administration  Agreement  with the  Trust  (after
waivers) in the amount of:

         U.S. Government Securities Portfolio               $    20,533
         Short-Intermediate Bond Portfolio                  $    89,280
         U.S. Treasury Index Portfolio                      $   (37,426)
         Bond Portfolio                                     $  537,430
         Intermediate Bond Portfolio                        $      7,380
         International Bond Portfolio                       $   (36,059)


         Prior to May 1, 1999, Goldman,  Sachs & Co. ("Goldman Sachs"), 85 Broad
Street, New York, New York 10004, acted as the Trust's administrator pursuant to
an  administration  agreement  substantially  similar  to the  Co-Administration
Agreement  currently in effect with Northern and PFPC (formerly FDISG).  For the
fiscal years or periods ended  November 30 as indicated,  Goldman Sachs received
fees under its  administration  agreement  with the Trust (after fee waivers) in
the amount of:

<TABLE>
<CAPTION>
<S>                                                      <C>                                <C>                      <C>

                                                               December 1, 1998
                                                         through April 30, 1999                   1998                  1997

U.S. Government Securities Portfolio                                   $  4,942              $  49,354              $ 85,432
Short-Intermediate Bond Portfolio                                        26,176                199,235               171,514
U.S. Treasury Index Portfolio                                          (13,756)                 25,313                29,247
Bond Portfolio                                                          174,149                581,869               434,500
Intermediate Bond Portfolio (1)                                          11,043                 22,165                 3,470
International Bond Portfolio                                           (17,685)                 39,733                36,801
- --------------
(1)      Commenced investment operations on July 31, 1997.

         Prior to May 1,  1997,  Goldman  Sachs  voluntarily  agreed  to waive a
portion of its administration fee for each Portfolio then in existence resulting
in an effective fee of .10% of the average daily net assets for each  Portfolio.
The effect of these waivers by Goldman Sachs was to reduce  administration  fees
by the following  amounts for the fiscal years or periods  ended  November 30 as
indicated:

                                                    December 1, 1998 through
                                                               April 30, 1999                 1998                      1997

U.S. Government Securities Portfolio                                                            $0                   $52,820
Short-Intermediate Bond Portfolio                                                                0                    72,454
U.S. Treasury Index Portfolio                                                                    0                    17,382
Bond Portfolio                                                                                   0                    94,064
Intermediate Bond Portfolio (1)                                                                  0                       N/A
International Bond Portfolio                                                                     0                    18,779
- --------------
(1)      Commenced investment operations on July 31, 1997.

</TABLE>


         In addition,  pursuant to an undertaking that commenced August 1, 1992,
Goldman   Sachs  agreed  that,   if  its   administration   fees  (less  expense
reimbursements  paid by Goldman  Sachs to the Trust and less  certain  marketing
expenses paid by Goldman  Sachs)  exceed a specified  amount ($1 million for the
Trust's  first twelve  investment  portfolios  plus $50,000 for each  additional
portfolio)  during the current fiscal year,  Goldman Sachs would waive a portion
of its administration  fees during the following fiscal year. There have been no
waivers pursuant to this agreement during the last three fiscal years.

         Goldman Sachs had agreed each year to reimburse  each Portfolio for its
expenses  (including  fees  payable  to  Goldman  Sachs  as  administrator,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceeded on an annualized basis .25% of the  International  Bond
Portfolio's  average daily net assets and .10% of each other Portfolio's average
daily net assets.  Prior to May 1, 1997,  this  undertaking  was voluntary  with
respect to the Portfolios.  As of May 1, 1997, this  undertaking was contractual
with respect to all Portfolios.  The effect of these  reimbursements  by Goldman
Sachs for the fiscal years or periods  ended  November 30 as  indicated  were to
reduce the expenses of each Portfolio by:


<TABLE>
<CAPTION>
<S>                                                                  <C>                     <C>

                                                                        1998                   1997

U.S. Government Securities Portfolio                                 $  72,267               $  70,879
Short-Intermediate Bond Portfolio                                      103,011                 102,005
U.S. Treasury Index Portfolio                                           66,821                  71,652
Bond Portfolio                                                         222,213                 165,969
Intermediate Bond Portfolio (1)                                         83,211                  54,096
International Bond Portfolio                                            95,507                  82,249
- --------------
(1)      Commenced investment operations on July 31, 1997.
</TABLE>



         Unless  sooner  terminated,   the  Co-Administration   Agreement  among
Northern,  PFPC and the Trust will continue in effect until April 30, 2001,  and
thereafter  for  successive  one-year  terms  with  respect  to each  Portfolio,
provided that the Agreement is approved annually (1) by the Board of Trustees or
(2) by the vote of a majority of the  outstanding  shares of such  Portfolio (as
defined  below under  "Other  Information"),  provided  that in either event the
continuance  is also  approved by a majority of the Trustees who are not parties
to the Agreement and who are not interested persons (as defined in the 1940 Act)
of any party thereto, by vote cast in person at a meeting called for the purpose
of voting on such approval. The Co-Administration Agreement is terminable at any
time  after  April 30,  2001  without  penalty  by the Trust on at least 60 days
written notice to the Co-Administrators. Each Co-Administrator may terminate the
Co-Administration  Agreement  with respect to itself at any time after April 30,
2001  without  penalty on at least 60 days  written  notice to the Trust and the
other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30, 2001 in the event that the Trust or its shareholders incur damages in excess
of $100,000 as a result of the willful  misfeasance,  bad faith or negligence of
the  Co-Administrators,  or the  reckless  disregard  of their  duties under the
Agreement. The Trust may also terminate the Co-Administration Agreement prior to
April 30, 2001 in the event that the  Co-Administrators  fail to meet one of the
performance standards set forth in the Agreement.

         The Trust has  entered  into a  Distribution  Agreement  with NFD under
which NFD, as agent,  sells shares of each Portfolio on a continuous  basis. NFD
pays the cost of printing and  distributing  prospectuses to persons who are not
shareholders of the Trust (excluding  preparation and typesetting  expenses) and
of certain  other  distribution  efforts.  NFD is a  wholly-owned  subsidiary of
Provident   Distributors,   Inc.  ("PDI").  PDI,  based  in  West  Conshohocken,
Pennsylvania, is an independently owned and operated broker-dealer.  Between May
1, 1999 and November 30, 1999, First Data  Distributors,  Inc. ("FDDI") acted as
the Trust's  distributor  pursuant  to a  distribution  agreement  substantially
similar  to  the  Distribution  Agreement  currently  in  effect  with  NFD.  No
compensation  is  payable  by the Trust to NFD for such  distribution  services.
Prior to May 1, 1999, Goldman Sachs acted as the Trust's distributor pursuant to
a distribution  agreement  substantially  similar to the Distribution  Agreement
currently in effect with NFD.

         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust  will  indemnify  NFD  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by NFD, or those resulting from the willful misfeasance, bad faith or negligence
of NFD, or NFD's breach of confidentiality.

         Under a Service Mark License  Agreement (the "License  Agreement") with
NFD,  Northern Trust  Corporation  agrees that the name "Northern  Institutional
Funds" may be used in connection with Northern  Institutional Funds' business on
a  royalty-free  basis.  Northern Trust  Corporation  has reserved to itself the
right to grant the non-exclusive right to use the name ("Northern  Institutional
Funds") to any other person. The License Agreement provides that at such time as
the  License  Agreement  is no longer in effect  NFD will  cease  using the name
"Northern Institutional Funds."

 Shareholder Servicing Plan

         As stated in the  Portfolios'  Prospectus,  Servicing  Agents may enter
into servicing agreements with the Trust under which they provide (or arrange to
have  provided)  support  services to their  Customers  or other  investors  who
beneficially own such shares in consideration of the Portfolios'  payment of not
more than .15% and .25% (on an annualized  basis) of the average daily net asset
value of the  Class C and D  Shares,  respectively,  beneficially  owned by such
Customers or investors.

     For the  fiscal  years or  periods  ended  November  30 as  indicated,  the
aggregate  amount of the Shareholder  Service Fee incurred by each class of each
Portfolio then
in existence was as follows:

<TABLE>
<CAPTION>
<S>      <C>                                                  <C>                  <C>            <C>


                                                              1999                  1998             1997

U.S. Government Securities Portfolio
         Class C (1)                                              $  560             $ 5,132      $ 5,225
         Class D                                                   2,175               1,955          710
Short-Intermediate Bond Portfolio
         Class D                                                     852               2,584        1,349
U.S. Treasury Index Portfolio
         Class C (2)                                                 251                  25          N/A
         Class D                                                   1,558               4,846        3,353
Bond Portfolio
         Class C                                                  90,790              86,693       51,720
         Class D                                                   4,179               4,050          887
Intermediate Bond Portfolio
         Class D (3)                                                  86                  17          N/A
International Bond Portfolio
         Class D                                                      59                 334          154
</TABLE>

- -----------------
(1)      Class C Shares were issued on December 29, 1995.
(2)      Class C Shares were issued on October 7, 1998.
(3)      Class D Shares were issued on October 5, 1998.

         Services  provided by or arranged  to be provided by  Servicing  Agents
under their servicing  agreements may include:  (1) establishing and maintaining
separate  account  records  of  Customers  or  other  investors;  (2)  providing
Customers or other  investors with a service that invests their assets in shares
of certain  classes  pursuant to specific or  pre-authorized  instructions,  and
assistance  with  new  account  applications;  (3)  aggregating  and  processing
purchase and redemption requests for shares of certain classes from Customers or
other investors,  and placing  purchase and redemption  orders with the Transfer
Agent;  (4) issuing  confirmations to Customers or other investors in accordance
with  applicable  law;  (5)  arranging  for the  timely  transmission  of  funds
representing  the net purchase  price or  redemption  proceeds;  (6)  processing
dividend  payments on behalf of  Customers  or other  investors;  (7)  providing
information periodically to Customers or other investors showing their positions
in shares;  (8)  responding to Customer or other investor  inquiries  (including
requests for prospectuses), and complaints relating to the services performed by
the  Servicing  Agents;  (9) acting as liaison with respect to all inquiries and
complaints  from Customers and other investors  relating to errors  committed by
the Trust or its  agents,  and  other  matters  pertaining  to the  Trust;  (10)
providing or arranging for another person to provide  subaccounting with respect
to shares of certain classes beneficially owned by Customers or other investors;
(11) if required by law,  forwarding  shareholder  communications from the Trust
(such  as  proxy  statements  and  proxies,   shareholder  reports,  annual  and
semi-annual financial statements and dividend,  distribution and tax notices) to
Customers and other investors;  (12) providing such office space, facilities and
personnel  as may be  required to perform  their  services  under the  servicing
agreements;  (13) maintaining  appropriate  management reporting and statistical
information;  (14) paying expenses related to the preparation of educational and
other  explanatory  materials in  connection  with the  development  of investor
services; (15) developing and monitoring investment programs; and (16) providing
such other similar  services as the Trust may  reasonably  request to the extent
the Servicing Agents are permitted to do so under applicable statutes, rules and
regulations.

         The Trust's  agreements  with  Servicing  Agents are governed by a Plan
(called the "Shareholder Servicing Plan") which has been adopted by the Board of
Trustees. Pursuant to the Shareholder Servicing Plan, the Board of Trustees will
review,  at least quarterly,  a written report of the amounts expended under the
Trust's  agreements  with  Servicing  Agents  and the  purposes  for  which  the
expenditures were made. In addition, the arrangements with Servicing Agents must
be  approved  annually  by a  majority  of the Board of  Trustees,  including  a
majority of the  Trustees  who are not  "interested  persons"  of the Trust,  as
defined in the 1940 Act,  and have no direct or indirect  financial  interest in
such arrangements.

         The Board of Trustees  has  approved the  arrangements  with  Servicing
Agents based on information  provided by the Trust's  service  contractors  that
there  is a  reasonable  likelihood  that  the  arrangements  will  benefit  the
Portfolios  and  their   shareholders   by  affording  the  Portfolios   greater
flexibility  in connection  with the servicing of the accounts of the beneficial
owners of their shares in an efficient manner.

 Counsel and Auditors

         Drinker Biddle & Reath LLP, with offices at One Logan Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.

         ______________,  independent  auditors,  233 S. Wacker Drive,  Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit services, _____________ reviews the Trust's Federal and state tax returns,
and provides  consultation  and assistance on accounting,  internal  control and
related matters.

 In-Kind Purchases and Redemptions

         Payment for shares of a Portfolio  may, in the  discretion of Northern,
be made in the form of  securities  that  are  permissible  investments  for the
Portfolio as described in the  Prospectus.  For further  information  about this
form of payment,  contact  Northern.  In connection  with an in-kind  securities
payment,  a Portfolio will require,  among other things,  that the securities be
valued on the day of purchase in accordance with the pricing methods used by the
Portfolio and that the Portfolio  receive  satisfactory  assurances that it will
have  good and  marketable  title to the  securities  received  by it;  that the
securities  be in proper form for transfer to the  Portfolio;  and that adequate
information be provided  concerning the basis and other tax matters  relating to
the securities.

         Although each  Portfolio  generally  will redeem  shares in cash,  each
Portfolio  reserves the right to pay  redemptions by a  distribution  in kind of
securities (instead of cash) from such Portfolio.  The securities distributed in
kind would be readily  marketable and would be valued for this purpose using the
same method  employed in calculating  the Portfolio's net asset value per share.
If a shareholder  receives  redemption  proceeds in kind, the shareholder should
expect  to incur  transaction  costs  upon  the  disposition  of the  securities
received in the redemption.

PERFORMANCE INFORMATION

         The  performance of a class of shares of a Portfolio may be compared to
those of other  mutual  funds with similar  investment  objectives  and to bond,
stock and other relevant indices or to rankings prepared by independent services
or other  financial or industry  publications  that monitor the  performance  of
mutual funds. For example,  the performance of a class of shares may be compared
to data prepared by Lipper Analytical Services, Inc. or other independent mutual
fund reporting services. In addition, the performance of a class may be compared
to the  Lehman  Brothers  Government/Corporate  Bond  Index (or its  components,
including the Treasury  Bond Index),  the Lehman  Mutual Fund  Intermediate  Tax
Exempt Index, S&P 500 Index, S&P/Barra Growth Index, the Russell 2000 Index, the
Europe and  Australia  Far East Equity Index ("EAFE  Index") or other  unmanaged
stock and bond  indices,  including,  but not limited to, the Merrill  Lynch 1-5
Year Government Bond Index, the Merrill Lynch 1-5 Year Corporate/Government Bond
Index,  the 3-month LIBOR Index,  the 91-day  Treasury Bill Rate,  the Composite
Index,  the J.P.  Morgan  Non-U.S.  Government  Bond  Index,  and the Dow  Jones
Industrial Average, a recognized unmanaged index of common stocks of 30 industry
companies listed on the New York Stock Exchange. Performance data as reported in
national  financial  publications such as Money Magazine,  Morningstar,  Forbes,
Barron's,  The Wall Street Journal and The New York Times, or in publications of
a local or regional  nature,  may also be used in comparing the performance of a
class of shares of a Portfolio.

         The Portfolios  calculate  their total returns for each class of shares
separately  on an "average  annual total  return"  basis for various  periods as
permitted  under the rules of the SEC.  Average annual total return reflects the
average annual percentage change in value of an investment in the class over the
measuring period.  Total returns for each class of shares may also be calculated
on an "aggregate total return" basis for various periods. Aggregate total return
reflects the total percentage  change in value over the measuring  period.  Both
methods of calculating  total return reflect  changes in the price of the shares
and  assume  that any  dividends  and  capital  gain  distributions  made by the
Portfolio with respect to a class during the period are reinvested in the shares
of that class. When considering  average total return figures for periods longer
than one year,  it is  important to note that the annual total return of a class
for any one year in the period might have been more or less than the average for
the entire period. The Portfolios may also advertise from time to time the total
return of one or more  classes of shares on a  year-by-year  or other  basis for
various specified periods by means of quotations, charts, graphs or schedules.

         Each Portfolio that  advertises an "average  annual total return" for a
class  of  shares  computes  such  return  by  determining  the  average  annual
compounded  rate of return  during  specified  periods  that equates the initial
amount invested to the ending  redeemable value of such investment  according to
the following formula:

                                       P (1+T)to the power of n  = ERV

1
         Where:           T =         average annual total return;

                          ERV         =  ending  redeemable  value at the end of
                                      the   applicable   period  (or  fractional
                                      portion thereof) of a hypothetical  $1,000
                                      payment made at the  beginning of the 1, 5
                                      or 10 year (or other) period;

                          P =      hypothetical initial payment of $1,000; and


     n = period covered by the computation, expressed in terms of years.

         Each Portfolio that advertises an "aggregate  total return" for a class
of shares computes such return by determining the aggregate  compounded rates of
return during specified periods that likewise equate the initial amount invested
to the ending  redeemable value of such investment.  The formula for calculating
aggregate total return is as follows:

                                              T = [(ERV/P] - 1

         The  calculations  set  forth  below  are  made  assuming  that (1) all
dividends and capital gain  distributions  are  reinvested  on the  reinvestment
dates at the price  per  share  existing  on the  reinvestment  date and (2) all
recurring  fees charged to all  shareholder  accounts are  included.  The ending
redeemable  value  (variable  "ERV" in the  formula) is  determined  by assuming
complete  redemption  of the  hypothetical  investment  after  deduction  of all
nonrecurring charges at the end of the measuring period.

         The average  annual total  returns and  aggregate  total  returns shown
below for the  Short-Intermediate  Bond, U.S. Treasury Index and Bond Portfolios
include,  for periods prior to the  commencement of the Portfolios'  operations,
the performance of predecessor  collective  funds adjusted to reflect the higher
estimated fees and expenses applicable to such Portfolios' Class A Shares at the
time of their  inception.  Although all such  predecessor  collective funds were
managed  by  Northern  for the  periods  stated  in a  manner  and  pursuant  to
investment  objectives  that were  equivalent  in all  material  respects to the
management  and  investment  objectives of the  corresponding  Portfolios,  such
predecessor collective funds were not registered under the 1940 Act and were not
subject to certain investment  restrictions imposed by the 1940 Act. If they had
been  registered  under  the 1940 Act,  performance  might  have been  adversely
affected. The average annual total returns and aggregate total returns shown for
the  Portfolios  for their Class C and/or Class D Shares also  include,  for the
periods  prior  to  the  inception  of  such  classes,  the  performance  of the
Portfolios' Class A Shares. Because the fees and expenses of Class C and Class D
Shares are,  respectively,  0.24% and 0.39% higher than those of Class A Shares,
actual  performance  for periods  prior to the  inception of Class C and Class D
Shares  would have been lower if such  higher fees and  expenses  had been taken
into account.



         Following commencement of operations of the Portfolios, prior to May 1,
1999, Goldman Sachs reimbursed expenses to the Portfolios and voluntarily agreed
to reduce a portion of its administration fee for each Portfolio pursuant to the
undertaking    described   above   under   "Additional   Trust   Information   -
Co-Administrators  and Distributor" and "- Investment  Advisers,  Transfer Agent
and Custodian,"  and Northern  waived a portion of its investment  advisory fees
with respect to the  Portfolios.  The average annual total returns and aggregate
total  returns of each  Portfolio  with  respect to Class A, Class C and Class D
Shares,  as  applicable,  are shown below with and without  such fee waivers and
expense reimbursements.





<PAGE>





<TABLE>
<CAPTION>
<S>                            <C>       <C>         <C>           <C>          <C>            <C>      <C>           <C>

For Periods Ended November 30, 1999

                               Average Annual Total Returns (%)                 Aggregate Total Returns (%)

                                                                   Since                                               Since
                               1 Year      5 Year     10 year      Inception     1 Year         5 Year   10 Year      Inception
Bond1
Class A
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class C
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class D
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Intermediate Bond2
Class A
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class D
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Short-Intermediate Bond3
Class A
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class D
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

U.S. Treasury Index4
Class A
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class C
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class D
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

U.S. Government Securities5
Class A
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class C
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class D
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

International Bond6
Class A
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

Class D
  With fee waivers and
  Expense reimbursements

  Without fee waivers and
  Expense reimbursements

</TABLE>

- ----------------------
1.       For Class A, C and D Shares,  performance  information prior to January
         11,  1993   (commencement  of  Portfolio)  is  that  of  a  predecessor
         collective fund. For Class C and D Shares, performance information from
         January 11, 1993 to July 3, 1995  (commencement  of Class C Shares) and
         September 14, 1994 (commencement of Class D Shares),  respectively,  is
         that of Class A Shares.  Because  the fees and  expenses of Class C and
         Class D Shares are .24% and .39%,  respectively,  higher  than those of
         Class A Shares,  actual performance would have been lower had such fees
         and expenses been taken into account.  The predecessor  collective fund
         has been  managed in a manner and  pursuant  to  investment  objectives
         equivalent in all material  respects to the  management  and investment
         objective  of the  Portfolio  for the periods  shown.  The  performance
         information of the  predecessor  collective fund is adjusted to reflect
         the higher fees and expenses  applicable  to Class A Shares at the time
         of their inception.

2.       For  Class D Shares,  performance  information  from  August 1, 1997 to
         October  5, 1998  (commencement  of Class D Shares)  is that of Class A
         Shares.  Class A Shares commenced operations on August 1, 1997. Because
         the fees and  expenses  of Class D Shares are .39% higher than those of
         Class A Shares,  actual  performance  would  have  been  lower had such
         higher fees and expenses been taken into account.

3.       For Class A and D Shares,  performance information prior to January 11,
         1993  (commencement  of Portfolio) is that of a predecessor  collective
         fund. For Class D Shares, performance information from January 11, 1993
         to September 14, 1994 (commencement of Class D Shares) is that of Class
         A Shares.  Because  the fees and  expenses  of Class D Shares  are .39%
         higher than those of Class A Shares, actual performance would have been
         lower had such higher fees and expenses  been taken into  account.  The
         predecessor  collective  fund has been managed in a manner and pursuant
         to investment  objectives  equivalent  in all material  respects to the
         management  and  investment  objective of the Portfolio for the periods
         shown. The performance  information of the predecessor  collective fund
         is adjusted to reflect the higher fees and expenses applicable to Class
         A Shares at the time of their inception.

4.       For Class A, C and D Shares,  performance  information prior to January
         11,  1993   (commencement  of  Portfolio)  is  that  of  a  predecessor
         collective fund. For Class C and D Shares, performance information from
         January  11, 1993 to October 7, 1998  (commencement  of Class C Shares)
         and November 16, 1994  (commencement of Class D Shares),  respectively,
         is that of Class A Shares. Because the fees and expenses of Class C and
         Class D Shares are .24% and .39%,  respectively,  higher  than those of
         Class A Shares,  actual  performance  would  have  been  lower had such
         higher  fees  and  expenses  been  taken  into   account.   Performance
         information of the predecessor collective fund is shown from January 1,
         1987,  the date from which the  predecessor  fund has been managed in a
         manner and pursuant to investment objectives equivalent in all material
         respects to the management  and investment  objective of the Portfolio.
         The  performance  information  of the  predecessor  collective  fund is
         adjusted to reflect the higher fees and expenses  applicable to Class A
         Shares at the time of their inception.

5.       For Class C and D Shares, performance information prior to December 29,
         1995  (commencement  of  Class  C  Shares),   and  September  15,  1994
         (commencement  of  Class D  Shares),  respectively,  is that of Class A
         Shares. Class A Shares commenced operations April 5, 1993. Because fees
         and  expenses of Class C and D Shares are .24% and .39%,  respectively,
         higher than those of Class A Shares, actual performance would have been
         lower had such higher fees and expenses been taken into account.

6.       For Class D Shares,  performance information prior to November 20, 1995
         (commencement  of Class D Shares)  is that of Class A  Shares.  Class A
         Shares  commenced  operations  on March 28, 1994.  Because the fees and
         expenses  of  Class D  Shares  are .39%  higher  than  those of Class A
         Shares,  actual  performance would have been lower had such higher fees
         and expenses been taken into account.



<PAGE>


                                                   B-77
         The yield of a class of shares in the  Portfolios is computed  based on
the net income of such class during a 30-day (or one month) period (which period
will be identified in connection  with the  particular  yield  quotation).  More
specifically,  a Portfolio's yield for a class of shares is computed by dividing
the per share net income for the class during a 30-day (or one month)  period by
the net asset value per share on the last day of the period and  annualizing the
result on a semi-annual basis.

     The Portfolios' 30-day (or one month) standard yield is calculated for each
class of the Portfolios in accordance with the method  prescribed by the SEC for
mutual funds:

                               Yield = 2[{(a-b/c-d) + 1}to the power of 6 - 1

2
              Where:
a = dividends and interest earned by a Portfolio during the period;

b = expenses accrued for the period (net of reimbursements);

                               c     =   average    daily   number   of   shares
                                     outstanding  during the period  entitled to
                                     receive dividends; and

                               d = net asset  value per share on the last day of
the period.

     For the 30-day period ended November 30, 1999,  the  annualized  yields for
the Class A, Class C and Class D Shares of the Portfolios were as follows:

                                                                30-Day Yield
U.S. Government Securities
  Portfolio
          Class A
          Class C
          Class D

Short-Intermediate Bond
  Portfolio
          Class A
          Class C
          Class D

U.S. Treasury Index Portfolio
          Class A
          Class C
          Class D

Bond Portfolio
          Class A
          Class C
          Class D

Intermediate Bond Portfolio
          Class A
          Class C
          Class D

International Bond Portfolio
          Class A
          Class C
          Class D

         The information  set forth in the foregoing table reflects  certain fee
reductions and expense limitations. See "Investment Advisers, Transfer Agent and
Custodian" and  "Co-Administrators  and  Distributor"  under  "Additional  Trust
Information." In the absence of such fee reductions and expense limitations, the
annualized  30-day yields of each Portfolio with respect to Class A, Class C and
Class D Shares would have been as follows:

                                                                30-Day Yield

U.S. Government Securities
  Portfolio
          Class A
          Class C
          Class D

Short-Intermediate Bond Portfolio
          Class A
          Class C
          Class D

U.S. Treasury Index Portfolio
          Class A
          Class C
          Class D

Bond Portfolio
          Class A
          Class C
          Class D

Intermediate Bond Portfolio
          Class A
          Class C
          Class D

International Bond Portfolio
          Class A
          Class C
          Class D

         Because  of the  different  servicing  fees and  transfer  agency  fees
payable  with  respect  to Class A, C and D Shares in a  Portfolio,  performance
quotations  for shares of Class C and D of the Portfolio  will be lower than the
quotations for Class A Shares of the Portfolio, which will not bear any fees for
shareholder support services and will bear minimal transfer agency fees.

         The  performance  of each class of shares of the Portfolios is based on
historical  earnings,  will  fluctuate  and is not  intended to indicate  future
performance.  The  investment  return and principal  value of an investment in a
class will  fluctuate  so that when  redeemed,  shares may be worth more or less
than their original cost.  Performance  information  may not provide a basis for
comparison with bank deposits and other  investments which provide a fixed yield
for a stated  period of time.  Total  return data should also be  considered  in
light of the risks associated with a Portfolio's composition, quality, maturity,
operating  expenses  and market  conditions.  Any fees  charged by  Institutions
directly  to  their  Customer  accounts  in  connection  with  investments  in a
Portfolio will not be included in calculations of performance information.

TAXES

         The  following   summarizes   certain   additional  tax  considerations
generally affecting the Portfolios and their shareholders that are not described
in the  Portfolios'  Prospectus.  No  attempt  is made  to  present  a  detailed
explanation  of the tax treatment of the Portfolios or their  shareholders,  and
the  discussion  here and in the  applicable  Prospectus  is not  intended  as a
substitute for careful tax planning.  Potential  investors  should consult their
tax advisers with specific reference to their own tax situations.

General

         Each  Portfolio  will  elect  to be  taxed  separately  as a  regulated
investment company (a "RIC"). To qualify as a RIC, each Portfolio generally must
distribute  an amount equal to at least 90% of its  investment  company  taxable
income (net investment income and the excess of net short-term capital gain over
net  long-term  capital  loss),  if  any,  for  each  year  (the   "Distribution
Requirement") and satisfy certain other requirements. Each Portfolio must derive
at least 90% of its gross income from dividends, interest, certain payments with
respect  to  securities  loans and gains from the sale or other  disposition  of
stock or securities  or foreign  currencies,  or from other income  derived with
respect to its business of investing in such stock,  securities  or  currencies.
Also, at the close of each quarter of the value of each Portfolio's  assets must
consist of cash and cash items, U.S. Government securities,  securities of other
RICs,  and  securities  of other  issuers  (as to which  the  Portfolio  has not
invested  more than 5% of the value of its total  assets in  securities  of such
issuer  and as to  which  the  Portfolio  does  not  hold  more  than 10% of the
outstanding voting securities of such issuer), and no more than 25% of the value
of each  Portfolio's  total assets may be invested in the  securities of any one
issuer (other than U.S. Government  securities and securities of other regulated
investment  companies),  or in two or more issuers which such Portfolio controls
and  which  are  engaged  in the same or  similar  trades  or  businesses.  Each
Portfolio intends to comply with these RIC requirements.


         If for any taxable year any Portfolio were not to qualify as a RIC, all
of its taxable income would be subject to tax at regular corporate rates without
any  deduction  for   distributions   to   shareholders.   In  such  event,  all
distributions  by the  Portfolio  would be taxable to  shareholders  as ordinary
income to the extent of the  Portfolio's  current and  accumulated  earnings and
profits, and would be eligible for the dividends-received  deduction in the case
of corporate shareholders.

         The Internal Revenue Code imposes a nondeductible 4% excise tax on RICs
that fail  currently to distribute an amount equal to specified  percentages  of
their  ordinary  taxable  income and capital gain net income  (excess of capital
gains  over  capital  losses).   Each  Portfolio   intends  to  make  sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar year to avoid  liability for this excise tax. Each
Portfolio also intends to make sufficient  distributions or deemed distributions
each year to avoid  liability for corporate  income tax. If a Portfolio  were to
fail to make sufficient  distributions,  it could be liable for corporate income
tax and for excise tax.

         The Trust will be  required in certain  cases to withhold  and remit to
the  United  States  Treasury  31% of  taxable  dividends  or 31% of gross  sale
proceeds paid to any  shareholder  (i) who has provided  either an incorrect tax
identification  number  or no  number  at all,  (ii) who is  subject  to  backup
withholding  by the  Internal  Revenue  Service for prior  failure to report the
receipt of taxable interest or dividend income properly, or (iii) who has failed
to certify to the  Trust,  when  required  to do so,  that he is not  subject to
backup withholding or that he is an "exempt recipient."

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on  distributions  by a
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
A  foreign  shareholder  generally  will  not  be  subject  to  U.S.  income  or
withholding  tax in respect of proceeds from or gain on the redemption of shares
or in  respect  of capital  gain  dividends  (i.e.,  dividends  attributable  to
long-term  capital gains of a Portfolio),  provided such  shareholder  submits a
statement,  signed under penalties of perjury,  attesting to such  shareholder's
exempt status. Different tax consequences apply to a foreign shareholder engaged
in a U.S.  trade or  business  or present in the U.S.  for 183 days or more in a
year. Foreign  shareholders should consult their tax advisers regarding the U.S.
and foreign tax consequences of investing in a Portfolio.

Conclusion

         The foregoing  discussion is based on Federal tax laws and  regulations
which  are in  effect on the date of this  Additional  Statement.  Such laws and
regulations may be changed by legislative or  administrative  action. No attempt
is made to present a detailed  explanation of the tax treatment of the Portfolio
or its  shareholders,  and the  discussion  here  and in the  Prospectus  is not
intended as a substitute for careful tax planning.  Shareholders  are advised to
consult their tax advisers with specific  reference to their own tax  situation,
including the application of state and local taxes.

         Although each Portfolio  expects to qualify as a RIC and to be relieved
of all or  substantially  all Federal  taxes,  depending  upon the extent of its
activities  in states and  localities  in which its offices are  maintained,  in
which its  agents  or  independent  contractors  are  located  or in which it is
otherwise deemed to be conducting business, each Portfolio may be subject to the
tax laws of such states or localities.

DESCRIPTION OF SHARES

         The Trust  Agreement  permits the Trust's Board of Trustees to issue an
unlimited number of full and fractional shares of beneficial  interest of one or
more  separate  series   representing   interests  in  one  or  more  investment
portfolios.  The Trustees may hereafter create series in addition to the Trust's
twenty-one existing series,  which represent interests in the Trust's twenty-one
respective portfolios,  six of which are discussed in this Additional Statement.
The Trust Agreement also permits the Board of Trustees to classify or reclassify
any unissued  shares into classes within a series.  Pursuant to such  authority,
the Trustees have  authorized  the issuance of an unlimited  number of shares of
beneficial  interest in three separate  classes of shares in each of the Trust's
non-money market portfolios: Class A, C and D Shares.

         Under the terms of the Trust Agreement, each share of each Portfolio is
without par value,  represents an equal proportionate interest in the particular
Portfolio  with  each  other  share of its  class in the same  Portfolio  and is
entitled to such dividends and  distributions out of the income belonging to the
Portfolio as are declared by the Trustees.  Upon any liquidation of a Portfolio,
shareholders  of each class of a Portfolio are entitled to share pro rata in the
net assets  belonging to that class  available for  distribution.  Shares do not
have any preemptive or conversion  rights.  The right of redemption is described
under "About Your  Account -- Selling  Shares" in the  Prospectus.  In addition,
pursuant  to the terms of the 1940 Act,  the  right of a  shareholder  to redeem
shares and the date of payment by a  Portfolio  may be  suspended  for more than
seven  days (a) for any  period  during  which the New York  Stock  Exchange  is
closed, other than the customary weekends or holidays, or trading in the markets
the Portfolio  normally utilizes is closed or is restricted as determined by the
SEC, (b) during any emergency, as determined by the SEC, as a result of which it
is not reasonably  practicable for the Portfolio to dispose of instruments owned
by it or fairly to determine the value of its net assets,  or (c) for such other
period as the SEC may by order permit for the protection of the  shareholders of
the  Portfolio.  The Trust may also suspend or postpone the  recordation  of the
transfer of its shares upon the  occurrence of any of the foregoing  conditions.
In addition, shares of each Portfolio are redeemable at the unilateral option of
the Trust if the Trustees  determine in their sole discretion that failure to so
redeem  may  have  material  adverse  consequences  to the  shareholders  of the
Portfolio. Shares when issued as described in the Prospectus are validly issued,
fully  paid and  nonassessable,  except as stated  below.  In the  interests  of
economy and convenience,  certificates representing shares of the Portfolios are
not issued.

         The proceeds  received by each  Portfolio for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of that Portfolio. The underlying assets
of each  Portfolio  will be  segregated  on the  books of  account,  and will be
charged with the  liabilities  in respect to that  Portfolio and with a share of
the general  liabilities  of the Trust.  Expenses with respect to the Portfolios
are normally  allocated in proportion  to the net asset value of the  respective
Portfolios  except where  allocations of direct expenses can otherwise be fairly
made.

         Rule 18f-2 under the 1940 Act provides that any matter  required by the
provisions  of the  1940  Act or  applicable  state  law,  or  otherwise,  to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
each investment  portfolio affected by such matter.  Rule 18f-2 further provides
that an investment  portfolio  shall be deemed to be affected by a matter unless
the  interests  of each  investment  portfolio  in the matter are  substantially
identical  or the  matter  does  not  affect  any  interest  of  the  investment
portfolio.  Under the Rule, the approval of an investment  advisory agreement or
any change in a fundamental  investment  policy would be effectively  acted upon
with respect to an  investment  portfolio  only if approved by a majority of the
outstanding shares of such investment portfolio. However, the Rule also provides
that  the  ratification  of the  appointment  of  independent  accountants,  the
approval of principal  underwriting  contracts  and the election of Trustees are
exempt  from  the  separate  voting  requirements  stated  above.  In  addition,
shareholders  of each of the classes in a particular  investment  portfolio have
equal  voting  rights  except  that  only  shares  of a  particular  class of an
investment  portfolio will be entitled to vote on matters submitted to a vote of
shareholders  (if any) relating to shareholder  servicing  expenses and transfer
agency fees that are payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting  power of the Trust may elect all of the  Trustees,  irrespective  of the
vote of the other  shareholders.  Meetings of  shareholders of the Trust, or any
series or class thereof, may be called by the Trustees, certain officers or upon
the written  request of holders of 10% or more of the shares entitled to vote at
such  meeting.  To the  extent  required  by  law,  the  Trust  will  assist  in
shareholder  communications in connection with a meeting called by shareholders.
The  shareholders  of the Trust will have voting rights only with respect to the
limited  number of  matters  specified  in the Trust  Agreement  and such  other
matters as the Trustees may determine or may be required by law.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment  (i) that would  adversely  affect  the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust, or any series or class thereof,  or affecting assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless  disregard of the duties  involved in the conduct of his or her office.
The Trust  Agreement  provides for  indemnification  of  Trustees,  officers and
agents of the  Trust  unless  the  recipient  is  liable  by  reason of  willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's office.

         The  Trust  Agreement  provides  that  each  shareholder,  by virtue of
becoming such,  will be held to have expressly  assented and agreed to the terms
of the Trust Agreement and to have become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.


         As  of  December  31,  1999,   substantially  all  of  the  Portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  Portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less  than 10% of the  Trust's  outstanding  shares.  As of the same  date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding  shares of each class of each  Portfolio.  Northern  has advised the
Trust that the following  persons  (whose  mailing  address is: c/o The Northern
Trust Company,  50 South LaSalle,  Chicago,  IL 60675)  beneficially  owned five
percent  or more of the  outstanding  shares of the  Portfolios'  classes  as of
December 31, 1999:


<PAGE>

<TABLE>
<CAPTION>
<S>       <C>                                                                  <C>                  <C>


                                                                                 Number              Percentage
                                                                                of Shares            of Shares
BOND PORTFOLIO
         Class A
                  Lannan Foundation                                            2,636,731.19            5.5%
                  PWC Group Investment Savings Plan                            3,454,473.59            7.2%
         Class C
                  Phycor, Inc.                                                 2,681,747.18           83.3%
                  Tuthill Corp. Supplement Investment                            193,132.22            6.0%
Retirement Plan
                  Kitch Drutchas Wagner Kenney PC                                216,179.46            6.7%
         Class D
                  Bank of Illinois Trust Company                                  70,678.38           90.9%
                  First National Bank of La Grange                                 7,105.53            9.1%

INTERMEDIATE BOND PORTFOLIO
         Class A
                  Illinois Masonic                                               723,272.81           26.7%
                  HEB Savings & Retirement Trust                                 203,646.35            7.5%
                  Marshfield ERP                                                 940,049.84           34.7%
                  Cavalcade Pension Trust                                        156,756.52            5.8%
         Class D
                  Peoples National Bank & Trust                                     1357.25          100%

INTERNATIONAL BOND PORTFOLIO
         Class A
                  Northern Trust Pension Plan                                    947,008.94           57.3%
                  Doe Run Resources Corp.                                        248,757.97           15.1%

SHORT-INTERMEDIATE BOND PORTFOLIO
         Class A
                  Emerson Electric Co. Savings Plans Trust                       914,137.59            8.8%
                  Northern Illinois Medical Center                               523,700.16            5.0%
         Class D
                  BankIllinois Trust Co.                                           5,271.26           78.8%
                  Dacotah Co.                                                      1,414.84           21.2%


<PAGE>



                                                                                 Number              Percentage
                                                                                of Shares            of Shares

U.S. TREASURY INDEX PORTFOLIO
         Class A
                  Belvediere National Bank & Trust                                75,855.20            6.8%
                  Herget National Bank of Pekin                                  101,552.72            9.1%
                           Hubbell Defined Contribution Trust                    117,373.12           10.6%
                  Old Second National Bank
                           The Accreditation Council for Graduate                 84,166.73            7.6%
                    Medical Education
                  The Old Second National Bank                                   176,596.54           15.9%
                  Henkel Rabbi Trust                                             214,903.02           19.4%
         Class C
                  Wilson Sporting Goods 401K Plan                                 15,338.60          100.0%
         Class D
                  First National Bank of LaGrange                                  8,860.82          100.0%

U.S. GOVERNMENT SECURITIES PORTFOLIO
         Class A
                  Electrical Insurance Trust                                     611,704.96           12.7%
                  Sheet Metal Workers' Health & Welfare Plan                     669,486.86           13.9%
                  Schlumberger Ltd. Master Health Care Trust                     433,104.70            9.0%
                  Illinois State Parnters Welfare Fund                           309,162.25            6.4%
                  Mafco                                                          417,079.54            8.7%
                  CTA                                                          1,440,981.74           30.0%
                  Lifeway Christian Resources Master Retirement                  258,397.93            5.4%
Fund
         Class D
                  First Bankers Trust Co.                                         39,747.67           87.4%
                  Enjayco Company                                                  3,997.87            8.8%

</TABLE>

OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.


         Each  Portfolio is  responsible  for the payment of its expenses.  Such
expenses include, without limitation, the fees and expenses payable to Northern,
NTQA and PFPC,  brokerage fees and  commissions,  fees for the  registration  or
qualification  of  Portfolio  shares  under  Federal or state  securities  laws,
expenses  of the  organization  of the  Portfolio,  taxes,  interest,  costs  of
liability insurance, fidelity bonds, indemnification or contribution, any costs,
expenses  or losses  arising  out of any  liability  of, or claim for damages or
other relief asserted  against,  the Trust for violation of any law, legal,  tax
and auditing  fees and  expenses,  servicing  fees,  expenses of  preparing  and
printing prospectuses,  statements of additional  information,  proxy materials,
reports and notices and the printing and distributing of the same to the Trust's
shareholders  and  regulatory  authorities,  compensation  and  expenses  of its
Trustees,  expenses for industry  organizations  such as the Investment  Company
Institute,  miscellaneous  expenses and  extraordinary  expenses incurred by the
Trust.
         The term "majority of the outstanding  shares" of either the Trust or a
particular  Portfolio  means,  with  respect to the  approval  of an  investment
advisory  agreement or a change in a fundamental  investment policy, the vote of
the  lesser  of (i) 67% or more of the  shares  of the  Trust or such  Portfolio
present at a meeting,  if the holders of more than 50% of the outstanding shares
of the Trust or such Portfolio are present or represented by proxy, or (ii) more
than 50% of the outstanding shares of the Trust or such Portfolio.

         Statements  contained in the Prospectus or in this Additional Statement
as to the  contents  of any  contract  or other  documents  referred  to are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the Registration  Statement of
which  the  Prospectus  and this  Additional  Statement  form a part,  each such
statement being qualified in all respects by such reference.

FINANCIAL STATEMENTS

         The audited financial  statements and related report of ______________,
independent  auditors,  contained  in  the  annual  report  to  the  Portfolios'
shareholders  for the fiscal year ended November 30, 1999 (the "Annual  Report")
are hereby  incorporated herein by reference and attached hereto. No other parts
of the Annual Report, including without limitation,  "Management's Discussion of
Portfolio  Performance,"  are  incorporated by reference  herein.  Copies of the
Annual  Report  may be  obtained  upon  request  and  without  charge by calling
1-800-637-1380 (toll-free).


<PAGE>



                                                             5-A
APPENDIX A


Description of Bond Ratings

The  following  summarizes  the highest  six  ratings  used by Standard & Poor's
Ratings  Group,  Inc.,  a division of McGraw  Hill  ("S&P")  for  corporate  and
municipal debt:

     AAA: Debt rated AAA has the highest  rating  assigned by S&P. The obligor's
capacity to meet its financial commitment on the obligation is extremely strong.

     AA: Debt rated AA differs  from the  highest  rated  obligations  only in a
small  degree.  The obligor's  capacity to meet its financial  commitment on the
obligation is very strong.

         A: Debt rated A is somewhat more  susceptible to the adverse effects of
         changes  in  circumstances   and  economic   conditions  than  debt  in
         higher-rated  categories.  However,  the obligor's capacity to meet its
         financial commitment on the obligation is still strong.

         BBB: Debt rated BBB exhibits adequate protection  parameters.  However,
         adverse economic  conditions or changing  circumstances are more likely
         to lead to a weakened  capacity  of the  obligor to meet its  financial
         commitment on the obligation.

         BB  and B:  Debt  rated  BB and B is  regarded  as  having  significant
         speculative  characteristics.  Debt  rated  BB is  less  vulnerable  to
         non-payment  than other  speculative  issues.  However,  it faces major
         ongoing  uncertainties or exposure to adverse business,  financial,  or
         economic  conditions  which  could  lead  to the  obligor's  inadequate
         capacity to meet its financial commitment on the obligation. Debt rated
         B is more vulnerable to non-payment than debt rated BB, but the obligor
         currently  has the  capacity to meet its  financial  commitment  on the
         obligation.  Adverse business,  financial,  or economic conditions will
         likely  impair  the  obligor's  capacity  or  willingness  to meet  its
         financial commitment on the obligation.

     To provide more detailed  indications of credit quality, the ratings AA and
lower may be modified by the  addition of a plus or minus sign to show  relative
standing within
these major rating categories.

S&P may attach the rating "r" to highlight  risks to principal or  volatility of
expected returns which are not addressed in the credit rating.


The following
summarizes  the highest  six ratings  used by Moody's  Investors  Service,  Inc.
("Moody's") for corporate and municipal long-term debt:

         Aaa:  Bonds  that are rated Aaa are  judged to be of the best  quality.
         They carry the smallest  degree of  investment  risk and are  generally
         referred to as "gilt edged." Interest payments are protected by a large
         or by an exceptionally stable margin and principal is secure. While the
         various protective  elements are likely to change,  such changes as can
         be  visualized  are most  unlikely to impair the  fundamentally  strong
         position of such issues.

         Aa:  Bonds  that are rated Aa are  judged to be of high  quality by all
         standards. Together with the Aaa group they comprise what are generally
         known as high  grade  bonds.  They are rated  lower than the best bonds
         because  margins of protection may not be as large as in Aaa securities
         or  fluctuation of protective  elements may be of greater  amplitude or
         there may be other  elements  present  which  make the  long-term  risk
         appear somewhat larger than in Aaa securities.

         A: Bonds that are rated A possess many favorable investment  attributes
         and are to be considered  as  upper-medium-grade  obligations.  Factors
         giving  security to principal and interest are considered  adequate but
         elements may be present  which suggest a  susceptibility  to impairment
         sometime in the future.

         Baa:  Bonds  that  are  rated  Baa  are   considered  as   medium-grade
         obligations  (i.e.,  they  are  neither  highly  protected  nor  poorly
         secured).  Interest payments and principal security appear adequate for
         the present but certain  protective  elements  may be lacking or may be
         characteristically unreliable over any great length of time. Such bonds
         lack   outstanding   investment   characteristics   and  in  fact  have
         speculative characteristics as well.

         Ba and B: Bonds that possess one of these ratings provide  questionable
         protection of interest and  principal.  Ba indicates  some  speculative
         elements.  B indicates a general lack of  characteristics  of desirable
         investment.

The foregoing  ratings for corporate and municipal  long-term debt are sometimes
presented in parenthesis  preceded with a "con",  indicating the bonds are rated
conditionally.  Such  parenthetical  rating denotes the probable  credit stature
upon completion of some act or the fulfillment of some condition.

     The  following  summarizes  the highest  six ratings  used by Duff & Phelps
Credit Rating Co. ("D&P") for corporate and municipal long-term debt:

     AAA: Debt rated AAA is of the highest credit quality.  The risk factors are
considered to be  negligible,  being only slightly more than for risk-free  U.S.
Treasury debt.

     AA: Debt rated AA is of high credit quality. Protection factors are strong.
Risk is modest  but may vary  slightly  from time to time  because  of  economic
conditions.

     A: Debt rated A has  protection  factors  which are average  but  adequate.
However  risk  factors  are more  variable  and  greater in periods of  economic
stress.

         BBB:  Debt  rated BBB has  below-average  protection  factors  but such
         protection   factors  are  still  considered   sufficient  for  prudent
         investment. Considerable variability in risk is present during economic
         cycles.

         BB and B:  Debt  rated BB or B is  considered  to be  below  investment
         grade.  Debt rated BB is deemed  likely to meet  obligations  when due.
         Debt rated B possesses the risk that  obligations  will not be met when
         due.

     To provide more detailed  indications of credit quality, the ratings AA and
lower may be  modified  by the  addition of a plus (+) or minus (-) sign to show
relative standing within these major categories.

     The following  summarizes the highest six ratings used by Fitch IBCA,  Inc.
("Fitch") for corporate and municipal bonds:

         AAA: Bonds  considered to be investment grade and of the highest credit
         quality. These ratings denote the lowest expectation of investment risk
         and are  assigned  only in case of  exceptionally  strong  capacity for
         timely  payment  of  financial  commitments.  This  capacity  is highly
         unlikely to be affected by reasonably foreseeable events.

         AA: Bonds  considered  to be  investment  grade and of very high credit
         quality. These ratings denote a very low expectation of credit risk and
         indicate  very  strong   capacity  for  timely   payment  of  financial
         commitments.   This  capacity  is  not   significantly   vulnerable  to
         foreseeable events.

         A: Bonds  considered to be investment grade and of high credit quality.
         These  ratings  denote a low  expectation  of credit risk and  indicate
         strong  capacity  for timely  payment of  financial  commitments.  This
         capacity  may,   nevertheless,   be  more   vulnerable  to  changes  in
         circumstances  or in  economic  conditions  than is the case for higher
         ratings.

         BBB:  Bonds  considered  to be  investment  grade  and of  good  credit
         quality. These ratings denote that there is currently a low expectation
         of  credit  risk.   The  capacity  for  timely   payment  of  financial
         commitments   is   considered   adequate,   but   adverse   changes  in
         circumstances and in economic conditions are more likely to impair this
         category.

         BB: Bonds  considered to be  speculative.  These ratings  indicate that
         there is a possibility of credit risk  developing,  particularly as the
         result of adverse  economic  changes  over time;  however,  business or
         financial  alternatives may be available to allow financial commitments
         to be met. Securities rated in this category are not investment grade.

         B: Bonds are considered highly speculative. These ratings indicate that
         significant  credit  risk is  present,  but a limited  margin of safety
         remains.  Financial  commitments  are  currently  being  met;  however,
         capacity  for  continued   payment  is  contingent  upon  a  sustained,
         favorable business and economic environment.

     To provide more detailed  indications of credit quality,  the Fitch ratings
"AA" and lower may be modified  by the  addition of a plus (+) or minus (-) sign
to show relative standing within these major rating categories.


Description of Municipal Note Ratings

The following summarizes the two highest ratings by S&P for short-term municipal
notes:

         SP-1:  Strong  capacity to pay  principal  and  interest.  Those issues
determined  to  possess  very  strong  characteristics  are  given  a  plus  (+)
designation.

         SP-2:  Satisfactory  capacity to pay principal and interest,  with some
vulnerability  to adverse  financial  and economic  changes over the term of the
notes.

The following  summarizes the two highest ratings used by Moody's for short-term
municipal notes and variable rate demand obligations:

         MIG-1/VMIG-1:  Obligations  bearing these  designations are of the best
         quality, enjoying strong protection by established cash flows, superior
         liquidity support or demonstrated  broad-based access to the market for
         refinancing.

         MIG-2/VMIG-2:  Obligations  bearing  these  designations  are  of  high
quality  with  margins  of  protection  ample  although  not as  large as in the
preceding group.

The two highest rating  categories of D&P for  short-term  debt are D-1 and D-2.
D&P employs three  designations,  D-1+, D-1 and D-1-,  within the highest rating
category.  D-1+ indicates the highest  certainty of timely  payment.  Short-term
liquidity,  including  internal  operating  factors and/or access to alternative
sources  of funds,  is  outstanding,  and safety is just  below  risk-free  U.S.
Treasury  short-term  obligations.  D-1 indicates  very high certainty of timely
payment.  Liquidity  factors are  excellent  and  supported by good  fundamental
protection  factors.  Risk factors are minor.  D-1-  indicates high certainty of
timely payment.  Liquidity  factors are strong and supported by good fundamental
protection factors. Risk factors are very small. D-2 indicates good certainty of
timely payment.  Liquidity factors and company fundamentals are sound.  Although
ongoing  funding  needs may  enlarge  total  financing  requirements,  access to
capital markets is good. Risk factors are small.

D&P uses the  fixed-income  ratings  described above under  "Description of Bond
Ratings" for tax-exempt notes and other short-term  obligations.  Fitch uses the
short-term  ratings  described  below under  "Description  of  Commercial  Paper
Ratings" for municipal notes.

Description of Commercial Paper Ratings

Commercial paper rated A-1 by S&P indicates that the obligor's  capacity to meet
its  financial  commitment  is  strong.  Those  issues  for which the  obligor's
capacity to meet its financial  commitment on the obligation is extremely strong
are denoted in A-1+. The obligor's capacity to meet its financial  commitment on
commercial  paper rated A-2 is satisfactory  but these  obligations are somewhat
more susceptible to the adverse effects of changes in circumstances and economic
conditions than obligations in higher rating categories.

The rating Prime-1 is the highest  commercial  paper rating assigned by Moody's.
Issuers or  supporting  institutions  rated  Prime-1  are  considered  to have a
superior  capacity  for  repayment  of  short-term  debt  obligations.   Prime-1
repayment  ability  will often be evidenced  by the  following  characteristics:
leading market positions in well-established industries; high rates of return on
funds employed; conservative capitalization structures with moderate reliance on
debt and ample  asset  protection;  broad  margins in earning  coverage of fixed
financial charges and high internal cash generation; and well-established access
to a range of  financial  markets and assured  sources of  alternate  liquidity.
Issuers or supporting institutions rated Prime-2 are considered to have a strong
ability for repayment of senior short-term debt obligations.  This will normally
be evidenced by many of the characteristics  cited above but to a lesser degree.
Earnings  trends and  coverage  ratios,  while  sound,  will be more  subject to
variation. Capitalization characteristics,  while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.

The  following  summarizes  the  highest  ratings  used by Fitch for  short-term
obligations:

         F1  securities  possess  exceptionally  strong credit  quality.  Issues
         assigned this rating are regarded as having the strongest  capacity for
         timely  payment  of  financial  commitments  and may have an added + to
         denote any exceptionally strong credit feature.

         F2 securities possess good credit quality.  Issues assigned this rating
         have  a   satisfactory   capacity  for  timely   payment  of  financial
         commitments, but the margin of safety is not as great as in the case of
         the higher ratings.

D&P uses the  short-term  ratings  described  above under  "Description  of Note
Ratings" for commercial paper.


<PAGE>


                                  B-55
                                  B-6
APPENDIX B

As  stated  in  their   Prospectus,   the  Portfolios  may  enter  into  futures
transactions and options thereon.  Such transactions are described more fully in
this Appendix.

I.  Interest Rate Futures Contracts

         Use of Interest Rate Futures Contracts.  Bond prices are established in
both the cash  market and the  futures  market.  In the cash  market,  bonds are
purchased  and sold with payment for the full  purchase  price of the bond being
made in cash,  generally  within  three  business  days after the trade.  In the
futures market, only a contract is made to purchase or sell a bond in the future
for  a  set  price  on a  certain  date.  Historically,  the  prices  for  bonds
established  in the  futures  markets  have  tended  to  move  generally  in the
aggregate  in concert  with the cash market  prices and have  maintained  fairly
predictable  relationships.  Accordingly,  a Portfolio  could use interest  rate
futures  contracts as a defense,  or hedge,  against  anticipated  interest rate
changes.  As described  below,  this could  include the use of futures  contract
sales to protect  against  expected  increases in interest  rates and the use of
futures contract purchases to offset the impact of interest rate declines.

         A Portfolio  presently could  accomplish a similar result to that which
it hopes to achieve  through the use of futures  contracts by selling bonds with
long maturities and investing in bonds with short maturities when interest rates
are expected to increase, or conversely,  selling short-term bonds and investing
in long-term bonds when interest rates are expected to decline. However, because
of the liquidity that is often available in the futures  market,  the protection
is more likely to be achieved,  perhaps at a lower cost and without changing the
rate of interest being earned by a Portfolio, through using futures contracts.

         Interest  rate futures  contracts  can also be used by a Portfolio  for
non-hedging (speculative) purposes to increase total return.

         Description  of Interest  Rate  Futures  Contracts.  An  interest  rate
futures contract sale would create an obligation by a Portfolio,  as seller,  to
deliver the specific type of financial  instrument called for in the contract at
a specific future time for a specified price. A futures contract  purchase would
create an  obligation  by a Portfolio,  as  purchaser,  to take  delivery of the
specific type of financial  instrument  at a specific  future time at a specific
price. The specific securities delivered or taken,  respectively,  at settlement
date,  would not be  determined  until at or near that date.  The  determination
would be in  accordance  with the rules of the  exchange  on which  the  futures
contract sale or purchase was made.



<PAGE>


         Although interest rate futures contracts by their terms call for actual
delivery or acceptance of securities, in most cases the contracts are closed out
before a settlement date without the making or taking of delivery of securities.
Closing out a futures contract sale is effected by a Portfolio's entering into a
futures contract  purchase for the same aggregate amount of the specific type of
financial  instrument and the same delivery date. If the price of a sale exceeds
the price of the  offsetting  purchase,  a  Portfolio  is  immediately  paid the
difference  and thus realizes a gain. If the  offsetting  purchase price exceeds
the sale price, a Portfolio pays the difference and realizes a loss.  Similarly,
the  closing  out of a futures  contract  purchase  is  effected  by a Portfolio
entering into a futures  contract sale. If the offsetting sale price exceeds the
purchase  price, a Portfolio  realizes a gain, and if the purchase price exceeds
the offsetting sale price, a Portfolio realizes a loss.

         Interest rate futures contracts are traded in an auction environment on
the floors of several  exchanges--principally,  the Chicago Board of Trade,  the
Chicago  Mercantile  Exchange  and the -New York Futures  Exchange.  A Portfolio
would deal only in standardized contracts on recognized exchanges. Each exchange
guarantees performance under contract provisions through a clearing corporation,
a nonprofit organization managed by the exchange membership.

         A public  market  now  exists in  futures  contracts  covering  various
financial  instruments  including  long-term  United States  Treasury  Bonds and
Notes;  Government  National Mortgage  Association (GNMA) modified  pass-through
mortgage  backed  securities;  three-month  United States  Treasury  Bills;  and
ninety-day  commercial paper. A Portfolio may trade in any interest rate futures
contracts for which there exists a public market, including, without limitation,
the foregoing instruments.

II.  Index Futures Contracts

     General.  A bond index assigns relative values to the bonds included in the
index which fluctuates with changes in the market values of the bonds included.

         A  Portfolio  may sell  index  futures  contracts  in order to offset a
decrease in market value of its portfolio securities that might otherwise result
from a market  decline.  A Portfolio  may do so either to hedge the value of its
portfolio as a whole, or to protect against  declines,  occurring prior to sales
of  securities,  in the  value  of the  securities  to be  sold.  Conversely,  a
Portfolio may purchase index futures  contracts in  anticipation of purchases of
securities.  A long futures  position may be terminated  without a corresponding
purchase of securities.

         In  addition,  a  Portfolio  may utilize  index  futures  contracts  in
anticipation  of changes  in the  composition  of its  portfolio  holdings.  For
example,  in the event that a Portfolio  expects to narrow the range of industry
groups  represented  in its  holdings it may,  prior to making  purchases of the
actual securities,  establish a long futures position based on a more restricted
index, such as an index comprised of securities of a particular  industry group.
A Portfolio may also sell futures contracts in connection with this strategy, in
order to protect against the possibility  that the value of the securities to be
sold as part of the  restructuring  of the  portfolio  will decline prior to the
time of sale.

         Index futures contracts may also be used by a Portfolio for non-hedging
(speculative) purposes, to increase total return.

III.     Futures Contracts on Foreign Currencies (International Bond Portfolio)

         A futures contract on foreign currency creates a binding  obligation on
one party to deliver, and a corresponding  obligation on another party to accept
delivery of, a stated quantity of foreign currency,  for an amount fixed in U.S.
dollars.  Foreign  currency  futures  may be used  by a  Portfolio  for  hedging
purposes in  anticipation  of  fluctuations  in exchange  rates between the U.S.
dollars and other currencies arising from multinational transactions.

         The  International  Bond  Portfolio  may also use futures  contracts on
foreign  currencies  for  non-hedging  (speculative)  purposes to increase total
return.


IV.  Margin Payments

         Unlike purchases or sales of portfolio securities,  no price is paid or
received  by a  Portfolio  upon  the  purchase  or sale of a  futures  contract.
Initially,  the  Portfolio  will be required to deposit  with the broker or in a
segregated  account with the  Custodian or a  sub-custodian  an amount of liquid
assets, known as initial margin, based on the value of the contract.  The nature
of initial  margin in futures  transactions  is different from that of margin in
security  transactions  in that  futures  contract  margin  does not involve the
borrowing  of funds by the  customer to finance the  transactions.  Rather,  the
initial  margin is in the nature of a performance  bond or good faith deposit on
the contract which is returned to the Portfolio upon  termination of the futures
contract  assuming all contractual  obligations have been satisfied.  Subsequent
payments,  called variation  margin,  to and from the broker,  will be made on a
daily basis as the price of the  underlying  instruments  fluctuates  making the
long and short  positions  in the  futures  contract  more or less  valuable,  a
process known as marking-to-the-market. For example, when a particular Portfolio
has  purchased a futures  contract  and the price of the  contract  has risen in
response  to a rise in the  underlying  instruments,  that  position  will  have
increased in value and the Portfolio will be entitled to receive from the broker
a variation  margin payment equal to that increase in value.  Conversely,  where
the  Portfolio  has  purchased  a futures  contract  and the price of the future
contract has declined in response to a decrease in the  underlying  instruments,
the position would be less valuable and the Portfolio  would be required to make
a variation margin payment to the broker. At any time prior to expiration of the
futures  contract,  the  Portfolio's  adviser may elect to close the position by
taking an opposite position,  subject to the availability of a secondary market,
which  will  operate  to  terminate  the  Portfolio's  position  in the  futures
contract.  A final  determination of variation  margin is then made,  additional
cash is required to be paid by or released to the  Portfolio,  and the Portfolio
realizes a loss or gain.

V.  Risks of Transactions in Futures Contracts

         There are several  risks in  connection  with the use of futures by the
Portfolios. In connection with the use of futures for hedging purposes, one risk
arises because of the imperfect  correlation  between  movements in the price of
the futures and movements in the price of the instruments  which are the subject
of the hedge.  The price of the future may move more than or less than the price
of the instruments being hedged. If the price of the futures moves less than the
price of the instruments  which are the subject of the hedge, the hedge will not
be fully effective but, if the price of the  instruments  being hedged has moved
in an unfavorable direction, the Portfolio would be in a better position than if
it had not hedged at all. If the price of the instruments being hedged has moved
in a favorable direction, this advantage will be partially offset by the loss on
the futures. If the price of the futures moves more than the price of the hedged
instruments, the Portfolio involved will experience either a loss or gain on the
futures  which will not be  completely  offset by  movements in the price of the
instruments  which are the subject of the hedge. To compensate for the imperfect
correlation of movements in the price of instruments  being hedged and movements
in the  price  of  futures  contracts,  the  Portfolio  may buy or sell  futures
contracts in a greater dollar amount than the dollar amount of instruments being
hedged if the  volatility  over a  particular  time period of the prices of such
instruments  has been greater than the  volatility  over such time period of the
futures,  or if otherwise  deemed to be appropriate by the Investment  Advisers.
Conversely,  the  Portfolios  may buy or sell  fewer  futures  contracts  if the
volatility over a particular time period of the prices of the instruments  being
hedged is less than the volatility over such time period of the futures contract
being used, or if otherwise deemed to be appropriate by the Investment Advisers.
It is also  possible  that,  where a  Portfolio  had sold  futures  to hedge its
portfolio against a decline in the market,  the market may advance and the value
of  instruments  held  in the  Portfolio  may  decline.  If this  occurred,  the
Portfolio would lose money on the futures and also experience a decline in value
in its portfolio securities.

