CALVERT SOCIAL INVESTMENT FUND
497, 1999-05-13
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                        CALVERT SOCIAL INVESTMENT FUND
     (Balanced, Bond, Equity, Money Market and Managed Index Portfolios)
               4550 Montgomery Avenue, Bethesda, Maryland 20814

                     Statement of Additional Information
                               January 31, 1999
                            As revised May 6, 1999

New Account Information
         (800) 368-2748
         (301) 951-4820

Shareholder Services
         (800) 368-2745

Broker Services
         (800) 368-2746
         (301) 951-4850

TDD for the Hearing- Impaired
         (800) 541-1524

         This   Statement  of   Additional   Information   ("SAI")  is  not  a
prospectus.  Investors should read the Statement of Additional  Information in
conjunction  with the Fund's  Prospectus,  dated January 31, 1999.  The Fund's
audited  financial  statements  included in its most recent  Annual  Report to
Shareholders,  are expressly  incorporated  by  reference,  and made a part of
this  SAI.  The  prospectus  and the most  recent  shareholder  report  may be
obtained  free of charge by writing  the Fund at the above  address or calling
the Fund.


                     TABLE OF CONTENTS

Investment Policies and Risks                                         2
Investment Restrictions                                               8
Investment Selection Process                                          9
Dividends, Distributions and Taxes                                   10
Net Asset Value                                                      11
Calculation of Yield and Total Return                                13
Purchase and Redemption of Shares                                    15
Advertising                                                          16
Trustees, Officers and Advisory Council                              16
Investment Advisor                                                   19
Method of Distribution                                               21
Transfer and Shareholder Servicing Agents                            23
Portfolio Transactions                                               24
Independent Accountants and Custodians                               25
Control Persons and Principal Holders of Securities                  25
General Information                                                  26
Appendix                                                             26

<PAGE>

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                        INVESTMENT POLICIES AND RISKS
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Foreign Securities (not applicable to managed index or money market)
         Investments  in foreign  securities  may present  risks not typically
involved  in  domestic  investments.   The  Portfolios  may  purchase  foreign
securities  directly,  on foreign  markets,  or those  represented by American
Depositary  Receipts  ("ADRs"),  or other  receipts  evidencing  ownership  of
foreign  securities,  such as  International  Depository  Receipts  and Global
Depositary Receipts.  ADRs are US  dollar-denominated  and traded in the US on
exchanges  or over the counter.  By investing in ADRs rather than  directly in
foreign  issuers'  stock,  the Portfolios may possibly avoid some currency and
some liquidity  risks.  The  information  available for ADRs is subject to the
more uniform and more exacting  accounting,  auditing and financial  reporting
standards of the domestic market or exchange on which they are traded.
         Additional  costs may be incurred in  connection  with  international
investment  since  foreign  brokerage  commissions  and  the  custodial  costs
associated  with  maintaining  foreign  portfolio   securities  are  generally
higher  than in the  United  States.  Fee  expense  may  also be  incurred  on
currency  exchanges when the Portfolios  change  investments  from one country
to another or converts foreign securities holdings into US dollars.
         United  States  Government  policies  have  at  times,  in the  past,
through  imposition  of interest  equalization  taxes and other  restrictions,
discouraged  certain  investments  abroad  by  United  States  investors.   In
addition,  foreign  countries  may impose  withholding  and taxes on dividends
and interest.
         Investing in emerging  markets in particular,  those  countries whose
economies  and  capital  markets  are  not  as  developed  as  those  of  more
industrialized  nations,  carries its own special  risks.  Among other  risks,
the economies of such  countries  may be affected to a greater  extent than in
other  countries  by price  fluctuations  of a  single  commodity,  by  severe
cyclical  climactic  conditions,  lack of  significant  history  in  operating
under a market-oriented  economy, or by political instability,  including risk
of expropriation.
         Since  investments  in  securities  of issuers  domiciled  in foreign
countries usually involve currencies of the foreign  countries,  and since the
Portfolios  may  temporarily  hold  funds in  foreign  currencies  during  the
completion of investment  programs,  the value of the assets of the Portfolios
as  measured  in  United   States   dollars  may  be  affected   favorably  or
unfavorably  by  changes  in  foreign  currency  exchange  rates and  exchange
control  regulations.  For  example,  if the value of the foreign  currency in
which a security  is  denominated  increases  or  declines  in relation to the
value  of the  US  dollar,  the  value  of the  security  in US  dollars  will
increase  or  decline  correspondingly.  The  Portfolios  will  conduct  their
foreign currency  exchange  transactions  either on a spot (i.e.,  cash) basis
at the spot  rate  prevailing  in the  foreign  exchange  market,  or  through
entering  into forward  contracts to purchase or sell  foreign  currencies.  A
forward foreign currency  contract  involves an obligation to purchase or sell
a specific  currency  at a future  date which may be any fixed  number of days
from the date of the contract  agreed upon by the  parties,  at a price set at
the time of the contract.  These contracts are traded in the interbank  market
conducted  directly  between  currency  traders  (usually  large,   commercial
banks) and their  customers.  A forward foreign  currency  contract  generally
has no deposit  requirement,  and no commissions  are charged at any stage for
trades.
         The  Portfolios  may enter into forward  foreign  currency  contracts
for two  reasons.  First,  the  Portfolios  may desire to preserve  the United
States  dollar  price of a security  when it enters  into a  contract  for the
purchase  or  sale  of a  security  denominated  in a  foreign  currency.  The
Portfolios  may  be  able  to  protect   themselves  against  possible  losses
resulting  from changes in the  relationship  between the United States dollar
and foreign  currencies  during the period  between  the date the  security is
purchased  or sold  and the  date on  which  payment  is made or  received  by
entering  into a  forward  contract  for the  purchase  or  sale,  for a fixed
amount of  dollars,  of the amount of the  foreign  currency  involved  in the
underlying security transactions.
         Second,  when the Advisor or  Subadvisor  believes  that the currency
of a particular  foreign country may suffer a substantial  decline against the
United States dollar,  the Portfolios  enter into a forward  foreign  currency
contract  to sell,  for a fixed  amount of  dollars,  the  amount  of  foreign
currency   approximating   the  value  of  some  or  all  of  the  Portfolios'
securities  denominated in such foreign currency.  The precise matching of the
forward  foreign  currency  contract  amounts and the value of the Portfolios'
securities  involved will not generally be possible  since the future value of
the securities  will change as a consequence of market  movements  between the
date the  forward  contract  is  entered  into and the  date it  matures.  The
projection  of  short-term  currency  market  movement is  difficult,  and the
successful  execution  of  this  short-term  hedging  strategy  is  uncertain.
Although  forward  foreign  currency  contracts  tend to minimize  the risk of
loss due to a decline  in the value of the hedged  currency,  at the same time
they tend to limit any  potential  gain which might result should the value of
such  currency  increase.  The  Portfolios  do not  intend to enter  into such
forward contracts under this circumstance on a regular or continuous basis.
         Eurocurrency  Conversion  Risk.  European  countries that are members
of the  European  Monetary  Union have agreed to use a common  currency  unit,
the "euro,"  beginning in 1999.  Currently,  each of these  countries  has its
own currency  unit.  Although the Advisor and  Subadvisors  do not  anticipate
any problems in conversion  from the old currencies to the euro,  there may be
issues  involved  in  settlement,  valuation,  and  numerous  other areas that
could impact the  Portfolios.  Calvert has been  reviewing all of its computer
systems for  Eurocurrency  conversion  compliance.  There can be no  assurance
that  there  will  be no  negative  impact  on the  Portfolios,  however,  the
Advisor,  Subadvisor and custodian have advised the Portfolios  that they have
been actively  working on any necessary  changes to their computer  systems to
prepare  for the  conversion,  and  expect  that their  systems,  and those of
their outside service providers, will be adapted in time for that event.

Foreign Money Market Instruments
         The Money Market  Portfolio  may invest  without  limitation in money
market   instruments  of  banks,   whether  foreign  or  domestic,   including
obligations  of US  branches  of  foreign  banks  ("Yankee"  instruments)  and
obligations of foreign branches of US banks  ("Eurodollar"  instruments).  All
such  instruments  must be high-quality,  US  dollar-denominated  obligations.
Although  these  instruments  are not subject to foreign  currency  risk since
they  are  US   dollar-denominated,   investments   in  foreign  money  market
instruments  may  involve  risks  that  are  different  than   investments  in
securities of US issuers. See "Foreign Securities" above.

TRACKING THE INDEX - MANAGED INDEX PORTFOLIO
         The  Subadvisor  expects a  tracking  error over time of no more than
2.5%,  although there can be no guarantee  such results will be achieved.  The
process  used by the  Portfolio  to  attempt  to track the Index  within  this
limit relies on assessing the difference  between the Portfolio's  exposure to
factors  which  influence  returns  and the  Index's  exposure  to those  same
factors.  The  combined  variability  of  these  factors  and the  correlation
between  factors are used to estimate  the risk in the  Portfolio.  The extent
to which the total risk  characteristics  of the  Portfolio  vary from that of
the Index is active risk or tracking error.
         The  Portfolio's  ability  to track the index  will be  monitored  by
analyzing  returns to ensure that the returns are reasonably  consistent  with
Index returns.  By regressing  Portfolio  returns  against Index returns,  the
Advisor can calculate the goodness of fit, as measured by the  Coefficient  of
Determination  or R  -squared.  Values in excess of 90%  indicate  a very high
degree of  correlation  between the  Portfolio  and the Index.  The  Portfolio
will  also be  monitored  to ensure  those  general  characteristics,  such as
sector  exposures,  capitalization  and  valuation  criteria,  are  relatively
consistent over time.
         Any  deviations  of  realized  returns  from the  Index  which are in
excess of those  expected  will be  analyzed  for sources of  variance.  Where
variations  are  deemed  to be  systematic  or  associated  with a  particular
feature  of  the  investment   process,   the  constraints  on  the  Portfolio
associated  with that  factor  may be  adjusted  to ensure a higher  degree of
correlation to the Index.

TEMPORARY DEFENSIVE POSITIONS
         For  temporary  defensive  purposes  - which  may  include  a lack of
adequate purchase  candidates or an unfavorable  market environment - the Fund
may invest in cash or cash equivalents.  Cash equivalents  include instruments
such  as,  but  not  limited  to,  US  government   and  agency   obligations,
certificates  of  deposit,  banker's  acceptances,  time  deposits  commercial
paper, short-term corporate debt securities, and repurchase agreements.

Repurchase Agreements
         The  Fund  may  purchase  debt   securities   subject  to  repurchase
agreements,  which are arrangements under which the Fund buys a security,  and
the seller  simultaneously  agrees to  repurchase  the security at a specified
time and price  reflecting  a market  rate of  interest.  The Fund  engages in
repurchase  agreements  in order to earn a higher rate of return than it could
earn  simply  by  investing  in the  obligation  which is the  subject  of the
repurchase agreement.  Repurchase  agreements are not, however,  without risk.
In the event of the  bankruptcy  of a seller  during the term of a  repurchase
agreement,  a legal  question  exists as to  whether  the Fund would be deemed
the  owner  of the  underlying  security  or would  be  deemed  only to have a
security  interest in and lien upon such  security.  The Fund will only engage
in  repurchase   agreements  with  recognized  securities  dealers  and  banks
determined to present  minimal  credit risk by the Advisor under the direction
and  supervision of the Fund's Board of Trustees.  In addition,  the Fund will
only engage in  repurchase  agreements  reasonably  designed  to secure  fully
during the term of the  agreement the seller's  obligation  to repurchase  the
underlying  security  and will  monitor  the  market  value of the  underlying
security  during  the term of the  agreement.  If the value of the  underlying
security  declines and is not at least equal to the  repurchase  price due the
Fund  pursuant to the  agreement,  the Fund will  require the seller to pledge
additional  securities or cash to secure the seller's  obligations pursuant to
the  agreement.  If the seller  defaults on its  obligation to repurchase  and
the value of the underlying  security declines,  the Fund may incur a loss and
may incur expenses in selling the underlying security.  Repurchase  agreements
are  always  for  periods  of less than one year.  Repurchase  agreements  not
terminable within seven days are considered illiquid.

Reverse Repurchase Agreements
         The Fund may also engage in reverse  repurchase  agreements.  Under a
reverse repurchase  agreement,  the Fund sells portfolio  securities to a bank
or  securities  dealer and agrees to  repurchase  those  securities  from such
party at an agreed upon date and price  reflecting  a market rate of interest.
The Fund  invests the  proceeds  from each  reverse  repurchase  agreement  in
obligations  in which it is  authorized  to invest.  The Fund intends to enter
into a reverse  repurchase  agreement only when the interest  income  provided
for in the  obligation  in which the Fund  invests the proceeds is expected to
exceed  the  amount the Fund will pay in  interest  to the other  party to the
agreement plus all costs associated with the  transactions.  The Fund does not
intend  to  borrow  for  leverage  purposes.   The  Portfolios  will  only  be
permitted to pledge assets to the extent  necessary to secure  borrowings  and
reverse repurchase agreements.
         During the time a reverse  repurchase  agreement is outstanding,  the
Fund will  maintain in a segregated  custodial  account an amount of cash,  US
Government  securities or other liquid,  high-quality debt securities equal in
value to the  repurchase  price.  The Fund will  mark to  market  the value of
assets held in the segregated  account,  and will place  additional  assets in
the account  whenever  the total  value of the account  falls below the amount
required under applicable regulations.
         The Fund's use of reverse  repurchase  agreements  involves  the risk
that the other party to the  agreements  could become subject to bankruptcy or
liquidation  proceedings during the period the agreements are outstanding.  In
such  event,  the Fund may not be able to  repurchase  the  securities  it has
sold to that other party. Under those  circumstances,  if at the expiration of
the  agreement  such  securities  are  of  greater  value  than  the  proceeds
obtained by the Fund under the  agreements,  the Fund may have been better off
had it not  entered  into the  agreement.  However,  the Fund will  enter into
reverse  repurchase  agreements  only with banks and dealers which the Advisor
believes present minimal credit risks under  guidelines  adopted by the Fund's
Board of  Trustees.  In  addition,  the Fund  bears the risk  that the  market
value of the securities it sold may decline below the  agreed-upon  repurchase
price,  in which  case the  dealer  may  request  the Fund to post  additional
collateral.

