DEAN WITTER U S GOVERNMENT MONEY MARKET TRUST
485BPOS, 1998-03-02
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 2, 1998
 
                                                     REGISTRATION NOS.:  2-74980
                                                                        811-3326
 
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- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                ----------------
 
                                   FORM N-1A
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933                     /X/
                          PRE-EFFECTIVE AMENDMENT NO.                        / /
                       POST-EFFECTIVE AMENDMENT NO. 18                       /X/
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
                               AMENDMENT NO. 19                              /X/
                              -------------------
 
                 DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
        (FORMERLY DEAN WITTER/SEARS U.S. GOVERNMENT MONEY MARKET TRUST)
                        (A MASSACHUSETTS BUSINESS TRUST)
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (212) 392-1600
 
                                BARRY FINK, ESQ.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
                            ------------------------
 
                                    COPY TO:
                            DAVID M. BUTOWSKY, ESQ.
                             GORDON ALTMAN BUTOWSKY
                             WEITZEN SHALOV & WEIN
                              114 WEST 47TH STREET
                            NEW YORK, NEW YORK 10036
                                ----------------
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
 
 As soon as practicable after this Post-Effective Amendment becomes effective.
 
 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
 
        _X_ immediately upon filing pursuant to paragraph (b)
 
        ___ on (date) pursuant to paragraph (b)
 
        ___ 60 days after filing pursuant to paragraph (a)
 
        ___ on (date) pursuant to paragraph (a) of rule 485.
 
           AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS
 
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<PAGE>
                 DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
ITEM                                               CAPTION
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<S>                 <C>
PART A                                            PROSPECTUS
 1.  ............... Cover Page
 
 2.  ............... Prospectus Summary; Summary of Trust Expenses
 
 3.  ............... Financial Highlights
 
 4.  ............... Investment Objective and Policies; The Trust and Its Management; Cover
                     Page; Investment Restrictions; Prospectus Summary
 
 5.  ............... The Trust and Its Management; Back Cover; Investment Objective and
                     Policies
 
 6.  ............... Dividends, Distributions and Taxes; Additional Information
 
 7.  ............... Purchase of Trust Shares; Shareholder Services
 
 8.  ............... Redemption of Trust Shares; Shareholder Services
 
 9.  ............... Not Applicable
 
PART B                               STATEMENT OF ADDITIONAL INFORMATION
10.  ............... Cover Page
 
11.  ............... Table of Contents
 
12.  ............... The Trust and its Management
 
13.  ............... Investment Practices and Policies; Investment Restrictions; Portfolio
                     Transactions and Brokerage
 
14.  ............... The Trust and its Management; Trustees and Officers
 
15.  ............... The Trust and its Management; Trustees and Officers
 
16.  ............... The Trust and its Management; Purchase of Trust Shares; Custodian and
                     Transfer Agent; Independent Accountants
 
17.  ............... Portfolio Transactions and Brokerage
 
18.  ............... Shares of the Trust
 
19.  ............... Purchase of Trust Shares; Redemption of Trust Shares
 
20.  ............... Dividends, Distributions and Taxes
 
21.  ............... Purchase of Trust Shares
 
22.  ............... Dividends, Distributions and Taxes
 
23.  ............... Financial Statements
</TABLE>
 
PART C
 
    Information required to be included in Part C is set forth under the
appropriate item, so numbered, in Part C of this Registration Statement.
<PAGE>
   
              PROSPECTUS
              MARCH 2, 1998
    
 
              Dean Witter U.S. Government Money Market Trust (the "Trust") is a
no-load, open-end diversified management investment company investing primarily
in money market instruments maturing in thirteen months or less which are issued
or guaranteed, as to principal and interest, by the U.S. Government, its
agencies or instrumentalities. The Trust has a Rule 12b-1 Distribution Plan (see
below). The investment objectives of the Trust are security of principal, high
current income and liquidity. (See "Investment Objectives and Policies".)
 
               AN INVESTMENT IN THE TRUST IS NEITHER INSURED NOR GUARANTEED BY
THE U.S. GOVERNMENT. THERE IS NO ASSURANCE THAT THE TRUST WILL BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.
 
               In accordance with a Plan of Distribution pursuant to Rule 12b-1
under the Investment Company Act of 1940 with Dean Witter Distributors Inc. (the
"Distributor"), the Trust is authorized to reimburse for specific expenses
incurred in promoting the distribution of the Trust's shares. Reimbursement may
in no event exceed an amount equal to payments at the annual rate of 0.15% of
the average daily net assets of the Trust.
 
   
               This Prospectus sets forth concisely the information you should
know before investing in the Trust. It should be read and retained for future
reference. Additional information about the Trust is contained in the Statement
of Additional Information, dated March 2, 1998, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Trust at its address or at one of the telephone numbers listed on
this page. The Statement of Additional Information is incorporated herein by
reference.
    
 
<TABLE>
<S>                                            <C>
Minimum initial investment..................   $1,000
Minimum additional investment...............   $   50
</TABLE>
 
   
Dean Witter
U.S. Government Money Market Trust
Two World Trade Center
New York, New York 10048
    
 
    TABLE OF CONTENTS
 
   
Prospectus Summary/2
Summary of Trust Expenses/3
Financial Highlights/4
The Trust and its Management/4
Investment Objectives and Policies/5
Purchase of Trust Shares/7
Shareholder Services/9
Redemption of Trust Shares/13
Dividends, Distributions and Taxes/15
Additional Information/16
Financial Statements--January 31, 1998/18
Report of Independent Accountants/25
    
 
For information about the Trust, including information on opening an account,
registration of shares, and other information relating to a specific account,
call:
  -  800-869-NEWS (toll-free) or
  -  212-392-2550
 
SHARES OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
ENDORSED BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
   
                                                  Dean Witter Distributors Inc.,
                   Distributor
    
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>                 <C>
The                 An open-end diversified management investment company investing primarily in money market instruments maturing
Trust               in thirteen months or less which are issued or guaranteed by the U.S. Government, its agencies or
                    instrumentalities.
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Shares Offered      Shares of beneficial interest of $0.01 par value (see page 16).
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Purchase            Investments may be made:
of Shares           - By wire
                    - By mail
                    - By EasyInvest-SM-
                    - Through Dean Witter Reynolds Inc. account executives and other Selected Broker-Dealers.
                    Purchases are at net asset value, without a sales charge. Minimum initial investment: $1,000. Subsequent
                    investments: $50 or more (by wire or by mail), $1,000 or more (through account executives) or $100 to $5,000 (by
                    EasyInvest).
                    Orders for purchase of shares are effective on day of receipt of payment in Federal Funds if payment is received
                    by the Trust's transfer agent before 12:00 noon New York time (see page 7).
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Investment          To provide security of principal, high current income and liquidity (see page 5).
Objectives
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Investment          A diversified portfolio of U.S. Government securities with short-term maturities (see page 5).
Policy
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Investment          Dean Witter InterCapital Inc., the Investment Manager of the Trust, and its wholly-owned subsidiary, Dean Witter
Manager             Services Company Inc., serve in various investment management, advisory, management and administrative
                    capacities to 101 investment companies and other portfolios with assets of approximately $105 billion at January
                    31, 1998 (see page 4).
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Management          Monthly fee at an annual rate of 1/2 of 1% of average daily net assets up to $500 million, scaled down at
Fee                 various levels of net assets to 1/4 of 1% on assets over $3 billion (see page 5).
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Distributor         Dean Witter Distributors Inc. (the "Distributor") sells shares of the Trust through Dean Witter Reynolds Inc.
                    ("DWR") and other Selected Broker-Dealers pursuant to selected dealer agreements. Other than the reimbursement
                    to the Distributor pursuant to the Rule 12b-1 Distribution Plan, the Distributor receives no distribution fees
                    (see page 7).
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Plan of             The Trust is authorized to reimburse specific expenses incurred in promoting the distribution of the Trust's
Distribution        shares pursuant to a Plan of Distribution with the Distributor pursuant to Rule 12b-1 under the Investment
                    Company Act of 1940. Reimbursement may in no event exceed an amount equal to payments at the annual rate of 0.15
                    of 1% of average daily net assets of the Trust (see page 9).
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Dividends           Declared and automatically reinvested daily in additional shares; cash payments of dividends available monthly
                    (see page 15).
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Reports             Individual periodic account statements; annual and semi-annual Trust financial statements.
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Redemption          Shares are redeemable at net asset value without any charge (see pages 13-15):
of Shares           - By check
                    - By telephone or wire instructions, with proceeds wired or mailed to a predesignated bank account.
                    - By mail
                    - Via an automatic redemption procedure
                    A shareholder's account is subject to possible involuntary redemption if its value falls below $500 (see page
                    14).
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Risks               The Trust invests principally in high quality, short-term fixed income securities issued or guaranteed as to
                    principal and interest by the U.S. Government, its agencies or instrumentalities, which are subject to minimal
                    risk of loss of income and principal. However, the investor is directed to the discussions concerning
                    "repurchase agreements," "reverse repurchase agreements" and "when-issued and delayed delivery securities" on
                    page 6 of the Prospectus and on pages 11 and 12 of the Statement of Additional Information concerning any risks
                    associated with such portfolio securities and management techniques.
</TABLE>
    
 
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  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
         ELSEWHERE IN THE PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL
                                  INFORMATION.
 
                                       2
<PAGE>
SUMMARY OF TRUST EXPENSES
- --------------------------------------------------------------------------------
 
   
    The following table illustrates all expenses and fees that a shareholder of
the Trust will incur. The expenses and fees set forth in the table are for the
fiscal year ended January 31, 1998.
    
 
<TABLE>
<S>                                                                             <C>
SHAREHOLDER TRANSACTION EXPENSES
- ---------------------------------------------------------------------------
Maximum Sales Charge Imposed on Purchases..................................     None
Maximum Sales Charge Imposed on Reinvested Dividends.......................     None
Deferred Sales Charge......................................................     None
Redemption Fees............................................................     None
Exchange Fee...............................................................     None
</TABLE>
 
   
<TABLE>
<S>                                                                             <C>
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- ---------------------------------------------------------------------------
Management Fees............................................................      0.46%
12b-1 Fees*................................................................      0.10%
Other Expenses.............................................................      0.46%
Total Fund Operating Expenses..............................................      1.02%
</TABLE>
    
 
- ------------
* THE 12b-1 FEE IS CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL
  ASSOCIATION OF SECURITIES DEALERS, INC. ("NASD") GUIDELINES (SEE "PURCHASE OF
  TRUST SHARES").
 
   
<TABLE>
<CAPTION>
EXAMPLE                                                                   1 Year       3 Years      5 Years     10 Years
- ----------------------------------------------------------------------  -----------  -----------  -----------  -----------
<S>                                                                     <C>          <C>          <C>          <C>
You would pay the following expenses on a $1,000 investment, assuming
 (1) 5% annual return and (2) redemption at the end of each time
 period:..............................................................   $      10    $      32    $      56    $     124
</TABLE>
    
 
    THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE TRUST MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
    The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Trust will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Trust and its Management" and "Purchase of Trust Shares" in this
Prospectus.
 
                                       3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
   
    The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by Price Waterhouse LLP,
independent accountants. The financial highlights should be read in conjunction
with the financial statements, the notes thereto and the unqualified report of
independent accountants which are contained in this Prospectus commencing on
page 18.
    
 
   
<TABLE>
<CAPTION>
                                                                 FOR THE YEAR ENDED JANUARY 31,
                               --------------------------------------------------------------------------------------------------
                                 1998      1997      1996      1995      1994      1993      1992      1991      1990      1989
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
<S>                            <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value, beginning of
 period....................... $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Net investment income.........    0.046     0.043     0.049     0.034     0.023     0.029     0.050     0.070     0.082     0.068
Less dividends from net
 investment income............   (0.046)   (0.043)   (0.049)   (0.034)   (0.023)   (0.029)   (0.050)   (0.070)   (0.082)   (0.068)
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
Net asset value, end of
 period....................... $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00  $   1.00
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
TOTAL INVESTMENT RETURN+......    4.67%     4.41%     5.00%     3.47%     2.28%     2.89%     5.14%     7.20%     8.59%     7.02%
RATIOS TO AVERAGE NET ASSETS:
Expenses......................    1.02%     1.11%     1.09%     1.08%     1.00%     0.93%     0.89%     0.99%     0.83%     0.87%
Net investment income.........    4.53%     4.29%     4.86%     3.38%     2.23%     2.87%     5.02%     6.97%     8.19%     6.77%
SUPPLEMENTAL DATA:
Net assets, end of period, in
 millions.....................     $891      $927      $903      $809      $818    $1,027    $1,115    $1,217      $873      $661
</TABLE>
    
 
- ------------
 
   
<TABLE>
<S>  <C>
+    Calculated based on the net asset value as of the last business day of the
     period.
</TABLE>
    
 
   
                       SEE NOTES TO FINANCIAL STATEMENTS
    
 
THE TRUST AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Dean Witter U.S. Government Money Market Trust (the "Trust") is an open-end
diversified management investment company which was organized under the laws of
the Commonwealth of Massachusetts as a business trust on November 18, 1981.
 
   
    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the
Trust's Investment Manager. The Investment Manager, which was incorporated in
July, 1992, is a wholly-owned subsidiary of Morgan Stanley, Dean Witter,
Discover & Co., a preeminent global financial services firm that maintains
leading market positions in each of its three primary businesses--securities,
asset management and credit services.
    
 
   
    InterCapital and its wholly-owned subsidiary, Dean Witter Services Company
Inc., serve in various investment management, advisory, management and
administrative capacities to a total of 101 investment companies, 29 of which
are listed on the New York Stock Exchange, with combined total assets of
approximately $101 billion at January 31, 1998. The Investment Manager also
manages portfolios of pension plans, other institutions and individuals which
aggregated approximately $4 billion at such date.
    
 
    The Trust has retained the Investment Manager to provide administrative
services, manage its business affairs and manage the investment of the Trust's
assets, including the placing of orders for the purchase and sale of portfolio
securities. InterCapital has retained Dean Witter Services Company Inc. to
perform the aforementioned administrative services for the Trust. The Trust's
Trustees review the various services provided by or under the direction of the
Investment Manager to ensure that the
 
                                       4
<PAGE>
Trust's general investment policies and programs are being properly carried out
and that administrative services are being provided to the Trust in a
satisfactory manner.
 
   
    As full compensation for the services and facilities furnished to the Trust
and expenses of the Trust assumed by the Investment Manager, the Trust pays the
Investment Manager monthly compensation calculated daily at an annual rate of
0.50% of the daily net assets of the Trust up to $500 million, scaled down at
various asset levels to 0.25% on assets over $3 billion. For the fiscal year
ended January 31, 1998, the Trust accrued total compensation to the Investment
Manager amounting to 0.46% of the Trust's average daily net assets and the
Trust's total expenses amounted to 1.02% of the Trust's average daily net
assets.
    
 
INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
 
    The investment objectives of the Trust are security of principal, high
current income and liquidity.
 
    The Trust seeks to achieve its objectives by investing in U.S. Government
securities, including a variety of securities which are issued or guaranteed, as
to principal and interest, by the United States Treasury, by various agencies of
the United States Government, and by various instrumentalities which have been
established or sponsored by the United States Government, and in certain
interests in the foregoing securities. Except for U.S. Treasury securities,
these obligations, even those which are guaranteed by Federal agencies or
instrumentalities, may or may not be backed by the "full faith and credit" of
the United States. In the case of securities not backed by the full faith and
credit of the United States, they may be backed, in part, by a line of credit
with the U.S. Treasury (such as the Federal National Mortgage Association), or
the Trust must look to the agency issuing or guaranteeing the obligation for
ultimate repayment (such as securities of the Federal Farm Credit System), in
which case the Trust may not be able to assert a claim against the United States
itself in the event the agency or instrumentality does not meet its commitments.
 
    Treasury securities include Treasury bills, Treasury notes, and Treasury
bonds. Some of the government agencies and instrumentalities which issue or
guarantee securities include the Federal Farm Credit System, the Federal Home
Loan Banks, the Federal Home Loan Mortgage Corporation, the Government National
Mortgage Association, the Federal National Mortgage Association, the Farmers
Home Administration, the Federal Land Banks, the Small Business Administration,
the Student Loan Marketing Association, the Export-Import Bank, the Federal
Intermediate Credit Banks, the Tennessee Valley Authority and the Banks for
Cooperatives.
 
    The Trust may invest in securities issued or guaranteed, as to principal and
interest, by any of the foregoing entities or by any other agency or
instrumentality established or sponsored by the United States Government. Such
investments may take the form of participation interests in, and may be
evidenced by deposit or safekeeping receipts for, any of the foregoing.
Participation interests are pro rata interests in U.S. Government securities
such as interests in pools of mortgages sold by the Government National Mortgage
Association; instruments evidencing deposit or safekeeping are documentary
receipts for such original securities held in custody by others.
 
    The Federal Deposit Insurance Corporation is the administrative authority
over the Bank Insurance Fund and the Savings Association Insurance Fund, which
are the agencies of the U.S. Government which insure (including both principal
and interest) the deposits of certain banks and savings and loan associations up
to $100,000 per deposit. Current federal regulations also permit such
institutions to issue insured negotiable certificates of deposit ("CDs") in
principal amounts of $100,000 or more
 
                                       5
<PAGE>
without regard to the interest rate ceilings on other deposits. To remain fully
insured as to principal, these investments must currently be limited to $100,000
per bank or savings and loan association. The interest on such investments is
not insured. The Trust may invest in such CDs of banks and savings and loan
institutions limited to the insured amount of principal ($100,000) in each case
and limited with regard to all such CDs and all illiquid assets, in the
aggregate, to 10% of the Trust's total assets.
 
    The Trust intends normally to hold its portfolio securities to maturity.
Historically, securities issued or guaranteed by the U.S. Government or its
agencies and instrumentalities have involved minimal risk of loss of principal
or interest, if held to maturity.
 
    The investment objectives and policies stated above may not be changed
without shareholder approval. There is no assurance that the Trust's objectives
will be achieved.
 
PORTFOLIO MANAGEMENT
 
   
    REPURCHASE AGREEMENTS.  When cash may be available for only a few days, it
may be invested by the Trust in repurchase agreements until such time as it may
otherwise be invested or used for payments of obligations of the Trust. A
repurchase agreement may be viewed as a type of secured lending by the Trust
which typically involves the acquisition by the Trust of government securities
from a selling financial institution such as a bank, savings and loan
association or broker-dealer. The agreement provides that the Trust will sell
back to the institution, and that the institution will repurchase, the
underlying security ("collateral") at a specified price and at a fixed time in
the future. The Trust will accrue interest from the institution until the time
when the repurchase is to occur. Although such date is deemed by the Trust to be
the maturity date of a repurchase agreement, the maturities of securities
subject to repurchase agreements are not subject to any limits and may exceed
thirteen months. While repurchase agreements involve certain risks not
associated with direct investments in U.S. Government securities, the Trust
follows procedures designed to minimize such risks. These procedures include
effecting repurchase transactions only with large, well capitalized and well
established financial institutions and specifying the required value of the
collateral underlying the agreement.
    
 
    REVERSE REPURCHASE AGREEMENTS.  The Trust may also use reverse repurchase
agreements as part of its investment strategy. Reverse repurchase agreements
involve sales by the Trust of portfolio assets concurrently with an agreement by
the Trust to repurchase the same assets at a later date at a fixed price.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES. The Trust may purchase
securities on a when-issued or delayed delivery basis; i.e., delivery and
payment can take place a month or more after the date of the transaction. These
securities are subject to market fluctuation and no interest accrues to the
purchaser during this period. At the time the Trust makes the commitment to
purchase securities on a when-issued or delayed delivery basis, it will record
the transaction and thereafter reflect the value, each day, of such security in
determining its net asset value. The Trust will not purchase securities on a
when-issued or delayed delivery basis if, as a result, more than 15% of the
Trust's net assets would be so invested.
 
    The Trust will generally not seek profits through short-term trading,
although it may dispose of any portfolio security prior to maturity if, on the
basis of a revised evaluation or other circumstance or consideration, the
Investment Manager deems such disposition advisable.
 
    The Trust will attempt to balance its objectives of security of principal,
high current income and liquidity by investing in securities of varying
maturities and risks. The Trust will not, however, invest in securities with an
effective maturity of more than thirteen months from the date of purchase (see
"Purchase of Trust Shares--Determination of Net Asset Value"). The amounts
invested in obligations of various maturities of thirteen months or less will
depend on management's evaluation of the risks
 
                                       6
<PAGE>
involved. Longer-term U.S. Government issues, while generally paying higher
interest rates, are subject to greater fluctuations in value resulting from
general changes in interest rates than shorter-term issues. Thus, when rates on
new securities increase, the value of outstanding securities may decline, and
vice versa. Such changes may also occur, to a lesser degree, with short-term
issues. These changes, if realized, may cause fluctuations in the amount of
daily dividends and, in extreme cases, could cause the net asset value per share
to decline (see "Purchase of Trust Shares--Determination of Net Asset Value").
In the event of unusually large redemption demands, such securities may have to
be sold at a loss prior to maturity, or the Trust might have to borrow money and
incur interest expenses. Either occurrence would adversely impact upon the
amount of daily dividend and could result in a decline in daily net asset value
per share or the redemption by the Trust of shares held in a shareholder's
account. The Trust will attempt to minimize these risks by investing in
relatively longer-term securities when it appears to management that yields on
such securities are not likely to increase substantially during the period of
expected holding, and then only in securities which are readily marketable.
However, there can be no assurance that the Trust will be successful in
achieving this objective.
 
   
    Notwithstanding any other investment policy or restriction, the Trust may
seek to achieve its investment objectives by investing all or substantially all
of its assets in another investment company having substantially the same
investment objectives and policies as the Trust.
    
 
   
    BROKERAGE ALLOCATION.  Brokerage commissions are not normally charged on the
purchase or sale of money market instruments such as U.S. Government
obligations, but such transactions may involve transaction costs in the form of
spreads between bid and asked prices. Pursuant to an order of the Securities and
Exchange Commission, the Trust may effect principal transactions in certain
money market instruments with Dean Witter Reynolds Inc. ("DWR"), a broker-dealer
affiliate of InterCapital. In addition, the Trust may incur brokerage
commissions on transactions conducted through DWR, Morgan Stanley & Co.
Incorporated and other broker-dealer affiliates of InterCapital.
    
 
PURCHASE OF TRUST SHARES
- --------------------------------------------------------------------------------
 
   
    The Trust offers its shares for sale to the public on a continuous basis,
without a sales charge. Pursuant to a Distribution Agreement between the Trust
and Dean Witter Distributors Inc. (the "Distributor"), shares of the Trust are
distributed by the Distributor and offered by DWR and other dealers who have
entered into selected dealer agreements with the Distributor ("Selected
Broker-Dealers"). The principal executive office of the Distributor is located
at Two World Trade Center, New York, New York 10048. The offering price of the
shares will be at their net asset value next determined (see "Determination of
Net Asset Value" below) after receipt of a purchase order and acceptance by the
Trust's transfer agent, Dean Witter Trust FSB (the "Transfer Agent"), in proper
form and accompanied by payment in Federal Funds (i.e., monies of member banks
within the Federal Reserve System held on deposit at a Federal Reserve Bank)
available to the Trust for investment. Shares commence earning income on the day
following the date of purchase.
    
 
   
    To initiate purchase by mail or wire, a completed Investment Application
(contained in the Prospectus) must be sent to the Transfer Agent at P.O. Box
1040, Jersey City, NJ 07303. Checks should be made payable to Dean Witter U.S.
Government Money Market Trust and sent to the Transfer Agent at the above
address. Purchases by wire must be preceded by a call to the Transfer Agent
advising it of the purchase (see Investment Application or the front cover of
this Prospectus for the telephone number) and must be wired to The Bank of New
York for credit to the Account of Dean Witter Trust FSB, Harborside Financial
Center, Plaza Two,
    
 
                                       7
<PAGE>
   
Jersey City, NJ, Account No. 8900188413. Wire purchase instructions must include
the name of the Trust and the shareholder's account number. Purchases made by
check are normally effective within two business days for checks drawn on
Federal Reserve System member banks, and longer for most other checks. Wire
purchases received by the Transfer Agent prior to 12:00 noon, New York time, on
any business day are normally effective that day and wire purchases received
after 12:00 noon, New York time, are normally effective the next business day.
Initial investments by mail or wire must be at least $1,000. The minimum initial
purchase in the case of an "Education IRA" is $500, if the Distributor has
reason to believe that additional investments will increase the investment in
the account to $1,000 within three years. Subsequent investments must be $50 or
more and may be made through the Transfer Agent. In the case of investments
pursuant to (i) Systematic Payroll Deduction Plans (including Individual
Retirement Plans), (ii) the InterCapital mutual fund asset allocation program
and (iii) fee-based programs approved by the Distributor, pursuant to which
participants pay an asset based fee for services in the nature of investment
advisory or administrative services, the Trust, in its discretion, may accept
investments without regard to any minimum amounts which would otherwise be
required, provided, in the case of Systematic Payroll Deduction Plans, that the
Distributor has reason to believe that additional investments will increase the
investment in all accounts under such Plans to at least $1,000. The Trust will
waive the minimum initial investment for the automatic reinvestment of
distributions from certain Unit Investment Trusts. The Trust and the Distributor
reserve the right to reject any purchase order.
    
 
    Sales personnel of a Selected Broker-Dealer are compensated for shares of
the Trust sold by them by the Distributor or any of its affiliates and/or the
Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer will receive various types of non-cash compensation as special
sales incentives, including trips, educational and/or business seminars and
merchandise.
 