         When futures are purchased to hedge against a possible  increase in the
price of  securities  before a  Portfolio  is able to  invest  its cash (or cash
equivalents) in an orderly  fashion,  it is possible that the market may decline
instead;  if the  Portfolio  then  concludes not to invest its cash at that time
because of concern as to possible  further  market decline or for other reasons,
the Portfolio will realize a loss on the futures  contract that is not offset by
a reduction in the price of the instruments that were to be purchased.

         In  addition  to  the  possibility  that  there  may  be  an  imperfect
correlation,  or no correlation at all, between movements in the futures and the
instruments being hedged, the price of futures may not correlate  perfectly with
movement  in the cash  market due to certain  market  distortions.  Rather  than
meeting  additional  margin  deposit  requirements,  investors may close futures
contracts  through  off-setting  transactions  which  could  distort  the normal
relationship  between  the cash and futures  markets.  Second,  with  respect to
financial  futures  contracts,  the liquidity of the futures  market  depends on
participants entering into off-setting transactions rather than making or taking
delivery. To the extent participants decide to make or take delivery,  liquidity
in the futures market could be reduced thus producing  distortions.  Third, from
the point of view of speculators, the deposit requirements in the futures market
are less onerous than margin  requirements in the securities market.  Therefore,
increased  participation  by  speculators  in the futures  market may also cause
temporary price  distortions.  Due to the possibility of price distortion in the
futures market, and because of the imperfect  correlation  between the movements
in the cash market and movements in the price of futures,  a correct forecast of
general market trends or interest rate movements by the Investment  Advisers may
still not result in a successful hedging transaction over a short time frame.

         Positions  in futures may be closed out only on an exchange or board of
trade  which  provides  a  secondary  market  for  such  futures.  Although  the
Portfolios  intend to purchase or sell  futures  only on  exchanges or boards of
trade where there appear to be active secondary  markets,  there is no assurance
that a liquid  secondary market on any exchange or board of trade will exist for
any particular  contract or at any particular time. In such event, it may not be
possible  to close a futures  investment  position,  and in the event of adverse
price movements, the Portfolios would continue to be required to make daily cash
payments of variation margin.  However, in the event futures contracts have been
used to hedge portfolio  securities,  such securities will generally not be sold
until the futures contract can be terminated. In such circumstances, an increase
in the price of the  securities,  if any,  may  partially or  completely  offset
losses  on the  futures  contract.  However,  as  described  above,  there is no
guarantee that the price of the securities will in fact correlate with the price
movements  in the  futures  contract  and thus  provide  an  offset on a futures
contract.

         Further, it should be noted that the liquidity of a secondary market in
a futures contract may be adversely affected by "daily price fluctuation limits"
established  by commodity  exchanges  which limit the amount of fluctuation in a
futures  contract  price during a single  trading day.  Once the daily limit has
been  reached in the  contract,  no trades may be entered into at a price beyond
the limit,  thus  preventing  the  liquidation  of open futures  positions.  The
trading  of futures  contracts  is also  subject  to the risk of trading  halts,
suspensions,   exchange  or  clearing  house  equipment   failures,   government
intervention,  insolvency  of a  brokerage  firm  or  clearing  house  or  other
disruptions  of normal  activity,  which  could at times  make it  difficult  or
impossible to liquidate existing positions or to recover excess variation margin
payments.

         Successful  use of futures  by the  Portfolios  is also  subject to the
Investment  Advisers' ability to predict correctly movements in the direction of
the market.  For  example,  if a  particular  Portfolio  has hedged  against the
possibility of a decline in the market adversely affecting securities held by it
and securities prices increase  instead,  the Portfolio will lose part or all of
the benefit to the increased value of its securities which it has hedged because
it will have offsetting losses in its futures  positions.  In addition,  in such
situations,  if the  Portfolio  has  insufficient  cash,  it may  have  to  sell
securities to meet daily variation margin requirements. Such sales of securities
may be, but will not  necessarily  be, at  increased  prices  which  reflect the
rising market.  The  Portfolios may have to sell  securities at a time when they
may be disadvantageous to do so.

         Futures  purchased or sold by the  International  Bond  Portfolio  (and
related  options) may be traded on foreign  exchanges.  Participation in foreign
futures and foreign options transactions  involves the execution and clearing of
trades  on or  subject  to the rules of a foreign  board of trade.  Neither  the
National Futures  Association nor any domestic exchange regulates  activities of
any foreign boards of trade,  including the execution,  delivery and clearing of
transactions,  or has the power to compel  enforcement of the rules of a foreign
board of trade or any applicable  foreign law. This is true even if the exchange
is formally  linked to a domestic  market so that a position taken on the market
may be liquidated by a transaction  on another  market.  Moreover,  such laws or
regulations  will vary  depending  on the  foreign  country in which the foreign
futures or foreign options transaction occurs. For these reasons,  customers who
trade foreign futures of foreign options  contracts may not be afforded  certain
of the protective measures provided by the Commodity Exchange Act, the Commodity
Futures Trading Commission's  ("CFTC") regulations and the rules of the National
Futures  Association  and any  domestic  exchange,  including  the  right to use
reparations  proceedings before the CFTC and arbitration proceedings provided by
the  National  Futures   Association  or  any  domestic  futures  exchange.   In
particular,  the  investments  of the  International  Bond  Portfolio in foreign
futures or foreign options transactions may not be provided the same protections
in respect of transactions on United States futures exchanges.  In addition, the
price of any foreign  futures or foreign  options  contract  and,  therefore the
potential profit and loss thereon may be affected by any variance in the foreign
exchange rate between the time an order is placed and the time it is liquidated,
offset or exercised.

VI.  Options on Futures Contracts

         The  Portfolios  may  purchase and write (sell) call and put options on
the futures  contracts  described  above. A futures option gives the holder,  in
return for the premium  paid,  the right to buy (call) from or sell (put) to the
writer of the option a futures  contract at a specified price at any time during
the period of the option.  Upon exercise,  the writer of the option is obligated
to pay the  difference  between the cash value of the futures  contract  and the
exercise price. Like the buyer or seller of a futures  contract,  the holder, or
writer,  of an  option  has the right to  terminate  its  position  prior to the
scheduled  expiration  of the option by selling,  or purchasing an option of the
same series, at which time the person entering into the closing transaction will
realize a gain or loss. A Portfolio  will be required to deposit  initial margin
and variation  margin with respect to put and call options on futures  contracts
written by it  pursuant  to  brokers'  requirements  similar to those  described
above. Net option premiums received will be included as initial margin deposits.

         Investments in futures options involve some of the same  considerations
that are involved in  connection  with  investments  in futures  contracts  (for
example, the existence of a liquid secondary market). See "Risks of Transactions
in Futures Contracts" above. In addition, the purchase or sale of an option also
entails the risk that changes in the value of the  underlying  futures  contract
will not correspond to changes in the value of the option  purchased.  Depending
on the pricing of the option compared to either the futures  contract upon which
it is based, or upon the price of any underlying  instruments,  an option may or
may  not  be  less  risky  than  ownership  of  the  futures  contract  or  such
instruments. In general, the market prices of options can be expected to be more
volatile than the market prices on the underlying futures contract.  Compared to
the purchase or sale of futures contracts,  however, the purchase of call or put
options on futures  contracts may,  unlike futures  contracts  where the risk of
loss is  potentially  unlimited,  frequently  involve less potential risk to the
Portfolio because the maximum amount at risk is the premium paid for the options
(plus  transaction  costs).  The  writing  of an option  on a  futures  contract
involves risks similar to those risks relating to the sale of futures contracts.

VII.  Other Matters

         Each  Portfolio  intends  to comply  with the  regulations  of the CFTC
exempting it from  registration as a "commodity  pool operator."  Accounting for
futures  contracts  will be in accordance  with  generally  accepted  accounting
principles.


<PAGE>


PART B

STATEMENT OF ADDITIONAL INFORMATION

SHARES

NORTHERN INSTITUTIONAL FUNDS

GOVERNMENT SELECT PORTFOLIO
GOVERNMENT PORTFOLIO
DIVERSIFIED ASSETS PORTFOLIO
TAX-EXEMPT PORTFOLIO
MUNICIPAL PORTFOLIO


         This  Statement  of  Additional  Information  dated  April 1, 2000 (the
"Additional  Statement")  is not a prospectus.  Copies of the  prospectus  dated
April 1, 2000 for the Shares of the Government Select,  Government,  Diversified
Assets,  Municipal and  Tax-Exempt  Portfolios  (the  "Portfolios")  of Northern
Institutional  Funds (each, a  "Prospectus")  may be obtained  without charge by
calling  1-800-637-1380  (toll-free).  Each Portfolio also offers two additional
share  classes,  Service  Shares and Premier  Shares,  which are  described in a
separate  statement of additional  information.  Capitalized terms not otherwise
defined have the same meaning as in the Prospectus.

         The audited financial statements and related report of _______________,
independent  auditors,  contained  in  the  annual  report  to  the  Portfolios'
shareholders  for the fiscal year ended  November 30, 1999 (except for Municipal
Portfolio, which did not commence operations during the period) are incorporated
herein by reference in the section  entitled  "Financial  Statements."  No other
parts of the annual report are incorporated  herein by reference.  Copies of the
annual  report  may be  obtained  upon  request  and  without  charge by calling
1-800-637-1380 (toll-free).


<PAGE>


INDEX
                                                                      Page

         ADDITIONAL INVESTMENT INFORMATION........................... B-3
                  Classification and History......................... B-3
                  Investment Objectives, Strategies and Risks.......  B-3
                  Investment Restrictions............................ B-12
         ADDITIONAL TRUST INFORMATION................................ B-15
                  Trustees and Officers.............................. B-15
                  Investment Adviser, Transfer Agent and Custodian... B-20
                  Portfolio Transactions............................. B-25
                  Co-Administrators and Distributor.................  B-25
                  Counsel and Auditors..............................  B-28
                  In-Kind Purchases and Redemptions.................  B-28
                  Third-Party Fees and Requirements.................  B-29
         PERFORMANCE INFORMATION....................................  B-29
         AMORTIZED COST VALUATION...................................  B-32
         DESCRIPTION OF SHARES......................................  B-33
         ADDITIONAL INFORMATION CONCERNING TAXES....................  B-37
                  General  ...........................................B-37
                  Special Tax Considerations Pertaining to the
                                         Tax-Exempt Portfolio       B-38
                  Foreign Investors..............................    B-39
                  Conclusion.....................................    B-39
         OTHER INFORMATION ..........................................B-40
         FINANCIAL STATEMENTS....................................    B-40
         APPENDIX A        .....................................    A-1

                                                     ----

No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection  with the offering of Shares made by the Prospectus  and, if given
or made, such information or  representations  must not be relied upon as having
been  authorized  by the  Trust  or its  distributor.  The  Prospectus  does not
constitute an offering by the Trust or by the distributor in any jurisdiction in
which such offering may not lawfully be made.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.



<PAGE>


                                             ADDITIONAL INVESTMENT INFORMATION

Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment  company.  Each  Portfolio is  classified  as  diversified  under the
Investment Company Act of 1940, as amended (the "1940 Act").

         Each Portfolio is a series of the Trust, which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").  The  Trust,  is  the  result  of  a  reorganization  of  a
Massachusetts business trust known as The Benchmark Funds on March 31, 1998. The
Trust's name was changed from The Benchmark Funds to the Northern  Institutional
Funds on July 15, 1998.  The Trust also offers six fixed  income,  one balanced,
and nine equity  portfolios,  which are not  described  in this  document.


Investment Objectives, Strategies and Risks

         The following  supplements  the investment  objectives,  strategies and
risks of the Portfolios as set forth in the Prospectus. The investment objective
of each Portfolio  (except  Municipal  Portfolio) may not be changed without the
vote of the majority of the Portfolio's  outstanding shares. Except as expressly
noted  below,  however,  each  Portfolio's  investment  policies  may be changed
without  shareholder  approval.

Commercial  Paper,  Bankers'  Acceptances,
Certificates of Deposit and Time Deposits

         Commercial  paper  represents  short-term  unsecured  promissory  notes
issued in  bearer  form by banks or bank  holding  companies,  corporations  and
finance companies.  Certificates of deposit are negotiable  certificates  issued
against funds  deposited in a commercial  bank for a definite period of time and
earning a specified return.  Bankers' acceptances are negotiable drafts or bills
of  exchange,  normally  drawn by an importer  or  exporter to pay for  specific
merchandise,  which are "accepted" by a bank,  meaning, in effect, that the bank
unconditionally  agrees to pay the face  value of the  instrument  on  maturity.
Fixed time deposits are bank  obligations  payable at a stated maturity date and
bearing interest at a fixed rate. Fixed time deposits may be withdrawn on demand
by the  investor,  but may be subject to early  withdrawal  penalties  that vary
depending upon market  conditions and the remaining  maturity of the obligation.
There are no  contractual  restrictions  on the right to  transfer a  beneficial
interest in a fixed time deposit to a third party.

     As  stated  in  the  Prospectus,   the  Diversified  Assets  and  Municipal
Portfolios may each invest a portion of its assets in the obligations of foreign
banks  and  foreign  branches  of  domestic  banks.  Such  obligations   include
Eurodollar Certificates of Deposit ("ECDs"),  which are U.S.  dollar-denominated
certificates  of deposit issued by offices of foreign and domestic banks located
outside the United States;  Eurodollar  Time Deposits  ("ETDs"),  which are U.S.
dollar-denominated  deposits  in a foreign  branch  of a U.S.  bank or a foreign
bank;  Canadian Time Deposits  ("CTDs"),  which are essentially the same as ETDs
except they are issued by Canadian offices of major Canadian banks; Schedule Bs,
which are obligations  issued by Canadian branches of foreign or domestic banks;
Yankee Certificates of Deposit ("Yankee CDs"), which are U.S. dollar-denominated
certificates  of deposit  issued by a U.S.  branch of a foreign bank and held in
the United States;  and Yankee Bankers'  Acceptances  ("Yankee Bas"),  which are
U.S.  dollar-denominated  bankers'  acceptances  issued  by a U.S.  branch  of a
foreign bank and held in the United States.

     The Diversified Assets Portfolio may also invest in high quality commercial
paper  and  other   obligations   issued  or  guaranteed  by  U.S.  and  foreign
corporations  and other issuers rated (at the time of purchase) A-2 or higher by
Standard & Poor's  Ratings  Group,  Inc.  ("S&P"),  Prime-2 or higher by Moody's
Investors Service,  Inc.  ("Moody's"),  Duff 2 or higher by Duff & Phelps Credit
Rating Co.  ("D&P"),  F-2 or higher by Fitch IBCA,  Inc.  ("Fitch")  or TBW-2 or
higher by Thomson BankWatch,  Inc. ("TBW"). The Diversified Assets Portfolio may
also  invest  in rated  and  unrated  corporate  bonds,  notes,  paper and other
instruments that are of comparable  quality to the commercial paper permitted to
be purchased by the Portfolio.


Zero Coupon Bonds

         To  the  extent  consistent  with  Municipal   Portfolio's   investment
objective,  the Portfolio may invest in zero coupon bonds. Zero coupon bonds are
debt securities  issued or sold at a discount from their face value and which do
not entitle the holder to any periodic  payment of interest prior to maturity or
a specified  date.  The original  issue  discount  varies  depending on the time
remaining until maturity or cash payment date,  prevailing  interest rates,  the
liquidity of the  security and  perceived  credit  quality of the issuer.  These
securities  also may take the form of debt securities that have been stripped of
their  unmatured  interest  coupons,  the  coupons  themselves  or  receipts  or
certificates  representing  interests  in  such  stripped  debt  obligations  or
coupons. The market prices of zero coupon bonds generally are more volatile than
the market prices of interest bearing  securities and are likely to respond to a
greater  degree of changes in interest  rates than interest  bearing  securities
having similar maturities and credit quality.

         Zero coupon bonds involve the additional risk that,  unlike  securities
that periodically pay interest to maturity, the Municipal Portfolio will realize
no  cash  until a  specified  future  payment  date  unless  a  portion  of such
securities is sold and, if the issuer of such securities defaults, the Portfolio
may obtain no return at all on its  investment.  In  addition,  even though such
securities  do not  provide for the  payment of current  interest  in cash,  the
Municipal Portfolio is nonetheless  required to accrue income on such investment
for each  taxable  year and  generally  is required to  distribute  such accrued
amounts  (net of  deductible  expenses,  if any) to avoid being  subject to tax.
Because no cash is generally received at the time of the accrual,  the Municipal
Portfolio  may be required to liquidate  other  portfolio  securities  to obtain
sufficient cash to satisfy Federal tax distribution  requirements  applicable to
the Portfolio.

Asset-Backed Securities

         To the extent  described in the  Prospectus,  the  Diversified  Assets,
Tax-Exempt and Municipal Portfolios may purchase asset-backed securities,  which
are  securities  backed  by  mortgages,   installment  contracts,   credit  card
receivables  or other assets.  Asset-backed  securities  represent  interests in
"pools"  of assets in which  payments  of both  interest  and  principal  on the
securities are made periodically, thus in effect "passing through" such payments
made by the individual borrowers on the assets that underlie the securities, net
of any fees paid to the issuer or guarantor of the securities.  The average life
of  asset-backed  securities  varies  with  the  maturities  of  the  underlying
instruments,   and  the  average  life  of  a  mortgage-backed   instrument,  in
particular, is likely to be substantially less than the original maturity of the
mortgage pools  underlying  the securities as a result of mortgage  prepayments.
For this and other reasons,  an asset-backed  security's  stated maturity may be
shortened,  and  the  security's  total  return  may  be  difficult  to  predict
precisely.
         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower than expected prepayments will decrease, yield to maturity.


         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.  Such difficulties are not, however, expected to have a significant
effect on the Diversified Assets,  Tax-Exempt and Municipal Portfolios since the
remaining maturity of any asset-backed  security  acquired,  as calculated under
applicable SEC regulations, will be 397 days or less.

         Asset-backed securities acquired by the Diversified Assets,  Tax-Exempt
and  Municipal  Portfolios  may  include  collateralized   mortgage  obligations
("CMOs") issued by private  companies.  CMOs provide the holder with a specified
interest  in  the  cash  flow  of  a  pool  of  underlying  mortgages  or  other
mortgage-backed  securities.  Issuers  of CMOs  ordinarily  elect to be taxed as
pass-through   entities  known  as  real  estate  mortgage  investment  conduits
("REMICs").  CMOs are issued in multiple classes, each with a specified fixed or
floating  interest  rate and a final  distribution  date.  The relative  payment
rights of the various CMO classes may be  structured  in a variety of ways.  The
Portfolio will not purchase  "residual" CMO  interests,  which normally  exhibit
greater price volatility.

     There  are a  number  of  important  differences  among  the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by the GNMA  include  GNMA  Mortgage  Pass-Through  Certificates  (also known as
"Ginnie  Maes"),  which are guaranteed as to the timely payment of principal and
interest  by GNMA and backed by the full faith and credit of the United  States.
GNMA is a  wholly-owned  U.S.  Government  corporation  within the Department of
Housing and Urban  Development.  GNMA  certificates  also are  supported  by the
authority of GNMA to borrow funds from the U.S.  Treasury to make payments under
its guarantee. Mortgage-backed securities issued by FNMA include FNMA Guaranteed
Mortgage  Pass-Through  Certificates  (also known as "Fannie  Maes"),  which are
solely the  obligations  of FNMA and are not backed by or entitled to full faith
and credit of the United States, but are supported by the right of the issuer to
borrow from the  Treasury.  FNMA is a  government-sponsored  organization  owned
entirely  by  private  stockholders.  Fannie  Maes are  guaranteed  as to timely
payment of the  principal  and  interest  by FNMA.  Mortgage-related  securities
issued by the FHLMC  include FHLMC  Mortgage  Participation  Certificates  (also
known as "Freddie Macs" or "PCs").  FHLMC is a corporate  instrumentality of the
United States,  created pursuant to an Act of Congress,  which is owned entirely
by  Federal  Home  Loan  Banks.  Freddie  Macs  are  not  guaranteed  and do not
constitute a debt or obligation of the United States or of any Federal Home Loan
Bank.  Freddie Macs entitle the holder to timely  payment of interest,  which is
guaranteed  by FHLMC.  FHLMC  guarantees  either  ultimate  collection or timely
payment of all principal  payments on the underlying  mortgage loans. When FHLMC
does not guarantee  timely payment of principal,  FHLMC may remit the amount due
on account of its  guarantee of ultimate  payment of principal at any time after
default on an underlying mortgage,  but in no event later than one year after it
becomes payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and Federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support  payments on these  securities.

Supranational Bank Obligations

         The Diversified Assets,  Municipal and Tax-Exempt Portfolios may invest
in obligations of supranational  banks.  Supranational  banks are  international
banking  institutions  designed or supported by national  governments to promote
economic   reconstruction,   development  or  trade  among  nations  (e.g.,  the
International  Bank  for   Reconstruction   and  Development).   Obligations  of
supranational  banks may be supported by appropriated but unpaid  commitments of
their member countries and there is no assurance that these  commitments will be
undertaken or met in the future.

U.S. Government Obligations

         Examples  of the  types  of U.S.  Government  obligations  that  may be
acquired by the  Portfolios  include U.S.  Treasury  Bills,  Treasury  Notes and
Treasury  Bonds and the  obligations  of Federal  Home Loan Banks,  Federal Farm
Credit Banks,  Federal Land Banks, the Federal Housing  Administration,  Farmers
Home  Administration,  Export-Import  Bank of the United States,  Small Business
Administration,  Federal  National  Mortgage  Association  ("FNMA"),  Government
National Mortgage Association ("GNMA"), General Services Administration, Central
Bank for Cooperatives, Federal Home Loan Mortgage Corporation ("FHLMC"), Federal
Intermediate Credit Banks, and the Maritime Administration.

         Securities  guaranteed  as  to  principal  and  interest  by  the  U.S.
Government,  its  agencies or  instrumentalities  are also deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of credit  issued by the U.S.  Government  or any  agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         To the extent consistent with its investment objectives, the Portfolios
may invest in a variety of US. Treasury obligations and obligations issued by or
guaranteed by the U.S. Government or its agencies and instrumentalities. Not all
U.S.  Government  obligations carry the same credit support. No assurance can be
given that the U.S.  Government would provide  financial support to its agencies
or  instrumentalities  if it is  not  obligated  to do so by  law.  There  is no
assurance  that these  commitments  will be  undertaken  or complied with in the
future.  In addition,  the secondary market for certain  participations in loans
made to foreign governments or their agencies may be limited.

Custodial Receipts for Treasury Securities

         The Portfolios (other than the Government Select Portfolio) may acquire
U.S. Government  obligations and their unmatured interest coupons that have been
separated ("stripped") by their holder, typically a custodian bank or investment
brokerage  firm.  Having  separated  the interest  coupons  from the  underlying
principal  of the U.S.  Government  obligations,  the  holder  will  resell  the
stripped  securities  in custodial  receipt  programs with a number of different
names, including "Treasury Income Growth Receipts" ("TIGRs") and "Certificate of
Accrual  on  Treasury  Securities"  ("CATS").  The  stripped  coupons  are  sold
separately  from  the  underlying  principal,  which is  usually  sold at a deep
discount  because the buyer  receives  only the right to receive a future  fixed
payment on the  security  and does not receive  any rights to periodic  interest
(cash)  payments.  The underlying U.S.  Treasury bonds and notes  themselves are
held in  book-entry  form at the Federal  Reserve Bank or, in the case of bearer
securities  (i.e.,  unregistered  securities  which are ostensibly  owned by the
bearer or holder), in trust on behalf of the owners. Counsel to the underwriters
of  these  certificates  or  other  evidences  of  ownership  of  U.S.  Treasury
securities  have stated  that,  in their  opinion,  purchasers  of the  stripped
securities  most likely will be deemed the beneficial  holders of the underlying
U.S.  Government  obligations for Federal tax purposes.  The Trust is unaware of
any binding legislative, judicial or administrative authority on this issue.

U.S. Treasury STRIPS

         The Treasury Department has facilitated  transfers of ownership of zero
coupon  securities  by accounting  separately  for the  beneficial  ownership of
particular interest coupon and principal payments on Treasury securities through
the Federal  Reserve  book-entry  record-keeping  system.  The  Federal  Reserve
program as  established  by the  Treasury  Department  is known as  "STRIPS"  or
"Separate Trading of Registered Interest and Principal of Securities." Under the
STRIPS  program,  a Portfolio will be able to have its  beneficial  ownership of
zero coupon securities recorded directly in the book-entry record-keeping system
in lieu of having to hold  certificates  or other  evidences of ownership of the
underlying U.S. Treasury  securities.  All Portfolios,  including the Government
Select Portfolio, may acquire securities registered under the STRIPS program.

Bank and Deposit Notes

         The Diversified  Assets and Municipal  Portfolios may purchase bank and
deposit notes.  Bank notes rank junior to deposit  liabilities of banks and pari
passu with  other  senior,  unsecured  obligations  of the bank.  Bank notes are
classified as "other  borrowings" on a bank's balance sheet, while deposit notes
and  certificates  of deposit are  classified  as  deposits.  Bank notes are not
insured by the  Federal  Deposit  Insurance  Corporation  or any other  insurer.
Deposit notes are insured by the Federal Deposit  Insurance  Corporation only to
the extent of $100,000 per depositor per bank.

Variable and Floating Rate Instruments

         With respect to the variable and floating rate  instruments that may be
acquired by the  Portfolios  as  described  in the  Prospectus,  Northern  Trust
Company  (the  "Investment  Adviser" or  "Northern")  will  consider the earning
power,  cash flows and other  liquidity  ratios of the issuers and guarantors of
such instruments  and, if the instruments are subject to demand  features,  will
monitor  their  financial  status and ability to meet  payment on demand.  Where
necessary  to ensure  that a variable or floating  rate  instrument  is of "high
quality," the issuer's obligation to pay the principal of the instrument will be
backed  by an  unconditional  bank  letter  or  line  of  credit,  guarantee  or
commitment  to lend.  The  Portfolios  will invest in variable and floating rate
instruments  only when Northern deems the  investment to involve  minimal credit
risk.  Unrated  variable and floating  rate  instruments  will be  determined by
Northern  to be of  comparable  quality  at the  time of the  purchase  to rated
instruments  that may be purchased by the  Portfolios.  In determining  weighted
average  portfolio  maturity,  an instrument may,  subject to the Securities and
Exchange  Commission's  (the  "SEC")  regulations,  be deemed to have a maturity
shorter than its nominal  maturity based on the period  remaining until the next
interest rate adjustment or the time the Portfolio  involved can recover payment
of  principal  as  specified  in the  instrument.  Variable  and  floating  rate
instruments  eligible  for purchase by the  Portfolio  include  variable  amount
master demand notes, which permit the indebtness  thereunder to vary in addition
to providing for periodic adjustments in the interest rate.

         Variable  and floating  rate  instruments  held by a Portfolio  will be
subject to the Portfolio's limitation on illiquid investments when the Portfolio
may not demand  payment  of the  principal  amount  within  seven days  absent a
reliable trading market.

Investment Companies

         With respect to the  investments of the Portfolios in the securities of
other  investment  companies,  such  investments  will be  limited  so that,  as
determined  after a purchase  is made,  either (a) not more than 3% of the total
outstanding stock of such investment  company will be owned by a Portfolio,  the
Trust as a whole and their  affiliated  persons (as defined in the 1940 Act), or
(b)(i) not more than 5% of the value of the total assets of a Portfolio  will be
invested in the securities of any one investment company; (ii) not more than 10%
of the value of its total assets will be invested in the aggregate in securities
of  investment  companies  as a  group;  and  (iii)  not  more  than  3% of  the
outstanding  voting  stock of any one  investment  company  will be owned by the
Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolios may not be obligated to redeem such securities in an amount exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.

     If required by the 1940 Act, each  Portfolio  expects to vote the shares of
other  investment  companies  that are held by it in the same  proportion as the
vote of all other holders of such securities.

         A  Portfolio  may  invest all or  substantially  all of its assets in a
single open-end investment company or series thereof with substantially the same
investment objective,  policies and restrictions as the Portfolio. However, each
Portfolio  currently  intends to limit its  investments in securities  issued by
other investment companies to the extent described above. A Portfolio may adhere
to more  restrictive  limitations  with respect to its investments in securities
issued by other  investment  companies if required by the SEC or deemed to be in
the best interests of the Trust.

Repurchase Agreements

         Each  Portfolio  may  agree  to  purchase  portfolio   securities  from
financial institutions subject to the seller's agreement to repurchase them at a
mutually  agreed  upon  date and  price  ("repurchase  agreements").  Repurchase
agreements  are  considered  loans  under the 1940 Act.  Securities  subject  to
repurchase agreements are held either by the Trust's custodian (or subcustodian,
if any), or in the Federal Reserve/Treasury  Book-Entry System. The seller under
a repurchase  agreement will be required to maintain the value of the securities
subject to the agreement in an amount  exceeding the repurchase price (including
accrued interest). Default by the seller would, however, expose the Portfolio to
possible loss because of adverse  market action or delay in connection  with the
disposition of the underlying obligations.


Reverse Repurchase Agreements

         Each Portfolio  (except the  Tax-Exempt  Portfolio) may borrow funds by
selling  portfolio  securities  to  financial  institutions  such as  banks  and
broker/dealers  and agreeing to repurchase them at a mutually specified date and
price ("reverse repurchase agreements").  The Portfolios may use the proceeds of
reverse repurchase  agreements to purchase other securities either maturing,  or
under  an  agreement  to  resell,  at a date  simultaneous  with or prior to the
expiration of the reverse repurchase  agreement.  Reverse repurchase  agreements
involve the risk that the market value of the securities sold by a Portfolio may
decline below the repurchase  price. The Portfolios will pay interest on amounts
obtained pursuant to a reverse  repurchase  agreement.  While reverse repurchase
agreements  are  outstanding,  a Portfolio  will  segregate  liquid assets in an
amount  at least  equal to the  market  value of the  securities,  plus  accrued
interest, subject to the agreement. Reverse repurchase agreements are considered
to be borrowings under the 1940 Act.

Securities Lending

         Collateral  for loans of portfolio  securities  made by a Portfolio may
consist of cash, cash  equivalents,  securities issued or guaranteed by the U.S.
Government  or its  agencies  or  irrevocable  bank  letters  of credit  (or any
combination  thereof).  The borrower of securities  will be required to maintain
the market  value of the  collateral  at not less than the  market  value of the
loaned  securities,  and such value will be monitored  on a daily basis.  When a
Portfolio lends its securities,  it continues to receive  dividends and interest
on the securities loaned and may simultaneously  earn interest on the investment
of the cash collateral.  Although voting rights, or rights to consent, attendant
to securities  on loan pass to the  borrower,  such loans will be called so that
the  securities  may be voted by a Portfolio if a material  event  affecting the
investment is to occur.

 Forward Commitments and When-Issued Securities

         Each  Portfolio  may  purchase  securities  on a  when-issued  basis or
purchase or sell securities on a forward  commitment  (sometimes  called delayed
delivery)  basis.  These  transactions  involve a commitment by the Portfolio to
purchase  or sell  securities  at a future  date.  The  price of the  underlying
securities  (usually  expressed  in  terms  of  yield)  and the  date  when  the
securities will be delivered and paid for (the settlement date) are fixed at the
time the transaction is negotiated. When-issued purchases and forward commitment
transactions are normally negotiated directly with the other party.

         A Portfolio will purchase securities on a when-issued basis or purchase
or sell  securities  on a forward  commitment  basis only with the  intention of
completing the transaction and actually purchasing or selling the securities. If
deemed advisable as a matter of investment  strategy,  however,  a Portfolio may
dispose of or negotiate a commitment  after  entering into it. A Portfolio  also
may sell  securities it has committed to purchase  before those  securities  are
delivered to the Portfolio on the  settlement  date. The Portfolio may realize a
capital gain or loss in connection with these transactions.


         When a  Portfolio  purchases  securities  on a  when-issued  or forward
commitment  basis,  the Portfolio  will  segregate  liquid assets having a value
(determined  daily) at least  equal to the  amount of the  Portfolio's  purchase
commitments  until three days prior to the settlement  date, or otherwise  cover
its position.  These  procedures  are designed to ensure that the Portfolio will
maintain  sufficient  assets  at  all  times  to  cover  its  obligations  under
when-issued  purchases,  forward commitments and delayed-delivery  transactions.
For purposes of determining a Portfolio's average dollar-weighted  maturity, the
maturity of when-issued or forward commitment securities will be calculated from
the commitment date.

 Insurance Funding Agreements

         The  Diversified  Assets  Portfolio  may  invest in  insurance  funding
agreements  ("IFAs").  An IFA is  normally a general  obligation  of the issuing
insurance company and not a separate account. The purchase price paid for an IFA
becomes part of the general assets of the insurance company, and the contract is
paid from the company's  general assets.  Generally,  IFAs are not assignable or
transferable without the permission of the issuing insurance  companies,  and an
active secondary market in IFAs may not exist.

Yields and Ratings

         The  yields  on  certain   obligations,   including  the  money  market
instruments  in which the Portfolios  invest (such as commercial  paper and bank
obligations),  are dependent on a variety of factors, including general economic
conditions,  conditions in the particular  market for the obligation,  financial
condition of the issuer,  size of the offering,  maturity of the  obligation and
ratings of the issue. The ratings of S&P, Moody's,  D&P, Fitch and TBW represent
their respective opinions as to the quality of the obligations they undertake to
rate. Ratings,  however,  are general and are not absolute standards of quality.
Consequently,  obligations with the same rating,  maturity and interest rate may
have different  market prices.  For a more complete  discussion of ratings,  see
Appendix A to this document.

         Subject to the limitations stated in the Prospectus, if a security held
by the Portfolio  undergoes a rating  revision,  the  Portfolios may continue to
hold the  security  if the  Investment  Adviser  determines  such  retention  is
warranted.

Municipal Instruments

         Municipal  instruments are high quality,  short-term  instruments,  the
interest on which is, in the opinion of bond counsel to the issuers, exempt from
Federal income tax. Opinions  relating to the validity of municipal  instruments
and to Federal and state tax issues relating to these securities are rendered by
bond counsel to the respective issuing authorities at the time of issuance. Such
opinions may contain various assumptions,  qualifications or exceptions that are
reasonably  acceptable  to the  Investment  Adviser.  Neither  the Trust nor the
Investment  Adviser  will review the  proceedings  relating  to the  issuance of
municipal instruments or the bases for such opinions.

     Municipal  instruments  include both  "general" and "revenue"  obligations.
General obligations are secured by the issuer's pledge of its full faith, credit
and taxing power for the payment of principal and interest.  Revenue obligations
are payable only from the revenues  derived from a particular  facility or class
of facilities  or, in some cases,  from the proceeds of a special  excise tax or
other specific  revenue  source such as lease revenue  payments from the user of
the facility  being  financed.  Industrial  development  bonds are in most cases
revenue  securities  and are not payable from the  unrestricted  revenues of the
issuer.  Consequently,  the credit  quality  of an  industrial  revenue  bond is
usually  directly  related to the credit  standing  of the  private  user of the
facility involved.

         Industrial  development bonds are in most cases revenue  securities and
are not payable from the unrestricted revenues of the issuer. Consequently,  the
credit quality of an industrial  revenue bond is usually directly related to the
credit standing of the private user of the facility involved.

     Within the principal  classifications  of municipal  instruments  described
above there are a variety of categories,  including  municipal bonds,  municipal
notes,  municipal leases,  custodial  receipts and  participation  certificates.
Municipal  notes  include  tax,  revenue  and bond  anticipation  notes of short
maturity,  generally less than three years, which are issued to obtain temporary
funds  for  various  public  purposes.   Municipal   leases  and   participation
certificates  are  obligations   issued  by  state  and  local   governments  or
authorities   to  finance  the   acquisition   of  equipment   and   facilities.
Participation   certificates   may  represent   participation  in  a  lease,  an
installment  purchase  contract,  or  a  conditional  sales  contract.   Certain
municipal lease obligations (and related participation certificates) may include
"non-appropriation"   clauses  which  provide  that  the   municipality  has  no
obligation to make lease or installment purchase payments in future years unless
money is appropriated for such purpose on a yearly basis. Custodial receipts are
underwritten  by  securities  dealers or banks and evidence  ownership of future
interest payments,  principal payments or both on certain municipal  securities.
Municipal  leases (and  participations  in such leases)  present the risk that a
municipality will not appropriate  funds for the lease payments.  The Investment
Adviser, under the supervision of the Trust's Board of Trustees,  will determine
the  credit  quality  of any  unrated  municipal  leases  on an  ongoing  basis,
including an assessment of the likelihood that the leases will not be cancelled.

         The  Tax-Exempt  and  Municipal  Portfolios  may also  invest in "moral
obligation"   bonds,  which  are  normally  issued  by  special  purpose  public
authorities. If the issuer of a moral obligation bond is unable to meet its debt
service  obligations  from current  revenues,  it may draw on a reserve fund (if
such a  fund  has  been  established),  the  restoration  of  which  is a  moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

         Municipal  bonds  with a series of  maturity  dates are  called  Serial
Bonds. The Tax-Exempt  Portfolio and the Municipal Portfolio may purchase Serial
Bonds and  other  long-term  securities  provided  that  they  have a  remaining
maturity meeting the Portfolios' maturity requirements.  The Portfolios may also
purchase  long-term  variable and floating rate bonds (sometimes  referred to as
"Put Bonds")  where the  Portfolios  obtain at the time of purchase the right to
put the bond back to the issuer or a third party at par at least every  thirteen
months. Put Bonds with conditional puts (that is, puts which cannot be exercised
if the issuer defaults on its payment  obligations)  will present risks that are
different than those of other municipal  instruments  because of the possibility
that the  Portfolios  might hold  long-term  Put Bonds on which  defaults  occur
following acquisition by the Portfolios.

         Municipal   instruments  purchased  by  the  Tax-Exempt  Portfolio  and
Municipal  Portfolio may be backed by letters of credit or other forms of credit
enhancement  issued by foreign (as well as domestic)  banks and other  financial
institutions.  The credit  quality  of these  banks and  financial  institutions
could,  therefore,   cause  loss  to  a  Portfolio  that  invests  in  municipal
instruments.  Letters  of credit  and other  obligations  of  foreign  financial
institutions  may  involve  certain  risks in  addition  to  those  of  domestic
obligations.

         The  Tax-Exempt  Portfolio  may invest in fixed and variable rate notes
and  similar  debt  instruments  rated  MIG-2,  VMIG-2 or  Prime-2  or higher by
Moody's,  SP-2 or A-2 or higher by S&P,  AA or higher by D&P or F-2 or higher by
Fitch and tax-exempt commercial paper and similar debt instruments rated Prime-2
or higher  by  Moody's,  A-2 or higher by S&P,  D&P 2 or higher by D&P or F-2 or
higher by Fitch.  The Tax-Exempt  Portfolio may also invest in rated and unrated
municipal  bonds,  notes,  paper or  other  instruments  that are of  comparable
quality to the  tax-exempt  commercial  paper  permitted  to be purchased by the
Portfolio.

         The  Tax-Exempt  Portfolio  may  acquire  securities  in  the  form  of
custodial  receipts  evidencing  rights to  receive a specific  future  interest
payment,  principal  payment  or both on  certain  municipal  obligations.  Such
obligations  are held in  custody  by a bank on  behalf  of the  holders  of the
receipts.  These  custodial  receipts  are  known by  various  names,  including
"Municipal   Receipts,"   "Municipal   Certificates  of  Accrual  on  Tax-Exempt
Securities"  ("M-CATS") and "Municipal  Zero-Coupon Receipts." The Portfolio may
also purchase  certificates of participation  that, in the opinion of counsel to
the  issuer,  are exempt  from  regular  Federal  income  tax.  Certificates  of
participation are a type of floating or variable rate obligation that represents
interests in a pool of municipal obligations held by a bank.

         An issuer's obligations under its municipal  instruments are subject to
the provisions of bankruptcy, insolvency and other laws affecting the rights and
remedies of creditors,  such as the Federal  Bankruptcy  Code, and laws, if any,
which may be enacted by Federal  or state  legislatures  extending  the time for
payment of principal or interest,  or both, or imposing other  constraints  upon
enforcement of such  obligations or upon the ability of  municipalities  to levy
taxes. The power or ability of an issuer to meet its obligations for the payment
of interest on and  principal of its  municipal  instruments  may be  materially
adversely affected by litigation or other conditions.

         From time to time proposals have been  introduced  before  Congress for
the purpose of restricting  or eliminating  the Federal income tax exemption for
interest on municipal instruments. For example, under the Tax Reform Act of 1986
interest on certain  private  activity  bonds must be included in an  investor's
Federal alternative minimum taxable income, and corporate investors must include
all tax-exempt interest in their Federal alternative minimum taxable income. The
Trust cannot predict what legislation,  if any, may be proposed in the future in
Congress  as regards the  Federal  income tax status of  interest  on  municipal
instruments or which  proposals,  if any, might be enacted.  Such proposals,  if
enacted,  might  materially and adversely  affect the  availability of municipal
instruments for investment by the Tax-Exempt and Municipal  Portfolios and their
liquidity and value. In such an event the Board of Trustees would reevaluate the
Portfolio's  investment  objective  and  policies  and  consider  changes in its
structure or possible dissolution.

         As a matter of fundamental  policy,  at least 80% of the Tax-Exempt and
Municipal  Portfolios'  net  assets,  respectively,  will  be  invested  in debt
instruments, the interest on which is, in the opinion of bond counsel or counsel
for  issuers,  if any,  exempt  from  regular  Federal  income  tax,  except  in
extraordinary  circumstances  such as when the Investment  Adviser believes that
market  conditions  indicate  that  the  Portfolios  should  adopt  a  temporary
defensive   posture  by  holding   uninvested  cash  or  investment  in  taxable
securities,  except under extraordinary circumstances.  Taxable investments will
consist  exclusively  of  instruments  that may be purchased by the  Diversified
Assets  Portfolio.  The risks associated with these investments are described in
the Prospectus.

         Interest earned by the Tax-Exempt  Portfolio on private  activity bonds
(if any) that is treated as a specific  tax  preference  item under the  Federal
alternative  minimum tax will not be deemed to have been derived from  municipal
instruments  for  purposes  of  determining  whether  that  Portfolio  meets its
fundamental policy that at least 80% of its net assets be derived from municipal
instruments.

         Certain of the  municipal  instruments  held by the  Municipal  and the
Tax-Exempt  Portfolios  may be insured as to the timely payment of principal and
interest.  The insurance  policies will usually be obtained by the issuer of the
Municipal Instrument at the time of its original issuance. In the event that the
issuer  defaults on an  interest  or  principal  payment,  the  insurer  will be
notified  and will be required to make  payment to the bond  holders.  There is,
however,  no guarantee that the insurer will meet its obligations.  In addition,
such insurance will not protect against market fluctuations caused by changes in
interest rates and other factors. The Portfolios may invest more than 25% of its
total assets in municipal instruments covered by insurance policies.

         As described in the Prospectus, the Municipal and Tax-Exempt Portfolios
may invest in municipal leases,  which may be considered liquid under guidelines
established by the Trust's Board of Trustees.  The  guidelines  will provide for
determination  of the liquidity of a municipal lease obligation based on factors
including  the  following:  (1) the  frequency  of  trades  and  quotes  for the
obligation;  (2) the number of dealers  willing to purchase or sell the security
and the number of other  potential  buyers;  (3) the  willingness  of dealers to
undertake  to  make  a  market  in the  security;  and  (4)  the  nature  of the
marketplace  trades,  including the time needed to dispose of the security,  the
method of  soliciting  offers and the  mechanics  of  transfer.  The  Investment
Adviser,  under the  supervision  of the Trust's  Board of  Trustees,  will also
consider  marketability of a municipal lease  obligations based upon an analysis
of the general credit quality of the municipality issuing the obligation and the
essentiality to the municipality of the property covered by the lease.

     Currently,  it is not the  intention of the  Portfolios to invest more than
25% of the value of their total assets in Municipal  Instruments  whose  issuers
are in the
same state.


Standby Commitments

         The  Tax-Exempt  and  Municipal   Portfolios  may  enter  into  standby
commitments with respect to municipal  instruments  held by them,  respectively.
Under a standby  commitment,  a dealer  agrees to  purchase  at the  Portfolio's
option a specified Municipal Instrument.  Standby commitments may be exercisable
by the  Tax-Exempt  and Municipal  Portfolios at any time before the maturity of
the underlying  municipal  instruments and may be sold,  transferred or assigned
only with the instruments involved.

         The Tax-Exempt and Municipal Portfolios expect that standby commitments
will  generally  be  available  without  the  payment of any direct or  indirect
consideration.  However, if necessary or advisable, the Tax-Exempt and Municipal
Portfolios  may pay for a standby  commitment  either  separately  in cash or by
paying a higher price for Municipal  Instruments  which are acquired  subject to
the commitment (thus reducing the yield to maturity otherwise  available for the
same securities). The total amount paid in either manner for outstanding standby
commitments  held  either  Portfolio  will not exceed 1/2 of 1% of the value the
Portfolio's total assets calculated immediately after each standby commitment is
acquired.

         The  Tax-Exempt and Municipal  Portfolios  intend to enter into standby
commitments only with dealers, banks and broker-dealers which, in the Investment
Adviser's  opinion,  present minimal credit risks.  The Tax-Exempt and Municipal
Portfolios  will acquire  standby  commitments  solely to  facilitate  portfolio
liquidity  and do not intend to exercise  their  rights  thereunder  for trading
purposes.  The acquisition of a standby commitment will not affect the valuation
of the underlying  Municipal  Instrument.  The actual standby commitment will be
valued at zero in determining net asset value. Accordingly, where the Tax-Exempt
and Municipal  Portfolios pay directly or indirectly  for a standby  commitment,
the  Portfolios'  costs will be reflected as an  unrealized  loss for the period
during which the commitment is held by the  Tax-Exempt and Municipal  Portfolios
and will be reflected in realized gain or loss when the  commitment is exercised
or expires.

Illiquid or Restricted Securities

         Each  Portfolio  may invest up to 10% of its net  assets in  securities
that are illiquid.  The Portfolios may purchase commercial paper issued pursuant
to Section 4(2) of the 1933 Act and securities that are not registered under the
1933 Act but can be sold to "qualified  institutional buyers" in accordance with
Rule 144A under the 1933 Act. These  securities will not be considered  illiquid
so long as the Investment Adviser  determines,  under guidelines approved by the
Trust's Board of Trustees, that an adequate trading market exists. This practice
could  increase  the level of  illiquidity  during  any  period  that  qualified
institutional  buyers become  uninterested in purchasing these securities.
Investment Restrictions

         Each Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below which may be changed with  respect to a  particular  Portfolio
only by a vote of the  holders of a  majority  of such  Portfolio's  outstanding
shares.

No Portfolio may:

          (1)  Make loans,  except for (a) the purchase of debt  obligations  in
               accordance   with  the  Portfolio's   investment   objective  and
               policies, (b) repurchase agreements with banks, brokers,  dealers
               and other financial institutions, (c) loans of securities and (d)
               loans to affiliates  of the portfolio to the extent  permitted by
               law.

          (2)  Purchase or sell real estate or securities  issued by real estate
               investment  trusts,  but this  restriction  shall  not  prevent a
               Portfolio  from  investing  directly or  indirectly  in portfolio
               instruments secured by real estate or interests therein.

          (3)  Purchase or sell commodities or commodity contracts,  except that
               a Portfolio may invest in currency and financial  instruments and
               contracts that are commodities or commodity contracts.

          (4)  Invest in  companies  for the  purpose of  exercising  control or
               management.

          (5)  Act as  underwriter  of securities  (except as a Portfolio may be
               deemed to be an  underwriter  under the Securities Act of 1933 in
               connection with the purchase and sale of portfolio instruments in
               accordance with its investment objective and portfolio management
               policies).

          (6)  Make   any   investment   inconsistent   with   the   Portfolio's
               classification as a diversified investment company under the 1940
               Act.

          (7)  Purchase securities if such purchase would cause more than 25% in
               the  aggregate  of the  market  value of the  total  assets  of a
               Portfolio to be invested in the securities of one or more issuers
               having their principal business  activities in the same industry,
               provided  that there is no  limitation  with respect to, and each
               Portfolio reserves freedom of action,  when otherwise  consistent
               with its investment  policies,  to concentrate its investments in
               obligations  issued or  guaranteed  by the U.S.  Government,  its
               agencies or instrumentalities, obligations (other than commercial
               paper) issued or guaranteed  by U.S.  banks and U.S.  branches of
               foreign banks and  repurchase  agreements  and  securities  loans
               collateralized by such U.S.  Government  obligations or such bank
               obligations.  For the  purpose  of this  restriction,  state  and
               municipal  governments and their agencies and authorities are not
               deemed  to be  industries;  as to  utility  companies,  the  gas,
               electric,  water and telephone businesses are considered separate
               industries; personal credit finance companies and business credit
               finance  companies  are  deemed to be  separate  industries;  and
               wholly-owned  finance  companies  are  considered  to be  in  the
               industries  of their  parents if their  activities  are primarily
               related to financing the activities of their parents.

          (8)  Borrow money,  except that to the extent  permitted by applicable
               law (a) the  Portfolios may borrow from banks,  other  affiliated
               investment companies and other persons, and may engage in reverse
               repurchase   agreements  and  other  transactions  which  involve
               borrowings,  in  amounts  up to  33-1/3%  of their  total  assets
               (including the amount  borrowed) or such percentage  permitted by
               law (b) the Portfolios may borrow up to an additional 5% of their
               total  assets for  temporary  purposes,  (c) the  Portfolios  may
               obtain  such  short-term  credits  as may be  necessary  for  the
               clearance of purchases and sales of portfolio securities, and (d)
               the  Portfolios  may  purchase  securities  on margin.  If due to
               market  fluctuations or other reasons the Portfolios'  borrowings
               exceed the  limitations  stated  above,  the Trust will  promptly
               reduce the  borrowings of such  Portfolio in accordance  with the
               1940 Act.  In  addition,  as a matter of  fundamental  policy,  a
               Portfolio  will not issue  senior  securities  to the extent such
               issuance would violate applicable law.

          (9)  Notwithstanding  any of the Trust's other fundamental  investment
               restrictions (including,  without limitation,  those restrictions
               relating to issuer  diversification,  industry  concentration and
               control),  each  Portfolio  may (a) purchase  securities of other
               investment  companies to the full extent  permitted under Section
               12 of the 1940 Act (or any successor  provision thereto) or under
               any   regulation  or  order  of  the   Securities   and  Exchange
               Commission; and (b) invest all or substantially all of its assets
               in a single  open-end  investment  company or series thereof with
               substantially  the  same  investment   objective,   policies  and
               fundamental restrictions as the Portfolio.

                                      * * *


         The freedom of action  reserved in  Restriction  No. 7 with  respect to
U.S.  branches  of foreign  banks is subject  to the  requirement  that they are
subject to the same regulation as domestic  branches of U.S. banks.  Obligations
of U.S. branches of foreign banks may include certificates of deposit,  bank and
deposit notes,  bankers' acceptances and fixed time deposits.  These obligations
may be general  obligations  of the parent bank or may be limited to the issuing
branch.  Such  obligations  will meet the criteria for "Eligible  Securities" as
described in the Prospectus.

         Also,  as a matter  of  fundamental  policy,  changeable  only with the
approval  of  the  holders  of a  majority  of  the  outstanding  shares  of the
Tax-Exempt Portfolio and Municipal Portfolio,  at least 80% of the net assets of
the Portfolios will be invested in debt  instruments,  the interest on which is,
in the opinion of bond  counsel or counsel  for  issuers,  exempt  from  regular
Federal  income  tax,  except in  extraordinary  circumstances  such as when the
Investment Adviser believes that market conditions  indicate that the Portfolios
should  adopt a  temporary  defensive  posture  by  holding  uninvested  cash or
investing in taxable securities. Interest earned by the Tax-Exempt and Municipal
Portfolios  on  "private  activity  bonds"  that  is  treated  as an item of tax
preference  under  Federal  alternative  minimum tax will be deemed to be exempt
from  regular  Federal  income  tax for  purposes  of  determining  whether  the
Tax-Exempt and Municipal Portfolios meet this fundamental policy.

         Securities  held in escrow or separate  accounts in connection with the
Municipal   Portfolio's   investment  practices  described  in  this  Additional
Statement  and in the  Prospectus  are not  deemed to be  mortgaged,  pledged or
hypothecated for purposes of the foregoing Investment Restrictions.


         Except to the extent otherwise  provided in Investment  Restriction No.
7, for the purpose of such  restriction in determining  industry  classification
the Trust  intends to use the industry  classification  titles in the  Bloomberg
Industry Group Classifications.

     In applying  Restriction No. 7 above, a security is considered to be issued
by the entity,  or  entities,  whose assets and revenues  back the  security.  A
guarantee of a security is not deemed to be a security  issued by the  guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by a Portfolio,  does not exceed 10% of the value of the Portfolio's total
assets.

         Any  restriction  which  involves  a  maximum  percentage  will  not be
considered  violated  unless an excess over the  percentage  occurs  immediately
after,  and is caused by, an  acquisition or encumbrance of securities or assets
of, or borrowings by, a Portfolio.

         The Portfolios intend, as a non-fundamental  policy, to diversify their
investments  in  accordance  with current SEC  regulations.  Investments  in the
securities of any single issuer (excluding cash, cash items,  certain repurchase
agreements,  U.S.  Government  securities  and  securities  of other  investment
companies)  will be  limited  to not more than 5% of the value of a  Portfolio's
total assets at the time of purchase,  except that 25% of the value of the total
assets of each Portfolio may be invested in the securities of any one issuer for
a period of up to three  Business  Days.  A security  that has an  unconditional
guarantee  meeting special SEC  requirements  (a  "Guarantee")  does not need to
satisfy the foregoing issuer  diversification  requirements that would otherwise
apply,  but the Guarantee is instead  subject to the  following  diversification
requirements: immediately after the acquisition of the security, a Portfolio may
not have invested  more than 10% of its total assets in securities  issued by or
subject to Guarantees from the same person, except that a Portfolio may, subject
to certain conditions, invest up to 25% of its total assets in securities issued
or subject to  Guarantees  of the same person.  This  percentage  is 100% if the
Guarantee is issued by the U.S.  Government or an agency  thereof.  In addition,
the Tax-Exempt and Municipal  Portfolios will limit their investments in certain
conduit  securities that are not rated in the highest short-term rating category
as determined by two  nationally  recognized  statistical  rating  organizations
(each an "NRSRO")  (or one NRSRO if the security is rated by only one NRSRO) or,
if unrated, are not of comparable quality to First Tier Securities ("Second Tier
Securities"), to 5% of its total assets, with investments in any one such issuer
being limited to no more than 1% of the Portfolio's  total assets or $1 million,
whichever  is greater,  measured  at the time of  purchase.  Conduit  securities
subject to this limitation are municipal  instruments  that are not subject to a
Guarantee and involve an arrangement whereunder a person, other than a municipal
issuer, provides for or secures repayment of the security and are not: (i) fully
and  unconditionally  guaranteed by a municipal issuer; or (ii) payable from the
general  revenues of the municipal issuer or other municipal  issuers;  or (iii)
related to a project owned and operated by a municipal  issuer;  or (iv) related
to a facility  leased to and under the control of an  industrial  or  commercial
enterprise  that is part of a public  project  which,  as a whole,  is owned and
under the control of a municipal issuer.  The Diversified  Assets Portfolio will
limit its investments in all Second Tier  Securities  (that are not subject to a
Guarantee) in accordance with the foregoing percentage limitations.

         In addition to the  foregoing,  each Portfolio is subject to additional
diversification  requirements  imposed by SEC  regulations on the acquisition of
securities subject to other types of demand features.

ADDITIONAL TRUST INFORMATION

Trustees and Officers

         The  business and affairs of the Trust and each  Portfolio  are managed
under the direction of the Trust's Board of Trustees.  Information pertaining to
the Trustees and officers of the Trust is set forth below.



<PAGE>

<TABLE>
<CAPTION>
<S>                                    <C>          <C>              <C>

Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Stephen Timbers                        55****       Chairman and     President of Northern Trust Global
                                                    Trustee          Investments, a division of Northern Trust
                                                                     Corporation since 1998; President, Chief
                                                                     Executive Officer and Director of Zurich
                                                                     Kemper Investments from 1996 to 1998;
                                                                     President and Chief Operating Officer of
                                                                     Kemper Corporation from 1992 to 1996;
                                                                     President and Director Kemper Funds from 1990
                                                                     to 1998.  Director: LTV Corporation. Trustee:
                                                                     Northern Funds.


<PAGE>





Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Mr. Wesley M. Dixon, Jr.               72           Trustee          Director of Earl Kinship Capital Corporation
400 Skokie Blvd., Suite 300                                          since 1985, Vice Chairman and Director of G.D.
Northbrook, Illinois  60062                                          Searle & Co. (manufacture and sale of food
                                                                     products and pharmaceuticals) from 1977 to
                                                                     1983 and President of G.D. Searle & Co. prior
                                                                     thereto.  Trustee: Northern Funds.

Mr. William J. Dolan, Jr.              67           Trustee          Partner of Arthur Andersen & Co. S.C.
1534 Basswood Circle                                                 (accounting firm) from 1966 until his
Glenview, Illinois  60025                                            retirement in December 1989.  Financial
                                                                     Consultant, Ernst & Young from 1992 to 1993
                                                                     and 1997. Director: Household Bank, First
                                                                     Central National Life Insurance Company and
                                                                     Director of First Central National Life
                                                                     Insurance Company since July 1998.  Trustee:
                                                                     Northern Funds.

Mr. Raymond E. George, Jr.             69*          Trustee          Senior Vice President and Senior Fiduciary
703 Prospect Avenue                                                  Officer of The Northern Trust Company from
Winnetka, Illinois  60093                                            1990 until his retirement in October 1993.
                                                                     Trustee: Northern Funds.

Mr. Michael E. Murphy                  63**         Trustee          President of Sara Lee Foundation since
Suite 2222                                                           November 1997.  Vice Chairman and Chief
20 South Clark Street                                                Administrative Officer of Sara Lee Corporation
Chicago, Illinois  60603                                             (consumer products) from November 1994 to
                                                                     October 1997; Vice Chairman and Chief
                                                                     Financial and Administrative Officer of Sara
                                                                     Lee Corporation from July 1993 to November
                                                                     1994. Director: Payless Shoe Source, Inc.,
                                                                     True North Communications, Inc., American
                                                                     General Corporation, GATX Corporation and
                                                                     Bassett Furniture Industries, Inc.  Trustee:
                                                                     Northern Funds.

Mary Jacobs Skinner, Esquire           42***        Trustee          Partner in the law firm of Sidley & Austin.
One First National Plaza                                             Trustee: Northern Funds.
Chicago, Illinois  06063


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

William H. Springer                    71           Trustee          Vice Chairman of Ameritech (a
701 Morningside Drive                                                telecommunications holding company) from
Lake Forest, IL 60045                                                February 1987 until his retirement in August
                                                                     1992; Vice Chairman, Chief Financial and
                                                                     Administrative Officer of Ameritech prior
                                                                     1987. Director of Walgreen Co. (a retail drug
                                                                     store business); Baker, Fentress & Co. (a
                                                                     closed-end, non-diversified management
                                                                     investment company). Trustee of Goldman Sachs
                                                                     Trust; Goldman Sachs Variable Insurance Trust.
                                                                     Trustee:  Northern Funds.

Richard G. Cline                       65           Trustee          Chairman, Hawthorne Investors, Inc. (a
4200 Commerce Court,                                                 management advisory services and private
Suite 300                                                            investment company) since January 1996;
Lisle, IL 60532                                                      Chairman, Hussman International, Inc. (a
                                                                     refrigeration company) since January 1998,
                                                                     Chairman and CEO of NICOR Inc. (a diversified
                                                                     public utility holding company) from 1986 to
                                                                     1995, and President, 1992-1993; Chairman,
                                                                     Federal Reserve Bank of Chicago from 1992 to
                                                                     1995; and Deputy Chairman from 1995 to 1996.
                                                                     Director: Whitman Corporation (a diversified
                                                                     holding company), Kmart Corporation (a
                                                                     retailing company), Ryerson Tull, Inc. (a
                                                                     metals distribution company) and University of
                                                                     Illinois Foundation. Trustee:  Northern Funds.


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Edward J. Condon, Jr.                  60           Trustee          Chairman of The Paradigm Group, Ltd. (a
Sears Tower, Suite 9650                                              financial advisor) since July 1993; Vice
233 S. Wacker Drive                                                  President and Treasurer of Sears, Roebuck and
Chicago, IL 60606                                                    Co. (retail corporation) from February 1989 to
                                                                     July 1993; Member of Advisory Board of
                                                                     Real-Time USA, Inc. (a software company);
                                                                     Member of the Board of Managers of The Liberty
                                                                     Hampshire Company, LLC (a receivable
                                                                     securitization company); Vice Chairman and
                                                                     Director of Energenics L.L.C. Director:
                                                                     University Eldercare, Inc.; Financial Pacific
                                                                     Company Trustee: Dominican University.
                                                                     Trustee:  Northern Funds.

John W. English                        67           Trustee          Private Investor; Vice President and Chief
50-H New England Ave.                                                Investment Officer of The Ford Foundation (a
P.O. Box 640                                                         charitable trust) from 1981 to 1993.  Trustee:
Summit, NJ 07902-0640                                                The China Fund, Inc., Select Sector SPDR
                                                                     Trust; WM Funds; American Red Cross in Greater
                                                                     New York; Mote Marine Laboratory (a non-profit
                                                                     marine research facility); and United Board
                                                                     for Christian Higher Education in Asia.
                                                                     Director: University of Iowa Foundation,
                                                                     Blanton-Peale Institutes of Religion and
                                                                     Health; Community Foundation of Sarasota
                                                                     County; Duke Management Company (an investment
                                                                     adviser); and John Ringling Centre Foundation.
                                                                     Trustee:  Northern Funds.

Sandra Polk Guthman                    56           Trustee          President and CEO of Polk Bros. Foundation (an
420 N. Wabash Avenue                                                 Illinois not-for-profit corporation) from 1993
Suite 204                                                            to present; Director of Business
Chicago, IL 60611                                                    Transformation from 1992-1993, and Midwestern
                                                                     Director of Marketing from 1988-1992, IBM (a
                                                                     technology company); Director: MBIA Insurance
                                                                     Corporation of Illinois (bank holding
                                                                     company); MB Financial Corp. (a bank holding
                                                                     company). Trustee:  Northern Funds.

Richard P. Strubel                     61           Trustee          President and Chief Operating Officer,
737 N. Michigan Avenue                                               Unext.com since 1999; Managing Director of
Suite 1405                                                           Tandem Partners, Inc. (a privately held
Chicago, IL 60611                                                    management services firm) since 1990 to 1999;
                                                                     President and Chief Executive Officer,
                                                                     Microdot, Inc. (a privately held manufacturing
                                                                     firm) from 1984 to 1994; Director: Gildan
                                                                     Activewear, Inc.; Children's Memorial Medical
                                                                     Center. Trustee:  University of Chicago;
                                                                     Goldman Sachs Trust; Goldman Sachs Variable
                                                                     Insurance Trust. Trustee:  Northern Funds.

Jylanne M. Dunne                       40           President        Senior Vice President for Distribution
4400 Computer Drive                                                  Services at PFPC Inc. ("PFPC") (formerly First
Westborough, MA 01581                                                Data Investor Services Group, Inc. ("FDISG"))
                                                                     (since 1988).

Richard H. Rose                        44           Vice President   Vice President and Division Manager of Mutual
4400 Computer Drive                                                  Fund Administration at PFPC (formerly FDISG)
Westborough, MA 01581                                                (since 1994).

Brian R. Curran                        32           Treasurer        Director of Fund Administration at PFPC
4400 Computer Drive                                                  (formerly FDISG) (since 1997); Director of
Westborough, MA 01581                                                Fund Administration at State Street Bank &
                                                                     Trust
                                                                     Company
                                                                     (February
                                                                     1997     to
                                                                     October
                                                                     1997);
                                                                     Senior
                                                                     Auditor  at
                                                                     Price
                                                                     Waterhouse
                                                                     L.L.P.
                                                                     (February
                                                                     1994     to
                                                                     February
                                                                     1997).