Non-Investment Grade Debt Securities
         Non-investment   grade  debt   securities   are  lower  quality  debt
securities  (generally  those  rated  BB or  lower  by S&P or Ba or  lower  by
Moody's,  known  as "junk  bonds."  These  securities  have  moderate  to poor
protection   of  principal   and  interest   payments  and  have   speculative
characteristics.  (See  Appendix  for a  description  of the  ratings.)  These
securities  involve  greater risk of default or price  declines due to changes
in  the  issuer's  creditworthiness  than  investment-grade  debt  securities.
Because the market for  lower-rated  securities may be thinner and less active
than for  higher-rated  securities,  there may be market price  volatility for
these  securities and limited  liquidity in the resale  market.  Market prices
for  these  securities  may  decline   significantly  in  periods  of  general
economic  difficulty or rising  interest  rates.  Unrated debt  securities may
fall into the lower  quality  category.  Unrated  securities  usually  are not
attractive  to as many  buyers as rated  securities  are,  which may make them
less marketable.
         The quality  limitation set forth in the Fund's  investment policy is
determined  immediately  after the  Fund's  acquisition  of a given  security.
Accordingly,  any  later  change  in  ratings  will  not  be  considered  when
determining whether an investment complies with the Fund's investment policy.
         When  purchasing  non-investment  grade  debt  securities,  rated  or
unrated,  the Advisors  prepare their own careful  credit  analysis to attempt
to  identify  those  issuers  whose  financial  condition  is adequate to meet
future  obligations  or is expected  to be  adequate  in the  future.  Through
portfolio  diversification  and  credit  analysis,   investment  risk  can  be
reduced, although there can be no assurance that losses will not occur.

DERIVATIVES
         The Fund can use various  techniques  to  increase  or  decrease  its
exposure to changing  security  prices,  interest rates, or other factors that
affect security values.  These techniques may involve derivative  transactions
such as buying  and  selling  options  and  futures  contracts  and  leveraged
notes, entering into swap agreements,  and purchasing indexed securities.  The
Fund can use these practices  either as substitution or as protection  against
an adverse move in the Fund to adjust the risk and return  characteristics  of
the  Fund.  If  the  Advisor  and/or   Subadvisor   judges  market  conditions
incorrectly  or employs a strategy that does not correlate  well with a Fund's
investments,  or if the  counterparty to the  transaction  does not perform as
promised,  these  techniques  could  result in a loss.  These  techniques  may
increase the  volatility of a Fund and may involve a small  investment of cash
relative  to  the  magnitude  of  the  risk  assumed.  Derivatives  are  often
illiquid.

Options and Futures Contracts (NOT APPLICABLE TO MONEY MARKET)
         The  Portfolios  may,  in  pursuit  of  their  respective  investment
objectives,  purchase  put and call  options  and  engage  in the  writing  of
covered  call  options and secured  put options on  securities  which meet the
Fund's social criteria,  and employ a variety of other investment  techniques.
Specifically,  these  Portfolios  may also engage in the  purchase and sale of
stock index future  contracts,  foreign currency futures  contracts,  interest
rate futures contracts,  and options on such futures,  as described more fully
below.
         These  Portfolios may engage in such  transactions  only to hedge the
existing  positions in the respective  Portfolios  (or for Managed Index,  for
liquidity  or  to  hedge  cash  exposure).   They  will  not  engage  in  such
transactions  for the purposes of  speculation  or leverage.  Such  investment
policies  and  techniques  may  involve  a greater  degree of risk than  those
inherent in more conservative investment approaches.
         These  Portfolios  may  write  "covered  options"  on  securities  in
standard contracts traded on national securities  exchanges.  These Portfolios
may write such  options in order to receive the  premiums  from  options  that
expire and to seek net gains from closing purchase  transactions  with respect
to such options.

Put and Call Options.  These Portfolios may purchase put and call options,  in
standard contracts traded on national securities  exchanges,  on securities of
issuers  which  meet  the  Fund's  social  criteria.   These  Portfolios  will
purchase  such  options  only  to  hedge  against  changes  in  the  value  of
securities  the  Portfolios  hold and not for the purposes of  speculation  or
leverage.  By buying a put, a Portfolio  has the right to sell the security at
the exercise  price,  thus  limiting its risk of loss through a decline in the
market  value  of the  security  until  the put  expires.  The  amount  of any
appreciation  in the  value  of the  underlying  security  will  be  partially
offset by the amount of the  premium  paid for the put option and any  related
transaction  costs.  Prior to its  expiration,  a put  option may be sold in a
closing sale  transaction  and any profit or loss from the sale will depend on
whether  the amount  received  is more or less than the  premium  paid for the
put option plus the related transaction costs.
         These  Portfolios may purchase call options on securities  which they
may  intend to  purchase  and which  meet the  Fund's  social  criteria.  Such
transactions  may be entered into in order to limit the risk of a  substantial
increase in the market price of the security which the  Portfolios  intends to
purchase.  Prior to its  expiration,  a call  option  may be sold in a closing
sale  transaction.  Any profit or loss from such a sale will depend on whether
the  amount  received  is more or less  than  the  premium  paid  for the call
option plus the related transaction costs.

Covered  Options.  These  Portfolios may write only covered  options on equity
and debt  securities  in  standard  contracts  traded on  national  securities
exchanges.  This  means  that,  in the  case  of  call  options,  so long as a
Portfolio is obligated as the writer of a call  option,  that  Portfolio  will
own the  underlying  security  subject to the option  and,  in the case of put
options,  that Portfolio  will,  through its  custodian,  deposit and maintain
either cash or  securities  with a market  value equal to or greater  than the
exercise price of the option.
         When a Portfolio  writes a covered call option,  the Portfolio  gives
the  purchaser  the right to purchase the security at the call option price at
any time  during  the life of the  option.  As the writer of the  option,  the
Portfolio  receives a premium,  less a  commission,  and in exchange  foregoes
the  opportunity  to  profit  from any  increase  in the  market  value of the
security  exceeding the call option price.  The premium serves to mitigate the
effect  of any  depreciation  in the  market  value of the  security.  Writing
covered  call  options  can  increase  the  income of the  Portfolio  and thus
reduce  declines  in the  net  asset  value  per  share  of the  Portfolio  if
securities  covered  by such  options  decline  in value.  Exercise  of a call
option by the  purchaser  however will cause the  Portfolio  to forego  future
appreciation of the securities covered by the option.
         When a Portfolio  writes a covered put option,  it will gain a profit
in the amount of the premium,  less a commission,  so long as the price of the
underlying security remains above the exercise price.  However,  the Portfolio
remains  obligated to purchase the  underlying  security from the buyer of the
put option  (usually  in the event the price of the  security  falls below the
exercise  price) at any time  during  the option  period.  If the price of the
underlying  security  falls  below  the  exercise  price,  the  Portfolio  may
realize a loss in the amount of the  difference  between  the  exercise  price
and the sale price of the security, less the premium received.
         These  Portfolios may purchase  securities  which may be covered with
call  options  solely  on the  basis  of  considerations  consistent  with the
investment  objectives  and policies of the Fund and the  affected  Portfolio.
The Portfolio's  turnover may increase  through the exercise of a call option;
this  will  generally  occur  if the  market  value  of a  "covered"  security
increases  and  the  portfolio  has  not  entered  into  a  closing   purchase
transaction.
         Risks Related to Options  Transactions.  The Portfolios can close out
their  respective  positions  in  exchange-traded  options only on an exchange
which provides a secondary  market in such options.  Although these Portfolios
intend to acquire  and write only such  exchange-traded  options  for which an
active  secondary  market  appears to exist,  there can be no  assurance  that
such  a  market  will  exist  for  any  particular   option  contract  at  any
particular  time.  This might prevent the  Portfolios  from closing an options
position,  which could impair the  Portfolios'  ability to hedge  effectively.
The  inability  to close out a call  position  may have an  adverse  effect on
liquidity  because  the  Portfolio  may be  required  to hold  the  securities
underlying the option until the option expires or is exercised.

Futures   Transactions.   These  Portfolios  may  purchase  and  sell  futures
contracts,  but only when,  in the  judgment of the  Advisor,  such a position
acts as a hedge  against  market  changes  which  would  adversely  affect the
securities held by the Portfolios.  These futures  contracts may include,  but
are not limited to,  market  index  futures  contracts  and futures  contracts
based on US Government obligations.
         A futures  contract  is an  agreement  between two parties to buy and
sell a security  on a future  date which has the  effect of  establishing  the
current  price for the  security.  Although  futures  contracts by their terms
require  actual  delivery  and  acceptance  of  securities,  in most cases the
contracts  are closed out before the  settlement  date  without  the making or
taking of delivery of securities.  Upon buying or selling a futures  contract,
the Portfolio  deposits  initial  margin with its  custodian,  and  thereafter
daily  payments  of  maintenance  margin  are made to and  from the  executing
broker.  Payments of maintenance  margin  reflect  changes in the value of the
futures  contract,  with the Portfolio  being  obligated to make such payments
if its futures  position  becomes  less  valuable and entitled to receive such
payments if its positions become more valuable.
         These  Portfolios  may only  invest  in  futures  contracts  to hedge
their   respective   existing   investment   positions   and  not  for  income
enhancement,   speculation  or  leverage   purposes.   Although  some  of  the
securities  underlying a futures  contract may not necessarily meet the Fund's
social  criteria,  any such hedge position taken by these  Portfolios will not
constitute a direct ownership interest in the underlying securities.
         Futures   contracts  are  designed  by  boards  of  trade  which  are
designated  "contracts  markets" by the Commodity  Futures Trading  Commission
("CFTC").  As series of a registered  investment  company,  the Portfolios are
eligible  for  exclusion  from  the  CFTC's   definition  of  "commodity  pool
operator,"  meaning that the Portfolios may invest in futures  contracts under
specified  conditions  without  registering with the CFTC.  Futures  contracts
trade on  contracts  markets  in a manner  that is  similar to the way a stock
trades on a stock  exchange and the boards of trade,  through  their  clearing
corporations, guarantee performance of the contracts.

Options on Futures  Contracts.  These Portfolios may purchase and write put or
call options and sell call  options on futures  contracts in which a Portfolio
could  otherwise  invest  and which are  traded on a US  exchange  or board of
trade.  The Portfolios may also enter into closing  transactions  with respect
to such  options to  terminate  an existing  position;  that is, to sell a put
option  already  owned and to buy a call option to close a position  where the
Portfolio has already sold a corresponding call option.
         The  Portfolios  may only invest in options on futures  contracts  to
hedge  their  respective  existing  investment  positions  and not for  income
enhancement,   speculation  or  leverage   purposes.   Although  some  of  the
securities  underlying  the  futures  contract  underlying  the option may not
necessarily  meet the Fund's social  criteria,  any such hedge  position taken
by these  Portfolios  will not constitute a direct  ownership  interest in the
underlying securities.
         An option on a futures  contract  gives the purchaser  the right,  in
return for the  premium  paid,  to assume a position  in a futures  contract-a
long  position  if the option is a call and a short  position if the option is
a put-at a  specified  exercise  price at any time  during  the  period of the
option.  The  Portfolios  will pay a premium  for such  options  purchased  or
sold. In connection  with such options  bought or sold,  the  Portfolios  will
make initial margin deposits and make or receive  maintenance  margin payments
which reflect  changes in the market value of such options.  This  arrangement
is  similar  to  the  margin  arrangements  applicable  to  futures  contracts
described above.

Put  Options on Futures  Contracts.  The  purchase  of put  options on futures
contracts  is  analogous  to the  sale  of  futures  contracts  and is used to
protect  the  portfolios   against  the  risk  of  declining   prices.   These
Portfolios   may  purchase  put  options  and  sell  put  options  on  futures
contracts that are already owned by that  Portfolio.  The Portfolios will only
engage in the  purchase  of put options and the sale of covered put options on
market index futures for hedging purposes.

Call  Options  on  Futures  Contracts.  The sale of call  options  on  futures
contracts  is  analogous  to the  sale  of  futures  contracts  and is used to
protect the portfolios  against the risk of declining prices.  The purchase of
call  options on futures  contracts  is analogous to the purchase of a futures
contract.  These  Portfolios  may only buy call  options to close an  existing
position  where the  Portfolio has already sold a  corresponding  call option,
or for a cash  hedge.  The  Portfolios  will  only  engage in the sale of call
options and the purchase of call options to cover for hedging purposes.

Writing  Call  Options on Futures  Contracts.  The writing of call  options on
futures  contracts  constitutes a partial hedge  against  declining  prices of
the  securities  deliverable  upon  exercise of the futures  contract.  If the
futures  contract  price  at  expiration  is below  the  exercise  price,  the
Portfolios  will retain the full amount of the option  premium which  provides
a  partial   hedge   against  any  decline  that  may  have  occurred  in  the
Portfolio's securities holdings.

Risks of Options and Futures  Contracts.  If one of these  Portfolios has sold
futures or takes options  positions to hedge its portfolio  against decline in
the market and the market later  advances,  the Portfolio may suffer a loss on
the futures  contracts or options  which it would not have  experienced  if it
had  not  hedged.  Correlation  is also  imperfect  between  movements  in the
prices of futures  contracts and movements in prices of the  securities  which
are the  subject  of the  hedge.  Thus the price of the  futures  contract  or
option  may move  more than or less  than the  price of the  securities  being
hedged.  Where a Portfolio  has sold  futures or taken  options  positions  to
hedge against  decline in the market,  the market may advance and the value of
the securities held in the Portfolio may decline.  If this were to occur,  the
Portfolio  might  lose money on the  futures  contracts  or  options  and also
experience  a  decline  in the  value of its  portfolio  securities.  However,
although  this  might  occur  for a brief  period or to a slight  degree,  the
value of a  diversified  portfolio  will tend to move in the  direction of the
market generally.
         The  Portfolios  can close out futures  positions only on an exchange
or  board  of  trade  which  provides  a  secondary  market  in such  futures.
Although  the  Portfolios  intend to  purchase  or sell only such  futures for
which an active secondary  market appears to exist,  there can be no assurance
that such a market  will  exist for any  particular  futures  contract  at any
particular  time.  This might  prevent the  Portfolios  from closing a futures
position,  which could  require a Portfolio to make daily cash  payments  with
respect to its position in the event of adverse price movements.
         Options on futures  transactions  bear several risks apart from those
inherent in options transactions  generally.  The Portfolios' ability to close
out their options  positions in futures  contracts will depend upon whether an
active  secondary  market for such options develops and is in existence at the
time the Portfolios seek to close their  positions.  There can be no assurance
that such a market will develop or exist.  Therefore,  the Portfolios might be
required to exercise the options to realize any profit.