    Orders for the purchase of Trust shares placed by customers through DWR or
other Selected Broker-Dealers with payment in clearing house funds will be
transmitted to the Trust with payment in Federal Funds on the business day
following the day the order is placed by the customer with DWR or another
Selected Broker-Dealer. Investors desiring same day effectiveness should wire
Federal Funds directly to the Transfer Agent. An order procedure exists pursuant
to which customers of DWR and other Selected Broker-Dealers can, upon request:
(a) have the proceeds from the sale of listed securities invested in shares of
the Trust on the day following the day the customer receives such proceeds in
his or her DWR or other Selected Broker-Dealer brokerage account; and (b) pay
for the purchase of certain listed securities by automatic liquidation of Trust
shares owned by the customer. In addition, there is an automatic purchase
procedure whereby consenting DWR or other Selected Broker-Dealer customers who
are shareholders of the Trust will have free cash credit balances in their DWR
or other Selected Broker-Dealer brokerage accounts as of the close of business
(4:00 p.m., New York time) on the last business day of each week (where such
balances do not exceed $5,000) automatically invested in shares of the Trust the
next business day. Investors with free cash credit balances (i.e., immediately
available funds) in brokerage accounts at DWR or other Selected Broker-Dealers
will not have any of such funds invested in the Trust until the business day
after the customer places an order with DWR or another Selected Broker-Dealer to
purchase shares of the Trust and will not receive the daily dividend which would
have been received had such funds been invested in the Trust on the day the
order was placed with DWR or other Selected Broker-Dealer. Accordingly, DWR or
other Selected Broker-Dealers may have the use of such free credit balances
during such period.
 
                                       8
<PAGE>
PLAN OF DISTRIBUTION
 
   
    In accordance with a Plan of Distribution between the Trust and the
Distributor, pursuant to Rule 12b-1 under the Act, certain services and
activities in connection with the distribution of the Trust's shares are
reimbursable expenses. The principal activities and services which may be
provided by the Distributor, DWR, its affiliates and other Selected
Broker-Dealers under the Plan include: (1) compensation to, and expenses of,
DWR's and other Selected Broker-Dealers' account executives and other employees,
including overhead and telephone expenses; (2) sales incentives and bonuses to
sales representatives and marketing personnel in connection with promoting sales
of the Trust's shares; (3) expenses incurred in connection with promoting sales
of the Trust's shares; (4) preparing and distributing sales literature; and (5)
providing advertising and promotional activities, including direct mail
solicitation and television, radio, newspaper, magazine and other media
advertisements. Reimbursements for these services may be made in monthly
payments by the Trust, which in no event exceed an amount equal to a payment at
the annual rate of 0.15 of 1% of the Trust's average daily net assets. For its
fiscal year ended January 31, 1998, the fee paid was accrued at the annual rate
of 0.10 of 1% of the Trust's average daily net assets. Expenses incurred
pursuant to the Plan in any fiscal year will not be reimbursed by the Trust
through payments accrued in any subsequent fiscal year.
    
 
DETERMINATION OF NET ASSET VALUE
 
    The net asset value per share of the Trust is determined as of 4:00 p.m.,
New York time (or, on days when the New York Stock Exchange closes prior to 4:00
p.m., at such earlier time), on each day that the New York Stock Exchange is
open by taking the value of all assets of the Trust, subtracting its liabilities
and dividing the result by the number of shares outstanding. The net asset value
per share will not be determined on Good Friday and on such other federal and
non-federal holidays as are observed by the New York Stock Exchange.
 
    The Trust utilizes the amortized cost method in valuing its portfolio
securities, which method involves valuing a security at its cost adjusted by 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. The
purpose of this method of calculation is to facilitate the maintenance of a
constant net asset value per share of $1.00. However, there is no assurance that
the $1.00 net asset value will be maintained.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan is available for
shareholders who own or purchase shares of the Trust having a minimum value of
at least $5,000. The plan provides for monthly or quarterly (March, June,
September, December) checks in any dollar amount, not less than $25, or in any
whole percentage of the account balance, on an annualized basis. The shares will
be redeemed at their net asset value, determined at the shareholder's option, on
the tenth or twenty-fifth day (or next business day) of the relevant month or
quarter and normally a check for the proceeds will be mailed by the Transfer
Agent, or amounts credited to a shareholder's DWR or other Selected Broker-
Dealer brokerage account, within five days after the date of redemption. A
shareholder wishing to make this election should do so on the Investment
Application. The withdrawal plan may be terminated at any time by the Trust.
 
    TARGETED DIVIDENDS.  In states where it is legally permissible, shareholders
may elect to have all shares of the Trust earned as a result of dividends paid
in any given month redeemed as of the end of the month and invested in shares of
any other designated open-end investment company for which InterCapital serves
as investment manager (collectively, with the Trust, the "Dean Witter Funds"),
other than Dean Witter U.S. Government
 
                                       9
<PAGE>
   
Money Market Trust, at the net asset value per share of the selected Dean Witter
Fund determined as of the last business day of the month, without the imposition
of any applicable front-end sales charge or without the imposition of any
applicable contingent deferred sales charge upon ultimate redemption. All such
shares invested will begin to earn dividends, if any, in the selected Dean
Witter Fund on the first business day of the succeeding month. Shareholders of
the Trust must be shareholders of the selected Class of the Dean Witter Fund
targeted to receive investments from dividends at the time they enter the
Targeted Dividends program. Investors should review the prospectus of the
targeted Dean Witter Fund before entering the program.
    
 
    EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic
purchase plan which provides for any amount from $100 to $5,000 to be
transferred automatically from a checking or savings account, on a semi-monthly,
monthly or quarterly basis, to the Transfer Agent for investment in shares of
the Trust. Shares purchased through EasyInvest will be added to the
shareholder's existing account at the net asset value calculated the same
business day the transfer of funds is effected.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
    TAX SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
the self-employed, Individual Retirement Accounts and Custodial Accounts under
Section 403(b)(7) of the Internal Revenue Code. Adoption of such plans should be
on advice of legal counsel or tax adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their DWR or other Selected Broker-
Dealer account executive or the Transfer Agent.
 
    SYSTEMATIC PAYROLL DEDUCTION PLAN.  There is also available to employers a
Systematic Payroll Deduction Plan by which their employees may invest in the
Trust. For further information, investors should contact their DWR or other
Selected Broker-Dealer account executive or the Transfer Agent.
 
   
    EXCHANGE PRIVILEGE.  An "Exchange Privilege", that is, the privilege of
exchanging shares of certain Dean Witter Funds for shares of the Trust, exists
whereby shares of Dean Witter Funds that are multiple class funds ("Dean Witter
Multi-Class Funds"), shares of Dean Witter Multi-State Municipal Series Trust
and Dean Witter Hawaii Municipal Trust, which are Dean Witter Funds sold with a
front-end sales charge ("FSC Funds"), and shares of Dean Witter Global
Short-Term Income Fund Inc. ("Global Short-Term"), which is a Dean Witter Fund
offered with a contingent deferred sales charge ("CDSC"), may be exchanged for
shares of the Trust, Dean Witter Liquid Asset Fund Inc., Dean Witter Tax-Free
Daily Income Trust, Dean Witter California Tax-Free Daily Income Trust and Dean
Witter New York Municipal Money Market Trust (which five funds are called "money
market funds") and for shares of Dean Witter Short-Term U.S. Treasury Trust,
Dean Witter Limited Term Municipal Trust, Dean Witter Short-Term Bond Fund and
Dean Witter Intermediate Term U.S. Treasury Trust (which nine funds, including
the Trust, are referred to herein as the "Exchange Funds"). Shares of the
Exchange Funds received in an exchange for shares of a Dean Witter Multi-Class
Fund may be redeemed and exchanged only for shares of the corresponding Class of
a Dean Witter Multi-Class Fund or for shares of one of the other Exchange Funds,
provided that shares of the Exchange Funds received in an exchange for Class A
shares of a Dean Witter Multi-Class Fund may also be redeemed and exchanged for
shares of a FSC Fund, and shares of the Exchange Funds received in an exchange
for Class B shares of a Dean Witter Multi-Class Fund may also be redeemed and
exchanged for shares of Global Short-Term. In addition, shares of the Exchange
Funds received in an exchange for shares of a FSC
    
 
                                       10
<PAGE>
   
Fund may be redeemed and exchanged for Class A shares of a Dean Witter
Multi-Class Fund or for shares of one of the other Exchange Funds, and shares of
the Exchange Funds received in an exchange for shares of Global Short-Term may
be redeemed and exchanged for Class B shares of a Dean Witter Multi-Class Fund
or for shares of one of the other Exchange Funds.
    
 
   
    When exchanging into a money market fund, shares of the Multi-Class Fund,
the FSC Fund, Global Short-Term or the Exchange Fund are redeemed at their next
calculated net asset value and exchanged for shares of the money market fund at
their net asset value determined the following business day. An exchange to an
Exchange Fund that is not a money market fund is on the basis of the next
calculated net asset value per share of each fund after the exchange order is
received. Ultimately, any applicable CDSC will have to be paid upon redemption
of shares originally purchased from Global Short-Term or a Class of a Dean
Witter Multi-Class Fund that imposes a CDSC. (If shares of an Exchange Fund
received in exchange for shares originally purchased from Global Short-Term or
Class B of a Dean Witter Multi-Class Fund are exchanged for shares of Global
Short-Term or another Dean Witter Multi-Class Fund having a different CDSC
schedule from that of Global Short-Term or the Dean Witter Multi-Class Fund from
which the Exchange Fund shares were acquired, the shares will be subject to the
higher CDSC schedule.) During the period of time the shares originally purchased
from Global Short-Term or from a Class of a Dean Witter Multi-Class Fund that
imposes a CDSC remain in the Exchange Fund (calculated from the last day of the
month in which the Exchange Fund shares were acquired), the holding period (for
the purpose of determining the rate of the CDSC) is frozen. If those shares are
subsequently reexchanged for shares of a Dean Witter Multi-Class Fund or Global
Short-Term, the holding period previously frozen when the first exchange was
made resumes on the last day of the month in which shares of a Dean Witter
Multi-Class Fund or shares of Global Short-Term are reacquired. Thus, the CDSC
is based upon the time (calculated as described above) the shareholder was
invested in shares of a Dean Witter Multi-Class Fund or in shares of Global
Short-Term. In the case of exchanges of Class A shares of a Dean Witter Multi-
Class Fund that are subject to a CDSC, the holding period also includes the time
(calculated as described above) the shareholder was invested in shares of a FSC
Fund. In the case of shares exchanged into an Exchange Fund on or after April
23, 1990, upon a redemption of shares which results in a CDSC being imposed, a
credit (not to exceed the amount of the CDSC) will be given in an amount equal
to the Exchange Fund 12b-1 distribution fees, if any, incurred on or after that
date which are attributable to those shares (see "Purchase of Fund (Trust)
Shares--Plan of Distribution" in the respective Exchange Fund Prospectus for a
description of Exchange Fund distribution fees). Exchanges may be made after the
shares of the fund acquired by purchase (not by exchange or dividend
reinvestment) have been held for thirty days. There is no waiting period for
exchanges of shares acquired by exchanges or dividend reinvestment.
    
 
    Exchange Privilege accounts may also be maintained for shareholders of the
money market funds who acquired their shares in exchange for shares of various
TCW/DW Funds, a group of funds distributed by the Distributor for which TCW
Funds Management, Inc. serves as Adviser, under the terms and conditions
described in the Prospectus and Statement of Additional Information of each
TCW/DW Fund.
 
   
    ADDITIONAL INFORMATION REGARDING EXCHANGES. Purchases and exchanges should
be made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Investment Manager to be abusive and contrary to the best
interests of the Trust and its other shareholders and, at the Investment
Manager's discretion, may be limited by the Trust's refusal to accept additional
purchases and/or exchanges from the investor. Although the
    
 
                                       11
<PAGE>
Trust does not have any specific definition of what constitutes a pattern of
frequent exchanges, and will consider all relevant factors in determining
whether a particular situation is abusive and contrary to the best interests of
the Trust and its other shareholders, investors should be aware that the Trust
and each of the other Funds may in their discretion limit or otherwise restrict
the number of times this Exchange Privilege may be exercised by any investor.
Any such restriction will be made by the Trust on a prospective basis only, upon
notice to the shareholder not later than ten days following such shareholder's
most recent exchange.
 
   
    The Exchange Privilege may be terminated or revised at any time by the Trust
and/or any of such Funds for which shares of the Trust may be exchanged, upon
such notice as may be required by applicable regulatory agencies (presently
sixty days' prior written notice for termination or material revision), provided
that six months' prior written notice of termination will be given to the
shareholders who hold shares of Exchange Funds or
TCW/DW North American Government Income Trust pursuant to the Exchange
Privilege, and provided further that the Exchange Privilege may be terminated or
materially revised without notice under certain unusual circumstances.
Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions on
exchange of shares of the Trust pledged in their margin account.
    
 
   
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain one and read it carefully before
investing. Exchanges are subject to the minimum investment requirement of each
Class of shares and any other conditions imposed by each fund. An exchange will
be treated for federal income tax purposes the same as a repurchase or
redemption of shares on which the shareholder has realized a capital gain or
loss. However, the ability to deduct capital losses on an exchange may be
limited in situations where there is an exchange of shares within ninety days
after the shares are purchased. The Exchange Privilege is only available in
states where an exchange may legally be made.
    
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Trust for shares of any of the above Funds
pursuant to this Exchange Privilege by contacting their account executive (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those who are clients of DWR or another Selected Broker-Dealer but who wish to
make exchanges directly by telephoning the Transfer Agent) must complete and
forward to the Transfer Agent an Exchange Privilege Authorization Form, copies
of which may be obtained from the Trust, to initiate an exchange. If the
Authorization Form is used, exchanges may be made in writing or by contacting
the Transfer Agent at (800) 869-NEWS (toll-free).
 
    The Trust will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. Such procedures may
include requiring various forms of personal identification such as name, mailing
address, social security or other tax identification number and DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Trust may be liable for
any losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege form and who is unable to reach the Trust
by telephone should contact his or her DWR or other Selected Broker-Dealer
account executive, if appropriate, or make a written exchange request.
Shareholders are advised that during periods of drastic economic or market
changes it is possible that the telephone exchange procedures may be difficult
to implement, although
 
                                       12
<PAGE>
this has not been the experience of the Dean Witter Funds in the past.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about the
Exchange Privilege.
 
REDEMPTION OF TRUST SHARES
- --------------------------------------------------------------------------------
 
    A shareholder may withdraw all or any of his or her investments at any time,
without penalty or charge, by redeeming shares through the Transfer Agent at the
net asset value per share next determined (see "Purchase of Trust
Shares--Determination of Net Asset Value") after the receipt of a redemption
request meeting the applicable requirements as follows (all of which are subject
to the General Redemption Requirements set forth below).
 
1.  BY CHECK
 
    The Transfer Agent will supply blank checks to any shareholder who has
requested them on an Investment Application. The shareholder may make checks
payable to the order of anyone in any amount not less than $500 (checks written
in amounts under $500 will not be honored by the Transfer Agent). Shareholders
must sign checks exactly as their shares are registered. If the account is a
joint account, the check may contain one signature unless the joint owners have
specified on an Investment Application that all owners are required to sign
checks.
 
    Shares will be redeemed at their net asset value next determined (See
"Purchase of Trust Shares-- Determination of Net Asset Value") after receipt by
the Transfer Agent of a check which does not exceed the value of the account.
Payment of the proceeds of a check will normally be made on the next business
day after receipt by the Transfer Agent of the check in proper form. Shares
purchased by check (including a certified or bank cashier's check) are not
normally available to cover redemption checks until fifteen days after receipt
of the check used for investment by the Transfer Agent. The Transfer Agent will
not honor a check in an amount exceeding the value of the account at the time
the check is presented for payment.
 
2.  BY TELEPHONE OR WIRE INSTRUCTIONS WITH
PAYMENT TO PREDESIGNATED BANK ACCOUNT
 
    A shareholder may redeem shares by telephoning or sending wire instructions
to the Transfer Agent. Payment will be made by the Transfer Agent to the
shareholder's bank account at any commercial bank designated by the shareholder
in an Investment Application, by wire if the amount is $1,000 or more and the
shareholder so requests, and otherwise by mail. Normally, the Transfer Agent
will transmit payment the next business day following receipt of a request for
redemption in proper form.
 
    DWR and other participating Selected Broker-Dealers have informed the
Distributor and the Trust that, on behalf of and as agent for their customers
who are shareholders of the Trust, they will transmit to the Trust requests for
redemption of shares owned by their customers. In such cases, the Transfer Agent
will wire proceeds of redemptions to DWR's or another Selected Broker-Dealer's
bank account for credit to the shareholders' accounts the following business
day. DWR and other participating Selected Broker-Dealers have also informed the
Distributor and the Trust that they do not charge for this service.
 
    Redemption instructions must include the shareholder's name and account
number and be wired or called to the Transfer Agent:
    --800-869-NEWS (toll-free)
    --Telex No. 125076
 
                                       13
<PAGE>
3.  BY MAIL
 
   
    A shareholder may redeem shares by sending a letter to Dean Witter Trust
FSB, P.O. Box 983, Jersey City, NJ 07303, requesting redemption.
    
 
    Redemption proceeds will be mailed to the shareholder at his or her
registered address or mailed or wired to his or her predesignated bank account,
as requested. Proceeds of redemption may also be sent to some other person, as
requested by the shareholder.
 
GENERAL REDEMPTION REQUIREMENTS
 
   
    Written requests for redemption must be signed by the registered
shareholder(s). If the proceeds are to be paid to anyone other than the
registered shareholder(s) or sent to any address other than the shareholder's
registered address or predesignated bank account, signatures must be guaranteed
by an eligible guarantor acceptable to the Transfer Agent (shareholders should
contact the Transfer Agent for a determination as to whether a particular
institution is such an eligible guarantor), except in the case of redemption by
check. Additional documentation may be required where shares are held by a
corporation, partnership, trustee or executor. With regard to shares of the
Trust acquired pursuant to the Exchange Privilege, any applicable CDSC will be
imposed upon the redemption of such shares (see "Purchase of Trust
Shares--Exchange Privilege").
    
 
   
    All requests for redemption should be sent to Dean Witter Trust FSB, P.O.
Box 983, Jersey City, NJ 07303.
    
 
    Generally, the Trust will attempt to make payment for all redemptions within
one business day, but in no event later than seven days after receipt of such
redemption request in proper form. However, if the shares being redeemed were
purchased by check (including a certified or bank cashier's check), payment may
be delayed for the minimum time needed to verify that the check used for
investment has been honored (not more than fifteen days from the time of
investment of the check by the Transfer Agent). In addition, the Trust may
postpone redemptions at certain times when normal trading is not taking place on
the New York Stock Exchange.
 
    The Trust reserves the right, on sixty days' notice, to redeem at net asset
value the shares of any shareholder (other than shares held in an Individual
Retirement Account or custodial account under Section 403(b)(7) of the Internal
Revenue Code) whose shares due to redemptions by the shareholder have a value of
less than $500, or such lesser amount as may be fixed by the Board of Trustees.
 
AUTOMATIC REDEMPTION PROCEDURE
 
    The Distributor has instituted an automatic redemption procedure which it
may utilize to satisfy amounts due by a shareholder maintaining a brokerage
account with DWR or another Selected Broker-Dealer as a result of purchases of
securities or other transactions in the shareholder's brokerage account. Under
this procedure, if the shareholder elects to participate by so notifying DWR or
another Selected Broker-Dealer, the shareholder's DWR or other Selected
Broker-Dealer brokerage account will be scanned each business day prior to the
close of business (4:00 p.m., New York time). After application of any cash
balances in the account, a sufficient number of Trust shares may be redeemed at
the close of business to satisfy any amounts for which the shareholder is
obligated to make payment to DWR or another Selected Broker-Dealer. Redemptions
will be effected on the business day preceding the date the shareholder is
obligated to make such payment, and DWR or another Selected Broker-Dealer will
receive the redemption proceeds on the day following the redemption date.
Shareholders will receive all dividends declared and reinvested through the date
of redemption.
 
   
EASYINVEST-SM---AUTOMATIC REDEMPTION
    
 
   
    Shareholders may invest in shares of certain other Dean Witter Funds by
subscribing to EasyInvest, an automatic purchase plan which provides for the
automatic investment of any amount from $100 to $5,000 in shares of the
specified fund.
    
 
                                       14
<PAGE>
   
Under EasyInvest, a shareholder may direct that a sufficient number of shares of
the Trust be automatically redeemed and the proceeds transferred automatically
to the Dean Witter Funds' Transfer Agent, on a semi-monthly, monthly or
quarterly basis, for investment in shares of the specified fund. Redemptions
will be effected on the business day preceding the investment date and the
Transfer Agent will receive the proceeds for investment on the day following the
redemption date.
    
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Trust declares dividends, payable on each
day the New York Stock Exchange is open for business, of all of its daily net
investment income (and net short-term capital gains, if any) to shareholders of
record as of the close of business the preceding business day. The amount of
dividend may fluctuate from day to day and may be omitted on some days if net
realized losses on portfolio securities exceed the Trust's net investment
income. Dividends are automatically reinvested daily in additional full and
fractional shares of the Trust (rounded to the last 1/100 of a share) at the net
asset value per share at the close of business on that day. Any dividends
declared in the last quarter of any calendar year which are paid in the
following year prior to February 1 will be deemed received by the shareholder in
the prior calendar year.
 
    Shareholders may instruct the Transfer Agent (in writing) to have their
dividends paid out monthly in cash. For such shareholders, the shares reinvested
and credited to their account during the month will be redeemed as of the close
of business on the monthly payment date (which will be no later than the last
business day of the month) and the proceeds will be paid to them by check.
Processing of dividend checks begins immediately following the monthly payment
date. Shareholders who have requested to receive dividends in cash will normally
receive their monthly dividend check during the first ten days of the following
month.
 
    TAXES.  Because the Trust intends to distribute substantially all of its net
investment income and net capital gains, if any, to shareholders and intends to
otherwise comply with all of the provisions of Subchapter M of the Internal
Revenue Code to qualify as a regulated investment company, it is not expected
that the Trust will be required to pay any federal income tax.
 
    Distributions of net investment income and realized net short-term capital
gains, if any, are taxable to shareholders subject to tax on their income as
ordinary dividend income, whether such distributions are taken in cash or
reinvested in additional shares.
 
    The Trust advises its shareholders annually as to the federal income tax
status of distributions paid during each calendar year. To avoid being subject
to a 31% federal backup withholding tax on taxable dividends, capital gains
distributions and proceeds of redemptions, shareholders' taxpayer identification
numbers must be furnished and certified as to accuracy.
 
    Shareholders are urged to consult their own tax advisers regarding specific
questions as to federal, state or local taxes.
 
CURRENT AND EFFECTIVE YIELD
 
    From time to time the Trust 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 Trust refers to the income
generated by an investment in the Trust over a given period (which period will
be stated in the advertisement). This income is then "annualized." That is, the
amount of income generated by investment during that seven-day period is assumed
to be generated each seven-day period within a 365 day period and is shown as a
percentage of investment. The "effective yield" for a seven-day period is
calculated similarly but, when annualized, the income earned by an investment in
the Trust is assumed to be reinvested each week within
 
                                       15
<PAGE>
   
a 365 day period. The "effective yield" will be slightly higher than the "yield"
because of the compounding effect of this assumed reinvestment. The Trust's
yield for the seven days ended January 31, 1998 was 4.86%. The effective annual
yield on 4.86% is 4.98%, assuming daily compounding. The Trust may also
advertise the growth of hypothetical investments of $10,000, $50,000 and
$100,000 in shares of the Trust.
    
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
    VOTING RIGHTS.  All shares of beneficial interest of the Trust are of $0.01
par value and are equal as to earnings, assets and voting privileges.
 
    The Trust is not required to hold Annual Meetings of Shareholders and, in
ordinary circumstances, the Trust does not intend to hold such meetings. The
Trustees may call Special Meetings of Shareholders for action by shareholder
vote as may be required by the Act or the Declaration of Trust. Under certain
circumstances, the Trustees may be removed by action of the Trustees or by the
shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for the obligations of the
Trust. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Trust, requires that notice
of such disclaimer be given in each instrument entered into or executed by the
Trust and provides for indemnification and reimbursement of expenses out of the
Trust's property for any shareholder held personally liable for the obligations
of the Trust. Thus, the risk of a shareholder incurring financial loss on
account of shareholder liability is limited to circumstances in which the Trust
itself would be unable to meet its obligations. Given the above limitations on
shareholder personal liability and the nature of the Trust's assets and
operations, the possibility of the Trust being unable to meet its obligations is
remote and, in the opinion of Massachusetts counsel to the Trust, the risk to
Trust shareholders of personal liability is remote.
 
    CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean
Witter Services Company Inc. and the Distributor are subject to a strict Code of
Ethics adopted by those companies. The Code of Ethics is intended to ensure that
the interests of shareholders and other clients are placed ahead of any personal
interest, that no undue personal benefit is obtained from a person's employment
activities and that actual and potential conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an advance clearance process to monitor that no
Dean Witter Fund is engaged at the same time in a purchase or sale of the same
security. The Code of Ethics bans the purchase of securities in an initial
public offering, and also prohibits engaging in futures and options transactions
and profiting on short-term trading (that is, a purchase within sixty days of a
sale or a sale within sixty days of a purchase) of a security. In addition,
investment personnel may not purchase or sell a security for their personal
account within thirty days before or after any transaction in any Dean Witter
Fund managed by them. Any violations of the Code of Ethics are subject to
sanctions, including reprimand, demotion or suspension or termination of
employment. The Code of Ethics comports with regulatory requirements and the
recommendations in the 1994 report by the Investment Company Institute Advisory
Group on Personal Investing.
 