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Judith E. Clear                        33           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC since 1997; Compliance
Westborough, MA 01581                                                Manager at Citizens Trust from 1994 to 1996.

Suzanne E. Anderson                    27           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC Inc. (since August
Westborough, MA 01581                                                1998); Manager of Fund Administration at State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1996     to
                                                                     August
                                                                     1998); Fund
                                                                     Administrator
                                                                     at    State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1995     to
                                                                     October
                                                                     1996);
                                                                     Mutual Fund
                                                                     Accountant
                                                                     at      The
                                                                     Boston
                                                                     Company
                                                                     (prior
                                                                     thereto).

Linda J. Hoard                         52           Secretary        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                                  1998); Attorney Consultant for Fidelity
Westborough, MA 01581                                                Management & Research (a financial service
                                                                     company);
                                                                     Investors
                                                                     Bank      &
                                                                     Trust
                                                                     Company  (a
                                                                     financial
                                                                     service
                                                                     provider)
                                                                     and   FDISG
                                                                     (September
                                                                     1994     to
                                                                     June 1998).

Teresa M.R. Hamlin                     35           Assistant        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                 Secretary        1994).
Westborough, MA 01581

Therese Hogan                          37           Assistant        Director of the State Regulation Department at
4400 Computer Drive                                 Secretary        PFPC (formerly FDISG) (since 1994).
Westborough, MA 01581

     * Mr. George is deemed to be an "interested" Trustee because he owns shares
of Northern  Trust  Corporation.  ** Mr. Murphy is deemed to be an  "interested"
Trustee because he owns shares of Northern Trust Corporation. *** Ms. Skinner is
deemed  to be an  "interested"  Trustee  because  her law  firm  provides  legal
services  to Northern  Trust  Corporation.  **** Mr.  Timbers is deemed to be an
"interested"  Trustee  because  he  is  an  officer,   director,   employee  and
shareholder of Northern Trust Corporation.

</TABLE>


         Certain of the Trustees and officers and the  organizations  with which
they  are  associated  have  had  in the  past,  and  may  have  in the  future,
transactions with Northern,  PFPC (formerly FDISG), Northern Funds Distributors,
LLC ("NFD"), and their respective affiliates. The Trust has been advised by such
Trustees and officers that all such  transactions  have been and are expected to
be in the  ordinary  course  of  business  and the  terms of such  transactions,
including  all loans and loan  commitments  by such  persons,  have been and are
expected to be  substantially  the same as the  prevailing  terms for comparable
transactions for other customers. As a result of the responsibilities assumed by
Northern under its Advisory  Agreement,  Transfer  Agency  Agreement,  Custodian
Agreement,  Foreign Custody Agreement and  Co-Administration  Agreement with the
Trust, by PFPC under its  Co-Administration  Agreement with the Trust and by NFD
under its  Distribution  Agreement with the Trust,  the Trust itself requires no
employees.

         Each officer holds  comparable  positions with certain other investment
companies of which NFD, PFPC or an affiliate thereof is the investment  adviser,
administrator and/or distributor.

         Additionally,   the  Trust,   its  investment   adviser  and  principal
underwriter  have  adopted  codes of ethics (the  "Codes of Ethics")  under rule
17j-1 of the 1940 Act.  The Codes of Ethics  permit  personnel,  subject  to the
Codes of  Ethics  and their  provisions,  to  invest  in  securities,  including
securities that may be purchased or held by the Trust.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In  addition,   the  Trustees  have   established  an  Audit  Committee
consisting  of two  members  including a Chairman  of the  Committee.  The Audit
Committee members are Messrs. Condon and Strubel (Chairman). Each member earns a
fee of $2,500 for each  meeting  attended  and the  Chairman  earns a  quarterly
retainer of $1,500.

     Each Trustee will hold office for an indefinite  term until the earliest of
(1) the  next  meeting  of  shareholders,  if any,  called  for the  purpose  of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust, or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

     The Trust's  officers do not  receive  fees from the Trust for  services in
such capacities,  although PFPC, of which they are also officers,  receives fees
from the Trust for administrative services.


     The  following  table sets forth  certain  information  with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1999:



<PAGE>



<TABLE>
<CAPTION>
<S>                            <C>            <C>              <C>            <C>          <C>              <C>

                                                                                                            Total
                                 Government                     Diversified                                 Compensation
                                   Select        Government        Assets     Municipal      Tax-Exempt     from Fund
                                  Portfolio       Portfolio      Portfolio    Portfolio***       Portfolio     Complex

Stephen B. Timbers**            0              0                0             n/a          0                0
William H. Springer             7,950          6,890            19,610        n/a          3,180            53,000
Richard G. Cline                5,925          5,135            14,615        n/a          2,370            44,500
Edward J. Condon, Jr.           6,675          5,785            16,465        n/a          2,670            39,500
John W. English                 5,925          5,135            14,615        n/a          2,370            39,500
Sandra Polk Guthman             5,925          5,135            14,615        n/a          2,370            39,500
Frederick T. Kelsey*            6,675          5,785            16,465        n/a          2,670            44,500
Richard P. Strubel              7,575          6,565            18,685        n/a          3,030            50,500
Wesley M. Dixon, Jr.**          0              0                0             n/a          0                22,500
William J. Dolan, Jr.**         0              0                0             n/a          0                22,500
Raymond E. George, Jr.**        0              0                0             n/a          0                21,250
Michael E. Murphy**             0              0                0             n/a          0                22,500
Mary Jacobs Skinner**           0              0                0             n/a          0                22,500
</TABLE>

* Frederick Kelsey retired from the Board of Trustees on November 30, 1999

** Not a Trustee of the  Northern  Institutional  Funds  during the period ended
November 30, 1999.

*** Municipal Portfolio did not commence operations during the period.

The Trust does not provide pension or retirement benefits to its Trustees.

Investment Adviser, Transfer Agent and Custodian

         Northern  Trust Company (the  "Investment  Adviser" or  "Northern"),  a
wholly-owned  subsidiary of Northern Trust Corporation,  a bank holding company,
is one of the  nation's  leading  providers of trust and  investment  management
services.  As of December 31, 1999,  Northern and its affiliates had over $299.1
billion in assets  under  management  for clients  including  public and private
retirement   funds,   endowments,   foundations,   trusts,   corporations,   and
individuals.  Northern  is one of the  strongest  banking  organizations  in the
United  States.  Northern  believes  it has built its  organization  by  serving
clients with integrity,  a commitment to quality,  and personal  attention.  Its
stated  mission  with respect to all its  financial  products and services is to
achieve unrivaled client  satisfaction.  With respect to such clients, the Trust
is designed to assist (i) defined contribution plan sponsors and their employees
by  offering a range of diverse  investment  options to help  comply with 404(c)
regulation and may also provide  educational  material to their employees,  (ii)
employers  who  provide  post-retirement   Employees'  Beneficiary  Associations
("VEBA")  and  require  investments  that  respond  to  the  impact  of  Federal
regulations,  (iii)  insurance  companies  with  the  day-to-day  management  of
uninvested cash balances as well as with longer-term  investment needs, and (iv)
charitable and not-for-profit organizations, such as endowments and foundations,
demanding  investment  management  solutions  that balance the  requirement  for
sufficient  current income to meet  operating  expenses and the need for capital
appreciation to meet future investment objectives.

         Northern  employs a team approach to the  investment  management of the
Portfolios,  relying upon investment professionals under the leadership of James
M. Snyder, Chief Investment Officer and Executive Vice President of Northern.

         Under its Advisory Agreement with the Trust,  Northern,  subject to the
general supervision of the Trust's Board of Trustees,  is responsible for making
investment decisions for each Portfolio and placing purchase and sale orders for
the portfolio  transactions  of the  Portfolios.  In connection  with  portfolio
transactions for the Portfolios, which are generally done at a net price without
a broker's  commission,  Northern's  Advisory  Agreement  provides that Northern
shall attempt to obtain the best net price and execution.

         Northern's  investment  advisory  duties for the Trust are  carried out
through its Trust  Department.  On occasions when Northern deems the purchase or
sale of a security to be in the best  interests  of a Portfolio as well as other
fiduciary  or agency  accounts  managed by it  (including  any other  Portfolio,
investment  company  or  account  for  which  Northern  acts  as  adviser),  the
Investment Advisory Agreement provides that Northern, to the extent permitted by
applicable  laws and  regulations,  may aggregate  the  securities to be sold or
purchased for such  Portfolio  with those to be sold or purchased for such other
accounts  in order to  obtain  best net  price  and  execution.  In such  event,
allocation  of the  securities  so  purchased  or sold,  as well as the expenses
incurred in the transaction, will be made by Northern in the manner it considers
to be most  equitable  and  consistent  with its  fiduciary  obligations  to the
Portfolio and other accounts  involved.  In some  instances,  this procedure may
adversely  affect the size of the  position  obtainable  for a Portfolio  or the
amount of the securities that are able to be sold for a Portfolio. To the extent
that the execution and price  available  from more than one broker or dealer are
believed to be comparable,  the Investment  Advisory Agreement permits Northern,
at its discretion but subject to applicable law, to select the executing  broker
or dealer on the basis of Northern's  opinion of the  reliability and quality of
such broker or dealer.

         The  Advisory  Agreement  provides  that  Northern  may render  similar
services to others so long as its services under such Agreement are not impaired
thereby.  The Advisory  Agreement  also provides  that the Trust will  indemnify
Northern against certain  liabilities  (including  liabilities under the Federal
securities laws relating to untrue  statements or omissions of material fact and
actions  that are in  accordance  with the terms of the  Agreement)  or, in lieu
thereof, contribute to resulting losses.

         Under its  Transfer  Agency  Agreement  with the  Trust,  Northern  has
undertaken to (1) answer customer inquiries  regarding the current yield of, and
certain other matters  (e.g.  account  status  information)  pertaining  to, the
Trust, (2) process purchase and redemption transactions,  including transactions
generated by any service  provided  outside of the  Agreement  by Northern,  its
affiliates or  correspondent  banks whereby  customer  account cash balances are
automatically invested in shares of the Portfolios,  and the disbursement of the
proceeds of redemptions,  (3) establish and maintain  separate  omnibus accounts
with respect to shareholders investing through Northern or any of its affiliates
and  correspondent  banks and act as transfer  agent and perform  sub-accounting
services  with respect to each such  account,  (4) provide  periodic  statements
showing account balances,  (5) mail reports and proxy materials to shareholders,
(6) provide  information  in  connection  with the  preparation  by the Trust of
various  regulatory  reports and prepare reports to the Trustees and management,
(7) answer  inquiries  (including  requests for  prospectuses  and statements of
additional  information,  and  assistance  in  the  completion  of  new  account
applications)  from  investors  and  respond  to all  requests  for  information
regarding the Trust (such as current price, recent performance,  and yield data)
and  questions  relating to accounts of  investors  (such as possible  errors in
statements, and transactions), (8) respond to and seek to resolve all complaints
of investors  with  respect to the Trust or their  accounts,  (9) furnish  proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution and tax notices to investors, (10) furnish the Trust all
pertinent Blue Sky information,  (11) perform all required tax withholding, (12)
preserve  records,  and (13) furnish  necessary  office  space,  facilities  and
personnel.  Northern  may  appoint  one  or  more  sub-transfer  agents  in  the
performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement  with  respect  to  the  Shares  described  in  this
Additional  Statement  and the  assumption  by  Northern  of  related  expenses,
Northern  is  entitled  to a fee from the Trust,  calculated  daily and  payable
monthly,  at an annual  rate equal to $18 for each  subaccount  relating to such
Shares of the Portfolios. This fee which is borne solely by the Shares described
in this Additional  Statement and not by the Portfolios' other share classes, is
subject to annual upward  adjustments  based on increases in the Consumer  Price
Index for All  Urban  Consumers,  provided  that  Northern  may  permanently  or
temporarily  waive  all  or any  portion  of any  upward  adjustment.  Different
transfer agency fees are payable with respect to the Portfolios' different share
classes.  Northern's affiliates and correspondent banks may receive compensation
for performing the services  described in the preceding  paragraph that Northern
would  otherwise  receive.  Conflict-of-interest  restrictions  under  state and
Federal law (including the Employee  Retirement Income Security Act of 1974) may
apply  to the  receipt  by  such  affiliates  or  correspondent  banks  of  such
compensation  in connection  with the investment of fiduciary funds in Shares of
the Portfolios.

         Under its Custodian  Agreement with the Trust,  Northern (1) holds each
Portfolio's  cash and  securities,  (2)  maintains  such cash and  securities in
separate  accounts  in the  name  of  the  Portfolio,  (3)  makes  receipts  and
disbursements  of funds on behalf of the Portfolio,  (4) receives,  delivers and
releases  securities on behalf of the  Portfolio,  (5) collects and receives all
income,  principal and other payments in respect of the  Portfolio's  securities
held by Northern under the Custodian Agreement, and (6) maintains the accounting
records of the Trust.  Northern may employ one or more  subcustodians,  provided
that Northern,  subject to certain  monitoring  responsibilities,  shall have no
more  responsibility  or  liability  to the Trust on  account  of any  action or
omission of any subcustodian so employed than such  subcustodian has to Northern
and that the  responsibility  or liability of the subcustodian to Northern shall
conform  to  the  resolution  of  the  Trustees  of the  Trust  authorizing  the
appointment of the particular subcustodian.  Northern may also appoint agents to
carry out such of the provisions of the Custodian Agreement as Northern may from
time to time direct, provided that the appointment of an agent shall not relieve
Northern of any of its responsibilities under the Agreement.

     As  compensation  for the  services  rendered  to the Trust by  Northern as
custodian, and the assumption by Northern of certain related expenses,  Northern
is entitled to payment from the Trust as follows:  (i) $18,000 annually for each
Portfolio,  plus (ii) 1/100th of 1% annually of each  Portfolio's  average daily
net assets to the extent they exceed $100 million, plus (iii) a fixed dollar fee
for each trade in  portfolio  securities,  plus (iv) a fixed dollar fee for each
time that Northern as custodian  receives or transmits  funds via wire, plus (v)
reimbursement  of expenses  incurred by Northern  as  custodian  for  telephone,
postage, courier fees, office supplies and duplicating.  The fees referred to in
clauses  (iii)  and (iv) are  subject  to  annual  upward  adjustments  based on
increases in the Consumer  Price Index for All Urban  Consumers,  provided  that
Northern may  permanently or temporarily  waive all or any portion of any upward
adjustment.

     Northern's  fees under the  Custodian  Agreement  are subject to  reduction
based on the Portfolios' daily uninvested cash balances (if any).


     Unless sooner terminated,  each of the Advisory Agreement,  Transfer Agency
Agreement and Custodian  Agreement  between Northern and the Trust will continue
in effect with  respect to a  particular  Portfolio  until April 30,  2000,  and
thereafter for successive  12-month  periods,  provided that the  continuance is
approved at least annually (1) by the vote of a majority of the Trustees who are
not parties to the agreement or "interested persons" (as such term is defined in
the 1940 Act) of any party  thereto,  cast in person at a meeting called for the
purpose of voting on such  approval  and (2) by the Trustees or by the vote of a
majority of the  outstanding  shares of such  Portfolio  (as defined below under
"Other  Information").  Each agreement is terminable at any time without penalty
by the Trust (by specified  Trustee or  shareholder  action) on 60 days' written
notice to Northern and by Northern on 60 days' written notice to the Trust.


         For the fiscal  years  ended  November 30 as  indicated,  the amount of
advisory fees incurred by each Portfolio (except Municipal Portfolio,  which did
not commence operations during the period) (after fee waivers) was as follows:


<TABLE>
<CAPTION>
<S>                                                     <C>                      <C>                 <C>

                                                                  1999                 1998                 1997

Government Select Portfolio                              $   1,551,000           $1,460,037          $ 1,018,270
Government Portfolio                                         3,589,000            3,337,292            3,243,435
Diversified Assets Portfolio                                13,142,000           10,271,332            8,945,126
Tax-Exempt Portfolio                                         1,502,000            1,712,721            1,731,407
</TABLE>


     In addition,  for the fiscal years ended November 30, 1999,  1998 and 1997,
Northern waived advisory fees with respect to the Government Select Portfolio in
the amounts of $2,786,104, $2,193,181 and $1,527,701, respectively.

         For the fiscal  years  ended  November 30 as  indicated,  the amount of
transfer  agency fees incurred by each Portfolio  (except  Municipal  Portfolio,
which did not commence operations during the period) was as follows:

 <TABLE>
<CAPTION>
<S>                                                        <C>                   <C>                  <C>
                                                              1999                  1998                 1997

Government Select Portfolio                                $   35,078            $ 28,041              $30,361
Government Portfolio                                           36,436              51,087               35,042
Diversified Assets Portfolio                                  153,309             182,267              127,270
Tax-Exempt Portfolio                                           22,320              28,191               22,028
</TABLE>



         For the fiscal  years  ended  November 30 as  indicated,  the amount of
custodian fees incurred by each Portfolio (except Municipal Portfolio, which did
not commence operations during the period) was as follows:
<TABLE>
<CAPTION>
<S>                                                         <C>                 <C>                    <C>

                                                                1999                  1998                1997

Government Select Portfolio                                  $  205,435          $ 181,920              $ 97,683
Government Portfolio                                            176,812            179,186               140,110
Diversified Assets Portfolio                                    577,833            425,371               412,075
Tax-Exempt Portfolio                                             90,540             86,026               100,513

</TABLE>




         Northern is active as an  underwriter of municipal  instruments.  Under
the 1940 Act, the Portfolios are precluded,  subject to certain exceptions, from
purchasing in the primary  market those  municipal  instruments  with respect to
which  Northern  is  serving  as a  principal  underwriter.  In the  opinion  of
Northern,  this  limitation  will not  significantly  affect the  ability of the
Portfolios to pursue their respective investment objectives.

         Under a Service  Mark  License  Agreement  (the  "Agreement")  with the
Trust,   Northern  Trust   Corporation   has  agreed  that  the  name  "Northern
Institutional  Funds" may be used in connection  with the Trust's  business on a
royalty-free basis.  Northern Trust Corporation has reserved to itself the right
to grant the non-exclusive right to use the name "Northern  Institutional Funds"
to any other person.  The Agreement  provides that at such time as the Agreement
is no  longer  in  effect,  the  Trust  will  cease  using  the  name  "Northern
Institutional Funds."

Portfolio Transactions

         For the fiscal  years  ended  November  30,  1999,  1998 and 1997,  all
portfolio  transactions  for the Portfolios  were executed on a principal  basis
and, therefore, no brokerage commissions were paid by the Portfolios.  Purchases
by the Portfolios from underwriters of portfolio securities,  however,  normally
include a commission or concession  paid by the issuer to the  underwriter,  and
purchases from dealers  include the spread between the dealer's cost for a given
security and the resale price of the security.

         During the fiscal year ended November 30, 1999, the Diversified  Assets
Portfolio acquired and sold securities of Bear Sterns & Co., Morgan Stanley Dean
Witter & Co.,  and  Lehman  Brothers,  Inc.,  each a regular  broker/dealer.  At
November 30, 1999, the Diversified  Assets Portfolio owned the following amounts
of securities of its regular broker/dealers,  as defined in Rule 10b-1 under the
1940  Act,  or  their  parents:  Morgan  Stanley  Dean  Witter  & Co.,  with  an
approximate aggregate market value of $36,619,000.

         During  the  fiscal  year  ended  November  30,  1999,  the  Government
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

     During the fiscal year ended  November  30,  1999,  the  Government  Select
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

         During  the  fiscal  year  ended  November  30,  1999,  the  Tax-Exempt
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

     During the fiscal year ended November 30, 1999, the Municipal Portfolio had
not yet commenced operations.

Co-Administrators and Distributor

         Effective  May 1,  1999,  Northern  and  PFPC  (formerly  FDISG),  4400
Computer Drive,  Westborough,  Massachusetts 01581, act as co-administrators for
the Portfolios under a  Co-Administration  Agreement with the Trust.  Subject to
the general  supervision  of the Trust's  Board of  Trustees,  Northern and PFPC
(formerly FDISG) (the "Co-Administrators") provide supervision of all aspects of
the Trust's  non-investment  advisory  operations and perform various  corporate
secretarial,  treasury and blue sky services,  including but not limited to: (a)
maintaining  office facilities and furnishing  corporate officers for the Trust;
(b) furnishing data processing  services,  clerical services,  and executive and
administrative  services  and  standard  stationery  and  office  supplies;  (c)
performing  all  functions  ordinarily  performed  by the office of a  corporate
treasurer,  and  furnishing  the services  and  facilities  ordinarily  incident
thereto,  such as expense  accrual  monitoring and payment of the Trust's bills,
preparing  monthly  reconciliation  of the  Trust's  expense  records,  updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  Federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to  their  customers  who are the  beneficial  owners  of  shares,  pursuant  to
servicing agreements between the Trust and such Servicing Agents.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators are entitled to a fee from each Portfolio,  computed daily and
payable  monthly,  at an annual rate of .10% of the average  daily net assets of
each  Portfolio.  The  Co-Administrators  will  reimburse each Portfolio for its
expenses (including  administration fees payable to the  Co-Administrators,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceed on an annualized basis .10% of each  Portfolio's  average
daily net assets.

         For the period May 1, 1999,  through the fiscal year ended November 30,
1999,   PFPC   (formerly   FDISG)  and  Northern   received   fees  under  their
co-administration  agreement with the Trust (after fee waivers)  (except for the
Municipal Portfolio, which did not commence operations during the period) in the
amount of:

                                                            May 1, 1999 -
                                                          November 30, 1999


Government Select Portfolio                                $  786,966
Government Portfolio                                          670,580
Diversified Assets Portfolio                                2,747,512
Tax-Exempt Portfolio                                          193,364


         Prior to May 1, 1999, Goldman,  Sachs & Co. ("Goldman Sachs"), 85 Broad
Street, New York, New York 10004, acted as the Trust's administrator pursuant to
an  administration  agreement  substantially  similar  to the  Co-Administration
Agreement  currently in effect with Northern and PFPC (formerly FDISG).  For the
fiscal years ended  November 30 as indicated,  Goldman Sachs received fees under
its  administration  agreement  with the Trust (after fee waivers) in the amount
of:


<TABLE>
<CAPTION>
<S>                                         <C>                          <C>                    <C>

                                            December 1, 1998
                                            through April 30, 1999          1998                    1997

Government Select Portfolio                     $  524,613               $1,460,037              $1,048,482
Government Portfolio                               390,578                1,334,907               1,208,401
Diversified Assets Portfolio                     1,317,956                4,108,503               3,082,370
Tax-Exempt Portfolio                               195,956                  685,084                 749,232
</TABLE>



     In addition,  pursuant to an  undertaking  that  commenced  August 1, 1992,
Goldman  Sachs  had  agreed  that,  if its  administration  fees  (less  expense
reimbursements  paid by Goldman  Sachs to the Trust and less  certain  marketing
expenses paid by Goldman  Sachs)  exceed a specified  amount ($1 million for the
Trust's  first twelve  investment  portfolios  plus $50,000 for each  additional
portfolio)  during the current fiscal year,  Goldman Sachs would waive a portion
of its  administration  fees during the  following  fiscal  year.  There were no
waivers by Goldman Sachs pursuant to this agreement during the last three fiscal
years.

         Prior to  April 1,  1998,  Goldman  Sachs  had  voluntarily  agreed  to
reimburse  each  Portfolio for its expenses  (including  fees payable to Goldman
Sachs as  administrator,  but  excluding  the fees  payable to Northern  for its
duties as investment  adviser and  extraordinary  expenses) which exceeded on an
annualized basis .10% of each Portfolio's average daily net assets.

         For the fiscal  years  ended  November 30 as  indicated,  the effect of
these  reimbursements  by  Goldman  Sachs was to reduce  other  expenses  by the
following amounts:

<TABLE>
<CAPTION>
<S>                                             <C>                            <C>                           <C>

                                                 December 1,
                                                 1998 through
                                                April 30, 1999                 1998                             1997

Government Select Portfolio                                                     $544,124                      $360,250
Government Portfolio                                                              606,764                      262,895
Diversified Assets Portfolio                                                    1,328,789                      477,791
Tax-Exempt Portfolio                                                              279,774                      305,530
</TABLE>



         Effective April 1, 1998,  (upon the offering of the Service and Premier
Shares),  Goldman  Sachs had  agreed to  reimburse  expenses  of each  Portfolio
(including  fees payable to Goldman  Sachs as  administrator,  but excluding the
fees payable to Northern for its duties as adviser and transfer agent,  payments
under the service plan for Service and Premier Shares, and certain extraordinary
expenses) which exceed on an annualized basis .10% of each  Portfolio's  average
daily net assets.

         Unless  sooner  terminated,   the  Co-Administration   Agreement  among
Northern,  PFPC and the Trust will continue in effect until April 30, 2001,  and
thereafter  for  successive  one-year  terms  with  respect  to each  Portfolio,
provided that the Agreement is approved annually (1) by the Board of Trustees or
(2) by the vote of a majority of the  outstanding  shares of such  Portfolio (as
defined  below under  "Other  Information"),  provided  that in either event the
continuance  is also  approved by a majority of the Trustees who are not parties
to the Agreement and who are not interested persons (as defined in the 1940 Act)
of any party thereto, by vote cast in person at a meeting called for the purpose
of voting on such approval. The Co-Administration Agreement is terminable at any
time  after  April 30,  2001,  without  penalty by the Trust on at least 60 days
written notice to the Co-Administrators. Each Co-Administrator may terminate the
Co-Administration  Agreement  with respect to itself at any time after April 30,
2001  without  penalty on at least 60 days  written  notice to the Trust and the
other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30, 2001 in the event that the Trust or its shareholders incur damages in excess
of $100,000 as a result of the willful  misfeasance,  bad faith or negligence of
the  Co-Administrators,  or the  reckless  disregard  of their  duties under the
Agreement. The Trust may also terminate the Co-Administration Agreement prior to
April 30, 2001 in the event that the  Co-Administrators  fail to meet one of the
performance standards set forth in the Agreement.

         The Trust has entered into a  Distribution  Agreement  with NFD,  under
which NFD, as agent,  sells shares of each Portfolio on a continuous  basis. NFD
pays the cost of printing and  distributing  prospectuses to persons who are not
shareholders of the Trust (excluding  preparation and typesetting  expenses) and
of certain other distribution  efforts.  No compensation is payable by the Trust
to NFD for such  distribution  services.  NFD is a  wholly-owned  subsidiary  of
Provident   Distributors,   Inc.  ("PDI").  PDI,  based  in  West  Conshohocken,
Pennsylvania, is an independently owned and operated broker-dealer.  Between May
1, 1999 and November 30, 1999, First Data  Distributors  Inc.  ("FDDI") acted as
the Trust's  distributor  pursuant  to a  distribution  agreement  substantially
similar to the Distribution Agreement currently in effect with NFD. Prior to May
1,  1999,  Goldman  Sachs  acted  as  the  Trust's  distributor  pursuant  to  a
distribution  agreement  substantially  similar  to the  Distribution  Agreement
currently in effect with NFD.


         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust  will  indemnify  NFD  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by NFD, or those resulting from the willful misfeasance, bad faith or negligence
of NFD, or NFD's breach of confidentiality.


         Under a Service Mark License  Agreement (the "License  Agreement") with
NFD,  Northern Trust  Corporation  agrees that the name "Northern  Institutional
Funds" may be used in connection with Northern  Institutional Funds' business on
a  royalty-free  basis.  Northern Trust  Corporation  has reserved to itself the
right to grant the non-exclusive right to use the name ("Northern  Institutional
Funds") to any other person. The License Agreement provides that at such time as
the  License  Agreement  is no longer in effect  NFD will  cease  using the name
"Northern Institutional Funds."

Counsel and Auditors

     Drinker  Biddle & Reath LLP,  with  offices at One Logan  Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.


         _________________,  independent auditors, 233 S. Wacker Drive, Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit  services,  _______________  reviews  the  Trust's  Federal  and state tax
returns,  and provides  consultation  and  assistance  on  accounting,  internal
control and related matters.

In-Kind Purchases and Redemptions

         Payment for shares of a Portfolio  may, in the  discretion of Northern,
be made in the form of  securities  that  are  permissible  investments  for the
Portfolio as described in the  Prospectus.  For further  information  about this
form of payment,  contact  Northern.  In connection  with an in-kind  securities
payment,  a Portfolio will require,  among other things,  that the securities be
valued on the day of purchase in accordance with the pricing methods used by the
Portfolio and that the Portfolio  receive  satisfactory  assurances that it will
have  good and  marketable  title to the  securities  received  by it;  that the
securities  be in proper form for transfer to the  Portfolio;  and that adequate
information be provided  concerning the basis and other tax matters  relating to
the securities.

         Although each  Portfolio  generally  will redeem  shares in cash,  each
Portfolio  reserves the right to pay  redemptions by a  distribution  in kind of
securities (instead of cash) from such Portfolio.  The securities distributed in
kind would be readily  marketable and would be valued for this purpose using the
same method  employed in calculating  the Portfolio's net asset value per share.
If a shareholder  receives  redemption  proceeds in kind, the shareholder should
expect  to incur  transaction  costs  upon  the  disposition  of the  securities
received in the redemption.

Third-Party Fees and Requirements

         Shares are sold and redeemed without any purchase or redemption  charge
imposed by the Trust,  although Northern and other institutions may charge their
customers for services provided in connection with their investments.

         The  exercise  of  voting  rights  and the  delivery  to  Customers  of
shareholder  communications  from the Trust will be governed  by the  Customers'
account  agreements with the Institutions.  Customers should read the Prospectus
in connection with any relevant agreement describing the services provided by an
Institution and any related requirements and charges, or contact the Institution
at which the Customer maintains its account for further information.

PERFORMANCE INFORMATION

         The  performance of a class of shares of a Portfolio may be compared to
those of other money market funds with similar  investment  objectives and other
relevant  indices or to  rankings  prepared  by  independent  services  or other
financial or industry publications that monitor the performance of mutual funds.
For  example,  the  performance  of a class of shares  may be  compared  to data
prepared by IBC Financial Data, Inc. or other independent  mutual fund reporting
services.  Performance data as reported in national financial  publications such
as Money Magazine,  Morningstar,  Forbes,  Barron's, The Wall Street Journal and
The New York Times, or in publications of a local or regional  nature,  may also
be used in comparing the performance of a class of shares of a Portfolio.

         From time to time,  the  Portfolios  may advertise  their  "yields" and
"effective yields," and the Government Select Portfolio, Municipal Portfolio and
Tax-Exempt   Portfolio  may   advertise   their   "tax-equivalent   yields"  and
"tax-equivalent effective yields." Yield, effective yield,  tax-equivalent yield
and  tax-equivalent  effective  yield are computed  separately for each class of
shares. Each class of shares has different fees and expenses,  and consequently,
may have  different  yields  for the  same  period.  These  yield  figures  will
fluctuate,  are based on  historical  earnings  and are not intended to indicate
future performance.  "Yield" refers to the net investment income generated by an
investment  in  the  Portfolio  over  a  seven-day  period   identified  in  the
advertisement.  This net investment  income is then  "annualized."  That is, the
amount of net investment  income generated by the investment during that week is
assumed  to be  generated  each  week over a  52-week  period  and is shown as a
percentage of the investment.

         In  arriving  at  such  quotations  as  to  "yield,"  the  Trust  first
determines the net change,  exclusive of capital  changes,  during the seven-day
period in the value of a hypothetical  pre-existing  account having a balance of
one Share at the  beginning  of the period,  then divides such net change by the
value of the  account at the  beginning  of the period to obtain the base period
return, and then multiplies the base period return by 365/7.

         "Effective yield" is calculated similarly but, when annualized, the net
investment  income  earned by an  investment  in the  Portfolio is assumed to be
reinvested.  The  "effective  yield"  will be  slightly  higher than the "yield"
because of the compounding effect of this assumed  reinvestment.  The "effective
yield" with  respect to the Shares of a Portfolio is computed by adding 1 to the
base period return  (calculated  as above),  raising the sum to a power equal to
365 divided by 7, and subtracting 1 from the result.

         The  "tax-equivalent  yield"  demonstrates  the level of taxable  yield
necessary to produce an after-tax  yield  equivalent to a  Portfolio's  tax-free
yield. It is calculated by taking that portion of the seven-day "yield" which is
tax-exempt and adjusting it to reflect the tax savings  associated with a stated
tax rate.  The  "tax-equivalent  current  yield"  will always be higher than the
Portfolio's yield.

         "Tax-equivalent  yield" is computed by dividing the tax-exempt  portion
of the yield by 1 minus a stated  income tax rate,  and then adding the quotient
to the  taxable  portion  of the  yield,  if any.  There  may be more  than  one
tax-equivalent current yield, if more than one stated income tax rate is used.

         The "tax-equivalent  effective yield" demonstrates the level of taxable
yield  necessary  to produce an  after-tax  yield  equivalent  to a  Portfolio's
tax-free  effective  yield.  It is  calculated  by taking  that  portion  of the
seven-day  "effective yield" which is tax-exempt and adjusting it to reflect the
tax savings  associated  with a stated tax rate. The  "tax-equivalent  effective
yield" will always be higher than the Portfolio's effective yield.

         "Tax-equivalent effective yield" is computed by dividing the tax-exempt
portion of the  effective  yield by 1 minus a stated income  tax-rate,  and then
adding the quotient to the taxable portion of the effective yield, if any. There
may be more than one  tax-equivalent  effective  yield,  if more than one stated
income tax rate is used.

         Quotations of yield, effective yield,  tax-equivalent current yield and
tax-equivalent effective yield provided by the Trust are carried to at least the
nearest hundredth of one percent.  Any fees imposed by Northern,  its affiliates
or  correspondent  banks on their  customers in connection  with  investments in
Shares of the Portfolios are not reflected in the  calculation of yields for the
Portfolios.

         The annualized  yield of each Portfolio  (except  Municipal  Portfolio,
which did not commence  operations during the period) with respect to Shares for
the seven-day period ended November 30, 1999 was as follows 1:
<TABLE>
<CAPTION>
<S>                            <C>           <C>              <C>                     <C>

                                             Effective        Tax-Equivalent          Tax-Equivalent
                               Yield           Yield              Yield               Effective Yield

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
</TABLE>



         The information  set forth in the foregoing table reflects  certain fee
reductions  and  expense  limitations.   See  "Additional  Trust  Information  -
Co-Administrators  and Distributor" and "Investment Adviser,  Transfer Agent and
Custodian." In the absence of such fee reductions and expense  limitations,  the
annualized yield of each Portfolio  (except Municipal  Portfolio,  which did not
commence  operations  during  the  period)  with  respect to Shares for the same
seven-day period would have been as follows 2:

<TABLE>
<CAPTION>
<S><C>                            <C>        <C>              <C>                     <C>
                                             Effective        Tax-Equivalent          Tax-Equivalent
                                  Yield        Yield              Yield               Effective Yield


Government Select  Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
</TABLE>


         The Portfolios' yields may not provide a basis for comparison with bank
deposits and other  investments  which provide a fixed yield for a stated period
of time.  Each  Portfolio's  yields  fluctuate,  unlike  bank  deposits or other
investments  which  pay  a  fixed  yield  for  a  stated  period  of  time.  The
annualization  of one  week's  income is not  necessarily  indicative  of future
actual yields. Actual yields will depend on such variables as portfolio quality,
average portfolio maturity, the type of portfolio instruments acquired,  changes
in money market interest rates, portfolio expenses and other factors. Yields are
one basis  investors  may use to analyze a class of shares of the  Portfolio  as
compared to  comparable  classes of shares of other money market funds and other
investment  vehicles.  However,  yields of other  money  market  funds and other
investment  vehicles may not be comparable  because of the foregoing  variables,
and  differences  in the methods used in valuing  their  portfolio  instruments,
computing net asset value and determining yield.

     Each  Portfolio  may also quote  from time to time the total  return of its
Shares in accordance with SEC regulations.

         The yields  and total  returns of the  Portfolios'  Service  Shares and
Premier Shares are calculated  separately from the calculations of the yield and
total return of the Shares described in this Additional Statement.

                            AMORTIZED COST VALUATION

         As stated in the  Prospectus,  each  Portfolio  seeks to maintain a net
asset value of $1.00 per share and, in this  connection,  values its instruments
on the basis of amortized  cost  pursuant to Rule 2a-7 under the 1940 Act.  This
method  values a security  at its cost on the date of  purchase  and  thereafter
assumes  a  constant  amortization  to  maturity  of any  discount  or  premium,
regardless of the impact of  fluctuating  interest  rates on the market value of
the instrument. While this method provides certainty in valuation, it may result
in periods  during which value,  as determined  by amortized  cost, is higher or
lower  than the  price a  Portfolio  would  receive  if the  Portfolio  sold the
instrument.  During such  periods the yield to investors  in the  Portfolio  may
differ  somewhat  from that  obtained in a similar  entity which uses  available
indications as to market value to value its portfolio instruments.  For example,
if the use of amortized  cost resulted in a lower (higher)  aggregate  Portfolio
value on a particular day, a prospective investor in the Portfolio would be able
to obtain a somewhat  higher  (lower)  yield and  ownership  interest than would
result from  investment  in such  similar  entity and existing  investors  would
receive less (more) investment income and ownership interest. However, the Trust
expects  that  the  procedures  and  limitations  referred  to in the  following
paragraphs  of this section will tend to minimize  the  differences  referred to
above.

         Under Rule 2a-7,  the Trust's  Board of Trustees,  in  supervising  the
Trust's operations and delegating special  responsibilities  involving portfolio
management to Northern,  has established  procedures  that are intended,  taking
into  account  current  market   conditions  and  the   Portfolios'   investment
objectives,  to stabilize the net asset value of each Portfolio, as computed for
the purposes of purchases  and  redemptions,  at $1.00 per share.  The Trustees'
procedures  include  periodic  monitoring of the  difference  (the "Market Value
Difference")  between the amortized cost value per share and the net asset value
per  share  based  upon  available   indications  of  market  value.   Available
indications  of  market  value  used  by the  Trust  consist  of  actual  market
quotations or appropriate  substitutes  which reflect current market  conditions
and include (a) quotations or estimates of market value for individual portfolio
instruments and/or (b) values for individual portfolio  instruments derived from
market  quotations  relating to varying  maturities  of a class of money  market
instruments.  In the event the  Market  Value  Difference  of a given  Portfolio
exceeds certain limits or Northern believes that the Market Value Difference may
result in material  dilution or other  unfair  results to  investors or existing
shareholders, the Trust will take action in accordance with the 1940 Act and the
Trustees  will take  such  steps as they  consider  appropriate  (e.g.,  selling
portfolio  instruments  to  shorten  average  portfolio  maturity  or to realize
capital gains or losses,  reducing or suspending  shareholder  income  accruals,
redeeming  shares in kind or  utilizing  a net asset  value per share based upon
available  indications of market value which under such circumstances would vary
from $1.00) to  eliminate  or reduce to the extent  reasonably  practicable  any
material dilution or other unfair results to investors or existing  shareholders
which might arise from Market Value Differences.  In particular,  if losses were
sustained by a Portfolio,  the number of outstanding  shares might be reduced in
order to maintain a net asset value per share of $1.00.  Such reduction would be
effected  by  having  each   shareholder   proportionately   contribute  to  the
Portfolio's  capital the  necessary  shares to restore  such net asset value per
share.  Each shareholder  will be deemed to have agreed to such  contribution in
these circumstances by investing in the Portfolio.

         Rule  2a-7  requires  that each  Portfolio  limit  its  investments  to
instruments which Northern determines (pursuant to guidelines established by the
Board of  Trustees)  to present  minimal  credit  risks and which are  "Eligible
Securities" as defined by the SEC and described in the Prospectus. The Rule also
requires  that each  Portfolio  maintain  a  dollar-weighted  average  portfolio
maturity  (not more than 90 days)  appropriate  to its policy of  maintaining  a
stable net asset value per share and  precludes  the purchase of any  instrument
deemed  under the Rule to have a remaining  maturity  of more than 397  calendar
days. Should the disposition of a portfolio security result in a dollar-weighted
average  portfolio  maturity of more than 90 days, the Rule requires a Portfolio
to invest its available  cash in such a manner as to reduce such maturity to the
prescribed limit as soon as reasonably practicable.

                              DESCRIPTION OF SHARES

         The Trust  Agreement  permits the Trust's Board of Trustees to issue an
unlimited number of full and fractional shares of beneficial  interest of one or
more  separate  series   representing   interests  in  one  or  more  investment
portfolios.  The Trustees may hereafter create series in addition to the Trust's
twenty-one existing series,  which represent interests in the Trust's twenty-one
respective portfolios. The Trust Agreement also permits the Board of Trustees to
classify  or  reclassify  any  unissued  shares  into  classes  within a series.
Pursuant to such  authority,  the Trustees  have  authorized  the issuance of an
unlimited  number of shares of beneficial  interest in three separate classes of
shares in each of the  Portfolios:  Shares,  Service Shares and Premier  Shares.
This  Additional  Statement  (and the related  Prospectus)  relates  only to the
Shares of the five  Portfolios  discussed  herein.  For information on the other
share classes in each Portfolio and on the Trust's other investment  portfolios,
call the toll-free number on page 1.

         Under the terms of the Trust Agreement, each share of each Portfolio is
without par value,  represents an equal proportionate interest in the particular
Portfolio  with  each  other  share of its  class in the same  Portfolio  and is
entitled to such dividends and  distributions out of the income belonging to the
Portfolio as are declared by the Trustees.  Upon any liquidation of a Portfolio,
shareholders  of each class of a Portfolio are entitled to share pro rata in the
net assets  belonging to that class  available for  distribution.  Shares do not
have any preemptive or conversion  rights.  The right of redemption is described
under  "About  Your  Account - Selling  Shares and  Account  Policies  and Other
Information"  in the Prospectus  and under  "Amortized  Cost  Valuation" in this
Additional  Statement.  In addition,  pursuant to the terms of the 1940 Act, the
right of a  shareholder  to redeem shares and the date of payment by a Portfolio
may be  suspended  for more than seven days (a) for any period  during which the
New York  Stock  Exchange  is  closed,  other  than the  customary  weekends  or
holidays, or trading in the markets the Portfolio normally utilizes is closed or
is restricted as determined by the SEC, (b) during any emergency,  as determined
by the SEC,  as a  result  of which  it is not  reasonably  practicable  for the
Portfolio to dispose of instruments owned by it or fairly to determine the value
of its net assets,  or (c) for such other  period as the SEC may by order permit
for the  protection of the  shareholders  of the  Portfolio.  The Trust may also
suspend or  postpone  the  recordation  of the  transfer  of its shares upon the
occurrence  of any of the  foregoing  conditions.  In  addition,  shares of each
Portfolio are redeemable at the  unilateral  option of the Trust if the Trustees
determine in their sole  discretion  that failure to so redeem may have material
adverse consequences to the shareholders of the Portfolio. Shares when issued as
described in the Prospectus are validly  issued,  fully paid and  nonassessable,
except  as  stated  below.   In  the  interests  of  economy  and   convenience,
certificates representing Shares of the Portfolios are not issued.

         The proceeds  received by each  Portfolio for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of that Portfolio. The underlying assets
of each  Portfolio  will be  segregated  on the  books of  account,  and will be
charged with the  liabilities  in respect to that  Portfolio and with a share of
the general  liabilities  of the Trust.  Expenses with respect to the Portfolios
are normally  allocated in proportion  to the net asset value of the  respective
Portfolios  except where  allocations of direct expenses can otherwise be fairly
made.

         Rule 18f-2 under the 1940 Act provides  that any matter  required to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
each  Portfolio  affected  by the matter.  A  Portfolio  is affected by a matter
unless it is clear  that the  interests  of each  Portfolio  in the  matter  are
substantially  identical  or that the matter does not affect any interest of the
Portfolio.  Under the Rule, the approval of an investment  advisory agreement or
any change in a fundamental  investment  policy would be effectively  acted upon
with  respect to a Portfolio  only if approved by a majority of the  outstanding
shares of such Portfolio.  However, the Rule also provides that the ratification
of the  appointment  of  independent  accountants,  the  approval  of  principal
underwriting contracts and the election of Trustees are exempt from the separate
voting  requirements  stated  above.  In addition,  shareholders  of each of the
classes in a particular  investment  portfolio  have equal voting  rights except
that only  shares  of a  particular  class of an  investment  portfolio  will be
entitled  to vote  on  matters  submitted  to a vote of  shareholders  (if  any)
relating to  shareholder  servicing  expenses and transfer  agency fees that are
payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting power of the Trust may elect all of the Trustees irrespective of the vote
of the other shareholders.  Meetings of shareholders of the Trust, or any series
or class thereof,  may be called by the Trustees,  certain  officers or upon the
written request of holders of 10% or more of the shares entitled to vote at such
meeting. The shareholders of the Trust will have voting rights only with respect
to the limited number of matters specified in the Trust Agreement and such other
matters as the Trustees may  determine or may be required by law. The Trust does
not presently intend to hold annual meetings of shareholders  except as required
by the 1940 Act or other  applicable  law. The  Trustees  will  promptly  call a
meeting  of  shareholders  to vote  upon  the  removal  of any  Trustee  when so
requested  in writing by the  record  holders of 10% or more of the  outstanding
shares.  To the extent  required by law,  the Trust will  assist in  shareholder
communications in connection with such a meeting.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment:  (i) that would  adversely  affect the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust or any series or class thereof,  or affecting  assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless disregard of the duties involved in the conduct of his or her office.

         The Trust Agreement provides for indemnification of Trustees,  officers
and  agents of the Trust  unless  the  recipient  is liable by reason of willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's office.

         The  Trust  Agreement  provides  that  each  shareholder,  by virtue of
becoming such,  will be held to have expressly  assented and agreed to the terms
of the Trust Agreement and to have become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.

         As of December 31, 1999,  substantially all of the Trust's  Portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  Portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less  than 10% of the  Trust's  outstanding  shares.  As of the same  date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding shares of each class of each Portfolio.

     Northern has advised the Trust that the following  persons  (whose  mailing
address is: c/o The Northern Trust Company, 50 South LaSalle, Chicago, IL 60675)
beneficially  owned  five  percent  or more  of the  outstanding  shares  of the
Portfolios' classes as of December 31, 1999:


<TABLE>
<CAPTION>
<S><C>                                                                       <C>                     <C>
                                                                                Number               Percentage
                                                                              of Shares              of Shares
DIVERSIFIED ASSETS PORTFOLIO
         Shares
                  TNT-London FB                                              652,242,086.83           10.1%
                  MCCA-Western Asset Management                              338,063,609.18            5.2%
         Service Shares
                  Cole Taylor Bank                                             7,762,828.00           18.3%
                  First Mid-Illinois Bank & Trust                              5,414,728.00           12.8%
                  Merchants National Bank                                     15,275,235.00           36.1%
         Premier Shares
                  Riverview Community Bank                                     6,116,140.00          100.0%

                                                                                Number               Percentage
                                                                              of Shares              of Shares
GOVERNMENT PORTFOLIO
         Service Shares
                  Cole Taylor Bank                                            21,629,429.00           81.4%
                  Secured Trust                                                2,762,285.00           10.4%
         Premier Shares
                  Chitenden Bank                                              46,914,429.00          100.0%

                                                                                Number               Percentage
                                                                              of Shares              of Shares
GOVERNMENT SELECT PORTFOLIO
         Shares
                  TNT-London FBO Food & Agricultural                         168,749,428.00            8.4%
Organization
         Service Shares
                  Richfield Bank & Trust Co.                                   5,294,331.00           45.6%
         Premier Shares
                  Richfield Bank & Trust Co.                                   5,522,453.99           96.1%

                                                                                Number               Percentage
                                                                              of Shares              of Shares
TAX-EXEMPT PORTFOLIO
         Shares
                  Tisch                                                       47,260,209.28            9.3%
         Service Shares
                  Chitenden Bank.                                             27,742,350.00           75.3%
                  Merchants National Bank                                      8,694,855.00           23.6%
         Premier Shares
                  Richfield Bank & Trust Co.                                   5,522,453.99           96.1%
</TABLE>


                     ADDITIONAL INFORMATION CONCERNING TAXES

General

         Each  Portfolio  will  elect  to be  taxed  separately  as a  regulated
investment company (a "RIC"). To qualify as a RIC, each Portfolio generally must
distribute an amount equal to at least the sum of 90% of its investment  company
taxable  income  and 90% of its net  tax-exempt  interest  income  (if any) (net
investment  income  and the  excess  of net  short-term  capital  gain  over net
long-term capital loss), if any, for each year (the "Distribution  Requirement")
and satisfy certain other requirements.

         Each  Portfolio  must  derive  at least 90% of its  gross  income  from
dividends, interest, certain payments with respect to securities loans and gains
from the sale or other disposition of stock or securities or foreign currencies,
or from other  income  derived with respect to its business of investing in such
stock,  securities  or  currencies.  Also , at the close of each  quarter of the
taxable  year,  it is generally  required that at least 50% of the value of each
Portfolio's  assets  must  consist  of cash  and  cash  items,  U.S.  Government
securities,  securities  of other RICs and  securities  of other  issuers (as to
which  the  Portfolio  has not  invested  more than 5% of the value of its total
assets in securities of such issuer and as to which the Portfolio  does not hold
more than 10% of the outstanding voting securities of such issuer),  and no more
than 25% of the value of each  Portfolio's  total  assets may be invested in the
securities  of any  one  issuer  (other  than  U.S.  Government  securities  and
securities  of other  RICs),  or in two or more  issuers  which  such  Portfolio
controls and which are engaged in the same or similar trades or businesses. Each
Portfolio intends to comply with these RIC requirements.

         If for any taxable year any Portfolio were not to qualify as a RIC, all
of its taxable income would be subject to tax at regular corporate rates without
any  deduction  for   distributions   to   shareholders.   In  such  event,  all
distributions  by the  Portfolio  would be taxable to  shareholders  as ordinary
income to the extent of the  Portfolio's  current and  accumulated  earnings and
profits, and would be eligible for the dividends-received  deduction in the case
of corporate shareholders.

         The Internal Revenue Code imposes a nondeductible 4% excise tax on RICs
that fail  currently to distribute an amount equal to specified  percentages  of
their  ordinary  taxable  income and capital gain net income  (excess of capital
gains  over  capital  losses).   Each  Portfolio   intends  to  make  sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar year to avoid  liability for this excise tax. Each
Portfolio also intends to make sufficient  distributions or deemed distributions
each year to avoid  liability for corporate  income tax. If a Portfolio  were to
fail to make sufficient  distributions,  it could be liable for corporate income
tax and for excise tax.

         The Trust will be  required in certain  cases to withhold  and remit to
the U.S.  Treasury 31% of taxable  dividends and gross sale proceeds paid to any
shareholder (i) who has provided either an incorrect tax  identification  number
or no number at all, (ii) who is subject to backup  withholding  by the Internal
Revenue  Service  for  failure to report the  receipt  of  taxable  interest  or
dividend income properly,  or (iii) who has failed to certify to the Trust, when
required to do so, that he or she is not subject to backup  withholding  or that
he or she is an "exempt recipient."


Special Tax Considerations Pertaining to the Tax-Exempt and Municipal Portfolios

         Investors in either of Tax-Exempt and Municipal  Portfolios should note
that  taxpayers  are required to report the receipt of  tax-exempt  interest and
"exempt-interest  dividends" on their Federal income tax returns and that in two
circumstances  such amounts,  while exempt from regular  Federal income tax, are
taxable to persons  subject to  alternative  minimum  taxes.  First,  tax-exempt
interest and  "exempt-interest  dividends" derived from certain private activity
bonds issued  after  August 7, 1986  generally  will  constitute  an item of tax
preference for corporate and noncorporate  taxpayers in determining  alternative
minimum tax  liability.  Second,  all tax-exempt  interest and  "exempt-interest
dividends"  must be taken into  account by corporate  taxpayers  in  determining
certain adjustments for alternative minimum tax purposes.

     As described  above and in the  Prospectus,  the  Tax-Exempt  and Municipal
Portfolios are designed to provide investors with Federally  tax-exempt interest
income.


         Neither  the  Tax-Exempt  Portfolio  nor  the  Municipal  Portfolio  is
intended to  constitute  a balanced  investment  program and is not designed for
investors seeking capital appreciation or maximum tax-exempt income irrespective
of fluctuations in principal.  Shares of these  Portfolios would not be suitable
for tax-exempt  institutions or for retirement plans qualified under Section 401
of the Code, H.R.10 plans and individual  retirement accounts because such plans
and  accounts  are  generally  tax-exempt  and,  therefore,  would  not gain any
additional benefit from the Portfolio's dividends being tax-exempt. In addition,
the Portfolios may not be an appropriate investment for persons or entities that
are  "substantial  users" of facilities  financed by private  activity  bonds or
"related  persons"  thereof.  "Substantial  user" is defined under U.S. Treasury
Regulations to include a non-exempt  person which  regularly uses a part of such
facilities  in its trade or  business  and whose  gross  revenues  derived  with
respect to the facilities  financed by the issuance of bonds are more than 5% of
the total revenues  derived by all users of such  facilities,  or which occupies
more than 5% of the usable area of such  facilities or for which such facilities
or a part  thereof were  specifically  constructed,  reconstructed  or acquired.
"Related   persons"   include  certain  related  natural   persons,   affiliated
corporations,  partnerships  and  its  partners  and an S  corporation  and  its
shareholders.

     In  order  for the  Tax-Exempt  and  Municipal  Portfolios  to pay  Federal
exempt-interest dividends with respect to any taxable year, at the close of each
taxable  quarter  at least  50% of the  aggregate  value of the  Portfolio  must
consist of tax-exempt obligations.  An exempt-interest  dividend is any dividend
or part thereof  (other than a capital gain  dividend) paid by the Tax-Exempt or
Municipal Portfolios and designated as an exempt-interest  dividend in a written
notice  mailed to  shareholders  not later  than 60 days  after the close of the
Portfolio's  taxable  year.  However,  the  aggregate  amount  of  dividends  so
designated  by either  Portfolio  cannot  exceed  the  excess  of the  amount of
interest exempt from tax under Section 103 of the Code received by the Portfolio
during the taxable year over any amounts disallowed as deductions under Sections
265 and 171(a)(2) of the Code. The percentage of total dividends paid by each of
the Tax-Exempt and Municipal  Portfolios  with respect to any taxable year which
qualifies  as  Federal  exempt-interest  dividends  will  be the  same  for  all
shareholders receiving dividends from the Portfolio with respect to such year.

         Interest on indebtedness incurred by a shareholder to purchase or carry
shares of the  Tax-Exempt and Municipal  Portfolios  generally is not deductible
for   Federal   income   tax   purposes   to   the   extent    attributable   to
exempt-interest-dividends. If a shareholder holds either Tax-Exempt or Municipal
Portfolio  shares for six months or less,  any loss on the sale or  exchange  of
those shares will be disallowed  to the extent of the amount of  exempt-interest
dividends earned with respect to the shares. The Treasury  Department,  however,
is authorized to issue regulations reducing the six-month holding requirement to
a period of not less than the greater of 31 days or the period  between  regular
distributions for investment companies that regularly distribute at least 90% of
its net tax-exempt interest.  No such regulations had been issued as of the date
of this Additional Statement.

         The Tax-Exempt  and Municipal  Portfolios  will determine  annually the
percentages  of their net  investment  income  which is exempt  from tax,  which
constitute  an item of tax  preference  for purposes of the Federal  alternative
minimum  tax,  and which is fully  taxable,  and will  apply  these  percentages
uniformly to all dividends declared from net investment income during that year.
These percentages may differ  significantly  from the actual percentages for any
particular day.

         Shareholders  will be advised  annually  as to the  Federal  income tax
consequences of distributions made by the Tax-Exempt and Municipal Portfolios.

         Income  from the  Tax-Exempt  Portfolio  may not be  tax-exempt  in its
entirety and may be subject to taxes in certain jurisdictions.

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on  distributions  by a
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
Different tax consequences may apply to a foreign  shareholder engaged in a U.S.
trade or business or present in the U.S. for 183 days or more in a year. Foreign
shareholders  should  consult their tax advisers  regarding the U.S. and foreign
tax consequences of investing in a Portfolio.

Conclusion

         The foregoing  discussion is based on Federal tax laws and  regulations
which  are in  effect on the date of this  Additional  Statement.  Such laws and
regulations may be changed by legislative or  administrative  action. No attempt
is made to present a detailed  explanation of the tax treatment of the Portfolio
or its  shareholders,  and the  discussion  here  and in the  Prospectus  is not
intended as a substitute for careful tax planning.  Shareholders  are advised to
consult their tax advisers with specific  reference to their own tax  situation,
including the application of state and local taxes.

         Although each Portfolio  expects to qualify as a RIC and to be relieved
of all or  substantially  all Federal  taxes,  depending  upon the extent of its
activities  in states and  localities  in which its offices are  maintained,  in
which its  agents  or  independent  contractors  are  located  or in which it is
otherwise deemed to be conducting business, each Portfolio may be subject to the
tax laws of such states or localities.

                                OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.

         Each  Portfolio is  responsible  for the payment of its expenses.  Such
expenses include, without limitation,  the fees and expenses payable to Northern
and  PFPC,  brokerage  fees  and  commissions,  fees  for  the  registration  or
qualification  of  Portfolio  shares  under  Federal or state  securities  laws,
expenses  of the  organization  of the  Portfolio,  taxes,  interest,  costs  of
liability insurance, fidelity bonds, indemnification or contribution, any costs,
expenses or losses arising out of any liability of or claim for damages or other
relief  asserted  against the Trust for  violation  of any law,  legal,  tax and
auditing  fees and expenses,  expenses of preparing  and printing  prospectuses,
statements of additional information,  proxy materials,  reports and notices and
the  printing  and  distributing  of the same to the  Trust's  shareholders  and
regulatory authorities,  compensation and expenses of its Trustees, expenses for
industry  organizations such as the Investment Company Institute,  miscellaneous
expenses and extraordinary expenses incurred by the Trust.

         The term "majority of the outstanding  shares" of either the Trust or a
particular  Portfolio  means,  with  respect to the  approval  of an  investment
advisory agreement or a change in a fundamental investment restriction, the vote
of the  lesser of (i) 67% or more of the  shares of the Trust or such  Portfolio
present at a meeting,  if the holders of more than 50% of the outstanding shares
of the Trust or such Portfolio are present or represented by proxy, or (ii) more
than 50% of the outstanding shares of the Trust or such Portfolio.

         Statements  contained in the Prospectus or in this Additional Statement
as to the  contents  of any  contract  or other  documents  referred  to are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the registration  statement of
which  the  Prospectus  and this  Additional  Statement  form a part,  each such
statement being qualified in all respects by such reference.

                              FINANCIAL STATEMENTS

         The audited financial statements and related report of _______________,
independent  auditors,  contained  in  the  annual  report  to  the  Portfolios'
shareholders  for the fiscal year ended November 30, 1999 (the "Annual  Report")
are hereby  incorporated herein by reference and attached hereto. No other parts
of the Annual Report, including without limitation,  "Management's Discussion of
Portfolio  Performance,"  are  incorporated by reference  herein.  Copies of the
Annual  Report  may be  obtained  upon  request  and  without  charge by calling
1-800-637-1380  (toll-free).  No  financial  statements  are  supplied  for  the
Municipal  Portfolio  because it did not commence  operations  during the period
ended November 30, 1999.

                                                        B-112



                                   APPENDIX A



Commercial Paper Ratings

         A Standard & Poor's Ratings Group, Inc. ("S&P") commercial paper rating
is a current  assessment of the  likelihood of timely  payment of debt having an
original maturity of no more than 365 days. The following  summarizes the rating
categories  used  by  Standard  and  Poor's  for  commercial  paper  that  is  a
permissible investment for the Portfolios:

         "A-1" - Obligations are rated in the highest  category  indicating that
the  obligor's  capacity to meet its financial  commitment on the  obligation is
strong.  Within this category,  certain  obligations  are designated with a plus
sign (+).  This  indicates  that the  obligor's  capacity to meet its  financial
commitment on these obligations is extremely strong.

         "A-2" -  Obligations  are  somewhat  more  susceptible  to the  adverse
effects of changes in circumstances and economic  conditions than obligations in
higher rating categories.  However, the obligor's capacity to meet its financial
commitment on the obligation is satisfactory.

         Moody's commercial paper ratings are opinions of the ability of issuers
to repay punctually  senior debt obligations not having an original  maturity in
excess of one year, unless explicitly noted. The following summarizes the rating
categories used by Moody's for commercial paper that is a permissible investment
for the Portfolios:

         "Prime-1"  -  Issuers  (or  supporting  institutions)  have a  superior
ability for repayment of senior short-term debt  obligations.  Prime-1 repayment
ability  will  often  be  evidenced  by many of the  following  characteristics:
leading market positions in well-established industries; high rates of return on
funds employed;  conservative capitalization structure with moderate reliance on
debt and ample asset  protection;  broad  margins in earnings  coverage of fixed
financial charges and high internal cash generation; and well-established access
to a range of financial markets and assured sources of alternate liquidity.

         "Prime-2" - Issuers (or supporting  institutions) have a strong ability
for  repayment of senior  short-term  debt  obligations.  This will  normally be
evidenced  by many of the  characteristics  cited above but to a lesser  degree.
Earnings  trends  and  coverage  ratios,  while  sound,  may be more  subject to
variation. Capitalization characteristics,  while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.

     The following summarizes the rating categories used by Duff & Phelps Credit
Rating Co. ("D&P") for commercial paper that is a permissible investment for the
Portfolios:

         "D-1+" - Debt  possesses  the  highest  certainty  of  timely  payment.
Short-term  liquidity,  including  internal  operating  factors and/or access to
alternative sources of funds, is outstanding, and safety is just below risk-free
U.S. Treasury short-term obligations.

     "D-1" - Debt  possesses very high  certainty of timely  payment.  Liquidity
factors are excellent and supported by good fundamental protection factors. Risk
factors are minor.

     "D-1-" - Debt possesses high certainty of timely payment. Liquidity factors
are strong and supported by good fundamental  protection  factors.  Risk factors
are very small.

         "D-2" - Debt  possesses  good  certainty of timely  payment.  Liquidity
factors and company  fundamentals are sound.  Although ongoing funding needs may
enlarge total  financing  requirements,  access to capital markets is good. Risk
factors are small.

     D&P  employs  three  designations,  "D-1+,"  "D-1" and  "D-1-,"  within the
highest rating category.


         Fitch IBCA ("Fitch")  short-term ratings apply to debt obligations that
have time horizons of less than 12 months for most  obligations,  or up to three
years for U.S. public finance  securities.  The following  summarizes the rating
categories  used by  Fitch  for  short-term  obligations  that  are  permissible
investments for the Portfolios:

         "F1" - Securities possess the highest credit quality.  This designation
indicates the strongest capacity for timely payment of financial commitments and
may have an added "+" to denote any exceptionally strong credit feature.

         "F2"  -  Securities  possess  good  credit  quality.  This  designation
indicates a satisfactory  capacity for timely payment of financial  commitments,
but the margin of safety is not as great as in the case of the higher ratings.

         Thomson   BankWatch,   Inc.  ("TBW")   short-term  ratings  assess  the
likelihood of an untimely  payment of principal and interest of debt instruments
with original  maturities  of one year or less.  The  following  summarizes  the
ratings used by TBW for short-term obligations that are permissible  investments
for the Portfolios:

         "TBW-1"  - This  designation  represents  TBW's  highest  category  and
indicates a very high  likelihood  that principal and interest will be paid on a
timely basis.

         "TBW-2" - This designation represents TBW's second-highest category and
indicates  that  while the  degree  of  safety  regarding  timely  repayment  of
principal and interest is strong,  the relative  degree of safety is not as high
as for issues rated "TBW-1."