LENDING PORTFOLIO SECURITIES
         The  Portfolios  may lend its  securities  to member firms of the New
York Stock  Exchange and commercial  banks with assets of one billion  dollars
or more.  Any such loans must be secured  continuously  in the form of cash or
cash  equivalents  such as US  Treasury  bills.  The amount of the  collateral
must on a  current  basis  equal or  exceed  the  market  value of the  loaned
securities,  and the  Portfolios  must be able to  terminate  such  loans upon
notice at any time.  The  Portfolios  will exercise their right to terminate a
securities  loan in order to  preserve  their  right to vote upon  matters  of
importance affecting holders of the securities.
         The  advantage  of such  loans is that the  Portfolios  continues  to
receive  the  equivalent  of the  interest  earned  or  dividends  paid by the
issuers on the loaned  securities  while at the same time earning  interest on
the cash or equivalent  collateral  which may be invested in  accordance  with
the Portfolios' investment objective, policies and restrictions.
         Securities  loans  are  usually  made  to  broker-dealers  and  other
financial  institutions to facilitate  their delivery of such  securities.  As
with any  extension  of credit,  there may be risks of delay in  recovery  and
possibly  loss of rights in the loaned  securities  should the borrower of the
loaned  securities fail financially.  However,  the Portfolios will make loans
of their  securities  only to those  firms the  Advisor  or  Subadvisor  deems
creditworthy  and only on terms the Advisor  believes  should  compensate  for
such risk.  On  termination  of the loan,  the borrower is obligated to return
the  securities to the  Portfolio.  The Portfolio  will  recognize any gain or
loss in the  market  value  of the  securities  during  the loan  period.  The
Portfolio may pay reasonable custodial fees in connection with the loan.

- ------------------------------------------------------------------------------
                           INVESTMENT RESTRICTIONS
- ------------------------------------------------------------------------------

Fundamental Investment Restrictions
         Each  Portfolio  has adopted  the  following  fundamental  investment
restrictions.  These  restrictions  cannot be changed  without the approval of
the  holders  of  a  majority  of  the  outstanding  shares  of  the  affected
Portfolio.

         (1)  CSIF  Money  market,  Balanced,   Equity,  and  Managed
         Index:   Each   Portfolio   may  not  make  any   investment
         inconsistent  with  its   classification  as  a  diversified
         investment company under the 1940 Act.
         (2)  CSIF  Bond:  CSIF  Bond  Portfolio  may  not  make  any
         investment   inconsistent  with  its   classification  as  a
         nondiversified investment company under the 1940 Act.
         (3) No Portfolio  may  concentrate  its  investments  in the
         securities of issuers  primarily  engaged in any  particular
         industry  (other than  securities  issued or  guaranteed  by
         the US Government or its agencies or  instrumentalities  and
         repurchase  agreements secured thereby),  or, for CSIF Money
         Market, domestic bank money market instruments.
         (4) No  Portfolio  may  issue  senior  securities  or borrow
         money,   except  from  banks  for   temporary  or  emergency
         purposes  and then  only in an  amount  up to 33 1/3% of the
         value of a  Portfolio's  total assets or as permitted by law
         and except by  engaging  in reverse  repurchase  agreements,
         where allowed.  In order to secure any permitted  borrowings
         and reverse  repurchase  agreements under this section,  the
         affected  Portfolio may pledge,  mortgage or hypothecate its
         assets.
         (4) No Portfolio  may  underwrite  the  securities  of other
         issuers,  except as  allowed  by law or to the  extent  that
         the   purchase  of   obligations   in   accordance   with  a
         Portfolio's   investment  objective  and  policies,   either
         directly  from the  issuer,  or from an  underwriter  for an
         issuer, may be deemed an underwriting.
         (5) No  Portfolio  may invest  directly  in  commodities  or
         real estate,  although a Portfolio  may invest in securities
         which are secured by real  estate or real  estate  mortgages
         and   securities   of  issuers   which  invest  or  deal  in
         commodities,  commodity futures,  real estate or real estate
         mortgages.
         (6) No  Portfolio  may make  loans,  other than  through the
         purchase  of  money  market   instruments   and   repurchase
         agreements  or by  the  purchase  of  bonds,  debentures  or
         other  debt   securities,   or  as  permitted  by  law.  The
         purchase  of all or a  portion  of an issue of  publicly  or
         privately  distributed  debt  obligations in accordance with
         a   Portfolio's    investment   objective,    policies   and
         restrictions, shall not constitute the making of a loan.

Nonfundamental Investment Restrictions
         The  Board of  Trustees  has  adopted  the  following  nonfundamental
investment  restrictions.  A  nonfundamental  investment  restriction  can  be
changed by the Board at any time without a shareholder vote.

Money Market Portfolio may not:
         (1)  Purchase the  obligations  of foreign  issuers  (except
         foreign  money  market   instruments   that  are  US  dollar
         denominated).
         (2)  Purchase  illiquid  securities  if more than 10% of the
         value of the  Portfolio's  net assets  would be  invested in
         such securities.
         (3)  Make  short  sales  of   securities   or  purchase  any
         securities on margin.
         (4)  Write,  purchase  or sell puts,  calls or  combinations
         thereof.
         (5)  Enter  into  reverse  repurchase  agreements  if  the  aggregate
         proceeds from outstanding reverse repurchase  agreements,  when added
         to other  outstanding  borrowings  permitted  by the 1940 Act,  would
         exceed  33 1/3% of its  total  assets.  CSIF  Money  Market  does not
         intend to make any purchases of  securities  if borrowing  exceeds 5%
         of its total assets.

Balanced, Equity, and Bond Portfolios may not:
         (1) Purchase  the  obligations  of foreign  issuers if, as a
         result,  such  securities  would  exceed 25% of the value of
         the Portfolio's assets.
         (2)  Purchase  illiquid  securities  if more than 15% of the
         value of that  Portfolio's  net assets  would be invested in
         such securities.
         (3)  Make  short  sales  of   securities   or  purchase  any
         securities  on margin  except as  provided  with  respect to
         options,   futures   contracts,   and   options  on  futures
         contracts.
         (4)  Enter  into  a  futures  contract  or  an  option  on a  futures
         contract if the aggregate  initial  margins and premiums  required to
         establish  these  positions  would exceed 5% of the  Portfolio's  net
         assets.
         (5)  Enter  into  reverse  repurchase  agreements  if  the  aggregate
         proceeds from outstanding reverse repurchase  agreements,  when added
         to other  outstanding  borrowings  permitted  by the 1940 Act,  would
         exceed 33 1/3% of a Portfolio's  total assets.  No Portfolio  intends
         to make any purchases of  securities  if borrowing  exceeds 5% of its
         total assets.
         (6)  Purchase  a put  or  call  option  on a  security  (including  a
         straddle  or  spread)  if the  value  of that  option  premium,  when
         aggregated  with the  premiums  on all other  options  on  securities
         held by the  Portfolio,  would  exceed  5% of the  Portfolio's  total
         assets.

Index Portfolio may not:
         (1) Purchase the obligations of foreign issuers.
         (2)  Purchase  illiquid  securities  if more than 15% of the value of
         the Portfolio's net assets would be invested in such securities.
         (3) Purchase debt securities (other than money market instruments).
         (4)  Enter  into  a  futures  contract  or  an  option  on a  futures
         contract if the aggregate  initial  margins and premiums  required to
         establish  these  positions  would exceed 5% of the  Portfolio's  net
         assets.
         (5)  Make  short  sales  of   securities   or  purchase  any
         securities  on margin  except as  provided  with  respect to
         options,   futures   contracts   and   options   on  futures
         contracts.
         (6) Purchase a put or call option on a security (including a
         straddle or spread) if the value of that option premium, when
         aggregated with the premiums on all other options on securities
         held by the Portfolio, would exceed 5% of the Portfolio's total
         assets.
         (7)  Enter  into  reverse  repurchase  agreements  if  the  aggregate
         proceeds from outstanding reverse repurchase  agreements,  when added
         to other  outstanding  borrowings  permitted  by the 1940 Act,  would
         exceed 33 1/3% of the  Portfolio's  total assets.  The Portfolio does
         not intend to make any purchases of  securities if borrowing  exceeds
         5% of its total assets.

         Any investment  restriction  which  involves a maximum  percentage of
securities or assets shall not be  considered to be violated  unless an excess
over the  applicable  percentage  occurs  immediately  after an acquisition of
securities or utilization of assets and results therefrom.

- ------------------------------------------------------------------------------
                         INVESTMENT SELECTION PROCESS
- ------------------------------------------------------------------------------

         Investments  in the Fund are  selected on the basis of their  ability
to contribute  to the dual  objective of the Fund,  (i.e.,  those that satisfy
the Fund's  investment and social  criteria).  The Fund has developed a number
of  techniques  for  evaluating  the  performance  of issuers in each of these
areas.  The  primary  sources of  information  are  reports  published  by the
issuers  themselves,  the  reports  of public  agencies,  and the  reports  of
groups  which  monitor  performance  in  particular  areas.  These  sources of
information  are  sometimes   augmented  with  direct  interviews  or  written
questionnaires  addressed to the issuers.  It should be  recognized,  however,
that there are few generally  accepted  measures by which achievement in these
areas can be readily  distinguished;  therefore,  the  development of suitable
measurement  techniques is largely  within the  discretion and judgment of the
Advisors of the Fund.
         Candidates for inclusion in any  particular  class of assets are then
examined  according to the social criteria.  Issuers are classified into three
categories of  suitability  under the social  criteria.  In the first category
are  those  issuers,  which  exhibit  unusual  positive   accomplishment  with
respect  to some of the  criteria  and do not fail to meet  minimum  standards
with  respect to the  remaining  criteria.  To the greatest  extent  possible,
investment  selections  are made from this group.  In the second  category are
those issuers,  which meet minimum  standards with respect to all the criteria
but do not exhibit  outstanding  accomplishment with respect to any criterion.
This  category  includes  issuers  which  may lack an  affirmative  record  of
accomplishment  in these  areas but which are not known by Advisors to violate
any of the social  criteria.  The third  category  under the  social  criteria
consists of issuers who flagrantly violate,  or have violated,  one or more of
those  values,  for example,  a company,  which  repeatedly  engages in unfair
labor  practices.  The Fund will not  knowingly  purchase  the  securities  of
issuers in this third category.
         It should be noted  that the  Fund's  social  criteria  tend to limit
the  availability  of  investment  opportunities  more than is customary  with
other investment  companies.  The Advisors of the Fund, however,  believe that
within  the first  and  second  categories  there  are  sufficient  investment
opportunities  to permit full  investment  among  issuers,  which  satisfy the
Fund's social investment objective.
         To the greatest extent  possible,  the Advisors apply the same social
criteria to the  purchase  of  non-equity  securities  as it applies to equity
investments.   With  respect  to  government  securities,   the  Money  Market
Portfolio  invests  primarily  in debt  obligations  issued or  guaranteed  by
agencies  or  instrumentalities  of  the  Federal  Government  whose  purposes
further  or  are  compatible  with  the  Fund's  social   criteria,   such  as
obligations  of the Bank  for  Cooperatives  and the  Student  Loan  Marketing
Association,  rather than general obligations of the Federal Government,  such
as  Treasury  securities.  Bank  certificates  of deposit,  commercial  paper,
repurchase  agreements,  and  corporate  bonds are judged in the same way as a
prospective  purchase of the bank's or issuing  company's  common  stock.  The
Fund may  invest,  however,  in  certificates  of deposit of banks and savings
and loan  associations  in which the Fund would not otherwise  invest  because
such  institutions  have assets of $1 billion or less,  but generally  only to
the extent all such  investments  are fully  insured  as to  principal  by the
Federal Deposit Insurance Corporation.
         Obligations  issued by the US  Treasury,  such as US Treasury  bills,
notes  and  bonds,  are  supported  by the full  faith  and  credit  of the US
Government.  Certain  obligations  issued or  guaranteed  by an US  Government
agency or  instrumentality  are  supported by the full faith and credit of the
US Government.  These include  obligations  issued by the Export-Import  Bank,
Farmers  Home  Administration,   Government  National  Mortgage   Association,
Postal Service,  Merchant  Marine,  and Washington  Metropolitan  Area Transit
Authority.  The  Fund may  also  invest  in  other  US  Government  agency  or
instrumentality  obligations,  which are  supported  only by the credit of the
agency or  instrumentality  and may be further  supported  by the right of the
issuer to borrow from the US Treasury.  Such  obligations  include  securities
issued  by the  Bank  for  Cooperatives,  Federal  Intermediate  Credit  Bank,
Federal  Land  Bank,  Federal  Home Loan  Bank,  Federal  Home  Loan  Mortgage
Corporation, and Federal National Mortgage Association.

- ------------------------------------------------------------------------------
                      DIVIDENDS, DISTRIBUTIONS AND TAXES
- ------------------------------------------------------------------------------