   
    MASTER/FEEDER CONVERSION.  The Trust reserves the right to seek to achieve
its investment objectives by investing all of its investable assets in a
diversified, open-end management investment company having the same investment
objectives and policies and substantially the same investment restrictions as
those applicable to the Trust.
    
 
                                       16
<PAGE>
   
    YEAR 2000.  The investment management services provided to the Trust by the
Investment Manager and the services provided to shareholders by the Distributor
and the Transfer Agent depend on the smooth functioning of their computer
systems. Many computer software systems in use today cannot recognize the year
2000, but revert to 1900 or some other date, due to the manner in which dates
were encoded and calculated. That failure could have a negative impact on the
handling of securities trades, pricing and account services. The Investment
Manager, the Distributor and the Transfer Agent have been actively working on
necessary changes to their own computer systems to prepare for the year 2000 and
expect that their systems will be adapted before that date, but there can be no
assurance that they will be successful, or that interaction with other
non-complying computer systems will not impair their services at that time.
    
 
    SHAREHOLDER INQUIRIES.  All inquiries regarding the Trust should be directed
to the Trust, the Distributor or the Transfer Agent at one of the telephone
numbers or at the address set forth on the front cover of this Prospectus.
 
                                       17
<PAGE>
 
  2  3  0 --
 for office use only
 
                                                                  [LOGO]
APPLICATION
 
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
   
Send to: Dean Witter Trust FSB (the "Transfer Agent"), P.O. Box 1040, Jersey
City, NJ 07303
    
 
   
<TABLE>
<S>             <C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C>
INSTRUCTIONS    For assistance in completing this application, telephone Dean Witter Trust FSB at (800) 869-NEWS (toll-free).
TO REGISTER
SHARES          1.[REMOVE APPLICATION CAREFULLY]
(please print)
                ---------------------------------------------------------------------------------------------------------------
                                  First Name                                    Last Name
- -As joint
  tenants,
  use line 1 & 2  2.
                ---------------------------------------------------------------------------------------------------------------
                                  First Name                                    Last Name
                   (Joint tenants with rights of survivorship unless otherwise
                   specified)
                                                                                              ------------------------
</TABLE>
    
<TABLE>
<S>             <C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C><C>
                                                                                              Social Security Number
- -As custodian
  for a minor,   3.
  use lines 1 &
  3
                ---------------------------------------------------------------------------------------------------------------
                                                                    Minor's Name
                   Under the________Uniform Gifts to Minors Act                            ---------------------------
                                                                                           Minor's Social Security Number
                   State of Residence of Minor
- -In the name of a
  corporation,   4.
  trust,
  partnership
  or other      ---------------------------------------------------------------------------------------------------------------
                                    Name of Corporation, Trust (including trustee name(s)) or Other Organization
  institutional
  investors, use
  line 4
                   If Trust, Date of Trust Instrument:____________                          Tax Identification
                                                                                             Number__________
ADDRESS
                ---------------------------------------------------------------------------------------------------------------
                   City                       State                       Zip Code
</TABLE>
 
<TABLE>
<S>               <C>                                                                                                            <C>
TO PURCHASE
SHARES:
Minimum Initial   / / CHECK (enclosed) $__________ (Make Payable to Dean Witter U.S. Government Money Market Trust)
Investment:
$1,000            / / WIRE*  On__________          MF*________
                  (Date)                            (Control number, this transaction)
</TABLE>
 
   
<TABLE>
<S>               <C>                                                                                                         <C>
                  ----------------------------------------------------------------------------------------------------------
                  Name of Bank                                                                        Branch
                  ----------------------------------------------------------------------------------------------------------
                  Address
                  ----------------------------------------------------------------------------------------------------------
                  Telephone Number
                  * For an initial investment made by wiring funds, obtain a control number by calling: (800) 869-NEWS
                  (toll-free).
                   Your bank should wire to:
                  Bank of New York for credit to account of Dean Witter Trust FSB
</TABLE>
    
 
<TABLE>
<S>               <C>                                                                                                         <C>
                  Account Number: 8900188413
                  Re: Dean Witter U.S. Government Money Market Trust
                  Account Of:______________________
                  (Investor's Account as Registered at the Transfer Agent)
                  Control or Account Number:______________________
                  (Assigned by Telephone)
                                                         OPTIONAL SERVICES
</TABLE>
 
<TABLE>
<S>               <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>
                  NOTE: If you are a current shareholder of Dean Witter U.S.
                  Government Money Market Trust, please indicate your fund account
                  number here.
                  [ 2 ] [ 3 ] [ 0 ]  -
</TABLE>
 
<TABLE>
<S>               <C>
DIVIDENDS         All dividends will be reinvested daily in additional shares, unless the following option is selected:
                  / / Pay income dividends by check at the end of each month.
WRITE YOUR OWN    / / Send an initial supply of checks.
CHECK             FOR JOINT ACCOUNTS:
                  / / CHECK THIS BOX IF ALL OWNERS ARE REQUIRED TO SIGN CHECKS.
SYSTEMATIC        / / Systematic Withdrawal Plan ($25 minimum)                                        / / Percentage of balance
WITHDRAWAL        (annualized basis)
PLAN              $________ / / Monthly or / / Quarterly                                     ______% / / Monthly or / / Quarterly
Minimum           / / 10th   or / / 25th of Month/Quarter                                     / / 10th    or / / 25th of
Account Value:    Month/Quarter
$5,000            / / Pay shareholder(s) at address of record.
                  / / Pay to the following: (If this payment option is selected a signature guarantee is required)
</TABLE>
 
<TABLE>
<S>               <C>                                                                                                         <C>
                  ----------------------------------------------------------------------------------------------------------
                  Name
                  ----------------------------------------------------------------------------------------------------------
                  Address
                  ----------------------------------------------------------------------------------------------------------
                  City                       State                       Zip Code
</TABLE>
 
<PAGE>
 
   
<TABLE>
<S>               <C>                                                                              <C>                           <C>
PAYMENT TO        / /  Dean Witter Trust FSB is hereby authorized to honor telephonic or other instructions, without signature
PREDESIGNATED        guarantee, from any person for the redemption of any or all shares of Dean Witter U.S. Government Money Market
BANK ACCOUNT           Trust held in my (our) account provided that proceeds are transmitted only to the following bank account.
                       (Absent its own negligence, neither Dean Witter U.S. Government Money Market Trust nor Dean Witter Trust FSB
                       (the "Transfer Agent") shall be liable for any redemption caused by unauthorized instruction(s)):
Bank Account must be in
same  name  as  shares  are
registered        -------------------------------------------------------------------------------  ------------------------------
                  NAME & BANK ACCOUNT NUMBER                                                        BANK'S ROUTING TRANSMIT CODE
                                                                                                          (ASK YOUR BANK)
Minimum Amount:
$1,000            NAME OF BANK
                  -------------------------------------------------------------------------------
                  ADDRESS OF BANK
                  -------------------------------------------------------------------------------
                  TELEPHONE NUMBER OF BANK
                                                              SIGNATURE AUTHORIZATION
FOR ALL ACCOUNTS  NOTE: RETAIN A COPY OF THIS DOCUMENT FOR YOUR RECORDS. ANY MODIFICATION OF THE INFORMATION BELOW WILL REQUIRE AN
                  AMENDMENT TO THIS FORM. THIS DOCUMENT IS IN FULL FORCE AND EFFECT UNTIL ANOTHER DULY EXECUTED FORM IS RECEIVED BY
                  THE TRANSFER AGENT.
                  The "Transfer Agent" is hereby authorized to act as agent for the registered owner of shares of Dean Witter U.S.
                  Government Money Market Trust (the "Fund") in effecting redemptions of shares and is authorized to recognize the
                  signature(s) below in payment of funds resulting from such redemptions on behalf of the registered owners of such
                  shares. The Transfer Agent shall be liable only for its own negligence and not for default or negligence of its
                  correspondents, or for losses in transit. The Fund shall not be liable for any default or negligence of the
                  Transfer Agent.
                  I (we) certify to my (our) legal capacity, or the capacity of the investor named above, to invest in and redeem
                  shares of, and I (we) acknowledge receipt of a current prospectus of, Dean Witter U.S. Government Money Market
                  Trust and (we) further certify my (our) authority to sign and act for and on behalf of the investor.
                  Under penalties of perjury, I certify (1) that the number shown on this form is my correct taxpayer identification
                  number and (2) that I am not subject to backup withholding either because I have not been notified that I am
                  subject to backup withholding as a result of a failure to report all interest or dividends, or the Internal
                  Revenue Service has notified me that I am no longer subject to backup withholding. (Note: You must cross out item
                  (2) above if you have been notified by IRS that you are currently subject to backup withholding because of
                  underreporting interest or dividends on your tax return.)
                  For Individual, Joint and Custodial Accounts for Minors, Check Applicable Box:
                  / / I am a United States Citizen.                     / / I am not a United States Citizen.
                                                  SIGNATURE(S) (IF JOINT TENANTS, ALL MUST SIGN)
</TABLE>
    
 
<TABLE>
<S>               <C>                                                       <C>
                  ------------------------------------------------          ------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
Name(s) must be
signed
exactly the same  SIGNED THIS_______________DAY OF__________, 19____.
as shown on
lines 1 to 4 on
the reverse
side of this                                FOR CORPORATIONS, TRUSTS, PARTNERSHIPS AND OTHER ORGANIZATIONS
application
                  The following named persons are currently officers/trustees/general partners/other authorized signatories of the
                  Registered Owner, and any * of them ("Authorized Person(s)") is/are currently authorized under the applicable
                  governing document to act with full power to sell, assign or transfer securities of the the Fund for the
                  Registered Owner and to execute and deliver any instrument necessary to effectuate the authority hereby conferred:
                                         NAME/TITLE                                                SIGNATURE
</TABLE>
 
<TABLE>
<S>               <C>                                                       <C>
In addition,
complete
Section A or B    --------------------------------------------------------  --------------------------------------------------------
below.
                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
                  SIGNED THIS____________DAY OF____________, 19____.
                  The Transfer Agent may, without inquiry, act only upon the instruction of ANY PERSON(S) purporting to be (an)
                  Authorized Person(s) as named in the Certification Form last received by the Transfer Agent. The Transfer Agent
                  and the Fund shall not be liable for any claims, expenses (including legal fees) or losses resulting from the
                  Transfer Agent having acted upon any instruction reasonably believed genuine.
                  ------------------------------------------------------------------------------------------------------------------
                  *INSERT A NUMBER. UNLESS OTHERWISE INDICATED, THE TRANSFER AGENT MAY HONOR INSTRUCTIONS OF ANY ONE OF THE PERSONS
                   NAMED ABOVE.
</TABLE>
 
<TABLE>
<S>                   <C>
SECTION (A)           NOTE: EITHER A SIGNATURE GUARANTEE OR CORPORATE SEAL IS REQUIRED.
CORPORATIONS AND
INCORPORATED
ASSOCIATIONS ONLY.    I, ____________, Secretary of the Registered Owner, do hereby certify that at a meeting on
SIGN ABOVE AND COM-   ____________ at which a quorum was present throughout, the Board of Directors of the
PLETE THIS            corporation/the officers of the association duly adopted a resolution, which is in full force and
SECTION               effect and in accordance with the Registered Owner's charter and by-laws, which resolution did the
                      following: (1) empowered the above-named Authorized Person(s) to effect securities transactions
                      for the Registered Owner on the terms described above; (2) authorized the Secretary to certify,
                      from time to time, the names and titles of the officers of the Registered Owner and to notify the
                      Transfer Agent when changes in office occur; and (3) authorized the Secretary to certify that such
                      a resolution has been duly adopted and will remain in full force and effect until the Transfer
                      Agent receives a duly executed amendment to the Certification Form.
SIGNATURE
GUARANTEE**           Witness my hand on behalf of the corporation/association this ______ day of ____________, 19____.
(or Corporate Seal)
                      --------------------------------------------------------------------------------------------------
                                                                 Secretary**
                      The undersigned officer (other than the Secretary) hereby certifies that the foregoing instrument
                      has been signed by the Secretary of the
                      corporation/association.
SIGNATURE
GUARANTEE**           --------------------------------------------------------------------------------------------------
(or Corporate Seal)                  Certifying Officer of the Corporation or Incorporated Association**
SECTION (B) ALL                                    NOTE: A SIGNATURE GUARANTEE IS REQUIRED.
OTHER
INSTITUTIONAL         --------------------------------------------------------------------------------------------------
INVESTORS                                                         Certifying
SIGNATURE                                          Trustee(s)/General Partner(s)/Other(s)**
GUARANTEE**
                      --------------------------------------------------------------------------------------------------
SIGN ABOVE AND COM-                                               Certifying
PLETE THIS SECTION                                 Trustee(s)/General Partner(s)/Other(s)**
                      **SIGNATURE(S) MUST BE GUARANTEED BY AN ELIBIGLE GUARANTOR
</TABLE>
 
<TABLE>
<S>               <C>                                                   <C>                                                 <C>
DEALER            Above signature(s) guaranteed. Prospectus has been delivered by undersigned to above-named applicant(s).
(if any)
Completion by
dealer only       ----------------------------------------------------  ----------------------------------------------------
                  Firm Name                                             Office Number-Account Number at Dealer-A/E Number
                  ----------------------------------------------------  ----------------------------------------------------
                  Address                                               Account Executive's Last Name
                  ----------------------------------------------------  ----------------------------------------------------
                  City, State, Zip Code                                 Branch Office
</TABLE>
 
- -Registered Trademark- 1998 Dean Witter Distributors Inc.
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
PORTFOLIO OF INVESTMENTS JANUARY 31, 1998
 
<TABLE>
<CAPTION>
                                                                                        ANNUALIZED
PRINCIPAL                                  DESCRIPTION                                    YIELD
AMOUNT IN                                      AND                                      ON DATE OF
THOUSANDS                                 MATURITY DATE                                  PURCHASE      VALUE
- ----------------------------------------------------------------------------------------------------------------
<C>        <S>                                                                          <C>         <C>
           U.S. GOVERNMENT AGENCIES (99.5%)
$ 84,310   Federal Farm Credit Bank 02/23/98-11/23/98.................................  5.41-5.69%  $ 82,951,474
 375,997   Federal Home Loan Banks 02/04/98-07/29/98..................................  5.41-5.68    373,010,677
 173,558   Federal Home Loan Mortgage Corp. 02/02/98-06/05/98.........................  5.37-5.73    172,209,277
 230,638   Federal National Mortgage Assoc. 02/05/98-07/06/98.........................  5.41-5.70    228,354,834
  10,000   Student Loan Marketing Assoc. 04/27/98.....................................       5.41      9,872,434
  20,000   Tennessee Valley Authority 02/10/98-4/21/98................................  5.40-5.55     19,866,362
                                                                                                    ------------
 
           TOTAL U.S. GOVERNMENT AGENCIES
           (AMORTIZED COST $886,265,058)..........................................................   886,265,058
                                                                                                    ------------
 
           U.S. GOVERNMENT OBLIGATION (1.1%)
  10,000   U.S. Treasury Bill 04/16/98 (AMORTIZED COST $9,891,667)....................       5.32      9,891,667
                                                                                                    ------------
 
           REPURCHASE AGREEMENT (0.3%)
   2,219   The Bank of New York due 02/02/98 (dated 01/30/98; proceeds $2,219,576) (a)
             (IDENTIFIED COST $2,218,582).............................................      5.375      2,218,582
                                                                                                    ------------
</TABLE>
 
<TABLE>
<S>                                                                                         <C>     <C>
TOTAL INVESTMENTS
(IDENTIFIED COST $898,375,307) (B)........................................................  100.9 %   898,375,307
 
LIABILITIES IN EXCESS OF CASH AND OTHER ASSETS............................................   (0.9)     (7,804,021)
                                                                                            ------  -------------
 
NET ASSETS................................................................................  100.0 % $ 890,571,286
                                                                                            ------  -------------
                                                                                            ------  -------------
</TABLE>
 
- ---------------------
 
(a)  Collateralized by $2,199,915 U.S. Treasury Note 6.75% due 05/31/99 valued
     at $2,262,954.
(b)  Cost is the same for federal income tax purposes.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       18
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
JANUARY 31, 1998
 
<TABLE>
<S>                                                                                             <C>
ASSETS:
Investments in securities, at value
  (identified cost $898,375,307)..............................................................  $898,375,307
Cash..........................................................................................        90,001
Receivable for:
    Interest..................................................................................       313,129
    Shares of beneficial interest sold........................................................       272,307
Prepaid expenses and other assets.............................................................       209,299
                                                                                                ------------
 
     TOTAL ASSETS.............................................................................   899,260,043
                                                                                                ------------
 
LIABILITIES:
Payable for:
    Shares of beneficial interest repurchased.................................................     8,176,208
    Investment management fee.................................................................       336,717
    Plan of distribution fee..................................................................        73,353
Accrued expenses and other payables...........................................................       102,479
                                                                                                ------------
 
     TOTAL LIABILITIES........................................................................     8,688,757
                                                                                                ------------
 
     NET ASSETS...............................................................................  $890,571,286
                                                                                                ------------
                                                                                                ------------
 
COMPOSITION OF NET ASSETS:
Paid-in-capital...............................................................................  $890,569,126
Accumulated undistributed net investment income...............................................         2,160
                                                                                                ------------
 
     NET ASSETS...............................................................................  $890,571,286
                                                                                                ------------
                                                                                                ------------
 
NET ASSET VALUE PER SHARE,
  890,569,126 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED OF $.01 PAR VALUE)..............         $1.00
                                                                                                ------------
                                                                                                ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       19
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED JANUARY 31, 1998
 
<TABLE>
<S>                                                                                              <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME................................................................................  $49,850,300
                                                                                                 -----------
 
EXPENSES
Investment management fee......................................................................    4,108,339
Transfer agent fees and expenses...............................................................    3,708,286
Plan of distribution fee.......................................................................      861,859
Shareholder reports and notices................................................................      188,870
Registration fees..............................................................................      143,594
Professional fees..............................................................................       49,509
Custodian fees.................................................................................       46,399
Trustees' fees and expenses....................................................................       18,193
Other..........................................................................................       15,916
                                                                                                 -----------
 
     TOTAL EXPENSES............................................................................    9,140,965
                                                                                                 -----------
 
NET INVESTMENT INCOME AND NET INCREASE.........................................................  $40,709,335
                                                                                                 -----------
                                                                                                 -----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       20
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                            FOR THE YEAR      FOR THE YEAR
                                                                               ENDED             ENDED
                                                                          JANUARY 31, 1998  JANUARY 31, 1997
- ------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>               <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income and net increase..................................  $     40,709,335  $     39,392,462
Dividends from net investment income....................................       (40,709,121)      (39,391,745)
Net increase (decrease) from transactions in shares of beneficial
  interest..............................................................       (36,513,549)       24,364,860
                                                                          ----------------  ----------------
 
     NET INCREASE (DECREASE)............................................       (36,513,335)       24,365,577
 
NET ASSETS:
Beginning of period.....................................................       927,084,621       902,719,044
                                                                          ----------------  ----------------
 
     END OF PERIOD
    (INCLUDING UNDISTRIBUTED NET INVESTMENT INCOME OF $2,160 AND $1,946,
    RESPECTIVELY).......................................................  $    890,571,286  $    927,084,621
                                                                          ----------------  ----------------
                                                                          ----------------  ----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       21
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 1998
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter U.S. Government Money Market Trust (the "Trust") is registered under
the  Investment Company Act of  1940, as amended (the  "Act"), as a diversified,
open-end management investment  company. The Trust's  investment objectives  are
security  of  principal,  high  current  income  and  liquidity.  The  Trust was
organized as a Massachusetts business trust  on November 18, 1981 and  commenced
operations on February 17, 1982.
 
The  preparation of financial  statements in accordance  with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts  and disclosures. Actual  results could differ  from
those estimates.
 
The following is a summary of significant accounting policies:
 
A.  VALUATION OF  INVESTMENTS --  Portfolio securities  are valued  at amortized
cost, which approximates market value.
 
B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on  the
trade  date (date  the order  to buy  or sell  is executed).  Realized gains and
losses on security transactions  are determined by  the identified cost  method.
Premiums  are  amortized  and  discounts  are  accreted  over  the  life  of the
respective securities.
 
C. FEDERAL INCOME  TAX STATUS --  It is the  Trust's policy to  comply with  the
requirements  of the  Internal Revenue  Code applicable  to regulated investment
companies and  to distribute  all of  its taxable  income to  its  shareholders.
Accordingly, no federal income tax provision is required.
 
D.  DIVIDENDS AND DISTRIBUTIONS  TO SHAREHOLDERS --  The Trust records dividends
and distributions as of the close of each business day.
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an  Investment Management  Agreement with  Dean Witter  InterCapital
Inc.  (the  "Investment  Manager"),  the Trust  pays  the  Investment  Manager a
management fee, accrued  daily and  payable monthly, by  applying the  following
annual  rates to the net assets of the  Trust determined as of the close of each
business day: 0.50% to the  portion of the daily  net assets not exceeding  $500
million;  0.425% to the portion  of the daily net  assets exceeding $500 million
but not exceeding $750 million;  0.375% to the portion  of the daily net  assets
exceeding  $750 million but  not exceeding $1  billion; 0.35% to  the portion of
 
                                       22
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 1998, CONTINUED
 
the daily net assets exceeding $1 billion but not exceeding $1.5 billion; 0.325%
to the portion of the daily net assets exceeding $1.5 billion but not  exceeding
$2  billion; 0.30% to the  portion of the daily  net assets exceeding $2 billion
but not exceeding $2.5 billion;  0.275% to the portion  of the daily net  assets
exceeding $2.5 billion but not exceeding $3 billion; and 0.25% to the portion of
the daily net assets exceeding $3 billion.
 
Under  the terms of  the Agreement, the Investment  Manager maintains certain of
the Trust's books and records and  furnishes, at its own expense, office  space,
facilities, equipment, clerical, bookkeeping and certain legal services and pays
the salaries of all personnel, including officers of the Trust who are employees
of  the  Investment  Manager. The  Investment  Manager  also bears  the  cost of
telephone services,  heat, light,  power  and other  utilities provided  to  the
Trust.
 
3. PLAN OF DISTRIBUTION
 
Dean   Witter  Distributors  Inc.  (the  "Distributor"),  an  affiliate  of  the
Investment Manager, is the distributor of the Trust's shares and, in  accordance
with  a Plan of Distribution (the "Plan")  pursuant to Rule 12b-1 under the Act,
finances certain expenses in connection therewith.
 
Under the  Plan,  the Distributor  bears  the  expense of  all  promotional  and
distribution related activities on behalf of the Trust, except for expenses that
the   Trustees  determine  to  reimburse,  as  described  below.  The  following
activities and services may be provided by the Distributor, Dean Witter Reynolds
Inc. ("DWR"),  an  affiliate of  the  Investment Manager  and  Distributor,  its
affiliates  and other selected  broker-dealers under the  Plan: (1) compensation
to,  and  expenses  of,   account  executives  of   DWR's  and  other   selected
broker-dealers'  account executives and other  employees, including overhead and
telephone expenses; (2)  sales incentives and  bonuses to sales  representatives
and  to marketing  personnel in connection  with promoting sales  of the Trust's
shares; (3) expenses incurred in connection with promoting sales of the  Trust's
shares;  (4)  preparing and  distributing  sales literature;  and  (5) providing
advertising and promotional activities,  including direct mail solicitation  and
television, radio, newspaper, magazine and other media advertisements.
 
The  Trust is authorized to reimburse  the Distributor for specific expenses the
Distributor incurs  or plans  to  incur in  promoting  the distribution  of  the
Trust's shares. The amount of each monthly reimbursement payment may in no event
exceed  an amount equal to a payment at  the annual rate of 0.15% of the Trust's
 
                                       23
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 1998, CONTINUED
 
average daily net assets during the month. Expenses incurred by the  Distributor
pursuant  to the  Plan in any  fiscal year will  not be reimbursed  by the Trust
through payments  accrued in  any subsequent  fiscal year.  For the  year  ended
January 31, 1998, the distribution fee was accrued at the annual rate of 0.10%.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The cost of purchases and proceeds from sales/maturities of portfolio securities
for   the   year  ended   January  31,   1998  aggregated   $12,228,704,711  and
$12,310,616,114, respectively.
 
Dean Witter Trust FSB, an affiliate  of the Investment Manager and  Distributor,
is the Trust's transfer agent.
 
The  Trust has an unfunded noncontributory defined benefit pension plan covering
all independent  Trustees of  the  Trust who  will  have served  as  independent
Trustees  for at least five years at the time of retirement. Benefits under this
plan are based on years of service  and compensation during the last five  years
of service. Aggregate pension costs for the year ended January 31, 1998 included
in  Trustees'  fees and  expenses  in the  Statement  of Operations  amounted to
$2,891. At  January 31,  1998, the  Trust had  an accrued  pension liability  of
$47,654  which is included  in accrued expenses  in the Statement  of Assets and
Liabilities.
 