<PAGE>


Corporate and Municipal Long-Term Debt Ratings


     The  following  summarizes  the  ratings  used by S&P's for  corporate  and
municipal debt that are permissible investments for the Portfolios:

     "AAA" - An  obligation  rated  "AAA" has the  highest  rating  assigned  by
Standard & Poor's.  The obligor's  capacity to meet its financial  commitment on
the obligation is extremely strong.

     "AA" - An obligation rated "AA" differs from the highest rated  obligations
only in small degree. The obligor's capacity to meet its financial commitment on
the obligation is very strong.

     PLUS (+) OR MINUS (-) - The "AA" rating  classification  may be modified by
the addition of a plus or minus sign to show relative  standing within the major
rating categories.

         "r" - This  symbol is  attached  to the  ratings  of  instruments  with
significant  noncredit  risks. It highlights risks to principal or volatility of
expected returns which are not addressed in the credit rating. Examples include:
obligations  linked  or  indexed  to  equities,   currencies,   or  commodities;
obligations  exposed  to  severe  prepayment  risk - such  as  interest-only  or
principal-only  mortgage  securities;   and  obligations  with  unusually  risky
interest terms, such as inverse floaters.

         The following summarizes the ratings used by Moody's Investors Service,
Inc. ("Moody's") for corporate and municipal long-term debt that are permissible
investments for the Portfolios:

         "Aaa" - Bonds are  judged  to be of the best  quality.  They  carry the
smallest  degree  of  investment  risk and are  generally  referred  to as "gilt
edged." Interest payments are protected by a large or by an exceptionally stable
margin and principal is secure. While the various protective elements are likely
to change,  such changes as can be  visualized  are most  unlikely to impair the
fundamentally strong position of such issues.

         "Aa" -  Bonds  are  judged  to be of  high  quality  by all  standards.
Together  with  the  "Aaa"  group  they  comprise  what are  generally  known as
high-grade  bonds.  They are rated lower than the best bonds because  margins of
protection  may  not be as  large  as in  "Aaa"  securities  or  fluctuation  of
protective  elements may be of greater  amplitude or there may be other elements
present  which make the  long-term  risk appear  somewhat  larger than the "Aaa"
securities.

         Con.  (---) - Bonds for which the security  depends upon the completion
of some act or the fulfillment of some condition are rated conditionally.  These
are bonds secured by (a) earnings of projects under  construction,  (b) earnings
of projects  unseasoned  in operating  experience,  (c) rentals which begin when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical  rating denotes probable credit stature upon completion
of construction or elimination of basis of condition.

         Note:  Moody's  applies  numerical  modifiers 1, 2, and 3 in the rating
classification  "Aa". The modifier 1 indicates that the obligation  ranks in the
higher end of its generic rating category;  the modifier 2 indicates a mid-range
ranking;  and the modifier 3 indicates a ranking in the lower end of its generic
rating category.


     The  following  summarizes  the  long-term  debt  ratings  used  by D&P for
corporate and municipal long-term debt that are permissible  investments for the
Portfolios:

     "AAA" - Debt is considered to be of the highest  credit  quality.  The risk
factors  are  negligible,  being  only  slightly  more than for  risk-free  U.S.
Treasury debt.

     "AA" - Debt is considered to be of high credit quality.  Protection factors
are strong.  Risk is modest but may vary  slightly  from time to time because of
economic conditions.

     To provide more detailed  indications of credit  quality,  the "AA" and "A"
ratings may be modified by the  addition of a plus (+) or minus (-) sign to show
relative standing within these major categories.

         The  following  summarizes  the ratings used by Fitch for corporate and
municipal bonds that are permissible investments for the Portfolio:

         "AAA" - Bonds  considered  to be  investment  grade and of the  highest
credit quality.  These ratings denote the lowest  expectation of credit risk and
are assigned only in case of exceptionally strong capacity for timely payment of
financial commitments. This capacity is highly unlikely to be adversely affected
by foreseeable events.

         "AA" - Bonds  considered to be investment grade and of very high credit
quality. These ratings denote a very low expectation of credit risk and indicate
very strong capacity for timely payment of financial commitments.  This capacity
is not significantly vulnerable to foreseeable events.

     To provide more detailed  indications of credit  quality,  the Fitch rating
"AA" may be  modified  by the  addition  of a plus (+) or minus (-) sign to show
relative standing within the major rating category.

         TBW assesses the  likelihood  of an untimely  repayment of principal or
interest over the term to maturity of long term debt and  preferred  stock which
are issued by United  States  commercial  banks,  thrifts  and  non-bank  banks;
non-United States banks; and broker-dealers. The following summarizes the rating
categories  used by TBW for long-term debt ratings for those  investments  which
are permissible investments for the Portfolios:

         "AAA" - This designation  indicates that the ability to repay principal
and interest on a timely basis is extremely high.

     "AA" - This designation  indicates a very strong ability to repay principal
and interest on a timely basis, with limited incremental risk compared to issues
rated in the highest category.

     PLUS (+) OR MINUS (-) - The  ratings  "AAA" and "AA" may  include a plus or
minus sign designation which indicates where within the respective  category the
issue is placed.

Municipal Note Ratings

         A S&P's rating reflects the liquidity  concerns and market access risks
unique to notes due in three years or less. The following summarizes the ratings
used by S&P's Ratings Group for municipal notes that are permissible investments
for the Portfolios:

         "SP-1" - The issuers of these municipal notes exhibit a strong capacity
to pay principal and  interest.  Those issues  determined to possess very strong
characteristics are given a plus (+) designation.

         "SP-2" - The  issuers of these  municipal  notes  exhibit  satisfactory
capacity to pay  principal  and  interest,  with some  vulnerability  to adverse
financial and economic changes over the term of the notes.

         Moody's  ratings  for state and  municipal  notes and other  short-term
loans are designated  Moody's  Investment Grade ("MIG") and variable rate demand
obligations are designated  Variable  Moody's  Investment  Grade ("VMIG").  Such
ratings recognize the differences  between  short-term credit risk and long-term
risk. The following  summarizes the ratings by Moody's for short-term notes that
are permissible investments for the Portfolios:

         "MIG-1"/"VMIG-1"  - This  designation  denotes best  quality.  There is
present strong protection by established cash flows,  superior liquidity support
or demonstrated broad-based access to the market for refinancing.

         "MIG-2"/"VMIG-2" - This designation denotes high quality,  with margins
of protection that are ample although not so large as in the preceding group.

     Fitch and D&P use the short-term  ratings  described under Commercial Paper
Ratings for municipal notes that are permissible investments for the Portfolios.



<PAGE>


                                     PART B

                       STATEMENT OF ADDITIONAL INFORMATION

                                 SERVICE SHARES
                                 PREMIER SHARES

                          NORTHERN INSTITUTIONAL FUNDS

                           GOVERNMENT SELECT PORTFOLIO
                              GOVERNMENT PORTFOLIO
                          DIVERSIFIED ASSETS PORTFOLIO
                              TAX-EXEMPT PORTFOLIO
                               MUNICIPAL PORTFOLIO


         This  Statement  of  Additional  Information  dated  April 1, 2000 (the
"Additional  Statement") is not a prospectus.  Copies of the prospectuses  dated
April 1, 2000 for the  Service  Shares  and  Premier  Shares  of the  Government
Select, Government, Diversified Assets, Municipal and Tax-Exempt Portfolios (the
"Portfolios")  of Northern  Institutional  Funds (each, a  "Prospectus")  may be
obtained without charge by calling  1-800-637-1380  (toll-free).  Each Portfolio
also offers one additional share class, Shares, which is described in a separate
statement of additional  information.  Capitalized  terms not otherwise  defined
have the same meaning as in the Prospectus.

         The audited financial  statements and related report of ______________,
independent  auditors,  contained  in  the  annual  report  to  the  Portfolios'
shareholders  for the fiscal year ended  November 30, 1999 (except for Municipal
Portfolio,  which did not commence operations during the period)are incorporated
herein by reference in the section  entitled  "Financial  Statements."  No other
parts of the annual report are incorporated  herein by reference.  Copies of the
annual  report  may be  obtained  upon  request  and  without  charge by calling
1-800-637-1380 (toll-free).


<PAGE>


                                      INDEX

<TABLE>
<CAPTION>
<S><C>                                                                                                         <C>
                                                                                                               Page
ADDITIONAL INVESTMENT INFORMATION...............................................................................B-3
         Classification and History.............................................................................B-3
         Investment Objectives, Strategies and Risks............................................................B-3
         Investment Restrictions...............................................................................B-12
ADDITIONAL TRUST INFORMATION...................................................................................B-15
         Trustees and Officers.................................................................................B-15
         Investment Adviser, Transfer Agent and Custodian......................................................B-20
         Portfolio Transactions................................................................................B-25
         Co-Administrators and Distributor.....................................................................B-26
         Counsel and Auditors..................................................................................B-28
         In-Kind Purchases and Redemptions.....................................................................B-28
         Third-Party Fees and Requirements.....................................................................B-29
PERFORMANCE INFORMATION........................................................................................B-29
AMORTIZED COST VALUATION.......................................................................................B-33
DESCRIPTION OF SERVICE SHARES AND PREMIER SHARES...............................................................B-34
ADDITIONAL INFORMATION CONCERNING TAXES........................................................................B-38
         General  B-38
         Special Tax Considerations Pertaining to the Tax-Exempt Portfolio.....................................B-39
         Foreign Investors.....................................................................................B-40
         Conclusion............................................................................................B-40
SERVICE PLAN      B-41
OTHER INFORMATION..............................................................................................B-42
FINANCIAL STATEMENTS...........................................................................................B-43
APPENDIX A......................................................................................................A-1
</TABLE>

                                ----------------

No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection with the offering of Service Shares and Premier Shares made by the
Prospectus and, if given or made, such information or  representations  must not
be relied upon as having been  authorized by the Trust or its  distributor.  The
Prospectus does not constitute an offering by the Trust or by the distributor in
any jurisdiction in which such offering may not lawfully be made.

An  investment in a Portfolio is not a deposit of any bank and is not insured or
guaranteed by the Federal Deposit Insurance  Corporation or any other government
agency.  Although  each of the  Portfolios  seeks to preserve  the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolios.


<PAGE>


                        ADDITIONAL INVESTMENT INFORMATION


Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment  company.  Each  Portfolio is  classified  as  diversified  under the
Investment Company Act of 1940, as amended (the "1940 Act").

         Each Portfolio is a series of the Trust, which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").  The  Trust,  is  the  result  of  a  reorganization  of  a
Massachusetts business trust known as The Benchmark Funds on March 31, 1998. The
Trust's name was changed from The Benchmark Funds to the Northern  Institutional
Funds on July 15, 1998.  The Trust also offers six fixed  income,  one balanced,
and nine equity  portfolios,  which are not  described  in this  document.
Investment Objectives, Strategies and Risks

         The following  supplements  the investment  objectives,  strategies and
risks of the Portfolios as set forth in the Prospectus. The investment objective
of each Portfolio  (except  Municipal  Portfolio) may not be changed without the
vote of the majority of the Portfolio's  outstanding shares. Except as expressly
noted  below,  however,  each  Portfolio's  investment  policies  may be changed
without  shareholder  approval.

     Commercial Paper,  Bankers'  Acceptances,  Certificates of Deposit and Time
Deposits

         Commercial  paper  represents  short-term  unsecured  promissory  notes
issued in  bearer  form by banks or bank  holding  companies,  corporations  and
finance companies.  Certificates of deposit are negotiable  certificates  issued
against funds  deposited in a commercial  bank for a definite period of time and
earning a specified return.  Bankers' acceptances are negotiable drafts or bills
of  exchange,  normally  drawn by an importer  or  exporter to pay for  specific
merchandise,  which are "accepted" by a bank,  meaning, in effect, that the bank
unconditionally  agrees to pay the face  value of the  instrument  on  maturity.
Fixed time deposits are bank  obligations  payable at a stated maturity date and
bearing interest at a fixed rate. Fixed time deposits may be withdrawn on demand
by the  investor,  but may be subject to early  withdrawal  penalties  that vary
depending upon market  conditions and the remaining  maturity of the obligation.
There are no  contractual  restrictions  on the right to  transfer a  beneficial
interest in a fixed time deposit to a third party.

     As  stated  in  the  Prospectus,   the  Diversified  Assets  and  Municipal
Portfolios may each invest a portion of its assets in the obligations of foreign
banks  and  foreign  branches  of  domestic  banks.  Such  obligations   include
Eurodollar Certificates of Deposit ("ECDs"),  which are U.S.  dollar-denominated
certificates  of deposit issued by offices of foreign and domestic banks located
outside the United States;  Eurodollar  Time Deposits  ("ETDs"),  which are U.S.
dollar-denominated  deposits  in a foreign  branch  of a U.S.  bank or a foreign
bank;  Canadian Time Deposits  ("CTDs"),  which are essentially the same as ETDs
except they are issued by Canadian offices of major Canadian banks; Schedule Bs,
which are obligations  issued by Canadian branches of foreign or domestic banks;
Yankee Certificates of Deposit ("Yankee CDs"), which are U.S. dollar-denominated
certificates  of deposit  issued by a U.S.  branch of a foreign bank and held in
the United States;  and Yankee Bankers'  Acceptances  ("Yankee Bas"),  which are
U.S.  dollar-denominated  bankers'  acceptances  issued  by a U.S.  branch  of a
foreign bank and held in the United States.

     The Diversified Assets Portfolio may also invest in high quality commercial
paper  and  other   obligations   issued  or  guaranteed  by  U.S.  and  foreign
corporations  and other issuers rated (at the time of purchase) A-2 or higher by
Standard & Poor's  Ratings  Group,  Inc.  ("S&P"),  Prime-2 or higher by Moody's
Investors Service,  Inc.  ("Moody's"),  Duff 2 or higher by Duff & Phelps Credit
Rating Co.  ("D&P"),  F-2 or higher by Fitch IBCA,  Inc.  ("Fitch")  or TBW-2 or
higher by Thomson BankWatch,  Inc. ("TBW"). The Diversified Assets Portfolio may
also  invest  in rated  and  unrated  corporate  bonds,  notes,  paper and other
instruments that are of comparable  quality to the commercial paper permitted to
be purchased by the Portfolio.

Zero Coupon Bonds

         To  the  extent  consistent  with  Municipal   Portfolio's   investment
objective,  the Portfolio may invest in zero coupon bonds. Zero coupon bonds are
debt securities  issued or sold at a discount from their face value and which do
not entitle the holder to any periodic  payment of interest prior to maturity or
a specified  date.  The original  issue  discount  varies  depending on the time
remaining until maturity or cash payment date,  prevailing  interest rates,  the
liquidity of the  security and  perceived  credit  quality of the issuer.  These
securities  also may take the form of debt securities that have been stripped of
their  unmatured  interest  coupons,  the  coupons  themselves  or  receipts  or
certificates  representing  interests  in  such  stripped  debt  obligations  or
coupons. The market prices of zero coupon bonds generally are more volatile than
the market prices of interest bearing  securities and are likely to respond to a
greater  degree of changes in interest  rates than interest  bearing  securities
having similar maturities and credit quality.

         Zero coupon bonds involve the additional risk that,  unlike  securities
that periodically pay interest to maturity, the Municipal Portfolio will realize
no  cash  until a  specified  future  payment  date  unless  a  portion  of such
securities is sold and, if the issuer of such securities defaults, the Portfolio
may obtain no return at all on its  investment.  In  addition,  even though such
securities  do not  provide for the  payment of current  interest  in cash,  the
Municipal Portfolio is nonetheless  required to accrue income on such investment
for each  taxable  year and  generally  is required to  distribute  such accrued
amounts  (net of  deductible  expenses,  if any) to avoid being  subject to tax.
Because no cash is generally received at the time of the accrual,  the Municipal
Portfolio  may be required to liquidate  other  portfolio  securities  to obtain
sufficient cash to satisfy Federal tax distribution  requirements  applicable to
the Portfolio.

Asset-Backed Securities

         To the extent  described in the  Prospectus,  the  Diversified  Assets,
Tax-Exempt and Municipal Portfolios may purchase asset-backed securities,  which
are  securities  backed  by  mortgages,   installment  contracts,   credit  card
receivables  or other assets.  Asset-backed  securities  represent  interests in
"pools"  of assets in which  payments  of both  interest  and  principal  on the
securities are made periodically, thus in effect "passing through" such payments
made by the individual borrowers on the assets that underlie the securities, net
of any fees paid to the issuer or guarantor of the securities.  The average life
of  asset-backed  securities  varies  with  the  maturities  of  the  underlying
instruments,   and  the  average  life  of  a  mortgage-backed   instrument,  in
particular, is likely to be substantially less than the original maturity of the
mortgage pools  underlying  the securities as a result of mortgage  prepayments.
For this and other reasons,  an asset-backed  security's  stated maturity may be
shortened,  and  the  security's  total  return  may  be  difficult  to  predict
precisely.

         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower than expected prepayments will decrease, yield to maturity.

         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.  Such difficulties are not, however, expected to have a significant
effect on the Diversified Assets,  Tax-Exempt and Municipal Portfolios since the
remaining maturity of any asset-backed  security  acquired,  as calculated under
applicable SEC regulations, will be 397 days or less.

         Asset-backed securities acquired by the Diversified Assets,  Tax-Exempt
and  Municipal  Portfolios  may  include  collateralized   mortgage  obligations
("CMOs") issued by private  companies.  CMOs provide the holder with a specified
interest  in  the  cash  flow  of  a  pool  of  underlying  mortgages  or  other
mortgage-backed  securities.  Issuers  of CMOs  ordinarily  elect to be taxed as
pass-through   entities  known  as  real  estate  mortgage  investment  conduits
("REMICs").  CMOs are issued in multiple classes, each with a specified fixed or
floating  interest  rate and a final  distribution  date.  The relative  payment
rights of the various CMO classes may be  structured  in a variety of ways.  The
Portfolio will not purchase  "residual" CMO  interests,  which normally  exhibit
greater price volatility.

     There  are a  number  of  important  differences  among  the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by the GNMA  include  GNMA  Mortgage  Pass-Through  Certificates  (also known as
"Ginnie  Maes"),  which are guaranteed as to the timely payment of principal and
interest  by GNMA and backed by the full faith and credit of the United  States.
GNMA is a  wholly-owned  U.S.  Government  corporation  within the Department of
Housing and Urban  Development.  GNMA  certificates  also are  supported  by the
authority of GNMA to borrow funds from the U.S.  Treasury to make payments under
its guarantee. Mortgage-backed securities issued by FNMA include FNMA Guaranteed
Mortgage  Pass-Through  Certificates  (also known as "Fannie  Maes"),  which are
solely the  obligations  of FNMA and are not backed by or entitled to full faith
and credit of the United States, but are supported by the right of the issuer to
borrow from the  Treasury.  FNMA is a  government-sponsored  organization  owned
entirely  by  private  stockholders.  Fannie  Maes are  guaranteed  as to timely
payment of the  principal  and  interest  by FNMA.  Mortgage-related  securities
issued by the FHLMC  include FHLMC  Mortgage  Participation  Certificates  (also
known as "Freddie Macs" or "PCs").  FHLMC is a corporate  instrumentality of the
United States,  created pursuant to an Act of Congress,  which is owned entirely
by  Federal  Home  Loan  Banks.  Freddie  Macs  are  not  guaranteed  and do not
constitute a debt or obligation of the United States or of any Federal Home Loan
Bank.  Freddie Macs entitle the holder to timely  payment of interest,  which is
guaranteed  by FHLMC.  FHLMC  guarantees  either  ultimate  collection or timely
payment of all principal  payments on the underlying  mortgage loans. When FHLMC
does not guarantee  timely payment of principal,  FHLMC may remit the amount due
on account of its  guarantee of ultimate  payment of principal at any time after
default on an underlying mortgage,  but in no event later than one year after it
becomes payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and Federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support  payments on these  securities.

     Supranational  Bank  Obligations  The  Diversified  Assets,  Municipal  and
Tax-Exempt   Portfolios  may  invest  in  obligations  of  supranational  banks.
Supranational banks are international banking institutions designed or supported
by national governments to promote economic reconstruction, development or trade
among nations (e.g., the International Bank for Reconstruction and Development).
Obligations of  supranational  banks may be supported by appropriated but unpaid
commitments  of their  member  countries  and there is no  assurance  that these
commitments will be undertaken or met in the future.

U.S. Government Obligations

         Examples  of the  types  of U.S.  Government  obligations  that  may be
acquired by the  Portfolios  include U.S.  Treasury  Bills,  Treasury  Notes and
Treasury  Bonds and the  obligations  of Federal  Home Loan Banks,  Federal Farm
Credit Banks,  Federal Land Banks, the Federal Housing  Administration,  Farmers
Home  Administration,  Export-Import  Bank of the United States,  Small Business
Administration,  Federal  National  Mortgage  Association  ("FNMA"),  Government
National Mortgage Association ("GNMA"), General Services Administration, Central
Bank for Cooperatives, Federal Home Loan Mortgage Corporation ("FHLMC"), Federal
Intermediate Credit Banks, and the Maritime Administration.

         Securities  guaranteed  as  to  principal  and  interest  by  the  U.S.
Government,  its  agencies or  instrumentalities  are also deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of credit  issued by the U.S.  Government  or any  agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

         To the extent consistent with its investment objectives, the Portfolios
may invest in a variety of US. Treasury obligations and obligations issued by or
guaranteed by the U.S. Government or its agencies and instrumentalities. Not all
U.S.  Government  obligations carry the same credit support. No assurance can be
given that the U.S.  Government would provide  financial support to its agencies
or  instrumentalities  if it is  not  obligated  to do so by  law.  There  is no
assurance  that these  commitments  will be  undertaken  or complied with in the
future.  In addition,  the secondary market for certain  participations in loans
made to foreign governments or their agencies may be limited.

Custodial Receipts for Treasury Securities

         The Portfolios (other than the Government Select Portfolio) may acquire
U.S. Government  obligations and their unmatured interest coupons that have been
separated ("stripped") by their holder, typically a custodian bank or investment
brokerage  firm.  Having  separated  the interest  coupons  from the  underlying
principal  of the U.S.  Government  obligations,  the  holder  will  resell  the
stripped  securities  in custodial  receipt  programs with a number of different
names, including "Treasury Income Growth Receipts" ("TIGRs") and "Certificate of
Accrual  on  Treasury  Securities"  ("CATS").  The  stripped  coupons  are  sold
separately  from  the  underlying  principal,  which is  usually  sold at a deep
discount  because the buyer  receives  only the right to receive a future  fixed
payment on the  security  and does not receive  any rights to periodic  interest
(cash)  payments.  The underlying U.S.  Treasury bonds and notes  themselves are
held in  book-entry  form at the Federal  Reserve Bank or, in the case of bearer
securities  (i.e.,  unregistered  securities  which are ostensibly  owned by the
bearer or holder), in trust on behalf of the owners. Counsel to the underwriters
of  these  certificates  or  other  evidences  of  ownership  of  U.S.  Treasury
securities  have stated  that,  in their  opinion,  purchasers  of the  stripped
securities  most likely will be deemed the beneficial  holders of the underlying
U.S.  Government  obligations for Federal tax purposes.  The Trust is unaware of
any binding legislative, judicial or administrative authority on this issue.

U.S. Treasury STRIPS

         The Treasury Department has facilitated  transfers of ownership of zero
coupon  securities  by accounting  separately  for the  beneficial  ownership of
particular interest coupon and principal payments on Treasury securities through
the Federal  Reserve  book-entry  record-keeping  system.  The  Federal  Reserve
program as  established  by the  Treasury  Department  is known as  "STRIPS"  or
"Separate Trading of Registered Interest and Principal of Securities." Under the
STRIPS  program,  a Portfolio will be able to have its  beneficial  ownership of
zero coupon securities recorded directly in the book-entry record-keeping system
in lieu of having to hold  certificates  or other  evidences of ownership of the
underlying U.S. Treasury  securities.  All Portfolios,  including the Government
Select Portfolio, may acquire securities registered under the STRIPS program.

Bank and Deposit Notes

         The Diversified  Assets and Municipal  Portfolios may purchase bank and
deposit notes.  Bank notes rank junior to deposit  liabilities of banks and pari
passu with  other  senior,  unsecured  obligations  of the bank.  Bank notes are
classified as "other  borrowings" on a bank's balance sheet, while deposit notes
and  certificates  of deposit are  classified  as  deposits.  Bank notes are not
insured by the  Federal  Deposit  Insurance  Corporation  or any other  insurer.
Deposit notes are insured by the Federal Deposit  Insurance  Corporation only to
the extent of $100,000 per depositor  per bank.

Variable and Floating Rate Instruments

         With respect to the variable and floating rate  instruments that may be
acquired by the  Portfolios  as  described  in the  Prospectus,  Northern  Trust
Company  (the  "Investment  Adviser" or  "Northern")  will  consider the earning
power,  cash flows and other  liquidity  ratios of the issuers and guarantors of
such instruments  and, if the instruments are subject to demand  features,  will
monitor  their  financial  status and ability to meet  payment on demand.  Where
necessary  to ensure  that a variable or floating  rate  instrument  is of "high
quality," the issuer's obligation to pay the principal of the instrument will be
backed  by an  unconditional  bank  letter  or  line  of  credit,  guarantee  or
commitment  to lend.  The  Portfolios  will invest in variable and floating rate
instruments  only when Northern deems the  investment to involve  minimal credit
risk.  Unrated  variable and floating  rate  instruments  will be  determined by
Northern  to be of  comparable  quality  at the  time of the  purchase  to rated
instruments  that may be purchased by the  Portfolios.  In determining  weighted
average  portfolio  maturity,  an instrument may,  subject to the Securities and
Exchange  Commission's  (the  "SEC")  regulations,  be deemed to have a maturity
shorter than its nominal  maturity based on the period  remaining until the next
interest rate adjustment or the time the Portfolio  involved can recover payment
of  principal  as  specified  in the  instrument.  Variable  and  floating  rate
instruments  eligible  for purchase by the  Portfolio  include  variable  amount
master demand notes, which permit the indebtness  thereunder to vary in addition
to providing for periodic adjustments in the interest rate.

         Variable  and floating  rate  instruments  held by a Portfolio  will be
subject to the Portfolio's limitation on illiquid investments when the Portfolio
may not demand  payment  of the  principal  amount  within  seven days  absent a
reliable trading market.

Investment Companies

         With respect to the  investments of the Portfolios in the securities of
other  investment  companies,  such  investments  will be  limited  so that,  as
determined  after a purchase  is made,  either (a) not more than 3% of the total
outstanding stock of such investment  company will be owned by a Portfolio,  the
Trust as a whole and their  affiliated  persons (as defined in the 1940 Act), or
(b)(i) not more than 5% of the value of the total assets of a Portfolio  will be
invested in the securities of any one investment company; (ii) not more than 10%
of the value of its total assets will be invested in the aggregate in securities
of  investment  companies  as a  group;  and  (iii)  not  more  than  3% of  the
outstanding  voting  stock of any one  investment  company  will be owned by the
Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolios may not be obligated to redeem such securities in an amount exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.

     If required by the 1940 Act, each  Portfolio  expects to vote the shares of
other  investment  companies  that are held by it in the same  proportion as the
vote of all other holders of such securities.

         A  Portfolio  may  invest all or  substantially  all of its assets in a
single open-end investment company or series thereof with substantially the same
investment objective,  policies and restrictions as the Portfolio. However, each
Portfolio  currently  intends to limit its  investments in securities  issued by
other investment companies to the extent described above. A Portfolio may adhere
to more  restrictive  limitations  with respect to its investments in securities
issued by other  investment  companies if required by the SEC or deemed to be in
the best interests of the Trust.

Repurchase Agreements

         Each  Portfolio  may  agree  to  purchase  portfolio   securities  from
financial institutions subject to the seller's agreement to repurchase them at a
mutually  agreed  upon  date and  price  ("repurchase  agreements").  Repurchase
agreements  are  considered  loans  under the 1940 Act.  Securities  subject  to
repurchase agreements are held either by the Trust's custodian (or subcustodian,
if any), or in the Federal Reserve/Treasury  Book-Entry System. The seller under
a repurchase  agreement will be required to maintain the value of the securities
subject to the agreement in an amount  exceeding the repurchase price (including
accrued interest). Default by the seller would, however, expose the Portfolio to
possible loss because of adverse  market action or delay in connection  with the
disposition of the underlying obligations.

Reverse Repurchase Agreements

         Each Portfolio  (except the  Tax-Exempt  Portfolio) may borrow funds by
selling  portfolio  securities  to  financial  institutions  such as  banks  and
broker/dealers  and agreeing to repurchase them at a mutually specified date and
price ("reverse repurchase agreements").  The Portfolios may use the proceeds of
reverse repurchase  agreements to purchase other securities either maturing,  or
under  an  agreement  to  resell,  at a date  simultaneous  with or prior to the
expiration of the reverse repurchase  agreement.  Reverse repurchase  agreements
involve the risk that the market value of the securities sold by a Portfolio may
decline below the repurchase  price. The Portfolios will pay interest on amounts
obtained pursuant to a reverse  repurchase  agreement.  While reverse repurchase
agreements  are  outstanding,  a Portfolio  will  segregate  liquid assets in an
amount  at least  equal to the  market  value of the  securities,  plus  accrued
interest, subject to the agreement. Reverse repurchase agreements are considered
to be borrowings under the 1940 Act.

Securities Lending

         Collateral  for loans of portfolio  securities  made by a Portfolio may
consist of cash, cash  equivalents,  securities issued or guaranteed by the U.S.
Government  or its  agencies  or  irrevocable  bank  letters  of credit  (or any
combination  thereof).  The borrower of securities  will be required to maintain
the market  value of the  collateral  at not less than the  market  value of the
loaned  securities,  and such value will be monitored  on a daily basis.  When a
Portfolio lends its securities,  it continues to receive  dividends and interest
on the securities loaned and may simultaneously  earn interest on the investment
of the cash collateral.  Although voting rights, or rights to consent, attendant
to securities  on loan pass to the  borrower,  such loans will be called so that
the  securities  may be voted by a Portfolio if a material  event  affecting the
investment is to occur.

Forward Commitments and When-Issued Securities

         Each  Portfolio  may  purchase  securities  on a  when-issued  basis or
purchase or sell securities on a forward  commitment  (sometimes  called delayed
delivery)  basis.  These  transactions  involve a commitment by the Portfolio to
purchase  or sell  securities  at a future  date.  The  price of the  underlying
securities  (usually  expressed  in  terms  of  yield)  and the  date  when  the
securities will be delivered and paid for (the settlement date) are fixed at the
time the transaction is negotiated. When-issued purchases and forward commitment
transactions are normally negotiated directly with the other party.

         A Portfolio will purchase securities on a when-issued basis or purchase
or sell  securities  on a forward  commitment  basis only with the  intention of
completing the transaction and actually purchasing or selling the securities. If
deemed advisable as a matter of investment  strategy,  however,  a Portfolio may
dispose of or negotiate a commitment  after  entering into it. A Portfolio  also
may sell  securities it has committed to purchase  before those  securities  are
delivered to the Portfolio on the  settlement  date. The Portfolio may realize a
capital gain or loss in connection with these transactions.

         When a  Portfolio  purchases  securities  on a  when-issued  or forward
commitment  basis,  the Portfolio  will  segregate  liquid assets having a value
(determined  daily) at least  equal to the  amount of the  Portfolio's  purchase
commitments  until three days prior to the settlement  date, or otherwise  cover
its position.  These  procedures  are designed to ensure that the Portfolio will
maintain  sufficient  assets  at  all  times  to  cover  its  obligations  under
when-issued  purchases,  forward commitments and delayed-delivery  transactions.
For purposes of determining a Portfolio's average dollar-weighted  maturity, the
maturity of when-issued or forward commitment securities will be calculated from
the commitment date.

Insurance Funding Agreements

         The  Diversified  Assets  Portfolio  may  invest in  insurance  funding
agreements  ("IFAs").  An IFA is  normally a general  obligation  of the issuing
insurance company and not a separate account. The purchase price paid for an IFA
becomes part of the general assets of the insurance company, and the contract is
paid from the company's  general assets.  Generally,  IFAs are not assignable or
transferable without the permission of the issuing insurance  companies,  and an
active secondary market in IFAs may not exist.

Yields and Ratings

         The  yields  on  certain   obligations,   including  the  money  market
instruments  in which the Portfolios  invest (such as commercial  paper and bank
obligations),  are dependent on a variety of factors, including general economic
conditions,  conditions in the particular  market for the obligation,  financial
condition of the issuer,  size of the offering,  maturity of the  obligation and
ratings of the issue. The ratings of S&P, Moody's,  D&P, Fitch and TBW represent
their respective opinions as to the quality of the obligations they undertake to
rate. Ratings,  however,  are general and are not absolute standards of quality.
Consequently,  obligations with the same rating,  maturity and interest rate may
have different  market prices.  For a more complete  discussion of ratings,  see
Appendix A to this document.

         Subject to the limitations stated in the Prospectus, if a security held
by the Portfolio  undergoes a rating  revision,  the  Portfolios may continue to
hold the  security  if the  Investment  Adviser  determines  such  retention  is
warranted.

Municipal Instruments

         Municipal  instruments are high quality,  short-term  instruments,  the
interest on which is, in the opinion of bond counsel to the issuers, exempt from
Federal income tax. Opinions  relating to the validity of municipal  instruments
and to Federal and state tax issues relating to these securities are rendered by
bond counsel to the respective issuing authorities at the time of issuance. Such
opinions may contain various assumptions,  qualifications or exceptions that are
reasonably  acceptable  to the  Investment  Adviser.  Neither  the Trust nor the
Investment  Adviser  will review the  proceedings  relating  to the  issuance of
municipal instruments or the bases for such opinions.

     Municipal  instruments  include both  "general" and "revenue"  obligations.
General obligations are secured by the issuer's pledge of its full faith, credit
and taxing power for the payment of principal and interest.  Revenue obligations
are payable only from the revenues  derived from a particular  facility or class
of facilities  or, in some cases,  from the proceeds of a special  excise tax or
other specific  revenue  source such as lease revenue  payments from the user of
the facility  being  financed.  Industrial  development  bonds are in most cases
revenue  securities  and are not payable from the  unrestricted  revenues of the
issuer.  Consequently,  the credit  quality  of an  industrial  revenue  bond is
usually  directly  related to the credit  standing  of the  private  user of the
facility involved.

         Industrial  development bonds are in most cases revenue  securities and
are not payable from the unrestricted revenues of the issuer. Consequently,  the
credit quality of an industrial  revenue bond is usually directly related to the
credit standing of the private user of the facility involved.

     Within the principal  classifications  of municipal  instruments  described
above there are a variety of categories,  including  municipal bonds,  municipal
notes,  municipal leases,  custodial  receipts and  participation  certificates.
Municipal  notes  include  tax,  revenue  and bond  anticipation  notes of short
maturity,  generally less than three years, which are issued to obtain temporary
funds  for  various  public  purposes.   Municipal   leases  and   participation
certificates  are  obligations   issued  by  state  and  local   governments  or
authorities   to  finance  the   acquisition   of  equipment   and   facilities.
Participation   certificates   may  represent   participation  in  a  lease,  an
installment  purchase  contract,  or  a  conditional  sales  contract.   Certain
municipal lease obligations (and related participation certificates) may include
"non-appropriation"   clauses  which  provide  that  the   municipality  has  no
obligation to make lease or installment purchase payments in future years unless
money is appropriated for such purpose on a yearly basis. Custodial receipts are
underwritten  by  securities  dealers or banks and evidence  ownership of future
interest payments,  principal payments or both on certain municipal  securities.
Municipal  leases (and  participations  in such leases)  present the risk that a
municipality will not appropriate  funds for the lease payments.  The Investment
Adviser, under the supervision of the Trust's Board of Trustees,  will determine
the  credit  quality  of any  unrated  municipal  leases  on an  ongoing  basis,
including an assessment of the likelihood that the leases will not be cancelled.

         The  Tax-Exempt  and  Municipal  Portfolios  may also  invest in "moral
obligation"   bonds,  which  are  normally  issued  by  special  purpose  public
authorities. If the issuer of a moral obligation bond is unable to meet its debt
service  obligations  from current  revenues,  it may draw on a reserve fund (if
such a  fund  has  been  established),  the  restoration  of  which  is a  moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

         Municipal  bonds  with a series of  maturity  dates are  called  Serial
Bonds. The Tax-Exempt  Portfolio and the Municipal Portfolio may purchase Serial
Bonds and  other  long-term  securities  provided  that  they  have a  remaining
maturity meeting the Portfolios' maturity requirements.  The Portfolios may also
purchase  long-term  variable and floating rate bonds (sometimes  referred to as
"Put Bonds")  where the  Portfolios  obtain at the time of purchase the right to
put the bond back to the issuer or a third party at par at least every  thirteen
months. Put Bonds with conditional puts (that is, puts which cannot be exercised
if the issuer defaults on its payment  obligations)  will present risks that are
different than those of other municipal  instruments  because of the possibility
that the  Portfolios  might hold  long-term  Put Bonds on which  defaults  occur
following acquisition by the Portfolios.

         Municipal   instruments  purchased  by  the  Tax-Exempt  Portfolio  and
Municipal  Portfolio may be backed by letters of credit or other forms of credit
enhancement  issued by foreign (as well as domestic)  banks and other  financial
institutions.  The credit  quality  of these  banks and  financial  institutions
could,  therefore,   cause  loss  to  a  Portfolio  that  invests  in  municipal
instruments.  Letters  of credit  and other  obligations  of  foreign  financial
institutions  may  involve  certain  risks in  addition  to  those  of  domestic
obligations.

         The  Tax-Exempt  Portfolio  may invest in fixed and variable rate notes
and  similar  debt  instruments  rated  MIG-2,  VMIG-2 or  Prime-2  or higher by
Moody's,  SP-2 or A-2 or higher by S&P,  AA or higher by D&P or F-2 or higher by
Fitch and tax-exempt commercial paper and similar debt instruments rated Prime-2
or higher by  Moody's,  A-2 or higher by S&P,  Duff 2 or higher by D&P or F-2 or
higher by Fitch.  The Tax-Exempt  Portfolio may also invest in rated and unrated
municipal  bonds,  notes,  paper or  other  instruments  that are of  comparable
quality to the  tax-exempt  commercial  paper  permitted  to be purchased by the
Portfolio.

         The  Tax-Exempt  Portfolio  may  acquire  securities  in  the  form  of
custodial  receipts  evidencing  rights to  receive a specific  future  interest
payment,  principal  payment  or both on  certain  municipal  obligations.  Such
obligations  are held in  custody  by a bank on  behalf  of the  holders  of the
receipts.  These  custodial  receipts  are  known by  various  names,  including
"Municipal   Receipts,"   "Municipal   Certificates  of  Accrual  on  Tax-Exempt
Securities"  ("M-CATS") and "Municipal  Zero-Coupon Receipts." The Portfolio may
also purchase  certificates of participation  that, in the opinion of counsel to
the  issuer,  are exempt  from  regular  Federal  income  tax.  Certificates  of
participation are a type of floating or variable rate obligation that represents
interests in a pool of municipal obligations held by a bank.

         An issuer's obligations under its municipal  instruments are subject to
the provisions of bankruptcy, insolvency and other laws affecting the rights and
remedies of creditors,  such as the Federal  Bankruptcy  Code, and laws, if any,
which may be enacted by Federal  or state  legislatures  extending  the time for
payment of principal or interest,  or both, or imposing other  constraints  upon
enforcement of such  obligations or upon the ability of  municipalities  to levy
taxes. The power or ability of an issuer to meet its obligations for the payment
of interest on and  principal of its  municipal  instruments  may be  materially
adversely affected by litigation or other conditions.

         From time to time proposals have been  introduced  before  Congress for
the purpose of restricting  or eliminating  the Federal income tax exemption for
interest on municipal instruments. For example, under the Tax Reform Act of 1986
interest on certain  private  activity  bonds must be included in an  investor's
Federal alternative minimum taxable income, and corporate investors must include
all tax-exempt interest in their Federal alternative minimum taxable income. The
Trust cannot predict what legislation,  if any, may be proposed in the future in
Congress  as regards the  Federal  income tax status of  interest  on  municipal
instruments or which  proposals,  if any, might be enacted.  Such proposals,  if
enacted,  might  materially and adversely  affect the  availability of municipal
instruments for investment by the Tax-Exempt and Municipal  Portfolios and their
liquidity and value. In such an event the Board of Trustees would reevaluate the
Portfolio's  investment  objective  and  policies  and  consider  changes in its
structure or possible dissolution.

         As a matter  of  fundamental  policy,  at least  80% of the  Tax-Exempt
Portfolio  and  Municipal   Portfolio  net  assets  will  be  invested  in  debt
instruments, the interest on which is, in the opinion of bond counsel or counsel
for  issuers,  if any,  exempt  from  regular  Federal  income  tax,  except  in
extraordinary  circumstances  such as when the Investment  Adviser believes that
market  conditions  indicate  that  the  Portfolios  should  adopt  a  temporary
defensive   posture  by  holding   uninvested  cash  or  investment  in  taxable
securities,  except under extraordinary circumstances.  Taxable investments will
consist  exclusively  of  instruments  that may be purchased by the  Diversified
Assets Portfolio.

     The  risks   associated  with  these   investments  are  described  in  the
Prospectus.


         Interest earned by the Tax-Exempt  Portfolio on private  activity bonds
(if any) that is treated as a specific  tax  preference  item under the  Federal
alternative  minimum tax will not be deemed to have been derived from  municipal
instruments  for  purposes  of  determining  whether  that  Portfolio  meets its
fundamental policy that at least 80% of its net assets be derived from municipal
instruments.

         Certain of the  municipal  instruments  held by the  Municipal  and the
Tax-Exempt  Portfolios  may be insured as to the timely payment of principal and
interest.  The insurance  policies will usually be obtained by the issuer of the
Municipal Instrument at the time of its original issuance. In the event that the
issuer  defaults on an  interest  or  principal  payment,  the  insurer  will be
notified  and will be required to make  payment to the bond  holders.  There is,
however,  no guarantee that the insurer will meet its obligations.  In addition,
such insurance will not protect against market fluctuations caused by changes in
interest rates and other factors. The Portfolios may invest more than 25% of its
total assets in municipal instruments covered by insurance policies.

         As described in the Prospectus, the Municipal and Tax-Exempt Portfolios
may invest in municipal leases,  which may be considered liquid under guidelines
established by the Trust's Board of Trustees.  The  guidelines  will provide for
determination  of the liquidity of a municipal lease obligation based on factors
including  the  following:  (1) the  frequency  of  trades  and  quotes  for the
obligation;  (2) the number of dealers  willing to purchase or sell the security
and the number of other  potential  buyers;  (3) the  willingness  of dealers to
undertake  to  make  a  market  in the  security;  and  (4)  the  nature  of the
marketplace  trades,  including the time needed to dispose of the security,  the
method of  soliciting  offers and the  mechanics  of  transfer.  The  Investment
Adviser,  under the  supervision  of the Trust's  Board of  Trustees,  will also
consider  marketability of a municipal lease  obligations based upon an analysis
of the general credit quality of the municipality issuing the obligation and the
essentiality to the municipality of the property covered by the lease.

     Currently,  it is not the  intention of the  Portfolios to invest more than
25% of the value of their total assets in Municipal  Instruments  whose  issuers
are in the same state.

Standby Commitments

         The  Tax-Exempt  and  Municipal   Portfolios  may  enter  into  standby
commitments with respect to municipal  instruments  held by them,  respectively.
Under a standby  commitment,  a dealer  agrees to  purchase  at the  Portfolio's
option a specified Municipal Instrument.  Standby commitments may be exercisable
by the  Tax-Exempt  and Municipal  Portfolios at any time before the maturity of
the underlying  municipal  instruments and may be sold,  transferred or assigned
only with the instruments involved.

         The Tax-Exempt and Municipal Portfolios expect that standby commitments
will  generally  be  available  without  the  payment of any direct or  indirect
consideration.  However, if necessary or advisable, the Tax-Exempt and Municipal
Portfolios  may pay for a standby  commitment  either  separately  in cash or by
paying a higher price for Municipal  Instruments  which are acquired  subject to
the commitment (thus reducing the yield to maturity otherwise  available for the
same securities). The total amount paid in either manner for outstanding standby
commitments  held  either  Portfolio  will not exceed 1/2 of 1% of the value the
Portfolio's total assets calculated immediately after each standby commitment is
acquired.

         The  Tax-Exempt and Municipal  Portfolios  intend to enter into standby
commitments only with dealers, banks and broker-dealers which, in the Investment
Adviser's  opinion,  present minimal credit risks.  The Tax-Exempt and Municipal
Portfolios  will acquire  standby  commitments  solely to  facilitate  portfolio
liquidity  and do not intend to exercise  their  rights  thereunder  for trading
purposes.  The acquisition of a standby commitment will not affect the valuation
of the underlying  Municipal  Instrument.  The actual standby commitment will be
valued at zero in determining net asset value. Accordingly, where the Tax-Exempt
and Municipal  Portfolios pay directly or indirectly  for a standby  commitment,
the  Portfolios'  costs will be reflected as an  unrealized  loss for the period
during which the commitment is held by the  Tax-Exempt and Municipal  Portfolios
and will be reflected in realized gain or loss when the  commitment is exercised
or expires.

Illiquid or Restricted Securities

         Each  Portfolio  may invest up to 10% of its net  assets in  securities
that are illiquid.  The Portfolios may purchase commercial paper issued pursuant
to Section 4(2) of the 1933 Act and securities that are not registered under the
1933 Act but can be sold to "qualified  institutional buyers" in accordance with
Rule 144A under the 1933 Act. These  securities will not be considered  illiquid
so long as the Investment Adviser  determines,  under guidelines approved by the
Trust's Board of Trustees, that an adequate trading market exists. This practice
could  increase  the level of  illiquidity  during  any  period  that  qualified
institutional  buyers become  uninterested in purchasing these securities.
Investment Restrictions

         Each Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below which may be changed with  respect to a  particular  Portfolio
only by a vote of the  holders of a  majority  of such  Portfolio's  outstanding
shares.

No Portfolio may:

          (1)  Make loans,  except for (a) the purchase of debt  obligations  in
               accordance   with  the  Portfolio's   investment   objective  and
               policies, (b) repurchase agreements with banks, brokers,  dealers
               and other financial institutions, (c) loans of securities and (d)
               loans to affiliates  of the portfolio to the extent  permitted by
               law.

          (2)  Purchase or sell real estate or securities  issued by real estate
               investment  trusts,  but this  restriction  shall  not  prevent a
               Portfolio  from  investing  directly or  indirectly  in portfolio
               instruments secured by real estate or interests therein.

          (3)  Purchase or sell commodities or commodity contracts,  except that
               a Portfolio may invest in currency and financial  instruments and
               contracts that are commodities or commodity contracts.

          (4)  Invest in  companies  for the  purpose of  exercising  control or
               management.

          (5)  Act as  underwriter  of securities  (except as a Portfolio may be
               deemed to be an  underwriter  under the Securities Act of 1933 in
               connection with the purchase and sale of portfolio instruments in
               accordance with its investment objective and portfolio management
               policies).

          (6)  Make   any   investment   inconsistent   with   the   Portfolio's
               classification as a diversified investment company under the 1940
               Act.

          (7)  Purchase securities if such purchase would cause more than 25% in
               the  aggregate  of the  market  value of the  total  assets  of a
               Portfolio to be invested in the securities of one or more issuers
               having their principal business  activities in the same industry,
               provided  that there is no  limitation  with respect to, and each
               Portfolio reserves freedom of action,  when otherwise  consistent
               with its investment  policies,  to concentrate its investments in
               obligations  issued or  guaranteed  by the U.S.  Government,  its
               agencies or instrumentalities, obligations (other than commercial
               paper) issued or guaranteed  by U.S.  banks and U.S.  branches of
               foreign banks and  repurchase  agreements  and  securities  loans
               collateralized by such U.S.  Government  obligations or such bank
               obligations.  For the  purpose  of this  restriction,  state  and
               municipal  governments and their agencies and authorities are not
               deemed  to be  industries;  as to  utility  companies,  the  gas,
               electric,  water and telephone businesses are considered separate
               industries; personal credit finance companies and business credit
               finance  companies  are  deemed to be  separate  industries;  and
               wholly-owned  finance  companies  are  considered  to be  in  the
               industries  of their  parents if their  activities  are primarily
               related to financing the activities of their parents.

          (8)  Borrow money,  except that to the extent  permitted by applicable
               law (a) the  Portfolios may borrow from banks,  other  affiliated
               investment companies and other persons, and may engage in reverse
               repurchase   agreements  and  other  transactions  which  involve
               borrowings,  in  amounts  up to  33-1/3%  of their  total  assets
               (including the amount  borrowed) or such percentage  permitted by
               law (b) the Portfolios may borrow up to an additional 5% of their
               total  assets for  temporary  purposes,  (c) the  Portfolios  may
               obtain  such  short-term  credits  as may be  necessary  for  the
               clearance of purchases and sales of portfolio securities, and (d)
               the  Portfolios  may  purchase  securities  on margin.  If due to
               market  fluctuations or other reasons the Portfolios'  borrowings
               exceed the  limitations  stated  above,  the Trust will  promptly
               reduce the  borrowings of such  Portfolio in accordance  with the
               1940 Act.  In  addition,  as a matter of  fundamental  policy,  a
               Portfolio  will not issue  senior  securities  to the extent such
               issuance would violate applicable law.

          (8)  Notwithstanding  any of the Trust's other fundamental  investment
               restrictions (including,  without limitation,  those restrictions
               relating to issuer  diversification,  industry  concentration and
               control),  each  Portfolio  may (a) purchase  securities of other
               investment  companies to the full extent  permitted under Section
               12 of the 1940 Act (or any successor  provision thereto) or under
               any   regulation  or  order  of  the   Securities   and  Exchange
               Commission; and (b) invest all or substantially all of its assets
               in a single  open-end  investment  company or series thereof with
               substantially  the  same  investment   objective,   policies  and
               fundamental restrictions as the Portfolio.

                                      * * *


     The freedom of action  reserved in  Restriction  No. 7 with respect to U.S.
branches of foreign banks is subject to the requirement that they are subject to
the same  regulation as domestic  branches of U.S.  banks.  Obligations  of U.S.
branches of foreign banks may include certificates of deposit,  bank and deposit
notes,  bankers'  acceptances and fixed time deposits.  These obligations may be
general  obligations of the parent bank or may be limited to the issuing branch.
Such obligations  will meet the criteria for "Eligible  Securities" as described
in the Prospectus.

     Also, as a matter of fundamental policy,  changeable only with the approval
of the  holders  of a  majority  of the  outstanding  shares  of the  Tax-Exempt
Portfolio  and  Municipal  Portfolio,  at  least  80% of the net  assets  of the
Portfolios  will be invested in debt  instruments,  the interest on which is, in
the opinion of bond counsel or counsel for issuers,  exempt from regular Federal
income tax, except in  extraordinary  circumstances  such as when the Investment
Adviser  believes that market  conditions  indicate that the  Portfolios  should
adopt a temporary  defensive posture by holding  uninvested cash or investing in
taxable securities.  Interest earned by the Tax-Exempt and Municipal  Portfolios
on "private  activity bonds" that is treated as an item of tax preference  under
Federal alternative minimum tax will be deemed to be exempt from regular Federal
income tax for purposes of  determining  whether the  Tax-Exempt  and  Municipal
Portfolios meet this fundamental policy.

         Securities  held in escrow or separate  accounts in connection with the
Municipal   Portfolio's   investment  practices  described  in  this  Additional
Statement  and in the  Prospectus  are not  deemed to be  mortgaged,  pledged or
hypothecated for purposes of the foregoing Investment Restrictions.

     Except to the extent  otherwise  provided in Investment  Restriction No. 7,
for the purpose of such restriction in determining  industry  classification the
Trust  intends  to use  the  industry  classification  titles  in the  Bloomberg
Industry Group Classifications.

     In applying  Restriction No. 7 above, a security is considered to be issued
by the entity,  or  entities,  whose assets and revenues  back the  security.  A
guarantee of a security is not deemed to be a security  issued by the  guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by a Portfolio,  does not exceed 10% of the value of the Portfolio's total
assets.

     Any restriction which involves a maximum  percentage will not be considered
violated unless an excess over the percentage occurs  immediately  after, and is
caused  by, an  acquisition  or  encumbrance  of  securities  or  assets  of, or
borrowings by, a Portfolio.

     The Portfolios  intend,  as a  non-fundamental  policy,  to diversify their
investments  in  accordance  with current SEC  regulations.  Investments  in the
securities of any single issuer (excluding cash, cash items,  certain repurchase
agreements,  U.S.  Government  securities  and  securities  of other  investment
companies)  will be  limited  to not more than 5% of the value of a  Portfolio's
total assets at the time of purchase,  except that 25% of the value of the total
assets of each Portfolio may be invested in the securities of any one issuer for
a period of up to three  Business  Days.  A security  that has an  unconditional
guarantee  meeting special SEC  requirements  (a  "Guarantee")  does not need to
satisfy the foregoing issuer  diversification  requirements that would otherwise
apply,  but the Guarantee is instead  subject to the  following  diversification
requirements: immediately after the acquisition of the security, a Portfolio may
not have invested  more than 10% of its total assets in securities  issued by or
subject to Guarantees from the same person, except that a Portfolio may, subject
to certain conditions, invest up to 25% of its total assets in securities issued
or subject to  Guarantees  of the same person.  This  percentage  is 100% if the
Guarantee is issued by the U.S.  Government or an agency  thereof.  In addition,
the Tax-Exempt and Municipal  Portfolios will limit their investments in certain
conduit  securities that are not rated in the highest short-term rating category
as determined by two  nationally  recognized  statistical  rating  organizations
(each an "NRSRO")  (or one NRSRO if the security is rated by only one NRSRO) or,
if unrated, are not of comparable quality to First Tier Securities ("Second Tier
Securities"), to 5% of its total assets, with investments in any one such issuer
being limited to no more than 1% of the Portfolio's  total assets or $1 million,
whichever  is greater,  measured  at the time of  purchase.  Conduit  securities
subject to this limitation are municipal  instruments  that are not subject to a
Guarantee and involve an arrangement whereunder a person, other than a municipal
issuer, provides for or secures repayment of the security and are not: (i) fully
and  unconditionally  guaranteed by a municipal issuer; or (ii) payable from the
general  revenues of the municipal issuer or other municipal  issuers;  or (iii)
related to a project owned and operated by a municipal  issuer;  or (iv) related
to a facility  leased to and under the control of an  industrial  or  commercial
enterprise  that is part of a public  project  which,  as a whole,  is owned and
under the control of a municipal issuer.  The Diversified  Assets Portfolio will
limit its investments in all Second Tier  Securities  (that are not subject to a
Guarantee) in  accordance  with the foregoing  percentage  limitations.

     In addition  to the  foregoing,  each  Portfolio  is subject to  additional
diversification  requirements  imposed by SEC  regulations on the acquisition of
securities subject to other types of demand features.

                          ADDITIONAL TRUST INFORMATION

Trustees and Officers

         The  business and affairs of the Trust and each  Portfolio  are managed
under the direction of the Trust's Board of Trustees.  Information pertaining to
the Trustees and officers of the Trust is set forth below.



<PAGE>

<TABLE>
<CAPTION>
<S><C>                                 <C>          <C>              <C>

Name                                                 Position(s)     Principal Occupation(s)
and Address                            Age            with Trust     During Past 5 Years

Stephen Timbers                        55****       Chairman    and  President of Northern Trust Global
                                                    Trustee          Investments, a division of Northern Trust
                                                                     Corporation since 1998; President, Chief
                                                                     Executive Officer and Director of Zurich
                                                                     Kemper Investments from 1996 to 1998;
                                                                     President and Chief Operating Officer of
                                                                     Kemper Corporation from 1992 to 1996;
                                                                     President and Director Kemper Funds from 1990
                                                                     to 1998.  Director: LTV Corporation. Trustee:
                                                                     Northern Funds.

Mr. Wesley M. Dixon, Jr.               72           Trustee          Director of Earl Kinship Capital Corporation
400 Skokie Blvd., Suite 300                                          since 1985, Vice Chairman and Director of G.D.
Northbrook, Illinois  60062                                          Searle & Co. (manufacture and sale of food
                                                                     products and pharmaceuticals) from 1977 to
                                                                     1983 and President of G.D. Searle & Co. prior
                                                                     thereto.  Trustee: Northern Funds.


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Mr. William J. Dolan, Jr.              67           Trustee          Partner of Arthur Andersen & Co. S.C.
1534 Basswood Circle                                                 (accounting firm) from 1966 until his
Glenview, Illinois  60025                                            retirement in December 1989.  Financial
                                                                     Consultant, Ernst & Young from 1992 to 1993
                                                                     and 1997. Director: Household Bank, First
                                                                     Central National Life Insurance Company and
                                                                     Director of First Central National Life
                                                                     Insurance Company since July 1998.  Trustee:
                                                                     Northern Funds.

Mr. Raymond E. George, Jr.             69*          Trustee          Senior Vice President and Senior Fiduciary
703 Prospect Avenue                                                  Officer of The Northern Trust Company from
Winnetka, Illinois  60093                                            1990 until his retirement in October 1993.
                                                                     Trustee: Northern Funds.

Mr. Michael E. Murphy                  63**         Trustee          President of Sara Lee Foundation since
Suite 2222                                                           November 1997.  Vice Chairman and Chief
20 South Clark Street                                                Administrative Officer of Sara Lee Corporation
Chicago, Illinois  60603                                             (consumer products) from November 1994 to
                                                                     October 1997; Vice Chairman and Chief
                                                                     Financial and Administrative Officer of Sara
                                                                     Lee Corporation from July 1993 to November
                                                                     1994. Director: Payless Shoe Source, Inc.,
                                                                     True North Communications, Inc., American
                                                                     General Corporation, GATX Corporation and
                                                                     Bassett Furniture Industries, Inc.  Trustee:
                                                                     Northern Funds.

Mary Jacobs Skinner, Esquire           42***        Trustee          Partner in the law firm of Sidley & Austin.
One First National Plaza                                             Trustee: Northern Funds.
Chicago, Illinois  06063


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

William H. Springer                    71           Trustee          Vice Chairman of Ameritech (a
701 Morningside Drive                                                telecommunications holding company) from
Lake Forest, IL 60045                                                February 1987 until his retirement in August
                                                                     1992; Vice Chairman, Chief Financial and
                                                                     Administrative Officer of Ameritech prior
                                                                     1987. Director of Walgreen Co. (a retail drug
                                                                     store business); Baker, Fentress & Co. (a
                                                                     closed-end, non-diversified management
                                                                     investment company). Trustee of Goldman Sachs
                                                                     Trust; Goldman Sachs Variable Insurance Trust.
                                                                     Trustee:  Northern Funds.

Richard G. Cline                       65           Trustee          Chairman, Hawthorne Investors, Inc. (a
4200 Commerce Court,                                                 management advisory services and private
Suite 300                                                            investment company) since January 1996;
Lisle, IL 60532                                                      Chairman, Hussman International, Inc. (a
                                                                     refrigeration company) since January 1998,
                                                                     Chairman and CEO of NICOR Inc. (a diversified
                                                                     public utility holding company) from 1986 to
                                                                     1995, and President, 1992-1993; Chairman,
                                                                     Federal Reserve Bank of Chicago from 1992 to
                                                                     1995; and Deputy Chairman from 1995 to 1996.
                                                                     Director: Whitman Corporation (a diversified
                                                                     holding company), Kmart Corporation (a
                                                                     retailing company), Ryerson Tull, Inc. (a
                                                                     metals distribution company) and University of
                                                                     Illinois Foundation. Trustee:  Northern Funds.


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Edward J. Condon, Jr.                  60           Trustee          Chairman of The Paradigm Group, Ltd. (a
Sears Tower, Suite 9650                                              financial advisor) since July 1993; Vice
233 S. Wacker Drive                                                  President and Treasurer of Sears, Roebuck and
Chicago, IL 60606                                                    Co. (retail corporation) from February 1989 to
                                                                     July 1993; Member of Advisory Board of
                                                                     Real-Time USA, Inc. (a software company);
                                                                     Member of the Board of Managers of The Liberty
                                                                     Hampshire Company, LLC (a receivable
                                                                     securitization company); Vice Chairman and
                                                                     Director of Energenics L.L.C. Director:
                                                                     University Eldercare, Inc.; Financial Pacific
                                                                     Company Trustee: Dominican University.
                                                                     Trustee:  Northern Funds.

John W. English                        67           Trustee          Private Investor; Vice President and Chief
50-H New England Ave.                                                Investment Officer of The Ford Foundation (a
P.O. Box 640                                                         charitable trust) from 1981 to 1993.  Trustee:
Summit, NJ 07902-0640                                                The China Fund, Inc., Select Sector SPDR
                                                                     Trust; WM Funds; American Red Cross in Greater
                                                                     New York; Mote Marine Laboratory (a non-profit
                                                                     marine research facility); and United Board
                                                                     for Christian Higher Education in Asia.
                                                                     Director: University of Iowa Foundation,
                                                                     Blanton-Peale Institutes of Religion and
                                                                     Health; Community Foundation of Sarasota
                                                                     County; Duke Management Company (an investment
                                                                     adviser); and John Ringling Centre Foundation.
                                                                     Trustee:  Northern Funds.

Sandra Polk Guthman                    56           Trustee          President and CEO of Polk Bros. Foundation (an
420 N. Wabash Avenue                                                 Illinois not-for-profit corporation) from 1993
Suite 204                                                            to present; Director of Business
Chicago, IL 60611                                                    Transformation from 1992-1993, and Midwestern
                                                                     Director of Marketing from 1988-1992, IBM (a
                                                                     technology company); Director: MBIA Insurance
                                                                     Corporation of Illinois (bank holding
                                                                     company); MB Financial Corp. (a bank holding
                                                                     company). Trustee:  Northern Funds.

Richard P. Strubel                     61           Trustee          President and Chief Operating Officer,
737 N. Michigan Avenue                                               Unext.com since 1999; Managing Director of
Suite 1405                                                           Tandem Partners, Inc. (a privately held
Chicago, IL 60611                                                    management services firm) since 1990 to 1999;
                                                                     President and Chief Executive Officer,
                                                                     Microdot, Inc. (a privately held manufacturing
                                                                     firm) from 1984 to 1994; Director: Gildan
                                                                     Activewear, Inc.; Children's Memorial Medical
                                                                     Center. Trustee:  University of Chicago;
                                                                     Goldman Sachs Trust; Goldman Sachs Variable
                                                                     Insurance Trust. Trustee:  Northern Funds.

Jylanne M. Dunne                       40           President        Senior Vice President for Distribution
4400 Computer Drive                                                  Services at PFPC Inc. ("PFPC") (formerly First
Westborough, MA 01581                                                Data Investor Services Group, Inc. ("FDISG"))
                                                                     (since 1988).

Richard H. Rose                        44           Vice President   Vice President and Division Manager of Mutual
4400 Computer Drive                                                  Fund Administration at PFPC (formerly FDISG)
Westborough, MA 01581                                                (since 1994).


<PAGE>



Name                                                Position(s)      Principal Occupation(s)
and Address                            Age          with Trust       During Past 5 Years

Brian R. Curran                        32           Treasurer        Director of Fund Administration at PFPC
4400 Computer Drive                                                  (formerly FDISG) (since 1997); Director of
Westborough, MA 01581                                                Fund Administration at State Street Bank &
                                                                     Trust Company ( February 1997     to
                                                                     October 1997); Senior Auditor  at
                                                                     Price  Waterhouse L.L.P. (February
                                                                     1994     to  February
                                                                     1997).

Suzanne E. Anderson                    27           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC Inc. (since August
Westborough, MA 01581                                                1998); Manager of Fund Administration at State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1996     to
                                                                     August
                                                                     1998); Fund
                                                                     Administrator
                                                                     at    State
                                                                     Street Bank
                                                                     &     Trust
                                                                     Company
                                                                     (October
                                                                     1995     to
                                                                     October
                                                                     1996);
                                                                     Mutual Fund
                                                                     Accountant
                                                                     at      The
                                                                     Boston
                                                                     Company
                                                                     (prior
                                                                     thereto).