         The Funds  intend to  continue  to  qualify as  regulated  investment
companies under  Subchapter M of the Internal  Revenue Code. If for any reason
the Fund  should fail to qualify,  it would be taxed as a  corporation  at the
Fund level, rather than passing through its income and gains to shareholders.
         Distributions  of realized  net capital  gains,  if any, are normally
paid  once a year;  however,  the  Fund  does  not  intend  to make  any  such
distributions  unless  available  capital loss  carryovers,  if any, have been
used or have  expired.  Capital loss  carryforwards  as of September 30, 1998,
for the Money Market  Portfolio was $29,000,  Managed Growth Portfolio was $0,
Bond  Portfolio was $0, Equity  Portfolio was $0, and Managed Index  Portfolio
was $0.
         Generally,   dividends  (including   short-term  capital  gains)  and
distributions  are  taxable  to the  shareholder  in the year  they are  paid.
However,  any dividends and distributions  paid in January but declared during
the prior three months are taxable in the year declared.
         The Fund is  required  to withhold  31% of any  reportable  dividends
and  long-term  capital  gain  distributions  paid and 31% of each  reportable
redemption  transaction  occurring in the Balanced,  Equity, Bond, and Managed
Index  Portfolios if: (a) the  shareholder's  social  security number or other
taxpayer  identification  number  ("TIN")  is  not  provided  or an  obviously
incorrect  TIN is  provided;  (b)  the  shareholder  does  not  certify  under
penalties of perjury that the TIN  provided is the  shareholder's  correct TIN
and that the  shareholder is not subject to backup  withholding  under section
3406(a)(1)(C)  of  the  Internal   Revenue  Code  because  of   underreporting
(however,  failure to provide  certification  as to the application of section
3406(a)(1)(C)  will result only in backup  withholding  on  dividends,  not on
redemptions);  or (c) the Fund is notified  by the  Internal  Revenue  Service
that the TIN provided by the  shareholder  is incorrect or that there has been
underreporting   of  interest  or  dividends  by  the  shareholder.   Affected
shareholders will receive  statements at least annually  specifying the amount
withheld.
         In addition,  the Fund is required to report to the Internal  Revenue
Service  the   following   information   with   respect  to  each   redemption
transaction   occurring   in  the  Fund  (not   applicable   to  Money  Market
Portfolio):  (a) the shareholder's name, address,  account number and taxpayer
identification  number;  (b) the total  dollar value of the  redemptions;  and
(c) the Fund's identifying CUSIP number.
         Certain   shareholders   are,   however,   exempt   from  the  backup
withholding and broker reporting  requirements.  Exempt shareholders  include:
corporations;  financial institutions;  tax-exempt  organizations;  individual
retirement   plans;  the  US,  a  State,  the  District  of  Columbia,   a  US
possession,  a  foreign  government,  an  international  organization,  or any
political subdivision,  agency or instrumentality of any of the foregoing;  US
registered  commodities or securities dealers;  real estate investment trusts;
registered investment  companies;  bank common trust funds; certain charitable
trusts;  foreign central banks of issue.  Non-resident aliens, certain foreign
partnerships  and foreign  corporations  are  generally  not subject to either
requirement  but may instead be subject to withholding  under sections 1441 or
1442 of the  Internal  Revenue  Code.  Shareholders  claiming  exemption  from
backup  withholding  and broker  reporting  should  call or write the Fund for
further information.
         Many states do not tax the portion of the Fund's  dividends  which is
derived  from  interest  on  US  Government  obligations.   State  law  varies
considerably   concerning  the  tax  status  of  dividends   derived  from  US
Government  obligations.  Accordingly,  shareholders  should consult their tax
advisors  about the tax status of dividends  and  distributions  from the Fund
in their respective jurisdictions.
         Dividends  paid  by  the  Fund  may be  eligible  for  the  dividends
received deduction available to corporate  taxpayers.  Information  concerning
the tax status of  dividends  and  distributions  and the amount of  dividends
withheld, if any, is mailed annually to Fund shareholders.
         Investors  should  note  that they may be  required  to  exclude  the
initial  sales  charge,  if any,  paid on the purchase of Fund shares from the
tax basis of those  shares if the shares are  exchanged  for shares of another
Calvert Group Fund within 90 days of purchase.  This requirement  applies only
to the extent that the payment of the  original  sales charge on the shares of
the Fund  causes a  reduction  in the sales  charge  otherwise  payable on the
shares of the Calvert Group Fund  acquired in the exchange,  and investors may
treat  sales  charges  excluded  from the  basis  of the  original  shares  as
incurred to acquire the new shares.

- ------------------------------------------------------------------------------
                               NET ASSET VALUE
- ------------------------------------------------------------------------------

         Shares of the Money Market  Portfolio  are issued and redeemed at the
net asset value per share of the Portfolio.  The public  offering price of the
shares of the Balanced,  Equity,  Bond,  and Managed  Index  Portfolios is the
respective  net  asset  value  per  share  (plus,  for  Class  A  shares,  the
applicable  sales  charge).  Shares of the other  Portfolios  are  redeemed at
their  respective net asset values per share,  less any applicable  contingent
deferred  sales  charge  ("CDSC").  The Money  Market  Portfolio  attempts  to
maintain a constant  net asset value of $1.00 per share;  the net asset values
of the other  Portfolios  fluctuate  based on the  respective  market value of
the  Portfolios'  investments.  The net  asset  value per share of each of the
Portfolios  is determined  every  business day as of the close of the New York
Stock Exchange  (normally  4:00 p.m.  Eastern time) and at such other times as
may be necessary or  appropriate.  The Fund does not determine net asset value
on  certain  national  holidays  or  other  days on which  the New York  Stock
Exchange is closed:  New Year's Day, Martin Luther King Day,  Presidents' Day,
Good Friday,  Memorial Day,  Independence  Day, Labor Day,  Thanksgiving  Day,
and  Christmas  Day. The  Portfolio's  net asset value per share is determined
by   dividing   the  total  net  assets  (the  value  of  its  assets  net  of
liabilities,  including  accrued  expenses  and fees) by the  number of shares
outstanding for each class.
         The  assets  of  the  Balanced,   Equity,   Bond  and  Managed  Index
Portfolios are valued as follows:  (a) securities for which market  quotations
are  readily  available  are valued at the most  recent  closing  price,  mean
between bid and asked  price,  or yield  equivalent  as  obtained  from one or
more market makers for such  securities;  (b)  securities  maturing  within 60
days may be valued at cost,  plus or minus any amortized  discount or premium,
unless the Board of  Trustees  determines  such  method not to be  appropriate
under the  circumstances;  and (c) all other  securities  and assets for which
market  quotations  are not  readily  available  will be fairly  valued by the
Advisor in good faith under the supervision of the Board of Trustees.
         The Money Market  Portfolio's  assets,  including  securities subject
to repurchase  agreements,  are normally  valued at their amortized cost which
does not take into account unrealized  capital gains or losses.  This involves
valuing  an  instrument  at  its  cost  and  thereafter  assuming  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 that would be received upon sale of the instrument.

Net Asset Value and Offering Price Per Share, as of 9/30/98

CSIF Money Market Portfolio
         ($172,738,893/172,700,524 shares)                    $1.00

CSIF Balanced Portfolio
         Net asset value per share
         ($673,906,995/20,768,354 shares)                     $32.45
         Maximum sales charge, Class A
         (4.75% of offering price)                             1.54
         Offering price per share, Class A                    $33.99

         Class B net asset value and offering price per share
         ($2,540,141/78,440 shares)                  $32.38

         Class C net asset value and offering price per share
         ($11,482,726/358,253 shares)                         $32.05

CSIF Bond Portfolio
         Net asset value per share
         ($65,806,586/3,897,466 shares)                       $16.88
         Maximum sales charge
         (3.75% of offering price)                              .63
         Offering price per share                             $17.51

         Class B net asset value and offering price per share
         ($556,972/33,081 shares)                             $16.84

         Class C net asset value and offering price per share
         ($399,075/23,697 shares)                             $16.84

CSIF Equity Portfolio
         Net asset value per share
         ($128,683,076/6,319,836 shares)                      $20.36
         Maximum sales charge, Class A
         (4.75% of offering price)                              .97
         Offering price per share, Class A                    $21.33

         Class B net asset value and offering price per share
         ($1,670,337/82,447 shares)                           $20.26

         Class C net asset value and offering price per share
         ($5,981,089/314,868 shares)                          $19.00

CSIF Managed Index Portfolio
         Net asset value per share
         ($4,400,710/324,918 shares)                          $13.54
         Maximum sales charge, Class A
         (4.75% of offering price)                              .64
         Offering price per share, Class A                    $14.18

         Class B net asset value and offering price per share
         ($974,587/72,272 shares)                             $13.48

         Class C net asset value and offering price per share
         ($397,066/29,363 shares)                             $13.52

         Class I net asset value and offering price per share
         ($14,896,813/1,100,007 shares)                       $13.54

- ------------------------------------------------------------------------------
                    CALCULATION OF YIELD AND TOTAL RETURN
- ------------------------------------------------------------------------------

Money Market Portfolio: Yield
         From  time  to  time,  the  Money  Market  Portfolio  advertises  its
"yield" and  "effective  yield."  Both yield  figures are based on  historical
earnings and are not intended to indicate future  performance.  The "yield" of
the  Money  Market  Portfolio  refers to the  actual  income  generated  by an
investment  in the  Portfolio  over a particular  base period of time.  If the
base period is less than one year,  the yield is then  "annualized."  That is,
the net change,  exclusive of capital changes,  in the value of a share during
the base period is divided by the net asset  value per share at the  beginning
of the period,  and the result is  multiplied by 365 and divided by the number
of days in the base period.  Capital changes  excluded from the calculation of
yield are:  (1)  realized  gains and losses from the sale of  securities,  and
(2) unrealized  appreciation and  depreciation.  The Money Market  Portfolio's
"effective  yield" for a seven-day  period is its annualized  compounded yield
during the period, calculated according to the following formula:

              Effective yield = (base period return + 1)365/7 -1

         The "effective yield" is calculated like yield, but assumes
reinvestment of earned income. The effective yield will be slightly higher
than the yield because of the compounding effect of this assumed
reinvestment. For the seven-day period ended September 30, 1998, the Money
Market Portfolio's yield was 4.78% and its effective yield was 4.90%.

Bond Portfolio: Yield
         The Bond  Portfolio  may also  advertise its yield from time to time.
Yield  is  calculated  separately  for  each  Class  of the  Portfolio.  Yield
quotations   are   historical   and  are  not  intended  to  indicate   future
performance.  Yield  quotations for the Bond Portfolio  refer to the aggregate
imputed  yield-to-maturity  of each of the  Portfolio's  investments  based on
the  market  value  as of the  last  day of a given  thirty-day  or  one-month
period,  less accrued expenses (net of reimbursement),  divided by the average
daily number of outstanding  shares  entitled to receive  dividends  times the
maximum  offering  price on the last day of the  period (so that the effect of
the sales  charge  is  included  in the  calculation),  compounded  on a "bond
equivalent,"  or semiannual,  basis.  The Bond  Portfolio's  yield is computed
according to the following formula:

                          Yield = 2 (a-b/cd+1)6 - 1

where  a  =  dividends  and  interest  earned  during  the  period  using  the
aggregate  imputed yield-to  maturity for each of the Portfolio's  investments
as noted above;  b = expenses  accrued for the period (net of  reimbursement);
c = the  average  daily  number of shares  outstanding  during the period that
were entitled to receive  dividends;  and d = the maximum  offering  price per
share  on the  last  day of the  period.  Using  this  calculation,  the  Bond
Portfolio's  yield for the month ended  September 30, 1998 was 5.56% for Class
A shares, 4.33% for Class B shares, and 4.56% for Class C shares.
         The  yield  of  both  the  Money  Market  and  Bond  Portfolios  will
fluctuate  in  response  to changes in  interest  rates and  general  economic
conditions,  portfolio quality,  portfolio  maturity,  and operating expenses.
Yield is not fixed or insured and  therefore  is not  comparable  to a savings
or other  similar  type of account.  Yield during any  particular  time period
should not be  considered  an  indication  of future  yield.  It is,  however,
useful in  evaluating  a  Portfolio's  performance  in meeting its  investment
objective.

Balanced,  Equity, Bond, and Managed Index Portfolios:  Total Return and Other
Quotations
         The Balanced,  Equity,  Bond,  and Managed Index  Portfolios may each
advertise  "total  return."  Total return is  calculated  separately  for each
class.  Total  return  differs from yield in that yield  figures  measure only
the  income  component  of  a  Portfolio's  investments,  while  total  return
includes  not only the effect of income  dividends  but also any change in net
asset value, or principal  amount,  during the stated period.  Total return is
computed  by taking the total  number of shares  purchased  by a  hypothetical
$1,000  investment  after  deducting any applicable  sales charge,  adding all
additional  shares purchased  within the period with reinvested  dividends and
distributions,  calculating  the  value  of  those  shares  at the  end of the
period,  and  dividing  the result by the  initial  $1,000  investment.  Note:
"Total  Return" as quoted in the  Financial  Highlights  section of the Fund's
Prospectus and Annual Report to Shareholders,  however,  per SEC instructions,
does not reflect  deduction of the sales charge,  and  corresponds  to "return
without  maximum load" (or "w/o max load") as referred to herein.  For periods
of more than one year,  the  cumulative  total return is then adjusted for the
number of  years,  taking  compounding  into  account,  to  calculate  average
annual total return during that period.
         Total return is computed according to the following formula:

                               P(1 + T)n = ERV

where P = a  hypothetical  initial  payment of $1,000;  T = total return;  n =
number of  years;  and ERV = the  ending  redeemable  value of a  hypothetical
$1,000 payment made at the beginning of the period.
         Total  return  is  historical  in  nature  and  is  not  intended  to
indicate  future   performance.   All  total  return  quotations  reflect  the
deduction of the  Portfolio's  maximum  sales  charge,  except  quotations  of
"return  without  maximum load" (or "without  CDSC") which do not deduct sales
charge,  and "actual  return,"  which  reflect  deduction  of the sales charge
only for those  periods  when a sales  charge  was  actually  imposed.  Return
without  maximum  load,  which  will be higher  than total  return,  should be
considered  only by investors,  such as participants in certain pension plans,
to whom the sales charge does not apply,  or for purposes of  comparison  only
with  comparable  figures  which also do not reflect  sales  charges,  such as
Lipper averages.
         Return  for  the   Balanced,   Bond,   Equity,   and  Managed   Index
Portfolios' shares for the periods indicated are as follows:
- ------------------------------------------------------------------------------
Periods Ended                  Class A
September 30, 1998           Total Return
                     With/Without Maximum Load
- ------------------------------------------------------------------------------
Balanced Portfolio

One Year                 0.46%       5.50%
Five Years               8.99%       10.05%
Ten Years                9.63%       10.17%
From Inception           11.15%         N/A
(October 21, 1982, for Class A)

- ------------------------------------------------------------------------------
Periods Ended                  Class B
September 30, 1998           Total Return
                         With/Without CDSC
- ------------------------------------------------------------------------------
Balanced Portfolio

One Year                 N/A         N/A
Five Years               N/A         N/A
Ten Years                N/A         N/A
From Inception           -9.85%         -5.10%
(March 31, 1998, for Class B)

- ------------------------------------------------------------------------------
Periods Ended                  Class C
September 30, 1998           Total Return
                     With/Without CDSC
- ------------------------------------------------------------------------------
Balanced Portfolio

One Year                 3.35%       4.35%
Five Years               N/A         N/A
Ten Years                N/A         N/A
From Inception           9.70%          9.70%
(March 1, 1994, for Class C)

- ------------------------------------------------------------------------------
Bond Portfolio              Class A
One Year                    4.38%     8.46%
Five Years                  4.84%     5.65%
Ten Years                   8.07%     8.48%
From Inception                N/A       N/A
(August 24, 1987, for Class A)

- ------------------------------------------------------------------------------
Bond Portfolio             Class B
One Year                   N/A        N/A
Five Years                 N/A        N/A
Ten Years                  N/A        N/A
From Inception             -0.64%     3.36%
(March 31, 1998, for Class B)

- ------------------------------------------------------------------------------
Bond Portfolio             Class C
One Year                   N/A        N/A
Five Years                 N/A        N/A
Ten Years                  N/A        N/A
From Inception             0.42%      1.75%
(June 1, 1998, for Class C)

- ------------------------------------------------------------------------------
Equity Portfolio           Class A
One Year                  -19.78%       -15.70%
Five Years                  5.72%       6.76%
Ten Years                   7.73%       8.26%
From Inception                N/A       N/A
(August 24, 1987, for Class A)

- ------------------------------------------------------------------------------
Equity Portfolio           Class B
One Year                   N/A          N/A
Five Years                 N/A          N/A
Ten Years                  N/A          N/A
From Inception             -26.11%      -22.11
(March 31, 1998, for Class B)

- ------------------------------------------------------------------------------
Equity Portfolio           Class C
One Year                   N/A          -16.47
Five Years                 N/A          N/A
Ten Years                  N/A          N/A
From Inception             -17.30%      4.97%
(March 1, 1994, for Class C)

- ------------------------------------------------------------------------------
Managed Index Portfolio             Class A
One Year                            N/A          N/A
From Inception        -14.10%      -9.73         -14.63%
(August 15, 1998, for Class A)

- ------------------------------------------------------------------------------
Managed Index Portfolio             Class B
One Year                            N/A          N/A
From Inception                     -14.63%       -10.13%
(April 15, 1998, for Class B)

- ------------------------------------------------------------------------------
Managed Index Portfolio             Class C
One Year                            N/A          N/A
From Inception                     -7.82%        -6.89%
(June 1, 1998 for Class C)

         The Class A total return figures above and the Bond  Portfolio  yield
figures  above were  calculated  using the maximum  sales  charge in effect at
that time.  CAM assumed  active  management  of the Bond  Portfolio  effective
March,  1997,  new  sub-advisors  assumed  management of the Equity  Portfolio
effective  September  1998,  and new  sub-advisors  assumed  management of the
Balanced  Portfolio  effective July,  1995.  Total return,  like yield and net
asset  value  per  share,   fluctuates   in  response  to  changes  in  market
conditions.  Neither  total  return nor yield for any  particular  time period
should be considered an indication of future return.
         The Fund may advertise an internal  rate of return  ("IRR") on direct
company holdings in its special equities program.  This is a  non-standardized
performance  calculation.  See the explanation in the "Advertising" portion of
this Statement,  below.  These direct company  holdings  represent only a very
small  portion  of a  Portfolio's  assets,  and the  IRR on  this  part of the
special  equities  program  should  not be  confused  with the yield and total
return of any particular Portfolio.