5. SHARES OF BENEFICIAL INTEREST
 
Transactions in  shares of  beneficial interest,  at $1.00  per share,  were  as
follows:
 
<TABLE>
<CAPTION>
                                                                     FOR THE
                                                                      YEAR        FOR THE YEAR
                                                                      ENDED          ENDED
                                                                   JANUARY 31,    JANUARY 31,
                                                                      1998            1997
                                                                   -----------   --------------
<S>                                                                <C>           <C>
Shares sold......................................................  2,013,452,444  1,937,077,890
Shares issued in reinvestment of dividends.......................   40,560,689       39,246,217
                                                                   -----------   --------------
                                                                   2,054,013,133  1,976,324,107
Shares repurchased...............................................  (2,090,526,682) (1,951,959,247)
                                                                   -----------   --------------
Net increase (decrease)..........................................  (36,513,549)      24,364,860
                                                                   -----------   --------------
                                                                   -----------   --------------
</TABLE>
 
6. FINANCIAL HIGHLIGHTS
 
See the "Financial Highlights" table on page 4 of this prospectus.
 
                                       24
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
 
   
In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights (appearing in the "Financial
Highlights" table on page 4 of this Prospectus) present fairly, in all material
respects, the financial position of Dean Witter U.S. Government Money Market
Trust (the "Trust") at January 31, 1998, the results of its operations for the
year then ended, the changes in its net assets for each of the two years in the
period then ended and the financial highlights for each of the ten years in the
period then ended, in conformity with generally accepted accounting principles.
These financial statements and financial highlights (hereafter referred to as
"financial statements") are the responsibility of the Trust's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these financial statements in accordance
with generally accepted auditing standards which require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits, which included confirmation of securities at January
31, 1998 by correspondence with the custodian, provide a reasonable basis for
the opinion expressed above.
    
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
   
NEW YORK, NEW YORK 10036
FEBRUARY 18, 1998
    
 
                                       25
<PAGE>
                        THE DEAN WITTER FAMILY OF FUNDS
 
MONEY MARKET FUNDS                       FIXED-INCOME FUNDS
Dean Witter California Tax-Free Daily    Dean Witter Balanced Income Fund
Income Trust                             Dean Witter California Tax-Free Income
Dean Witter Liquid Asset Fund Inc.       Fund
Dean Witter New York Municipal Money     Dean Witter Convertible Securities
Market Trust                             Trust
Dean Witter Tax-Free Daily Income Trust  Dean Witter Diversified Income Trust
Dean Witter U.S. Government Money        Dean Witter Federal Securities Trust
Market Trust                             Dean Witter Global Short-Term Income
EQUITY FUNDS                             Fund Inc.
Dean Witter American Value Fund          Dean Witter Hawaii Municipal Trust
Dean Witter Balanced Growth Fund         Dean Witter High Yield Securities Inc.
Dean Witter Capital Appreciation Fund    Dean Witter Intermediate Income
Dean Witter Capital Growth Securities    Securities
Dean Witter Developing Growth            Dean Witter Intermediate Term U.S.
Securities Trust                         Treasury Trust
Dean Witter Dividend Growth Securities   Dean Witter Limited Term Municipal
Inc.                                     Trust
Dean Witter European Growth Fund Inc.    Dean Witter Multi-State Municipal
Dean Witter Financial Services Trust     Series Trust
Dean Witter Fund of Funds                Dean Witter New York Tax-Free Income
Dean Witter Global Dividend Growth       Fund
Securities                               Dean Witter Short-Term Bond Fund
Dean Witter Global Utilities Fund        Dean Witter Short-Term U.S. Treasury
Dean Witter Health Sciences Trust        Trust
Dean Witter Income Builder Fund          Dean Witter Tax-Exempt Securities Trust
Dean Witter Information Fund             Dean Witter U.S. Government Securities
Dean Witter International SmallCap Fund  Trust
Dean Witter Japan Fund                   Dean Witter World Wide Income Trust
Dean Witter Market Leader Trust          DEAN WITTER RETIREMENT SERIES
Dean Witter Mid-Cap Growth Fund          American Value Series
Dean Witter Natural Resource             Capital Growth Series
Development Securities Inc.              Dividend Growth Series
Dean Witter Pacific Growth Fund Inc.     Global Equity Series
Dean Witter Precious Metals and          Intermediate Income Securities Series
Minerals Trust                           Liquid Asset Series
Dean Witter Special Value Fund           Strategist Series
Dean Witter S&P 500 Index Fund           U.S. Government Money Market Series
Dean Witter Utilities Fund               U.S. Government Securities Series
Dean Witter Value-Added Market Series    Utilities Series
Dean Witter World Wide Investment Trust  Value-Added Market Series
Morgan Stanley Dean Witter Competitive   ACTIVE ASSETS ACCOUNT PROGRAM
Edge Fund, "BEST IDEAS" PORTFOLIO        Active Assets California Tax-Free Trust
ASSET ALLOCATION FUNDS                   Active Assets Government Securities
Dean Witter Global Asset Allocation      Trust
Fund                                     Active Assets Money Trust
Dean Witter Strategist Fund              Active Assets Tax-Free Trust
<PAGE>
Dean Witter
U. S. Government
Money Market Trust
Two World Trade Center
New York, New York 10048
 
TRUSTEES
 
   
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Wayne E. Hedien
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
    
 
OFFICERS
 
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Barry Fink
Vice President, Secretary and
General Counsel
Jonathan R. Page
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
 
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
 
   
Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
    
 
INDEPENDENT ACCOUNTANTS
 
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
 
Dean Witter InterCapital Inc.
 
DEAN WITTER
U.S. GOVERNMENT
MONEY MARKET
TRUST
 
   
                                               [LOGO]
                                                     PROSPECTUS -- MARCH 2, 1998
    
<PAGE>
STATEMENT OF ADDITIONAL INFORMATION
 
   
MARCH 2, 1998                                               DEAN WITTER
    
                                                            U.S. GOVERNMENT
                                                            MONEY MARKET
                                                            TRUST
- ----------------------------------------------------------------------
 
    Dean Witter U.S. Government Money Market Trust (the "Trust") is an open-end
diversified management investment company whose investment objectives are
security of principal, high current income and liquidity. The Trust seeks to
achieve its objectives by investing primarily in money market instruments
maturing in thirteen months or less which are issued or guaranteed by the United
States Government, its agencies or instrumentalities. (See "Investment Practices
and Policies".) Shares of the Trust are not sponsored, guaranteed, endorsed or
insured by the U.S. Government or any agency thereof.
 
    The Trust is authorized to reimburse for specific expenses incurred in
promoting the distribution of the Trust's shares pursuant to a Plan of
Distribution with Dean Witter Distributors Inc. pursuant to Rule 12b-1 under the
Investment Company Act of 1940. Reimbursement may in no event exceed an amount
equal to payments at the annual rate of 0.15% of the average daily net assets of
the Trust.
 
   
    A Prospectus for the Trust, dated March 2, 1998, which provides the basic
information you should know before investing in the Trust, may be obtained
without charge by request of the Trust at its address or at one of the telephone
numbers listed below or from the Fund's Distributor, Dean Witter Distributors
Inc., or from Dean Witter Reynolds Inc. at any of its branch offices or from any
other Selected Broker-Dealer. This Statement of Additional Information is not a
Prospectus. It contains information in addition to and more detailed than that
set forth in the Prospectus. It is intended to provide additional information
regarding the activities and operations of the Trust, and should be read in
conjunction with the Prospectus.
    
 
Dean Witter
U.S. Government Money Market Trust
Two World Trade Center
New York, New York 10048
(212) 392-2550 or (800) 869-NEWS (toll-free)
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
The Trust and its Management...........................................................          3
Trustees and Officers..................................................................          6
Investment Practices and Policies......................................................         11
Investment Restrictions................................................................         13
Portfolio Transactions and Brokerage...................................................         14
Purchase of Trust Shares...............................................................         16
Redemption of Trust Shares.............................................................         24
Dividends, Distributions and Taxes.....................................................         25
Shares of the Trust....................................................................         26
Custodian and Transfer Agent...........................................................         27
Independent Accountants................................................................         27
Reports to Shareholders................................................................         27
Legal Counsel..........................................................................         28
Experts................................................................................         28
Registration Statement.................................................................         28
Financial Statements...................................................................         28
</TABLE>
    
 
                                       2
<PAGE>
THE TRUST AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
THE TRUST
 
    The Trust is a Trust of the type commonly known as a "Massachusetts business
trust" and was organized under the laws of the Commonwealth of Massachusetts on
November 18, 1981 under the name Sears U.S. Government Money Market Trust. On
January 18, 1983 the Trustees approved a change in the Trust's name, which
became effective March 21, 1983, to Dean Witter/Sears U.S. Government Money
Market Trust. On February 19, 1993, the Trustees changed the name of the Trust
to Dean Witter U.S. Government Money Market Trust.
 
   
    As of January 31, 1998, no shareholder was known to own beneficially or of
record as much as 5% of the outstanding shares of the Trust. The percentage
ownership of the Trust changes from time to time depending on purchases and
redemptions by shareholders and the total number of shares outstanding.
    
 
THE INVESTMENT MANAGER
 
   
    Dean Witter InterCapital Inc. (the "Investment Manager" or "InterCapital"),
a Delaware corporation, whose address is Two World Trade Center, New York, New
York 10048, is the Trust's Investment Manager. InterCapital is a wholly-owned
subsidiary of Morgan Stanley, Dean Witter, Discover & Co. ("MSDWD"), a Delaware
corporation. In an internal reorganization which took place in January, 1993,
InterCapital assumed the investment advisory, administrative and management
activities previously performed by the InterCapital Division of Dean Witter
Reynolds Inc. ("DWR"), a broker-dealer affiliate of InterCapital. (As
hereinafter used in this Statement of Additional Information, the terms
"InterCapital" and "Investment Manager" refer to DWR's InterCapital Division
prior to the reorganization and to Dean Witter InterCapital Inc. thereafter.)
The daily management of the Trust and research relating to the Trust's portfolio
are conducted by or under the direction of officers of the Trust and of the
Investment Manager, subject to review by the Trust's Board of Trustees.
Information as to these Trustees and officers is contained under the caption
"Trustees and Officers."
    
 
   
    The Investment Manager is also the investment manager or investment adviser
of the following investment companies: Dean Witter Liquid Asset Fund Inc.,
InterCapital Income Securities Inc., InterCapital Insured Municipal Bond Trust,
InterCapital Insured Municipal Trust, InterCapital Insured Municipal Income
Trust, InterCapital California Insured Municipal Income Trust, InterCapital
Insured Municipal Securities, InterCapital Insured California Municipal
Securities, InterCapital Quality Municipal Investment Trust, InterCapital
Quality Municipal Income Trust, InterCapital Quality Municipal Securities,
InterCapital California Quality Municipal Securities, InterCapital New York
Quality Municipal Securities, High Income Advantage Trust, High Income Advantage
Trust II, High Income Advantage Trust III, Dean Witter Government Income Trust,
Dean Witter High Yield Securities Inc., Dean Witter Tax-Free Daily Income Trust,
Dean Witter Developing Growth Securities Trust, Dean Witter Tax-Exempt
Securities Trust, Dean Witter Natural Resource Development Securities Inc., Dean
Witter Dividend Growth Securities Inc., Dean Witter American Value Fund, Dean
Witter Select Municipal Reinvestment Fund, Dean Witter Variable Investment
Series, Dean Witter World Wide Investment Trust, Dean Witter U.S. Government
Securities Trust, Dean Witter California Tax-Free Income Fund, Dean Witter New
York Tax-Free Income Fund, Dean Witter Convertible Securities Trust, Dean Witter
Federal Securities Trust, Dean Witter Value-Added Market Series, Dean Witter
Utilities Fund, Dean Witter Strategist Fund, Dean Witter California Tax-Free
Daily Income Trust, Dean Witter World Wide Income Trust, Dean Witter
Intermediate Income Securities, Dean Witter Capital Growth Securities, Dean
Witter New York Municipal Money Market Trust, Dean Witter European Growth Fund
Inc., Dean Witter Pacific Growth Fund Inc., Dean Witter Precious Metals and
Minerals Trust, Dean Witter Global Short-Term Income Fund Inc., Dean Witter
Multi-State Municipal Series Trust, Dean Witter Short-Term U.S. Treasury Trust,
Dean Witter Diversified Income Trust, Dean Witter Health Sciences Trust, Dean
Witter Retirement Series, Dean Witter Global Dividend Growth Securities, Dean
Witter Limited Term Municipal Trust, Dean Witter Short-Term Bond Fund, Dean
Witter Global Utilities Fund, Dean Witter International SmallCap Fund, Dean
Witter Mid-Cap Growth Fund, Dean Witter Select Dimensions Investment Series,
Dean Witter Global Asset Allocation Fund, Dean Witter Balanced Growth Fund, Dean
Witter Balanced Income Fund, Dean Witter Hawaii Municipal Trust, Dean Witter
Capital Appreciation Fund, Dean Witter Information Fund, Dean Witter
Intermediate Term U.S. Treasury Trust, Dean Witter Japan Fund, Dean Witter
Income Builder Fund, Dean Witter Special
    
 
                                       3
<PAGE>
   
Value Fund, Dean Witter Financial Services Trust, Dean Witter Market Leader
Trust, Dean Witter S&P 500 Index Fund, Dean Witter Fund of Funds, Morgan Stanley
Dean Witter Competitive Edge Fund, "BEST IDEAS" PORTFOLIO, Morgan Stanley Dean
Witter Growth Fund, Active Assets Tax-Free Trust, Active Assets California
Tax-Free Trust, Active Assets Government Securities Trust, Municipal Income
Trust, Municipal Income Trust II, Municipal Income Trust III, Municipal Income
Opportunities Trust, Municipal Income Opportunities Trust II, Municipal Income
Opportunities Trust III, Municipal Premium Income Trust and Prime Income Trust.
The foregoing investment companies, together with the Trust, are collectively
referred to as the Dean Witter Funds.
    
 
   
    In addition, Dean Witter Services Company Inc. ("DWSC"), a wholly-owned
subsidiary of InterCapital, serves as manager for the following companies for
which TCW Funds Management, Inc. is the investment adviser: TCW/DW North
American Government Income Trust, TCW/DW Latin American Growth Fund, TCW/DW
Income and Growth Fund, TCW/DW Small Cap Growth Fund, TCW/DW Mid-Cap Equity
Trust, TCW/DW Global Telecom Trust, TCW/DW Total Return Trust, TCW/DW Emerging
Markets Opportunities Trust, TCW/DW Term Trust 2000, TCW/DW Term Trust 2002 and
TCW/DW Term Trust 2003 (the "TCW/DW Funds"). InterCapital also serves as: (i)
administrator of The BlackRock Strategic Term Trust Inc., a closed-end
investment company; (ii) sub-administrator of MassMutual Participation Investors
and Templeton Global Governments Income Trust, closed-end investment companies;
and (iii) investment adviser of Offshore Dividend Growth Fund and Offshore Money
Market Fund, mutual funds established under the laws of the Cayman Islands and
available only to investors who are participants in DWR's International Active
Assets Account program and are neither citizens nor residents of the United
States.
    
 
    Pursuant to an Investment Management Agreement (the "Agreement") with the
Investment Manager, the Trust has retained the Investment Manager to manage the
investment of the Trust's assets, including the placing of orders for the
purchase and sale of portfolio securities. The Investment Manager obtains and
evaluates such information and advice relating to the economy, securities
markets and specific securities as it considers necessary or useful to
continuously manage the assets of the Trust in a manner consistent with its
investment objectives and policies.
 
    Under the terms of the Agreement, in addition to managing the Trust's
investments, the Investment Manager maintains certain of the Trust's books and
records and furnishes, at its expense, such office space, facilities, equipment,
clerical help, bookkeeping and certain legal services as the Trust may
reasonably require in the conduct of its business, including the services of
personnel in connection with the pricing of the Trust's shares and the
preparation of prospectuses, proxy statements and reports required to be filed
with federal and state securities commissions (except insofar as the
participation or assistance of independent accountants and attorneys is, in the
opinion of the Investment Manager, necessary or desirable). In addition, the
Investment Manager pays the salaries of all personnel, including officers of the
Trust, who are employees of the Investment Manager. The Investment Manager also
bears the cost of telephone service, heat, light, power and other utilities
provided to the Trust.
 
    Effective December 31, 1993, pursuant to a Services Agreement between
InterCapital and DWSC, DWSC began to provide the administrative services to the
Trust which were previously performed directly by InterCapital. On April 17,
1995, DWSC was reorganized in the State of Delaware, necessitating the entry
into a new Services Agreement by InterCapital and DWSC on that date. The
foregoing internal reorganizations did not result in any change in the nature or
scope of the administrative services being provided to the Trust or any of the
fees being paid by the Trust for the overall services being performed under the
terms of the existing Management Agreement.
 
   
    Expenses not expressly assumed by the Investment Manager under the Agreement
or by the Distributor of the Trust's shares, Dean Witter Distributors Inc.
("Distributors" or the "Distributor"), (see "Purchase of Trust Shares") will be
paid by the Trust. Such expenses include, but are not limited to: the
distribution fee under the Plan of Distribution pursuant to Rule 12b-1 (see
"Purchase of Trust Shares"), charges and expenses of any registrar, custodian,
stock transfer and dividend disbursing agent; brokerage commissions; taxes;
engraving and printing certificates representing shares of the Trust;
registration costs of the Trust and its shares under federal and state
securities laws; the cost and expense of printing, including typesetting, and
distributing prospectuses of the Trust and supplements thereto to the Trust's
    
 
                                       4
<PAGE>
shareholders; all expenses of shareholders' and Trustees' meetings and of
printing, including typesetting, and mailing of proxy statements and reports to
shareholders; fees and travel expenses of Trustees or members of any advisory
board or committee who are not employees of the Investment Manager or any
corporate affiliate of the Investment Manager; all expenses incident to any
dividend, distribution, withdrawal or redemption options; fees and expenses of
legal counsel, including counsel to the Trustees who are not interested persons
of the Trust or of the Investment Manager (not including compensation or
expenses of attorneys who are employees of the Investment Manager) and
independent accountants; membership dues of industry associations; interest on
Trust borrowings; postage; insurance premiums on property or personnel
(including officers and Trustees) of the Trust which inure to its benefit;
extraordinary expenses (including, but not limited to, legal claims and
liabilities and litigation costs and any indemnification relating thereto); and
all other costs of the Trust's operation.
 
   
    As full compensation for the services and facilities furnished to the Trust
and expenses of the Trust assumed by the Investment Manager, the Trust pays the
Investment Manager monthly compensation calculated daily by applying the
following annual rates to the net assets of the Trust determined as of the close
of each business day: 0.50% of the portion of the daily net assets not exceeding
$500 million; 0.425% of the portion of the daily net assets exceeding $500
million but not exceeding $750 million; 0.375% of the portion of the daily net
assets exceeding $750 million but not exceeding $1 billion; 0.35% of the portion
of the daily net assets exceeding $1 billion but not exceeding $1.5 billion;
0.325% of the portion of the daily net assets exceeding $1.5 billion but not
exceeding $2 billion; 0.30% of the portion of the daily net assets exceeding $2
billion but not exceeding $2.5 billion; 0.275% of the portion of the daily net
assets exceeding $2.5 billion but not exceeding $3 billion; and 0.25% of the
portion of the daily net assets exceeding $3 billion. For the fiscal years ended
January 31, 1996, 1997 and 1998, the Trust accrued to the Investment Manager
total compensation of $4,061,755, $4,190,754 and $4,108,339, respectively.
    
 
    The Agreement provides that in the absence of willful misfeasance, bad
faith, gross negligence or reckless disregard of its obligations thereunder, the
Investment Manager is not liable to the Trust or any of its investors for any
act or omission by the Investment Manager or for any losses sustained by the
Trust or its investors. The Agreement in no way restricts the Investment Manager
from acting as investment manager or adviser to others.
 
   
    The Agreement was initially approved by the Trustees on February 21, 1997
and by the shareholders of the Trust at a Meeting of Shareholders held on May
21, 1997. The Agreement is substantially identical to a prior investment
management agreement which was initially approved by the Trustees on October 30,
1992 and by the shareholders of the Trust at a Meeting of Shareholders held on
January 12, 1993. The Agreement took effect on May 31, 1997 upon the
consummation of the merger of Dean Witter, Discover & Co. with Morgan Stanley
Group Inc. The Agreement may be terminated at any time, without penalty, on
thirty days' notice by the Board of Trustees of the Trust, by the holders of a
majority, as defined in the Investment Company Act of 1940, as amended (the
"Act"), of the outstanding shares of the Trust, or by the Investment Manager.
The Agreement will automatically terminate in the event of its assignment (as
defined in the Act).
    
 
   
    Under its terms, the Agreement has an initial term ending April 30, 1999 and
will continue in effect from year to year thereafter, provided continuance of
the Agreement is approved at least annually by the vote of the holders of a
majority, as defined in the Act, of the outstanding shares of the Trust, or by
the Board of Trustees of the Trust; provided that in either event such
continuance is approved annually by the vote of a majority of the Trustees of
the Trust who are not parties to the Agreement or "interested persons" (as
defined in the Act) of any such party (the "Independent Trustees"), which vote
must be cast in person at a meeting called for the purpose of voting on such
approval.
    
 
    The Trust has acknowledged that the name "Dean Witter" is a property right
of DWR. The Trust has agreed that DWR or its parent company may use or, at any
time, permit others to use, the name "Dean Witter." The Trust has also agreed
that in the event the Agreement is terminated, or if the affiliation between
Dean Witter and its parent company is terminated, the Trust will eliminate the
name "Dean Witter" from its name if DWR or its parent company shall so request.
 
                                       5
<PAGE>
TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------
 
   
    The Trustees and Executive Officers of the Trust, their principal business
occupations during the last five years and their affiliations, if any, with
InterCapital and with the 85 Dean Witter Funds and the 11 TCW/DW Funds are shown
below.
    
 
   
<TABLE>
<CAPTION>
NAME, AGE, POSITION WITH TRUST AND ADDRESS              PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------  ---------------------------------------------------------------------
<S>                                         <C>
Michael Bozic (57)                          Chairman and Chief Executive Officer of Levitz Furniture Corporation
Trustee                                     (since November, 1995); Director or Trustee of the Dean Witter Funds;
c/o Levitz Furniture Corporation            formerly President and Chief Executive Officer of Hills Department
6111 Broken Sound Parkway, N.W.             Stores (May, 1991-July, 1995); formerly variously Chairman, Chief
Boca Raton, Florida                         Executive Officer, President and Chief Operating Officer (1987-1991)
                                            of the Sears Merchandise Group of Sears, Roebuck and Co.; Director of
                                            Eaglemark Financial Services, Inc., the United Negro College Fund and
                                            Weirton Steel Corporation.
 
Charles A. Fiumefreddo* (64)                Chairman, Chief Executive Officer and Director of InterCapital,
Chairman of the Board,                      Distributors and DWSC; Executive Vice President and Director of DWR;
President, Chief Executive                  Chairman, Director or Trustee, President and Chief Executive Officer
Officer and Trustee                         of the Dean Witter Funds; Chairman, Chief Executive Officer and
Two World Trade Center                      Trustee of the TCW/DW Funds; Chairman and Director of Dean Witter
New York, New York                          Trust FSB ("DWT"); Director and/or officer of various MSDWD
                                            subsidiaries.
 
Edwin J. Garn (65)                          Director or Trustee of the Dean Witter Funds; formerly United States
Trustee                                     Senator (R-Utah) (1974-1992) and Chairman, Senate Banking Committee
c/o Huntsman Corporation                    (1980-1986); formerly Mayor of Salt Lake City, Utah (1971-1974);
500 Huntsman Way                            formerly Astronaut, Space Shuttle Discovery (April 12-19, 1985); Vice
Salt Lake City, Utah                        Chairman, Huntsman Corporation; Director of Franklin Covey (time
                                            management systems), John Alden Financial Corp. (health insurance),
                                            United Space Alliance (joint venture between Lockheed Martin and the
                                            Boeing Company) and Nuskin Asia Pacific (multilevel marketing);
                                            member of the board of various civic and charitable organizations.
 
John R. Haire (73)                          Chairman of the Audit Commitee and Chairman of the Committee of the
Trustee                                     Independent Directors or Trustees and Director or Trustee of the Dean
Two World Trade Center                      Witter Funds; Chairman of the Audit Committee and Chairman of the
New York, New York                          Committee of the Independent Trustees and Trustee of the TCW/DW
                                            Funds; formerly President, Council for Aid to Education (1978-1989)
                                            and Chairman and Chief Executive Officer of Anchor Corporation, an
                                            Investment Adviser (1964-1978).
</TABLE>
    
 
                                       6
<PAGE>
   
<TABLE>
<CAPTION>
NAME, AGE, POSITION WITH TRUST AND ADDRESS              PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------  ---------------------------------------------------------------------
<S>                                         <C>
Wayne E. Hedien (64)                        Retired; Director or Trustee of the Dean Witter Funds; Director of
Trustee                                     the PMI Group, Inc. (private mortgage insurance); Trustee and Vice
c/o Gordon Altman Butowsky                  Chairman of The Field Museum of Natural History; formerly associated
 Weitzen Shalov & Wein                      with the Allstate Companies (1966-1994), most recently as Chairman of
Counsel to the Independent Trustees         The Allstate Corporation (March, 1993-December, 1994) and Chairman
114 West 47th Street                        and Chief Executive Officer of its wholly-owned subsidiary, Allstate
New York, New York                          Insurance Company (July, 1989-December, 1994); director of various
                                            other business and charitable organizations.
 