Judith E. Clear                        33           Assistant        Client Treasury Manager of Mutual Fund
4400 Computer Drive                                 Treasurer        Administration at PFPC since 1997; Compliance
Westborough, MA 01581                                                Manager at Citizens Trust from 1994 to 1996.

Linda J. Hoard                         52           Secretary        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                                  1998); Attorney Consultant for Fidelity
Westborough, MA 01581                                                Management & Research (a financial service
                                                                     company);
                                                                     Investors
                                                                     Bank      &
                                                                     Trust
                                                                     Company  (a
                                                                     financial
                                                                     service
                                                                     provider)
                                                                     and   FDISG
                                                                     (September
                                                                     1994     to
                                                                     June 1998).

Teresa M.R. Hamlin                     35           Assistant        Vice President at PFPC (formerly FDISG) (since
4400 Computer Drive                                 Secretary        1994).
Westborough, MA 01581

Therese Hogan                          37           Assistant        Director of the State Regulation Department at
4400 Computer Drive                                 Secretary        PFPC (formerly FDISG) (since 1994).
Westborough, MA 01581
</TABLE>

*        Mr. George is deemed to be an "interested" Trustee because he owns
shares of Northern Trust Corporation.
**       Mr. Murphy is deemed to be an "interested" Trustee because he owns
shares of Northern Trust Corporation.
***      Ms. Skinner is deemed to be an "interested" Trustee because her law
firm provides legal services to Northern Trust Corporation.
****     Mr. Timbers is deemed to be an "interested" Trustee because he is an
officer, director, employee and shareholder of Northern Trust Corporation.


         Certain of the Trustees and officers and the  organizations  with which
they  are  associated  have  had  in the  past,  and  may  have  in the  future,
transactions with Northern,  PFPC (formerly FDISG), Northern Funds Distributors,
LLC ("NFD"), and their respective affiliates. The Trust has been advised by such
Trustees and officers that all such  transactions  have been and are expected to
be in the  ordinary  course  of  business  and the  terms of such  transactions,
including  all loans and loan  commitments  by such  persons,  have been and are
expected to be  substantially  the same as the  prevailing  terms for comparable
transactions for other customers. As a result of the responsibilities assumed by
Northern under its Advisory  Agreement,  Transfer  Agency  Agreement,  Custodian
Agreement,  Foreign Custody Agreement and  Co-Administration  Agreement with the
Trust, by PFPC under its  Co-Administration  Agreement with the Trust and by NFD
under its  Distribution  Agreement with the Trust,  the Trust itself requires no
employees.

         Each officer holds  comparable  positions with certain other investment
companies of which NFD, PFPC or an affiliate thereof is the investment  adviser,
administrator and/or distributor.

         Additionally,   the  Trust,   its  investment   adviser  and  principal
underwriter  have  adopted  codes of ethics (the  "Codes of Ethics")  under rule
17j-1 of the 1940 Act.  The Codes of Ethics  permit  personnel,  subject  to the
Codes of  Ethics  and their  provisions,  to  invest  in  securities,  including
securities that may be purchased or held by the Trust.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In  addition,   the  Trustees  have   established  an  Audit  Committee
consisting  of two  members  including a Chairman  of the  Committee.  The Audit
Committee members are Messrs. Condon and Strubel (Chairman). Each member earns a
fee of $2,500 for each  meeting  attended  and the  Chairman  earns a  quarterly
retainer of $1,500.

         Each Trustee will hold office for an indefinite term until the earliest
of (1) the next  meeting of  shareholders,  if any,  called  for the  purpose of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust, or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

     The Trust's  officers do not  receive  fees from the Trust for  services in
such capacities,  although PFPC, of which they are also officers,  receives fees
from the Trust for administrative services.


         The following table sets forth certain  information with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1999:

<TABLE>
<CAPTION>
<S><C>                          <C>           <C>               <C>          <C>               <C>            <C>
                                                                                                         Total
                                 Government                     Diversified                              Compensation
                                   Select     Government        Assets        Municipal         Tax-Exempt    from Fund
                                  Portfolio   Portfolio         Portfolio     Portfolio1***     Portfolio     Complex

Stephen B. Timbers**            0              0                0             n/a               0                0
William H. Springer             7,950          6,890            19,610        n/a               3,180            53,000
Richard G. Cline                5,925          5,135            14,615        n/a               2,370            44,500
Edward J. Condon, Jr.           6,675          5,785            16,465        n/a               2,670            39,500
John W. English                 5,925          5,135            14,615        n/a               2,370            39,500
Sandra Polk Guthman             5,925          5,135            14,615        n/a               2,370            39,500
Frederick T. Kelsey*            6,675          5,785            16,465        n/a               2,670            44,500
Richard P. Strubel              7,575          6,565            18,685        n/a               3,030            50,500
Wesley M. Dixon, Jr.**          0              0                0             n/a               0                22,500
William J. Dolan, Jr.**         0              0                0             n/a               0                22,500
Raymond E. George, Jr.**        0              0                0             n/a               0                21,250
Michael E. Murphy**             0              0                0             n/a               0                22,500
Mary Jacobs Skinner**           0              0                0             n/a               0                22,500
</TABLE>

     * Frederick Kelsey retired from the Board of Trustees on November 30, 1999.

     ** Not a Trustee  of the  Northern  Institutional  Funds  during the period
ended  November 30, 1999.

     *** Municipal Portfolio did not commence operations during the period.


The Trust does not provide pension or retirement benefits to its Trustees.

Investment Adviser, Transfer Agent and Custodian

         Northern  Trust Company (the  "Investment  Adviser" or  "Northern"),  a
wholly-owned  subsidiary of Northern Trust Corporation,  a bank holding company,
is one of the  nation's  leading  providers of trust and  investment  management
services.  As of December 31, 1999,  Northern and its affiliates had over $299.1
billion in assets  under  management  for clients  including  public and private
retirement   funds,   endowments,   foundations,   trusts,   corporations,   and
individuals.  Northern  is one of the  strongest  banking  organizations  in the
United  States.  Northern  believes  it has built its  organization  by  serving
clients with integrity,  a commitment to quality,  and personal  attention.  Its
stated  mission  with respect to all its  financial  products and services is to
achieve unrivaled client  satisfaction.  With respect to such clients, the Trust
is designed to assist (i) defined contribution plan sponsors and their employees
by  offering a range of diverse  investment  options to help  comply with 404(c)
regulation and may also provide  educational  material to their employees,  (ii)
employers  who  provide  post-retirement   Employees'  Beneficiary  Associations
("VEBA")  and  require  investments  that  respond  to  the  impact  of  Federal
regulations,  (iii)  insurance  companies  with  the  day-to-day  management  of
uninvested cash balances as well as with longer-term  investment needs, and (iv)
charitable and not-for-profit organizations, such as endowments and foundations,
demanding  investment  management  solutions  that balance the  requirement  for
sufficient  current income to meet  operating  expenses and the need for capital
appreciation to meet future investment objectives.

         Northern  employs a team approach to the  investment  management of the
Portfolios,  relying upon investment professionals under the leadership of James
M. Snyder, Chief Investment Officer and Executive Vice President of Northern.

         Under its Advisory Agreement with the Trust,  Northern,  subject to the
general supervision of the Trust's Board of Trustees,  is responsible for making
investment decisions for each Portfolio and placing purchase and sale orders for
the portfolio  transactions  of the  Portfolios.  In connection  with  portfolio
transactions for the Portfolios, which are generally done at a net price without
a broker's  commission,  Northern's  Advisory  Agreement  provides that Northern
shall attempt to obtain the best net price and execution.

         Northern's  investment  advisory  duties for the Trust are  carried out
through its Trust  Department.  On occasions when Northern deems the purchase or
sale of a security to be in the best  interests  of a Portfolio as well as other
fiduciary  or agency  accounts  managed by it  (including  any other  Portfolio,
investment  company  or  account  for  which  Northern  acts  as  adviser),  the
Investment Advisory Agreement provides that Northern, to the extent permitted by
applicable  laws and  regulations,  may aggregate  the  securities to be sold or
purchased for such  Portfolio  with those to be sold or purchased for such other
accounts  in order to  obtain  best net  price  and  execution.  In such  event,
allocation  of the  securities  so  purchased  or sold,  as well as the expenses
incurred in the transaction, will be made by Northern in the manner it considers
to be most  equitable  and  consistent  with its  fiduciary  obligations  to the
Portfolio and other accounts  involved.  In some  instances,  this procedure may
adversely  affect the size of the  position  obtainable  for a Portfolio  or the
amount of the securities that are able to be sold for a Portfolio. To the extent
that the execution and price  available  from more than one broker or dealer are
believed to be comparable,  the Investment  Advisory Agreement permits Northern,
at its discretion but subject to applicable law, to select the executing  broker
or dealer on the basis of Northern's  opinion of the  reliability and quality of
such broker or dealer.

         The  Advisory  Agreement  provides  that  Northern  may render  similar
services to others so long as its services under such Agreement are not impaired
thereby.  The Advisory  Agreement  also provides  that the Trust will  indemnify
Northern against certain  liabilities  (including  liabilities under the Federal
securities laws relating to untrue  statements or omissions of material fact and
actions  that are in  accordance  with the terms of the  Agreement)  or, in lieu
thereof, contribute to resulting losses.

         Under its  Transfer  Agency  Agreement  with the  Trust,  Northern  has
undertaken to (1) answer customer inquiries  regarding the current yield of, and
certain other matters  (e.g.  account  status  information)  pertaining  to, the
Trust, (2) process purchase and redemption transactions,  including transactions
generated by any service  provided  outside of the  Agreement  by Northern,  its
affiliates or  correspondent  banks whereby  customer  account cash balances are
automatically invested in shares of the Portfolios,  and the disbursement of the
proceeds of redemptions,  (3) establish and maintain  separate  omnibus accounts
with respect to shareholders investing through Northern or any of its affiliates
and  correspondent  banks and act as transfer  agent and perform  sub-accounting
services  with respect to each such  account,  (4) provide  periodic  statements
showing account balances,  (5) mail reports and proxy materials to shareholders,
(6) provide  information  in  connection  with the  preparation  by the Trust of
various  regulatory  reports and prepare reports to the Trustees and management,
(7) answer  inquiries  (including  requests for  prospectuses  and statements of
additional  information,  and  assistance  in  the  completion  of  new  account
applications)  from  investors  and  respond  to all  requests  for  information
regarding the Trust (such as current price, recent performance,  and yield data)
and  questions  relating to accounts of  investors  (such as possible  errors in
statements, and transactions), (8) respond to and seek to resolve all complaints
of investors  with  respect to the Trust or their  accounts,  (9) furnish  proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution and tax notices to investors, (10) furnish the Trust all
pertinent Blue Sky information,  (11) perform all required tax withholding, (12)
preserve  records,  and (13) furnish  necessary  office  space,  facilities  and
personnel.  Northern  may  appoint  one  or  more  sub-transfer  agents  in  the
performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement  with respect to Service  Shares and Premier  Shares
described in this Additional Statement and the assumption by Northern of related
expenses,  Northern is entitled  to a fee from the Trust,  calculated  daily and
payable  monthly,  at the following  annual rates: (i) .01% of the average daily
net asset value of the outstanding  Service Shares of each  Portfolio;  and (ii)
 .02% of the average daily net asset value of the  outstanding  Premier Shares of
each Portfolio.  The transfer agency fee attributable to each class of shares is
borne solely by that class.  Northern's  affiliates and correspondent  banks may
receive  compensation  for  performing  the services  described in the preceding
paragraph   that  Northern   would   otherwise   receive.   Conflict-of-interest
restrictions  under state and Federal law  (including  the  Employee  Retirement
Income  Security  Act of 1974) may apply to the  receipt by such  affiliates  or
correspondent  banks of such  compensation  in connection with the investment of
fiduciary funds in Service Shares and Premier Shares of the Portfolios.

         Under its Custodian  Agreement with the Trust,  Northern (1) holds each
Portfolio's  cash and  securities,  (2)  maintains  such cash and  securities in
separate  accounts  in the  name  of  the  Portfolio,  (3)  makes  receipts  and
disbursements  of funds on behalf of the Portfolio,  (4) receives,  delivers and
releases  securities on behalf of the  Portfolio,  (5) collects and receives all
income,  principal and other payments in respect of the  Portfolio's  securities
held by Northern under the Custodian Agreement, and (6) maintains the accounting
records of the Trust.  Northern may employ one or more  subcustodians,  provided
that Northern,  subject to certain  monitoring  responsibilities,  shall have no
more  responsibility  or  liability  to the Trust on  account  of any  action or
omission of any subcustodian so employed than such  subcustodian has to Northern
and that the  responsibility  or liability of the subcustodian to Northern shall
conform  to  the  resolution  of  the  Trustees  of the  Trust  authorizing  the
appointment of the particular subcustodian.  Northern may also appoint agents to
carry out such of the provisions of the Custodian Agreement as Northern may from
time to time direct, provided that the appointment of an agent shall not relieve
Northern of any of its responsibilities under the Agreement.

         As compensation  for the services  rendered to the Trust by Northern as
custodian, and the assumption by Northern of certain related expenses,  Northern
is entitled to payment from the Trust as follows:  (i) $18,000 annually for each
Portfolio,  plus (ii) 1/100th of 1% annually of each  Portfolio's  average daily
net assets to the extent they exceed $100 million, plus (iii) a fixed dollar fee
for each trade in  portfolio  securities,  plus (iv) a fixed dollar fee for each
time that Northern as custodian  receives or transmits  funds via wire, plus (v)
reimbursement  of expenses  incurred by Northern  as  custodian  for  telephone,
postage, courier fees, office supplies and duplicating.  The fees referred to in
clauses  (iii)  and (iv) are  subject  to  annual  upward  adjustments  based on
increases in the Consumer  Price Index for All Urban  Consumers,  provided  that
Northern may  permanently or temporarily  waive all or any portion of any upward
adjustment.

     Northern's  fees under the  Custodian  Agreement  are subject to  reduction
based on the Portfolios' daily uninvested cash balances (if any).

         Unless  sooner  terminated,  each of the Advisory  Agreement,  Transfer
Agency  Agreement and Custodian  Agreement  between  Northern and the Trust will
continue in effect with respect to a particular  Portfolio until April 30, 2000,
and thereafter for successive 12-month periods, provided that the continuance is
approved at least annually (1) by the vote of a majority of the Trustees who are
not parties to the agreement or "interested persons" (as such term is defined in
the 1940 Act) of any party  thereto,  cast in person at a meeting called for the
purpose of voting on such  approval  and (2) by the Trustees or by the vote of a
majority of the  outstanding  shares of such  Portfolio  (as defined below under
"Other  Information").  Each agreement is terminable at any time without penalty
by the Trust (by  specified  Trustee or  shareholder  action) on 60 days written
notice to Northern and by Northern on 60 days written notice to the Trust.

         For the fiscal  years  ended  November 30 as  indicated,  the amount of
advisory fees incurred by each Portfolio (except Municipal Portfolio,  which did
not commence operations during the period) (after fee waivers) was as follows:
<TABLE>
<CAPTION>
<S><C>                                                  <C>                      <C>                 <C>

                                                                  1999                 1998                 1997

Government Select Portfolio                              $   1,551,000           $1,460,037          $ 1,018,270
Government Portfolio                                         3,589,000            3,337,292            3,243,435
Diversified Assets Portfolio                                13,142,000           10,271,332            8,945,126
Tax-Exempt Portfolio                                         1,502,000            1,712,721            1,731,407

</TABLE>


     In addition,  for the fiscal years ended November 30, 1999,  1998 and 1997,
Northern waived advisory fees with respect to the Government Select Portfolio in
the amounts of $2,786,104, $2,193,181 and $1,527,701, respectively.

         For the fiscal  years  ended  November 30 as  indicated,  the amount of
transfer  agency fees incurred by each Portfolio  (except  Municipal  Portfolio,
which did not commence operations during the period) was as follows:

<TABLE>
<CAPTION>
<S><C>                                                    <C>                    <C>                    <C>

                                                                1999                  1998                 1997

Government Select Portfolio                                $   35,078            $ 28,041              $30,361
Government Portfolio                                           36,436              51,087               35,042
Diversified Assets Portfolio                                  153,309             182,267              127,270
Tax-Exempt Portfolio                                           22,320              28,191               22,028
</TABLE>

         For the fiscal  years  ended  November 30 as  indicated,  the amount of
custodian fees incurred by each Portfolio (except Municipal Portfolio, which did
not commence operations during the period) was as follows:

<TABLE>
<CAPTION>
<S>                                                          <C>                <C>                   <C>

                                                                1999                  1998                1997

Government Select Portfolio                                  $  205,435          $ 181,920              $ 97,683
Government Portfolio                                            176,812            179,186               140,110
Diversified Assets Portfolio                                    577,833            425,371               412,075
Tax-Exempt Portfolio                                             90,540             86,026               100,513
</TABLE>


         Northern is active as an  underwriter of municipal  instruments.  Under
the 1940 Act, the Portfolios are precluded,  subject to certain exceptions, from
purchasing in the primary  market those  municipal  instruments  with respect to
which  Northern  is  serving  as a  principal  underwriter.  In the  opinion  of
Northern,  this  limitation  will not  significantly  affect the  ability of the
Portfolios to pursue their respective investment objectives.

         Under a Service  Mark  License  Agreement  (the  "Agreement")  with the
Trust,   Northern  Trust   Corporation   has  agreed  that  the  name  "Northern
Institutional  Funds" may be used in connection  with the Trust's  business on a
royalty-free basis.  Northern Trust Corporation has reserved to itself the right
to grant the non-exclusive right to use the name "Northern  Institutional Funds"
to any other person.  The Agreement  provides that at such time as the Agreement
is no  longer  in  effect,  the  Trust  will  cease  using  the  name  "Northern
Institutional Funds."

Portfolio Transactions

         For the fiscal  years  ended  November  30,  1999,  1998 and 1997,  all
portfolio  transactions  for the Portfolios  were executed on a principal  basis
and, therefore, no brokerage commissions were paid by the Portfolios.  Purchases
by the Portfolios from underwriters of portfolio securities,  however,  normally
include a commission or concession  paid by the issuer to the  underwriter,  and
purchases from dealers  include the spread between the dealer's cost for a given
security and the resale price of the security.

         During the fiscal year ended November 30, 1999, the Diversified  Assets
Portfolio acquired and sold securities of Bear Sterns & Co., Morgan Stanley Dean
Witter & Co.,  and  Lehman  Brothers,  Inc.,  each a regular  broker/dealer.  At
November 30, 1999, the Diversified  Assets Portfolio owned the following amounts
of securities of its regular broker/dealers,  as defined in Rule 10b-1 under the
1940  Act,  or  their  parents:  Morgan  Stanley  Dean  Witter  & Co.,  with  an
approximate aggregate market value of $36,619,000.

         During  the  fiscal  year  ended  November  30,  1999,  the  Government
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

     During the fiscal year ended  November  30,  1999,  the  Government  Select
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

         During  the  fiscal  year  ended  November  30,  1999,  the  Tax-Exempt
Portfolio  did  not  acquire,   sell  or  own  any  securities  of  its  regular
broker/dealers or their parents.

     During the fiscal year ended November 30, 1999, the Municipal Portfolio had
not yet commenced operations.

Co-Administrators and Distributor

         Effective  May 1,  1999,  Northern  and  PFPC  (formerly  FDISG),  4400
Computer Drive,  Westborough,  Massachusetts 01581, act as co-administrators for
the Portfolios under a  Co-Administration  Agreement with the Trust.  Subject to
the general  supervision  of the Trust's  Board of  Trustees,  Northern and PFPC
(formerly FDISG) (the "Co-Administrators") provide supervision of all aspects of
the Trust's  non-investment  advisory  operations and perform various  corporate
secretarial,  treasury and blue sky services,  including but not limited to: (a)
maintaining  office facilities and furnishing  corporate officers for the Trust;
(b) furnishing data processing  services,  clerical services,  and executive and
administrative  services  and  standard  stationery  and  office  supplies;  (c)
performing  all  functions  ordinarily  performed  by the office of a  corporate
treasurer,  and  furnishing  the services  and  facilities  ordinarily  incident
thereto,  such as expense  accrual  monitoring and payment of the Trust's bills,
preparing  monthly  reconciliation  of the  Trust's  expense  records,  updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  Federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to  their  customers  who are the  beneficial  owners  of  shares,  pursuant  to
servicing agreements between the Trust and such Servicing Agents.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators are entitled to a fee from each Portfolio,  computed daily and
payable  monthly,  at an annual rate of .10% of the average  daily net assets of
each  Portfolio.  The  Co-Administrators  will  reimburse each Portfolio for its
expenses (including  administration fees payable to the  Co-Administrators,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceed on an annualized basis .10% of each  Portfolio's  average
daily net assets.

         For the period May 1, 1999,  through the fiscal year ended November 30,
1999,   PFPC   (formerly   FDISG)  and  Northern   received   fees  under  their
co-administration  agreement with the Trust (after fee waivers)  (except for the
Municipal  Portfolio which did not commence operations during the period) in the
amount of:

                                                 May 1, 1999 -
                                                 November 30, 1999

Government Select Portfolio                     $  786,966
Government Portfolio                               670,580
Diversified Assets Portfolio                     2,747,512
Tax-Exempt Portfolio                               193,364


         Prior to May 1, 1999, Goldman,  Sachs & Co. ("Goldman Sachs"), 85 Broad
Street, New York, New York 10004, acted as the Trust's administrator pursuant to
an  administration  agreement  substantially  similar  to the  Co-Administration
Agreement  currently in effect with Northern and PFPC (formerly FDISG).  For the
fiscal years ended  November 30 as indicated,  Goldman Sachs received fees under
its  administration  agreement  with the Trust (after fee waivers) in the amount
of:
<TABLE>
<CAPTION>
<S><C>                                      <C>                              <C>                       <C>

                                            December 1, 1998
                                            through April 30, 1999                1998                   1997

Government Select Portfolio                               $  524,613          $1,460,037               $1,048,482
Government Portfolio                                         390,578           1,334,907                1,208,401
Diversified Assets Portfolio                               1,317,956           4,108,503                3,082,370
Tax-Exempt Portfolio                                         195,956             685,084                  749,232
</TABLE>

     In addition,  pursuant to an  undertaking  that  commenced  August 1, 1992,
Goldman  Sachs  had  agreed  that,  if its  administration  fees  (less  expense
reimbursements  paid by Goldman  Sachs to the Trust and less  certain  marketing
expenses paid by Goldman  Sachs)  exceed a specified  amount ($1 million for the
Trust's  first twelve  investment  portfolios  plus $50,000 for each  additional
portfolio)  during the current fiscal year,  Goldman Sachs would waive a portion
of its  administration  fees during the  following  fiscal  year.  There were no
waivers by Goldman Sachs pursuant to this agreement during the last three fiscal
years.

         Prior to  April 1,  1998,  Goldman  Sachs  had  voluntarily  agreed  to
reimburse  each  Portfolio for its expenses  (including  fees payable to Goldman
Sachs as  administrator,  but  excluding  the fees  payable to Northern  for its
duties as investment  adviser and  extraordinary  expenses) which exceeded on an
annualized basis .10% of each Portfolio's average daily net assets.

         For the fiscal  years  ended  November 30 as  indicated,  the effect of
these  reimbursements  by  Goldman  Sachs was to reduce  other  expenses  by the
following amounts:


<TABLE>
<CAPTION>
<S>                                     <C>                      <C>                                <C>
                                    December 1,
                                      1998 through
                                     April 30, 1999                1998                               1997

Government Select Portfolio                                         $544,124                        $360,250
Government Portfolio                                                  606,764                        262,895
Diversified Assets Portfolio                                        1,328,789                        477,791
Tax-Exempt Portfolio                                                  279,774                        305,530
</TABLE>




<PAGE>



         Effective April 1, 1998,  (upon the offering of the Service and Premier
Shares),  Goldman  Sachs had  agreed to  reimburse  expenses  of each  Portfolio
(including  fees payable to Goldman  Sachs as  administrator,  but excluding the
fees payable to Northern for its duties as adviser and transfer agent,  payments
under the service plan  (described  below) for Service and Premier  Shares,  and
certain extraordinary expenses) which exceed on an annualized basis .10% of each
Portfolio's average daily net assets.


         Unless  sooner  terminated,   the  Co-Administration   Agreement  among
Northern,  PFPC and the Trust will continue in effect until April 30, 2001,  and
thereafter  for  successive  one-year  terms  with  respect  to each  Portfolio,
provided that the Agreement is approved annually (1) by the Board of Trustees or
(2) by the vote of a majority of the  outstanding  shares of such  Portfolio (as
defined  below under  "Other  Information"),  provided  that in either event the
continuance  is also  approved by a majority of the Trustees who are not parties
to the Agreement and who are not interested persons (as defined in the 1940 Act)
of any party thereto, by vote cast in person at a meeting called for the purpose
of voting on such approval. The Co-Administration Agreement is terminable at any
time  after  April 30,  2001,  without  penalty by the Trust on at least 60 days
written notice to the Co-Administrators. Each Co-Administrator may terminate the
Co-Administration  Agreement  with respect to itself at any time after April 30,
2001  without  penalty on at least 60 days  written  notice to the Trust and the
other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30, 2001 in the event that the Trust or its shareholders incur damages in excess
of $100,000 as a result of the willful  misfeasance,  bad faith or negligence of
the  Co-Administrators,  or the  reckless  disregard  of their  duties under the
Agreement. The Trust may also terminate the Co-Administration Agreement prior to
April 30, 2001 in the event that the  Co-Administrators  fail to meet one of the
performance standards set forth in the Agreement.

         The Trust has entered into a  Distribution  Agreement  with NFD,  under
which NFD, as agent,  sells shares of each Portfolio on a continuous  basis. NFD
pays the cost of printing and  distributing  prospectuses to persons who are not
shareholders of the Trust (excluding  preparation and typesetting  expenses) and
of certain other distribution  efforts.  No compensation is payable by the Trust
to NFD for such  distribution  services.  NFD is a  wholly-owned  subsidiary  of
Provident   Distributors,   Inc.  ("PDI").  PDI,  based  in  West  Conshohocken,
Pennsylvania, is an independently owned and operated broker-dealer.  Between May
1, 1999 and November 30, 1999, First Data  Distributors  Inc.  ("FDDI") acted as
the Trust's  distributor  pursuant  to a  distribution  agreement  substantially
similar to the Distribution Agreement currently in effect with NFD. Prior to May
1,  1999,  Goldman  Sachs  acted  as  the  Trust's  distributor  pursuant  to  a
distribution  agreement  substantially  similar  to the  Distribution  Agreement
currently in effect with NFD.

         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust  will  indemnify  NFD  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by NFD, or those resulting from the willful misfeasance, bad faith or negligence
of NFD, or NFD's breach of confidentiality.


         Under a Service Mark License  Agreement (the "License  Agreement") with
NFD,  Northern Trust  Corporation  agrees that the name "Northern  Institutional
Funds" may be used in connection with Northern  Institutional Funds' business on
a  royalty-free  basis.  Northern Trust  Corporation  has reserved to itself the
right to grant the non-exclusive right to use the name ("Northern  Institutional
Funds") to any other person. The License Agreement provides that at such time as
the  License  Agreement  is no longer in effect  NFD will  cease  using the name
"Northern Institutional Funds."

Counsel and Auditors

     Drinker  Biddle & Reath LLP,  with  offices at One Logan  Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.


         __________________, independent auditors, 233 S. Wacker Drive, Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit services, _____________ reviews the Trust's Federal and state tax returns,
and provides  consultation  and assistance on accounting,  internal  control and
related matters.

In-Kind Purchases and Redemptions

         Payment for Service Shares and Premier Shares of the Portfolios may, in
the  discretion  of  Northern,  be  made  in the  form of  securities  that  are
permissible  investments for the Portfolio as described in the  Prospectus.  For
further information about this form of payment,  contact Northern. In connection
with an in-kind  securities  payment,  a  Portfolio  will  require,  among other
things,  that the securities be valued on the day of purchase in accordance with
the  pricing  methods  used by the  Portfolio  and  that the  Portfolio  receive
satisfactory  assurances  that it will  have  good and  marketable  title to the
securities received by it; that the securities be in proper form for transfer to
the Portfolio;  and that adequate  information be provided  concerning the basis
and other tax matters relating to the securities.

         Although  each  Portfolio  generally  will  redeem  Service  Shares and
Premier Shares in cash, each Portfolio  reserves the right to pay redemptions by
a distribution in-kind of securities (instead of cash) from such Portfolio.  The
securities  distributed  in-kind would be readily marketable and would be valued
for this purpose using the same method  employed in calculating  the Portfolio's
net  asset  value per  share.  If a  shareholder  receives  redemption  proceeds
in-kind,  the  shareholder  should  expect to incur  transaction  costs upon the
disposition of the securities received in the redemption.

Third-Party Fees and Requirements


         Service and Premier  Shares are sold and redeemed  without any purchase
or  redemption  charge  imposed  by  the  Trust,  although  Northern  and  other
institutions may charge their customers for services provided in connection with
their investments.

         The  exercise  of  voting  rights  and the  delivery  to  Customers  of
shareholder  communications  from the Trust will be governed  by the  Customers'
account  agreements with the Institutions.  Customers should read the Prospectus
in connection with any relevant agreement describing the services provided by an
Institution and any related requirements and charges, or contact the Institution
at which the Customer maintains its account for further information.

                             PERFORMANCE INFORMATION

         The  performance of a class of shares of a Portfolio may be compared to
those of other money market funds with similar  investment  objectives and other
relevant  indices or to  rankings  prepared  by  independent  services  or other
financial or industry publications that monitor the performance of mutual funds.
For  example,  the  performance  of a class of shares  may be  compared  to data
prepared by IBC Financial Data, Inc. or other independent  mutual fund reporting
services.  Performance data as reported in national financial  publications such
as Money Magazine,  Morningstar,  Forbes,  Barron's, The Wall Street Journal and
The New York Times, or in publications of a local or regional  nature,  may also
be used in comparing the performance of a class of shares of a Portfolio.

         From time to time,  the  Portfolios  may advertise  their  "yields" and
"effective yields", and the Government Select Portfolio, Municipal Portfolio and
Tax-Exempt   Portfolio  may   advertise   their   "tax-equivalent   yields"  and
"tax-equivalent  effective yields". Yield, effective yield, tax equivalent yield
and  tax-equivalent  effective  yield are computed  separately for each class of
shares. Each class of shares has different fees and expenses,  and consequently,
may have  different  yields  for the  same  period.  These  yield  figures  will
fluctuate,  are based on  historical  earnings  and are not intended to indicate
future performance.  "Yield" refers to the net investment income generated by an
investment  in  the  Portfolio  over  a  seven-day  period   identified  in  the
advertisement.  This net investment  income is then  "annualized."  That is, the
amount of net investment  income generated by the investment during that week is
assumed  to be  generated  each  week over a  52-week  period  and is shown as a
percentage of the investment.

         In  arriving  at  such  quotations  as  to  "yield,"  the  Trust  first
determines the net change,  exclusive of capital  changes,  during the seven-day
period in the value of a hypothetical  pre-existing  account having a balance of
one Service Share or Premier Share at the beginning of the period,  then divides
such net change by the value of the  account at the  beginning  of the period to
obtain the base period  return,  and then  multiplies  the base period return by
365/7.

         "Effective yield" is calculated similarly but, when annualized, the net
investment  income  earned by an  investment  in the  Portfolio is assumed to be
reinvested.  The  "effective  yield"  will be  slightly  higher than the "yield"
because of the compounding effect of this assumed  reinvestment.  The "effective
yield" with respect to the Service  Shares and Premier  Shares of a Portfolio is
computed by adding 1 to the base period return  (calculated  as above),  raising
the sum to a power equal to 365 divided by 7, and subtracting 1 from the result.

         The  "tax-equivalent  yield"  demonstrates  the level of taxable  yield
necessary to produce an after-tax  yield  equivalent to a  Portfolio's  tax-free
yield. It is calculated by taking that portion of the seven-day "yield" which is
tax-exempt and adjusting it to reflect the tax savings  associated with a stated
tax rate.  The  "tax-equivalent  current  yield"  will always be higher than the
Portfolio's yield.

         "Tax-equivalent  yield" is computed by dividing the tax-exempt  portion
of the yield by 1 minus a stated  income tax rate,  and then adding the quotient
to the  taxable  portion  of the  yield,  if any.  There  may be more  than  one
tax-equivalent current yield, if more than one stated income tax rate is used.

         The "tax-equivalent  effective yield" demonstrates the level of taxable
yield  necessary  to produce an  after-tax  yield  equivalent  to a  Portfolio's
tax-free  effective  yield.  It is  calculated  by taking  that  portion  of the
seven-day  "effective yield" which is tax-exempt and adjusting it to reflect the
tax savings  associated  with a stated tax rate. The  "tax-equivalent  effective
yield" will always be higher than the Portfolio's effective yield.

         "Tax-equivalent effective yield" is computed by dividing the tax-exempt
portion of the  effective  yield by 1 minus a stated  income tax rate,  and then
adding the quotient to the taxable portion of the effective yield, if any. There
may be more than one  tax-equivalent  effective  yield,  if more than one stated
income tax rate is used.

         Quotations of yield, effective yield,  tax-equivalent current yield and
tax-equivalent effective yield provided by the Trust are carried to at least the
nearest hundredth of one percent.  Any fees imposed by Northern,  its affiliates
or  correspondent  banks on their  customers in connection  with  investments in
Service  Shares and Premier  Shares of the  Portfolios  are not reflected in the
calculation of yields for the Portfolios.

         The annualized  yield of each Portfolio  (except  Municipal  Portfolio,
which did not  commence  operations  during the period)  with respect to Service
Shares for the seven-day period ended November 30, 1999 was as follows 3:


<TABLE>
<CAPTION>
<S><C>                        <C>           <C>              <C>                     <C>

                                             Effective        Tax Equivalent          Tax-Equivalent
                               Yield           Yield              Yield               Effective Yield

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio

</TABLE>


<PAGE>



         The information  set forth in the foregoing table reflects  certain fee
reductions  and  expense  limitations.  See  "Additional  Trust  Information  --
Co-Administrators  and Distributor" and "-- Investment  Adviser,  Transfer Agent
and  Custodian." In the absence of such fee reductions and expense  limitations,
the annualized yield of each Portfolio  (except Municipal  Portfolio,  which did
not commence  operations  during the period) with respect to Service  Shares for
the same seven-day period would have been as follows 4:
<TABLE>
<CAPTION>
<S><C>                        <C>           <C>              <C>                     <C>

                                             Effective        Tax Equivalent          Tax-Equivalent
                               Yield           Yield              Yield               Effective Yield

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
</TABLE>


         The annualized  yield of each Portfolio  (except  Municipal  Portfolio,
which did not  commence  operations  during the period)  with respect to Premier
Shares for the seven-day period ended November 30, 1999 was as follows 5:
<TABLE>
<CAPTION>
<S><C>                         <C>           <C>             <C>                     <C>

                                             Effective        Tax Equivalent          Tax-Equivalent
                               Yield           Yield              Yield               Effective Yield

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
</TABLE>




<PAGE>


         The information  set forth in the foregoing table reflects  certain fee
reductions  and  expense  limitations.  See  "Additional  Trust  Information  --
Co-Administrators  and Distributor" and "-- Investment  Adviser,  Transfer Agent
and  Custodian." In the absence of such fee reductions and expense  limitations,
the annualized yield of each Portfolio  (except Municipal  Portfolio,  which did
not commence  operations  during the period) with respect to Premier  Shares for
the same seven-day period would have been as follows 6:

<TABLE>
<CAPTION>
<S><C>                        <C>           <C>              <C>                     <C>

                                             Effective        Tax Equivalent          Tax-Equivalent
                               Yield           Yield              Yield               Effective Yield

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
</TABLE>
- --------
1 An income tax rate of 39% is used in the calculation of tax-equivalent current
yield and tax-equivalent effective yield. 2 An income tax rate of 39% is used in
the calculation of  tax-equivalent  current yield and  tax-equivalent  effective
yield. 3 An income tax rate of 39% is used in the calculation of  tax-equivalent
current yield and tax-equivalent effective yield. 4 An income tax rate of 39% is
used in the  calculation  of  tax-equivalent  current  yield and  tax-equivalent
effective  yield.  5 An  income  tax rate of 39% is used in the  calculation  of
tax-equivalent current yield and tax-equivalent effective yield. 6 An income tax
rate  of 39% is  used  in  the  calculation  tax-equivalent  current  yield  and
tax-equivalent  effective  yield.  7.  Services  may be modified or omitted in a
particular case and items relettered or renumbered.

8. Services may be modified or omitted in a particular case and items relettered
or renumbered.


         The Portfolios' yields may not provide a basis for comparison with bank
deposits and other  investments  which provide a fixed yield for a stated period
of time.  Each  Portfolio's  yields  fluctuate,  unlike  bank  deposits or other
investments  which  pay  a  fixed  yield  for  a  stated  period  of  time.  The
annualization  of one  week's  income is not  necessarily  indicative  of future
actual yields. Actual yields will depend on such variables as portfolio quality,
average portfolio maturity, the type of portfolio instruments acquired,  changes
in money market interest rates, portfolio expenses and other factors. Yields are
one basis  investors  may use to analyze a class of shares of the  Portfolio  as
compared to  comparable  classes of shares of other money market funds and other
investment  vehicles.  However,  yields of comparable classes of shares of other
money market funds and other investment  vehicles may not be comparable  because
of the foregoing variables, and differences in the methods used in valuing their
portfolio instruments, computing net asset value and determining yield.

     Each  Portfolio  may also quote  from time to time the total  return of its
Service Shares or Premier Shares in accordance with SEC regulations.

         The yields and total  returns of Service  Shares and Premier  Shares of
each Portfolio will be calculated  separately  from the yields and total returns
of  Shares,  of each  Portfolio,  which  are not  described  in this  Additional
Statement.

                            AMORTIZED COST VALUATION

         As stated in the  Prospectus,  each  Portfolio  seeks to maintain a net
asset value of $1.00 per share and, in this  connection,  values its instruments
on the basis of amortized  cost  pursuant to Rule 2a-7 under the 1940 Act.  This
method  values a security  at its cost on the date of  purchase  and  thereafter
assumes  a  constant  amortization  to  maturity  of any  discount  or  premium,
regardless of the impact of  fluctuating  interest  rates on the market value of
the instrument. While this method provides certainty in valuation, it may result
in periods  during which value,  as determined  by amortized  cost, is higher or
lower  than the  price a  Portfolio  would  receive  if the  Portfolio  sold the
instrument.  During such  periods the yield to investors  in the  Portfolio  may
differ  somewhat  from that  obtained in a similar  entity which uses  available
indications as to market value to value its portfolio instruments.  For example,
if the use of amortized  cost resulted in a lower (higher)  aggregate  Portfolio
value on a particular day, a prospective investor in the Portfolio would be able
to obtain a somewhat  higher  (lower)  yield and  ownership  interest than would
result from  investment  in such  similar  entity and existing  investors  would
receive less (more) investment income and ownership interest. However, the Trust
expects  that  the  procedures  and  limitations  referred  to in the  following
paragraphs  of this section will tend to minimize  the  differences  referred to
above.

         Under Rule 2a-7,  the Trust's  Board of Trustees,  in  supervising  the
Trust's operations and delegating special  responsibilities  involving portfolio
management to Northern,  has established  procedures  that are intended,  taking
into  account  current  market   conditions  and  the   Portfolios'   investment
objectives,  to stabilize the net asset value of each Portfolio, as computed for
the purposes of purchases  and  redemptions,  at $1.00 per share.  The Trustees'
procedures  include  periodic  monitoring of the  difference  (the "Market Value
Difference")  between the amortized cost value per share and the net asset value
per  share  based  upon  available   indications  of  market  value.   Available
indications  of  market  value  used  by the  Trust  consist  of  actual  market
quotations or appropriate  substitutes  which reflect current market  conditions
and include (a) quotations or estimates of market value for individual portfolio
instruments and/or (b) values for individual portfolio  instruments derived from
market  quotations  relating to varying  maturities  of a class of money  market
instruments.  In the event the  Market  Value  Difference  of a given  Portfolio
exceeds certain limits or Northern believes that the Market Value Difference may
result in material  dilution or other  unfair  results to  investors or existing
shareholders, the Trust will take action in accordance with the 1940 Act and the
Trustees  will take  such  steps as they  consider  appropriate  (e.g.,  selling
portfolio  instruments  to  shorten  average  portfolio  maturity  or to realize
capital gains or losses,  reducing or suspending  shareholder  income  accruals,
redeeming  shares in kind,  or  utilizing a net asset value per share based upon
available  indications of market value which under such circumstances would vary
from $1.00) to  eliminate  or reduce to the extent  reasonably  practicable  any
material dilution or other unfair results to investors or existing  shareholders
which might arise from Market Value Differences.  In particular,  if losses were
sustained by a Portfolio,  the number of outstanding  shares might be reduced in
order to maintain a net asset value per share of $1.00.  Such reduction would be
effected  by  having  each   shareholder   proportionately   contribute  to  the
Portfolio's  capital the  necessary  shares to restore  such net asset value per
share.  Each shareholder  will be deemed to have agreed to such  contribution in
these circumstances by investing in the Portfolio.

         Rule  2a-7  requires  that each  Portfolio  limit  its  investments  to
instruments which Northern determines (pursuant to guidelines established by the
Board of  Trustees)  to present  minimal  credit  risks and which are  "Eligible
Securities" as defined by the SEC and described in the Prospectus. The Rule also
requires  that each  Portfolio  maintain  a  dollar-weighted  average  portfolio
maturity  (not more than 90 days)  appropriate  to its policy of  maintaining  a
stable net asset value per share and  precludes  the purchase of any  instrument
deemed  under the Rule to have a remaining  maturity  of more than 397  calendar
days. Should the disposition of a portfolio security result in a dollar-weighted
average  portfolio  maturity of more than 90 days, the Rule requires a Portfolio
to invest its available  cash in such a manner as to reduce such maturity to the
prescribed limit as soon as reasonably practicable.

                DESCRIPTION OF SERVICE SHARES AND PREMIER SHARES

         The Trust  Agreement  permits the Trust's Board of Trustees to issue an
unlimited number of full and fractional shares of beneficial  interest of one or
more  separate  series   representing   interests  in  one  or  more  investment
portfolios.  The Trustees may hereafter create series in addition to the Trust's
twenty-one existing series,  which represent interests in the Trust's twenty-one
respective portfolios. The Trust Agreement also permits the Board of Trustees to
classify  or  reclassify  any  unissued  shares  into  classes  within a series.
Pursuant to such  authority,  the Trustees  have  authorized  the issuance of an
unlimited  number of shares of beneficial  interest in three separate classes of
shares in each of the  Portfolios:  Shares,  Service Shares and Premier  Shares.
This  Additional  Statement  (and the related  Prospectus)  relates  only to the
Service Shares and Premier Shares of the five Portfolios  discussed herein.  For
information  on the other class of shares in each  Portfolio  and on the Trust's
other investment portfolios, call the toll-free number on page 1.

         Under the terms of the Trust Agreement, each share of each Portfolio is
without par value,  represents an equal proportionate interest in the particular
Portfolio  with  each  other  share of its  class in the same  Portfolio  and is
entitled to such dividends and  distributions out of the income belonging to the
Portfolio as are declared by the Trustees.  Upon any liquidation of a Portfolio,
shareholders  of each class of a Portfolio are entitled to share pro rata in the
net assets  belonging to that class  available for  distribution.  Shares do not
have any preemptive or conversion  rights.  The right of redemption is described
under  "About  Your  Account - Selling  Shares and  Account  Policies  and Other
Information"  in the Prospectus  and under  "Amortized  Cost  Valuation" in this
Additional  Statement.  In addition,  pursuant to the terms of the 1940 Act, the
right of a  shareholder  to redeem shares and the date of payment by a Portfolio
may be  suspended  for more than seven days (a) for any period  during which the
New York  Stock  Exchange  is  closed,  other  than the  customary  weekends  or
holidays, or trading in the markets the Portfolio normally utilizes is closed or
is restricted as determined by the SEC, (b) during any emergency,  as determined
by the SEC,  as a  result  of which  it is not  reasonably  practicable  for the
Portfolio to dispose of instruments owned by it or fairly to determine the value
of its net assets,  or (c) for such other  period as the SEC may by order permit
for the  protection of the  shareholders  of the  Portfolio.  The Trust may also
suspend or  postpone  the  recordation  of the  transfer  of its shares upon the
occurrence  of any of the  foregoing  conditions.  In  addition,  shares of each
Portfolio are redeemable at the  unilateral  option of the Trust if the Trustees
determine in their sole  discretion  that failure to so redeem may have material
adverse  consequences to the shareholders of the Portfolio.  Service and Premier
Shares when issued as described in the Prospectus are validly issued, fully paid
and  nonassessable,  except as stated  below.  In the  interests  of economy and
convenience,  certificates representing Service Shares and Premier Shares of the
Portfolios are not issued.

         The proceeds  received by each  Portfolio for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of that Portfolio. The underlying assets
of each  Portfolio  will be  segregated  on the  books of  account,  and will be
charged with the  liabilities  in respect to that  Portfolio and with a share of
the general  liabilities  of the Trust.  Expenses with respect to the Portfolios
are normally  allocated in proportion  to the net asset value of the  respective
Portfolios  except where  allocations of direct expenses can otherwise be fairly
made.

         Rule 18f-2 under the 1940 Act provides  that any matter  required to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
each  Portfolio  affected  by the matter.  A  Portfolio  is affected by a matter
unless it is clear  that the  interests  of each  Portfolio  in the  matter  are
substantially  identical  or that the matter does not affect any interest of the
Portfolio.  Under the Rule, the approval of an investment  advisory agreement or
any change in a fundamental  investment  policy would be effectively  acted upon
with  respect to a Portfolio  only if approved by a majority of the  outstanding
shares of such Portfolio.  However, the Rule also provides that the ratification
of the  appointment  of  independent  accountants,  the  approval  of  principal
underwriting contracts and the election of Trustees are exempt from the separate
voting  requirements  stated  above.  In addition,  shareholders  of each of the
classes in a particular  investment  portfolio  have equal voting  rights except
that only  shares  of a  particular  class of an  investment  portfolio  will be
entitled  to vote  on  matters  submitted  to a vote of  shareholders  (if  any)
relating to  shareholder  servicing  expenses and transfer  agency fees that are
payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting power of the Trust may elect all of the Trustees irrespective of the vote
of the other shareholders.  Meetings of shareholders of the Trust, or any series
or class thereof,  may be called by the Trustees,  certain  officers or upon the
written request of holders of 10% or more of the shares entitled to vote at such
meeting. The shareholders of the Trust will have voting rights only with respect
to the limited number of matters specified in the Trust Agreement and such other
matters as the Trustees may  determine or may be required by law. The Trust does
not presently intend to hold annual meetings of shareholders  except as required
by the 1940 Act or other  applicable  law. The  Trustees  will  promptly  call a
meeting  of  shareholders  to vote  upon  the  removal  of any  Trustee  when so
requested  in writing by the  record  holders of 10% or more of the  outstanding
shares.  To the extent  required by law,  the Trust will  assist in  shareholder
communications in connection with such a meeting.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment:  (i) that would  adversely  affect the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust or any series or class thereof,  or affecting  assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless  disregard of the duties  involved in the conduct of his or her office.
The Trust  Agreement  provides for  indemnification  of  Trustees,  officers and
agents of the  Trust  unless  the  recipient  is  liable  by  reason of  willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's office.

         The  Trust  Agreement  provides  that  each  shareholder,  by virtue of
becoming such,  will be held to have expressly  assented and agreed to the terms
of the Trust Agreement and to have become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.

         As of December 31, 1999,  substantially all of the Trust's  Portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  Portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less  than 10% of the  Trust's  outstanding  shares.  As of the same  date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding  shares of each class of each  Portfolio.  [Northern has advised the
Trust that no persons beneficially owned five percent or more of the outstanding
Service Shares or Premier Shares of the  Portfolios'  classes as of December 31,
1999.

     Northern has advised the Trust that the following  persons  (whose  mailing
address is: c/o The Northern Trust Company, 50 South LaSalle, Chicago, IL 60675)
beneficially  owned  five  percent  or more  of the  outstanding  shares  of the
Portfolios' classes as of December 31, 1999:
<TABLE>
<CAPTION>
<S><C>                                                                      <C>                     <C>

                                                                                Number               Percentage
                                                                              of Shares              of Shares
DIVERSIFIED ASSETS PORTFOLIO
         Shares
                  TNT-London FB                                              652,242,086.83           10.1%
                  MCCA-Western Asset Management                              338,063,609.18            5.2%
         Service Shares
                  Cole Taylor Bank                                             7,762,828.00           18.3%
                  First Mid-Illinois Bank & Trust                              5,414,728.00           12.8%
                  Merchants National Bank                                     15,275,235.00           36.1%
         Premier Shares
                  Riverview Community Bank                                     6,116,140.00          100.0%

                                                                                Number               Percentage
                                                                              of Shares              of Shares
GOVERNMENT PORTFOLIO
         Service Shares
                  Cole Taylor Bank                                            21,629,429.00           81.4%
                  Secured Trust                                                2,762,285.00           10.4%
         Premier Shares
                  Chitenden Bank                                              46,914,429.00          100.0%

                                                                                Number               Percentage
                                                                              of Shares              of Shares
GOVERNMENT SELECT PORTFOLIO
         Shares
                  TNT-London FBO Food & Agricultural                         168,749,428.00            8.4%
Organization
         Service Shares
                  Richfield Bank & Trust Co.                                   5,294,331.00           45.6%
         Premier Shares
                  Richfield Bank & Trust Co.                                   5,522,453.99           96.1%

                                                                                Number               Percentage
                                                                              of Shares              of Shares
TAX-EXEMPT PORTFOLIO
         Shares
                  Tisch                                                       47,260,209.28            9.3%
         Service Shares
                  Chitenden Bank.                                             27,742,350.00           75.3%
                  Merchants National Bank                                      8,694,855.00           23.6%
         Premier Shares
                  Richfield Bank & Trust Co.                                   5,522,453.99           96.1%

</TABLE>
                     ADDITIONAL INFORMATION CONCERNING TAXES

General

         Each  Portfolio  will  elect  to be  taxed  separately  as a  regulated
investment company (a "RIC"). To qualify as a RIC, each Portfolio generally must
distribute an amount equal to at least the sum of 90% of its investment  company
taxable  income  and 90% of its net  tax-exempt  interest  income  (if any) (net
investment  income  and the  excess  of net  short-term  capital  gain  over net
long-term capital loss), if any, for each year (the "Distribution  Requirement")
and satisfy certain other requirements.

         Each  Portfolio  must  derive  at least 90% of its  gross  income  from
dividends, interest, certain payments with respect to securities loans and gains
from the sale or other disposition of stock or securities or foreign currencies,
or from other  income  derived with respect to its business of investing in such
stock,  securities  or  currencies.  Also , at the close of each  quarter of the
taxable  year,  it is generally  required that at least 50% of the value of each
Portfolio's  assets  must  consist  of cash  and  cash  items,  U.S.  Government
securities,  securities  of other RICs and  securities  of other  issuers (as to
which  the  Portfolio  has not  invested  more than 5% of the value of its total
assets in securities of such issuer and as to which the Portfolio  does not hold
more than 10% of the outstanding voting securities of such issuer),  and no more
than 25% of the value of each  Portfolio's  total  assets may be invested in the
securities  of any  one  issuer  (other  than  U.S.  Government  securities  and
securities  of other  RICs),  or in two or more  issuers  which  such  Portfolio
controls and which are engaged in the same or similar trades or businesses. Each
Portfolio intends to comply with these RIC requirements.

         If for any taxable year any Portfolio were not to qualify as a RIC, all
of its taxable income would be subject to tax at regular corporate rates without
any  deduction  for   distributions   to   shareholders.   In  such  event,  all
distributions  by the  Portfolio  would be taxable to  shareholders  as ordinary
income to the extent of the  Portfolio's  current and  accumulated  earnings and
profits, and would be eligible for the dividends-received  deduction in the case
of corporate shareholders.

         The Internal Revenue Code imposes a nondeductible 4% excise tax on RICs
that fail  currently to distribute an amount equal to specified  percentages  of
their  ordinary  taxable  income and capital gain net income  (excess of capital
gains  over  capital  losses).   Each  Portfolio   intends  to  make  sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar year to avoid  liability for this excise tax. Each
Portfolio also intends to make sufficient  distributions or deemed distributions
each year to avoid  liability for corporate  income tax. If a Portfolio  were to
fail to make sufficient  distributions,  it could be liable for corporate income
tax and for excise tax.

         The Trust will be  required in certain  cases to withhold  and remit to
the U.S.  Treasury 31% of taxable  dividends and gross sale proceeds paid to any
shareholder (i) who has provided either an incorrect tax  identification  number
or no number at all, (ii) who is subject to backup  withholding  by the Internal
Revenue  Service  for  failure to report the  receipt  of  taxable  interest  or
dividend income properly,  or (iii) who has failed to certify to the Trust, when
required to do so, that he or she is not subject to backup  withholding  or that
he or she is an "exempt recipient."


Special Tax  Considerations  Pertaining to the Tax-Exempt and Municipal
Portfolios

         Investors in either of Tax-Exempt and Municipal  Portfolios should note
that  taxpayers  are required to report the receipt of  tax-exempt  interest and
"exempt-interest  dividends" on their Federal income tax returns and that in two
circumstances  such amounts,  while exempt from regular  Federal income tax, are
taxable to persons  subject to  alternative  minimum  taxes.  First,  tax-exempt
interest and  "exempt-interest  dividends" derived from certain private activity
bonds issued  after  August 7, 1986  generally  will  constitute  an item of tax
preference for corporate and noncorporate  taxpayers in determining  alternative
minimum tax  liability.  Second,  all tax-exempt  interest and  "exempt-interest
dividends"  must be taken into  account by corporate  taxpayers  in  determining
certain adjustments for alternative minimum tax purposes.

         As described above and in the Prospectus,  the Tax-Exempt and Municipal
Portfolios are designed to provide investors with Federally  tax-exempt interest
income.

         Neither  the  Tax-Exempt  Portfolio  nor  the  Municipal  Portfolio  is
intended to  constitute  a balanced  investment  program and is not designed for
investors seeking capital appreciation or maximum tax-exempt income irrespective
of fluctuations in principal.  Shares of these  Portfolios would not be suitable
for tax-exempt  institutions or for retirement plans qualified under Section 401
of the Code, H.R.10 plans and individual  retirement accounts because such plans
and  accounts  are  generally  tax-exempt  and,  therefore,  would  not gain any
additional benefit from the Portfolio's dividends being tax-exempt. In addition,
the Portfolios may not be an appropriate investment for persons or entities that
are  "substantial  users" of facilities  financed by private  activity  bonds or
"related  persons"  thereof.  "Substantial  user" is defined under U.S. Treasury
Regulations to include a non-exempt  person which  regularly uses a part of such
facilities  in its trade or  business  and whose  gross  revenues  derived  with
respect to the facilities  financed by the issuance of bonds are more than 5% of
the total revenues  derived by all users of such  facilities,  or which occupies
more than 5% of the usable area of such  facilities or for which such facilities
or a part  thereof were  specifically  constructed,  reconstructed  or acquired.
"Related   persons"   include  certain  related  natural   persons,   affiliated
corporations,  partnerships  and  its  partners  and an S  corporation  and  its
shareholders.

     In  order  for the  Tax-Exempt  and  Municipal  Portfolios  to pay  Federal
exempt-interest dividends with respect to any taxable year, at the close of each
taxable  quarter  at least  50% of the  aggregate  value of the  Portfolio  must
consist of tax-exempt obligations.  An exempt-interest  dividend is any dividend
or part thereof  (other than a capital gain  dividend) paid by the Tax-Exempt or
Municipal Portfolios and designated as an exempt-interest  dividend in a written
notice  mailed to  shareholders  not later  than 60 days  after the close of the
Portfolio's  taxable  year.  However,  the  aggregate  amount  of  dividends  so
designated  by either  Portfolio  cannot  exceed  the  excess  of the  amount of
interest exempt from tax under Section 103 of the Code received by the Portfolio
during the taxable year over any amounts disallowed as deductions under Sections
265 and 171(a)(2) of the Code. The percentage of total dividends paid by each of
the Tax-Exempt and Municipal  Portfolios  with respect to any taxable year which
qualifies  as  Federal  exempt-interest  dividends  will  be the  same  for  all
shareholders receiving dividends from the Portfolio with respect to such year.

         Interest on indebtedness incurred by a shareholder to purchase or carry
shares of the  Tax-Exempt and Municipal  Portfolios  generally is not deductible
for   Federal   income   tax   purposes   to   the   extent    attributable   to
exempt-interest-dividends. If a shareholder holds either Tax-Exempt or Municipal
Portfolio  shares for six months or less,  any loss on the sale or  exchange  of
those shares will be disallowed  to the extent of the amount of  exempt-interest
dividends earned with respect to the shares. The Treasury  Department,  however,
is authorized to issue regulations reducing the six-month holding requirement to
a period of not less than the greater of 31 days or the period  between  regular
distributions for investment companies that regularly distribute at least 90% of
its net tax-exempt interest.  No such regulations had been issued as of the date
of this Additional Statement.

         The Tax-Exempt  and Municipal  Portfolios  will determine  annually the
percentages  of their net  investment  income  which is exempt  from tax,  which
constitute  an item of tax  preference  for purposes of the Federal  alternative
minimum  tax,  and which is fully  taxable,  and will  apply  these  percentages
uniformly to all dividends declared from net investment income during that year.
These percentages may differ  significantly  from the actual percentages for any
particular day.

         Shareholders  will be advised  annually  as to the  Federal  income tax
consequences of distributions made by the Tax-Exempt and Municipal Portfolios.

         Income  from the  Tax-Exempt  Portfolio  may not be  tax-exempt  in its
entirety and may be subject to taxes in certain jurisdictions.

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on  distributions  by a
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
Different tax consequences may apply to a foreign  shareholder engaged in a U.S.
trade or business or present in the U.S. for 183 days or more in a year. Foreign
shareholders  should  consult their tax advisers  regarding the U.S. and foreign
tax consequences of investing in a Portfolio.

Conclusion

         The foregoing  discussion is based on Federal tax laws and  regulations
which  are in  effect on the date of this  Additional  Statement.  Such laws and
regulations may be changed by legislative or  administrative  action. No attempt
is made to present a detailed  explanation of the tax treatment of the Portfolio
or its  shareholders,  and the  discussion  here  and in the  Prospectus  is not
intended as a substitute for careful tax planning.  Shareholders  are advised to
consult their tax advisers with specific  reference to their own tax  situation,
including the application of state and local taxes.

         Although each Portfolio  expects to qualify as a RIC and to be relieved
of all or  substantially  all Federal  taxes,  depending  upon the extent of its
activities  in states and  localities  in which its offices are  maintained,  in
which its  agents  or  independent  contractors  are  located  or in which it is
otherwise deemed to be conducting business, each Portfolio may be subject to the
tax laws of such states or localities.

                                  SERVICE PLAN

         The Trust, on behalf of the Portfolios, has adopted a Service Plan (the
"Plan") with respect to the Service Shares and Premier  Shares.  Under the Plan,
the  Trust,  on behalf of the  Service  Shares  and the  Premier  Shares of each
Portfolio,  is authorized to pay to Northern a monthly or quarterly  service fee
in  respect  of (i)  administrative  support  services  performed  and  expenses
incurred in connection with such  Portfolio's  Service Shares and Premier Shares
and (ii)  personal  and account  maintenance  services  performed  and  expenses
incurred in connection with such Portfolio's  Premier Shares as set forth below.
The fee paid for such services (the "Service Fee") during any one year shall not
exceed:  (i) .33% of the average daily net asset value of the Service  Shares of
such Portfolio and (ii) .58% of the average daily net asset value of the Premier
Shares of such Portfolio  during such period;  provided,  however,  that the fee
paid for personal and account maintenance services and expenses shall not exceed
 .25% of the  average  daily  net  asset  value  of the  Premier  Shares  of such
Portfolio for such period. Northern will determine the amount of the Service Fee
to be paid to one or more brokers,  dealers,  other  financial  institutions  or
other industry professionals (collectively, "Servicing Agents") and the basis on
which such payments will be made.  Payments to a Servicing Agent will be subject
to  compliance  by the  Servicing  Agent  with  the  terms of the  related  Plan
agreement entered into by the Servicing Agent. The Service Fees payable pursuant
to this Plan shall not  pertain to  services  or  expenses  which are  primarily
intended to result in the sales of Service Shares and Premier Shares.

         Payments of the Service Fee with respect to Service  Shares and Premier
Shares will be used to compensate or reimburse Northern and the Servicing Agents
for  administrative  support  services and expenses,  which may include  without
limitation:  (i) acting or arranging for another  party to act, as  recordholder
and  nominee of Service  Shares and Premier  Shares of a Portfolio  beneficially
owned by Customers;  (ii) establishing and maintaining  individual  accounts and
records with respect to Service Shares and Premier  Shares of a Portfolio  owned
by Customers;  (iii) processing and issuing  confirmations  concerning  Customer
orders to purchase,  redeem and exchange  Service Shares and Premier Shares of a
Portfolio; (iv) receiving and transmitting funds representing the purchase price
or redemption proceeds of Service Shares and Premier Shares of a Portfolio;  (v)
processing dividend payments on behalf of Customers; (vi) forwarding shareholder
communications from the Trust (such as proxy statements and proxies, shareholder
reports, annual and semi-annual financial statements and dividend,  distribution
and tax notices);  (vii) providing such statistical and other information as may
be  reasonably  requested by the Trust or necessary for the Trust to comply with
applicable  Federal  or  state  law;  (viii)  facilitating  the  inclusion  of a
Portfolio in investment,  retirement, asset allocation, cash management or sweep
accounts  or similar  programs  or  services  offered to their  Customers  or to
Customers of other Servicing Agents;  (ix)  facilitating  electronic or computer
trading and/or  processing in a Portfolio to their  Customers or to Customers of
other  Servicing  Agents;  and (x) performing  any other similar  administrative
support services. Payments of the Service Fee with respect to the Premier Shares
will also be used to compensate or reimburse  Northern and the Servicing  Agents
for personal and account maintenance  services and expenses,  which may include,
without limitation:  (i) providing facilities to answer inquiries and respond to
correspondence  with  Customers  and other  investors  about the status of their
accounts or about other aspects of the Trust or the applicable  Portfolio;  (ii)
assisting  Customers in completing  application  forms,  selecting  dividend and
other account  options and opening custody  accounts with the Servicing  Agents;
(iii) providing services to Customers  intended to facilitate,  or improve their
understanding of the benefits and risks of, a Portfolio to Customers,  including
asset  allocation  and other similar  services;  (iv) acting as liaison  between
Customers  and the Trust,  including  obtaining  information  from the Trust and
assisting  the  Trust in  correcting  errors  and  resolving  problems;  and (v)
performing any similar personal and account maintenance services.

         Conflict of interest  restrictions  (including the Employee  Retirement
Income  Security  Act of 1974)  may  apply to a  Servicing  Agent's  receipt  of
compensation  paid by the Trust in connection  with the  investment of fiduciary
funds in Service or Premier Shares.  Servicing Agents, including banks regulated
by the  Comptroller  of the Currency,  the Federal  Reserve Board or the Federal
Deposit Insurance Corporation,  and investment advisers and other money managers
subject  to the  jurisdiction  of the  SEC,  the  Department  of  Labor or state
securities  commissions,  are urged to consult legal advisers  before  investing
fiduciary assets in Service or Premier Shares.