- ------------------------------------------------------------------------------
                      PURCHASE AND REDEMPTION OF SHARES
- ------------------------------------------------------------------------------

         Share  certificates  will not be issued  unless  requested in writing
by the investor.  No charge will be made for share  certificate  requests.  No
certificates  will  be  issued  for  fractional  shares  of any  Portfolio.  A
service  fee of $10,  plus any costs  incurred  by the Fund,  will be  charged
investors whose purchase checks are returned for  insufficient  funds. See the
prospectus for more details on purchases and redemptions.
         Shareholders  in the Money  Market  Portfolio  wishing to have drafts
should  complete the signature card enclosed with the Investment  Application.
Existing  shareholders  may arrange for draft writing by  contacting  the Fund
for a signature card. Other  documentation may be required from  corporations,
fiduciaries and  institutional  investors.  This draft writing service will be
subject to the customary rules and regulations  governing  checking  accounts,
and the Fund  reserves the right to change or suspend the service.  Generally,
there is no  charge  to you for the  maintenance  of this  service  or for the
clearance of drafts,  but the Fund  reserves the right to charge a service fee
for drafts  returned for  insufficient  or uncollected  funds. As a service to
shareholders,   the  Fund  may   automatically   transfer  the  dollar  amount
necessary  to cover  drafts you have  written on the Fund to your Fund account
from any  other of your  identically  registered  accounts  in  Calvert  money
market  funds or  Calvert  Insured  Plus.  The Fund may  charge a fee for this
service.
         When a payable  through draft is presented for payment,  a sufficient
number of full and fractional shares from the  shareholder's  account to cover
the  amount  of the  draft  will be  redeemed  at the  net  asset  value  next
determined.  If there are insufficient  shares in the  shareholder's  account,
the draft  may be  returned.  This  draft  writing  procedure  for  redemption
enables  shareholders  to receive the daily  dividends  declared on the shares
to be  redeemed  until such time as the draft is  presented  to the  custodian
bank  for  payment.  Drafts  presented  to the bank for  payment  which  would
require  the  redemption  of shares  purchased  by check or  electronic  funds
transfer within the previous 10 business days may not be honored.
         Redemption  proceeds are normally paid in cash.  However, at the sole
discretion  of the Fund,  the Fund has the  right to  redeem  shares in assets
other  than cash for  redemption  amounts  exceeding,  in any  90-day  period,
$250,000 or 1% of the net asset value of the Fund,  whichever  is less,  or as
allowed by law.
         The  right of  redemption  may be  suspended  or the date of  payment
postponed  for any period  during which the New York Stock  Exchange is closed
(other than customary weekend and holiday  closings),  when trading on the New
York Stock Exchange is restricted,  or an emergency  exists,  as determined by
the  Securities  and Exchange  Commission,  or if the  Commission  has ordered
such a suspension for the protection of shareholders.

- ------------------------------------------------------------------------------
                                 ADVERTISING
- ------------------------------------------------------------------------------

         The Fund or its affiliates may provide  information  such as, but not
limited  to,  the  economy,   investment   climate,   investment   principles,
sociological  conditions  and  political  ambiance.   Discussion  may  include
hypothetical  scenarios  or  lists of  relevant  factors  designed  to aid the
investor in  determining  whether the Fund is compatible  with the  investor's
goals.  The Fund may list  portfolio  holdings or give  examples or securities
that may have been  considered  for inclusion in the  Portfolio,  whether held
or not.
         The Fund or its affiliates may supply  comparative  performance  data
and rankings from  independent  sources such as Donoghue's  Money Fund Report,
Bank Rate Monitor,  Money,  Forbes,  Lipper  Analytical  Services,  Inc.,  CDA
Investment  Technologies,  Inc.,  Wiesenberger  Investment  Companies Service,
Russell  2000/Small  Stock  Index,  Mutual  Fund Values  Morningstar  Ratings,
Mutual Fund  Forecaster,  Barron's,  The Wall Street  Journal,  and Schabacker
Investment  Management,  Inc.  Such  averages  generally  do not  reflect  any
front-  or  back-end  sales  charges  that  may be  charged  by  Funds in that
grouping.  The Fund may also cite to any source,  whether in print or on-line,
such as Bloomberg,  in order to acknowledge  origin of  information.  The Fund
may compare  itself or its portfolio  holdings to other  investments,  whether
or not issued or  regulated by the  securities  industry,  including,  but not
limited to, certificates of deposit and Treasury notes.
         Calvert   Group  is  the   nation's   leading   family  of   socially
responsible  mutual funds, both in terms of socially  responsible  mutual fund
assets  under  management,  and number of  socially  responsible  mutual  fund
portfolios  offered  (source:  Social  Investment  Forum,  December 31, 1998).
Calvert  Group was also the first to offer a family  of  socially  responsible
mutual fund portfolios.
         The IRR includes  direct  investments  in  companies  only (no funds,
partnerships,  or  financial  institutions).  It is based on annual cash flows
beginning  with the first direct  investment  on December 18, 1992 to the date
shown  in the  advertisement.  Cash  outflows  include  all  disbursements  to
companies,  including  follow-ons.  The IRR assumes  full  exercise of warrant
positions  in the  year  of  calculation  if not  previously  exercised.  Cash
inflows  includes  all  receipts  from  acquisitions  and  earnouts.  It  also
assumes  positions  are fully  liquidated in the year of  calculation.  Public
company holdings are liquidated at market price,  including  warrants;  others
are  liquidated  at carrying  value whether  marked up, down, or at cost.  All
but a small  portion  of  these  returns  are  unrealized.  The IRR on  direct
company  holdings  in the  special  equities  program of the  Fund's  Balanced
Portfolio  was 4.29% from December 18, 1992 through  September 30, 1998.  Past
performance is no guarantee of future results.

- ------------------------------------------------------------------------------
                   TRUSTEES, OFFICERS, AND ADVISORY COUNCIL
- ------------------------------------------------------------------------------

         The Fund's Board of Trustees supervises the Fund's activities and
reviews its contracts with companies that provide it with services. Business
information is provided below about the trustees.
         REBECCA  ADAMSON,  Trustee.  Since  1983,  Ms.  Adamson has served as
President  of  the  national  non-profit,  First  Nations  Financial  Project.
Founded  by  her  in  1980,   First  Nations  is  the  only  American   Indian
alternative  development  institute  in the  country.  She is on the  Board of
Directors  of  the  Calvert  Social  Investment   Foundation.   DOB:  9/10/47.
Address:   First   Nations   Development   Institute,   11917   Main   Street,
Fredericksburg, Virginia 22408.
         RICHARD  L.  BAIRD,  JR.,  Trustee.   Mr.  Baird  is  Executive  Vice
President for the Family Health Council, Inc. in Pittsburgh,  Pennsylvania,  a
non-profit  corporation  that provides  family planning  services,  nutrition,
maternal/child  health care, and various health screening services.  Mr. Baird
is a  trustee/director  of each of the  investment  companies  in the  Calvert
Group of Funds,  except for Calvert Variable Series,  Inc.,  Calvert New World
Fund,  Inc. and Calvert World Values Fund,  Inc.  DOB:  5/9/48.  Address:  211
Overlook Drive, Pittsburgh, Pennsylvania 15216.
         *JOHN  G.  GUFFEY,   JR.,  Trustee.   Executive  Vice  President  and
Trustee.  Mr. Guffey is Executive Vice President of Calvert Social  Investment
Fund.  He is on the  Board  of  Directors  of the  Calvert  Social  Investment
Foundation,  organizing  director of the  Community  Capital Bank in Brooklyn,
New York, and a financial  consultant to various  organizations.  In addition,
he is a director of the Community Bankers Mutual Fund of Denver,  Colorado,  a
director of Ariel Funds,  and the  Treasurer  and  Director of Silby,  Guffey,
and Co.,  Inc., a venture  capital firm. Mr. Guffey is a  trustee/director  of
each of the other investment  companies in the Calvert Group of Funds,  except
for Calvert Variable Series, Inc. and Calvert New World Fund, Inc.
        Mr.  Guffey  has  been  advised  that  the   Securities  and  Exchange
Commission  ("SEC")  has entered an order  against him  relating to his former
service as a director of  Community  Bankers  Mutual Fund,  Inc.  This fund is
not  connected  with  any  Calvert  Fund  or  the  Calvert  Group  and  ceased
operations  in  September,  1994.  Mr.  Guffey  consented  to the entry of the
order  without  admitting  or denying  the  findings  in the order.  The order
contains  findings (1) that the Community  Bankers  Mutual  Fund's  prospectus
and statement of additional  information  were materially false and misleading
because  they  misstated  or failed to state  material  facts  concerning  the
pricing of fund  shares  and the  percentage  of  illiquid  securities  in the
fund's  portfolio  and  that Mr.  Guffey,  as a member  of the  fund's  board,
should  have  known  of  these   misstatements  and  therefore   violated  the
Securities  Act of 1933;  (2) that the price of the fund's  shares sold to the
public  was not  based  on the  current  net  asset  value of the  shares,  in
violation  of the  Investment  Company  Act of 1940 (the  "Investment  Company
Act");  and (3) that the board of the fund,  including  Mr.  Guffey,  violated
the  Investment  Company Act by  directing  the filing of a  materially  false
registration  statement.  The order  directed  Mr.  Guffey to cease and desist
from  committing or causing  future  violations  and to pay a civil penalty of
$5,000.  The SEC placed no restrictions  on Mr.  Guffey's  continuing to serve
as a Trustee  or  Director  of mutual  funds.  DOB:  05/15/48.  Address:  7205
Pomander Lane, Chevy Chase, Maryland 20815.
         JOY V. JONES, Esq., Trustee. Ms. Jones is an attorney and
entertainment manager in New York City. Ms. Jones is also Chairman of the
Board of Ultrafem, Inc. Trustee of Sarah Lawrence College, a member of the
Association of Black Women Attorneys, Inc., and a Trustee of the Community
Service Society of New York. DOB: 7/2/50. Address: 175 West 12th Street, New
York, New York 10011.
         *BARBARA  J.  KRUMSIEK,   Senior  Vice  President  and  Trustee.  Ms.
Krumsiek  serves as President,  Chief  Executive  Officer and Vice Chairman of
Calvert  Group,  Ltd. and as an officer and director of each of its affiliated
companies.  She  is a  director  of  Calvert-Sloan  Advisers,  L.L.C.,  and  a
trustee/director  of each of the investment  companies in the Calvert Group of
Funds,  as well as Senior Vice  President of Calvert Social  Investment  Fund.
Ms.  Krumsiek is on the Board of  Directors of the Calvert  Social  Investment
Foundation.  Prior  to  joining  Calvert  Group,  Ms.  Krumsiek  served  as  a
Managing Director of Alliance Fund Distributors, Inc. DOB: 08/09/52.
         TERRENCE  J.  MOLLNER,   Ed.D.,  Trustee.  Dr.  Mollner  is  Founder,
Chairperson,   and  President  of  Trusteeship  Institute,   Inc.,  a  diverse
foundation known  principally for its consultation to corporations  converting
to  cooperative  employee-ownership.  He is also a director  of Calvert  World
Values  Fund,  Inc.  He  served as a Trustee  of the  Cooperative  Fund of New
England,  Inc.,  and is now a member of its Board of  Advisors.  In  addition,
Dr.  Mollner  is a  founder  and  member  of  the  Board  of  Trustees  of the
Foundation for  Soviet-American  Economic  Cooperation  and is on the Board of
Directors of the Calvert Social Investment Foundation.
         On October 8,  1998,  Mr.  Mollner  declared  and filed for  personal
bankruptcy  protection  under Chapter 7 of the Federal  Bankruptcy  Code.  The
cause  of  Mr.  Mollner's  financial  difficulties  was  losses  sustained  in
trading  in the  options  and  futures  market.  DOB:  12/13/44.  Address:  15
Edwards Square, Northampton, Massachusetts 01060.
         SYDNEY AMARA MORRIS,  Trustee.  Rev. Morris is Senior Minister of the
Unitarian Church of Vancouver,  Canada.  She previously  served as Minister of
the  Unitarian-Universalist  Fellowship  in  Ames,  Iowa.  Rev.  Morris  is  a
graduate of the Harvard Divinity School.  DOB: 9/7/49.  Address:  1225 W. 26th
Avenue, Vancouver, British Columbia, Canada V6H2A8.
         *CHARLES T. NASON, Trustee. Mr. Nason serves as Chairman, President
and Chief Executive Officer of The Acacia Group, a Washington, D.C.-based
financial services organization, including Acacia Mutual Life Insurance
Company and Calvert Group, Ltd. He is a Director of Calvert Administrative
Services Company, Inc., Calvert Asset Management Company, Inc., Calvert
Shareholder Services, Inc., and The Advisor Group, Inc. DOB: 4/22/46.
Address: 7315 Wisconsin Avenue, Bethesda, Maryland 20814.
         *D.  WAYNE  SILBY,  Esq.,  President  and  Trustee.  Mr.  Silby  is a
trustee/director  of each of the investment  companies in the Calvert Group of
Funds,  except for Calvert Variable  Series,  Inc. and Calvert New World Fund,
Inc. He is the  President  of Calvert  Social  Investment  Fund.  Mr. Silby is
Executive  Chairman  of Group  Serve,  Inc.,  an internet  company  focused on
community  building   collaborative  tools,  and  an  officer,   director  and
shareholder  of  Silby,  Guffey &  Company,  Inc.,  which  serves  as  general
partner  of  Calvert  Social  Venture  Partners  ("CSVP").  CSVP is a  venture
capital firm investing in socially  responsible small companies.  He is also a
Director of Acacia Mutual Life  Insurance  Company and Chairman of the Calvert
Social Investment Foundation.  DOB: 7/20/48.  Address: 1715 18th Street, N.W.,
Washington, D.C. 20009.
         RENO J. MARTINI,  Senior Vice  President.  Mr. Martini is Senior Vice
President  of  Calvert  Group,  Ltd.,  and  Senior  Vice  President  and Chief
Investment  Officer of Calvert Asset Management  Company,  Inc. Mr. Martini is
also a  director  and  President  of  Calvert-Sloan  Advisers,  L.L.C.,  and a
director and officer of Calvert New World Fund. DOB: 1/13/50.
         RONALD M.  WOLFSHEIMER,  CPA,  Treasurer.  Mr.  Wolfsheimer is Senior
Vice  President and Chief  Financial  Officer of Calvert  Group,  Ltd. and its
subsidiaries and an officer of each of the other  investment  companies in the
Calvert Group of Funds.  Mr.  Wolfsheimer  is Vice  President and Treasurer of
Calvert-Sloan Advisers,  L.L.C., and a director of Calvert Distributors,  Inc.
DOB: 7/24/52.
         WILLIAM M. TARTIKOFF,  Esq., Vice President and Assistant  Secretary.
Mr.  Tartikoff  is an  officer  of each  of the  investment  companies  in the
Calvert Group of Funds, and is Senior Vice President,  Secretary,  and General
Counsel of Calvert Group,  Ltd., and each of its  subsidiaries.  Mr. Tartikoff
is also Vice  President and Secretary of  Calvert-Sloan  Advisers,  L.L.C.,  a
director of Calvert  Distributors,  Inc., and is an officer of Acacia National
Life Insurance Company. DOB: 8/12/47.
         CATHERINE S. BARDSLEY,  Esq.,  Secretary.  Ms. Bardsley is counsel to
Kirkpatrick  &  Lockhart,   LLP,  the  Fund's  legal  counsel.  DOB:  10/4/49.
Address: 1800 Massachusetts Avenue, N.W., Washington, D.C. 20036.
         DANIEL K. HAYES,  Vice  President.  Mr.  Hayes is Vice  President  of
Calvert  Asset  Management  Company,  Inc.,  and is an  officer of each of the
other investment  companies in the Calvert Group of Funds,  except for Calvert
New World Fund, Inc. DOB: 9/9/50.
         SUSAN  WALKER  BENDER,  Esq.,  Assistant  Secretary.  Ms.  Bender  is
Associate  General  Counsel  of Calvert  Group,  and an officer of each of its
subsidiaries  and  Calvert-Sloan  Advisers,  L.L.C.  She is also an officer of
each of the other  investment  companies in the Calvert  Group of Funds.  DOB:
1/29/59.
         KATHERINE  STONER,   Esq.,   Assistant   Secretary.   Ms.  Stoner  is
Associate  General  Counsel  of  Calvert  Group and an  officer of each of its
subsidiaries  and  Calvert-Sloan  Advisers,  L.L.C.  She is also an officer of
each of the other  investment  companies in the Calvert  Group of Funds.  DOB:
10/21/56.
         IVY WAFFORD DUKE, Esq.,  Assistant  Secretary.  Ms. Duke is Associate
General  Counsel of Calvert  Group and an officer of each of its  subsidiaries
and  Calvert-Sloan  Advisers,  L.L.C.  She is also an  officer  of each of the
other  investment  companies in the Calvert  Group of Funds and  Secretary and
provides  counsel  to the  Calvert  Social  Investment  Foundation.  Prior  to
working  at  Calvert  Group,  Ms.  Duke  was an  Associate  in the  Investment
Management  Group of the Business and Finance  Department at Drinker  Biddle &
Reath. DOB: 09/07/68.