Dr. Manuel H. Johnson (49)                  Senior Partner, Johnson Smick International, Inc., a consulting firm;
Trustee                                     Co-Chairman and a founder of the Group of Seven Council (G7C), an
c/o Johnson Smick International, Inc.       international economic commission; Director or Trustee of the Dean
1133 Connecticut Avenue, N.W.               Witter Funds; Trustee of the TCW/DW Funds; Director of NASDAQ (since
Washington, DC                              June, 1995); Director of Greenwich Capital Markets, Inc.
                                            (broker-dealer); Chairman and Trustee of the Financial Accounting
                                            Foundation (oversight organization for the FASB); formerly Vice
                                            Chairman of the Board of Governors of the Federal Reserve System
                                            (1986-1990) and Assistant Secretary of the U.S. Treasury (1982-1986).
 
Michael E. Nugent (61)                      General Partner, Triumph Capital, L.P., a private investment
Trustee                                     partnership; Director or Trustee of the Dean Witter Funds; Trustee of
c/o Triumph Capital, L.P.                   the TCW/DW Funds; formerly Vice President, Bankers Trust Company and
237 Park Avenue                             BT Capital Corporation (1984-1988); Director of various business
New York, New York                          organizations.
 
Philip J. Purcell* (54)                     Chairman of the Board of Directors and Chief Executive Officer of
Trustee                                     MSDWD, DWR and Novus Credit Services Inc.; Director of InterCapital,
1585 Broadway                               DWSC and Distributors; Director or Trustee of the Dean Witter Funds;
New York, New York                          Director and/or officer of various MSDWD subsidiaries.
 
John L. Schroeder (67)                      Retired; Director or Trustee of the Dean Witter Funds; Trustee of the
Trustee                                     TCW/DW Funds; Director of Citizens Utilities Company; formerly
c/o Gordon Altman Butowsky                  Executive Vice President and Chief Investment Officer of the Home
  Weitzen Shalov & Wein                     Insurance Company (August, 1991-September 1995).
Counsel to the Independent Trustees
114 West 47th Street
New York, New York
 
Barry Fink (43)                             Senior Vice President (since March, 1997) and Secretary and General
Vice President, Secretary and               Counsel (since February, 1997) of InterCapital and DWSC; Senior Vice
General Counsel                             President (since March, 1997) and Assistant Secretary and Assistant
Two World Trade Center                      General Counsel (since February, 1997) of Distributors; Assistant
New York, New York                          Secretary of DWR (since August, 1996); Vice President, Secretary and
                                            General Counsel of the Dean Witter Funds and the TCW/DW Funds (since
                                            February, 1997); previously First Vice President (June,
                                            1993-February, 1997), Vice President (until June, 1993) and Assistant
                                            Secretary and Assistant General Counsel of InterCapital and DWSC and
                                            Assistant Secretary of the Dean Witter Funds and TCW/DW Funds.
</TABLE>
    
 
                                       7
<PAGE>
   
<TABLE>
<CAPTION>
NAME, AGE, POSITION WITH TRUST AND ADDRESS              PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------  ---------------------------------------------------------------------
<S>                                         <C>
Jonathan R. Page (51)                       Senior Vice President of InterCapital; Vice President of various Dean
Vice President                              Witter Funds.
Two World Trade Center
New York, New York
 
Thomas F. Caloia (52)                       First Vice President and Assistant Treasurer of InterCapital and
Treasurer                                   DWSC; Treasurer of the Dean Witter Funds and the TCW/DW Funds.
Two World Trade Center
New York, New York
</TABLE>
    
 
- ---------
 *Denotes Trustees who are "interested persons" of the Trust, as defined in the
  Investment Company Act of 1940, as amended.
 
   
    In addition, Robert M. Scanlan, President and Chief Operating Officer of
InterCapital and DWSC, Executive Vice President of Distributors and DWT and
Director of DWT, Mitchell M. Merin, President and Chief Strategic Officer of
InterCapital and DWSC, Executive Vice President of Distributors and DWT, and
Director of DWT, Executive Vice President, Chief Administrative Officer and
Director of DWR, and Director of SPS Transaction Services, Inc. and various
other MSDWD subsidiaries, Joseph J. McAlinden, Executive Vice President and
Chief Investment Officer of InterCapital and Director of DWT, Robert S.
Giambrone, Senior Vice President of InterCapital, DWSC, Distributors and DWT and
Director of DWT, and Peter M. Avelar, Paul D. Vance and James F. Willison,
Senior Vice Presidents of InterCapital, are Vice Presidents of the Trust and
Marilyn K. Cranney, First Vice President and Assistant General Counsel of
InterCapital and DWSC, LouAnne D. McInnis, Carsten Otto and Ruth Rossi, Vice
Presidents and Assistant General Counsels of InterCapital and DWSC, and Frank
Bruttomesso and Todd Lebo, staff attorneys with InterCapital, are Assistant
Secretaries of the Trust.
    
 
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
 
   
    The Board of Trustees consists of nine (9) trustees. These same individuals
also serve as directors or trustees for all of the Dean Witter Funds, and are
referred to in this section as Trustees. As of the date of this Statement of
Additional Information, there are a total of 85 Dean Witter Funds, comprised of
129 portfolios. As of January 31, 1998, the Dean Witter Funds had total net
assets of approximately $96 billion and more than five million shareholders.
    
 
   
    Seven Trustees (77% of the total number) have no affiliation or business
connection with InterCapital or any of its affiliated persons and do not own any
stock or other securities issued by InterCapital's parent company, MSDWD. These
are the "disinterested" or "independent" Trustees. The other two Trustees (the
"management Trustees") are affiliated with InterCapital. Four of the seven
independent Trustees are also Independent Trustees of the TCW/DW Funds.
    
 
    Law and regulation establish both general guidelines and specific duties for
the Independent Trustees. The Dean Witter Funds seek as Independent Trustees
individuals of distinction and experience in business and finance, government
service or academia; these are people whose advice and counsel are in demand by
others and for whom there is often competition. To accept a position on the
Funds' Boards, such individuals may reject other attractive assignments because
the Funds make substantial demands on their time. Indeed, by serving on the
Funds' Boards, certain Trustees who would otherwise be qualified and in demand
to serve on bank boards would be prohibited by law from doing so.
 
   
    All of the Independent Trustees serve as members of the Audit Committee and
the Committee of the Independent Trustees. Three of them also serve as members
of the Derivatives Committee. During the calendar year ended December 31, 1997,
the three Committees held a combined total of seventeen meetings. The Committees
hold some meetings at InterCapital's offices and some outside InterCapital.
Management Trustees or officers do not attend these meetings unless they are
invited for purposes of furnishing information or making a report.
    
 
                                       8
<PAGE>
    The Committee of the Independent Trustees is charged with recommending to
the full Board approval of management, advisory and administration contracts,
Rule 12b-1 plans and distribution and underwriting agreements; continually
reviewing Fund performance; checking on the pricing of portfolio securities,
brokerage commissions, transfer agent costs and performance, and trading among
Funds in the same complex; and approving fidelity bond and related insurance
coverage and allocations, as well as other matters that arise from time to time.
The Independent Trustees are required to select and nominate individuals to fill
any Independent Trustee vacancy on the Board of any Fund that has a Rule 12b-1
plan of distribution. Most of the Dean Witter Funds have such a plan.
 
    The Audit Committee is charged with recommending to the full Board the
engagement or discharge of the Fund's independent accountants; directing
investigations into matters within the scope of the independent accountants'
duties, including the power to retain outside specialists; reviewing with the
independent accountants the audit plan and results of the auditing engagement;
approving professional services provided by the independent accountants and
other accounting firms prior to the performance of such services; reviewing the
independence of the independent accountants; considering the range of audit and
non-audit fees; reviewing the adequacy of the Fund's system of internal
controls; and preparing and submitting Committee meeting minutes to the full
Board.
 
    Finally, the Board of each Fund has formed a Derivatives Committee to
establish parameters for and oversee the activities of the Fund with respect to
derivative investments, if any, made by the Fund.
 
DUTIES OF CHAIRMAN OF COMMITTEE OF THE INDEPENDENT TRUSTEES AND AUDIT COMMITTEE
 
    The Chairman of the Committee of the Independent Trustees and the Audit
Committee maintains an office at the Funds' headquarters in New York. He is
responsible for keeping abreast of regulatory and industry developments and the
Funds' operations and management. He screens and/or prepares written materials
and identifies critical issues for the Independent Trustees to consider,
develops agendas for Committee meetings, determines the type and amount of
information that the Committees will need to form a judgment on various issues,
and arranges to have that information furnished to Committee members. He also
arranges for the services of independent experts and consults with them in
advance of meetings to help refine reports and to focus on critical issues.
Members of the Committees believe that the person who serves as Chairman of both
Committees and guides their efforts is pivotal to the effective functioning of
the Committees.
 
    The Chairman of the Committees also maintains continuous contact with the
Funds' management, with independent counsel to the Independent Trustees and with
the Funds' independent auditors. He arranges for a series of special meetings
involving the annual review of investment advisory, management and other
operating contracts of the Funds and, on behalf of the Committees, conducts
negotiations with the Investment Manager and other service providers. In effect,
the Chairman of the Committees serves as a combination of chief executive and
support staff of the Independent Trustees.
 
   
    The Chairman of the Committee of the Independent Trustees and the Audit
Committee is not employed by any other organization and devotes his time
primarily to the services he performs as Committee Chairman and Independent
Trustee of the Dean Witter Funds and as an Independent Trustee and as Chairman
of the Committee of the Independent Trustees and the Audit Committee of the
TCW/DW Funds. The current Committee Chairman has had more than 35 years
experience as a senior executive in the investment company industry.
    
 
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL DEAN
WITTER FUNDS
 
    The Independent Trustees and the Funds' management believe that having the
same Independent Trustees for each of the Dean Witter Funds avoids the
duplication of effort that would arise from having different groups of
individuals serving as Independent Trustees for each of the Funds or even of
sub-groups of Funds. They believe that having the same individuals serve as
Independent Trustees of all the Funds tends to increase their knowledge and
expertise regarding matters which affect the Fund complex generally and enhances
their ability to negotiate on behalf of each Fund with the Fund's service
providers. This arrangement also precludes the possibility of separate groups of
Independent Trustees
 
                                       9
<PAGE>
arriving at conflicting decisions regarding operations and management of the
Funds and avoids the cost and confusion that would likely ensue. Finally, having
the same Independent Trustees serve on all Fund Boards enhances the ability of
each Fund to obtain, at modest cost to each separate Fund, the services of
Independent Trustees, and a Chairman of their Committees, of the caliber,
experience and business acumen of the individuals who serve as Independent
Trustees of the Dean Witter Funds.
 
COMPENSATION OF INDEPENDENT TRUSTEES
 
   
    The Trust pays each Independent Trustee an annual fee of $800 plus a per
meeting fee of $50 for meetings of the Board of Trustees or committees of the
Board of Trustees attended by the Trustee (the Trust pays the Chairman of the
Audit Committee an annual fee of $750 and pays the Chairman of the Committee of
the Independent Trustees an additional annual fee of $1,200). If a Board meeting
and a Committee meeting, or more than one Committee meeting, take place on a
single day, the Trustees are paid a single meeting fee by the Trust. The Trust
also reimburses such Trustees for travel and other out-of-pocket expenses
incurred by them in connection with attending such meetings. Trustees and
officers of the Trust who are or have been employed by the Investment Manager or
an affiliated company receive no compensation or expense reimbursement from the
Trust.
    
 
   
    The following table illustrates the compensation paid to the Trust's
Independent Trustees by the Trust for the fiscal year ended January 31, 1998.
    
 
                               TRUST COMPENSATION
 
   
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                     FROM THE TRUST
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,600
Edwin J. Garn.................................................       1,800
John R. Haire.................................................       3,750
Wayne E. Hedien...............................................         782
Dr. Manuel H. Johnson.........................................       1,750
Michael E. Nugent.............................................       1,800
John L. Schroeder.............................................       1,800
</TABLE>
    
 
   
    The following table illustrates the compensation paid to the Trust's
Independent Trustees for the calendar year ended December 31, 1997 for services
to the 84 Dean Witter Funds and, in the case of Messrs. Haire, Johnson, Nugent
and Schroeder, the 14 TCW/DW Funds that were in operation at December 31, 1997.
With respect to Messrs. Haire, Johnson, Nugent and Schroeder, the TCW/DW Funds
are included solely because of a limited exchange privilege between those Funds
and five Dean Witter Money Market Funds. Mr. Hedien's term as Director or
Trustee of each Dean Witter Fund commenced on September 1, 1997.
    
 
   
           CASH COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS
    
 
   
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS    FOR SERVICE
                                                                    CHAIRMAN OF          AS          TOTAL CASH
                                                                   COMMITTEES OF     CHAIRMAN OF    COMPENSATION
                               FOR SERVICE                          INDEPENDENT     COMMITTEES OF   FOR SERVICES
                              AS DIRECTOR OR                         DIRECTORS/      INDEPENDENT         TO
                               TRUSTEE AND       FOR SERVICE AS     TRUSTEES AND    TRUSTEES AND       84 DEAN
                             COMMITTEE MEMBER     TRUSTEE AND          AUDIT            AUDIT          WITTER
                                OF 84 DEAN      COMMITTEE MEMBER   COMMITTEES OF    COMMITTEES OF     FUNDS AND
NAME OF                           WITTER          OF 14 TCW/DW     84 DEAN WITTER     14 TCW/DW       14 TCW/DW
INDEPENDENT TRUSTEE               FUNDS              FUNDS             FUNDS            FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
Michael Bozic..............      $133,602           --                 --               --            $133,602
<S>                          <C>                <C>                <C>              <C>             <C>
Edwin J. Garn..............       149,702           --                 --               --             149,702
John R. Haire..............       149,702           $73,725           $157,463        $ 25,350         406,240
Wayne E. Hedien............        39,010           --                 --               --              39,010
Dr. Manuel H. Johnson......       145,702            71,125            --               --             216,827
Michael E. Nugent..........       149,702            73,725            --               --             223,427
John L. Schroeder..........       149,702            73,725            --               --             223,427
</TABLE>
    
 
                                       10
<PAGE>
    As of the date of this Statement of Additional Information, 57 of the Dean
Witter Funds, including the Trust, have adopted a retirement program under which
an Independent Trustee who retires after serving for at least five years (or
such lesser period as may be determined by the Board) as an Independent Director
or Trustee of any Dean Witter Fund that has adopted the retirement program (each
such Fund referred to as an "Adopting Fund" and each such Trustee referred to as
an "Eligible Trustee") is entitled to retirement payments upon reaching the
eligible retirement age (normally, after attaining age 72). Annual payments are
based upon length of service. Currently, upon retirement, each Eligible Trustee
is entitled to receive from the Adopting Fund, commencing as of his or her
retirement date and continuing for the remainder of his or her life, an annual
retirement benefit (the "Regular Benefit") equal to 25.0% of his or her Eligible
Compensation plus 0.4166666% of such Eligible Compensation for each full month
of service as an Independent Director or Trustee of any Adopting Fund in excess
of five years up to a maximum of 50.0% after ten years of service. The foregoing
percentages may be changed by the Board.(1) "Eligible Compensation" is one-fifth
of the total compensation earned by such Eligible Trustee for service to the
Adopting Fund in the five year period prior to the date of the Eligible
Trustee's retirement. Benefits under the retirement program are not secured or
funded by the Adopting Funds.
 
   
    The following table illustrates the retirement benefits accrued to the
Trust's Independent Trustees by the Trust for the fiscal year ended January 31,
1998 and by the 57 Dean Witter Funds (including the Trust) for the year ended
December 31, 1997, and the estimated retirement benefits for the Trust's
Independent Trustees, to commence upon their retirement, from the Trust as of
January 31, 1998 and from the 57 Dean Witter Funds as of December 31, 1997.
    
 
          RETIREMENT BENEFITS FROM THE TRUST AND ALL DEAN WITTER FUNDS
 
   
<TABLE>
<CAPTION>
                                       FOR ALL ADOPTING FUNDS
                                     ---------------------------   RETIREMENT BENEFITS   ESTIMATED ANNUAL
                                      ESTIMATED                                              BENEFITS
                                       CREDITED                    ACCRUED AS EXPENSES         UPON
                                        YEARS        ESTIMATED                            RETIREMENT(2)
                                      OF SERVICE     PERCENTAGE    --------------------  ----------------
                                          AT             OF                     BY ALL    FROM   FROM ALL
                                      RETIREMENT      ELIGIBLE      BY THE      ADOPTING  THE    ADOPTING
NAME OF INDEPENDENT TRUSTEE          (MAXIMUM 10)   COMPENSATION    TRUST        FUNDS   TRUST    FUNDS
- -----------------------------------  ------------   ------------   --------     -------  ------  --------
<S>                                  <C>            <C>            <C>          <C>      <C>     <C>
Michael Bozic......................       10           50.0%       $   347      $20,499  $  825  $ 47,025
Edwin J. Garn......................       10           50.0            492       30,878     825    47,025
John R. Haire......................       10           50.0           (789 )(3) (19,823 (3)  2,260  127,897
Wayne E. Hedien                            9           42.5             52            0     701    39,971
Dr. Manuel H. Johnson..............       10           50.0            209       12,832     825    47,025
Michael E. Nugent..................       10           50.0            351       22,546     825    47,025
John L. Schroeder..................        8           41.7            667       39,350     693    39,504
</TABLE>
    
 
- ------------------------
(1) An Eligible Trustee may elect alternate payments of his or her retirement
    benefits based upon the combined life expectancy of such Eligible Trustee
    and his or her spouse on the date of such Eligible Trustee's retirement. The
    amount estimated to be payable under this method, through the remainder of
    the later of the lives of such Eligible Trustee and spouse, will be the
    actuarial equivalent of the Regular Benefit. In addition, the Eligible
    Trustee may elect that the surviving spouse's periodic payment of benefits
    will be equal to either 50% or 100% of the previous periodic amount, an
    election that, respectively, increases or decreases the previous periodic
    amount so that the resulting payments will be the actuarial equivalent of
    the Regular Benefit.
 
(2) Based on current levels of compensation. Amount of annual benefits also
    varies depending on the Trustee's elections described in Footnote (1) above.
 
   
(3) This number reflects the effect of the extension of Mr. Haire's term as
    Director or Trustee until June 1, 1998.
    
 
    As of the date of this Statement of Additional Information, the aggregate
number of shares of beneficial interest of the Trust owned by the Trust's
officers and Trustees as a group was less than 1 percent of the Trust's shares
of beneficial interest outstanding.
 
INVESTMENT PRACTICES AND POLICIES
- --------------------------------------------------------------------------------
 
   
    REPURCHASE AGREEMENTS.  As discussed in the Prospectus, when cash may be
available to the Trust for only a few days, it may be invested by the Trust in
repurchase agreements until such time as it
    
 
                                       11
<PAGE>
   
may otherwise be invested or used for payments of obligations of the Trust.
These agreements, which may be viewed as a type of secured lending by the Trust,
typically involve the acquisition by the Trust of debt securities from a selling
financial institution such as a bank, savings and loan association or broker-
dealer. The agreement provides that the Trust will sell back to the institution,
and that the institution will repurchase, the underlying security
("collateral"), which is held by the Trust's custodian bank, at a specified
price and at a fixed time in the future, usually not more than seven days from
the date of purchase. The Trust will receive interest from the institution until
the time when the repurchase is to occur. Although such date is deemed by the
Trust to be the maturity date of a repurchase agreement, the maturities of
securities subject to repurchase agreements are not subject to any limits and
may exceed thirteen months. While repurchase agreements involve certain risks
not associated with direct investments in debt securities, the Trust follows
procedures designed to minimize such risks. These procedures include effecting
repurchase transactions only with large, well-capitalized and well-established
financial institutions whose condition will be continually monitored by the
Investment Manager. In addition, the value of the collateral underlying the
repurchase agreement will always be at least equal to the resale price, which
consists of the purchase price paid to the seller of the securities plus the
accrued resale premium which is defined as the amount specified in the
repurchase agreement or the daily amortization of the difference between the
purchase price and the resale price specified in the repurchase agreement. Such
collateral will consist entirely of securities that are direct obligations of,
or that are fully guaranteed as to principal and interest by, the United States
or any agency thereof, and/or certificates of deposit, bankers' acceptances
which are eligible for acceptance by a Federal Reserve Bank, and, if the seller
is a bank, mortgage related securities (as such term is defined in section
3(a)(41) of the Securities Exchange Act of 1934) that at the time the repurchase
agreement is entered into are rated in the highest rating category by the
"Requisite NRSROs" (see "Purchase of Trust Shares-- Determination of Net Asset
Value"). Additionally, the collateral must qualify the repurchase agreement for
preferential treatment under the Federal Deposit Insurance Act of the Federal
Bankruptcy Code. In the event of a default or bankruptcy by a selling financial
institution, the Trust will seek to liquidate such collateral. However, the
exercising of the Trust's right to liquidate such collateral could involve
certain costs or delays and, to the extent that proceeds from any sale upon a
default of the obligation to repurchase were less than the repurchase price, the
Trust could suffer a loss. It is the current policy of the Trust not to invest
in repurchase agreements that do not mature within seven days if any such
investment, together with any other illiquid assets held by the Trust, amounts
to more than 10% of its total assets. The Trust's investments in repurchase
agreements may, at times, be substantial when, in the view of the Investment
Manager, liquidity or other considerations so warrant.
    
 
    REVERSE REPURCHASE AGREEMENTS.  As discussed in the Prospectus, the Trust
may also use reverse repurchase agreements as part of its investment strategy.
Reverse repurchase agreements involve sales by the Trust of portfolio assets
concurrently with an agreement by the Trust to repurchase the same assets at a
later date at a fixed price. Generally, the effect of such a transaction is that
the Trust can recover all or most of the cash invested in the portfolio
securities involved during the term of the reverse repurchase agreement, while
it will be able to keep the interest income associated with those portfolio
securities. Such transactions are only advantageous if the interest cost to the
Trust of the reverse repurchase transaction is less than the cost of obtaining
the cash otherwise. Opportunities to achieve this advantage may not always be
available, and the Trust intends to use the reverse repurchase technique only
when it will be to its advantage to do so. The Trust will establish a segregated
account with its custodian bank in which it will maintain cash or cash
equivalents or other portfolio securities equal in value to its obligations in
respect of reverse repurchase agreements. Reverse repurchase agreements are
considered borrowings by the Trust and for purposes other than meeting
redemptions may not exceed 5% of the Trust's total assets.
 
    LENDING OF PORTFOLIO SECURITIES.  Subject to investment restriction (11)
below, the Trust may lend portfolio securities to brokers, dealers and financial
institutions, provided that cash equal to at least 100% of the market value of
the securities loaned is deposited by the borrower with the Trust and is
maintained each business day in a segregated account pursuant to applicable
regulations. While such securities are on loan, the borrower will pay the Trust
any income accruing thereon, and the Trust may
 
                                       12
<PAGE>
invest the cash collateral in portfolio securities, thereby earning additional
income. The Trust will not lend its portfolio securities if such loans are not
permitted by the laws or regulations of any state in which its shares are
qualified for sale and will not lend more than 10% of the value of its total
assets. Loans would be subject to termination by the Trust on four business
days' notice, or by the borrower on one day's notice. Borrowed securities must
be returned when the loan is terminated. Any gain or loss in the market price of
the borrowed securities which occurs during the term of the loan inures to the
Trust and its shareholders. The Trust may pay reasonable finders, borrowers,
administrative, and custodial fees in connection with a loan.
 
   
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES.  As discussed in the
Prospectus, from time to time, in the ordinary course of business, the Trust may
purchase securities on a when-issued or delayed delivery basis, i.e., delivery
and payment can take place between a month and 120 days after the date of the
transaction. At the time the Trust makes the commitment to purchase securities
on a when-issued or delayed delivery basis, it will record the transaction and
thereafter reflect the value, each day, of such security in determining its net
asset value. At the time of delivery of the securities, the value may be more or
less than the purchase price. The Trust will also establish a segregated account
with its custodian bank in which it will maintain cash or cash equivalents or
other portfolio securities equal in value to commitments for such when-issued or
delayed delivery securities.
    
 
    The foregoing strategies, and those discussed in the Prospectus under the
heading "Investment Objectives and Policies," may subject the Trust to the
effects of interest rate fluctuations to a greater extent than would occur if
such strategies were not used. While these strategies may be used by the Trust
if, in the opinion of the Investment Manager, they will be advantageous to the
Trust, the Trust will be free to reduce or eliminate its activity in any of
those areas without changing its fundamental investment policies. Certain
provisions of the Internal Revenue Code, related regulations, and rulings of the
Internal Revenue Service may also have the effect of reducing the extent to
which the previously cited techniques may be used by the Trust, either
individually or in combination. Furthermore, there is no assurance that any of
these strategies or any other strategies and methods of investment available to
the Trust will result in the achievement of its objectives.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    The Trust has adopted certain investment restrictions as fundamental
policies which cannot be changed without the approval of the holders of a
"majority" of the outstanding shares of the Trust, as defined in the Act.
Majority is defined in the Act as the lesser of (a) sixty-seven percent or more
of the shares present at a meeting of shareholders, if the holders of more than
fifty percent of the outstanding shares of the Trust are present or represented
by proxy, or (b) more than fifty percent of the outstanding shares.
 