         The  Trustees,  including  a  majority  of the  Trustees  who  are  not
interested  persons  of the Trust and who have no direct or  indirect  financial
interest in the operation of such Plan or the related  agreements,  approved the
Plan and  related  agreement  for each  Portfolio  at a meeting  called  for the
purpose of voting on such Plan and related agreement on January 27, 1999 (except
for the Municipal  Portfolio,  which was approved on October 5, 1999).  The Plan
and  related  agreement  will  remain in effect  until  April 30,  2000 and will
continue in effect thereafter only if such continuance is specifically  approved
annually by a vote of the Board of Trustees in the manner described above.

         The Plan may not be amended  to  increase  materially  the amount to be
spent  for the  services  described  therein  without  approval  of the Board of
Trustees in the manner  described  above.  The Plan may be  terminated as to the
Service  Class  and  the  Premier  Class  at  any  time  by a  majority  of  the
non-interested  Trustees.  A service  agreement  may be  terminated at any time,
without  payment  of any  penalty,  by vote of a  majority  of the  Trustees  as
described  above or by any party to the  agreement  on not more than  sixty (60)
days' written notice to any other party to the agreement. Each service agreement
shall  terminate  automatically  if assigned.  While the Plan is in effect,  the
selection and nomination of those Trustees who are not interested  persons shall
be committed to the non-interested  members of the Board of Trustees.  The Board
of  Trustees  has  determined  that,  in its  judgment,  there  is a  reasonable
likelihood  that the Plan will benefit each Portfolio and holders of Service and
Premier Shares of such  Portfolio.  The Plan provides that the Board of Trustees
will review,  at least quarterly,  a written report of the amount expended under
the Plan and the purposes of the expenditures.

                                OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.

         Each  Portfolio is  responsible  for the payment of its expenses.  Such
expenses include, without limitation,  the fees and expenses payable to Northern
and  PFPC,  brokerage  fees  and  commissions,  fees  for  the  registration  or
qualification  of  Portfolio  shares  under  Federal or state  securities  laws,
expenses  of the  organization  of the  Portfolio,  taxes,  interest,  costs  of
liability insurance, fidelity bonds, indemnification or contribution, any costs,
expenses or losses arising out of any liability of or claim for damages or other
relief  asserted  against the Trust for  violation  of any law,  legal,  tax and
auditing  fees and expenses,  Service  Fees,  expenses of preparing and printing
prospectuses, statements of additional information, proxy materials, reports and
notices  and  the  printing  and   distributing  of  the  same  to  the  Trust's
shareholders  and  regulatory  authorities,  compensation  and  expenses  of its
Trustees,  expenses for industry  organizations  such as the Investment  Company
Institute,  miscellaneous  expenses and  extraordinary  expenses incurred by the
Trust.

         The term "majority of the outstanding  shares" of either the Trust or a
particular  Portfolio  means,  with  respect to the  approval  of an  investment
advisory agreement or a change in a fundamental investment restriction, the vote
of the  lesser of (i) 67% or more of the  shares of the Trust or such  Portfolio
present at a meeting,  if the holders of more than 50% of the outstanding shares
of the Trust or such Portfolio are present or represented by proxy, or (ii) more
than 50% of the outstanding shares of the Trust or such Portfolio.

         Statements  contained in the Prospectus or in this Additional Statement
as to the  contents  of any  contract  or other  documents  referred  to are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the registration  statement of
which  the  Prospectus  and this  Additional  Statement  form a part,  each such
statement being qualified in all respects by such reference.

                              FINANCIAL STATEMENTS

         The audited financial  statements and related report of ______________,
independent  auditors,  contained  in  the  annual  report  to  the  Portfolios'
shareholders  for the fiscal year ended November 30, 1999 (the "Annual  Report")
are hereby  incorporated herein by reference and attached hereto. No other parts
of the Annual Report, including without limitation,  "Management's Discussion of
Portfolio  Performance,"  are  incorporated by reference  herein.  Copies of the
Annual  Report  may be  obtained  upon  request  and  without  charge by calling
1-800-637-1380  (toll-free).  No  financial  statements  are  supplied  for  the
Municipal  Portfolio  because it did not commence  operations  during the period
ended November 30, 1999.




<PAGE>



APPENDIX A



Commercial Paper Ratings

         A Standard & Poor's Ratings Group, Inc. ("S&P") commercial paper rating
is a current  assessment of the  likelihood of timely  payment of debt having an
original maturity of no more than 365 days. The following  summarizes the rating
categories  used  by  Standard  and  Poor's  for  commercial  paper  that  is  a
permissible investment for the Portfolios:

         "A-1" - Obligations are rated in the highest  category  indicating that
the  obligor's  capacity to meet its financial  commitment on the  obligation is
strong.  Within this category,  certain  obligations  are designated with a plus
sign (+).  This  indicates  that the  obligor's  capacity to meet its  financial
commitment on these obligations is extremely strong.

         "A-2" -  Obligations  are  somewhat  more  susceptible  to the  adverse
effects of changes in circumstances and economic  conditions than obligations in
higher rating categories.  However, the obligor's capacity to meet its financial
commitment on the obligation is satisfactory.

         Moody's commercial paper ratings are opinions of the ability of issuers
to repay punctually  senior debt obligations not having an original  maturity in
excess of one year, unless explicitly noted. The following summarizes the rating
categories used by Moody's for commercial paper that is a permissible investment
for the Portfolios:

         "Prime-1"  -  Issuers  (or  supporting  institutions)  have a  superior
ability for repayment of senior short-term debt  obligations.  Prime-1 repayment
ability  will  often  be  evidenced  by many of the  following  characteristics:
leading market positions in well-established industries; high rates of return on
funds employed;  conservative capitalization structure with moderate reliance on
debt and ample asset  protection;  broad  margins in earnings  coverage of fixed
financial charges and high internal cash generation; and well-established access
to a range of financial markets and assured sources of alternate liquidity.

         "Prime-2" - Issuers (or supporting  institutions) have a strong ability
for  repayment of senior  short-term  debt  obligations.  This will  normally be
evidenced  by many of the  characteristics  cited above but to a lesser  degree.
Earnings  trends  and  coverage  ratios,  while  sound,  may be more  subject to
variation. Capitalization characteristics,  while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.

     The following summarizes the rating categories used by Duff & Phelps Credit
Rating Co. ("D&P") for commercial paper that is a permissible investment for the
Portfolios:

     "D-1+" - Debt possesses the highest certainty of timely payment. Short-term
liquidity,  including  internal  operating  factors and/or access to alternative
sources  of funds,  is  outstanding,  and safety is just  below  risk-free  U.S.
Treasury short-term obligations.

     "D-1" - Debt  possesses very high  certainty of timely  payment.  Liquidity
factors are excellent and supported by good fundamental protection factors. Risk
factors are minor.

     "D-1-" - Debt possesses high certainty of timely payment. Liquidity factors
are strong and supported by good fundamental  protection  factors.  Risk factors
are very small.

     "D-2" - Debt possesses good certainty of timely payment.  Liquidity factors
and company  fundamentals are sound.  Although ongoing funding needs may enlarge
total  financing  requirements,  access to capital markets is good. Risk factors
are small.

     D&P  employs  three  designations,  "D-1+,"  "D-1" and  "D-1-,"  within the
highest rating category.


     Fitch IBCA ("Fitch") short-term ratings apply to debt obligations that have
time horizons of less than 12 months for most obligations,  or up to three years
for  U.S.  public  finance  securities.  The  following  summarizes  the  rating
categories  used by  Fitch  for  short-term  obligations  that  are  permissible
investments for the Portfolios:

     "F1" - Securities  possess the highest  credit  quality.  This  designation
indicates the strongest capacity for timely payment of financial commitments and
may have an added "+" to denote any exceptionally strong credit feature.

     "F2" - Securities possess good credit quality. This designation indicates a
satisfactory  capacity  for timely  payment of  financial  commitments,  but the
margin of safety is not as great as in the case of the higher ratings.

     Thomson BankWatch, Inc. ("TBW") short-term ratings assess the likelihood of
an untimely  payment of principal and interest of debt instruments with original
maturities of one year or less. The following summarizes the ratings used by TBW
for short-term obligations that are permissible investments for the Portfolios:

     "TBW-1" - This designation  represents TBW's highest category and indicates
a very high  likelihood  that  principal  and interest  will be paid on a timely
basis.

     "TBW-2" - This  designation  represents TBW's  second-highest  category and
indicates  that  while the  degree  of  safety  regarding  timely  repayment  of
principal and interest is strong,  the relative  degree of safety is not as high
as for issues rated "TBW-1."



<PAGE>


Corporate and Municipal Long-Term Debt Ratings


     The  following  summarizes  the  ratings  used by S&P's for  corporate  and
municipal debt that are permissible investments for the Portfolios:

     "AAA" - An  obligation  rated  "AAA" has the  highest  rating  assigned  by
Standard & Poor's.  The obligor's  capacity to meet its financial  commitment on
the obligation is extremely strong.

     "AA" - An obligation rated "AA" differs from the highest rated  obligations
only in small degree. The obligor's capacity to meet its financial commitment on
the obligation is very strong.

     PLUS (+) OR MINUS (-) - The "AA" rating  classification  may be modified by
the addition of a plus or minus sign to show relative  standing within the major
rating categories.

     "r"  -  This  symbol  is  attached  to  the  ratings  of  instruments  with
significant  noncredit  risks. It highlights risks to principal or volatility of
expected returns which are not addressed in the credit rating. Examples include:
obligations  linked  or  indexed  to  equities,   currencies,   or  commodities;
obligations  exposed  to  severe  prepayment  risk - such  as  interest-only  or
principal-only  mortgage  securities;   and  obligations  with  unusually  risky
interest terms, such as inverse floaters.

     The following  summarizes  the ratings used by Moody's  Investors  Service,
Inc. ("Moody's") for corporate and municipal long-term debt that are permissible
investments for the Portfolios:

     "Aaa" - Bonds are judged to be of the best quality. They carry the smallest
degree  of  investment  risk and are  generally  referred  to as  "gilt  edged."
Interest payments are protected by a large or by an exceptionally  stable margin
and  principal is secure.  While the various  protective  elements are likely to
change,  such  changes  as can be  visualized  are most  unlikely  to impair the
fundamentally strong position of such issues.

     "Aa" - Bonds are judged to be of high  quality by all  standards.  Together
with the "Aaa" group they comprise what are generally known as high-grade bonds.
They are rated lower than the best bonds because  margins of protection  may not
be as large as in "Aaa" securities or fluctuation of protective  elements may be
of  greater  amplitude  or there may be other  elements  present  which make the
long-term risk appear somewhat larger than the "Aaa" securities.

     Con.  (---) - Bonds for which the security  depends upon the  completion of
some act or the fulfillment of some condition are rated conditionally. These are
bonds secured by (a) earnings of projects  under  construction,  (b) earnings of
projects  unseasoned  in  operating  experience,  (c)  rentals  which begin when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical  rating denotes probable credit stature upon completion
of construction or elimination of basis of condition.


     Note:  Moody's  applies  numerical  modifiers  1,  2,  and 3 in the  rating
classification  "Aa". The modifier 1 indicates that the obligation  ranks in the
higher end of its generic rating category;  the modifier 2 indicates a mid-range
ranking;  and the modifier 3 indicates a ranking in the lower end of its generic
rating category.


     The  following  summarizes  the  long-term  debt  ratings  used  by D&P for
corporate and municipal long-term debt that are permissible  investments for the
Portfolios:

     "AAA" - Debt is considered to be of the highest  credit  quality.  The risk
factors  are  negligible,  being  only  slightly  more than for  risk-free  U.S.
Treasury debt.

     "AA" - Debt is considered to be of high credit quality.  Protection factors
are strong.  Risk is modest but may vary  slightly  from time to time because of
economic conditions.

     To provide more detailed  indications of credit  quality,  the "AA" and "A"
ratings may be modified by the  addition of a plus (+) or minus (-) sign to show
relative standing within these major categories.

     The  following  summarizes  the  ratings  used by Fitch for  corporate  and
municipal bonds that are permissible investments for the Portfolio:

     "AAA" - Bonds  considered to be investment  grade and of the highest credit
quality.  These  ratings  denote the lowest  expectation  of credit risk and are
assigned only in case of  exceptionally  strong  capacity for timely  payment of
financial commitments. This capacity is highly unlikely to be adversely affected
by foreseeable events.

     "AA" - Bonds  considered  to be  investment  grade and of very high  credit
quality. These ratings denote a very low expectation of credit risk and indicate
very strong capacity for timely payment of financial commitments.  This capacity
is not significantly vulnerable to foreseeable events.

     To provide more detailed  indications of credit  quality,  the Fitch rating
"AA" may be  modified  by the  addition  of a plus (+) or minus (-) sign to show
relative standing within the major rating category.

     TBW  assesses  the  likelihood  of an untimely  repayment  of  principal or
interest over the term to maturity of long term debt and  preferred  stock which
are issued by United  States  commercial  banks,  thrifts  and  non-bank  banks;
non-United States banks; and broker-dealers. The following summarizes the rating
categories  used by TBW for long-term debt ratings for those  investments  which
are permissible  investments for the Portfolios:

     "AAA" - This designation  indicates that the ability to repay principal and
interest on a timely basis is extremely high.

     "AA" - This designation  indicates a very strong ability to repay principal
and interest on a timely basis, with limited incremental risk compared to issues
rated in the highest category.

     PLUS (+) OR MINUS (-) - The  ratings  "AAA" and "AA" may  include a plus or
minus sign designation which indicates where within the respective  category the
issue is placed.

Municipal Note Ratings

     A S&P's rating  reflects  the  liquidity  concerns and market  access risks
unique to notes due in three years or less. The following summarizes the ratings
used by S&P's Ratings Group for municipal notes that are permissible investments
for the Portfolios:

     "SP-1" - The issuers of these  municipal notes exhibit a strong capacity to
pay  principal  and  interest.  Those issues  determined  to possess very strong
characteristics are given a plus (+) designation.

     "SP-2" - The issuers of these municipal notes exhibit satisfactory capacity
to pay principal and interest,  with some vulnerability to adverse financial and
economic changes over the term of the notes.

     Moody's  ratings for state and municipal notes and other  short-term  loans
are  designated  Moody's  Investment  Grade  ("MIG")  and  variable  rate demand
obligations are designated  Variable  Moody's  Investment  Grade ("VMIG").  Such
ratings recognize the differences  between  short-term credit risk and long-term
risk. The following  summarizes the ratings by Moody's for short-term notes that
are permissible  investments for the Portfolios:

     "MIG-1"/"VMIG-1" - This designation denotes best quality.  There is present
strong  protection by  established  cash flows,  superior  liquidity  support or
demonstrated broad-based access to the market for refinancing.

     "MIG-2"/"VMIG-2" - This designation  denotes high quality,  with margins of
protection that are ample although not so large as in the preceding group.

     Fitch and D&P use the short-term  ratings  described under Commercial Paper
Ratings for municipal notes that are permissible investments for the Portfolios.




<PAGE>


PART C.
                                OTHER INFORMATION

ITEM 23.  EXHIBITS

     The   following   exhibits   are   incorporated   herein  by  reference  to
Post-Effective  Amendment No. 31 to Registrant's  Registration Statement on Form
N-1A  (the  "Registration  Statement")  (Accession  No.   0000950130-96-001086),
Post-Effective  Amendment No. 32 to such Registration  Statement  (Accession No.
0000950130-97-000170),  Post-Effective  Amendment  No.  33 to such  Registration
Statement (Accession No. 0000950130-97-001306),  Post-Effective Amendment No. 34
to   such   Registration   Statement   (Accession   No.   0000950130-97-002471),
Post-Effective  Amendment No. 35 to such Registration  Statement  (Accession No.
0000950131-97-005862),  Post-Effective  Amendment  No.  36 to such  Registration
Statement (Accession No.  0000950131-98-00216),  Post-Effective Amendment No. 37
to   such   Registration   Statement   (Accession   No.    0000950131-98-00512),
Post-Effective  Amendment No. 38 to such Registration  Statement  (Accession No.
0000950131-98-002030),  Post-Effective  Amendment  No.  39 to such  Registration
Statement (Accession No. 00009150131-99-000461), Post-Effective Amendment No. 40
to  such  Registration  Statement  (Accession  No.   0000927405-99-000282)   and
Post-Effective  Amendment No. 41 to such Registration  Statement  (Accession No.
0000927405-99-000333) :

     (a) (1) Agreement and  Declaration  of Trust dated July 1, 1997  (Accession
No. 0000950131-98-00216).

     (2) Amendment No. 1 dated January 27, 1998 to the Agreement and Declaration
of Trust (Accession No. 0000950131-99-000461).

     (3) Amendment No. 2 dated May 15, 1998 to the Agreement and  Declaration of
Trust (Accession No. 0000950131-99-000461).

     (4) Amendment No. 3 dated October 5, 1999 to the Agreement and  Declaration
of Trust  (Accession  No.  0000927405-99-000333).

     (5) Amendment No. 4 dated January 24, 2000 to the Agreement and Declaration
of Trust is filed herewith.


     (b) By-Laws dated July 8, 1997 (Accession No. 0000950131-98-00216).

     (c) Articles IV, V and VII of the Agreement and  Declaration of Trust dated
July 1, 1997 (Accession No. 0000950131-98-00216).

     (d) (1)  Investment  Advisory  Agreement  dated March 31, 1998  between the
Registrant and The Northern Trust Company (the "Investment  Advisory Agreement")
(Accession No. 0000950131-99-000461).

     (2)  Addendum  No.  1  dated  March  31,  1998 to the  Investment  Advisory
Agreement (Accession No. 0000950131-99-000461).

     (3)  Addendum  No.  2  dated  March  31,  1998 to the  Investment  Advisory
Agreement (Accession No. 0000950131-99-000461).

     (4)  Addendum  No.  3  dated  March  31,  1998 to the  Investment  Advisory
Agreement (Accession No. 0000950131-99-000461).

     (5)  Addendum  No.  4  dated  March  31,  1998 to the  Investment  Advisory
Agreement (Accession No. 0000950131-99-000461).

     (6)  Addendum  No.  5  dated  March  31,  1998 to the  Investment  Advisory
Agreement (Accession No. 0000950131-99-000461).

     (7)  Addendum  No.  6  dated  March  31,  1998 to the  Investment  Advisory
Agreement (Accession No. 0000950131-99-000461).

     (8)  Assumption  Agreement  dated April 1, 1998 between The Northern  Trust
Company  and  Northern  Trust  Quantitative   Advisors,   Inc.   (Accession  No.
0000950131-99-000461).

     (9) Form of Addendum No. 7 to Investment Advisory Agreement  (Accession No.
0000927405-99-000333).

(e)

     (1)  Distribution  Agreement  between the  Registrant  and  Northern  Funds
Distributors, LLC is filed herewith.

(f) Not Applicable.

     (g) (1) Custodian  Agreement  dated June 8, 1992 between the Registrant and
The Northern Trust Company (Accession No. 0000950131-98-002030).

     (2) Addendum No. 1 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950130-96-001086).

     (3) Addendum No. 2 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950130-96-001086).

     (4) Addendum No. 3 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950130-97-002471).

     (5) Addendum No. 4 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950131-97-005862).

     (6) Addendum No. 5 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950131-98-002030).

     (7) Addendum No. 6 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950131-98-002030).

     (8) Addendum No. 7 to the Custodian  Agreement  between the  Registrant and
The Northern Trust Company (Accession No. 0000950131-99-000461).

     (9) Foreign Custody Agreement between the Registrant and The Northern Trust
Company (Accession No. 0000950131-98-002030).

     (10) Addendum No. 1 to the Foreign Custody Agreement between the Registrant
and The Northern Trust Company (Accession No. 0000950130-97-002471).

     (11) Addendum No. 2 to the Foreign Custody Agreement between the Registrant
and The Northern Trust Company (Accession No. 0000950131-98-002030).

     (12) Addendum No. 3 to the Foreign Custody Agreement between the Registrant
and The Northern Trust Company (Accession No. 0000950131-99-000461).

     (13) Foreign Custody Monitoring  Agreement dated March 31, 1998 between the
Registrant and The Northern Trust Company (Accession No. 0000950131-99-000461).

     (14)  Form  of  Addendum  No.  8  to  Custodian  Agreement  (Accession  No.
0000927405-99-000333).

     (h) (1) Agreement and Plan of Reorganization between the Registrant and The
Benchmark Tax-Exempt Fund (Accession No. 0000950131-98-002030).

     (2) Revised and Restated  Transfer  Agency  Agreement dated January 8, 1993
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950131-98-002030).

     (3) Addendum No. 1 to the Revised and Restated  Transfer  Agency  Agreement
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950130-96-001086).

     (4) Addendum No. 2 to the Revised and Restated  Transfer  Agency  Agreement
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950130-96-001086).

     (5) Addendum No. 3 to the Revised and Restated  Transfer  Agency  Agreement
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950130-97-002471).

     (6) Addendum No. 4 to the Revised and Restated  Transfer  Agency  Agreement
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950131-97-005862).

     (7) Addendum No. 5 to the Revised and Restated  Transfer  Agency  Agreement
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950131-98-002030).

     (8) Addendum No. 6 to the Revised and Restated  Transfer  Agency  Agreement
between  the  Registrant   and  The  Northern   Trust  Company   (Accession  No.
0000950131-99-000461).

     (9)  Shareholder  Servicing Plan for Class C and D Shares and Related Forms
of  Servicing  Agreement is filed  herewith.

     (10) Service Plan for the Service and Premier Classes of Shares and Related
Forms of Servicing Agreement is filed herewith.

     (11) Amended and Restated Co-Administration Agreement dated October 5, 1999
among the  Registrant,  Northern Trust Company and First Data Investor  Services
Group, Inc. (now known as PFPC Inc.) is filed herewith.

     (12)  Form of  Addendum  No. 7 to  Revised  and  Restated  Transfer  Agency
Agreement (Accession No. 0000927405-99-000333).


     (i)   Opinion   of   Drinker    Biddle   &   Reath   LLP   (Accession   No.
0000927405-99-000333).


     (j)(1) Consent of Drinker Biddle & Reath LLP is filed herewith.

     (2) Consent of Independent Auditors to be filed by subsequent amendment.


     (k) None.

     (l) (1)  Subscription  Agreement with Goldman,  Sachs & Co.  (Accession No.
0000950131-98-002030).

     (2) Amendment No. 1 to  Subscription  Agreement  with Goldman,  Sachs & Co.
(Accession No. 0000950131-98-002030).

     (3) Amendment No. 2 to  Subscription  Agreement  with Goldman,  Sachs & Co.
(Accession No. 0000950131-98-002030).

     (4) Amendment No. 3 to  Subscription  Agreement  with Goldman,  Sachs & Co.
(Accession No. 0000950131-98-002030).

     (m) None.

     (n) Amended and  Restated  Plan  pursuant to Rule 18f-3 for  Operation of a
Multi-Class System (Accession No. 0000927405-99-000333).


ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

Registrant is controlled by its Board of Trustees.

ITEM 25. INDEMNIFICATION

     Section 3 of Article IV of the  Registrant's  Agreement and  Declaration of
Trust provides for  indemnification  of the  Registrant's  Trustees and officers
under certain  circumstances.  A copy of such Agreement and Declaration of Trust
was  filed as  Exhibit 1 to  Post-Effective  Amendment  No.  36 to  Registrant's
Registration Statement on Form N-1A.

     Paragraph 7 of the Investment Advisory Agreement between the Registrant and
The Northern Trust Company  provides for  indemnification  of The Northern Trust
Company or, in lieu  thereof,  contribution  by the  Registrant,  under  certain
circumstances.  A copy of the Investment Advisory Agreement was filed as Exhibit
(d)(1) to Post-Effective Amendment No. 39 to Registrant's Registration Statement
on Form N-1A.

     Article 10 of the Amended and Restated  Co-Administration  Agreement  dated
October 5, 1999 among the  Registrant,  Northern  Trust  Company  and First Data
Investor  Services  Group,  Inc.  (now  known as PFPC  Inc.)  provides  that the
Registrant  will  indemnify  Northern  Trust  Company  and First  Data  Investor
Services  Group,  Inc.  (now  known as PFPC  Inc.)  (each a  "Co-Administrator")
against all claims  except those  resulting  from the willful  misfeasance,  bad
faith or negligence of such Co-Administrator,  or the Co-Administrator's  breach
of  confidentiality.  A  copy  of the  Amended  and  Restated  Co-Administration
Agreement is filed herewith.


     Paragraph 3 of the  Distribution  Agreement  dated December 1, 1999 between
the Registrant and Northern Funds  Distributors,  LLC ("NFD")  provides that the
Registrant  will indemnify NFD against  certain  liabilities  relating to untrue
statements  or  omissions  of material  fact  except  those  resulting  from the
reliance on information  furnished to the Registrant by NFD, or those  resulting
from the willful misfeasance, bad faith or negligence of NFD, or NFD's breach of
confidentiality. A copy of the Distribution Agreement is filed herewith.


     A mutual  fund  trustee  and  officer  liability  policy  purchased  by the
Registrant insures the Registrant and its Trustees and officers,  subject to the
policy's  coverage limits and exclusions and varying  deductibles,  against loss
resulting  from  claims  by reason of any act,  error,  omission,  misstatement,
misleading statement, neglect or breach of duty.


ITEM 26.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

     The Northern Trust Company, the Registrant's  investment adviser, is a full
service  commercial  bank and also  provides a full range of trust and fiduciary
services. Set forth below is a list of all of the directors, senior officers and
those officers  primarily  responsible for Registrant's  affairs of The Northern
Trust  Company  and,  with  respect to each such  person,  the name and business
address of the company (if any) with which such person has been connected at any
time since  November 30, 1997,  as well as the capacity in which such person was
connected.

     Northern  Trust  Quantitative  Advisors,   Inc.  ("NTQA")  is  an  indirect
wholly-owned subsidiary of Northern Trust Corporation. The list required by this
Item 26 of officers and directors of NTQA,  together with  information as to any
other  business,  profession,  vocation or employment  of a  substantial  nature
engaged  in by such  officers  and  directors  during  the  past two  years,  is
incorporated  by  reference  to  Schedules  A and D of Form  ADV,  filed by NTQA
pursuant to the Investment Advisers Act of 1940 (SEC File No. 801-333580).

<TABLE>
<CAPTION>
<S><C>                             <C>                                         <C>

NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

Duane L. Burnham                   Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Abbott Laboratories                         Retired Chairman,
                                   150 Field Drive, Suite 160                  Chief  Executive  Officer  and Former
                                   Lake Forest, IL                             Director

                                   Sara Lee Corporation                        Director
                                   3 First National Plaza
                                   Chicago, IL  60602

Dr. Dolores E. Cross               Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Chicago State University                    Former President
                                   95th Street at King Drive
                                   Chicago, IL  60643

                                   General Electric Company                    Former President
                                   3135 Easton Turnpike                        GE Fund
                                   Fairfield, CT  06432

                                   The Graduate School and University Center   Former President of Leadership
                                   The City University of NY                   and Diversity
                                   33 W. 42nd Street - Room 1400N
                                   New York, NY  10036

                                   Morris Brown College                        President (6/99)
                                   Administration Building, 2nd Floor
                                   643 Martin Luther King Jr. Drive
                                   Atlanta, GA  30314


<PAGE>



NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

Susan Crown                        Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Henry Crown and Company                     Vice President
                                   222 N. LaSalle Street, Suite 2000
                                   Chicago, IL  60601

                                   Baxter International, Inc.                  Director
                                   One Baxter Parkway
                                   Deerfield, IL  60015

                                   Illinois Tool Works Inc.                    Director
                                   3600 W. Lake Avenue
                                   Glenview, IL  60025

John R. Goodwin                    NTQA                                        Director, Managing Director
Senior Vice President              50 S. LaSalle Street                        and Chief Investment Officer
                                   Chicago, IL  60675

Robert S. Hamada                   Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   The University of Chicago                   Dean and Edward Eagle Brown
                                   Graduate School of Business                 Distinguished  Service  Professor  of
                                   1101 East 58th Street                       Finance
                                   Chicago, IL  60637

                                   A.M. Castle & Co.                           Director
                                   3400 North Wolf Road
                                   Franklin, IL  60131

                                   Chicago Board of Trade                      Director
                                   141 West Jackson Boulevard
                                   Chicago, IL  60674

Barry G. Hastings                  Northern Trust Corporation                  President,
President,                         50 S. LaSalle Street                        Chief Operating Officer and Director
Chief   Operating   Officer   and  Chicago, IL  60675
Director
                                   Northern Trust of California Corporation    Director
                                   355 S. Grand Avenue
                                   Los Angeles, CA  90017

                                   Northern Trust of Florida Corporation       Vice Chairman of the Board
                                   700 Brickell Avenue                         and Director
                                   Miami, FL  33131

                                   Nortrust Realty Mgmt., Inc.                 Director
                                   50 S. LaSalle Street, 38th Floor
                                   Chicago, IL  60675



<PAGE>



NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

Robert A. Helman                   Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Mayer, Brown & Platt                        Partner
                                   190 S. LaSalle Street, 38th Floor
                                   Chicago, IL  60603

                                   Chicago Stock Exchange                      Governor
                                   One Financial Plaza
                                   440 S. LaSalle Street
                                   Chicago, IL  60605

                                   Dreyer's Grand Ice Cream, Inc.              Director
                                   5929 College Avenue
                                   Oakland, CA  94618

                                   TC PipeLines GP, Inc.                       Director
                                   Four Greenspoint Plaza
                                   16945 Northchase Drive
                                   Houston, TX  77060

                                   Brambles USA, Inc.                          Director
                                   400 N. Michigan Avenue
                                   Chicago, IL  60611

                                   Zenith Electronics                          Director
                                   1000 Milwaukee Avenue
                                   Glenview, IL  60025

Arthur L. Kelly                    Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   KEL Enterprises L.P.                        Managing Partner
                                   Two First National Plaza
                                   20 S. Clark Street, Suite 2222
                                   Chicago, IL  60603

                                   Bayerische Motoren                          Director
                                   Werke (BMW) A.G. BMW Haus
                                   Petuelring 130
                                   Postfach 40 02 40
                                   D-8000
                                   Munich 40 Germany

                                   A.G. Deere & Company                        Director
                                   John Deere Road
                                   Moline, IL  61265

                                   Nalco Chemical Company                      Former Director
                                   One Nalco Center
                                   Naperville, IL  60563-1198

                                   Snap-on Incorporated                        Director
                                   2801 80th Street
                                   Kenosha, WI  53140



<PAGE>





NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

                                   Tejas Gas Corporation                       Former Director
                                   1301 McKinney Street
                                   Houston, TX  77010

                                   Thyssen-Krupp Industries AG                 Director
                                   Am Thyssenhaus 1
                                   45128 Essen Germany

Frederick A. Krehbiel              Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   DeVry, Inc.                                 Director
                                   One Tower Lane
                                   Suite 1000
                                   Oak Brook Terrace, IL  60181

                                   Molex Incorporated                          Co-Chairman, Co-CEO
                                   2222 Wellington Court                       and Director
                                   Lisle, IL  60532-1682

                                   Nalco Chemical Company                      Former Director
                                   One Nalco Center
                                   Naperville, IL  60563-1198

                                   Tellabs, Inc.                               Director
                                   4951 Indiana Avenue
                                   Lisle, IL  60532

Robert A. LaFleur                  None
Senior Vice President


James J. Mitchell, III             The Northern Trust Company of New York      Director
President - Worldwide  Operations  40 Broad Street, 8th Floor
and   Technology   and  Executive  New York, NY  10004
Vice President

William G. Mitchell                Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Peoples Energy Corporation                  Director
                                   122 South Michigan Avenue
                                   Chicago, IL  60603

                                   The Sherwin-Williams Company                Director
                                   101 Prospect Avenue, N.W.
                                   Cleveland, OH  44115-1075

Edward J. Mooney                   Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Nalco Chemical Company                      Chairman, Chief Executive Officer,
                                   One Nalco Center                            President and Director
                                   Naperville, IL  60563-1198

                                   Morton International, Inc.                  Former Director
                                   100 North Riverside Plaza
                                   Chicago, IL  60605

                                   FMC Corporation                             Director
                                   200 E. Randolph Drive
                                   Chicago, IL  60601


<PAGE>



NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

William A. Osborn                  Northern Trust Corporation                  Director
Chairman and                       50 S. LaSalle Street
Chief Executive Officer            Chicago, IL  60675

                                   Nortrust Realty Management Inc.             Director
                                   50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Northern Futures Corporation                Director
                                   50 S. LaSalle Street
                                   Chicago, IL  60675

Sheila A. Penrose                  Northern Trust Global Advisors, Inc.        Director
President -                        29 Federal Street
Corporate    and    Institutional  Stamford, CT  06901
Services and Executive
Vice President
                                   Nalco Chemical Company                      Director
                                   One Nalco Center
                                   Naperville, IL  60563-1198

                                   Northern Trust Retirement Consulting, LLC   Manager
                                   400 Perimeter Center Terrace, Suite 850
                                   Atlanta, GA  30346

                                   NTQA                                        Director
                                   50 S. LaSalle Street
                                   Chicago, IL  60675

Perry R. Pero                      Northern Futures Corporation                Director
Senior Executive Vice President    50 S. LaSalle Street
and Chief Financial Officer        Chicago, IL  60675

                                   Northern Investment Corporation             Former   Chairman,    President   and
                                   50 S. LaSalle Street                        Director,
                                   Chicago, IL  60675                          Former Treasurer

                                   Northern Trust Global Advisors, Inc.        Director
                                   29 Federal Street
                                   Stamford, CT  06901

                                   Northern Trust Securities, Inc.             Director
                                   50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Nortrust Realty Management, Inc.            Director
                                   50 S. LaSalle Street
                                   Chicago, IL  60675

                                   NTQA                                        Director
                                   50 S. LaSalle Street
                                   Chicago, IL  60675

Stephen N. Potter                  NTQA                                        Director and Managing Director
Vice President                     50 S. LaSalle Street
                                   Chicago, IL  60675

Peter L. Rossiter                  None
Executive Vice President
and General Counsel



<PAGE>



NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

Harold B. Smith                    Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   Illinois Tool Works Inc.                    Chairman of the Executive Committee
                                   3600 West Lake Avenue
                                   Glenview, IL  60025-5811

                                   W.W. Grainger, Inc.                         Director
                                   5500 West Howard Street
                                   Skokie, IL  60077

                                   Northwestern Mutual Life Insurance Co.      Trustee
                                   720 East Wisconsin Avenue
                                   Milwaukee, WI  53202

William D. Smithburg               Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   The Quaker Oats Company                     Retired Chairman,
                                   321 North Clark Street                      President and Chief Executive Officer
                                   Chicago, IL  60610

                                   Abbott Laboratories                         Director
                                   One Abbott Park Road
                                   Abbott Park, IL  60675

                                   Corning Incorporated                        Director
                                   Corning, NY  14831

                                   Prime Capital Corporation                   Director
                                   10275 W. Higgins Road, Suite 200
                                   Rosemont, IL  60018

James M. Snyder                    NTQA                                        Chairman,
Executive Vice President           50 S. LaSalle Street                        Chief Executive Officer and Director
                                   Chicago, IL  60675

                                   Northern Trust Global Advisors, Inc.        Director
                                   29 Federal Street
                                   Stamford, CT  06901

Bide L. Thomas                     Northern Trust Corporation                  Director
Director                           50 S. LaSalle Street
                                   Chicago, IL  60675

                                   MYR Group Inc.                              Director
                                   (formerly L.E. Myers Company)
                                   2550 W. Golf Road
                                   Rolling Meadows, IL  60008

                                   R.R. Donnelley & Sons Company               Director
                                   77 West Wacker Drive
                                   Chicago, IL  60601



<PAGE>



NAME AND POSITION                  NAME AND PRINCIPAL BUSINESS                 CONNECTION WITH
WITH INVESTMENT ADVISER            ADDRESS OF OTHER COMPANY                    OTHER COMPANY

Stephen B. Timbers                 Northern Trust Global Advisors, Inc.        Director
President - NTGI                   29 Federal Street
and Executive Vice President       Stamford, CT  06901

                                   LTV Steel Co.                               Director
                                   200 Public Square
                                   Cleveland, OH  44114-2308

                                   Zurich-Kemper Investments                   Former President and
                                   222 S. Riverside Plaza                      Chief Executive Officer
                                   Chicago, IL  60606

Jeffrey H. Wessel                  NTQA                                        President and Director
Executive Vice President           50 S. LaSalle Street
                                   Chicago, IL  60675
</TABLE>

ITEM 27.  PRINCIPAL UNDERWRITERS

         (a)      Northern Funds Distributors, LLC (the "Distributor"),  acts as
                  distributor  for Northern  Institutional  Funds  pursuant to a
                  distribution agreement dated December 1, 1999. The Distributor
                  also acts as underwriter for Northern Funds.

         (b)      The  information  required by this Item 27(b) with  respect to
                  each   director,   officer,   or  partner  of  Northern  Funds
                  Distributors,  LLC is  incorporated by reference to Schedule A
                  of Form BD filed by Northern Funds Distributors,  LLC with the
                  Securities and Exchange  Commission pursuant to the Securities
                  Act of 1934 (File No. 8-51242).

         (c)      Not Applicable.



<PAGE>


ITEM 28.  LOCATION OF ACCOUNTS AND RECORDS

The  Agreement  and  Declaration  of  Trust,  By-laws  and  minute  books of the
Registrant  are in the physical  possession  of PFPC Inc.  (formerly  First Data
Investor Services Group, Inc.), 101 Federal Street, Boston, Massachusetts 02110.
Records for Northern Funds Distributors,  LLC, the distributor,  are located
at Four Falls  Corporate  Center,  6th Floor,  West  Conshohocken,  Pennsylvania
19428-2961.  All  other  accounts,  books  and other  documents  required  to be
maintained  under  Section 31(a) of the  Investment  Company Act of 1940 and the
Rules  promulgated  thereunder  are in the physical  possession  of The Northern
Trust Company, 50 S. LaSalle Street, Chicago, Illinois 60675 and NTQA, 50 S.
LaSalle Street, Chicago Illinois 60690.

ITEM 29.  MANAGEMENT SERVICES

Not Applicable.

ITEM 30.  UNDERTAKINGS

Not Applicable.



<PAGE>

                          NORTHERN INSTITUTIONAL FUNDS


                                Power of Attorney



         KNOW ALL  PERSONS  BY THESE  PRESENTS,  that the  undersigned,  being a
Trustee of Northern  Institutional  Funds, a business trust  organized under the
laws of The State of Delaware (the  "Trust"),  does hereby make,  constitute and
appoint Richard Rose, Brian Curran,  Linda Hoard and Teresa Hamlin,  and each of
them,  attorneys-in-fact  and  agents of the  undersigned  with  full  power and
authority of substitution  and  resubstitution,  in any and all  capacities,  to
execute for and on behalf of the  undersigned any and all filings and amendments
to the  Registration  Statement on Form N-1A relating to the shares of the Trust
and any other documents and instruments  incidental thereto,  and to deliver and
file the same, with all exhibits  thereto,  and all documents and instruments in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and  perform  each and every act and thing  that said  attorneys-in-fact  and
agents,  and each of them,  deem  advisable  or necessary to enable the Trust to
effectuate the intents and purposes  hereof,  and the  undersigned  hereby fully
ratifies  and  confirms all that said  attorneys-in-fact  and agents,  or any of
them, or their or his or her substitute or substitutes,  shall do or cause to be
done by virtue hereof.

         IN WITNESS  WHEREOF,  the undersigned has subscribed his name this 21st
day of April, 1999.
<TABLE>
<CAPTION>
<S>                                                      <C>

                                                          /s/ Edward J. Condon, Jr.
                                                          Edward J. Condon, Jr.

                                                          /s/ Richard Gordon Cline
                                                          Richard Gordon Cline

                                                          /s/ John W. English
                                                          John W. English

                                                          /s/ Sandra Polk Guthman
                                                          Sandra Polk Guthman

                                                          /s/ Frederick T. Kelsey
                                                          Frederick T. Kelsey

                                                          /s/ William H. Springer
                                                          William H. Springer

                                                          /s/ Richard P. Strubel
                                                          Richard P. Strubel

</TABLE>


<PAGE>


                                                     EXHIBIT INDEX
<TABLE>
<CAPTION>
<S><C>                    <C>


Exhibit No.                Description

(a)(5)                     Amendment No. 4 dated January 24, 2000 to the Agreement and
                           Declaration of Trust

(e)(1)                     Distribution Agreement between the Registrant and Northern Funds
                           Distributors, LLC

(j)(1)                     Consent of Drinker Biddle & Reath LLP

(9)                         Shareholder Servicing Plan for Class C and D Shares and Related Forms
                           of Servicing Agreement

(10)                        Service Plan for the Service and Premier Classes of Shares and Related
                           Forms of Servicing Agreement

(11)                        Amended and Restated Co-Administration Agreement dated October 5,
                           1999 among the Registrant, Northern Trust Company and First Data
                           Investor Services Group, Inc. (now known as PFPC Inc.)

</TABLE>



<PAGE>


                                   SIGNATURES

Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company Act of 1940, the Registrant has duly caused this registration  statement
to be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Boston and  Commonwealth  of  Massachusetts  on the 28th day of January,
2000.

NORTHERN INSTITUTIONAL FUNDS

By:        /s/Linda J. Hoard
           Linda J. Hoard
           Secretary

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
registration  statement  has been signed below by the  following  persons in the
capacities and on the date indicated.
<TABLE>
<CAPTION>
<S><C>                                      <C>                            <C>

           Name                              Title                         Date

/s/Jylanne Dunne                             President                     January 28, 2000
Jylanne Dunne

/s/Brian R. Curran                           Treasurer                     January 28, 2000
Brian R. Curran

WILLIAM H. SPRINGER*                          Trustee                      January 28, 2000
William H. Springer

RICHARD G. CLINE*                             Trustee                      January 28, 2000
Richard G. Cline

EDWARD J. CONDON*                             Trustee                      January 28, 2000
Edward J. Condon

JOHN W. ENGLISH*                              Trustee                      January 28, 2000
John W. English

SANDRA P. GUTHMAN*                            Trustee                      January 28, 2000
Sandra P. Guthman

RICHARD P. STRUBEL *                          Trustee                      January 28, 2000
Richard P. Strubel

*By: /s/Linda J. Hoard                                                     January 28, 2000
       Linda J. Hoard
       Attorney-in-fact
</TABLE>


<PAGE>




                                                              Exhibit a(5)

                          NORTHERN INSTITUTIONAL FUNDS
                           (a Delaware business trust)


            AMENDMENT NO. 4 TO THE AGREEMENT AND DECLARATION OF TRUST

         The undersigned  hereby  certifies that the following  resolutions were
duly  adopted by the Board of  Trustees  of  Northern  Institutional  Funds (the
"Trust") on January 24, 2000:

         RESOLVED,  that the Agreement and  Declaration of Trust of the Trust be
amended  to change  the  designation  and name of the A, C and D Classes  of the
"MarketPower  Portfolio"  to  the  A,  C and D  Classes  of  the  "MarketCommand
Portfolio";

         FURTHER  RESOLVED,  that the  officers of the Trust be, and each hereby
is,  authorized  and  empowered  to execute and  deliver any and all  documents,
instruments,  papers and writings, including, but not limited to, any instrument
to be filed with the Secretary of State of the State of Delaware,  and to do any
and all other acts,  in the name of the Trust and on its  behalf,  as he, she or
they may deem necessary or desirable in connection with or in furtherance of the
foregoing resolution.


Date: January 24, 2000                                       /s/Linda J. Hoard
                                                                Linda J. Hoard
                                                                Secretary



                                                                Exhibit 3(1)

                             DISTRIBUTION AGREEMENT

         THIS  AGREEMENT  is made as of this  1st  day of  December,  1999  (the
"Agreement")  by and  between  Northern  Institutional  Funds  (the  "Fund"),  a
Massachusetts business trust, and Northern Funds Distributors,  LLC, a Wisconsin
limited liability company.

         WHEREAS,  the Fund is registered as an open-end  management  investment
company under the Investment  Company Act of 1940, as amended (the "1940 Act"'),
and  is  currently  offering  shares  of  beneficial  interest  (the  "Shares"),
representing  interests  in  investment  portfolios  of the Fund  identified  on
Schedule A hereto (the  "Portfolios")  which are registered  with the Securities
and  Exchange  Commission  (the  "SEC")  pursuant  to  the  Fund's  Registration
Statement on Form N-1A (the "Registration Statement"); and

         WHEREAS,  the Fund desires to retain the Distributor as distributor for
the  Portfolios  to provide for the sale and  distribution  of the Shares of the
Portfolios identified on Schedule A and for such additional classes or series as
the Fund may issue,  and the  Distributor  is prepared to provide such  services
commencing on the date first written above.

         NOW THEREFORE,  in  consideration  of the premises and mutual covenants
set forth  herein and  intending to be legally  bound hereby the parties  hereto
agree as follows:

1. Service as Distributor

     1.1 The Fund hereby  appoints the  Distributor as exclusive  distributor of
the  Shares  covered  by the  Registration  Statement  then in effect  under the
Securities  Act of 1933,  as amended (the "1933 Act"),  on the terms and for the
periods  set  forth in this  Agreement.  The  Distributor  hereby  accepts  such
appointment  and agrees to render the  services and perform the duties set forth
in this Agreement without  compensation.  The Distributor will have no liability
for payment for the purchase of Shares by  unaffiliated  investors sold pursuant
to this Agreement or with respect to redemptions or repurchases of Shares.

     1.2 The  Distributor  agrees to sell Shares of each of the  Portfolios,  as
agent,  from time to time during the term of this  Agreement at the Shares' then
current net asset value (with any purchase price  adjustments,  as  applicable).
The net asset value of the Shares shall be determined in the manner  provided in
the then current prospectus and statement of additional  information relating to
the  Shares  (collectively,   the  "Prospectus"  and  "Statement  of  Additional
Information"),  and when determined  shall be applicable to all  transactions as
provided  in the  Prospectus.  The  net  asset  value  of the  Shares  shall  be
calculated  by the  Fund  or by  another  entity  on  behalf  of the  Fund.  The
Distributor  shall have no duty to inquire into, or liability  for, the accuracy
of the net asset value per Share as calculated.

     1.3 The Distributor agrees to use appropriate efforts to solicit orders for
the sale of the Shares.  The  Distributor  shall,  at its own  expense,  finance
appropriate  activities  which are  primarily  intended to result in the sale of
Shares,  including,  but not limited to, the distribution  services set forth in
Schedule B to this Agreement. It is contemplated that the Distributor will enter
into selling  agreements with securities  dealers,  financial  institutions  and
other  industry  professionals,  such as investment  advisers,  accountants  and
estate  planning  firms to the extent  permitted by SEC and NASD  regulations or
other  governing law, with respect to the offering of Shares to the public.  The
Distributor  will  require each dealer with whom the  Distributor  has a selling
agreement to conform to the applicable provisions of the Registration Statement,
with respect to the public  offering  price of the Shares,  and the  Distributor
shall not cause the Fund to withhold  the  placing of  purchase  orders so as to
make a profit thereby.

    1.4 The Fund  understands that the Distributor is now, and may in the future
be, the  distributor  of the shares of several  investment  companies  or series
(collectively,  the "Investment Entites"),  including Investment Entities having
investment  objectives  similar  to those of the  Portfolios.  The Fund  further
understands that investors and potential  investors in the Portfolios may invest
in  shares  of  such  other  Investment  Entities.  The  Fund  agrees  that  the
Distributor's duties to such Investment Entities shall not be deemed in conflict
with its duties to the Fund under this Section 1.4.

     1.5 The Distributor  shall not utilize any materials in connection with the
sale or  offering  of Shares  except  the Fund's  then  current  Prospectus  and
Statement of Additional  Information  and such other materials as the Fund shall
provide or approve.  The Fund agrees to furnish the Distributor  with sufficient
copies of any and all  communications  with the public or other  materials which
the Fund intends to use in connection any sales of Shares,  in adequate time for
the  Distributor to file and clear such  materials  with the proper  authorities
before they are put in use. The Distributor and the Fund may agree that any such
material does not need to be filed subsequent to distribution.  In addition, the
Fund agrees not to use any such materials until so filed and cleared for use, if
required, by appropriate authorities as well as by the Distributor.

     1.6 All  activities by the  Distributor  and its agents and  employees,  as
distributor  of the Shares,  shall comply with all  applicable  laws,  rules and
regulations,  including,  without limitation,  all rules and regulations made or
adopted by the SEC or the National Association of Securities Dealers.

     1.7  Distributor  will  transmit any orders  received by it for purchase or
redemption of the Shares to the transfer agent for the Fund.

     1.8 ever in its judgment such action is warranted,  the Fund may decline to
accept any orders for,  or make any sales of, the Shares  until such time as the
Fund deems it  advisable  to accept such orders and to make such sales,  and the
Fund shall notify the Distributor promptly of any such determination.

     1.9 Fund agrees to execute any and all documents and to furnish any and all
information  and otherwise to take all actions that may be reasonably  necessary
in connection with the qualification of the Shares for sale in such states where
Shares are offered for sale. The Fund shall notify the Distributor in writing of
the states in which the Shares are to be sold and shall  notify the  Distributor
in  writing  of  any  changes  to the  information  contained  in  the  previous
notification.

     1.10 Fund shall furnish from time to time,  for use in connection  with the
sale of the Shares,  such information with respect to the Fund and the Shares as
the  Distributor  may  reasonably  request;  and  the  Fund  warrants  that  the
statements contained in any such information shall fairly show or represent what
they purport to show or represent.  The Fund shall also furnish the  Distributor
upon request with:  (a) audited  annual  statements  and  unaudited  semi-annual
statements  of a  Portfolio's  books and  accounts  prepared  by the  Fund,  (b)
quarterly earnings statements of a Portfolio prepared by the Fund, (c) a monthly
itemized list of the  securities in a Portfolio,  (d) monthly  balance sheets as
soon as practicable  after the end of each month, and (c) from time to time such
additional  information  regarding the financial condition of a Portfolio as the
Distributor may reasonably request.

     1.11 Fund represents to the Distributor  that all  Registration  Statements
and Prospectuses  filed by the Fund with the SEC under the 1933 Act with respect
to the Shares have been prepared in conformity with the requirements of the 1933
Act  and the  rules  and  regulations  of the  SEC  thereunder.  As used in this
Agreement,  the  term  "Registration  Statement"  shall  mean  any  Registration
Statement  and  any  Prospectus  and any  Statement  of  Additional  Information
relating  to the Fund  filed  with  the SEC and any  amendments  or  supplements
thereto at any time filed with the SEC. Except as to information included in the
Registration  Statement in reliance upon information provided to the Fund by the
Distributor  or  any  affiliate  of the  Distributor  expressly  for  use in the
Registration Statement, the Fund represents and warrants to the Distributor that
any Registration Statement,  when such Registration Statement becomes effective,
will contain  statements  required to be stated  therein in conformity  with the
1933 Act and the rules and  regulations  of the SEC; that all statements of fact
contained in any such Registration  Statement will be true and correct when such
Registration  Statement becomes  effective;  and that no Registration  Statement
when such  Registration  Statement  becomes  effective  will  include  an untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary to make the  statements  therein not misleading to a
purchaser  of the Shares.  The  Distributor  may but shall not be  obligated  to
propose  from time to time such  amendment  or  amendments  to any  Registration
Statement and such  supplement or supplements to any Prospectus as, in the light
of future  developments,  may, in the opinion of the Distributor's  counsel,  be
necessary or advisable.  The  Distributor  shall promptly notify the Fund of any
advice given to it by its counsel  regarding  the necessity or  advisability  of
amending or supplementing  such  Registration  Statement.  If the Fund shall not
propose such amendment or amendments  and/or  supplement or  supplements  within
fifteen days after receipt by the Fund of a written request from the Distributor
to do so, the Distributor may, at its option, terminate this Agreement. The Fund
shall not file any amendment to any Registration  Statement or supplement to any
Prospectus without giving the Distributor  reasonable notice thereof in advance;
provided,  however,  that nothing  contained in this Agreement  shall in any way
limit the Fund's right to file at any time such  amendments to any  Registration
Statement and/or supplements to any Prospectus,  of whatever  character,  as the
Fund  may  deem  advisable,  such  right  being  in all  respects  absolute  and
unconditional.  The Fund  authorizes  the  Distributor  to use any Prospectus or
Statement of Additional  Information in the form furnished by the Fund from time
to time in connection with the sale of the Shares.

     1.12 Shares  shall be offered by either the  Distributor  or the Fund under
any of the  provisions of this  Agreement and no orders for the purchase or sale
of  Shares  hereunder  shall  be  accepted  by  the  Fund  if  and  so  long  as
effectiveness  of the  Registration  Statement  then in effect or any  necessary
amendments  thereto shall be suspended  under any of the  provisions of the 1933
Act, or if and so long as a current Prospectus as required by Section 5(b)(2) of
the  1933  Act is not on file  with the SEC;  provided,  however,  that  nothing
contained in this Section 1.12 shall in any way restrict or have any application
to or  bearing  upon  the  Fund's  obligation  to  redeem  Shares  tendered  for
redemption by any  shareholder  in accordance  with the provisions of the Fund's
Registration Statement or Agreement and Declaration of Trust.

     1.13 The Fund  agrees  to  advise  the  Distributor  as soon as  reasonably
practical by a notice in writing delivered to the Distributor:

               (a)  of any request by the SEC for amendments to the Registration
                    Statement, Prospectus or Statement of Additional Information
                    then in effect or for additional information;

               (b)  in the event of the  issuance  by the SEC of any stop  order
                    suspending the effectiveness of the Registration  Statement,
                    Prospectus  or Statement of Additional  Information  then in
                    effect or the  initiation  by service of process on the Fund
                    of any proceeding for that purpose;

               (c)  of  the  happening  of  any  event  that  makes  untrue  any
                    statement  of a  material  fact  made  in  the  Registration
                    Statement, Prospectus or Statement of Additional Information
                    then in effect or that  requires  the  making of a change in
                    such  Registration  Statement,  Prospectus  or  Statement of
                    Additional  Information  in  order  to make  the  statements
                    therein not misleading; and

               (d)  of all actions of the SEC with respect to any  amendments to
                    any  Registration  Statement,  Prospectus  or  Statement  of
                    Additional  Information which may from time to time be filed
                    with the SEC.

         For purposes of this Section 1.13,  informal requests by or acts of the
staff of the SEC shall not be deemed actions of or requests by the SEC.

     1.14 The Fund represents and warrants to the  Distributor  that the Fund is
an investment  company registered under the 1940 Act and the Shares sold by each
Portfolio are, and will be, registered under the 1933 Act.

     1.15 The  Distributor  agrees to  maintain,  and  preserve  for the periods
prescribed  by Rule 31a-2 under the 1940 Act, such records as are required to be
maintained by Rule 31a-1(d) under the 1940 Act.

2. Compensation and Expenses

         The Fund will bear the following expenses:

               (a)  preparation,  printing and distribution of sufficient copies
                    of the Prospectus and Statement of Additional Information to
                    existing shareholders;

               (b)  preparation,  printing and distribution of reports and other
                    communications (not prepared by the Distributor) to existing
                    shareholders;

               (c)  registration  of the  Shares  under  the  federal  and state
                    securities laws;

               (d)  maintaining facilities for the issue and transfer of Shares;

               (e)  supplying information, prices and other data to be furnished
                    by the Fund under this Agreement;

               (f)  any original issue taxes or other transfer taxes  applicable
                    to the  sale  or  delivery  of the  Shares  or  certificates
                    therefor; and

               (g)  any  payments  made in  accordance  with any plan  hereafter
                    adopted pursuant to Rule 12b-1 under the 1940 Act.

3.  Indemnification

     3.1 The Fund agrees to indemnify  and hold the  Distributor,  its officers,
directors, and employees, and any person who controls the Distributor within the
meaning of Section 15 of the 1933 Act,  free and  harmless  from and against any
and all claims,  costs, expenses (including reasonable attorneys' fees), losses,
damages,  charges,  payments  and  liabilities  of any  sort or kind  which  the
Distributor, its officers,  directors,  employees or any such controlling person
may incur under the 1933 Act,  under any other  statute,  or under common law or
otherwise,  arising  out of or based upon (i) any untrue  statement,  or alleged
untrue  statement,  of a material  fact  contained  in the  Fund's  Registration
Statement,   Prospectus  or  Statement  of  Additional   Information  (including
amendments and supplements  thereto), or (ii) any omission, or alleged omission,
to state a  material  fact  required  to be  stated in the  Fund's  Registration
Statement,   Prospectus  or  Statement  of  Additional   Information  (including
amendments or supplements  thereto) or necessary to make the statements  therein
not misleading;  provided, however, that insofar as any losses, claims, damages,
costs, charges, payments, liabilities or expenses arise out of or are based upon
any such untrue  statement or omission or alleged  untrue  statement or omission
made in reliance on and in conformity with information  furnished to the Fund by
the  Distributor  or its affiliated  persons for use in the Fund's  Registration
Statement,   Prospectus  or  Statement  of  Additional   Information  (including
amendments or supplements thereto), such indemnification is not applicable;  and
further  provided that the Fund's agreement to indemnify the Distributor and the
Fund's  representations  and warranties  hereinbefore  set forth in Section 1.11
shall not be deemed to cover any liability to the Fund,  its officers,  trustees
or shareholders  to which the  Distributor  would otherwise be subject by reason
of: (a) the Distributor's  willful  misfeasance,  bad faith or negligence in the
performance  of its duties and  obligations,  or by reason of the  Distributor's
reckless  disregard of its duties and obligations  under this Agreement;  or (b)
the  Distributor's  breach of Section 12 of this Agreement.  The Fund agrees and
acknowledges that the Distributor has not prior to the date hereof assumed,  and
will not assume,  any  obligations or liabilities  arising out of the conduct of
the Fund or its  distributor  prior to the date hereof of those duties which the
Distributor has agreed to perform  pursuant to this Agreement.  The Fund further
agrees to  indemnify  the  Distributor  against any losses,  claims,  damages or
liabilities to which the  Distributor  may become subject in connection with the
conduct by the Fund or its  distributor of such duties prior to the date hereof;
provided  that the Fund's  agreement to indemnify the  Distributor  shall not be
deemed  to  cover  any  liability  to  the  Fund,  its  officers,   trustees  or
shareholders  to which the  Distributor  would otherwise be subject by reason of
willful  misfeasance,  bad faith or negligence in the  performance of its duties
and obligations,  or by reason of the  Distributor's  reckless  disregard of its
duties and obligations under this Agreement.

     3.2 The  Distributor  agrees to indemnify and hold  harmless the Fund,  its
several officers and trustees and each person,  if any, who controls a Portfolio
within the  meaning of Section 15 of the 1933 Act,  from and against any and all
claims, costs, expenses (including reasonable attorneys' fees), losses, damages,
charges,  payments  and  liabilities  of any sort or kind  which the  Fund,  its
officers or trustees,  or any such controlling  person, may incur under the 1933
Act, under any other statute, or under common law or otherwise,  but only to the
extent that such  liability  or expense  incurred by the Fund,  its  officers or
trustees,  or any  controlling  person,  resulting  from such claims or demands,
shall  arise out of or be based upon any  untrue  statement,  or alleged  untrue
statement,  of a material fact contained in the Fund's  Registration  Statement,
Prospectus  or Statement of Additional  Information  (including  amendments  and
supplements  thereto), or any omission, or alleged omission, to state a material
fact required to be stated therein or necessary to make the  statements  therein
not  misleading,  if such  statement  or  omission  was  made in  reliance  upon
information  furnished  or  confirmed  to the  Fund  by the  Distributor  or its
affiliated  persons (as defined in the 1940 Act). The Distributor also agrees to
indemnify  and  hold  harmless  the  Fund,  its  officers  or  trustees,  or any
controlling  person  in  connection  with any  claim or in  connection  with any
action,  suit or  proceeding  which arises out of or is alleged to arise out of:
(a) the  Distributor's  willful  misfeasance,  bad  faith or  negligence  in the
performance  of its duties  and  obligations  or by reason of the  Distributor's
reckless  disregard of its duties and obligations  under this Agreement;  or (b)
the Distributor's  breach of Section 12 of this Agreement.  The foregoing rights
of  indemnification  shall be in addition to any other rights to which the Fund,
its officers or trustees,  or any  controlling  person shall be entitled to as a
matter of law.


     3.3 In any case in which one party hereto (the "Indemnifying Party") may be
asked to  indemnify  or hold the other party  hereto (the  "Indemnified  Party")
harmless,  the Indemnified  Party will notify the Indemnifying  Party in writing
promptly after  identifying any situation which it believes  presents or appears
likely to  present  a claim for  indemnification  (an  "Indemnification  Claim")
against the Indemnifying Party,  although the failure to do so shall not relieve
the  Indemnifying  Party from any liability  which it may otherwise  have to the
Indemnified  Party, and the Indemnified Party shall keep the Indemnifying  Party
advised  with  respect  to  all  developments  concerning  such  situation.  The
Indemnifying  Party shall be entitled to  participate  at its own expense in the
defense, or if it so elects, to assume the defense of, any Indemnification Claim
which may be the  subject of this  indemnification,  and,  in the event that the
Indemnifying Party so elects, such defense shall be conducted by counsel of good
standing chosen by the Indemnifying Party and approved by the Indemnified Party,
which approval shall not be unreasonably withheld. In the event the Indemnifying
Party elects to assume the defense of any such Indemnification  Claim and retain
such  counsel,  the  Indemnified  Party shall bear the fees and  expenses of any
additional  counsel  retained by the  Indemnified  Party.  In the event that the
Indemnifying   Party  does  not  elect  to  assume  the   defense  of  any  such
Indemnification  Claim,  or in case the  Indemnified  Party  reasonably does not
approve  of  counsel  chosen by the  Indemnifying  Party,  or in case there is a
conflict of interest  between the Indemnifying  Party or the Indemnified  Party,
the  Indemnifying  Party will reimburse the  Indemnified  Party for the fees and
expenses  of any  counsel  retained by the  Indemnified  Party.  The Fund agrees
promptly to notify the  Distributor  of the  commencement  of any  litigation or
proceedings  against the Fund or any of its  officers or trustees in  connection
with  the  issue  and  sale of any of the  Shares,  and the  Distributor  agrees
promptly to notify the Fund of the commencement of any litigation or proceedings
against  the  Distributor  or any  of  its  officers,  directors,  employees  or
controlling  persons  in  connection  with the  issuance  and sale of any of the
Shares. The Indemnified Party will not confess any Indemnification Claim or make
any  compromise  in any case in which the  Indemnifying  Party  will be asked to
provide  indemnification,  except with the  Indemnifying  Party's  prior written
consent.

     3.4 The  obligations  of the  parties  hereto  under  this  Section 3 shall
survive the termination of this Agreement.

     3.5 The Fund's  indemnification  agreement  contained in this Section 3 and
the  Fund's  representations  and  warranties  in this  Agreement  shall  remain
operative and in full force and effect regardless of any  investigation  made by
or on behalf of the Distributor,  its officers,  directors and employees, or any
controlling person, and shall survive the delivery of any Shares. This agreement
of indemnity will inure exclusively to the Distributor's benefit, to the benefit
of its several officers,  directors and employees,  and their respective estates
and to the benefit of its controlling persons and their successors.

     3.6 The Distributor's indemnification agreement contained in this Section 3
and the  Distributor's  representations  and warranties in this Agreement  shall
remain  operative and in full force and effect  regardless of any  investigation
made  by or on  behalf  of  the  Fund  or  its  officers  and  trustees,  or any
controlling  person,  and shall survive the delivery of any Shares.

4. Standard of Care; Limitation of Liability

     4.1 The  Distributor  shall  not be  liable  to the Fund  for any  error of
judgment or mistake of law or for any loss  suffered  by the Fund in  connection
with the performance of its obligations and duties under this Agreement,  except
a loss resulting from: (a) the Distributor's  willful misfeasance,  bad faith or
negligence in the performance of such  obligations  and duties,  or by reason of
its reckless disregard thereof, or (b) the Distributor's breach of Section 12 of
this Agreement.