         The address of Trustee  and  Officers,  unless  otherwise  noted,  is
4550 Montgomery Avenue, Suite 1000N,  Bethesda,  Maryland 20814.  Trustees and
officers  of the  Fund  as a  group  own  less  than  1% of  each  Portfolio's
outstanding  shares.  Trustees  marked  with  an  *,  above,  are  "interested
persons" of the Fund, under the Investment Company Act of 1940.
         Mr.  Baird and Ms.  Adamson  serve as the Fund's  representatives  to
the  respective  Audit  Committees  of the other  investment  companies in the
Calvert Group of Funds; and Rev. Morris,  Dr. Mollner,  and Ms. Jones serve as
the Fund's  representatives to the respective  Investment Policy Committees of
the other  investment  companies in the Calvert Group of Funds.  Ms.  Adamson,
Dr.   Mollner,   and  Mr.  Silby  serve  on  the  Fund's  High  Social  Impact
Investments  Committee which assists the Fund in  identifying,  evaluating and
selecting  investments  in  securities  that offer a rate of return  below the
then-prevailing  market rate and that  present  attractive  opportunities  for
furthering the Fund's social criteria.  Ms. Jones,  Rev.  Morris,  and Messrs.
Guffey  and  Silby  serve  on the  Fund's  Special  Equities  Committee  which
assists  the  Fund  in  identifying,  evaluating,  and  selecting  appropriate
special equity investment opportunities for the Fund.
         The  Advisory  Council is a resource to the Fund's  Board of Trustees
regarding  communications  networks  for  the  Fund  and the  application  and
refinement of the Fund's social  criteria.  The Advisory Council has no power,
authority,  or  responsibility  with respect to the  management of the Fund or
the conduct of the affairs of the Fund.  Messrs.  Silby,  Guffey,  Mollner and
Baird, Ms. Adamson,  Ms. Jones,  Rev.  Morris,  and Ms. Krumsiek and Mr. Bynum
of the  Advisory  Council,  serve as directors  of Calvert  Social  Investment
Foundation,  a  non-profit  organization  formed  to  increase  awareness  and
educate  the  general   public  about  the  benefits  of  socially   conscious
investing. The Foundation is not directly affiliated with Calvert Group.
         During  fiscal  1998,  trustees of the Fund not  affiliated  with the
Fund's  Advisor were paid $43,289 by the Money Market  Portfolio,  $179,492 by
the Balanced Portfolio,  $15,807 by the Bond Portfolio,  $45,492 by the Equity
Portfolio,  and $943 by the Managed Index Portfolio.  Trustees of the Fund not
affiliated  with the  Advisor  presently  receive an annual fee of $20,500 for
service as a member of the Board of Trustees  of the  Calvert  Group of Funds,
and a fee of $750 to  $1500  for  each  regular  Board  or  Committee  meeting
attended;  such fees are allocated among the respective  Portfolios based upon
their  relative net assets.  Trustees who serve only the CSIF Board receive an
annual  fee of  $15,430,  plus  $600  for each  Board  and  Committee  meeting
attended.
         Trustees  of the Fund not  affiliated  with the  Fund's  Advisor  may
elect to defer  receipt of all or a  percentage  of their fees and invest them
in any fund in the  Calvert  Family of Funds  through  the  Trustees  Deferred
Compensation  Plan (shown as "Pension or Retirement  Benefits  Accrued as part
of Fund  Expenses,"  below).  Deferral of the fees is designed to maintain the
parties  in the same  position  as if the fees were  paid on a current  basis.
Management  believes this will have a negligible  effect on the Fund's assets,
liabilities, net assets, and net income per share.

                          Trustee Compensation Table

Fiscal Year 1998      Aggregate         Pension or        Total Compensation
                      Compensation      Retirement        from Benefits
(unaudited numbers)   from Registrant   Accrued as        Registrant and Fund
                      for Service       part of           Complex paid to
                      as Trustee        of Registrant     Trustee**
                                        Expenses*

Name of Trustee

Rebecca Adamson       $22,878          $5,317             $24,831
Richard L. Baird, Jr. $1,845           $0                 $35,800
John G. Guffey, Jr.   $11,252          $0                 $54,715
Joy V. Jones          $30,081          $0                 $30,081
Terrence J. Mollner   $34,020          $0                 $44,731
Sydney Amara Morris   $23,631          $12,000            $23,631
D. Wayne Silby        $20,375          $0                 $60,831

*Ms.  Adamson  and  Rev.  Morris  have  chosen  to  defer a  portion  of their
compensation.   As  of  September  30,  1998,  total  deferred   compensation,
including   dividends   and  capital   appreciation,   was   $48,868.45,   and
$11,410.96, for each trustee, respectively.
**As of September 30, 1998.  The Fund Complex  consists of nine (9) registered
investment companies.

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                              INVESTMENT ADVISOR
- ------------------------------------------------------------------------------

         The Fund's  Investment  Advisor is Calvert Asset Management  Company,
Inc., 4550 Montgomery Avenue,  1000N,  Bethesda,  Maryland 20814, a subsidiary
of Calvert Group Ltd.,  which is a subsidiary of Acacia Mutual Life  Insurance
Company of Washington,  D.C.  ("Acacia  Mutual").  Effective  January 1, 1999,
Acacia merged with and became a subsidiary of Ameritas  Acacia Mutual  Holding
Company.  Under the Advisory Contract,  the Advisor provides investment advice
to the Fund and oversees its day-to-day  operations,  subject to direction and
control by the Fund's Board of Trustees.  The Advisor  provides the Funds with
investment  supervision and management,  and office space; furnishes executive
and  other  personnel  to the  Funds;  and pays the  salaries  and fees of all
Trustees/Directors  who are  employees of the Advisor or its  affiliates.  The
Fund  pays  all  other  administrative  and  operating  expenses,   including:
custodial,   registrar,   dividend   disbursing  and  transfer   agency  fees;
administrative  service fees; federal and state securities  registration fees;
salaries,  fees and expenses of trustees,  executive officers and employees of
the Fund, and Advisory Council  members,  who are not employees of the Advisor
or of its affiliates;  insurance  premiums;  trade association dues; legal and
audit fees;  interest,  taxes and other  business  fees;  expenses of printing
and  mailing   reports,   notices,   prospectuses,   and  proxy   material  to
shareholders;   annual   shareholders'   meeting   expenses;   and   brokerage
commissions  and  other  costs  associated  with  the  purchase  and  sale  of
portfolio securities.
         Under a new  advisory  agreement  approved by  shareholders  in early
1999, the Advisor receives an annual fee,  payable  monthly,  of 0.425% of the
first $500  million of the  Balanced  Portfolio's  average  daily net  assets,
0.40% of the next $500  million  of such  assets,  and  0.375%  of all  assets
above $1  billion;  0.35% of the Bond  Portfolio's  average  daily net assets;
0.50% of the Equity Portfolio's  average daily net assets;  0.30% of the Money
Market  Portfolio's  average  daily net assets and 0.60% of the Managed  Index
Portfolio's average daily net assets.
         The  Advisor  reserves  the  right to (i)  waive all or a part of its
fee; (ii)  reimburse the Fund for expenses;  and (iii) pay  broker-dealers  in
consideration of their promotional or administrative services.
         The Advisor  may,  but is not  required to waive  current  payment of
its fees,  or to  reimburse  expenses  of the Fund.  The Advisor has agreed to
reimburse  the  Money  Market,   Balanced,   and  Bond  Portfolios  for  their
respective   operating  expenses  (excluding   brokerage,   taxes,   interest,
Distribution Plan expenses and  extraordinary  items, and, with respect to the
Balanced Portfolio,  performance fees earned) exceeding,  on a pro rata basis,
1.5% of the first $30  million of the  respective  Portfolio's  average  daily
net assets, and 1% of such assets in excess of $30 million.
         Any fees the  current  payment of which is waived by the  Advisor and
any expenses paid on behalf of or  reimbursed  to the Managed Index  Portfolio
by the Advisor  through  February 29, 2000,  may be  recaptured by the Advisor
from the Portfolio  during the two years  beginning  March 1, 2000, and ending
February 28,  2002.  Such  recapture  shall only be made to the extent that it
does not result in the  Portfolio's  Class A aggregate  expenses  exceeding on
an annual basis 2.00% of Class A average daily net assets,  and 3.25%,  3.25%,
and 1.25%,  respectively,  for Class B, Class C and Class I. The  Advisor  may
voluntarily  make  additional  fee  waivers  or  expense  reimbursements  with
respect  to the  Portfolio  from  March 1, 2000  through  February  28,  2002,
("Additional  Period");  provided,  however,  that (a) any  fees  the  current
payment of which is waived by the Advisor and any  expenses  paid on behalf of
or  reimbursed to the Portfolio by the Advisor  during the  Additional  Period
may be  recaptured  by the  Advisor  from the  Portfolio  during the two years
beginning  on  March  1,  2002  and  ending  February  29,  2004  and (b) such
recapture  shall  only be made to the  extent  that it does not  result in the
Portfolio's Class A aggregate  expenses  exceeding on an annual basis 2.00% of
Class A average daily net assets,  and 3.25%,  3.25% and 1.25%,  respectively,
for Class B, Class C and Class I.

Subadvisors

         Brown Capital  Management,  Inc. is controlled by Eddie C. Brown.  It
receives a subadvisory fee, paid by the Advisor, of 0.25% of net assets.

         NCM  Capital  Management  Group,  Inc. is a  subsidiary  of the North
Carolina Mutual Life Insurance  Company.  It receives a subadvisory  fee, paid
by the Advisor, of 0.25% of net assets.

         Atlanta  Capital  Management  Company  is owned and  operated  by six
partners.  For its services to CSIF  Equity,  it receives a  subadvisory  fee,
paid by the Advisor, of 0.30% of the assets it manages for CSIF Equity.

         State Street  Global  Advisors is a division of State Street Bank and
Trust.  It  receives a  subadvisor  fee paid by the  Advisor,  of 0.35% of the
Portfolio's  first $100  million  of average  net assets and 0.25% of any such
assets over $100 million, subject to a minimum annual fee of $150,000.