    These restrictions provide that the Trust may not:
 
        1.  Purchase common stocks, preferred stocks, warrants, other equity
    securities, corporate bonds, municipal bonds or industrial revenue bonds;
 
        2.  Borrow money, except from banks for temporary or emergency purposes,
    including the meeting of redemption requests which might otherwise require
    the untimely disposition of securities; or through its transactions in
    reverse repurchase agreements. Borrowing in the aggregate, including reverse
    repurchase agreements, may not exceed 20%, and borrowing for purposes other
    than meeting redemptions may not exceed 5% of the value of the Trust's total
    assets (including the amount borrowed), less liabilities (not including the
    amount borrowed) at the time the borrowing is made. Borrowings in excess of
    5% will be repaid before additional investments are made;
 
        3.  Pledge, hypothecate, mortgage or otherwise encumber its assets,
    except in an amount up to 10% of the value of its net assets, but only to
    secure borrowings for temporary or emergency purposes;
 
                                       13
<PAGE>
        4.  Sell securities short or purchase securities on margin;
 
        5.  Write or purchase put or call options;
 
        6.  Underwrite the securities of other issuers or purchase restricted
    securities except insofar as the Trust may enter into any repurchase or
    reverse repurchase agreements;
 
        7.  Purchase or sell real estate, real estate investment trust
    securities, commodities or commodity contracts or oil and gas interests;
 
        8.  Make loans to others except through the purchase of qualified debt
    obligations, loans of portfolio securities and entry into repurchase
    agreements referred to under "Investment Practices and Policies" above and
    "Investment Objectives and Policies" in the Prospectus;
 
        9.  Issue senior securities as defined in the Act except insofar as the
    Trust may be deemed to have issued a senior security by reason of: (a)
    entering into any repurchase or reverse repurchase agreement; (b) borrowing
    money in accordance with restrictions described above; or (c) lending
    portfolio securities;
 
        10. Invest in securities of other investment companies, except as they
    may be acquired as part of a merger, consolidation, acquisition of assets or
    plan of reorganization;
 
        11. Lend its portfolio securities in excess of 10% of its total assets.
    Any loans of portfolio securities will be made according to guidelines
    established by the Trustees, including maintenance of cash collateral of the
    borrower equal at all times to the current market value of the securities
    loaned.
 
   
    Notwithstanding any other investment policy or restriction, the Trust may
seek to achieve its investment objectives by investing all or substantially all
of its assets in another investment company having substantially the same
investment objectives and policies as the Trust.
    
 
    If a percentage restriction is adhered to at the time of an investment, a
later increase or decrease in percentage resulting from a change in values of
portfolio securities or amount of total or net assets will not constitute a
violation of any of the foregoing restrictions.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
- --------------------------------------------------------------------------------
 
    Subject to the general supervision by the Trustees of the Trust, the
Investment Manager is responsible for decisions to buy and sell securities for
the Trust, the selection of brokers and dealers to effect the transactions, and
the negotiation of brokerage commissions, if any. Purchases and sales of
portfolio securities are normally transacted through issuers, underwriters or
major dealers in U.S. Government securities acting as principals. Such
transactions are made on a net basis and do not involve payment of brokerage
commissions. The cost of securities purchased from an underwriter usually
includes a commission paid by the issuer to the underwriters; transactions with
dealers normally reflect the spread between bid and asked prices. The Trust has
never paid any brokerage commissions.
 
   
    The Investment Manager currently serves as investment manager to a number of
clients, including other investment companies, and may in the future act as
investment manager or adviser to others. It is the practice of the Investment
Manager to cause purchase and sale transactions to be allocated among the Trust
and others whose assets it manages in such manner as it deems equitable. In
making such allocations among the Trust and other client accounts, various
factors may be considered, including the respective investment objectives, the
relative size of portfolio holdings of the same or comparable securities, the
availability of cash for investment, the size of investment commitments
generally held and the opinions of the persons responsible for managing the
portfolios of the Trust and other client accounts. In the case of certain
initial and secondary public offerings, the Investment Manager may utilize a pro
rata allocation process based on the size of the Dean Witter Funds involved and
the number of shares available from the public offering.
    
 
    The policy of the Trust regarding purchases and sales of securities for its
portfolio is that primary consideration will be given to obtaining the most
favorable prices and efficient executions of transactions.
 
                                       14
<PAGE>
Consistent with this policy, when securities transactions are effected on a
stock exchange, the Trust's policy is to pay commissions which are considered
fair and reasonable without necessarily determining that the lowest possible
commissions are paid in all circumstances. The Trust believes that a requirement
always to seek the lowest possible commission cost could impede effective
portfolio management and preclude the Trust and the Investment Manager from
obtaining a high quality of brokerage and research services. In seeking to
determine the reasonableness of brokerage commissions paid in any transaction,
the Investment Manager relies upon its experience and knowledge regarding
commissions generally charged by various brokers and on its judgment in
evaluating the brokerage and research services received from the broker
effecting the transaction. Such determinations are necessarily subjective and
imprecise, as in most cases an exact dollar value for those services is not
ascertainable.
 
    In seeking to implement the Trust's policies, the Investment Manager effects
transactions with those brokers and dealers who the Investment Manager believes
provide the most favorable prices and are capable of providing efficient
executions. If the Investment Manager believes such prices and executions are
obtainable from more than one broker or dealer, it may give consideration to
placing portfolio transactions with those brokers and dealers who also furnish
research and other services to the Trust or the Investment Manager. Such
services may include, but are not limited to, any one or more of the following:
information as to the availability of securities for purchase or sale;
statistical or factual information or opinions pertaining to investment; wire
services; and appraisals or evaluations of portfolio securities.
 
    The information and services received by the Investment Manager from brokers
and dealers may be of benefit to the Investment Manager in the management of
accounts of some of its other clients and may not in all cases benefit the Trust
directly. While the receipt of such information and services is useful in
varying degrees and would generally reduce the amount of research or services
otherwise performed by the Investment Manager and thereby reduce its expenses,
it is of indeterminable value and the management fee paid to the Investment
Manager is not reduced by any amount that may be attributable to the value of
such services.
 
   
    Pursuant to an order of the Securities and Exchange Commission, the Trust
may effect principal transactions in certain money market instruments with DWR.
The Trust will limit its transactions with DWR to U.S. Government and Government
Agency Securities. Such transactions will be effected with DWR only when the
price available from DWR is better than that available from other dealers. The
Trust did not effect any such transactions with DWR during its fiscal years
ended January 31, 1996, 1997 and 1998.
    
 
   
    Consistent with the policy described above, brokerage transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through DWR, Morgan Stanley & Co. Incorporated and other brokers and
dealers that are affiliates of the Investment Manager. In order for an
affiliated broker or dealer to effect any portfolio transactions for the Trust,
the commissions, fees or other remuneration received by the affiliated broker or
dealer must be reasonable and fair compared to the commissions, fees or other
remuneration paid to other brokers in connection with comparable transactions
involving similar securities being purchased or sold on an exchange during a
comparable period of time. This standard would allow the affiliated broker or
dealer to receive no more than the remuneration which would be expected to be
received by an unaffiliated broker in a commensurate arm's length transaction.
Furthermore, the Trustees of the Trust, including a majority of the Trustees who
are not "interested" Trustees, have adopted procedures which are reasonably
designed to provide that any commissions, fees or other remuneration paid to an
affiliated broker or dealer are consistent with the foregoing standard. The
Trust has never paid any brokerage commissions to an affiliated broker or
dealer.
    
 
    Portfolio turnover rate is defined as the lesser of the value of the
securities purchased or securities sold, excluding all securities whose
maturities at time of acquisition were one year or less, divided by the average
monthly value of such securities owned during the year. Based on this
definition, it is anticipated that the Trust's policy of investing in government
securities with remaining maturities of less than one year will not result in a
quantifiable portfolio turnover rate. However, because of the short-term nature
of the Trust's portfolio securities, it is anticipated that the number of
purchases and sales or maturities of
 
                                       15
<PAGE>
such securities will be substantial. Nevertheless, as brokerage commissions are
not normally charged on purchases and sales of such securities, the large number
of these transactions does not have an adverse effect upon the net yield and net
asset value of the shares of the Trust.
 
PURCHASE OF TRUST SHARES
- --------------------------------------------------------------------------------
 
   
    As discussed in the Prospectus, the Trust offers its shares for sale to the
public on a continuous basis, without a sales charge. Pursuant to a Distribution
Agreement between the Trust and Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Investment Manager and a wholly-owned
subsidiary of MSDWD, shares of the Trust are distributed by the Distributor and
through certain selected broker-dealers who have entered into selected dealer
agreements with the Distributor ("Selected Broker-Dealers") at an offering price
equal to the net asset value per share next calculated following receipt of an
effective purchase order (accompanied by Federal Funds). Dealers in the
securities markets in which the Trust will invest usually require immediate
payment in Federal Funds. Since the payment by a Trust shareholder for his or
her other shares cannot be invested until it is converted into and available to
the Trust in Federal Funds, the Trust requires such payments to be so available
before a share purchase order can be considered effective. All checks submitted
for payment are accepted subject to collection at full face value in United
States funds and must be drawn in United States dollars on a United States bank.
    
 
   
    The Board of Trustees of the Trust, including a majority of the Trustees who
are not and were not at the time of their vote "interested persons" (as defined
in the Act) of either party to the Distribution Agreement (the "Independent
Trustees"), approved, at its meeting held on April 24, 1997, the current
Distribution Agreement appointing the Distributor as exclusive distributor of
the Trust's shares and providing for the Distributor to bear distribution
expenses not borne by the Trust. By its terms, the Distribution Agreement has an
initial term ending April 30, 1998, and will remain in effect from year to year
thereafter if approved by the Board. The current Distribution Agreement took
effect on May 31, 1997 upon the consummation of the merger of Dean Witter,
Discover & Co. with Morgan Stanley Group Inc. and is substantially identical to
the Trust's prior Distribution Agreement except for its dates of effectiveness
and termination.
    
 
   
    SHAREHOLDER INVESTMENT ACCOUNT.  Upon the purchase of shares of the Trust, a
Shareholder Investment Account is opened for the investor on the books of the
Trust, maintained by the Trust's Transfer Agent, Dean Witter Trust FSB (the
"Transfer Agent"). This is an open account in which shares owned by the investor
are credited by the Transfer Agent in lieu of issuance of a share certificate.
Whenever a shareholder-instituted transaction takes place in the Shareholder
Investment Account directly through the Transfer Agent, the shareholder will be
mailed a written confirmation of such transaction.
    
 
    DIRECT INVESTMENTS THROUGH TRANSFER AGENT.  A shareholder may make
additional investments in shares of the Trust at any time through the
Shareholder Investment Account by sending a check, payable to Dean Witter U.S.
Government Money Market Trust, in any amount not less than $50, directly to the
Transfer Agent. The shares so purchased will be credited to the Shareholder
Investment Account.
 
    ACCOUNT STATEMENTS.  All purchases of shares of the Trust will be credited
to the shareholder in a Shareholder Investment Account maintained for the
shareholder by the Transfer Agent in full and fractional shares of the Trust
(rounded to the nearest 1/100 of a share, with the exception of purchases made
through reinvestment of dividends, which are rounded to the last 1/100 of a
share). A confirmation will be mailed to the shareholder after each shareholder
instituted purchase or redemption transaction effected through the Transfer
Agent. A quarterly statement of the account is sent to all shareholders.
 
   
    The Trust and the Distributor reserve the right to reject any order for the
purchase of shares of the Trust. In addition, the offering of shares of the
Trust may be suspended at any time and resumed at any time thereafter.
    
 
                                       16
<PAGE>
EXCHANGE PRIVILEGE
 
   
    As discussed in the Prospectus under the caption "Exchange Privilege", an
Exchange Privilege exists whereby investors who have purchased shares of any of
the Dean Witter Funds that are multiple class funds ("Dean Witter Multi-Class
Funds"), shares of Dean Witter Multi-State Municipal Series Trust and Dean
Witter Hawaii Municipal Trust, which are Dean Witter Funds sold with a front-end
sales charge ("FSC Funds"), and shares of Dean Witter Global Short-Term Income
Fund Inc. ("Global Short-Term"), which is a Dean Witter Fund offered with a
contingent deferred sales charge ("CDSC"), will be permitted, after the shares
of the fund acquired by purchase (not by exchange or dividend reinvestment) have
been held for 30 days, to redeem all or part of their shares in that fund, have
the proceeds invested in shares of the Trust, Dean Witter Tax-Free Daily Income
Trust, Dean Witter Liquid Asset Fund Inc., Dean Witter California Tax-Free Daily
Income Trust and Dean Witter New York Municipal Money Market Trust (which five
funds are called "money market funds") or Dean Witter Short-Term U.S. Treasury
Trust, Dean Witter Limited Term Municipal Trust, Dean Witter Short-Term Bond
Fund and Dean Witter Intermediate Term U.S. Treasury Trust (these nine funds,
including the Trust, are collectively referred to herein as the "Exchange
Funds"). There is no waiting period for exchanges of shares acquired by exchange
or dividend reinvestment. Shares of the Exchange Funds received in an exchange
for shares of a Dean Witter Multi-Class Fund may be redeemed and exchanged only
for shares of the corresponding Class of a Dean Witter Multi-Class Fund or for
shares of one of the other Exchange Funds, provided that shares of the Exchange
Funds received in an exchange for Class A shares of a Dean Witter Multi-Class
Fund may also be redeemed and exchanged for shares of a FSC Fund, and shares of
the Exchange Funds received in an exchange for Class B shares of a Dean Witter
Multi-Class Fund may also be redeemed and exchanged for shares of Global
Short-Term. In addition, shares of the Exchange Funds received in an exchange
for shares of a FSC Fund may be redeemed and exchanged for Class A shares of a
Dean Witter Multi-Class Fund or for shares of one of the other Exchange Funds,
and shares of the Exchange Funds received in an exchange for shares of Global
Short-Term may be redeemed and exchanged for Class B shares of a Dean Witter
Multi-Class Fund or for shares of one of the other Exchange Funds. Ultimately,
any applicable CDSC will have to be paid upon redemption of shares originally
purchased from Global Short-Term or a Class of a Dean Witter Multi-Class Fund
that imposes a CDSC. An exchange will be treated for federal income tax purposes
the same as a repurchase or redemption of shares, on which the shareholder may
realize a capital gain or loss.
    
 
    Any new account established through the Exchange Privilege will have the
same registration and cash dividend or dividend reinvestment plan as the present
account, unless the Transfer Agent receives written notification to the
contrary. For telephone exchanges, the exact registration of the existing
account and the account number must be provided.
 
   
    When shares of a Dean Witter Multi-Class Fund or Global Short-Term are
exchanged for shares of the Trust or any other Exchange Funds, the exchange is
executed at no charge to the shareholder, without the imposition of the CDSC at
the time of the exchange. During the period of time the shareholder remains in
the Exchange Fund (calculated from the last day of the month in which the
Exchange Fund shares were acquired), the holding period or "year since purchase
payment made" is frozen. When shares are redeemed out of the Exchange Fund, they
will be subject to a CDSC which would be based upon the period of time the
shareholder held shares in a Dean Witter Multi-Class Fund or in Global
Short-Term. However, in the case of shares exchanged into an Exchange Fund on or
after April 23, 1990, upon redemption of shares which results in a CDSC being
imposed, a credit (not to exceed the amount of the CDSC) will be given in an
amount equal to the Exchange Fund 12b-1 distribution fees, if any, incurred on
or after that date which are attributable to those shares. Shareholders
acquiring shares of an Exchange Fund pursuant to this exchange privilege may
exchange those shares back into a Dean Witter Multi-Class Fund or Global
Short-Term from the Exchange Fund, with no CDSC being imposed on such exchange.
The holding period previously frozen when shares were first exchanged for shares
of an Exchange Fund resumes on the last day of the month in which shares of a
Dean Witter Multi-Class Fund or Global Short-Term are reacquired. Thus, a CDSC
is imposed only upon an ultimate redemption, based upon the time (calculated as
described above) the shareholder was invested in a Dean Witter
    
 
                                       17
<PAGE>
   
Multi-Class Fund or in Global Short-Term. In the case of exchanges of Class A
shares of a Dean Witter Multi-Class Fund that are subject to a CDSC, the holding
period also includes the time (calculated as described above) the shareholder
was invested in a FSC fund.
    
 
   
    When shares initially purchased in a Dean Witter Multi-Class Fund or in
Global Short-Term are exchanged for shares of a Dean Witter Multi-Class Fund,
shares of Global Short-Term, shares of a FSC Fund, or shares of an Exchange
Fund, the date of purchase of the shares of the fund exchanged into, for
purposes of the CDSC upon redemption, will be the last day of the month in which
the shares being exchanged were originally purchased. In allocating the purchase
payments between funds for purposes of the CDSC, the amount which represents the
current net asset value of shares at the time of the exchange which were (i)
purchased more than one, three or six years (depending on the CDSC schedule
applicable to the shares) prior to the exchange, (ii) originally acquired
through reinvestment of dividends or distributions and (iii) acquired in
exchange for shares of FSC Funds, or for shares of other Dean Witter Funds for
which shares of FSC Funds have been exchanged (all such shares called "Free
Shares"), will be exchanged first. After an exchange, all dividends earned on
shares in the Exchange Funds will be considered Free Shares. If the exchanged
amount exceeds the value of such Free Shares, an exchange is made, on a
block-by-block basis, of non-Free Shares held for the longest period of time
(except that if shares held for identical periods of time but subject to
different CDSC schedules are held in the same Exchange Privilege account, the
shares of that block that are subject to a lower CDSC rate will be exchanged
prior to the shares of that block that are subject to a higher CDSC rate).
Shares equal to any appreciation in the value of non-Free Shares exchanged will
be treated as Free Shares, and the amount of the purchase payments for the
non-Free Shares of the fund exchanged into will be equal to the lesser of (a)
the purchase payments for, or (b) the current net asset value of, the exchanged
non-Free Shares. If an exchange between funds would result in exchange of only
part of a particular block of non-Free Shares, then shares equal to any
appreciation in the value of the block (up to the amount of the exchange) will
be treated as Free Shares and exchanged first, and the purchase payment for that
block will be allocated on a pro rata basis between the non-Free Shares of that
block to be retained and the non-Free Shares to be exchanged. The prorated
amount of such purchase payment attributable to the retained non-Free Shares
will remain as the purchase payment for such shares, and the amount of purchase
payment for the exchanged non-Free Shares will be equal to the lesser of (a) the
prorated amount of the purchase payment for, or (b) the current net asset value
of, those exchanged non-Free Shares. Based upon the exchange procedures
described in the Dean Witter Multi-Class Fund Prospectus under the caption
"Purchase of Fund Shares" and in the Global Short-Term Prospectus under the
caption "Contingent Deferred Sales Charge," any applicable CDSC will be imposed
upon the ultimate redemption of shares of any fund, regardless of the number of
exchanges since those shares were originally purchased.
    
 
    With respect to the redemption or repurchase of shares of the Trust, the
application of proceeds to the purchase of new shares in the Trust or any other
of the funds and the general administration of the Exchange Privilege, the
Transfer Agent acts as agent for the Distributor and for the shareholder's
Selected Broker-Dealer, if any, in the performance of such functions. With
respect to exchanges, redemptions or repurchases, the Transfer Agent shall be
liable for its own negligence and not for the default or negligence of its
correspondents or for losses in transit. The Trust shall not be liable for any
default or negligence of the Transfer Agent, the Distributor or any Selected
Broker-Dealer.
 
    Exchange Privilege accounts may also be maintained for shareholders of the
money market funds who acquired their shares in exchange for shares of various
TCW/DW Funds, a group of funds distributed by the Distributor for which TCW
Funds Management, Inc. serves as Adviser, under the terms and conditions
described in the Prospectus and Statement of Additional Information of each
TCW/DW Fund.
 
   
    The Distributor and any Selected Broker-Dealer have authorized and appointed
the Transfer Agent to act as their agent in connection with the application of
proceeds of any redemption of Trust shares to the purchase of the shares of any
other fund and the general administration of the Exchange Privilege. No
commission or discounts will be paid to the Distributor or any Selected
Broker-Dealer for any transactions pursuant to this Exchange Privilege.
    
 
                                       18
<PAGE>
   
    Shares of the Trust acquired pursuant to the Exchange Privilege will be held
by the Trust's Transfer Agent in an Exchange Privilege account distinct from any
account of the same shareholder who may have acquired shares of the Trust
directly. A shareholder of the Trust will not be permitted to make additional
investments in such Exchange Privilege account, except through the exchange of
additional shares of the fund in which the shareholder had initially invested,
and the proceeds of any shares redeemed from such Exchange Privilege account may
not thereafter be placed back into that Exchange Privilege account, except by
utilizing the Reinstatement Privilege (see "Redemptions and Repurchases --
Reinstatement Privilege" in the Dean Witter Multi-Class Fund, Global Short-Term
or FSC Fund Prospectus). If such a shareholder desires to make any additional
investments in the Trust, a separate account will be maintained for receipt of
such investments. The Trust will have additional costs for account maintenance
if a shareholder has more than one account with the Trust.
    
 
    The Trust also maintains Exchange Privilege Accounts for shareholders who
acquired their shares of the Trust pursuant to exchange privileges offered by
other investment companies with which the Investment Manager is not affiliated.
The Trust also expects to make available such exchange privilege accounts to
other investment companies that may hereafter be managed by the Investment
Manager.
 
   
    Exchanges are subject to the minimum investment requirement and any other
conditions imposed by each fund. (The minimum initial investment for the
Exchange Privilege account of each Class is $10,000 for Dean Witter Short-Term
U.S. Treasury Trust and $5,000 for Dean Witter Tax-Free Daily Income Trust, Dean
Witter Liquid Asset Fund Inc., Dean Witter California Tax-Free Income Trust and
Dean Witter New York Municipal Money Market Trust, although those funds may, at
their discretion, accept initial investments of as low as $1,000. The minimum
initial investment for the Exchange Privilege account of each Class is $5,000
for Dean Witter Special Value Fund. The minimum initial investment for the
Exchange Privilege account of each Class of the Trust and all other Dean Witter
Funds for which the Exchange Privilege is available is $1,000.) Upon exchange
into an Exchange Fund, the shares of that fund will be held in a special
Exchange Privilege Account separately from accounts of those shareholders who
have acquired their shares directly from that fund. As a result, certain
services normally available to shareholders of money market funds, including the
check writing feature, will not be available for funds held in that account.
    
 
   
    The Trust and each of the other Dean Witter Funds may limit the number of
times this Exchange Privilege may be exercised by any investor within a
specified period of time. Also, the Exchange Privilege may be terminated or
revised at any time by any of the Dean Witter Funds, upon such notice as may be
required by applicable regulatory agencies (presently sixty days' prior written
notice for termination or material revision), provided that six months' prior
written notice of termination will be given to the shareholders who hold shares
of Exchange Funds or TCW/DW North American Government Income Trust, pursuant to
this Exchange Privilege, and provided further that the Exchange Privilege may be
terminated or materially revised at times (a) when the New York Stock Exchange
is closed for other than customary weekends and holidays, (b) when trading on
the Exchange is restricted, (c) when an emergency exists as a result of which
disposal by the Fund of securities owned by it is not reasonably practicable or
it is not reasonably practicable for the Trust fairly to determine the value of
its net assets, (d) during any other period when the Securities and Exchange
Commission by order so permits (provided that applicable rules and regulations
of the Securities and Exchange Commission shall govern as to whether the
conditions prescribed in (b) or (c) exist), or (e) if the Trust would be unable
to invest amounts effectively in accordance with its objective, policies and
restrictions.
    
 
    For further information regarding the Exchange Privilege, shareholders
should contact their DWR or other Selected Broker-Dealer account executive or
the Transfer Agent.
 
   
PLAN OF DISTRIBUTION
    
 
   
    As discussed in the Prospectus, the Trust has entered into a Plan of
Distribution pursuant to Rule 12b-1 under the Act with the Distributor whereby
the expenses of certain activities in connection with the distribution of shares
of the Trust are reimbursed. A Plan was adopted by the Board of Trustees on
March 3, 1982 and an amendment to the Plan was adopted on March 21, 1983. The
first amended
    
 
                                       19
<PAGE>
   
Plan was initially approved by the Trustees on January 18, 1983 and by the
Trust's shareholders on March 17, 1983. In each case the vote of the Board of
Trustees included a majority of the Trustees who are not and were not at the
time of their vote interested persons of the Trust (as defined in the Act) and
who have and had at the time of their vote no direct or indirect financial
interest in the operation of the Plan (the "Independent 12b-1 Trustees"), cast
in person at a meeting called for the purpose of voting on such Plan.
    
 
   
    The Plan provides that the Distributor will bear the expense of all
promotional and distribution related activities on behalf of the Trust,
including personal services to shareholders and maintenance of shareholder
accounts, except for expenses that the Trustees determine to reimburse, as
described below. The Distributor, DWR, its affiliates and any other Selected
Broker-Dealer may be reimbursed for the following expenses and services under
the Plan: (1) compensation to and expenses of account executives and other
employees of the Distributor, DWR, its affiliates and other Selected
Broker-Dealers, including overhead and telephone expenses; (2) sales incentives
and bonuses to sales representatives and to marketing personnel in connection
with promoting sales of the Trust's shares; (3) expenses incurred in connection
with promoting sales of the Trust's shares; (4) preparing and distributing sales
literature; and (5) providing advertising and promotional activities, including
direct mail solicitation and television, radio, newspaper, magazine and other
media advertisements.
    