     4.2 Each party shall have the duty to mitigate  damages for which the other
party may become responsible.

     4.3 NOTWITHSTANDING ANYTHING IN THIS AGREEMENT TO THE CONTRARY, IN NO EVENT
SHALL EITHER PARTY, ITS AFFILIATES OR ANY OF ITS OR THEIR  DIRECTORS,  TRUSTEES,
OFFICERS,  EMPLOYEES,  AGENTS OR SUBCONTRACTORS BE LIABLE TO THE OTHER PARTY FOR
CONSEQUENTIAL DAMAGES, PROVIDED, HOWEVER, THAT NOTHING CONTAINED IN THIS SECTION
4.3 SHALL BE CONSTRUED SO AS TO LIMIT THE RIGHTS OF ANY SHAREHOLDER OF THE FUND,
WHETHER SUING ON HIS, HER OR ITS OWN BEHALF OR DERIVATIVELY THROUGH THE FUND, TO
CONSEQUENTIAL DAMAGES.

5. Term

    5.1 This  Agreement  shall become  effective on the date first written above
and, unless sooner terminated as provided herein, shall continue until April 30,
2000 and thereafter shall continue  automatically for successive one-year terms,
provided such continuance is specifically  approved at least annually by (i) the
Fund's Board of Trustees or (ii) by a vote of a majority (as defined in the 1940
Act and Rule l8f-2 thereunder) of the outstanding voting securities of the Fund,
provided that in either event the  continuance is also approved by a majority of
the trustees who are not parties to this  Agreement  and who are not  interested
persons  (as  defined in the 1940 Act) of any party to this  Agreement,  by vote
cast in person at a meeting  called for the purpose of voting on such  approval.
This Agreement is terminable  without  penalty,  on at least sixty days' written
notice,  by the Fund's Board of  Trustees,  by vote of a majority (as defined in
the 1940 Act and Rule 18f-2 thereunder) of the outstanding  voting securities of
the  Fund,  or  by  the   Distributor.   This   Agreement  will  also  terminate
automatically in the event of its assignment (as defined in the 1940 Act and the
rules thereunder).

     5.2 In the event a  termination  notice  is given by the Fund and  provided
that the  Distributor is not in default under this Agreement at the time of such
termination  notice,  all  expenses  associated  with  movement  of records  and
materials and conversion thereof to a successor distributor will be borne by the
Fund.


6. Modifications and Waivers

         No  change,  termination,  modification,  or  waiver  of  any  term  or
         condition of the Agreement  shall be valid unless in writing  signed by
         each  party.  No  such  writing  shall  be  effective  as  against  the
         Distributor unless said writing is executed by a Senior Vice President,
         Executive  Vice  President  or President  of the  Distributor.  No such
         writing  shall be  effective as against the Fund unless said writing is
         executed by the  Chairman of the Fund's  Board of  Trustees.  A party's
         waiver of a breach of any term or condition in the Agreement  shall not
         be deemed a waiver of any subsequent breach of the same or another term
         or condition.

7. No Presumption Against Drafter

         The  Distributor  and  the  Fund  have  jointly   participated  in  the
         negotiation  and drafting of this  Agreement.  The  Agreement  shall be
         construed as if drafted jointly by the Fund and the Distributor, and no
         presumptions  arise  favoring any party by virtue of the  authorship of
         any provision of this Agreement.

8. Publicity

         Neither  the  Distributor  nor the Fund shall  release or publish  news
         releases, public announcements, advertising or other publicity relating
         to this  Agreement or to the  transactions  contemplated  by it without
         prior  review  and  written  approval  of the  other  party;  provided,
         however, that either party may make such disclosures as are required by
         legal,  accounting or regulatory  requirements  after making reasonable
         efforts in the  circumstances  to  consult  in  advance  with the other
         party.

9. Severability

         The parties  intend every  provision of this Agreement to be severable.
         If a court  of  competent  jurisdiction  determines  that  any  term or
         provision  is illegal or invalid  for any  reason,  the  illegality  or
         invalidity  shall not  affect the  validity  of the  remainder  of this
         Agreement.  In such case,  the  parties  shall in good faith  modify or
         substitute  such provision  consistent  with the original intent of the
         parties.  Without limiting the generality of this paragraph, if a court
         determines  that any remedy stated in this  Agreement has failed of its
         essential  purpose,  then all other  provisions of this Agreement shall
         remain fully effective.

10. Force Majeure

         No party shall be liable for any default or delay in the performance of
         its obligations  under this Agreement if and to the extent such default
         or delay is caused,  directly or indirectly,  by  circumstances  beyond
         such party's reasonable  control. In any such event, the non-performing
         party shall be excused from any further  performance  and observance of
         the  obligations  so  affected  only for so long as such  circumstances
         prevail and such party continues to use commercially reasonable efforts
         to recommence performance or observance as soon as practicable.

11. Miscellaneous

     11.1  Any  notice  or  other  instrument  authorized  or  required  by this
Agreement  to be  given  in  writing  to the  Fund or the  Distributor  shall be
sufficiently  given if  addressed  to the party and received by it at its office
set forth below or at such other place as it may from time to time  designate in
writing.

                                            To the Fund:

                                            James D. Grassi, Esq.
                                            The Northern Trust Company
                                            50 South LaSalle Street - M-9
                                            Chicago, IL  60675

                                            with a copy to:

                                            W. Bruce McConnel, III Esq.
                                            Philadelphia National Bank Building
                                            1345 Chestnut Street
                                            Philadelphia, PA  19107

                                            To the Distributor:

                                            Philip Rinnander
                                            c/o Provident Distributors, Inc.
                                            Four Falls Corporate Center
                                            6th Floor
                                            West Conshohocken, PA  19428-2961


     11.2  The  laws  of  the  Commonwealth  of  Massachusetts,   excluding  the
applicable  provisions  of  the  1940  Act,  shall  govern  the  interpretation,
validity,  and  enforcement of this  Agreement.  To the extent the provisions of
Massachusetts  law or the provisions hereof conflict with the 1940 Act, the 1940
Act shall control.  All actions  arising from or related to this Agreement shall
be brought in the state and federal  courts  sitting in the City of Boston,  and
the  Distributor  and  the  Fund  hereby  submit  themselves  to  the  exclusive
jurisdiction of those courts.

     11.3 This Agreement may be executed in any number of counterparts,  each of
which shall be deemed to be an original and which  collectively  shall be deemed
to constitute only one instrument.

     11.4 The  captions  of this  Agreement  are  included  for  convenience  of
reference only and in no way define or delimit any of the  provisions  hereof or
otherwise affect their construction or effect.

     11.5 This Agreement shall be binding upon and shall inure to the benefit of
the parties hereto and their respective successors and is not intended to confer
upon any other person any rights or remedies hereunder.

12. Confidential

     12.1 The parties agree that the Proprietary  Information (defined below) is
confidential information of the parties and their respective licensers. The Fund
and the  Distributor  shall  exercise at least the same degree of care,  but not
less than reasonable care, to safeguard the  confidentiality  of the Proprietary
Information  of the other as it would protect its own  Proprietary  Information.
The  Fund  and  the  Distributor  may use the  Proprietary  Information  only to
exercise their respective  rights or perform their respective  duties under this
Agreement.  Except as otherwise  required by law,  the Fund and the  Distributor
shall not duplicate,  sell or disclose to others the Proprietary  Information of
the other,  in whole or in part,  without the prior  written  permission  of the
other party. The Fund and the Distributor  may,  however,  disclose  Proprietary
Information  to  their  respective  employees  who  have  a  need  to  know  the
Proprietary  Information  to perform work for the other,  provided that the Fund
and the Distributor shall use reasonable  efforts to ensure that the Proprietary
Information  is not  duplicated  or disclosed by their  respective  employees in
breach of this  Agreement.  The Fund and the  Distributor  may also disclose the
Proprietary  Information to independent  contractors,  auditors and professional
advisors,  provided  they first agree in writing to be bound by  confidentiality
obligations  substantially  similar  to this  Section  12.  Notwithstanding  the
previous sentence, in no event shall either the Fund or the Distributor disclose
the  Proprietary  Information to any  competitor of the other without  specific,
prior written consent.

     12.2 Proprietary Information means:

          (a) any data or information that is completely sensitive material, and
          not  generally  known to the  public,  including,  but not limited to,
          information  about  product  plans,  marketing  strategies,   finance,
          operations,   customer   relationships,   customer   profiles,   sales
          estimates,  business plans, and internal  performance results relating
          to the past, present or future business  activities of the Fund or the
          Distributor,  their respective  subsidiaries and affiliated  companies
          and the customers, clients and suppliers of any of them;

          (b)  any  scientific  or  technical  information,   design,   process,
          procedure,  formula, or improvement that is commercially  valuable and
          secret in the sense that its  confidentiality  affords the Fund or the
          Distributor a competitive advantage over its competitors;

          (c) all confidential or proprietary concepts, documentation,  reports,
          data,  specifications,  computer  software,  source code, object code,
          flow  charts,  databases,  inventions,  know-how,  show-how  and trade
          secrets, whether or not patentable or copyrightable;

          (d) all documents, inventions,  substances, engineering and laboratory
          notebooks,  drawings,  diagrams,  specifications,  bills of  material,
          equipment, prototypes and models, and any other tangible manifestation
          of the  foregoing  of  either  party  which now exist or come into the
          control or possession of the other; and

          (e) with  respect  to the Fund,  all  records  and  other  information
          relative to the Fund and its prior, present or potential  shareholders
          (and clients of such shareholders).

     12.3  Notwithstanding the foregoing,  it is hereby understood and agreed by
the parties  hereto that any marketing  strategies,  financing  plans,  customer
profiles, sales estimates, business plans or similar items prepared or developed
by the  Distributor  for  the  benefit  of the  Fund  shall  be  considered  the
Proprietary  Information  of the Fund and  nothing  in this  Agreement  shall be
construed  to prevent or  prohibit  the Fund from  disclosing  such  Proprietary
Information to a successor distributor.

     12.4 The  obligations  of the parties  hereto  under this  Section 12 shall
survive the termination of this Agreement.


13. Trustee and Shareholder Liability

         This  Agreement is executed by or on behalf of the Fund with respect to
         each of the  Portfolios and the  obligations  hereunder are not binding
         upon  any  of the  trustees,  officers  or  shareholders  of  the  Fund
         individually  but are  binding  only upon the  Portfolio  to which such
         obligations pertain and the assets and property of such Portfolio.  All
         obligations  of the Fund under  this  Agreement  shall  apply only on a
         Portfolio-by-Portfolio basis, and the assets of one Portfolio shall not
         be  liable  for  the  obligations  of  another  Portfolio.  The  Fund's
         Declaration of Trust is on file with the Secretary of the  Commonwealth
         of Massachusetts.

14. Entire Agreement

         This Agreement,  including all Schedules hereto, constitutes the entire
         agreement between the parties with respect to the subject matter hereof
         and supersedes  all prior and  contemporaneous  proposals,  agreements,
         contracts,  representations,  and  understandings,  whether  written or
         oral, between the parties with respect to the subject matter hereof.


<PAGE>


         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed all as of the day and year first above written.


         NORTHERN INSTITUTIONAL FUNDS



         By: /s/Jylanne Dunne

         Name: Jylanne Dunne

         Title: President




         NORTHERN FUNDS DISTRIBUTORS, LLC



         By: /s/Philip H. Rinnander

         Name: Philip H. Rinnander

         Title: President

<PAGE>


                                   SCHEDULE A

                               LIST OF PORTFOLIOS


Non-International Portfolios:

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
Municipal Portfolio
U.S. Government Securities Portfolio
Short-Intermediate Bond Portfolio
U.S. Treasury Index Portfolio
Bond Portfolio
Intermediate Bond Portfolio
Balanced Portfolio
Equity Index Portfolio
Diversified Growth Portfolio
Focused Growth Portfolio
Small Company Index Portfolio
Small Company Growth Portfolio
MidCap Growth Portfolio
MarketPower Portfolio

International Portfolios:

International Bond Portfolio
International Equity Index Portfolio
International Growth Portfolio



<PAGE>


                                   SCHEDULE B

                              DISTRIBUTION SERVICES

     The Distributor shall, at its own expense,  finance appropriate  activities
which are primarily intended to result in the sale of the Shares.  Such services
shall include, but are not limited to:

1.       Preparation and execution of selling agreements
                  monitoring accruals
                  monitoring expenses
                  making disbursements for expenses and fees

2.       Advertising and sales literature submission to the NASD

3.       Investor qualification calls, as necessary

4.     Printing and mailing of Prospectuses to other than existing shareholders



                                                                Exhibit h(9)


                          NORTHERN INSTITUTIONAL FUNDS
                        (formerly, "The Benchmark Funds")

                           SHAREHOLDER SERVICING PLAN
                            FOR CLASS C AND D SHARES

                  Section  1.  Upon the  recommendation  of The  Northern  Trust
Company,  the Trust's investment adviser  ("Northern"),  any officer of Northern
Institutional  Funds (the "Trust") is authorized to execute and deliver,  in the
name and on behalf of the Trust,  written  agreements in substantially the forms
attached  hereto or in any other forms  previously or hereafter  approved by the
Board of  Trustees  of the  Trust  or,  after the  Trust's  reorganization  as a
Delaware  business trust, the Trust's  successor  ("Servicing  Agreements") with
various financial  institutions and other organizations  ("Servicing Agents") of
Class C and/or D Shares of the Equity Index,  Small Company  Index,  Diversified
Growth,  Focused  Growth,  U.S.  Treasury  Index,  U.S.  Government  Securities,
Short-Intermediate  Bond,  Bond,  Intermediate  Bond,  Balanced,   International
Growth,  International  Bond,  International  Equity Index,  Global Asset, Small
Company Growth,  Mid Cap Growth and  MarketPower  Portfolios  (collectively  the
"Funds" or individually,  a "Fund"). Such Servicing Agreements shall require the
Servicing Agents to provide,  or to arrange to provide,  support services as set
forth therein to their customers,  clients, employees and others ("Clients") who
beneficially  own Shares of  beneficial  interest  in Class C and/or D of one or
more of the Funds ("Fund Shares") in consideration for a fee, computed daily and
paid monthly in the manner set forth in the Servicing Agreements,  at the annual
rate of up to .15% and .25% of the  average  daily  net  asset  value of Class C
and/or D Shares of a Fund, respectively,  held by the Servicing Agents on behalf
of  their  Clients.  All  expenses  incurred  by the  Trust in  connection  with
Servicing  Agreements for Class C and/or D Shares of a particular  Fund shall be
allocated  entirely to such Class C and/or D Shares of that particular Fund. The
fee  allocated to the Class C and/or D Shares of a particular  Fund shall be the
several  (and not joint or joint and several)  obligation  of each such Class of
such Fund.

         Section 2. Northern  shall monitor the  arrangements  pertaining to the
Trust's Servicing Agreements with Servicing Agents. Northern shall not, however,
be  obliged  by this Plan to  recommend,  and the Trust  shall not be obliged to
execute, any Servicing Agreement with any qualifying Servicing Agent.

         Section 3. So long as this Plan is in effect, Northern shall provide to
the  Trust's  Board  of  Trustees,  and the  Trustees  shall  review,  at  least
quarterly,  a written report of the amounts  expended  pursuant to this Plan and
the purposes for which such expenditures were made.

         Section 4. This Plan shall  become  effective  with  respect to Class C
and/or D Shares  of a  particular  Fund upon the  approval  of the Plan (and the
relevant form of Servicing Agreement attached hereto) by a majority of the Board
of  Trustees,  including  a majority  of the  Trustees  who are not  "interested
persons"  as defined in the  Investment  Company  Act of 1940 (the "Act") of the
Trust and have no direct or indirect financial interest in the operation of this
Plan or in any  Servicing  Agreements or other  agreements  related to this Plan
(the "Disinterested  Trustees"),  pursuant to a vote cast in person at a meeting
called for the purpose of voting on the approval of this Plan (and relevant form
of  Servicing  Agreement)  with  respect  to  such  Class  C  and/or  D  Shares,
respectively.

         Section 5. Unless sooner  terminated,  this Plan shall  continue  until
April 30, 1999 and thereafter shall continue automatically for successive annual
periods  ending on April 30,  provided  such  continuance  is  approved at least
annually in the manner set forth in Section 4.

         Section  6.  This  Plan  may be  amended  at any  time by the  Board of
Trustees,  provided that any material amendments of the terms of this Plan shall
become effective only upon the approval set forth in Section 4.

         Section 7. This Plan is terminable at any time by vote of a majority of
the Disinterested Trustees.

         Section 8. While this Plan is in effect,  the selection and  nomination
of those  Trustees who are not  "interested  persons" (as defined in the Act) of
the Trust shall be committed to the discretion of the Disinterested Trustees.

         Section 9.  The Trust has adopted this Shareholder Services Plan as of
 April 27, 1993 and last revised this Plan as of October 5, 1999.

         Section 10. All persons  dealing with the Trust must look solely to the
Trust's property for the enforcement of any claims against the Trust, as neither
the Trustees, officers, agents nor shareholders of the Trust assume any personal
liability for obligation entered into on the Trust's behalf.


<PAGE>



                                                                    FORM

Northern Institutional Funds
(formerly, "The Benchmark Funds")
4900 Sears Tower
Chicago, Illinois 60606

                                                 SERVICING AGREEMENT
                                                 For Class C Shares

Gentlemen:

         We wish to enter into this Servicing  Agreement with you concerning the
provision  of  administrative  support  services  to  your  customers,  clients,
employees   and  others   ("Customers")   and  other   investors   ("Investors")
(collectively  "Clients") who may from time to time  beneficially  own shares of
beneficial interest in Class C of one or more of the portfolios which are listed
on Appendix A hereto  (collectively  the  "Funds,"  and  individually  a "Fund")
offered by Northern Institutional Funds ("Fund Shares").

         The terms and conditions of this Servicing Agreement are as follows:

                  Section 1. You agree to provide or arrange  for the  provision
of one or more of the  following  services  to Clients who may from time to time
beneficially own Fund Shares: (1) establishing and maintaining  separate account
records of  Customers  or other  Investors;  (2)  providing  Customers  or other
Investors  with a service that invests  their assets in Fund Shares  pursuant to
specific  or  pre-authorized  instructions,  and  assistance  with  new  account
applications;  (3) aggregating and processing  purchase and redemption  requests
for Fund Shares from  Customers  or other  Investors,  and placing  purchase and
redemption  orders  with  the  Transfer  Agent;  (4)  issuing  confirmations  to
Customers or other  Investors in accordance  with  applicable law; (5) arranging
for the timely  transmission  of funds  representing  the net purchase  price or
redemption proceeds;  (6) processing dividend payments on behalf of Customers or
other Investors;  (7) providing  information  periodically to Customers or other
Investors showing their positions in Fund Shares;  (8) responding to Customer or
other Investor inquiries  (including requests for prospectuses),  and complaints
relating to the services  performed by the  institutions;  (9) acting as liaison
with respect to all inquiries and complaints  from Customers and other Investors
relating  to errors  committed  by the Trust or its  agents,  and other  matters
pertaining  to the Trust;  (10)  providing  or arranging  for another  person to
provide  subaccounting  with  respect  to  Fund  Shares  beneficially  owned  by
Customers or other Investors;  (11) if required by law,  forwarding  shareholder
communications from the Trust (such as proxy statements and proxies, shareholder
reports, annual and semi-annual financial statements and dividend,  distribution
and tax notices) to Customers and other  Investors;  (12)  providing such office
space,  facilities  and  personnel  as may be required to answer  questions  and
respond to inquiries;  (13)  maintaining  appropriate  management  reporting and
statistical  information;  (14) paying  expenses  related to the  preparation of
educational and other  explanatory  materials in connection with the development
of investor services;  (15) developing and monitoring  investment  programs;  or
(16) providing such other similar  services as the Trust may reasonably  request
to the extent the  Institutions  are  permitted to do so under  applicable  law,
rules and regulations.

                  Section  2.  We  recognize  that  you  may be  subject  to the
provisions  of the  Glass-Steagall  Act and other laws  governing,  among  other
things,  the conduct of activities by Federally  chartered and supervised  banks
and other banking  organizations.  As such, you are restricted in the activities
you may undertake and for which you may be paid and, therefore, you will perform
only those  activities  which are consistent  with your statutory and regulatory
obligations.  You will act solely as agent  for,  upon the order of, and for the
account of, your Clients.

                  Section 3. In performing your duties hereunder,  you shall act
in conformity  with the then  effective  prospectus  and statement of additional
information  applicable to the Fund Shares,  the Investment  Company Act of 1940
and all other applicable  Federal and State banking,  securities and other laws,
regulations and rulings. You will assume sole responsibility for your compliance
with  applicable  Federal  and  State  laws  and  regulations,  and  shall  rely
exclusively upon your own  determination,  or that of your legal advisers,  that
the  performance  of  your  duties   hereunder   complies  with  such  laws  and
regulations. You shall perform your duties hereunder in a manner consistent with
the customs and practices of other financial  institutions  that provide similar
services.

                  Section 4. You will provide  such office space and  equipment,
telephone  facilities  and  personnel  (which  may be  any  part  of the  space,
equipment  and  facilities  currently  used in your  business,  or any personnel
employed  by you) as may be  reasonably  necessary  or  beneficial  in  order to
provide such services to Clients.

                  Section 5. Neither you nor any of your officers,  employees or
agents are authorized to make any  representations  concerning us or Fund Shares
except those contained in our then current prospectuses for such Shares,  copies
of which will be supplied by us to you, or in such  supplemental  literature  or
advertising as may be authorized by us in writing.

                  Section  6. For all  purposes  of this  Agreement  you will be
deemed to be an  independent  contractor,  and will have no  authority to act as
agent for us in any matter,  or in any respect.  By your written  acceptance  of
this Agreement, you agree to and do release, indemnify and hold us harmless from
and against any and all direct or indirect  liabilities or losses resulting from
requests,  directions,  actions  or  inactions  of or by you or  your  officers,
employees or agents regarding your  responsibilities  hereunder or the purchase,
redemption,  transfer or registration of Fund Shares by or on behalf of Clients.
You and your employees will upon request,  be available  during normal  business
hours to consult with us or our designees  concerning  the  performance  of your
responsibilities under this Agreement.

                  Section 7. In  consideration  of the services  and  facilities
provided by you or arranged by you to be provided hereunder, we will pay to you,
and you will accept as full payment  therefor,  a fee at the annual rate of .15%
of the average  daily net asset value of the Fund Shares  beneficially  owned by
your  Clients  for whom you are the dealer of record or holder of record or with
whom you have a servicing  relationship (the "Clients' Fund Shares"),  which fee
will be computed daily and payable monthly. For purposes of determining the fees
payable  under this Section 7, the average daily net asset value of the Clients'
Fund  Shares  will be  computed  in the  manner  specified  in our  registration
statement  (as the same is in effect from time to time) in  connection  with the
computation  of the net asset value of Fund Shares for purposes of purchases and
redemptions.  The fee  rate  stated  above  may be  prospectively  increased  or
decreased  by us,  in our sole  discretion,  at any  time  upon  notice  to you.
Further, we may, in our discretion,  and without notice, suspend or withdraw the
sale of Fund Shares, including the sale of such Shares to you for the account of
any Client or Clients.

                  Section 8. Any person  authorized to direct the disposition of
monies  paid or payable by us  pursuant to this  Agreement  will  provide to our
Board of Trustees,  and our Trustees will review, at least quarterly,  a written
report of the amounts so expended and the  purposes for which such  expenditures
were  made.  In  addition,  you  will  furnish  us or our  designees  with  such
information as we or they may reasonably request (including, without limitation,
periodic  certifications  confirming  the  provision  to Clients of the services
described  herein),  and  will  otherwise  cooperate  with us and our  designees
(including,  without  limitation,  any auditors designated by us), in connection
with the  preparation  of  reports  to our  Board of  Trustees  concerning  this
Agreement and the monies paid or payable by us pursuant  hereto,  as well as any
other  reports or filings that may be required by law.  You will be  responsible
for promptly reporting to us and our Board of Trustees any potential or existing
conflicts with respect to the investments of your Clients in the Funds.

                  Section  9.  We  may  enter  into  other   similar   Servicing
Agreements with any other person or persons without your consent.

                  Section 10. By your written  acceptance of the Agreement,  you
represent,  warrant  and agree  that:  (i) in no event will any of the  services
provided by you  hereunder  be  primarily  intended to result in the sale of any
Fund  Shares  issued by us;  (ii) the  compensation  payable  to you  hereunder,
together  with any other  compensation  payable to you by Clients in  connection
with the  investment  of their assets in the Funds,  will be disclosed by you to
your  Clients,  will be  authorized  by your  Clients  and will not result in an
excessive or unreasonable  fee to you; (iii) in the event an issue pertaining to
this Agreement or our Shareholder Servicing Plan related hereto is submitted for
approval,  you will vote any Fund  Shares  held for your own account in the same
proportion  as the vote of the Fund Shares held for your Clients  benefits;  and
(iv)  you  will  not  engage  in  activities  pursuant  to the  Agreement  which
constitute acting as a broker or dealer under state law unless you have obtained
the licenses required by such law.

                  Section 11. This Agreement will become effective on the date a
fully executed copy of this Agreement is received by us or our designee.  Unless
sooner  terminated,  this  Agreement  will continue until the next April 30, and
thereafter will continue  automatically  for successive annual periods ending on
April 30, provided such  continuance is specifically  approved at least annually
by  us in  the  manner  described  in  Section  15  hereof.  This  Agreement  is
terminable, without penalty, at any time by us (which termination may be by vote
of a majority of our Disinterested  Trustees as defined in Section 15 hereof) or
by you upon notice to the other party hereto.

                  Section 12. All notices and other communications to either you
or us will be duly  given if mailed,  telegraphed,  telexed  or  transmitted  by
similar telecommunications device to the appropriate address shown herein.

                  Section 13. This  Agreement  will be construed  in  accordance
with the laws of the State of  Illinois  and is  non-assignable  by the  parties
hereto.

                  Section  14. All persons  dealing  with us must look solely to
our  property  for the  enforcement  of any claims  against  us, as neither  our
Trustees,  officers,  agents nor shareholders  assume any personal liability for
obligations entered into on our behalf.

                  Section  15.  This  Agreement  has been  approved by vote of a
majority  of (i) our  Board of  Trustees  and (ii)  those  Trustees  who are not
"interested  persons" (as defined in the  Investment  Company Act of 1940) of us
and have no  direct or  indirect  financial  interest  in the  operation  of the
Shareholder  Servicing  Plan  adopted by us regarding  the  provision of support
services to the beneficial  owners of Fund Shares or in any  agreements  related
thereto ("Disinterested  Trustees"),  cast in person at a meeting called for the
purpose of voting on such approval.

                  Section 16. The  Declaration  of Trust  establishing  Northern
Institutional  Funds,  dated July 1, 1997,  a copy of which,  together  with all
amendments  thereto  (the  "Declaration"),  is on file with the Trust.  The name
"Northern  Institutional  Funds"  refers to the Trustees  under the  Declaration
collectively as Trustees, but not as individuals or personally;  and no Trustee,
shareholder,  officer,  employee or agent of Northern Institutional Funds, shall
be held to any  personal  liability,  nor shall  resort be had to their  private
property  for the  satisfaction  of any  obligation  or  claim or  otherwise  in
connection with the affairs of said Northern  Institutional Funds, but the Trust
Estate only shall be liable.

                  If you agree to be  legally  bound by the  provisions  of this
Agreement,  please sign a copy of this letter where indicated below and promptly
return it to [insert name and address].


                                              Very truly yours,


                                              NORTHERN INSTITUTIONAL FUNDS


Date:                                         By:
                                              Authorized Officer



                                              Accepted and Agreed to:



Date:                                         By:
                                              Authorized Officer


<PAGE>


                                   APPENDIX A

                  Please  check the  appropriate  boxes to indicate  the Class C
Shares of Northern  Institutional  Funds for which you wish to act as  Servicing
Agent:

                  [GRAPHIC OMITTED]15       Equity Index Portfolio


                  [GRAPHIC OMITTED]16       Small Company Index Portfolio


                  [GRAPHIC OMITTED]17       Diversified Growth Portfolio


                  [GRAPHIC OMITTED]18       Focused Growth Portfolio


                  [GRAPHIC OMITTED]19       U.S. Treasury Index Portfolio


                  [GRAPHIC OMITTED]20       U.S. Government Securities Portfolio


                  [GRAPHIC OMITTED]21       Short-Intermediate Bond Portfolio


                  [GRAPHIC OMITTED]22       Bond Portfolio


                  [GRAPHIC OMITTED]23       Intermediate Bond Portfolio


                  [GRAPHIC OMITTED]24       Balanced Portfolio


                  [GRAPHIC OMITTED]25       International Growth Portfolio


                  [GRAPHIC OMITTED]26       International Bond Portfolio


                  [GRAPHIC OMITTED]27       International Equity Index Portfolio


                  [GRAPHIC OMITTED]28       Global Asset Portfolio


                  [GRAPHIC OMITTED]29       Small Company Growth Portfolio


                  [GRAPHIC OMITTED]30       Mid Cap Growth Portfolio


                  [GRAPHIC OMITTED]31       MarketPower Portfolio


<PAGE>



                                                                        FORM

Northern Institutional Funds
(formerly, "The Benchmark Funds")
4900 Sears Tower
Chicago, Illinois 60606

                                                 SERVICING AGREEMENT
                                                 For Class D Shares

Gentlemen:

         We wish to enter into this Servicing  Agreement with you concerning the
provision  of  administrative  support  services  to  your  customers,  clients,
employees   and  others   ("Customers")   and  other   investors   ("Investors")
(collectively  "Clients") who may from time to time  beneficially  own shares of
beneficial interest in Class D of one or more of the portfolios which are listed
on Appendix A hereto  (collectively  the  "Funds,"  and  individually  a "Fund")
offered by Northern Institutional Funds ("Fund Shares").

         The terms and conditions of this Servicing Agreement are as follows:

                  Section 1. You agree to provide or arrange  for the  provision
of one or more of the  following  services  to Clients who may from time to time
beneficially own Fund Shares: (1) establishing and maintaining  separate account
records of  Customers  or other  Investors;  (2)  providing  Customers  or other
Investors  with a service that invests  their assets in Fund Shares  pursuant to
specific  or  pre-authorized  instructions,  and  assistance  with  new  account
applications;  (3) aggregating and processing  purchase and redemption  requests
for Fund Shares from  Customers  or other  Investors,  and placing  purchase and
redemption  orders  with  the  Transfer  Agent;  (4)  issuing  confirmations  to
Customers or other  Investors in accordance  with  applicable law; (5) arranging
for the timely  transmission  of funds  representing  the net purchase  price or
redemption proceeds;  (6) processing dividend payments on behalf of Customers or
other Investors;  (7) providing  information  periodically to Customers or other
Investors showing their positions in Fund Shares;  (8) responding to Customer or
other Investor inquiries  (including requests for prospectuses),  and complaints
relating to the services  performed by the  institutions;  (9) acting as liaison
with respect to all inquiries and complaints  from Customers and other Investors
relating  to errors  committed  by the Trust or its  agents,  and other  matters
pertaining  to the Trust;  (10)  providing  or arranging  for another  person to
provide  subaccounting  with  respect  to  Fund  Shares  beneficially  owned  by
Customers or other Investors;  (11) if required by law,  forwarding  shareholder
communications from the Trust (such as proxy statements and proxies, shareholder
reports, annual and semi-annual financial statements and dividend,  distribution
and tax notices) to Customers and other  Investors;  (12)  displaying and making
prospectuses available on an institution's  premises; (13) providing such office
space,  facilities  and  personnel  as may be  required to answer  questions  of
potential  investors and respond to inquiries of Customers and other  Investors;
(14) maintaining  appropriate management reporting and statistical  information;
(15)  paying  expenses  related  to the  preparation  of  educational  and other
explanatory  materials in connection with the development of investor  services;
(16) developing and monitoring investment programs; or (17) providing such other
similar  services  as  the  Trust  may  reasonably  request  to the  extent  the
Institutions are permitted to do so under applicable law, rules and regulations.

                  Section  2.  We  recognize  that  you  may be  subject  to the
provisions  of the  Glass-Steagall  Act and other laws  governing,  among  other
things,  the conduct of activities by Federally  chartered and supervised  banks
and other banking  organizations.  As such, you are restricted in the activities
you may undertake and for which you may be paid and, therefore, you will perform
only those  activities  which are consistent  with your statutory and regulatory
obligations.  You will act solely as agent  for,  upon the order of, and for the
account of, your Clients.

                  Section 3. In performing your duties hereunder,  you shall act
in conformity  with the then  effective  prospectus  and statement of additional
information  applicable to the Fund Shares,  the Investment  Company Act of 1940
and all other applicable  Federal and State banking,  securities and other laws,
regulations and rulings. You will assume sole responsibility for your compliance
with  applicable  Federal  and  State  laws  and  regulations,  and  shall  rely
exclusively upon your own  determination,  or that of your legal advisers,  that
the  performance  of  your  duties   hereunder   complies  with  such  laws  and
regulations. You shall perform your duties hereunder in a manner consistent with
the customs and practices of other financial  institutions  that provide similar
services.

                  Section 4. You will provide  such office space and  equipment,
telephone  facilities  and  personnel  (which  may be  any  part  of the  space,
equipment  and  facilities  currently  used in your  business,  or any personnel
employed  by you) as may be  reasonably  necessary  or  beneficial  in  order to
provide such services to Clients.

                  Section 5. Neither you nor any of your officers,  employees or
agents are authorized to make any  representations  concerning us or Fund Shares
except those contained in our then current prospectuses for such Shares,  copies
of which will be supplied by us to you, or in such  supplemental  literature  or
advertising as may be authorized by us in writing.

                  Section  6. For all  purposes  of this  Agreement  you will be
deemed to be an  independent  contractor,  and will have no  authority to act as
agent for us in any matter,  or in any respect.  By your written  acceptance  of
this Agreement, you agree to and do release, indemnify and hold us harmless from
and against any and all direct or indirect  liabilities or losses resulting from
requests,  directions,  actions  or  inactions  of or by you or  your  officers,
employees or agents regarding your  responsibilities  hereunder or the purchase,
redemption,  transfer or registration of Fund Shares by or on behalf of Clients.
You and your employees will upon request,  be available  during normal  business
hours to consult with us or our designees  concerning  the  performance  of your
responsibilities under this Agreement.

                  Section 7. In  consideration  of the services  and  facilities
provided by you or arranged by you to be provided hereunder, we will pay to you,
and you will accept as full payment  therefor,  a fee at the annual rate of .25%
of the average  daily net asset value of the Fund Shares  beneficially  owned by
your  Clients  for whom you are the dealer of record or holder of record or with
whom you have a servicing  relationship (the "Clients' Fund Shares"),  which fee
will be computed daily and payable monthly. For purposes of determining the fees
payable  under this Section 7, the average daily net asset value of the Clients'
Fund  Shares  will be  computed  in the  manner  specified  in our  registration
statement  (as the same is in effect from time to time) in  connection  with the
computation  of the net asset value of Fund Shares for purposes of purchases and
redemptions.  The fee  rate  stated  above  may be  prospectively  increased  or
decreased  by us,  in our sole  discretion,  at any  time  upon  notice  to you.
Further, we may, in our discretion,  and without notice, suspend or withdraw the
sale of Fund Shares, including the sale of such Shares to you for the account of
any Client or Clients.

                  Section 8. Any person  authorized to direct the disposition of
monies  paid or payable by us  pursuant to this  Agreement  will  provide to our
Board of Trustees,  and our Trustees will review, at least quarterly,  a written
report of the amounts so expended and the  purposes for which such  expenditures
were  made.  In  addition,  you  will  furnish  us or our  designees  with  such
information as we or they may reasonably request (including, without limitation,
periodic  certifications  confirming  the  provision  to Clients of the services
described  herein),  and  will  otherwise  cooperate  with us and our  designees
(including,  without  limitation,  any auditors designated by us), in connection
with the  preparation  of  reports  to our  Board of  Trustees  concerning  this
Agreement and the monies paid or payable by us pursuant  hereto,  as well as any
other  reports or filings that may be required by law.  You will be  responsible
for promptly reporting to us and our Board of Trustees any potential or existing
conflicts with respect to the investments of your Clients in the Funds.

                  Section  9.  We  may  enter  into  other   similar   Servicing
Agreements with any other person or persons without your consent.

                  Section 10. By your written acceptance of this Agreement,  you
represent,  warrant  and agree  that:  (i) in no event will any of the  services
provided by you  hereunder  be  primarily  intended to result in the sale of any
Fund  Shares  issued by us;  (ii) the  compensation  payable  to you  hereunder,
together  with any other  compensation  payable to you by Clients in  connection
with the  investment  of their assets in the Funds,  will be disclosed by you to
your  Clients,  will be  authorized  by your  Clients  and will not result in an
excessive or unreasonable  fee to you; (iii) in the event an issue pertaining to
this Agreement or our Shareholder Servicing Plan related hereto is submitted for
approval,  you will vote any Fund  Shares  held for your own account in the same
proportion  as the vote of the Fund Shares held for your Clients'  benefit;  and
(iv) you  will  not  engage  in  activities  pursuant  to this  Agreement  which
constitute acting as a broker or dealer under state law unless you have obtained
the licenses required by such law.

                  Section 11. This Agreement will become effective on the date a
fully executed copy of this Agreement is received by us or our designee.  Unless
sooner  terminated,  this  Agreement  will  continue  until April 30, 1999,  and
thereafter will continue  automatically  for successive annual periods ending on
April 30, provided such  continuance is specifically  approved at least annually
by  us in  the  manner  described  in  Section  15  hereof.  This  Agreement  is
terminable, without penalty, at any time by us (which termination may be by vote
of a majority of our Disinterested  Trustees as defined in Section 15 hereof) or
by you upon notice to the other party hereto.

                  Section 12. All notices and other communications to either you
or us will be duly  given if mailed,  telegraphed,  telexed  or  transmitted  by
similar telecommunications device to the appropriate address shown herein.

                  Section 13. This  Agreement  will be construed  in  accordance
with the laws of the State of  Illinois  and is  non-assignable  by the  parties
hereto.

                  Section  14. All persons  dealing  with us must look solely to
our  property  for the  enforcement  of any claims  against  us, as neither  our
Trustees,  officers,  agents nor shareholders  assume any personal liability for
obligations entered into on our behalf.

                  Section  15.  This  Agreement  has been  approved by vote of a
majority  of (i) our  Board of  Trustees  and (ii)  those  Trustees  who are not
"interested  persons" (as defined in the  Investment  Company Act of 1940) of us
and have no  direct or  indirect  financial  interest  in the  operation  of the
Shareholder  Servicing  Plan  adopted by us regarding  the  provision of support
services to the beneficial  owners of Fund Shares or in any  agreements  related
thereto ("Disinterested  Trustees"),  cast in person at a meeting called for the
purpose of voting on such approval.

                  Section 16. The  Declaration  of Trust  establishing  Northern
Institutional  Funds,  dated July 1, 1997,  a copy of which,  together  with all
amendments  thereto  (the  "Declaration"),  is on file with the Trust.  The name
"Northern  Institutional  Funds"  refers to the Trustees  under the  Declaration
collectively as Trustees, but not as individuals or personally;  and no Trustee,
shareholder,  officer,  employee or agent of Northern Institutional Funds, shall
be held to any  personal  liability,  nor shall  resort be had to their  private
property  for the  satisfaction  of any  obligation  or  claim or  otherwise  in
connection with the affairs of said Northern  Institutional Funds, but the Trust
Estate only shall be liable.

                  If you agree to be  legally  bound by the  provisions  of this
Agreement,  please sign a copy of this letter where indicated below and promptly
return it to [insert name and address].


                                          Very truly yours,


                                          NORTHERN INSTITUTIONAL FUNDS


Date:                                     By:
                                          Authorized Officer



                                          Accepted and Agreed to:



Date:                                     By:
                                          Authorized Officer


<PAGE>


                                   APPENDIX A

                  Please  check the  appropriate  boxes to indicate  the Class D
Shares of Northern  Institutional  Funds for which you wish to act as  Servicing
Agent:

                  [GRAPHIC OMITTED]29       Equity Index Portfolio


                  [GRAPHIC OMITTED]30       Small Company Index Portfolio


                  [GRAPHIC OMITTED]31       Diversified Growth Portfolio


                  [GRAPHIC OMITTED]32       Focused Growth Portfolio


                  [GRAPHIC OMITTED]33       U.S. Treasury Index Portfolio


                  [GRAPHIC OMITTED]34       U.S. Government Securities Portfolio


                  [GRAPHIC OMITTED]35       Short-Intermediate Bond Portfolio


                  [GRAPHIC OMITTED]36       Bond Portfolio


                  [GRAPHIC OMITTED]37       Intermediate Bond Portfolio


                  [GRAPHIC OMITTED]38       Balanced Portfolio


                  [GRAPHIC OMITTED]39       International Growth Portfolio


                  [GRAPHIC OMITTED]40       International Bond Portfolio


                  [GRAPHIC OMITTED]41       International Equity Index Portfolio


                  [GRAPHIC OMITTED]42       Global Asset Portfolio


                  [GRAPHIC OMITTED]43       Small Company Growth Portfolio


                  [GRAPHIC OMITTED]44       Mid Cap Growth Portfolio


                  [GRAPHIC OMITTED]45       MarketPower Portfolio


<PAGE>



                                                              Exhibit h(10)

                          NORTHERN INSTITUTIONAL FUNDS
                        (formerly, "The Benchmark Funds")

                       SERVICE PLAN FOR THE SERVICE CLASS
                              AND THE PREMIER CLASS

                                January 27, 1998


     WHEREAS,  Northern Institutional Funds (the "Trust") engages in business as
an open-end  management  investment  company and is registered as such under the
Investment Company Act of 1940, as amended (the "1940 Act");

     WHEREAS,  each of the  Trust's  money  market  investment  portfolios  (the
"Portfolios") are divided into three separate classes of shares: the Shares, the
Service Shares and the Premier Shares;

     WHEREAS,  the Trust, on behalf of the Service Shares and the Premier Shares
of each Portfolio,  desires to adopt a Service Plan and the Board of Trustees of
the Trust has determined that there is a reasonable  likelihood that adoption of
this Service Plan (the "Plan") will benefit the Trust and its shareholders; and

     WHEREAS,  institutions  (including The Northern Trust Company ("Northern"))
may act  directly or  indirectly  as nominees and  recordholders  of the Service
Shares and the Premier Shares of the Portfolios for their  respective  customers
who are or may  become  beneficial  owners  of such  shares  (the  "Customers"),
provide  service to other  institutions  intended to  facilitate or improve such
other  institutions'  services to their Customers and/or perform certain account
administration and shareholder  liaison services with respect to their Customers
pursuant to agreements under the Plan (the "Agreements").

     NOW, THEREFORE,  the Trust, on behalf of the Service Shares and the Premier
Shares of each  Portfolio,  hereby adopts this Plan on the  following  terms and
conditions:

         1. (a) The  Trust,  on behalf of the  Service  Shares  and the  Premier
Shares  of each  Portfolio,  is  authorized  to pay to  Northern  a  monthly  or
quarterly  service  fee  in  respect  of  (i)  administrative  support  services
performed and expenses  incurred in  connection  with such  Portfolio's  Service
Shares and Premier  Shares and (ii)  personal and account  maintenance  services
performed and expenses  incurred in  connection  with such  Portfolio's  Premier
Shares as set forth below.  The fee paid for such services  (the "Service  Fee")
during any one year shall not exceed:  (i) .33% of the  average  daily net asset
value of the Service Shares of such Portfolio and (ii) .58% of the average daily
net asset  value of the Premier  Shares of such  Portfolio  during such  period;
provided,  however,  that the fee  paid for  personal  and  account  maintenance
services and expenses shall not exceed .25% of the average daily net asset value
of such Shares of such Portfolio for such period.  Northern shall  determine the
amount of the  Service  Fee to be paid to one or more  brokers,  dealers,  other
financial institutions or other industry professionals  (collectively,  "Service
Agents")  and the  basis on which  such  payments  will be made.  Payments  to a
Service  Agent will be subject to compliance by the Service Agent with the terms
of the related Plan  agreement  entered into by the Service  Agent.  The Service
Fees  payable  pursuant  to this Plan shall not  pertain to services or expenses
which are primarily intended to result in the sale of Service Shares and Premier
Shares.

                  (b) Payments of the Service Fee with respect to Service Shares
and Premier  Shares shall be used to  compensate  or reimburse  Northern and the
Service  Agents for  administrative  support  services and  expenses,  which may
include without limitation: (i) acting or arranging for another party to act, as
recordholder  and nominee of Service  Shares and  Premier  Shares of a Portfolio
beneficially  owned by Customers;  (ii) establishing and maintaining  individual
accounts  and records  with  respect to Service  Shares and Premier  Shares of a
Portfolio  owned  by  Customers;  (iii)  processing  and  issuing  confirmations
concerning  Customer orders to purchase,  redeem and exchange Service Shares and
Premier  Shares  of  a  Portfolio;   (iv)  receiving  and   transmitting   funds
representing  the purchase  price or redemption  proceeds of Service  Shares and
Premier  Shares of a Portfolio;  (v) processing  dividend  payments on behalf of
Customers;  (vi) forwarding  shareholder  communications from the Trust (such as
proxy  statements  and  proxies,  shareholder  reports,  annual and  semi-annual
financial  statements  and  dividend,   distribution  and  tax  notices);  (vii)
providing such statistical and other information as may be reasonably  requested
by the Trust or  necessary  for the Trust to comply with  applicable  federal or
state law;  (viii)  facilitating  the  inclusion of a Portfolio  in  investment,
retirement,  asset  allocation,  cash  management  or sweep  accounts or similar
programs or services offered to their Customers or to Customers of other Service
Agents; (ix) facilitating  electronic or computer trading and/or processing in a
Portfolio to their  Customers or to Customers of other Service  Agents;  and (x)
performing any other similar administrative support services.

                  (c)  Payments of the  Service Fee with  respect to the Premier
Shares shall also be used to  compensate  or reimburse  Northern and the Service
Agents for personal and account  maintenance  services and  expenses,  which may
include,  without limitation:  (i) providing  facilities to answer inquiries and
respond to correspondence with Customers and other investors about the status of
their accounts or about other aspects of the Trust or the applicable  Portfolio;
(ii) assisting Customers in completing application forms, selecting dividend and
other account  options and opening  custody  accounts  with the Service  Agents;
(iii) providing services to Customers  intended to facilitate,  or improve their
understanding of the benefits and risks of, a Portfolio to Customers,  including
asset  allocation  and other similar  services;  (iv) acting as liaison  between
Customers  and the Trust,  including  obtaining  information  from the Trust and
assisting  the  Trust in  correcting  errors  and  resolving  problems;  and (v)
performing any similar personal and account maintenance services.

         2. This Plan shall not take effect as to any Portfolio  until the Plan,
together with any related  agreements,  has been approved for such  Portfolio by
votes of a majority of both (a) the Board of Trustees of the Trust and (b) those
Trustees of the Trust who are not "interested persons" of the Trust and who have
no direct or indirect  financial  interest in the  operation  of the Plan or any
agreements  related to it (the  "non-interested  Trustees")  cast in person at a
meeting  (or  meetings)  called  for the  purpose of voting on the Plan and such
related agreements.

         3. This Plan  shall  remain in effect  until  April 30,  1999 and shall
continue  in  effect  thereafter  so long as such  continuance  is  specifically
approved at least  annually in the manner  provided for approval of this Plan in
paragraph 2.

         4. The Trust's Board of Trustees shall receive,  and the Trustees shall
review,  at least  quarterly,  a written  report on the Service Fees paid by the
Service  Shares and Premier  Shares of the Portfolios and the purposes for which
those expenditures were made.

         5.       This Plan may be terminated as to the Service Shares and
the Premier Shares of any Portfolio at any time by vote of a majority of the
non-interested Trustees.

         6. This Plan may not be amended to  increase  materially  the amount of
compensation  payable  pursuant to paragraph 1 hereof  unless such  amendment is
approved in the manner provided for initial  approval in paragraph 2 hereof.  No
material  amendment  to the Plan  shall be made  unless  approved  in the manner
provided in paragraph 2 hereof.

         7. While this Plan is in effect,  the selection  and  nomination of the
non-interested Trustees of the Trust shall be committed to the discretion of the
non-interested Trustees.

         8. The Trust  shall  preserve  copies  of this  Plan,  and any  related
agreements and all reports made pursuant to paragraph 4 hereof,  for a period of
not less than six years  from the date of the Plan,  any such  agreement  or any
such  report,  as the case may be,  the first two years in an easily  accessible
place.

         IN WITNESS  WHEREOF,  the Trust,  on behalf of the  Service  Shares and
Premier Shares of each  Portfolio,  has executed this Service Plan as of the day
and year first written above.


                                                  NORTHERN INSTITUTIONAL FUNDS



                                                  By:  /s/Michael J. Richman
                                                        Michael J. Richman
                                                        Secretary of the Trust


<PAGE>


                                                      The Northern Trust Company
                                                         50 South LaSalle Street
                                                               Chicago, IL 60675

Date

Service Agent
Address



     RE: Northern  Institutional  Funds (formerly,  "The Benchmark  Funds") (the
"Trust")/ Service Shares

Gentlemen:

The Trust is an open-end  management  investment company that includes the money
market investment portfolios (the "Portfolios") identified on Schedule A hereto.
Shares of each Portfolio are divided into three separate classes,  including the
Service Shares.

You are a bank, a trust  company or other  financial  institution  (the "Service
Agent") with  customers who are or may become the  beneficial  owners of Service
Shares of the Portfolios (the  "Customers").  You are willing to perform certain
services  with  respect to the  Customers  investing  in  Service  Shares of the
Portfolios  that you have selected on Schedule A attached  hereto.  In addition,
you may wish to offer to your  Customers  an  automated  cash  management  sweep
program (hereinafter the "Program") under which funds in the Customers' accounts
over  a  specified   minimum  amount  will  be  "swept"   (i.e.,   automatically
transmitted) on a daily basis into Service Shares of one or more Portfolios.
Accordingly, the Service Agent and The Northern Trust Company ("Northern") agree
as follows:

         1. With respect to Customers who beneficially  own Service Shares,  the
Service  Agent hereby  agrees to perform the  following  administrative  support
services7:  (a)  establish  and  maintain  individual  accounts and records with
respect  to  Service  Shares  owned by each  Customer;  (b)  process  and  issue
confirmations concerning Customer orders to purchase, redeem and exchange shares
promptly  and in  accordance  with the  then-effective  prospectus  for  Service
Shares;  (c) receive and  transmit  funds  representing  the  purchase  price or
redemption  proceeds of Service Shares;  (d) process dividend payments on behalf
of Customers; (e) forward to Customers shareholder communications from the Trust
(such  as  proxy  statements  and  proxies,   shareholder  reports,  annual  and
semi-annual  financial  statements and dividend,  distribution and tax notices);
and (f) provide such  statistical  and other  information  as may be  reasonably
requested  by the Trust or  necessary  for the Trust to comply  with  applicable
federal or state laws.

         2.1 The Service Agent may  establish a Program for its  Customers  upon
such  terms  and  conditions  (including  the  types  of  accounts  eligible  to
participate in such a Program;  the minimum account balances over which funds in
such accounts will be swept into Service Shares;  the minimum excess balances in
such  accounts,  if any,  which will be swept;  and the  frequency  of sweeps of
excess  account  balances)  as the Service  Agent shall  determine.  No Customer
account  shall be  permitted  to  participate  in the  Program  except  upon the
execution by the Customer of (a) an account opening agreement, (b) authorization
for the  Service  Agent  to  effect  the  sweep of  funds  in such  accounts  in
accordance  with the terms of the Program,  and (c) all necessary  Trust account
application forms.

         2.2 The Service Agent will be responsible  for providing all electronic
data  processing  facilities  as shall be necessary to establish and operate the
Program,  and for the proper transmission of funds and appropriate  instructions
to the Trust.  The procedures for the purchase and redemption of Service Shares,
including  all relevant  time and  notification  requirements,  specified in the
then-effective  prospectus of the Service Shares,  shall govern the purchase and
redemption of Service Shares for the accounts of Service Agent  Customers  under
this Agreement, including the purchase and redemption of Service Shares pursuant
to the Program.

         2.3  The  Service  Agent  will  have   exclusive   responsibility   for
establishing   and  operating  the  Program  for  its  Customers.   The  Trust's
responsibilities  with  respect  to the  Program  shall be limited to the proper
handling of "swept" funds properly  transmitted  by the Service  Agent,  and the
proper   implementation  of  Customer  and  Service  Agent  share  purchase  and
redemption instructions.  The Service Agent agrees that the Trust and its agents
shall have no  responsibility  or liability to review any purchase or redemption
request  which is  presented  by the Service  Agent to  determine  whether  such
request is genuine or authorized by the Customer of the Service Agent. The Trust
and its  agents  shall be  entitled  to rely  conclusively  on any  purchase  or
redemption  request  communicated  by the  Service  Agent,  and  shall  have  no
liability whatsoever for any losses, claims or damages to or against the Service
Agent or any Customer  resulting from a failure of the Service Agent to transmit
any such request, or from any errors contained in any request.

         3. The  Service  Agent shall  furnish  such  office  space,  equipment,
facilities,  computer  hardware and  software,  and personnel as is necessary to
perform its duties hereunder. The Service Agent shall bear all costs incurred by
it in performing such duties.

         4. For the services  provided and the expenses  incurred by the Service
Agent  hereunder,  Northern on behalf of each  Portfolio will pay to the Service
Agent a monthly fee equal on an annual  basis to .25% of the  average  daily net
asset value of the Service Shares of such Portfolio which are owned beneficially
by Customers  through the Service Agent during such period. If the total fees to
be  accrued by a  Portfolio  on any day with  respect to Service  Shares of such
Portfolio  exceed the net income,  exclusive of such fees, to be accrued by such
Portfolio on Service  Shares,  the fee payable to the Service Agent with respect
to such  Portfolio on such day will be reduced by an amount equal to the Service
Agent's  proportionate  share of such excess with respect to Service Shares,  in
order to avoid adversely affecting the net asset value per share of such class.

         5.1 In  effecting  the  purchase  or  redemption  of Service  Shares in
accordance  with the  provisions of the Program or otherwise,  the Service Agent
represents  as follows:  (a) it shall act solely as agent or  fiduciary  for the
account of its Customer;  (b) each  purchase or redemption of Service  Shares on
behalf of its Customer shall be initiated  solely upon the instruction and order
of the Customer or pursuant to the Service Agent's proper exercise of investment
discretion;  and (c) the  Customer  will have full  beneficial  ownership of any
Service  Shares   purchased  upon  its   authorization   and  order.   Under  no
circumstances will the Service Agent make any oral or written representations to
the contrary.

         5.2 In performing its duties  hereunder,  the Service Agent will act in
conformity  with the  then-effective  prospectuses  and statements of additional
information of the Service Shares for the Portfolios selected on Schedule A, the
Investment Company Act of 1940 (the "1940 Act") and all other applicable federal
and state banking,  securities and other laws,  regulations  and rulings and the
constitution, by-laws, and rules of any applicable self-regulatory organization.
The Service  Agent will  assume  sole  responsibility  for its  compliance  with
applicable  federal and state laws and  regulations,  and shall rely exclusively
upon its own determination,  or that of its legal advisers, that the performance
of its  duties  hereunder  complies  with  such laws and  regulations.  Under no
circumstances  shall the  Trust,  Northern  or any of their  affiliates  be held
responsible or liable in any respect for any statements or representations  made
by them or their  legal  advisers to the  Service  Agent or any  Customer of the
Service  Agent  concerning  the  applicability  of any  federal or state laws or
regulations to the activities  described herein. The Service Agent shall perform
its duties  hereunder in a manner  consistent  with the customs and practices of
other financial institutions that provide similar services.

         5.3  Representations  and Warranties.  The Service Agent represents and
warrants that:

         (a)      it is duly  organized,  validly  existing and in good standing
                  under the laws of the  jurisdiction of its  organization,  and
                  that its execution of this Agreement and provision of services
                  hereunder  has been duly  authorized  and will not violate (i)
                  its  charter  documents  or by-laws,  (ii) any laws,  rules or
                  regulations,  or (iii)  any other  agreement  to which it is a
                  party;

          (b)  it will not engage in activities pursuant to this Agreement which
               constitute acting as a broker or dealer under state law unless it
               has obtained the licenses required by such law; and

         (c)      it will keep confidential any information acquired as a result
                  of this  Agreement  regarding  the business and affairs of the
                  Trust and Northern,  which requirements shall survive the term
                  of this Agreement.

         5.4 In  addition  to  the  foregoing,  with  respect  to the  purchase,
redemption or exchange of Service  Shares for Customer  accounts with respect to
which  the  Service  Agent  is a  fiduciary  under  state  or  federal  trust or
comparable  fiduciary  requirements,  or, in the case of any such accounts which
are subject to the Employee  Retirement Income Security Act of 1974, as amended,
the  Service  Agent is a  fiduciary  or party in  interest,  the  Service  Agent
represents that the purchase,  redemption or exchange of Service Shares, and the
Service Agent's receipt of the relevant fee described in paragraph 4 hereof,  is
permissible  under  all  such  applicable  requirements  and  complies  with any
restrictions, limitations or procedures under such requirements.

         6.1 This  Agreement  shall  become  effective  on the date  hereof and,
unless  sooner  terminated,  shall  continue in effect until the April 30 of the
next year  following the year in which this  Agreement  becomes  effective,  and
thereafter shall continue  automatically for successive annual periods ending on
April 30,  provided that it is approved  annually by a vote of a majority of the
Trustees  of the Trust,  including  a  majority  of those  Trustees  who are not
"interested  persons"  of the Trust (as defined in the 1940 Act) and who have no
direct or indirect  financial  interest in the operation of the Service Plan for
the  Service  Class  and  the  Premier  Class,  this  Agreement  or any  related
agreements (the  "Independent  Trustees") cast in person at a meeting called for
the purpose of voting on this Agreement. This Agreement may be terminated at any
time,  on not less than 60 days'  notice to the  Service  Agent and  without the
payment of any penalty by  Northern or by vote of a majority of the  Independent
Trustees. This Agreement may also be terminated by the Service Agent at any time
on 60 days' notice to Northern and will terminate  automatically in the event of
its assignment. All material amendments to this Agreement must be in writing and
must be approved by the Independent  Trustees in the manner  described above for
continuing this Agreement. The term "assignment" shall have the meaning given to
it in the 1940 Act. Any notice furnished hereunder shall be in writing and shall
be mailed or delivered to the other party at its address set forth above.

         6.2 The Service  Agent agrees to  indemnify  Northern and the Trust and
each person who  controls  (as  defined in Section  2(a)(9) of the 1940 Act) the
Trust from and against any losses, claims, damages, expenses (including fees and
expenses of counsel) or liabilities  ("Damages") to which Northern, the Trust or
such  person  may  become  subject  in so far as such  Damages  arise out of the
failure of the Service  Agent or its  employees,  agents or  Customers to comply
with the Service Agent's  obligations under this Agreement.  Notwithstanding the
foregoing,  neither  Northern nor the Trust shall be entitled to be  indemnified
for Damages  arising out of its or its agent's or employee's  gross  negligence.
The  foregoing  indemnity  agreement  shall be in addition to any  liability the
Service Agent may otherwise have.

         7. The Service  Agent shall be deemed to be an  independent  contractor
and not an agent of Northern or the Trust for all purposes  hereunder  and shall
have no authority to act for or represent Northern or the Trust. In addition, no
officer or employee  of the  Service  Agent shall be deemed to be an employee or
agent of the Trust or  Northern,  nor will be subject,  in any  respect,  to the
supervision of Northern or any affiliate thereof.  Neither the Service Agent nor
any  of  its  officers,   employees  or  agents  are   authorized  to  make  any
representations concerning the Trust or Service Shares except those contained in
the Trust's then-current  prospectuses and statements of additional  information
for Service Shares or in such  supplemental  literature or advertising as may be
authorized by the Trust.  The fees payable to the Service Agent pursuant to this
Agreement shall not pertain to services or expenses which are primarily intended
to result in the sale of Service Shares.

         8.       This Agreement has been approved by vote of a majority of
(i) the Board of Trustees and (ii) the Independent Trustees  cast in person at
a meeting called for
the purpose of voting on such approval.

         9. The Declaration of Trust establishing Northern  Institutional Funds,
dated July 1, 1997, together with all amendments thereto (the "Declaration"), is
on file with the Trust.  The name "Northern  Institutional  Funds" refers to the
Trustees under the Declaration  collectively as Trustees, but not as individuals
or personally;  and the obligations of the Trust or a Portfolio or class thereof
are not binding upon any of the Trustees, officers or shareholders individually,
but bind only the Trust Property of the  applicable  Portfolio or class thereof.
Only the Service Shares of a particular  Portfolio  shall be responsible for the
fees payable hereunder with respect to such Shares.

         10. If any provision of this Agreement shall be held or made invalid by
a  decision  in a  judicial  or  administrative  proceeding,  statute,  rule  or
otherwise,  the  enforceability  of the remainder of this  Agreement will not be
impaired  thereby.  This  Agreement  shall be  governed  by the laws of Illinois
(except  with  respect to  paragraph  9, which will be  governed  by the laws of
Delaware)  and shall be binding  upon and inure to the  benefit  of the  parties
hereto and their respective successors.

                                                Very truly yours,

                                                THE NORTHERN TRUST COMPANY


                                                By:_________________________
                                                   [Authorized Officer]

Accepted and agreed to as of the date first above written:

SERVICE AGENT


By:_________________________
         [Authorized Officer]


<PAGE>


                                                     SCHEDULE A




Please indicate (_) the appropriate Portfolios to which this Agreement applies:


                                              Service
             Portfolio                        Shares
Government Select
Government
Diversified Assets
Tax-Exempt
Municipal



<PAGE>


                                                      The Northern Trust Company
                                                         50 South LaSalle Street
                                                               Chicago, IL 60675

Date

Service Agent
Address


     RE: Northern  Institutional  Funds (formerly,  "The Benchmark  Funds") (the
"Trust")/ Premier Shares

Gentlemen:

The Trust is an open-end  management  investment company that includes the money
market investment portfolios (the "Portfolios") identified on Schedule A hereto.
Shares of each Portfolio are divided into three separate classes,  including the
Premier Shares.

You are a bank, a trust  company or other  financial  institution  (the "Service
Agent") with  customers who are or may become the  beneficial  owners of Premier
Shares of the Portfolios (the  "Customers").  You are willing to perform certain
services  with respect to the Customers  investing in the Premier  Shares of the
Portfolios  that you have selected on Schedule A attached  hereto.  In addition,
you may wish to offer to your  Customers  an  automated  cash  management  sweep
program (hereinafter the "Program") under which funds in the Customers' accounts
over  a  specified   minimum  amount  will  be  "swept"   (i.e.,   automatically
transmitted)  on  a  daily  basis  into  shares  of  one  or  more   Portfolios.
Accordingly, the Service Agent and The Northern Trust Company ("Northern") agree
as follows:

         1. With respect to Customers who beneficially  own Premier Shares,  the
Service  Agent hereby  agrees to perform the  following  administrative  support
services8:  (a)  establish  and  maintain  individual  accounts and records with
respect  to  Premier  Shares  owned by each  Customer;  (b)  process  and  issue
confirmations concerning Customer orders to purchase, redeem and exchange shares
promptly  and in  accordance  with the  then-effective  prospectus  for  Premier
Shares;  (c) receive and  transmit  funds  representing  the  purchase  price or
redemption  proceeds of Premier Shares;  (d) process dividend payments on behalf
of Customers; (e) forward to Customers shareholder communications from the Trust
(such  as  proxy  statements  and  proxies,   shareholder  reports,  annual  and
semi-annual  financial  statements and dividend,  distribution and tax notices);
and (f) provide such  statistical  and other  information  as may be  reasonably
requested  by the Trust or  necessary  for the Trust to comply  with  applicable
federal or state laws.  With respect to Customers who  beneficially  own Premier
Shares,  the Service Agent hereby  agrees to perform the following  personal and
account  maintenance  services:  (a) provide  facilities to answer inquiries and
respond to correspondence with Customers and other investors about the status of
their accounts or about other aspects of the Trust or the applicable  Portfolio;
(b) assist Customers in completing  application  forms,  selecting  dividend and
other account options and opening custody accounts with the Service Agents;  (c)
provide  services  to  Customers  intended  to  facilitate,   or  improve  their
understanding of the benefits and risks of, a Portfolio to Customers,  including
asset  allocation  and  other  similar  services;  (d)  act as  liaison  between
Customers  and the Trust,  including  obtaining  information  from the Trust and
assisting the Trust in correcting errors and resolving problems; and (e) perform
any similar personal and account maintenance services.