         The Fund has received an  exemptive  order to permit the Fund and the
Advisor  to  enter  into  and  materially  amend  the  Investment  Subadvisory
Agreement without shareholder  approval.  The order is currently applicable to
the Equity and Managed Index Portfolio.  Authorization  for the Advisor to act
on the  order  with  respect  to the other  Portfolios  is  currently  pending
shareholder  approval.  If approved,  then within 90 days of the hiring of any
Subadvisor  or the  implementation  of any  proposed  material  change  in the
Investment   Subadvisory   Agreement,   the   Portfolio   will   furnish   its
shareholders  information  about the new Subadvisor or Investment  Subadvisory
Agreement that would be included in a proxy  statement.  Such information will
include  any  change  in  such  disclosure  caused  by the  addition  of a new
Subadvisor  or any  proposed  material  change in the  Investment  Subadvisory
Agreement  of the  Portfolio.  The  Portfolio  will  meet  this  condition  by
providing  shareholders,  within 90 days of the  hiring of the  Subadvisor  or
implementation   of  any  material  change  to  the  terms  of  an  Investment
Subadvisory Agreement, with an information statement to this effect.
         The advisory  fees paid to the Advisor by the Money Market  Portfolio
for the fiscal years ended  September 30, 1996,  1997, and 1998 were $809,573,
$829,686,  and $846,146,  respectively.  The advisory fees paid to the Advisor
by the  Balanced  Portfolio  for the same years were  $4,054,218,  $3,739,407,
and  $4,374,411,  respectively.  The  advisory  fees paid to the  Advisor  for
these years by the Bond Portfolio were $421,016,  $363,612,  and $345,357;  by
the Equity  Portfolio  $496,208,  $683,046,  and $889,599;  and by the Managed
Index Portfolio $54,079 (date of inception April 15, 1998).
         Calvert  Administrative  Services Company  ("CASC"),  an affiliate of
the Advisor,  has been retained by the Fund to provide certain  administrative
services  necessary to the conduct of its affairs,  including the  preparation
of regulatory  filings and shareholder  reports.  For providing such services,
CASC  receives an annual  administrative  service  fee  payable  monthly (as a
percentage of net assets) as follows:

                           Class A, B, and C       Class I
     Balanced              0.275%                  0.125%
     Bond                  0.30%                   0.10%
     Equity                0.20%                   0.10%
     Managed Index         0.15%                   0.10%
     Money Market          0.20%                   N/A

         From  its  inception  through  September  30,  1998,   Managed  Index
Portfolio paid $9,840 to CASC in  administrative  fees.  The other  Portfolios
will  begin to pay CASC an  administrative  service  fee in  1999.  For  those
Portfolios with multiple  classes,  investment  advisory fees are allocated as
a  Portfolio-level  expense based on net assets.  Administrative  service fees
are allocated as a class-level expense, again based on net assets.

- ------------------------------------------------------------------------------
                            METHOD OF DISTRIBUTION
- ------------------------------------------------------------------------------

         Calvert Distributors, Inc. ("CDI") is the principal underwriter and
distributor for the Fund. Under the terms of its underwriting agreement with
the Funds, CDI markets and distributes the Fund's shares and is responsible
for preparing advertising and sales literature, and printing and mailing
prospectuses to prospective investors.
         Pursuant  to Rule 12b-1  under the  Investment  Company  Act of 1940,
the Fund has adopted  Distribution  Plans (the "Plans")  which permit the Fund
to pay certain  expenses  associated  with the  distribution  and servicing of
its shares.  Such  expenses  for Class A shares may not  exceed,  on an annual
basis, 0.35% of the Balanced,  Equity and Bond Portfolios'  respective average
daily net assets and 0.25% of the Money Market and Managed  Index  Portfolios'
average  daily  net  assets.   However,  the  Fund's  Board  of  Trustees  has
determined  that,  until further action by the Board,  no Portfolio  shall pay
Class A  distribution  expenses  in excess of 0.25% of its  average  daily net
assets;  and further,  that Class A  distribution  expenses only be charged on
the  average  daily  net  assets  of  the  Balanced  Portfolio  in  excess  of
$30,000,000.
         Expenses  under the Fund's  Class B and Class C Plans may not exceed,
on an annual  basis,  1.00% of the  Balanced,  Bond,  Equity and Managed Index
Portfolios'  Class B and  Class C  average  daily  net  assets,  respectively.
Class A Distribution  Plans  reimburse CDI only for expenses it incurs,  while
the Class B and C Distribution  Plans  compensate CDI at a set rate regardless
of CDI's expenses.
         The  Fund's   Distribution  Plans  were  approved  by  the  Board  of
Trustees,  including  the  Trustees  who are not  "interested  persons" of the
Fund (as that term is defined in the  Investment  Company Act of 1940) and who
have no direct or indirect  financial  interest in the  operation of the Plans
or in any  agreements  related to the Plans.  The selection and  nomination of
the  Trustees who are not  interested  persons of the Fund is committed to the
discretion of such  disinterested  Trustees.  In establishing  the Plans,  the
Trustees  considered  various factors including the amount of the distribution
expenses.  The Trustees determined that there is a reasonable  likelihood that
the Plans will benefit the Fund and its shareholders.
         The  Plans  may  be   terminated   by  vote  of  a  majority  of  the
non-interested  Trustees who have no direct or indirect  financial interest in
the  Plans,  or by  vote  of a  majority  of  the  outstanding  shares  of the
affected  class or Portfolio of the Fund.  If the Fund should ever switch to a
new  principal  underwriter  without  terminating  the  Class B Plan,  the fee
would be prorated  between CDI and the new principal  underwriter.  Any change
in the  Plans  that  would  materially  increase  the  distribution  cost to a
Portfolio  requires  approval  of  the  shareholders  of the  affected  class;
otherwise,  the Plans may be amended by the Trustees,  including a majority of
the  non-interested  Trustees as described  above.  The Plans will continue in
effect  for  successive  one-year  terms  provided  that such  continuance  is
specifically  approved by (i) the vote of a majority of the  Trustees  who are
not  parties  to the Plans or  interested  persons  of any such  party and who
have no direct or  indirect  financial  interest  in the  Plans,  and (ii) the
vote of a majority of the entire Board of Trustees.
         Apart from the Plans, the Advisor and CDI, at their own expense,
may incur costs and pay expenses associated with the distribution of shares
of the Fund.
         CDI,  makes a  continuous  offering  of the  Fund's  securities  on a
"best efforts"  basis.  Under the terms of the  agreement,  CDI is entitled to
receive,  pursuant  to  the  Distribution  Plans,  a  distribution  fee  and a
service  fee from the Fund  based on the  average  daily  net  assets  of each
Portfolio's  respective  Classes.  These fees are paid  pursuant to the Fund's
Distribution   Plan.   The   Distribution   Plan   Expenses   (includes   both
distribution  fees and services  fees) paid by each fund (all  classes) to CDI
for the fiscal year ended September 30, 1998, is as follows:

                                    Distribution Plan Expenses
         Money Market               $0
         Balanced                   $1,765,329
         Bond                       $127,076
         Equity                     $425,952
         Managed Index              $6,150

         Of  the  distribution   expenses  paid  by  Class  A  Shares  of  the
Balanced,  Bond,  Equity,  and Managed  Index  Portfolios in fiscal year 1998,
$966,729,  $123,575,   $324,734,  and  $2,476,   respectively,   was  used  to
compensate  dealers  for  their  share  distribution   promotional   services.
$686,974,  $1,549,  $25,536, and $984 was used for the printing and mailing of
prospectuses   and  sales   materials   to   investors   (other  than  current
shareholders), and the remainder partially financed advertising.

CSIF Balanced, Equity, and Managed Index Portfolios
Class A shares are offered at net asset value plus a front-end sales charge
as follows:


                                    As a % of    As a % of    Allowed to
Amount of                           offering     net amount   Brokers as a %
Investment                          price        invested     of offering
                                                              price
Less than $50,000                   4.75%        4.99%        4.00%
$50,000 but less than $100,000      3.75%        3.90%        3.00%
$100,000 but less than $250,000     2.75%        2.83%        2.25%
$250,000 but less than $500,000     1.75%        1.78%        1.25%
$500,000 but less than $1,000,000   1.00%        1.01%        0.80%
$1,000,000 and over                 0.00%        0.00%        0.00%

CSIF Bond Portfolio
Class A Shares are offered at net asset value plus a front-end sales charge
as follows:

                                    As a % of    As a % of    Allowed to
Amount of                           offering     net amount   Brokers as a %
Investment                          price        invested     of offering
                                                              price
Less than $50,000                   3.75%        3.90%        3.00%
$50,000 but less than $100,000      3.00%        3.09%        2.25%
$100,000 but less than $250,000     2.25%        2.30%        1.75%
$250,000 but less than $500,000     1.75%        1.78%        1.25%
$500,000 but less than $1,000,000   1.00%        1.01%        0.80%
$1,000,000 and over                 0.00%        0.00%        0.00%

         CDI  receives any  front-end  sales charge or CDSC paid. A portion of
the front-end sales charge may be reallowed to dealers.  The aggregate  amount
of sales charges (gross  underwriting  commissions)  and for Class A only, the
net amount  retained by CDI (i.e.,  not  reallowed  to dealers) for the last 3
fiscal years are:

Fiscal Years        1996
Class A             Gross/Net
Balanced            $1,177,181      $405,789
Bond                $161,888        $56,699
Equity              $365,789        $129,525
Managed Index       $0              $0

Fiscal Years        1997
Class A             Gross/Net
Balanced            $934,782        $331,679
Bond                $136,085        $53,362
Equity              $557,333        $211,952
Managed Index       $0                    $0

Fiscal Years        1998
Class A             Gross/Net
Balanced            $969,119        $356,525
Bond                $138,075        $54,024
Equity              $585,617        $216,176
Managed Index       $32,049         $4,026

Fiscal Year                1996             1997              1998
Class B
Balanced                   NA               NA                $309
Bond                       NA               NA                $0
Equity                     NA               NA                $1,517
Managed Index              NA               NA                $164

Fiscal Year                1996             1997              1998
Class C
Balanced                   NA               NA                $36
Bond                       NA               NA                $0
Equity                     NA               NA                $13
Managed Index              NA               NA                $0

         Fund  Trustees and certain other  affiliated  persons of the Fund are
exempt  from the sales  charge  since the  distribution  costs are  minimal to
persons already familiar with the Fund.  Other groups (e.g.,  group retirement
plans) are exempt due to  economies  of scale in  distribution.  See Exhibit A
to the Prospectus.

- ------------------------------------------------------------------------------
                  TRANSFER AND SHAREHOLDER SERVICING AGENTS
- ------------------------------------------------------------------------------

         National  Financial Data  Services,  Inc.  ("NFDS"),  a subsidiary of
State  Street Bank & Trust,  has been  retained by the Fund to act as transfer
agent  and  dividend   disbursing  agent.  These   responsibilities   include:
responding to certain  shareholder  inquiries and instructions,  crediting and
debiting  shareholder  accounts for purchases and  redemptions  of Fund shares
and confirming such transactions,  and daily updating of shareholder  accounts
to reflect declaration and payment of dividends.
         Calvert  Shareholder  Services,  Inc., a subsidiary of Calvert Group,
Ltd., and Acacia  Mutual,  has been retained by the Fund to act as shareholder
servicing agent.  Shareholder  servicing  responsibilities  include responding
to  shareholder   inquiries  and   instructions   concerning  their  accounts,
entering  any  telephoned  purchases  or  redemptions  into the  NFDS  system,
maintenance of broker-dealer  data, and preparing and distributing  statements
to shareholders regarding their accounts.  Calvert Shareholder Services,  Inc.
was the sole transfer agent prior to January 1, 1998.
         For these  services,  NFDS and  Calvert  Shareholder  Services,  Inc.
receive a fee based on the number of shareholder accounts and transactions.

- ------------------------------------------------------------------------------
                            PORTFOLIO TRANSACTIONS
- ------------------------------------------------------------------------------

         Portfolio   transactions   are  undertaken  on  the  basis  of  their
desirability   from  an  investment   standpoint.   The  Fund's   Advisor  and
Subadvisors  make  investment  decisions and the choice of brokers and dealers
under the direction and supervision of the Fund's Board of Trustees.
         Broker-dealers  who execute  portfolio  transactions on behalf of the
Fund are  selected  on the basis of their  execution  capability  and  trading
expertise  considering,  among other factors,  the overall  reasonableness  of
the brokerage commissions,  current market conditions,  size and timing of the
order, difficulty of execution, per share price, etc.
         For the last three fiscal years,  total  brokerage  commissions  paid
are as follows:
                             1996           1997          1998
         Balanced            $693,085       $547,048      $542,108
         Equity              $352,527       $329,488      $487,723
         Bond                $0             $0            $0
         Managed Index       $0             $0            $9,405
         The  Fund  did  not  pay  any  brokerage  commissions  to  affiliated
         persons during the last three fiscal years.
         While the Fund's Advisor and  Subadvisor(s)  select brokers primarily
on the basis of best  execution,  in some cases  they may direct  transactions
to  brokers   based  on  the   quality   and  amount  of  the   research   and
research-related  services which the brokers  provide to them.  These services
are of the type described in Section 28(e) of the  Securities  Exchange Act of
1934 and may include  analyses  of the  business  or  prospects  of a company,
industry or economic sector, or statistical and pricing  services.  Other such
services  are  designed  primarily  to assist the  Advisor in  monitoring  the
investment  activities  of  the  Subadvisor(s)  of  the  Fund.  Such  services
include  portfolio  attribution  systems,  return-based  style  analysis,  and
trade-execution analysis.
         If, in the  judgment  of the  Advisor or  Subadvisor(s),  the Fund or
other  accounts  managed by them will be  benefited by  supplemental  research
services,  they  are  authorized  to pay  brokerage  commissions  to a  broker
furnishing  such  services  which are in excess of  commissions  which another
broker may have charged for effecting  the same  transaction.  These  research
services   include  advice,   either  directly  or  through   publications  or
writings,  as to the value of securities,  the  advisability  of investing in,
purchasing  or selling  securities,  and the  availability  of  securities  or
purchasers  or sellers of  securities;  furnishing  of  analyses  and  reports
concerning  issuers,  securities  or  industries;   providing  information  on
economic  factors and trends;  assisting in  determining  portfolio  strategy;
providing  computer software used in security  analyses;  providing  portfolio
performance  evaluation and technical  market  analyses;  and providing  other
services  relevant  to  the  investment  decision  making  process.  It is the
policy  of the  Advisor  that  such  research  services  will be used  for the
benefit  of the  Fund  as  well as  other  Calvert  Group  funds  and  managed
accounts.