 
   
    The Trust is authorized to reimburse specific expenses incurred or to be
incurred in promoting the distribution of the Trust's shares. Reimbursement is
made through payments at the end of each month. The amount of each monthly
payment may in no event exceed an amount equal to a payment at the annual rate
of 0.15 of 1% of the Trust's average daily net assets during the month. No
interest or other financing charges, if any, incurred on any distribution
expense incurred pursuant to the Plan will be reimbursable under the Plan. In
the case of all expenses other than expenses representing a residual to account
executives, such amounts shall be determined at the beginning of each calendar
quarter by the Trustees, including a majority of the Independent 12b-1 Trustees.
Expenses representing a residual to account executives may be reimbursed without
prior determination. In the event that the Distributor proposes that monies
shall be reimbursed for other than such expenses, then in making quarterly
determinations of the amounts that may be expended by the Trust, the Distributor
will provide and the Trustees will review a quarterly budget of projected
incremental distribution expenses to be incurred on behalf of the Trust,
together with a report explaining the purposes and anticipated benefits of
incurring such expenses. The Trustees will determine which particular expenses,
and the portions thereof, that may be borne by the Trust, and in making such a
determination shall consider the scope of the Distributor's commitment to
promoting the distribution of the Trust's shares.
    
 
   
    The Distributor has informed the Trust that the entire amount of the fees
payable by the Trust each year pursuant to the Plan is characterized as a
"service fee" under the Rules of the Association of the National Association of
Securities Dealers (of which the Distributor is a member). Such fee is a payment
made for personal service and/or maintenance of shareholder accounts.
    
 
   
    At their meeting held on October 30, 1992, the Trustees of the Trust,
including all of the Independent 12b-1 Trustees, approved certain amendments to
the Plan which took effect in January, 1993 and were designed to reflect the
fact that upon an internal reorganization, the share distribution activities
theretofore performed by the Trust or for the Trust by DWR were assumed by the
Distributor and DWR's sales activities are now performed pursuant to the terms
of a selected dealer agreement between the Distributor and DWR. The amendments
provide that payments under the Plan will be made to the Distributor rather than
to the Investment Manager as before the amendment, and that the Distributor in
turn is authorized to make payments to DWR, its affiliates or other Selected
Broker-Dealers (or direct that the Trust pay such entities directly). The
Distributor is also authorized to retain part of such fee as compensation for
its own distribution-related expenses. At their meeting held on July 23, 1997,
the Trustees of the Trust, including all of the Independent 12b-1 Trustees,
approved amendments to the Plan to change the provisions regarding quarterly
budgets.
    
 
                                       20
<PAGE>
   
    DWR's account executives are credited with an annual residual commission,
currently a residual of up to 0.10% of the current value of the respective
accounts for which they are the account executives of record. The residual is a
charge which reflects residual commissions paid by DWR to its account executives
and expenses of DWR associated with the sale and promotion of Trust shares and
the servicing of shareholders' accounts, including the expenses of operating
branch offices in connection with the servicing of shareholders' accounts, which
expenses include lease costs, the salaries and employee benefits of operations
and sales support personnel, utility costs, communications costs and the costs
of stationery and supplies and other expenses relating to branch office
servicing of shareholder accounts.
    
 
   
    The Trust accrued $861,859 to the Distributor pursuant to the Plan, for the
fiscal year ended January 31, 1998. This is 0.10 of 1% of the Trust's average
daily net assets for its fiscal year ended January 31, 1998. Based upon the
total amounts spent by the Distributor during the period, it is estimated that
the amount paid by the Trust for distribution was spent in approximately the
following ways: (i) advertising -- $-0-; (ii) printing and mailing prospectuses
to other than current shareholders -- $-0-; (iii) compensation to underwriters
- -- $-0-; (iv) compensation to dealers -- $-0-; (v) compensation to sales
personnel -- $-0-; and (vi) other, which includes payments to DWR for expenses
substantially all of which relate to compensation of sales personnel and
associated overhead expenses -- $861,859.
    
 
   
    Under the Plan, the Distributor uses its best efforts in rendering services
to the Trust, but in the absence of willful misfeasance, bad faith, gross
negligence or reckless disregard of its obligations, the Distributor is not
liable to the Trust or any of its shareholders for any error of judgment or
mistake of law or for any act or omission or for any losses sustained by the
Trust or its shareholders.
    
 
   
    Under the Plan, the Distributor provides the Trust, for review by the
Trustees, and the Trustees review, promptly after the end of each calendar
quarter, a written report regarding the incremental distribution expenses
incurred by the Distributor on behalf of the Trust during such calendar quarter,
which report includes: (1) an itemization of the types of expenses and the
purposes therefor; (2) the amounts of such expenses; and (3) a description of
the benefits derived by the Trust. In the Trustees' quarterly review of the Plan
they consider its continued appropriateness and the level of compensation
provided therein.
    
 
   
    The Plan will continue from year to year, provided such continuance is
approved annually by a vote of the Trustees, including a majority of the
Independent 12b-1 Trustees. The most recent continuance of the Plan for one
year, until April 30, 1998, was approved by the Board of Trustees, including a
majority of the Independent 12b-1 Trustees, at their meeting held on April 24,
1997. Any amendment to increase materially the maximum amount authorized to be
spent under the Plan must be approved by the shareholders of the Trust, and all
material amendments to the Plan must be approved by the Trustees in the manner
described above. The Plan may be terminated at any time, without payment of any
penalty, by vote of a majority of the Independent 12b-1 Trustees or by a vote of
the holders of a majority of the outstanding voting securities of the Trust (as
defined in the Act) on not more than thirty days' written notice to any other
party to the Plan. So long as the Plan is in effect, the selection or nomination
of the Independent 12b-1 Trustees is committed to the discretion of the
Independent 12b-1 Trustees.
    
 
   
    No interested person of the Trust nor any Trustee of the Trust who is not an
interested person of the Trust, as defined in the Act, had any direct or
indirect financial interest in the operation of the Plan except to the extent
that the Distributor, InterCapital, DWSC, DWR or certain of their employees may
be deemed to have such an interest as a result of benefits derived from the
successful operation of the Plan or as a result of receiving a portion of the
amounts expended thereunder by the Trust.
    
 
DETERMINATION OF NET ASSET VALUE
 
    As discussed in the Prospectus, the net asset value of the Trust is
determined once daily at 4:00 p.m., New York time (or, on days when the New York
Stock Exchange closes prior to 4:00 p.m., at such earlier time), on each day
that the New York Stock Exchange is open. The New York Stock Exchange
 
                                       21
<PAGE>
   
currently observes the following holidays: New Year's Day, Reverend Dr. Martin
Luther King, Jr. Day, Presidents' Day, Good Friday, Memorial Day, Independence
Day, Labor Day, Thanksgiving Day and Christmas Day.
    
 
    The Trust utilizes the amortized cost method in valuing its portfolio
securities for purposes of determining the net asset value of the shares of the
Trust. The Trust utilizes the amortized cost method in valuing its portfolio
securities even though the portfolio securities may increase or decrease in
market value, generally, in connection with changes in interest rates. The
amortized cost method of valuation involves valuing a security at its cost
adjusted by 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 the Trust would receive if it sold the instrument. During
such periods, the yield to investors in the Trust may differ somewhat from that
obtained in a similar company which uses mark to market values for all its
portfolio securities. For example, if the use of amortized cost resulted in a
lower (higher) aggregate portfolio value on a particular day, a prospective
investor in the Trust would be able to obtain a somewhat higher (lower) yield
than would result from investment in such a similar company and existing
investors would receive less (more) investment income. The purpose of this
method of calculation is to facilitate the maintenance of a constant net asset
value per share of $1.00.
 
    The Trust's use of the amortized cost method to value its portfolio
securities and the maintenance of the per share net asset value of $1.00 is
permitted pursuant to Rule 2a-7 of the Act (the "Rule"), and is conditioned on
its compliance with various conditions including: (a) the Trustees are
obligated, as a particular responsibility within the overall duty of care owed
to the Trust's shareholders, to establish procedures reasonably designed, taking
into account current market conditions and the Trust's investment objectives, to
stabilize the net asset value per share as computed for the purpose of
distribution and redemption at $1.00 per share; (b) the procedures include (i)
calculation, at such intervals as the Trustees determine are appropriate and as
are reasonable in light of current market conditions, of the deviation, if any,
between net asset value per share using amortized cost to value portfolio
securities and net asset value per share based upon available market quotations
with respect to such portfolio securities; (ii) periodic review by the Trustees
of the amount of deviation as well as methods used to calculate it; and (iii)
maintenance of written records of the procedures, the Trustees' considerations
made pursuant to them and any actions taken upon such considerations; (c) the
Trustees should consider what steps should be taken, if any, in the event of a
difference of more than 1/2 of 1% between the two methods of valuation; and (d)
the Trustees should take such action as they deem appropriate (such as
shortening the average portfolio maturity, realizing gains or losses or, as
provided by the Declaration of Trust, reducing the number of the outstanding
shares of the Trust) to eliminate or reduce to the extent reasonably practicable
material dilution or other unfair results to investors or existing shareholders.
Any reduction of outstanding shares will be effected by having each shareholder
proportionately contribute to the Trust's capital the necessary shares that
represent the amount of excess upon such determination. Each shareholder will be
deemed to have agreed to such contribution in these circumstances by investment
in the Trust.
 
    The Rule further requires that the Trust limit its investments to U.S.
dollar-denominated instruments which the Trustees determine present minimal
credit risks and which are Eligible Securities as defined below. The Rule also
requires the Trust to maintain a dollar-weighted average portfolio maturity (not
more than 90 days) appropriate to its objective of maintaining a stable net
asset value of $1.00 per share and precludes the purchase of any instrument with
a remaining maturity of more than thirteen months. Should the disposition of a
portfolio security result in a dollar-weighted average portfolio maturity of
more than 90 days, the Trust would be required to invest its available cash in
such a manner as to reduce such maturity to 90 days or less as soon as
reasonably practicable.
 
    Generally, for purposes of the procedures adopted under the Rule, the
maturity of a portfolio instrument is deemed to be the period remaining
(calculated from the trade date or such other date on
 
                                       22
<PAGE>
which the Trust's interest in the instrument is subject to market action) until
the date noted on the face of the instrument as the date on which the principal
amount must be paid, or in the case of an instrument called for redemption, the
date on which the redemption payment must be made.
 
    A variable rate obligation that is subject to a demand feature is deemed to
have a maturity equal to the longer of the period remaining until the next
readjustment of the interest rate or the period remaining until the principal
amount can be recovered through demand. A floating rate instrument that is
subject to a demand feature is deemed to have a maturity equal to the period
remaining until the principal amount can be recovered through demand.
 
    A "NRSRO" is a nationally recognized statistical rating organization. The
term "Requisite NRSROs" means (i) any two NRSROs that have issued a rating with
respect to a security or class of debt obligations of an issuer, or (ii) if only
one NRSRO has issued a rating with respect to such security or issuer at the
time a fund purchases or rolls over the security, that NRSRO.
 
    An Eligible Security is generally defined in the Rule to mean (i) a security
with a remaining maturity of 397 calendar days or less that has received a
short-term rating (or that has been issued by an issuer that has received a
short-term rating with respect to a class of debt obligations, or any debt
obligation within that class, that is comparable in priority and security with
the security) by the Requisite NRSROs in one of the two highest short-term
rating categories (within which there may be sub-categories or gradations
indicating relative standing); or (ii) a security: (A) that at the time of
issuance had a remaining maturity of more than 397 calendar days but that has a
remaining maturity of 397 calendar days or less; and (B) whose issuer has
received from the Requisite NRSROs a rating with respect to a class of debt
obligations (or any debt obligation within that class) that is now comparable in
priority and security with the security, in one of the two highest short-term
rating categories (within which there may be sub-categories or gradations
indicating relative standing); or (iii) an unrated security that is of
comparable quality to a security meeting the requirements of (i) or (ii) above,
as determined by the money market fund's board of directors.
 
    As permitted by the Rule, the Trustees have delegated to the Trust's
Investment Manager, subject to the Trustees' oversight pursuant to guidelines
and procedures adopted by the Trustees, the authority to determine which
securities present minimal credit risks and which unrated securities are
comparable in quality to rated securities.
 
    If the Trustees determine that it is no longer in the best interests of the
Trust and its shareholders to maintain a stable price of $1.00 per share, or if
the Trustees believe that maintaining such price no longer reflects a
market-based net asset value per share, the Trustees have the right to change
from an amortized cost basis of valuation to valuation based on market
quotations. The Trust will notify shareholders of any such change.
 
    The Trust will manage its portfolio in an effort to maintain a constant
$1.00 per share price, but it cannot assure that the value of its shares will
never deviate from this price. Since dividends from net investment income (and
net short-term capital gains, if any) are declared and reinvested on a daily
basis, the net asset value per share, under ordinary circumstances, is likely to
remain constant. Otherwise, realized and unrealized gains and losses will not be
distributed on a daily basis but will be reflected in the Trust's net asset
value. The amounts of such gains and losses will be considered by the Trustees
in determining the action to be taken to maintain the Trust's $1.00 per share
net asset value. Such action may include distribution at any time of part or all
of the then accumulated undistributed net realized capital gains, or reduction
or elimination of daily dividends by an amount equal to part or all of the then
accumulated net realized capital losses. However, if realized losses should
exceed the sum of net investment income plus realized gains on any day, the net
asset value per share on that day might decline below $1.00 per share. In such
circumstances, the Trust may reduce or eliminate the payment of daily dividends
for a period of time in an effort to restore the Trust's $1.00 per share net
asset value. A decline in prices of securities could result in significant
unrealized depreciation on a mark to market
 
                                       23
<PAGE>
basis. Under these circumstances the Trust may reduce or eliminate the payment
of dividends and utilize a net asset value per share as determined by using
available market quotations or reduce the number of its shares outstanding.
 
REDEMPTION OF TRUST SHARES
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, shares of the Trust may be redeemed at net
asset value at any time. When a redemption is made by check and a check is
presented to the Transfer Agent for payment, the Transfer Agent will redeem a
sufficient number of full and fractional shares in the shareholder's account to
cover the amount of the check. This enables the shareholder to continue earning
daily income dividends until the check has cleared.
 
    A check drawn by a shareholder against his or her account in the Trust
constitutes a request for redemption of a number of shares sufficient to provide
proceeds equal to the amount of the check. Payment of the proceeds will normally
be made on the next business day after receipt by the Transfer Agent of the
check in proper form. If a check is presented for payment to the Transfer Agent
by a shareholder or payee in person, the Transfer Agent will make payment by
means of a check drawn on the Trust's account or, in the case of a shareholder
payee, to the shareholder's predesignated bank account, but will not make
payment in cash.
 
    The Trust reserves the right to suspend redemptions or postpone the date of
payment (1) for any periods during which the New York Stock Exchange is closed
(other than for customary weekend and holiday closings), (2) when trading on
that Exchange is restricted or an emergency exists, as determined by the
Securities and Exchange Commission, so that disposal of the Trust's investments
or determination of the Trust's net asset value is not reasonably practicable,
or (3) for such other periods as the Commission by order may permit for the
protection of the Trust's investors.
 
    As discussed in the Prospectus, due to the relatively high cost of handling
small investments, the Trust reserves the right to redeem, at net asset value,
the shares of any shareholder (other than shares held in an Individual
Retirement Account or custodial account under Section 403(b)(7) of the Internal
Revenue Code) whose shares due to redemptions by the shareholder have a value of
less than $500 or such lesser amounts as may be fixed by the Trustees. However,
before the Trust redeems such shares and sends the proceeds to the shareholder,
it will notify the shareholder that the value of his or her shares is less than
$500 and allow him or her sixty days to make an additional investment in an
amount which will increase the value of his or her account to $500 or more
before the redemption is processed.
 
   
    It has been and remains the Trust's policy and practice that, if checks for
redemption proceeds remain uncashed, no interest will accrue on amounts
represented by such uncashed checks.
    
 
    SYSTEMATIC WITHDRAWAL PLAN.  As discussed in the Prospectus, a systematic
withdrawal plan is available for shareholders who own or purchase shares of the
Trust having a minimum value of at least $5,000, which provides for monthly or
quarterly checks in any dollar amount not less than $25 or in any whole
percentage of the account balance, on an annualized basis. The Transfer Agent
acts as agent for the shareholder in tendering to the Trust for redemption
sufficient full and fractional shares to provide the amount of the periodic
withdrawal payment designated in the application. The shares will be redeemed at
their net asset value determined, at the shareholder's option, on the tenth or
twenty-fifth day (or next business day) of the relevant month or quarter and
normally a check for the proceeds will be mailed by the Transfer Agent within
five days after the date of redemption. The withdrawal plan may be terminated at
any time by the Trust.
 
    Any shareholder who wishes to have payments under the withdrawal plan made
to a third party, or sent to an address other than the one listed on the
account, must send complete written instructions to the Transfer Agent to enroll
in the withdrawal plan. The shareholder's signature on such instructions must be
guaranteed by an eligible guarantor acceptable to the Transfer Agent
(shareholders should contact the Transfer Agent for a determination as to
whether a particular institution is such an eligible guarantor). A shareholder
may, at any time, change the amount and interval of withdrawal payments
 
                                       24
<PAGE>
through his or her Account Executive or by written notification to the Transfer
Agent. In addition, the party and/or the address to which checks are mailed may
be changed by written notification to the Transfer Agent, with signature
guarantees required in the manner described above. The shareholder may also
terminate the withdrawal plan at any time by written notice to the Transfer
Agent. In the event of such termination, the account will be continued as a
regular shareholder investment account. The shareholder may also redeem all or
part of the shares held in the withdrawal plan account (see "Redemption of Trust
Shares" in the Prospectus) at any time. If the number of shares redeemed is
greater than the number of shares paid as dividends, such redemptions may, of
course, eventually result in liquidation of all the shares in the account. The
systematic withdrawal plan is not available for shares held in an Exchange
Privilege Account.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
   
    DIVIDENDS AND DISTRIBUTIONS.  As discussed in the Prospectus, the Trust
intends to distribute all of its daily net investment income (and net short-term
capital gains, if any) to shareholders of record as of the close of business the
preceding business day. Net income, for dividend purposes, includes accrued
interest and amortization of acquisition, original issue and market discount,
plus or minus any short-term gains or losses realized on sales of portfolio
securities, less the amortization of market premium and the estimated expenses
of the Trust. Net income will be calculated immediately prior to the
determination of net asset value per share of the Trust.
    
 
    The Trustees of the Trust may revise the dividend policy, or postpone the
payment of dividends, if the Trust should have or anticipate any large
unexpected expense, loss or fluctuation in net assets which, in the opinion of
the Trustees, might have a significant adverse effect on shareholders. On
occasion, in order to maintain a constant $1.00 per share net asset value, the
Trustees may direct that the number of outstanding shares be reduced in each
shareholder's account. Such reduction may result in taxable income to a
shareholder in excess of the net increase (i.e., dividends, less such
reductions), if any, in the shareholder's account for a period of time.
Furthermore, such reduction may be realized as a capital loss when the shares
are liquidated.
 
   
    It has been and remains the Trust's policy and practice that, if checks for
dividends or distributions paid in cash remain uncashed, no interest will accrue
on amounts represented by such uncashed checks.
    
 
    TAXES.  The Trust has qualified and intends to remain qualified as a
regulated investment company under Subchapter M of the Internal Revenue Code. If
so qualified, the Trust will not be subject to federal income taxes, provided
that it distributes all of its taxable net investment income and all of its net
realized gains.
 
   
    Shareholders will be subject to federal income tax on dividends paid from
interest income derived from taxable securities and on distributions of realized
net short-term capital gains and long-term capital gains. Interest and realized
net short-term capital gains distributions are taxable to the shareholder as
ordinary dividend income regardless of whether the shareholder receives such
distributions in additional shares or in cash. Since the Trust's income is
expected to be derived entirely from interest rather than dividends, none of
such distributions will be eligible for the federal dividends received deduction
available to corporations. Realized net long-term capital gains distributions,
which are taxable as long-term capital gains, are not eligible for the dividends
received deduction.
    
 
    Under present Massachusetts law, the Trust is not subject to any
Massachusetts income tax during any fiscal year in which the Trust qualifies as
a regulated investment company. The Trust might be subject to Massachusetts
income taxes for any taxable year in which it does not so qualify as a regulated
investment company.
 
    The Trust may be subject to tax or taxes in certain states where it does
business. Furthermore, in those states which have income tax laws, the tax
treatment of the Trust and of shareholders with respect to distributions by the
Trust may differ from federal tax treatment.
 
                                       25
<PAGE>
    Shareholders are urged to consult their own tax advisers regarding specific
questions as to federal, state or local taxes.
 
INFORMATION ON COMPUTATION OF YIELD
 
   
    The Trust's current yield for the seven days ending January 31, 1998 was
4.86%. The effective annual yield on 4.86% is 4.98%, assuming daily compounding.
    
 
    The Trust's annualized current yield, as may be quoted from time to time in
advertisements and other communications to shareholders and potential investors,
is computed by determining, for a stated seven-day period, the net change,
exclusive of capital changes and including the value of additional shares
purchased with dividends and any dividends declared therefrom (which reflect
deductions of all expenses of the Trust such as management fees), in the value
of a hypothetical pre-existing account having a balance of one share at the
beginning of the period, and dividing the difference by the value of the account
at the beginning of the base period to obtain the base period return, and then
multiplying the base period return by (365/7).
 
    The Trust's annualized effective yield, as may be quoted from time to time
in advertisements and other communications to shareholders and potential
investors, is computed by determining (for the same stated seven-day period as
the current yield), the net change, exclusive of capital changes and including
the value of additional shares purchased with dividends and any dividends
declared therefrom (which reflect deductions of all expenses of the Trust such
as management fees), in the value of a hypothetical pre-existing account having
a balance of one share at the beginning of the period, and dividing the
difference by the value of the account at the beginning of the base period to
obtain the base period return, and then compounding the base period return by
adding 1, raising the sum to a power equal to 365 divided by 7, and subtracting
1 from the result.
 
    The yields quoted in any advertisement or other communication should not be
considered a representation of the yields of the Trust in the future since the
yield is not fixed. Actual yields will depend not only on the type, quality and
maturities of the investments held by Trust and changes in interest rates on
such investments, but also on changes in the Trust's expenses during the period.
 
    Yield information may be useful in reviewing the performance of the Trust
and for providing a basis for comparison with other investment alternatives.
However, unlike bank deposits or other investments which typically pay a fixed
yield for a stated period of time, the Trust's yield fluctuates.
 
   
    The Trust may also advertise the growth of hypothetical investments of
$10,000, $50,000 and $100,000 in shares of the Trust by adding the sum of all
distributions on 10,000, 50,000 or 100,000 shares of the Trust since inception
to $10,000, $50,000 and $100,000, as the case may be. Investments of $10,000,
$50,000 and $100,000 in the Trust at inception (February 17, 1982) would have
grown to $25,736, $126,680 and $257,360, respectively, at January 31, 1998.
    
 
SHARES OF THE TRUST
- --------------------------------------------------------------------------------
 
   
    The shareholders of the Trust are entitled to a full vote for each full
share held. All of the Trustees have been elected by the shareholders of the
Trust, most recently at a Special Meeting of Shareholders held on May 21, 1997.
The Trustees themselves have the power to alter the number and the terms of
office of the Trustees (as provided for in the Declaration of Trust), and they
may at any time lengthen or shorten their own terms or make their terms of
unlimited duration and appoint their own successors, provided that always at
least a majority of the Trustees has been elected by the shareholders of the
Trust. Under certain circumstances, the Trustees may be removed by action of the
Trustees. The shareholders also have the right, under certain circumstances, to
remove the Trustees. The voting rights of shareholders are not cumulative, so
that holders of more than fifty percent of the shares voting can, if they
choose, elect all Trustees being selected, while the holders of the remaining
shares would be unable to elect any Trustees.
    
 
                                       26
<PAGE>
    The Declaration of Trust permits the Trustees to authorize the creation of
additional series of shares (the proceeds of which would be invested in
separate, independently managed portfolios) and additional classes of shares
within any series (which would be used to distinguish among the rights of
different categories of shareholders, as might be required by future regulations
or other unforeseen circumstances). The Trustees have not presently authorized
any such additional series or classes of shares.
 
    The Declaration of Trust further provides that no Trustee, officer, employee
or agent of the Trust is liable to the Trust or to a shareholder, nor is any
Trustee, officer, employee or agent liable to any third persons in connection
with the affairs of the Trust, except as such liability may arise from his, her
or its own bad faith, willful misfeasance, gross negligence, or reckless
disregard of his, her or its duties. It also provides that all third persons
shall look solely to the Trust property for satisfaction of claims arising in
connection with the affairs of the Trust. With the exceptions stated, the
Declaration of Trust provides that a Trustee, officer, employee or agent is
entitled to be indemnified against all liability in connection with the affairs
of the Trust.
 
    The Trust is authorized to issue an unlimited number of shares of beneficial
interest. The Trust shall be of unlimited duration subject to the provisions in
the Declaration of Trust concerning termination by action of the shareholders.
 
CUSTODIAN AND TRANSFER AGENT
- --------------------------------------------------------------------------------
 
    The Bank of New York, 90 Washington Street, New York, New York 10286 is the
Custodian of the Trust's assets. Any of the Trust's cash balances with the
Custodian in excess of $100,000 are unprotected by Federal deposit insurance.
Such balances may, at times, be substantial.
 