         2.1 The Service Agent may  establish a Program for its  Customers  upon
such  terms  and  conditions  (including  the  types  of  accounts  eligible  to
participate in such a Program;  the minimum account balances over which funds in
such accounts will be swept into Premier Shares;  the minimum excess balances in
such  accounts,  if any,  which will be swept;  and the  frequency  of sweeps of
excess  account  balances)  as the Service  Agent shall  determine.  No Customer
account  shall be  permitted  to  participate  in the  Program  except  upon the
execution by the Customer of (a) an account opening agreement, (b) authorization
for the  Service  Agent  to  effect  the  sweep of  funds  in such  accounts  in
accordance  with the terms of the Program,  and (c) all necessary  Trust account
application forms.

         2.2 The Service Agent will be responsible  for providing all electronic
data  processing  facilities  as shall be necessary to establish and operate the
Program,  and for the proper transmission of funds and appropriate  instructions
to the Trust.  The procedures for the purchase and redemption of Premier Shares,
including  all relevant  time and  notification  requirements,  specified in the
then-effective  prospectus of the Premier Shares,  shall govern the purchase and
redemption of Premier Shares for the accounts of Service Agent  Customers  under
this Agreement, including the purchase and redemption of Premier Shares pursuant
to the Program.

         2.3  The  Service  Agent  will  have   exclusive   responsibility   for
establishing   and  operating  the  Program  for  its  Customers.   The  Trust's
responsibilities  with  respect  to the  Program  shall be limited to the proper
handling of "swept" funds properly  transmitted  by the Service  Agent,  and the
proper   implementation  of  Customer  and  Service  Agent  share  purchase  and
redemption instructions.  The Service Agent agrees that the Trust and its agents
shall have no  responsibility  or liability to review any purchase or redemption
request  which is  presented  by the Service  Agent to  determine  whether  such
request is genuine or authorized by the Customer of the Service Agent. The Trust
and its  agents  shall be  entitled  to rely  conclusively  on any  purchase  or
redemption  request  communicated  by the  Service  Agent,  and  shall  have  no
liability whatsoever for any losses, claims or damages to or against the Service
Agent or any Customer  resulting from a failure of the Service Agent to transmit
any such request, or from any errors contained in any request.

         3. The  Service  Agent shall  furnish  such  office  space,  equipment,
facilities,  computer  hardware and  software,  and personnel as is necessary to
perform its duties hereunder. The Service Agent shall bear all costs incurred by
it in performing such duties.

         4. For the services  provided and the expenses  incurred by the Service
Agent  hereunder,  Northern on behalf of each  Portfolio will pay to the Service
Agent a monthly fee equal on an annual  basis to .50% of the  average  daily net
asset value of the Premier Shares of such Portfolio which are owned beneficially
by Customers  through the Service  Agent during such period.  Of these fees,  no
more than half of the fee  payable  with  respect to Premier  Shares will be for
personal and account maintenance services and expenses.  If the total fees to be
accrued  by a  Portfolio  on any day with  respect  to  Premier  Shares  of such
Portfolio  exceed the net income,  exclusive of such fees, to be accrued by such
Portfolio on Premier  Shares,  the fee payable to the Service Agent with respect
to such  Portfolio on such day will be reduced by an amount equal to the Service
Agent's  proportionate  share of such excess with respect to Premier Shares,  in
order to avoid adversely affecting the net asset value per share of such class.

         5.1 In  effecting  the  purchase  or  redemption  of Premier  Shares in
accordance  with the  provisions of the Program or otherwise,  the Service Agent
represents  as follows:  (a) it shall act solely as agent or  fiduciary  for the
account of its Customer;  (b) each  purchase or redemption of Premier  Shares on
behalf of its Customer shall be initiated  solely upon the instruction and order
of the Customer or pursuant to the Service Agent's proper exercise of investment
discretion;  and (c) the  Customer  will have full  beneficial  ownership of any
Premier  Shares   purchased  upon  its   authorization   and  order.   Under  no
circumstances will the Service Agent make any oral or written representations to
the contrary.

         5.2 In performing its duties  hereunder,  the Service Agent will act in
conformity  with the  then-effective  prospectuses  and statements of additional
information of the Premier Shares for the Portfolios selected on Schedule A, the
Investment Company Act of 1940 (the "1940 Act") and all other applicable federal
and state banking,  securities and other laws,  regulations  and rulings and the
constitution, by-laws, and rules of any applicable self-regulatory organization.
The Service  Agent will  assume  sole  responsibility  for its  compliance  with
applicable  federal and state laws and  regulations,  and shall rely exclusively
upon its own determination,  or that of its legal advisers, that the performance
of its  duties  hereunder  complies  with  such laws and  regulations.  Under no
circumstances  shall the  Trust,  Northern  or any of their  affiliates  be held
responsible or liable in any respect for any statements or representations  made
by them or their  legal  advisers to the  Service  Agent or any  Customer of the
Service  Agent  concerning  the  applicability  of any  federal or state laws or
regulations to the activities  described herein. The Service Agent shall perform
its duties  hereunder in a manner  consistent  with the customs and practices of
other financial institutions that provide similar services.

         5.3  Representations  and Warranties.  The Service Agent represents and
warrants that:

         (a)      it is duly  organized,  validly  existing and in good standing
                  under the laws of the  jurisdiction of its  organization,  and
                  that its execution of this Agreement and provision of services
                  hereunder  has been duly  authorized  and will not violate (i)
                  its  charter  documents  or by-laws,  (ii) any laws,  rules or
                  regulations,  or (iii)  any other  agreement  to which it is a
                  party;

         (b)      it will not engage in activities pursuant to this Agreement
                    which constitute acting as a broker or dealer under state
                    law unless it has obtained the licenses required by such
                     law; and

         (c)      it will keep confidential any information acquired as a result
                  of this  Agreement  regarding  the business and affairs of the
                  Trust and Northern,  which requirements shall survive the term
                  of this Agreement.

         5.4 In  addition  to  the  foregoing,  with  respect  to the  purchase,
redemption or exchange of Premier  Shares for Customer  accounts with respect to
which  the  Service  Agent  is a  fiduciary  under  state  or  federal  trust or
comparable  fiduciary  requirements,  or, in the case of any such accounts which
are subject to the Employee  Retirement Income Security Act of 1974, as amended,
the  Service  Agent is a  fiduciary  or party in  interest,  the  Service  Agent
represents that the purchase,  redemption or exchange of Premier Shares, and the
Service Agent's receipt of the relevant fee described in paragraph 4 hereof,  is
permissible  under  all  such  applicable  requirements  and  complies  with any
restrictions, limitations or procedures under such requirements.

         6.1 This  Agreement  shall  become  effective  on the date  hereof and,
unless  sooner  terminated,  shall  continue in effect until the April 30 of the
next year  following the year in which this  Agreement  becomes  effective,  and
thereafter shall continue  automatically for successive annual periods ending on
April 30,  provided that it is approved  annually by a vote of a majority of the
Trustees  of the Trust,  including  a  majority  of those  Trustees  who are not
"interested  persons"  of the Trust (as defined in the 1940 Act) and who have no
direct or indirect  financial  interest in the operation of the Service Plan for
the  Service  Class  and  the  Premier  Class,  this  Agreement  or any  related
agreements (the  "Independent  Trustees") cast in person at a meeting called for
the purpose of voting on this Agreement. This Agreement may be terminated at any
time,  on not less than 60 days'  notice to the  Service  Agent and  without the
payment of any penalty by  Northern or by vote of a majority of the  Independent
Trustees. This Agreement may also be terminated by the Service Agent at any time
on 60 days' notice to Northern and will terminate  automatically in the event of
its assignment. All material amendments to this Agreement must be in writing and
must be approved by the Independent  Trustees in the manner  described above for
continuing this Agreement. The term "assignment" shall have the meaning given to
it in the 1940 Act. Any notice furnished hereunder shall be in writing and shall
be mailed or delivered to the other party at its address set forth above.

         6.2 The Service  Agent agrees to  indemnify  Northern and the Trust and
each person who  controls  (as  defined in Section  2(a)(9) of the 1940 Act) the
Trust from and against any losses, claims, damages, expenses (including fees and
expenses of counsel) or liabilities  ("Damages") to which Northern, the Trust or
such  person  may  become  subject  in so far as such  Damages  arise out of the
failure of the Service  Agent or its  employees,  agents or  Customers to comply
with the Service Agent's  obligations under this Agreement.  Notwithstanding the
foregoing,  neither  Northern nor the Trust shall be entitled to be  indemnified
for Damages  arising out of its or its agent's or employee's  gross  negligence.
The  foregoing  indemnity  agreement  shall be in addition to any  liability the
Service Agent may otherwise have.

         7. The Service  Agent shall be deemed to be an  independent  contractor
and not an agent of Northern or the Trust for all purposes  hereunder  and shall
have no authority to act for or represent Northern or the Trust. In addition, no
officer or employee  of the  Service  Agent shall be deemed to be an employee or
agent of the Trust or  Northern,  nor will be subject,  in any  respect,  to the
supervision of Northern or any affiliate thereof.  Neither the Service Agent nor
any  of  its  officers,   employees  or  agents  are   authorized  to  make  any
representations concerning the Trust or Premier Shares except those contained in
the Trust's then-current  prospectuses and statements of additional  information
for Premier Shares or in such  supplemental  literature or advertising as may be
authorized by the Trust.  The fees payable to the Service Agent pursuant to this
Agreement shall not pertain to services or expenses which are primarily intended
to result in the sale of Premier Shares.

         8.       This Agreement has been approved by vote of a majority of (i)
the Board of Trustees and (ii) the Independent Trustees  cast in person at a
meeting called for the purpose of voting on such approval.

         9. The Declaration of Trust establishing Northern  Institutional Funds,
dated July 1, 1997, together with all amendments thereto (the "Declaration"), is
on file with the Trust.  The name "Northern  Institutional  Funds" refers to the
Trustees under the Declaration  collectively as Trustees, but not as individuals
or personally;  and the obligations of the Trust or a Portfolio or class thereof
are not binding upon any of the Trustees, officers or shareholders individually,
but bind only the Trust Property of the  applicable  Portfolio or class thereof.
Only the Premier Shares of a particular  Portfolio  shall be responsible for the
fees payable hereunder with respect to such Shares.

         10. If any provision of this Agreement shall be held or made invalid by
a  decision  in a  judicial  or  administrative  proceeding,  statute,  rule  or
otherwise,  the  enforceability  of the remainder of this  Agreement will not be
impaired  thereby.  This  Agreement  shall be  governed  by the laws of Illinois
(except  with  respect to  paragraph  9, which will be  governed  by the laws of
Delaware)  and shall be binding  upon and inure to the  benefit  of the  parties
hereto and their respective successors.

                                                     Very truly yours,

                                                     THE NORTHERN TRUST COMPANY


                                                    By:_________________________
                                                           [Authorized Officer]

Accepted and agreed to as of the date first above written:

SERVICE AGENT

By:_________________________
         [Authorized Officer]


<PAGE>


                                                     SCHEDULE A




Please indicate (_) the appropriate Portfolios to which this Agreement applies:


                                              Premier
             Portfolio                        Shares
Government Select
Government
Diversified Assets
Tax-Exempt
Municipal


                                                              Exhibit h(11)

                              AMENDED AND RESTATED
                           CO-ADMINISTRATION AGREEMENT


         THIS   AMENDED   AND   RESTATED   CO-ADMINISTRATION    AGREEMENT   (the
"Agreement"),  dated as of this  fifth  day of  October,  1999  (the  "Effective
Date"),  by and among  FIRST  DATA  INVESTOR  SERVICES  GROUP,  INC.  ("Investor
Services  Group"),  a  Massachusetts  corporation,  THE NORTHERN  TRUST  COMPANY
("Northern"),   an   Illinois   state  bank  (each  a   "Co-Administrator"   and
collectively,  the  "Co-Administrators"),  and NORTHERN INSTITUTIONAL FUNDS (the
"Fund"), a Delaware business trust.

         WHEREAS,  the Fund is registered as an open-end  management  investment
company under the Investment  Company Act of 1940, as amended (the " 1940 Act");
and

         WHEREAS,  the Fund  desires to retain the  Co-Administrators  to render
certain administrative services with respect to each investment portfolio listed
in  Schedule  A  hereto,  as the same may be  amended  from  time to time by the
parties hereto (collectively,  the "Portfolios"),  and the Co-Administrators are
willing to render such services.

                                   WITNESSETH:

         NOW,  THEREFORE,  in consideration of the premises and mutual covenants
set forth herein and intending to be legally bound  hereby,  the parties  hereto
agree as follows:

Article 1         Definitions.

         Whenever  used in this  Agreement,  the  following  words and  phrases,
unless the context otherwise requires, shall have the following meanings:

     (a)  "Advisory  Agreement"  shall mean the  Investment  Advisory  Agreement
between the Fund and Northern  dated March 31, 1998,  as currently in effect and
as amended and/or superseded from time to time.

     (b) "Articles of  Incorporation"  shall mean the Articles of Incorporation,
Declaration of Trust, or other similar  organizational  document as the case may
be, of a party as the same may be amended from time to time.

     (c) "Assign"  and  "Assignment"  shall have the same meaning  herein as the
term "assignment" has in the 1940 Act.

     (d) "Authorized  Person" shall be deemed to include (i) any Board Member or
officer  of the  Fund;  or (ii) any  person,  whether  or not such  person is an
officer or employee of the Fund,  duly  authorized to give Oral  Instructions or
Written  Instructions  on  behalf  of the  Fund as  indicated  in  writing  to a
Co-Administrator from time to time.

     (e) "Board  Members"  shall mean the Directors or Trustees of the governing
body of the Fund, as the case may be.

     (f)  "Board of  Directors"  shall mean the Board of  Directors  or Board of
Trustees of the Fund, as the case may be.

     (g) "By-Laws"  shall mean the By-Laws of a party as the same may be amended
from time to time.

     (h) "Commission" shall mean the Securities and Exchange Commission.

     (i)  "Custodian"  refers to any custodian or subcustodian of securities and
other  property,  which the Fund may from time to time  deposit,  or cause to be
deposited  or held under the name or account of such a  custodian  pursuant to a
custody agreement.

     (j) "1933  Act"  shall  mean the  Securities  Act of 1933 and the rules and
regulations promulgated thereunder, all as amended from time to time.

     (k) "1940 Act" shall mean the Investment  Company Act of 1940 and the rules
and regulations promulgated thereunder, all as amended from time to time.

     (l)  "Oral  Instructions"  shall  mean  instructions,  other  than  Written
Instructions,  actually received by a Co-Administrator  from a person reasonably
believed by a Co-Administrator to be an Authorized Person.

     (m) "Prospectus"  shall mean the most recently dated Fund  Prospectuses and
Statements of Additional Information,  including any supplements thereto if any,
which has become effective under the 1933 Act and the 1940 Act.

     (n)  "Shares"  refers  collectively  to such  shares  of  capital  stock or
beneficial  interest,  as the case may be, or class thereof,  of each respective
Portfolio of the Fund as may be issued from time to time.

     (o) "Written  Instructions" shall mean a written  communication signed by a
person reasonably  believed by a Co-Administrator to be an Authorized Person and
actually  received by a  Co-Administrator.  Written  Instructions  shall include
manually executed originals and authorized electronic  transmissions,  including
telefacsimile of a manually executed original or other process.

Article 2         Appointment of the Co-Administrators.

         The Fund hereby appoints Northern and Investor Services Group to act as
Co-Administrators  of the Fund for the period and on the terms set forth in this
Agreement.  Northern and Investor  Services  Group accept such  appointment  and
agree to render  the  services  herein  set forth  for the  compensation  herein
provided. This Agreement shall be effective and binding on the parties hereto as
of the Effective Date.

Article 3         Duties of the Co-Administrators.

     3.1  Subject to the  general  supervision  of the Board of  Directors,  the
Co-Administrators  shall  provide  supervision  of all  aspects  of  the  Fund's
operations  (other than those  referred  to in  paragraph  3(a) of the  Advisory
Agreement) and perform the customary services of an administrator, including but
not limited to the  corporate  secretarial,  treasury  and blue sky services set
forth in Schedule B to this Agreement.

     3.2 In performing their duties under this Agreement, the Co-Administrators:
(a)  will  act in  accordance  with  the  Articles  of  Incorporation,  By-Laws,
Prospectus and with the Oral  Instructions and Written  Instructions of the Fund
and will  conform to and comply  with the  requirements  of the 1940 Act and all
other  applicable  federal or state laws and  regulations;  and (b) will consult
with legal counsel to the Fund, as necessary and appropriate.  Furthermore,  the
Co-Administrators  shall  not  have or be  required  to have  any  authority  to
supervise the investment or reinvestment  of the securities or other  properties
which  comprise  the assets of the Fund or any of its  Portfolios  and shall not
provide any  investment  advisory  services to the Fund or any of its Portfolios
under this Agreement.

     3.3 In addition to the duties set forth herein, the Co-Administrators shall
perform  such  other  duties  and  functions,  and  shall be paid  such  amounts
therefor,  as may from time to time be agreed  upon in writing  between the Fund
and the Co-Administrators.

     3.4 The Co-Administrators agree to provide the services described herein in
accordance  with the  performance  standards  annexed  hereto  as  Exhibit  1 of
Schedule  B  and  incorporated  herein  (the  "Performance   Standards").   Such
Performance Standards may be amended from time to time upon written agreement by
the parties.

     3.5  The  services  of  the  Co-Administrators  hereunder  are  not  deemed
exclusive and the Co-Administrators  shall be free to render similar services to
others so long as their services under this Agreement are not impaired thereby.

Article 4         Recordkeeping and Other Information.

     4.1 The Co-Administrators shall create and maintain all records required of
them  pursuant  to their  duties  hereunder  and as set forth in  Schedule  B in
accordance with all applicable laws, rules and  regulations,  including  records
required by Section 3l(a) of the 1940 Act. Where applicable,  such records shall
be  maintained  by the  Co-Administrators  for  the  periods  and in the  places
required by Rule 31a-2 under the 1940 Act.

     4.2  To  the  extent   required  by  Section  31  of  the  1940  Act,   the
Co-Administrators  agree that all such  records  prepared or  maintained  by the
Co-Administrators   relating   to  the   services   to  be   performed   by  the
Co-Administrators  hereunder are the property of the Fund and will be preserved,
maintained  and made  available in  accordance  with such  section,  and will be
surrendered promptly to the Fund on and in accordance with the Fund's request.

Article 5         Fund Instructions.

     5.1 A  Co-Administrator  will have no liability when acting upon Written or
Oral  Instructions   reasonably   believed  to  have  been  executed  or  orally
communicated by an Authorized  Person and will not be held to have any notice of
any change of  authority of any person  until  receipt of a Written  Instruction
thereof from the Fund.

     5.2 At any time, a Co-Administrator  may request Written  Instructions from
the Fund and may seek advice from legal  counsel for the Fund,  or its own legal
counsel,  with respect to any matter arising in connection  with this Agreement,
and it shall not be liable  for any  action  taken or not taken in good faith in
accordance  with such Written  Instructions or in accordance with the opinion of
counsel for the Fund or for the Co-Administrator. Written Instructions requested
by a Co-Administrator will be provided by the Fund within a reasonable period of
time.

     5.3 Each Co-Administrator,  its officers, agents or employees, shall accept
Oral  Instructions  or  Written   Instructions  given  to  them  by  any  person
representing or acting on behalf of the Fund only if said  representative  is an
Authorized  Person. The Fund agrees that all Oral Instructions shall be followed
within one business day by confirming Written Instructions,  and that the Fund's
failure to so confirm shall not impair in any respect a Co-Administrator's right
to rely on Oral Instructions.

Article 6         Compensation.

     6.1 Each  Co-Administrator  will from time to time employ or associate with
itself  such  person  or  persons  as the  Co-Administrator  may  believe  to be
particularly  suited to assist it in performing  services under this  Agreement.
Such person or persons  include  officers and employees who are employed by both
the  Co-Administrator   and  the  Fund.  The  Co-Administrator   shall  pay  the
compensation  of such person or persons and no  obligation  shall be incurred on
behalf of the Fund in such respect.

     6.2 The Co-Administrators shall not be required to pay any of the following
expenses  incurred  by the  Fund:  membership  dues  in the  Investment  Company
Institute or any similar  organization;  investment  advisory fees;  custody and
transfer agency fees;  fees paid under any service or distribution  plan adopted
by the  Fund;  costs  of  printing  and  mailing  stock  certificates;  costs of
typesetting  and  printing of the  Prospectus  for  regulatory  purposes and for
distribution to existing shareholders of the Portfolios;  costs of shareholders'
reports and notices;  interest on borrowed money; brokerage  commissions;  stock
exchange  listing  fees;  taxes and fees  payable  to  federal,  state and other
governmental agencies;  fees of Board Members of the Fund who are not affiliated
with the Co-Administrators;  outside auditing expenses;  outside legal expenses;
blue sky  registration  or filing fees; or other  expenses not specified in this
Section 6.2 which may be  properly  payable by the Fund.  The  Co-Administrators
shall not be required to pay any blue sky registration or filing fees unless and
until they have received the amount of such fees from the Fund.

     6.3 The  Fund on  behalf  of each of the  Portfolios  will  compensate  the
Co-Administrators   for  the  performance  of  their  obligations  hereunder  in
accordance  with the fees and  charges  set forth in the  written  Fee  Schedule
annexed hereto as Schedule C and incorporated herein.

     6.4 During the term of this Agreement,  the Co-Administrators  will pay all
expenses  incurred by them in connection  with the  performance  of their duties
under  Article 3 and Article 4 hereof,  other than those items listed in Section
6.2 and those  out-of-pocket costs of the preparations,  submissions,  updatings
and filings of the Fund's Prospectus.

     6.5 If in any fiscal year, the sum of a Portfolio's expenses (including the
fee  payable  pursuant  to Section  6.3 hereof,  but  excluding  the  investment
advisory  fee and  transfer  agency fee  payable  to  Northern  pursuant  to its
agreements  with the Fund,  servicing fees, and  extraordinary  expenses such as
taxes,  interest,  and indemnification  expenses) exceeds on an annualized basis
 .10% of a Portfolio's average net assets (.25% for each International  Portfolio
as  defined  in  Schedule  A to  this  Agreement)  for  such  fiscal  year,  the
Co-Administrators will reimburse each Portfolio for the amount of such excess in
accordance with the following timetable. Expense reimbursements, if any, will be
calculated  and  paid  monthly.  The  amount  of the  reimbursement  paid by the
Co-Administrators to each Portfolio will be computed as of the end of each month
by (a) determining the difference  between the  Portfolio's  accrued  annualized
expense  ratio  and  the  above  percentage  limitation;  (b)  multiplying  this
percentage  by the  Portfolio's  year to date  average  net asset value for such
month to obtain the cumulative dollar amount of such excess; and (c) subtracting
from the  cumulative  dollar  amount of such  excess  the  cumulative  amount of
reimbursements  made  to  such  Portfolio  by the  Co-Administrators  since  the
beginning of the fiscal year. A positive  remainder  represents the amount to be
paid by the Co-Administrators to the Portfolio;  a negative remainder represents
the amount to be paid by the Portfolio to the Co-Administrators.

     6.6 Any compensation  agreed to hereunder may be adjusted from time to time
by the unanimous consent of the parties.

Article 7  Documents.

         In connection with the appointment of the  Co-Administrators,  the Fund
shall,  on or before the  Effective  Date,  but in any case within a  reasonable
period of time for the  Co-Administrators  to prepare to  perform  their  duties
hereunder,  deliver  or  caused to be  delivered  to the  Co-Administrators  the
documents set forth in the written schedule of fund documents  annexed hereto as
Schedule D.

Article 8         Fund Accounting System.

     8.1 Each  Co-Administrator  shall retain title to and  ownership of any and
all data bases, computer programs,  screen formats, report formats,  interactive
design  techniques,  derivative works,  inventions,  discoveries,  patentable or
copyrightable matters, concepts,  expertise, patents, copyrights, trade secrets,
and other related legal rights owned and/or  developed by it in connection  with
the  services  provided by such  Co-Administrator  to the Fund  pursuant to this
Agreement (the "Co-Administrator System").

     8.2 Each  Co-Administrator  hereby grants to the Fund a limited  license to
the  Co-Administrator  System for the sole and  limited  purpose of having  such
Co-Administrator   provide  the  services  contemplated  hereunder  and  nothing
contained in this Agreement shall be construed or interpreted otherwise and such
license shall immediately terminate with the termination of this Agreement.

     8.3 In the event that the Fund,  including  any  affiliate  or agent of the
Fund or any third party  acting on behalf of the Fund,  is provided  with direct
access to the  Co-Administrator  System,  such direct access capability shall be
limited  to direct  entry to the  Co-Administrator  System  by means of  on-line
mainframe  terminal entry or PC emulation of such mainframe  terminal entry, and
any  other   non-conforming   method  of  transmission  of  information  to  the
Co-Administrator System is strictly prohibited without the prior written consent
of the particular Co-Administrator.

Article 9         Representations and Warranties.

     9.1 Investor Services Group represents and warrants to the Fund that:

          (a)  it is a corporation duly organized, existing and in good standing
               under the laws of the jurisdiction in which it is organized;

          (b)  it is  empowered  under  applicable  laws and by its  Articles of
               Incorporation  and By-Laws to enter into and perform the services
               contemplated by this Agreement;

          (c)  all requisite corporate  proceedings have been taken to authorize
               it to enter into this Agreement; and

          (d)  it has  and  will  continue  to  have  access  to  the  necessary
               facilities,  equipment  and  personnel  to perform its duties and
               obligations under this Agreement.

     9.2 Northern represents and warrants to the Fund that:

          (a)  it is duly  organized,  existing and in good  standing  under the
               laws of the jurisdiction in which it is organized;

          (b)  it is  empowered  under  applicable  laws and by its  Articles of
               Incorporation  and By-Laws to enter into and perform the services
               contemplated by this Agreement;

          (c)  all requisite corporate  proceedings have been taken to authorize
               it to enter into this Agreement; and

          (d)  it has  and  will  continue  to  have  access  to  the  necessary
               facilities,  equipment  and  personnel  to perform its duties and
               obligations under this Agreement.

     9.3 The Fund represents and warrants to each Co-Administrator that:

          (a)  it is duly  organized,  existing and in good  standing  under the
               laws of the jurisdiction in which it is organized;

          (b)  it is  empowered  under  applicable  laws and by its  Articles of
               Incorporation and By-Laws to enter into this Agreement;

          (c)  all   corporate   proceedings   required  by  said   Articles  of
               Incorporation,  By-Laws  and  applicable  laws have been taken to
               authorize it to enter into this Agreement;

          (d)  a registration  statement  under the 1933 Act and the 1940 Act on
               behalf of each of the Portfolios is currently effective; and

          (e)  as of the date  hereof,  each  Portfolio is duly  registered  and
               lawfully  eligible for sale in each  jurisdiction  indicated  for
               such  Portfolio on the list  furnished  to the  Co-Administrators
               pursuant to Article 7 of this  Agreement  and that it will notify
               the   Co-Administrators   immediately   of  any  changes  to  the
               aforementioned list.

Article 10         Indemnification.

     10.1 The Fund shall indemnify and hold each Co-Administrator  harmless from
and against any and all claims, costs, expenses (including reasonable attorneys'
fees), losses,  damages,  charges,  payments and liabilities of any sort or kind
which may be asserted against a Co-Administrator or for which a Co-Administrator
may  be  held  to  be  liable  in   connection   with   this   Agreement   or  a
Co-Administrator's performance hereunder (a "Claim"), unless such Claim resulted
from:   (a)  the  willful   misfeasance,   bad  faith  or   negligence  of  such
Co-Administrator in the performance of its duties hereunder, or by reason of its
reckless disregard thereof; or (b) such Co-Administrator's  breach of Article 14
of this Agreement.

     10.2 The Fund agrees and acknowledges that the  Co-Administrators  have not
prior to the Effective  Date assumed,  and will not assume,  any  obligations or
liabilities arising out of the conduct by the Fund or its administrator prior to
the Effective  Date of those duties which the  Co-Administrators  have agreed to
perform  pursuant to this  Agreement.  The Fund further agrees to indemnify each
Co-Administrator  against any losses,  claims, damages or liabilities to which a
Co-Administrator  may become subject in connection  with the conduct by the Fund
or its administrator of such duties prior to the Effective Date.

     10.3 Each  Co-Administrator  jointly and severally shall indemnify and hold
the  Fund  harmless  from  and  against  any and  all  claims,  costs,  expenses
(including reasonable attorneys' fees), losses, damages,  charges,  payments and
liabilities  of any sort or kind which may be  asserted  against the Fund or for
which the Fund may be held to be liable in connection with this Agreement or the
Fund's  performance  hereunder (a "Claim"),  provided  that such Claim  resulted
from:   (a)  the  willful   misfeasance,   bad  faith  or   negligence  of  such
Co-Administrator in the performance of its duties hereunder, or by reason of its
reckless disregard thereof; or (b) such Co-Administrator's  breach of Article 14
of this Agreement.

     10.4 In any case in which one party (the "Indemnifying Party") may be asked
to indemnify or hold  another  party (the  "Indemnified  Party")  harmless,  the
Indemnified  Party will notify the Indemnifying  Party in writing promptly after
identifying  any  situation  which it  believes  presents  or appears  likely to
present a claim for  indemnification  (an  "Indemnification  Claim") against the
Indemnifying  Party,  although  the  failure  to do so  shall  not  relieve  the
Indemnifying  Party  from  any  liability  which  it may  otherwise  have to the
Indemnified  Party, and the Indemnified Party shall keep the Indemnifying  Party
advised  with  respect  to  all  developments  concerning  such  situation.  The
Indemnifying  Party shall be entitled to  participate  at its own expense in the
defense, or if it so elects, to assume the defense of, any Indemnification Claim
which may be the  subject of this  indemnification,  and,  in the event that the
Indemnifying Party so elects, such defense shall be conducted by counsel of good
standing chosen by the Indemnifying Party and approved by the Indemnified Party,
which approval shall not be unreasonably withheld. In the event the Indemnifying
Party elects to assume the defense of any such Indemnification  Claim and retain
such  counsel,  the  Indemnified  Party shall bear the fees and  expenses of any
additional  counsel  retained by the  Indemnified  Party.  In the event that the
Indemnifying   Party  does  not  elect  to  assume  the   defense  of  any  such
Indemnification  Claim,  or in case the  Indemnified  Party  reasonably does not
approve  of  counsel  chosen by the  Indemnifying  Party,  or in case there is a
conflict of interest  between the Indemnifying  Party or the Indemnified  Party,
the  Indemnifying  Party will reimburse the  Indemnified  Party for the fees and
expenses of any counsel retained by the Indemnified Party. The Indemnified Party
will not confess any Indemnification Claim or make any compromise in any case in
which the Indemnifying  Party will be asked to provide  indemnification,  except
with the  Indemnifying  Party's prior written  consent.  The  obligations of the
parties  hereto  under this  Article 10 shall  survive the  termination  of this
Agreement.

Article 11         Standard of Care.

     11.1 The  Co-Administrators  shall at all times act in good faith and agree
to use their best efforts within  commercially  reasonable  limits to ensure the
accuracy  of  all  services  performed  under  this  Agreement,  but  assume  no
responsibility  for loss or damage to the Fund  unless said errors are caused by
the  Co-Administrators'  willful  misfeasance,  bad faith or  negligence  in the
performance of their duties hereunder,  or by reason of their reckless disregard
thereof.

     11.2 Each party shall have the duty to mitigate  damages for which  another
party may become responsible.

     11.3  Without  in  any  way  limiting  the  foregoing,  in  the  event  the
Co-Administrators   shall   provide   blue  sky   services  to  the  Fund,   the
Co-Administrators  shall have no liability for failing to file on a timely basis
any   material  to  be  provided   by  the  Fund  or  its   designee   that  the
Co-Administrators  have  not  received  on a timely  basis  from the Fund or its
designee,  nor shall the Co-Administrators have any responsibility to review the
accuracy or adequacy of materials they receive from the Fund or its designee for
filing; nor shall the Co-Administrators  have any liability for monetary damages
for the sale of  securities  in  jurisdictions  where  Shares  are not  properly
registered,  or in jurisdictions where Shares are sold in excess of the lawfully
registered amount, unless such failure of proper registration or excess sales is
due  to   the   willful   misfeasance,   bad   faith   or   negligence   of  the
Co-Administrators,  or the reckless  disregard of their  duties  hereunder.  The
Co-Administrators  shall  not  be  liable  for  any  errors  which  result  from
inaccurate or inadequate information reported to the Co-Administrators  directly
or indirectly  from the Fund's transfer agent.  The  Co-Administrators  shall be
under no  obligation to  investigate  or confirm the accuracy or adequacy of any
information provided to the Co-Administrators by the Fund's transfer agent.

     11.4  NOTWITHSTANDING  ANYTHING IN THIS  AGREEMENT TO THE  CONTRARY,  IN NO
EVENT  SHALL  ANY  PARTY,  ITS  AFFILIATES  OR ANY OF  ITS OR  THEIR  DIRECTORS,
TRUSTEES,  OFFICERS,  EMPLOYEES, AGENTS OR SUBCONTRACTORS BE LIABLE TO ANY OTHER
PARTY FOR CONSEQUENTIAL DAMAGES.

Article 12         Term and Termination.

     12.1 This Agreement  shall be effective on the Effective  Date and,  unless
sooner  terminated as provided herein,  shall continue until April 30, 2001 (the
"Initial Term").

     12.2 Upon the expiration of the Initial Term, this Agreement shall continue
automatically  for successive  one-year terms ("Renewal  Terms") with respect to
each  Portfolio,  provided such  continuance is  specifically  approved at least
annually  by (i) the  Board of  Directors  or (ii) by a vote of a  majority  (as
defined in the 1940 Act and Rule 18f-2  thereunder)  of the  outstanding  voting
securities  of the  particular  Portfolio,  provided  that in  either  event the
continuance  is also  approved  by a majority  of the Board  Members who are not
parties to this Agreement and who are not interested  persons (as defined in the
1940  Act) of any party to this  Agreement,  by vote cast in person at a meeting
called for the purpose of voting on such approval.

     12.3 The Fund may  terminate  this  Agreement at any time after the Initial
Term, with or without cause,  and without  penalty,  on at least sixty (60) days
written notice to the Co-Administrators.

     12.4 Each  Co-Administrator  may terminate  this  Agreement with respect to
itself at any time after the Initial Term,  with or without  cause,  and without
penalty,  on at least sixty (60) days  written  notice to the Fund and the other
Co-Administrator.

     12.5 The Fund may terminate  this  Agreement at any time during the Initial
Term in the event that the Fund or its  shareholders  incur damages in excess of
one hundred thousand dollars ($100,000) as a result of the willful  misfeasance,
bad faith or negligence of the  Co-Administrators,  or the reckless disregard of
their duties hereunder. For this purpose, "damages" is defined as damages caused
by a single event,  or cumulative  series of events  related to the same matter,
which  generates  a monetary  loss to the Fund or its  shareholders.  The Fund's
right to  terminate  this  Agreement  pursuant to this Section 12.5 shall remain
effective even if the  Co-Administrators  have made the Fund or its shareholders
whole with respect to the damages caused.

     12.6 The Fund may also  terminate  this  Agreement  at any time  during the
Initial  Term,  regardless  of  the  amount  of  damages  to  the  Fund  or  its
shareholders, in the event that the Co-Administrators have failed to meet one of
the  performance  standards set forth in Exhibit 1 to Schedule B (a  "Triggering
Event").  The Fund will  provide  the  Co-Administrators  with  sixty  (60) days
written  notice if the Fund  intends to exercise  its option to  terminate  this
Agreement under this Section 12.6; provided,  however,  that such notice must be
given  within  sixty  (60)  days  following  the end of the  month in which  the
Triggering Event occurs.  Notwithstanding the foregoing, the Fund's rights under
this Section 12.6 shall not become  effective  until ninety (90) days  following
the Effective Date.

     12.7 In the event this Agreement: (a) is terminated by the Fund pursuant to
Section 12.5, Section 12.6 or Section 12.9 hereof; or (b) is not continued after
the expiration of the Initial Term or any Renewal Term, all reasonable  expenses
associated with the movement of records and materials and conversion  thereof to
a successor administrator shall be borne by the Co-Administrators,  and the Fund
shall not be responsible for the  Co-Administrators'  costs associated with such
termination;  provided,  however, that such expenses shall not exceed $25,000 in
the event this  Agreement is not continued  after the  expiration of the Initial
Term or any Renewal Term. In the event this  Agreement is terminated by the Fund
pursuant to any other  provision  of this  Agreement,  all  reasonable  expenses
associated  with conversion to a successor  administrator  shall be borne by the
Fund.

     12.8 Notwithstanding  anything contained in this Agreement to the contrary,
unless this  Agreement is terminated  pursuant to Section 12.5,  Section 12.6 or
Section  12.9 hereof,  should the Fund move any of the services  provided by the
Co-Administrators  hereunder to a successor  service provider during the Initial
Term, or should, during the Initial Term, all or substantially all of the Fund's
assets be merged with or purchased by another  entity which does not utilize the
services of the  Co-Administrators,  the Co-Administrators  shall be entitled to
receive fees from the Fund for the period from the date of such movement, merger
or purchase until the end of the Initial Term (the "Unexpired  Term").  The fees
payable  for  the  Unexpired  Term  shall  be  accelerated  to the  date of such
movement,  merger or purchase and shall be calculated in accordance with Section
6.3 herein at the asset  levels on such date.  The  expense  reimbursements  set
forth in Section 6.5 hereof shall not apply to the Unexpired Term.

     12.9  The Fund may  terminate  this  Agreement  upon  its  Assignment  by a
Co-Administrator  unless the conditions to an Assignment as set forth in Article
16 hereof have been satisfied.

Article 13         Additional Portfolios.

         In the  event  that  the Fund  establishes  one or more  Portfolios  in
addition  to those  identified  in  Schedule  A with  respect  to which the Fund
desires to have the Co-Administrators render services as administrator under the
terms hereof, the Fund shall so notify the  Co-Administrators in writing, and if
the  Co-Administrators  agree in writing to provide  such  services,  Schedule A
shall be deemed amended to include such additional Portfolios.

Article 14        Confidentiality.

     14.1 The parties agree that the Proprietary  Information (defined below) is
confidential information of the parties and their respective licensers. The Fund
and the  Co-Administrators  shall exercise at least the same degree of care, but
not  less  than  reasonable  care,  to  safeguard  the  confidentiality  of  the
Proprietary  Information  of each other as they would  exercise to protect their
own  Proprietary  Information.  The Fund and the  Co-Administrators  may use the
Proprietary  Information  only to exercise  their  respective  rights or perform
their respective  duties under this Agreement.  Except as otherwise  required by
law, the Fund and the Co-Administrators shall not duplicate, sell or disclose to
others the Proprietary  Information of the other,  in whole or in part,  without
the  prior  written   permission  of  the  affected  party.  The  Fund  and  the
Co-Administrators  may,  however,  disclose  Proprietary  Information  to  their
respective  employees  who have a need to know the  Proprietary  Information  to
perform  work for the other,  provided  that the Fund and the  Co-Administrators
shall use reasonable  efforts to ensure that the Proprietary  Information is not
duplicated  or  disclosed  by  their  respective  employees  in  breach  of this
Agreement.  The Fund and the Co-Administrators may also disclose the Proprietary
Information  to independent  contractors,  auditors and  professional  advisors,
provided they first agree in writing to be bound by confidentiality  obligations
substantially  similar  to  this  Section  14.1.  Notwithstanding  the  previous
sentence,  in no event shall either the Fund or the  Co-Administrators  disclose
the  Proprietary  Information to any  competitor of the other without  specific,
prior written consent.

     14.2 Proprietary Information means:

          (a)  any data or information that is competitively sensitive material,
               and not generally known to the public, including, but not limited
               to,  information  about  product  plans,   marketing  strategies,
               finance, operations,  customer relationships,  customer profiles,
               sales estimates, business plans, and internal performance results
               relating to the past,  present or future  business  activities of
               the Fund or the Co-Administrators,  their respective subsidiaries
               and affiliated companies and the customers, clients and suppliers
               of any of them;

          (b)  any  scientific  or  technical  information,   design,   process,
               procedure,  formula or improvement that is commercially  valuable
               and secret in the sense that its confidentiality affords the Fund
               or the  Co-Administrators  a  competitive  advantage  over  their
               competitors;

          (c)  all confidential or proprietary concepts, documentation, reports,
               data,  specifications,  computer  software,  source code,  object
               code, flow charts, databases,  inventions, know-how, show-how and
               trade secrets, whether or not patentable or copyrightable;

          (d)  all documents, inventions, substances, engineering and laboratory
               notebooks, drawings, diagrams, specifications, bills of material,
               equipment,   prototypes  and  models,   and  any  other  tangible
               manifestation  of the  foregoing  of any party  hereto  which now
               exist or come into the control or possession of the other; and

          (e)  with  respect  to the Fund,  all  records  and other  information
               relative  to  the  Fund  and  its  prior,  present  or  potential
               shareholders (and clients of such shareholders).

     14.3 The obligations of confidentiality and restriction on use herein shall
not apply to any Proprietary Information that a party proves:

          (a)  Was in the public  domain prior to the date of this  Agreement or
               subsequently came into the public domain through no fault of such
               party; or

          (b)  Was lawfully received by the party from a third party free of any
               obligation of confidence to such third party; or

          (c)  Was  already  in the  possession  of the party  prior to  receipt
               thereof, directly or indirectly, from the other party; or

          (c)  Is  required  to be  disclosed  in a judicial  or  administrative
               proceeding  after all reasonable  legal remedies for  maintaining
               such information in confidence have been exhausted including, but
               not limited to, giving the other party as much advance  notice of
               the  possibility  of such  disclosure  as  practical so the other
               party may attempt to stop such  disclosure or obtain a protective
               order concerning such disclosure; or

          (d)  Is  subsequently  and   independently   developed  by  employees,
               consultants  or  agents  of the party  without  reference  to the
               Proprietary Information disclosed under this Agreement.

     14.4  Notwithstanding the foregoing,  it is hereby understood and agreed by
the  parties  hereto  that  any  marketing  strategies,   customer  profiles  or
administrative,  business  or  shareholder  servicing  plans  or  similar  items
prepared or developed by the Co-Administrators for the benefit of the Fund shall
be  considered  the  Proprietary  Information  of the Fund and  nothing  in this
Agreement  shall be construed  to prevent or prohibit  the Fund from  disclosing
such Proprietary Information to a successor administrator.

     14.5 The  obligations  of the parties  hereto  under this  Article 14 shall
survive the termination of this Agreement.

Article 15         Force Majeure.

     No party shall be liable for any default or delay in the performance of its
obligations  under this  Agreement if and to the extent such default or delay is
caused, directly or indirectly,  by circumstances beyond such party's reasonable
control.  In any such event, the non-performing  party shall be excused from any
further  performance  and observance of the  obligations so affected only for as
long as such circumstances  prevail and such party continues to use commercially
reasonable   efforts  to  recommence   performance  or  observance  as  soon  as
practicable.

Article 16        Assignment and Subcontracting.

     This  Agreement,  its  benefits and  obligations  shall be binding upon and
inure to the benefit of the parties hereto and their  respective  successors and
permitted assigns. Except for the pending acquisition of Investor Services Group
by PNC Bank Corp, this Agreement may not be Assigned or otherwise transferred by
any  party  hereto  without  the prior  written  consent  of the other  parties;
provided,  however, that each party may, in its sole discretion,  Assign all its
right, title and interest in this Agreement to an entity controlling, controlled
by, or under common control with,  such party,  provided that, in the reasonable
judgment  of the Board of  Directors  determine  in its sole  discretion  within
ninety  (90)  days of  receiving  written  notice  of such  Assignment:  (i) the
financial capacity of a Co-Administrator's  assignee is not materially less than
that of the Co-Administrator;  (ii) the nature and quality of the services to be
provided hereunder are not materially adversely affected by such Assignment; and
(iii)  the  quality  and  capability  of  the  personnel  and  facilities  of  a
Co-Administrator's   assignee  are  not  materially   less  than  those  of  the
Co-Administrator.  The Co-Administrators  may, in their sole discretion,  engage
subcontractors  to  perform  any  non-material  or  non-substantive  obligations
contained  in this  Agreement  that  they  are  otherwise  required  to  perform
hereunder,  provided that the  Co-Administrators  shall be  responsible  for all
compensation payable to such subcontractors and shall remain responsible for the
acts  and  omissions  of  such  subcontractors  to  the  same  extent  that  the
Co-Administrators are hereunder.

Article 17      Notice.

     Any notice or other instrument  authorized or required by this Agreement to
be given in  writing  to the Fund or a  Co-Administrator  shall be  sufficiently
given if  addressed  to a party and received by it at its office set forth below
or at such other place as it may from time to time designate in writing.

                                            To the Fund:
<TABLE>
<CAPTION>
<S>                                         <C>

                                            James D. Grassi, Esq.
                                            The Northern Trust Company
                                            50 South LaSalle Street - M-9
                                            Chicago, IL 60675

                                            with a copy to:

                                            W. Bruce McConnel, III, Esq.
                                            One Logan Square
                                            18th and Cherry Streets
                                            Philadelphia, PA  19103-6996

                                            To Northern:

                                            James D. Grassi, Esq.
                                            The Northern Trust Company
                                            50 South LaSalle Street - M-9
                                            Chicago, IL 60675

                                            To Investor Services Group:

                                            First Data Investor Services Group, Inc.
                                            4400 Computer Drive
                                            Westboro, Massachusetts 01581
                                            Attention: President
</TABLE>

with a copy to Investor Services Group's General Counsel

Article 18         Governing Law/Venue.

     The  laws of the  Commonwealth  of  Massachusetts,  excluding  the  laws on
conflicts of laws, shall govern the interpretation, validity, and enforcement of
this  Agreement  (except as to Article 24 hereof  which  shall be  construed  in
accordance with the laws of the State of Delaware).  All actions arising from or
related  to this  Agreement  shall be brought  in the state and  federal  courts
sitting in the City of Boston,  and the parties hereby submit  themselves to the
exclusive jurisdiction of those courts.

Article 19        Counterparts.

     This Agreement may be executed in any number of counterparts, each of which
shall be  deemed  to be an  original;  but such  counterparts  shall,  together,
constitute only one instrument.

Article 20         Captions.

     The captions of this  Agreement are included for  convenience  of reference
only and in no way  define or limit any of the  provisions  hereof or  otherwise
affect their construction or effect.

Article 21        Publicity.

     No party shall  release or publish  news  releases,  public  announcements,
advertising or other publicity relating to this Agreement or to the transactions
contemplated  by it without the prior  review and written  approval of the other
parties;  provided,  however,  that a party  may make  such  disclosures  as are
required by legal, accounting or regulatory requirements after making reasonable
efforts in the circumstances to consult in advance with the other parties.

Article 21        Relationship of Parties.

     The Co-Administrators  agree that they are independent  contractors and not
partners or co-venturers  and nothing  contained  herein shall be interpreted or
construed otherwise.

Article 22         Entire Agreement; Severability.

   23.1 This Agreement, including all Schedules and Exhibits hereto, constitutes
the entire  Agreement  between the parties  with  respect to the subject  matter
hereof  and  supersedes  all prior and  contemporaneous  proposals,  agreements,
contracts, representations and understandings,  whether written or oral, between
the parties with respect to the subject matter hereof.  No change,  termination,
modification  or waiver of any term or condition of the Agreement shall be valid
unless in writing  signed by each party.  No such writing  shall be effective as
against Investor Services Group unless said writing is executed by a Senior Vice
President,  Executive Vice President or President of Investor Services Group. No
such  writing  shall be  effective  as against the Fund  unless said  writing is
executed  by  the  Chairman  of  the  Board  of  Directors  or  another   person
specifically  designated  by the Board of  Directors.  No such writing  shall be
effective  as against  Northern  unless  said  writing is  executed  by the Vice
President,  Senior Vice  President,  Executive  Vice  President  or President of
Northern. A party's waiver of a breach of any term or condition in the Agreement
shall  not be deemed a waiver of any  subsequent  breach of the same or  another
term or condition.

     23.2 The parties intend every  provision of this Agreement to be severable.
If a court of competent  jurisdiction  determines  that any term or provision is
illegal or invalid for any reason, the illegality or invalidity shall not affect
the validity of the remainder of this Agreement. In such case, the parties shall
in good faith modify or substitute  such provision  consistent with the original
intent of the parties.  Without limiting the generality of this paragraph,  if a
court  determines  that any remedy  stated in this  Agreement  has failed of its
essential  purpose,  then all other  provisions of this  Agreement  shall remain
fully effective.

Article 24         Board Member and Shareholder Liability.

     This Agreement is executed by or on behalf of the Fund with respect to each
of the Portfolios and the obligations  hereunder are not binding upon any of the
Board Members, officers or shareholders of the Fund individually but are binding
only upon the  Portfolio  to which such  obligations  pertain and the assets and
property of such  Portfolio.  All  obligations  of the Fund under this Agreement
shall  apply  only on a  Portfolio-by-Portfolio  basis,  and the  assets  of one
Portfolio shall not be liable for the obligations of another Portfolio.



<PAGE>


         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed all as of the Effective Date.

                                            NORTHERN INSTITUTIONAL FUNDS

                                            By: /s/ Jylanne Dunne

                                            Name:   Jylanne Dunne

                                            Title:  President


                                            THE NORTHERN TRUST COMPANY

                                            By: /s/ Archibald E. King

                                            Name:   Archibald E. King

                                            Title:  Vice President


                    FIRST DATA INVESTOR SERVICES GROUP, INC,

                                            By:     /s/James L. Fox

                                            Name:    James L. Fox

                                            Title:  President



<PAGE>


                                   SCHEDULE A

                               LIST OF PORTFOLIOS


Non-International Portfolios:

Government Select Portfolio
Government Portfolio
Diversified Assets Portfolio
Tax-Exempt Portfolio
Municipal Portfolio
U.S. Government Securities Portfolio
Short-Intermediate Bond Portfolio
U.S. Treasury Index Portfolio
Bond Portfolio
Intermediate Bond Portfolio
Balanced Portfolio
Equity Index Portfolio
Diversified Growth Portfolio
Focused Growth Portfolio
Small Company Index Portfolio
Small Company Growth Portfolio
MidCap Growth Portfolio
MarketPower Portfolio

International Portfolios:

International Bond Portfolio
International Equity Index Portfolio
International Growth Portfolio



<PAGE>


                                   SCHEDULE B

                         DUTIES OF THE CO-ADMINISTRATORS

          (a)  Maintaining  office  facilities (which may be in the offices of a
               Co-Administrator   or  a  corporate   affiliate)  and  furnishing
               corporate officers for the Fund;

          (b)  Furnishing  data  processing  services,  clerical  services,  and
               executive and administrative services and standard stationery and
               office supplies;

          (c)  Performing all functions  ordinarily performed by the office of a
               corporate  treasurer,  and furnishing the services and facilities
               ordinarily incident thereto, as follows:

                    Expense accrual  monitoring and payment of the Fund's bills,
                         preparing monthly  reconciliation of the Fund's expense
                         records and updating projections of annual expenses

                    Determining dividends

                    Calculating yields and total returns

                    Preparing  materials  for review by the Board of  Directors,
                         e.g.,  written reports  pursuant to Rules 2a-7,  10f-3,
                         17a-7,   17e-1  and  144A  and  the  Fund's  applicable
                         procedures

                    Tax  and financial counsel

                    Creating expense pro formas for new Portfolios/classes

                    Reporting Fund statistical information to investment company
                         reporting  agencies  and  associations   (e.g.,  Lipper
                         Analytical  Services,  Inc. and the Investment  Company
                         Institute)

                    Compliance testing (e.g., to test compliance with applicable
                         provisions  of the  Prospectus,  1940 Act and  Internal
                         Revenue Code)

          (d)  Preparing and submitting  reports to the Fund's  shareholders and
               the Commission including,  but not necessarily limited to, Annual
               Reports and Semi-Annual Reports on Form N-SAR;

          (e)  Preparing and printing financial statements;

          (f)  Preparing monthly Portfolio profile reports;

          (g)  Preparing  and filing the Fund's  federal  and state tax  returns
               (other than those  required  to be filed by the Fund's  custodian
               and transfer agent) and providing  shareholder tax information to
               the Fund's transfer agent;

          (h)  Assisting  the  Fund's  investment   adviser,  at  the  adviser's
               request, in monitoring and developing  compliance  procedures for
               the Fund which will include,  among other matters,  procedures to
               assist the adviser in monitoring compliance with each Portfolio's
               investment  objective,  policies,  restrictions,  tax matters and
               applicable laws and regulations;

          (i)  Assisting in marketing strategy and product development;

          (j)  Performing oversight/management  responsibilities,  including the
               following:

                    Supervision and coordination of transfer agent

                    Supervision and coordination of IRA custodian

                    Supervision and coordination of Fund custodian

                    Vendor management and invoicing

                    Daily report coordination

                    Media relations

                    Sales literature forms and development

                    Fund operations coordination

                    Management of auditor relationship

                    Oversight of Portfolio compliance and tax function

          (k)  Performing "blue sky" compliance functions, as follows:

                    Effecting  and   maintaining,   as  the  case  may  be,  the
                         registration  of Shares of the Fund for sale  under the
                         securities  laws  of the  jurisdictions  listed  in the
                         Written  Instructions of the Fund,  which  instructions
                         will include the amount of Shares to be  registered  as
                         well as the warning threshold to be maintained.

                    Filing with each  appropriate  jurisdiction  the appropriate
                         materials relating to the Fund.

                    Providing to the Fund quarterly reports of sales activity in
                         each   jurisdiction  in  accordance  with  the  Written
                         Instructions  of the Fund.  Sales will be  reported  by
                         shareholder residence.  NSCC trades and order clearance
                         will be reported by the state provided by the dealer at
                         the point of sale.  Trades by omnibus  accounts will be
                         reported by trustee  state of residence  in  accordance
                         with the Written Instructions of the Fund outlining the
                         entities  which  are  permitted  to  maintain   omnibus
                         positions with the Fund.

                    In   the event sales of Shares in a particular  jurisdiction
                         reach or exceed  the  warning  levels  provided  in the
                         Written Instructions of the Fund, the Co-Administrators
                         will promptly notify the Fund with a recommendation  of
                         the  amount  of  Shares  to  be   registered   in  such
                         jurisdiction  and the fee for  such  registration.  The
                         Co-Administrators  will not register  additional Shares
                         in   such    jurisdiction    unless   and   until   the
                         Co-Administrators    shall   have   received    Written
                         Instructions to do so.

                    If   the Co-Administrators are instructed by the Fund not to
                         register  Shares  in  a  particular  jurisdiction,  the
                         Co-Administrators  will use their best efforts to cause
                         any sales in such jurisdictions to be blocked, and such
                         sales will not be reported to the  Co-Administrators as
                         sales of Shares of the Fund.

          (i)  Performing   corporate   secretarial   services   including   the
               following:

                    Assist in  maintaining  corporate  records and good standing
                         status of Fund in its state of organization

                    Develop and maintain  calendar of annual and quarterly board
                         approvals and regulatory filings

                    Prepare   notice,   agenda,   memoranda,   resolutions   and
                         background  materials for legal  approvals at quarterly
                         and special  board  meetings  and  committee  meetings;
                         assemble  and  distribute  board  materials  for  board
                         meetings and committee meetings;  attend meetings; make
                         presentations   where  appropriate;   prepare  minutes;
                         follow up on issues;  prepare such periodic and special
                         reports as the Board Members may reasonably request

                    Provide support for written consent votes where needed

          (m)  Monitoring  the Fund's  arrangements  with  respect  to  services
               provided by institutions  ("Servicing Agents") to their customers
               who are the beneficial  owners of Shares,  pursuant to agreements
               ("Servicing  Agreements")  between  the Fund  and such  Servicing
               Agents including:

                    Review the  qualifications  of Servicing  Agents  wishing to
                         enter into Servicing Agreements

                    Assist in the execution and delivery of Servicing Agreements

                    Report to the Board of Directors with respect to the amounts
                         paid or payable by the Fund from time to time under the
                         Servicing  Agreements  and the  nature of the  services
                         provided by Servicing Agents.

                    Maintain  appropriate   records  in  connection  with  their
                         monitoring duties

          (n)  Performing the following legal services:

                    Prepare and file  annual  Post-Effective  Amendments  to the
                         Fund's Registration Statement

                    Prepare and file Rule 24f-2 Notices

                    Prepare and file Forms N-SAR

                    Prepare and file Annual and Semi-Annual Financial Reports

                    Communicate    significant    regulatory   or    legislative
                         developments  to Fund  management and Board Members and
                         provide related planning assistance where needed.

                    Consult with Fund management  regarding portfolio compliance
                         and Fund corporate and regulatory issues as needed

                    Maintain effective communication with outside counsel

                    Arrange D&O/E&O  insurance  and fidelity  bond  coverage for
                         Fund

                    Assist in  monitoring  Fund  Code of  Ethics  reporting  and
                         provide such reports to the person designated under the
                         Fund's Code

                    Monitor  handling  of  litigation  by  outside  counsel  and
                         non-routine regulatory matters

                    Assist in  managing  Commission  audits  of the  Fund at the
                         investment adviser's principal place of business

                    Review sales material and  advertising  for Fund  Prospectus
                         compliance

                    Assist in developing compliance guidelines and procedures to
                         improve   overall   compliance   by  Fund  and  service
                         providers

                    Prepare compliance manuals

          (o)  Performing,  in accordance  with the Written  Instructions of the
               Fund,  Special  Legal  Services  in  accordance  with the pricing
               structure  listed on the Fee Schedule  attached to this Agreement
               as Schedule C. Examples of such Special Legal Services are:

                    Assist in new Portfolio start-up (to the extent requested):

                    Coordinate time and  responsibility  schedules

                    Prepare Fund corporate documents

                    Draft/file  registration   statement  (including  investment
                         objectives/policies and prospectuses)

                    Respond to and negotiate Commission comments

                    Draftnotice,   agenda  and  resolutions  for  organizational
                         meeting; attend board meeting; make presentations where
                         appropriate; prepare minutes and follow up on issues

                    Prepare proxy materials for special meetings of shareholders
                         (including fund merger documents)

                    Prepare  Post-Effective   Amendments  for  special  purposes
                         (e.g.,  new  funds  or  classes,  changes  in  advisory
                         relationships, mergers, restructurings)

                    Assist in extraordinary  non-recurring  projects,  including
                         providing consultative legal services, such as: Arrange
                         CDSC  financial  programs   Prospectus   simplification
                         Profile   prospectuses   Exemptive  order  applications
                         Requests for no-action letters



<PAGE>


                             EXHIBIT 1 TO SCHEDULE B
                              PERFORMANCE STANDARDS

The  Co-Administrators'  obligation to meet the following  Performance Standards
shall be measured in the aggregate with respect to all Portfolios of the Fund.

The Co-Administrators  will report to the Fund on a monthly basis the percent of
items completed  within standard as well as a quality rating.  Reporting will be
detailed  to  the  transaction  type  level.  A  pass/fail   determination   for
contractual  penalties will be based on the categories  listed below.  Note that
completion standards are measured in business days.

Fund Administration (Treasury and Reporting)Tax/Compliance

The following standards will be met 100% of the time:

     All  Commission   and   Internal   Revenue   Service   ("IRS")   regulatory
          requirements  will be met  according to the deadlines set forth by the
          Commission and the IRS

     Notification to the Fund's investment  adviser within two (2) business days
          with  compliance  violations  based on procedures  established  by and
          among the Co-Administrators and the Fund.

     Directors & Officers Errors & Omissions Insurance Coverage will be reviewed
          annually

     Rule 17g-1   Fidelity  Bond  filings  will  be  made  as  required  by  the
          regulations of the Commission

The following standard will be met 98% of the time:

     Code of  Ethics  reporting  forms  will be  circulated  at least  seven (7)
          business
     days before each quarter end

Blue Sky

The following standard will be met 98% of the time:

     Annual renewal filings will be submitted at least thirty (30) business days
          prior to expiration

     Filings of Prospectus and Annual  Reports will be submitted  within fifteen
          (15) business days of printing/release

Legal Administration

     The  following  standards  will be met 98% of the  time  as  measured  on a
          quarterly basis:

          Board  materials will be sent to the Fund for review at least fourteen
          (14)  business  days  prior to the Board  meeting,  provided  that all
          requested  information  has  been  received  by the  Co-Administrators
          within  agreed-upon  time frames Board  materials  will be sent to the
          Board  Members  at least  seven (7)  business  days prior to the Board
          meeting,  provided that all requested information has been received by
          the Co-Administrators within agreed-upon time frames

          Timely submission of sales literature to NASD, provided that copies of
     such materials are provided to the Co-Administrators or their affiliates on
     a timely basis



<PAGE>


                                   SCHEDULE C

                                  FEE SCHEDULE

         For the services rendered,  expenses assumed,  facilities furnished and
payments made by the Co-Administrators,  as provided for in this Agreement,  the
Fund, on behalf of each Portfolio, on the first business day of each month, will
pay to Northern,  as agent for itself and Investor Services Group, a fee for the
previous month at the annualized rates listed below.
<TABLE>
<CAPTION>
<S><C>                                     <C>

1.       Standard Annual Fees:              Non-International Portfolios:
                                                     .10% of each Portfolio's average daily net assets

                                                     International Portfolios:
                                                     .15% of each Portfolio's average daily net assets

         The foregoing fee will be computed based on net assets on each day.

2. Fees for Special Legal Services:  The Co-Administrators  shall be entitled to
the following fee for the performance of any Special Legal Services as described
in Schedule B in accordance with the Written  Instructions of the Fund: $185 per
hour   subject   to   certain   project   caps  as  may  be  agreed  to  by  the
Co-Administrators and the Fund.
Services and charges may vary based on volume.

</TABLE>


<PAGE>


                                   SCHEDULE D

                                 FUND DOCUMENTS

          Certified copy of the Articles of Incorporation of the Fund

          Certified copy of the By-Laws of the Fund

          Copy of the  resolution  of the  Board of  Directors  authorizing  the
     execution and delivery of this Agreement

          Copies of all agreements between the Fund and its service providers

          A listing of all  jurisdictions  in which each Portfolio is registered
     and lawfully  available  for sale as of the date of this  Agreement and all
     information  relative to the monitoring of sales and  registrations  of the
     Shares in such jurisdictions

          The Fund's most recent  post-effective  amendment to its  registration
     statement

          The Fund's Prospectus



                                                                  Exhibit (j)(1)
                               Consent of Counsel

    We hereby  consent to the use of our name and to the references to our Firm
under the caption  "Additional  Trust Information - Counsel and Auditors" in the
Statement of Additional Information included in Post-Effective  Amendment No. 43
to the Registration  Statement on Form N-1A under the Securities Act of 1933, as
amended (the "1933 Act"), of Northern Institutional Funds (File Nos. 2-80543 and
811-3605).  This consent does not  constitute a consent  under  section 7 of the
1933 Act, and in  consenting  to the use of our name and the  references  to our
Firm  under  such  caption we have not  certified  any part of the  Registration
Statement  and do not  otherwise  come within the  categories  of persons  whose
consent is required  under said  section 7 or the rules and  regulations  of the
Securities and Exchange Commission thereunder.



                         /s/Drinker Biddle & Reath LLP
                           Drinker Biddle & Reath LLP

Philadelphia, Pennsylvania
January 28, 2000


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