         For the fiscal year ended  September 30, 1998, the Fund,  through its
Advisor and/or  Subadvisors,  directed  brokerage for research services in the
following amounts:
                                                            Related
         Portfolio             Amount of Transactions       Commissions

         Balanced              $484,312,613                 $542,108
         Equity                $313,651,712                 $487,723
         Bond                  $0                           $0
         Managed Index         $0                           $0

         The  Portfolio  turnover  rates for the last two fiscal  years are as
follows:
                               1997              1998
         Balanced              215%              185%
         Equity                93%               110%
         Bond                  319%              620%
         Managed Index         N/A               N/A

         The  turnover  of the Bond  Portfolio  increased  significantly  from
fiscal year 1997 to 1998. This increase was due to the  implementation  of the
Advisor's more active trading strategy.

- ------------------------------------------------------------------------------
                    INDEPENDENT ACCOUNTANTS AND CUSTODIANS
- ------------------------------------------------------------------------------

         PricewaterhouseCoopers   LLP  has  been  selected  by  the  Board  of
Trustees  to serve as  independent  accountants  for fiscal  year 1999.  State
Street Bank & Trust Company,  N.A.,  225 Franklin  Street,  Boston,  MA 02110,
serves  as  custodian  of the  Fund's  investments.  First  National  Bank  of
Maryland,  25 South Charles Street,  Baltimore,  Maryland 21203 also serves as
custodian of certain of the Fund's cash assets.  The  custodians  have no part
in deciding the Fund's  investment  policies or the choice of securities  that
are to be purchased or sold for the Fund's Portfolios.

- ------------------------------------------------------------------------------
             CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES
- ------------------------------------------------------------------------------

         As of January 19, 1999,  the following  shareholders  owned of record
5% or more of the class of the Fund shown:

         Name and Address                      % of Ownership

Money Market Portfolio
         United Mine Workers of America        5.46%
         Washington, D.C.

         Fleet National Bank                   5.13%
         Rochester, New York

Bond Portfolio
         Prudential Securities                 5.11%, Class B
         FBO F. Caplan Trust
         Amherst, Massachusetts

         Prudential Securities                 6.01%, Class B
         FBO P. Lichterman
         Madison, Wisconsin

         Beverly Williams Trust                7.62%, Class C
         Chesterfield, Missouri

         NFSC FEBO W. Wilkie                   8.04%, Class C
         Honolulu, Hawaii

Managed Index Portfolio
         Robert Thompson                       6.63%, Class B
         Seattle, Washington

         General Teamsters Local #174          24.22%, Class C
         Seattle, Washington

         Resources Trust IRA                   11.86%, Class C
         FBO M. Akiyama-Worley
         Denver, Colorado

         Acacia Retirement Plan                100%, Class I
         Bethesda, Maryland

- ------------------------------------------------------------------------------
                             GENERAL INFORMATION
- ------------------------------------------------------------------------------

         CSIF  is  an  open-end  diversified  management  investment  company,
organized as a  Massachusetts  business  trust on December 14, 1981.  Prior to
December  1,  1998,  the  Balanced  Portfolio  was  named the  Managed  Growth
Portfolio.  The Fund's  Declaration of Trust contains an express disclaimer of
shareholder  liability for acts or obligations  of the Fund. The  shareholders
of  a   Massachusetts   business   trust   might,   however,   under   certain
circumstances,  be held  personally  liable as partners  for its  obligations.
The Declaration of Trust provides for  indemnification  and  reimbursement  of
expenses out of Fund assets for any  shareholder  held  personally  liable for
obligations  of the Fund.  The  Declaration  of Trust also  provides  that the
Fund shall,  upon  request,  assume the defense of any claim made  against any
shareholder  for any act or  obligation  of the Fund and satisfy any  judgment
thereon.  The  Declaration  of  Trust  further  provides  that  the  Fund  may
maintain appropriate  insurance (for example,  fidelity bonding and errors and
omissions  insurance)  for  the  protection  of the  Fund,  its  shareholders,
trustees,  officers,  employees  and agents to cover  possible  tort and other
liabilities.  Thus,  the risk of a  shareholder  incurring  financial  loss on
account of  shareholder  liability is limited to  circumstances  in which both
inadequate  insurance  exists  and the  Fund  itself  is  unable  to meet  its
obligations.
         Each  share  of  each  series   represents  an  equal   proportionate
interest  in that  series  with  each  other  share  and is  entitled  to such
dividends  and  distributions  out of the income  belonging  to such series as
declared by the Board.  The Balanced,  Equity,  and Managed  Index  Portfolios
each offer  four  separate  classes  of shares:  Class A, Class B, Class C and
Class I. The Bond  Portfolio  offers  Class A, Class B and Class C. Each class
represents  interests  in the same  portfolio of  investments  but, as further
described  in the  prospectus,  each  class  is  subject  to  differing  sales
charges and  expenses,  which  differences  will result in differing net asset
values and  distributions.  Upon any liquidation of the Fund,  shareholders of
each  class are  entitled  to share pro rata in the net  assets  belonging  to
that series available for distribution.
         The Fund is not  required to hold annual  shareholder  meetings,  but
special  meetings  may  be  called  for  certain  purposes  such  as  electing
Trustees,  changing fundamental  policies, or approving a management contract.
As a  shareholder,  you receive  one vote for each share you own,  except that
matters affecting  classes  differently,  such as Distribution  Plans, will be
voted on separately by the affected class(es).

- ------------------------------------------------------------------------------
                                   APPENDIX
- ------------------------------------------------------------------------------

CORPORATE BOND AND COMMERCIAL PAPER RATINGS
Corporate Bonds:
Description  of  Moody's  Investors  Service  Inc.'s/Standard  &  Poor's  bond
ratings:
         Aaa/AAA:  Best  quality.  These  bonds carry the  smallest  degree of
investment  risk  and are  generally  referred  to as  "gilt  edge."  Interest
payments are  protected by a large or by an  exceptionally  stable  margin and
principal is secure.  This rating  indicates an extremely  strong  capacity to
pay principal and interest.
         Aa/AA:   Bonds   rated  AA  also   qualify   as   high-quality   debt
obligations.  Capacity to pay  principal  and interest is very strong,  and in
the  majority of instances  they differ from AAA issues only in small  degree.
They are rated lower than the best bonds  because  margins of  protection  may
not be as large as in Aaa securities,  fluctuation of protective  elements may
be of greater  amplitude,  or there may be other  elements  present which make
long-term risks appear somewhat larger than in Aaa securities.
         A/A:  Upper-medium  grade  obligations.  Factors  giving  security to
principal and interest are  considered  adequate,  but elements may be present
which  make the bond  somewhat  more  susceptible  to the  adverse  effects of
circumstances and economic conditions.
         Baa/BBB:   Medium  grade   obligations;   adequate  capacity  to  pay
principal and  interest.  Whereas they normally  exhibit  adequate  protection
parameters,  adverse economic  conditions or changing  circumstances  are more
likely to lead to a  weakened  capacity  to pay  principal  and  interest  for
bonds in this category than for bonds in higher rated categories.
         Ba/BB,  B/B,  Caa/CCC,  Ca/CC:  Debt  rated  in these  categories  is
regarded  as  predominantly  speculative  with  respect  to  capacity  to  pay
interest  and repay  principal.  The  higher the  degree of  speculation,  the
lower  the  rating.  While  such  debt  will  likely  have  some  quality  and
protective  characteristics,  these are outweighed by large  uncertainties  or
major risk exposure to adverse conditions.
         C/C:  This  rating is only for income  bonds on which no  interest is
being paid.
         D: Debt in  default;  payment  of  interest  and/or  principal  is in
arrears.

Commercial Paper Ratings:
         MOODY'S INVESTORS SERVICE, INC.:
         The Prime rating is the highest  commercial  paper rating assigned by
Moody's.  Among the factors  considered  by Moody's in  assigning  ratings are
the following:  (1)  evaluation of the management of the issuer;  (2) economic
evaluation  of  the  issuer's  industry  or  industries  and an  appraisal  of
speculative-type   risks  which  may  be  inherent  in  certain   areas;   (3)
evaluation of the issuer's  products in relation to  competition  and customer
acceptance;  (4)  liquidity;  (5) amount and quality of  long-term  debt;  (6)
trend of  earnings  over a period of ten years;  (7)  financial  strength of a
parent  company and the  relationships  which  exist with the issuer;  and (8)
recognition  by  management of  obligations  which may be present or may arise
as a result  of  public  interest  questions  and  preparations  to meet  such
obligations.  Issuers  within this Prime  category may be given  ratings 1, 2,
or 3, depending on the relative strengths of these factors.
         STANDARD & POOR'S CORPORATION:
         Commercial  paper  rated A by  Standard  & Poor's  has the  following
characteristics:   (i)   liquidity   ratios   are   adequate   to  meet   cash
requirements;  (ii)  long-term  senior  debt  rating  should  be A or  better,
although in some cases BBB credits  may be allowed if other  factors  outweigh
the BBB;  (iii) the  issuer  should  have  access  to at least two  additional
channels  of  borrowing;  (iv) basic  earnings  and cash flow  should  have an
upward  trend  with  allowances  made  for  unusual  circumstances;   and  (v)
typically  the issuer's  industry  should be well  established  and the issuer
should have a strong  position  within its  industry and the  reliability  and
quality of  management  should be  unquestioned.  Issuers  rated A are further
referred  to by use of  numbers  1, 2 and 3 to denote  the  relative  strength
within this highest classification.

                               LETTER OF INTENT

                           
Date

Calvert Distributors, Inc.
4550 Montgomery Avenue
Bethesda, MD 20814

Ladies and Gentlemen:

         By  signing  this  Letter of Intent,  or  affirmatively  marking  the
Letter of Intent  option on my Fund  Account  Application  Form, I agree to be
bound by the terms and  conditions  applicable to Letters of Intent  appearing
in the  Prospectus  and the Statement of Additional  Information  for the Fund
and the  provisions  described  below as they may be amended from time to time
by the Fund. Such amendments will apply  automatically  to existing Letters of
Intent.

         I intend to invest in the shares of:_____________________ (Fund or
Portfolio name) during the thirteen (13) month period from the date of
my first purchase pursuant to this Letter (which cannot be more than ninety
(90) days prior to the date of this Letter or my Fund Account Application
Form, whichever is applicable), an aggregate amount (excluding any
reinvestments of distributions) of at least fifty thousand dollars ($50,000)
which, together with my current holdings of the Fund (at public offering
price on date of this Letter or my Fund Account Application Form, whichever
is applicable), will equal or exceed the amount checked below:

         __ $50,000 __ $100,000 __ $250,000 __ $500,000 __ $1,000,000

         Subject to the  conditions  specified  below,  including the terms of
escrow,  to which I hereby agree,  each purchase  occurring  after the date of
this Letter will be made at the public  offering price  applicable to a single
transaction of the dollar amount  specified  above, as described in the Fund's
prospectus.  "Fund"  in this  Letter  of  Intent  shall  refer  to the Fund or
Portfolio,  as the case may be. No  portion  of the sales  charge  imposed  on
purchases made prior to the date of this Letter will be refunded.

         I am making no  commitment  to purchase  shares,  but if my purchases
within  thirteen  months from the date of my first  purchase do not  aggregate
the minimum amount  specified  above, I will pay the increased amount of sales
charges  prescribed in the terms of escrow  described below. I understand that
4.75% of the minimum dollar amount  specified  above will be held in escrow in
the form of shares  (computed to the nearest  full  share).  These shares will
be held subject to the terms of escrow described below.

         From the initial  purchase (or  subsequent  purchases if  necessary),
4.75% of the dollar  amount  specified  in this Letter shall be held in escrow
in  shares of the Fund by the  Fund's  transfer  agent.  For  example,  if the
minimum  amount  specified  under the Letter is $50,000,  the escrow  shall be
shares valued in the amount of $2,375  (computed at the public  offering price
adjusted  for a  $50,000  purchase).  All  dividends  and  any  capital  gains
distribution on the escrowed shares will be credited to my account.

         If the  total  minimum  investment  specified  under  the  Letter  is
completed  within a thirteen  month period,  escrowed  shares will be promptly
released  to me.  However,  shares  disposed  of  prior to  completion  of the
purchase  requirement  under  the  Letter  will be  deducted  from the  amount
required to complete the investment commitment.

         Upon expiration of this Letter,  the total purchases  pursuant to the
Letter  are less than the  amount  specified  in the  Letter  as the  intended
aggregate purchases,  Calvert  Distributors,  Inc. ("CDI") will bill me for an
amount  equal to the  difference  between the lower load I paid and the dollar
amount  of  sales  charges  which  I  would  have  paid  if the  total  amount
purchased had been made at a single time.  If not paid by the investor  within
20 days, CDI will debit the difference from my account.  Full shares,  if any,
remaining  in escrow  after the  aforementioned  adjustment  will be  released
and, upon request, remitted to me.

         I  irrevocably  constitute  and appoint  CDI as my  attorney-in-fact,
with full  power of  substitution,  to  surrender  for  redemption  any or all
escrowed  shares on the books of the Fund.  This power of  attorney is coupled
with an interest.

         The  commission  allowed  by CDI to the  broker-dealer  named  herein
shall  be at  the  rate  applicable  to the  minimum  amount  of my  specified
intended purchases.

         The  Letter  may be  revised  upward  by me at any  time  during  the
thirteen-month  period,  and such a revision  will be treated as a new Letter,
except that the  thirteen-month  period during which the purchase must be made
will  remain  unchanged  and there  will be no  retroactive  reduction  of the
sales charges paid on prior purchases.

         In determining the total amount of purchases made  hereunder,  shares
disposed  of  prior  to  termination  of  this  Letter  will be  deducted.  My
broker-dealer  shall  refer to this  Letter of Intent in  placing  any  future
purchase orders for me while this Letter is in effect.


                                    
Dealer

                                    
Name of Investor(s)

                                    
Authorized Signer

                                    
Address


                                    
Date

                                    
Signature of Investor(s)

                                    
Date

                                    
Signature of Investor(s)


INVESTMENT ADVISOR
Calvert Asset Management Company, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

SHAREHOLDER SERVICE
Calvert Shareholder Services, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

PRINCIPAL UNDERWRITER
Calvert Distributors, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

TRANSFER AGENT
National Financial Data Services, Inc.
1004 Baltimore
6th Floor
Kansas City, Missouri 64105

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers
250 West Pratt Street
Baltimore, Maryland 21201





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