   
    Dean Witter Trust FSB, Harborside Financial Center, Plaza Two, Jersey City,
New Jersey 07311 is the Transfer Agent of the Trust's shares and Dividend
Disbursing Agent for payment of dividends and distributions on Trust shares and
Agent for shareholders under various investment plans described herein. Dean
Witter Trust FSB is an affiliate of Dean Witter InterCapital Inc., the Trust's
Investment Manager, and Dean Witter Distributors Inc., the Trust's Distributor.
As Transfer Agent and Dividend Disbursing Agent, Dean Witter Trust FSB's
responsibilities include maintaining shareholder accounts, disbursing cash
dividends and reinvesting dividends, processing account registration changes,
handling purchase and redemption transactions, mailing prospectuses and reports,
mailing and tabulating proxies, processing share certificate transactions, and
maintaining shareholder records and lists. For these services Dean Witter Trust
FSB receives a per shareholder account fee from the Trust.
    
 
INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
    Price Waterhouse LLP, 1177 Avenue of the Americas, New York, New York 10036
serves as the independent accountants of the Trust. The independent accountants
are responsible for auditing the annual financial statements of the Trust.
 
REPORTS TO SHAREHOLDERS
- --------------------------------------------------------------------------------
 
    The Trust will send to shareholders, at least semi-annually, reports showing
the Trust's portfolio and other information. An annual report, containing
financial statements audited by independent accountants, will be sent to
shareholders each year.
 
    The Trust's fiscal year ends on January 31. The financial statements of the
Trust must be audited at least once a year by independent accountants whose
selection is made annually by the Trust's Board of Trustees.
 
                                       27
<PAGE>
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
    Barry Fink, Esq., who is an officer and the General Counsel of the
Investment Manager, is an officer and the General Counsel of the Trust.
 
EXPERTS
- --------------------------------------------------------------------------------
 
    The financial statements of the Trust included in the Prospectus and
incorporated by reference in this Statement of Additional Information have been
so included and incorporated in reliance on the report of Price Waterhouse LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.
 
REGISTRATION STATEMENT
- --------------------------------------------------------------------------------
 
    This Statement of Additional Information and the Prospectus do not contain
all of the information set forth in the Registration Statement the Trust has
filed with the Securities and Exchange Commission. The complete Registration
Statement may be obtained from the Securities and Exchange Commission upon
payment of the fee prescribed by the rules and regulations of the Commission.
 
FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
   
    The audited financial statements of the Trust for the fiscal year ended
January 31, 1998, and the report of the independent accountants thereon, are set
forth in the Trust's Prospectus, and are incorporated herein by reference.
    
 
                                       28
<PAGE>

                   DEAN WITTER U. S. GOVERNMENT MONEY MARKET TRUST

                              PART C  OTHER INFORMATION

Item 24.  Financial Statements and Exhibits

   (a)  FINANCIAL STATEMENTS

       (1)   Financial statements and schedules, included in Prospectus (Part
             A):
                                                                      Page in
                                                                      Prospectus
                                                                      ----------
             Financial highlights for the years ended 
             January 31,1989, 1990, 1991, 1992, 1993, 1994, 
             1995, 1996, 1997 and 1998. . . . . . . . . . . . . . . .      4

             Portfolio of Investments at January 31, 1998 . . . . . .     18

             Statement of Assets and Liabilities at January 31,1998 .     19

             Statement of Operations for the year ended
             January 31, 1998 . . . . . . . . . . . . . . . . . . . .     20

             Statement of Changes in Net Assets for the 
             years ended January 31,1997 and January 31, 1998 . . . .     21

             Notes to Financial Statements. . . . . . . . . . . . . .     22

       (2)   Financial statements included in the Statement of 
             Additional Information (Part B):

             None

       (3)   Financial statements included in Part C:

             None

   (b)  EXHIBITS:

           2.    -  Amended and Restated By-Laws of the Registrant dated as of
                    October 23, 1997.

           5.    -  Form of Investment Management Agreement between the
                    Registrant and Dean Witter InterCapital Inc.

           6.    -  Form of Distribution Agreement between the Registrant and
                    Dean Witter Distributors Inc.

           8.    -  Form of Transfer Agency and Services Agreement between the 
                    Registrant and Dean Witter Trust FSB

          11.    -  Consent of Independent Accountants

<PAGE>

          15.    -  Form of Amended and Restated Plan of Distribution 
                    Pursuant to Rule 12b-1

          16.    -  Schedules for Computation of Performance Quotations 

          27.    -  Financial Data Schedule

       Other.    -  Power of Attorney


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

     All other exhibits were previously filed via EDGAR and are hereby
     incorporated by reference.

Item 25.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.

          None

Item 26.  NUMBER OF HOLDERS OF SECURITIES.

           (1)                               (2)
                                       Number of Record Holders
     Title of Class                     At January 31, 1998
     --------------                    ------------------------

Shares of Beneficial Interest                 302,208

Item 27.  INDEMNIFICATION.

     Pursuant to Section 5.3 of the Registrant's Declaration of Trust and under
Section 4.8 of the Registrant's By-Laws, the indemnification of the Registrant's
trustees, officers, employees and agents is permitted if it is determined that
they acted under the belief that their actions were in or not opposed to the
best interest of the Registrant, and, with respect to any criminal proceeding,
they had reasonable cause to believe their conduct was not unlawful.  In
addition, indemnification is permitted only if it is determined that the actions
in question did not render them liable by reason of willful misfeasance, bad
faith or gross negligence in the performance of their duties or by reason of
reckless disregard of their obligations and duties to the Registrant.  Trustees,
officers, employees and agents will be indemnified for the expense of litigation
if it is determined that they are entitled to indemnification against any
liability established in such litigation.  The Registrant may also advance money
for these expenses provided that they give their undertakings to repay the
Registrant unless their conduct is later determined to permit indemnification.
   
     Pursuant to Section 5.2 of the Registrant's Declaration of Trust and
paragraph 8 of the Registrant's Investment Management Agreement, neither the
Investment Manager nor any trustee, officer, employee or agent of the Registrant
shall be liable for any action or failure to act, except in the case of bad
faith, willful misfeasance, gross negligence or reckless disregard of duties to
the Registrant.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Act") may be permitted to trustees, officers and controlling
persons of the Registrant pursuant to the foregoing provisions or otherwise, the
Registrant has been advised that in the opinion of the  Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable.  In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a trustee, officer, or controlling person of the Registrant
in connection with the successful defense of any action, suit or proceeding) is
asserted against the Registrant by such trustee, officer or controlling person
in connection with the shares being registered, the Registrant will, unless in
the opinion of its counsel the matter has

                                       2 

<PAGE>

been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act, and will be governed by the final adjudication
of such issue.

     The Registrant hereby undertakes that it will apply the indemnification
provision of its by-laws in a manner consistent with Release 11330 of the
Securities and Exchange Commission under the Investment Company Act of 1940, so
long as the interpretation of Sections 17(h) and 17(i) of such Act remains in
effect.

     Registrant, in conjunction with the Investment Manager, Registrant's
Trustees, and other registered investment management companies managed by the
Investment Manager, maintains insurance on behalf of any person who is or was a
Trustee, officer, employee, or agent of Registrant, or who is or was serving at
the request of Registrant as a trustee, director, officer, employee or agent of
another trust or corporation, against any liability asserted against him and
incurred by him or arising out of his position.  However, in no event will
Registrant maintain insurance to indemnify any such person for any act for which
Registrant itself is not permitted to indemnify him.

Item 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.

     See "The Fund and Its Management" in the Prospectus regarding the business
of the investment adviser.  The following information is given regarding
officers of Dean Witter InterCapital Inc.  InterCapital is a wholly-owned
subsidiary of Morgan Stanley, Dean Witter, Discover & Co.  The principal address
of the Dean Witter Funds is Two World Trade Center, New York, New York 10048.

     The term "Dean Witter Funds" used below refers to the following registered
investment companies:

CLOSED-END INVESTMENT COMPANIES
 (1) InterCapital Income Securities Inc.
 (2) High Income Advantage Trust
 (3) High Income Advantage Trust II
 (4) High Income Advantage Trust III
 (5) Municipal Income Trust
 (6) Municipal Income Trust II
 (7) Municipal Income Trust III
 (8) Dean Witter Government Income Trust
 (9) Municipal Premium Income Trust
(10) Municipal Income Opportunities Trust
(11) Municipal Income Opportunities Trust II
(12) Municipal Income Opportunities Trust III
(13) Prime Income Trust
(14) InterCapital Insured Municipal Bond Trust
(15) InterCapital Quality Municipal Income Trust
(16) InterCapital Quality Municipal Investment Trust
(17) InterCapital Insured Municipal Income Trust
(18) InterCapital California Insured Municipal Income Trust
(19) InterCapital Insured Municipal Trust
(20) InterCapital Quality Municipal Securities
(21) InterCapital New York Quality Municipal Securities
(22) InterCapital California Quality Municipal Securities
(23) InterCapital Insured California Municipal Securities 
(24) InterCapital Insured Municipal Securities

                                       3
<PAGE>

OPEN-END INVESTMENT COMPANIES:
 (1) Dean Witter Short-Term Bond Fund
 (2) Dean Witter Tax-Exempt Securities Trust
 (3) Dean Witter Tax-Free Daily Income Trust
 (4) Dean Witter Dividend Growth Securities Inc.
 (5) Dean Witter Convertible Securities Trust
 (6) Dean Witter Liquid Asset Fund Inc.
 (7) Dean Witter Developing Growth Securities Trust
 (8) Dean Witter Retirement Series
 (9) Dean Witter Federal Securities Trust
(10) Dean Witter World Wide Investment Trust
(11) Dean Witter U.S. Government Securities Trust
(12) Dean Witter Select Municipal Reinvestment Fund
(13) Dean Witter High Yield Securities Inc.
(14) Dean Witter Intermediate Income Securities
(15) Dean Witter New York Tax-Free Income Fund
(16) Dean Witter California Tax-Free Income Fund
(17) Dean Witter Health Sciences Trust
(18) Dean Witter California Tax-Free Daily Income Trust
(19) Dean Witter Global Asset Allocation Fund
(20) Dean Witter American Value Fund
(21) Dean Witter Strategist Fund
(22) Dean Witter Utilities Fund
(23) Dean Witter World Wide Income Trust
(24) Dean Witter New York Municipal Money Market Trust
(25) Dean Witter Capital Growth Securities
(26) Dean Witter Precious Metals and Minerals Trust
(27) Dean Witter European Growth Fund Inc.
(28) Dean Witter Global Short-Term Income Fund Inc.
(29) Dean Witter Pacific Growth Fund Inc.
(30) Dean Witter Multi-State Municipal Series Trust
(31) Dean Witter Short-Term U.S. Treasury Trust
(32) Dean Witter Diversified Income Trust
(33) Dean Witter U.S. Government Money Market Trust
(34) Dean Witter Global Dividend Growth Securities
(35) Active Assets California Tax-Free Trust
(36) Dean Witter Natural Resource Development Securities Inc.
(37) Active Assets Government Securities Trust
(38) Active Assets Money Trust
(39) Active Assets Tax-Free Trust
(40) Dean Witter Limited Term Municipal Trust
(41) Dean Witter Variable Investment Series
(42) Dean Witter Value-Added Market Series
(43) Dean Witter Global Utilities Fund
(44) Dean Witter International SmallCap Fund
(45) Dean Witter Mid-Cap Growth Fund
(46) Dean Witter Select Dimensions Investment Series
(47) Dean Witter Balanced Growth Fund
(48) Dean Witter Balanced Income Fund

                                       4
<PAGE>

(49) Dean Witter Hawaii Municipal Trust
(50) Dean Witter Capital Appreciation Fund
(51) Dean Witter Intermediate Term U.S. Treasury Trust 
(52) Dean Witter Information Fund
(53) Dean Witter Japan Fund
(54) Dean Witter Income Builder Fund
(55) Dean Witter Special Value Fund
(56) Dean Witter Financial Services Trust
(57) Dean Witter Market Leader Trust
(58) Dean Witter S&P 500 Index Fund
(59) Dean Witter Fund of Funds
(60) Morgan Stanley Dean Witter Competitive Edge Fund

The term "TCW/DW Funds" refers to the following registered investment companies:

OPEN-END INVESTMENT COMPANIES
 (1) TCW/DW Core Equity Trust
 (2) TCW/DW North American Government Income Trust
 (3) TCW/DW Latin American Growth Fund
 (4) TCW/DW Income and Growth Fund 
 (5) TCW/DW Small Cap Growth Fund
 (6) TCW/DW Balanced Fund 
 (7) TCW/DW Total Return Trust
 (8) TCW/DW Mid-Cap Equity Trust
 (9) TCW/DW Global Telecom Trust
(10) TCW/DW Strategic Income Trust
(11) TCW/DW Emerging Markets Opportunities Trust

CLOSED-END INVESTMENT COMPANIES 
 (1) TCW/DW Term Trust 2000
 (2) TCW/DW Term Trust 2002 
 (3) TCW/DW Term Trust 2003

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Charles A. Fiumefreddo        Executive Vice President and Director of Dean 
Chairman, Chief Executive     Witter Reynolds Inc. ("DWR"); Chairman, Chief 
Officer and Director          Executive Officer and Director of Dean Witter
                              Distributors Inc. ("Distributors") and Dean Witter
                              Services Company Inc. ("DWSC"); Chairman and
                              Director of Dean Witter Trust FSB ("DWT");
                              Chairman, Director or Trustee, President and Chief
                              Executive Officer of the Dean Witter Funds and
                              Chairman, Chief Executive Officer and Trustee of
                              the TCW/DW Funds; Director and/or officer of
                              various Morgan Stanley, Dean Witter, Discover &
                              Co. ("MSDWD") subsidiaries.

Philip J. Purcell             Chairman, Chief Executive Officer and Director of
Director                      MSDWD and DWR; Director of DWSC and Distributors;
                              Director or Trustee of the Dean Witter Funds;
                              Director and/or officer of various MSDWD
                              subsidiaries.


                                       5

<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Richard M. DeMartini          President and Chief Operating Officer of Dean 
Director                      Witter Capital, a division of DWR; Director of
                              DWR, DWSC, Distributors and DWT; Trustee of the
                              TCW/DW Funds.



James F. Higgins              President and Chief Operating Officer of Dean
Director                      Witter Financial; Director of DWR, DWSC,
                              Distributors and DWT.

Thomas C. Schneider           Executive Vice President and Chief Strategic of 
Executive Vice                MSDWD; Executive Vice President and Chief 
President, Chief              Financial Officer of DWSC and Distributors; 
Financial Officer and         Director of DWR, DWSC, Distributors and MSDWD.
Director

Christine A. Edwards          Executive Vice President, Chief Legal Officer and 
Director                      Secretary of MSDWD; Executive Vice President,
                              Secretary and Chief Legal Officer of Distributors;
                              Director of DWR, DWSC and Distributors.

Mitchell M. Merin             President and Chief Strategic Officer of DWSC, 
President and Chief           Executive Vice President of Distributors;
Strategic Officer             Executive Vice President and Director of DWT;
                              Executive Vice President and Director of DWR;
                              Director of SPS Transaction Services Inc. and
                              various other MSDWD subsidiaries.

Robert M. Scanlan             President and Chief Operating Officer of DWSC, 
President and Chief           Executive Vice President of Distributors; 
Operating Officer             Executive Vice President and Director of DWT; Vice
                              President of the Dean Witter Funds and the TCW/DW
                              Funds.

John B. Van Heuvelen          President, Chief Operating Officer and Director of
Executive Vice                DWT.
President

Joseph J. McAlinden           Vice President of the Dean Witter Funds and 
Executive Vice President      Director of DWT.
and Chief Investment
Officer

Edward C. Oelsner III
Executive Vice President

Barry Fink                    Assistant Secretary of DWR; Senior Vice President,
Senior Vice President,        Secretary and General Counsel of DWSC; Senior Vice
Secretary and General         President, Assistant Secretary and Assistant 
Counsel                       General Counsel of Distributors; Vice President,
                              Secretary and General Counsel of the Dean Witter
                              Funds and the TCW/DW Funds.

Peter M. Avelar               Vice President of various Dean Witter Funds.
Senior Vice President

                                       6
<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Mark Bavoso                   Vice President of various Dean Witter Funds.
Senior Vice President

Richard Felegy
Senior Vice President

Edward F. Gaylor              Vice President of various Dean Witter Funds.
Senior Vice President

Robert S. Giambrone           Senior Vice President of DWSC, Distributors and 
Senior Vice President         DWT and Director of DWT; Vice President of the
                              Dean Witter Funds and the TCW/DW Funds.

Rajesh K. Gupta               Vice President of various Dean Witter Funds.
Senior Vice President

Kenton J. Hinchliffe          Vice President of various Dean Witter Funds.
Senior Vice President

Kevin Hurley                  Vice President of various Dean Witter Funds.
Senior Vice President

Margaret Iannuzzi
Senior Vice President

Jenny Beth Jones              Vice President of Dean Witter Special Value Fund.
Senior Vice President

John B. Kemp, III             President of Distributors
Senior Vice President

Anita H. Kolleeny             Vice President of various Dean Witter Funds.
Senior Vice President

Jonathan R. Page              Vice President of various Dean Witter Funds.
Senior Vice President

Ira N. Ross                   Vice President of various Dean Witter Funds.
Senior Vice President

Guy G. Rutherfurd, Jr.        Vice President of Dean Witter Market Leader Trust.
Senior Vice President

Rochelle G. Siegel            Vice President of various Dean Witter Funds.
Senior Vice President

                                       7
<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Jayne M. Stevlingson          Vice President of various Dean Witter Funds.
Senior Vice President

Paul D. Vance                 Vice President of various Dean Witter Funds.
Senior Vice President

Elizabeth A. Vetell
Senior Vice President

James F. Willison             Vice President of various Dean Witter Funds.
Senior Vice President

Ronald J. Worobel             Vice President of various Dean Witter Funds.
Senior Vice President

Douglas Brown
First Vice President

Thomas F. Caloia              First Vice President and Assistant Treasurer of 
First Vice President          DWSC, Assistant Treasurer of Distributors; 
and Assistant                 Treasurer and Chief Financial Officer of the Dean 
Treasurer                     Witter Funds and the TCW/DW Funds.

Thomas Chronert
First Vice President

Rosalie Clough
First Vice President

Marilyn K. Cranney            Assistant Secretary of DWR; First Vice President 
First Vice President          and Assistant Secretary of DWSC; Assistant 
and Assistant Secretary       Secretary of the Dean Witter Funds and the TCW/DW
                              Funds.

Michael Interrante            First Vice President and Controller of DWSC; 
First Vice President          Assistant Treasurer of Distributors; First Vice 
and Controller                President and Treasurer of DWT.

David Johnson
First Vice President

Stanley Kapica
First Vice President

Robert Zimmerman
First Vice President

                                       8
<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Dale Albright
Vice President

Joan G. Allman
Vice President

Andrew Arbenz
Vice President

Joseph Arcieri                Vice President of various Dean Witter Funds.
Vice President

Maurice Bendrihem
Vice President and
Assistant Controller

Nancy Belza
Vice President

Dale Boettcher
Vice President

Joseph Cardwell
Vice President

Philip Casparius
Vice President

B. Catherine Connelly
Vice President

Salvatore DeSteno             Vice President of DWSC.
Vice President

Bruce Dunn
Vice President

Jeffrey D. Geffen
Vice President

Michael Geringer
Vice President

Stephen Greenhut
Vice President

                                       9
<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Peter W. Gurman
Vice President

Matthew Haynes                Vice President of Dean Witter Variable Investment 
Vice President                Series

Peter Hermann                 Vice President of various Dean Witter Funds 
Vice President

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

Christopher Jones
Vice President

James P. Kastberg
Vice President

Michelle Kaufman              Vice President of various Dean Witter Funds
Vice President

Paula LaCosta                 Vice President of various Dean Witter Funds.
Vice President

Thomas Lawlor
Vice President

Gerard J. Lian                Vice President of various Dean Witter Funds.
Vice President

Catherine Maniscalco          Vice President of Dean Witter Natural Resource 
Vice President                Development Securities Inc.

Albert McGarity
Vice President

LouAnne D. McInnis            Vice President and Assistant Secretary of DWSC; 
Vice President and            Assistant Secretary of the Dean Witter Funds and 
Assistant Secretary           the TCW/DW Funds.

Sharon K. Milligan
Vice President

                                      10
<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS 
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Julie Morrone  
Vice President

Mary Beth Mueller
Vice President

David Myers                   Vice President of Dean Witter Natural Resource 
Vice President                Development Securities Inc.

James Nash
Vice President

Richard Norris
Vice President

Carsten Otto                  Vice President and Assistant Secretary of DWSC; 
Vice President and            Assistant Secretary of the Dean Witter Funds and 
Assistant Secretary           the TCW/DW Funds.

George Paoletti
Vice President

Anne Pickrell                 Vice President of various Dean Witter Funds
Vice President

Michael Roan
Vice President

John Roscoe
Vice President

Hugh Rose
Vice President

Robert Rossetti               Vice President of Dean Witter Precious Metal and 
Vice President                Minerals Trust.

Ruth Rossi                    Vice President and Assistant Secretary of DWSC; 
Vice President and            Assistant Secretary of the Dean Witter Funds and 
Assistant Secretary           the TCW/DW Funds. 

Carl F. Sadler
Vice President

Deborah Santaniello
Vice President

                                      11
<PAGE>

NAME AND POSITION             OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER              OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS 
INTERCAPITAL INC.             AND NATURE OF CONNECTION
- -----------------             ------------------------------------------------

Peter J. Seeley               Vice President of various Dean Witter Funds
Vice President

Naomi Stein
Vice President

Kathleen H. Stromberg         Vice President of various Dean Witter Funds.
Vice President

Marybeth Swisher
Vice President

Robert Vanden Assem
Vice President

James P. Wallin
Vice President

Alice Weiss                   Vice President of various Dean Witter Funds.
Vice President

Item 29.  PRINCIPAL UNDERWRITERS

(a)  Dean Witter Distributors Inc. ("Distributors"), a Delaware corporation, is
     the principal underwriter of the Registrant.  Distributors is also the
     principal underwriter of the following investment companies:

 (1) Dean Witter Liquid Asset Fund Inc.
 (2) Dean Witter Tax-Free Daily Income Trust
 (3) Dean Witter California Tax-Free Daily Income Trust
 (4) Dean Witter Retirement Series
 (5) Dean Witter Dividend Growth Securities Inc.
 (6) Dean Witter Global Asset Allocation
 (7) Dean Witter World Wide Investment Trust
 (8) Dean Witter Capital Growth Securities 
 (9) Dean Witter Convertible Securities Trust
(10) Active Assets Tax-Free Trust
(11) Active Assets Money Trust
(12) Active Assets California Tax-Free Trust
(13) Active Assets Government Securities Trust
(14) Dean Witter Short-Term Bond Fund
(15) Dean Witter Mid-Cap Growth Fund
(16) Dean Witter U.S. Government Securities Trust

                                     


                                      12

<PAGE>

(17) Dean Witter High Yield Securities Inc.
(18) Dean Witter New York Tax-Free Income Fund
(19) Dean Witter Tax-Exempt Securities Trust
(20) Dean Witter California Tax-Free Income Fund
(21) Dean Witter Limited Term Municipal Trust
(22) Dean Witter Natural Resource Development Securities Inc.
(23) Dean Witter World Wide Income Trust
(24) Dean Witter Utilities Fund
(25) Dean Witter Strategist Fund
(26) Dean Witter New York Municipal Money Market Trust
(27) Dean Witter Intermediate Income Securities
(28) Prime Income Trust
(29) Dean Witter European Growth Fund Inc.
(30) Dean Witter Developing Growth Securities Trust
(31) Dean Witter Precious Metals and Minerals Trust
(32) Dean Witter Pacific Growth Fund Inc.
(33) Dean Witter Multi-State Municipal Series Trust
(34) Dean Witter Federal Securities Trust
(35) Dean Witter Short-Term U.S. Treasury Trust
(36) Dean Witter Diversified Income Trust
(37) Dean Witter Health Sciences Trust
(38) Dean Witter Global Dividend Growth Securities
(39) Dean Witter American Value Fund
(40) Dean Witter U.S. Government Money Market Trust
(41) Dean Witter Global Short-Term Income Fund Inc.
(42) Dean Witter Value-Added Market Series
(43) Dean Witter Global Utilities Fund
(44) Dean Witter International SmallCap Fund
(45) Dean Witter Balanced Growth Fund
(46) Dean Witter Balanced Income Fund
(47) Dean Witter Hawaii Municipal Trust
(48) Dean Witter Variable Investment Series   
(49) Dean Witter Capital Appreciation Fund
(50) Dean Witter Intermediate Term U.S. Treasury Trust
(51) Dean Witter Information Fund
(52) Dean Witter Japan Fund
(53) Dean Witter Income Builder Fund
(54) Dean Witter Special Value Fund
(55) Dean Witter Financial Services Trust
(56) Dean Witter Market Leader Trust
(57) Dean Witter S&P 500 Index Fund
(58) Dean Witter Fund of Funds
(59) Morgan Stanley Dean Witter "Competitive Edge" Fund
 (1) TCW/DW Core Equity Trust
 (2) TCW/DW North American Government Income Trust
 (3) TCW/DW Latin American Growth Fund
 (4) TCW/DW Income and Growth Fund
 (5) TCW/DW Small Cap Growth Fund
 (6) TCW/DW Balanced Fund
 (7) TCW/DW Total Return Trust









                                      13

<PAGE>

 (8) TCW/DW Mid-Cap Equity Trust
 (9) TCW/DW Global Telecom Trust 
(10) TCW/DW Strategic Income Trust
(11) TCW/DW Emerging Markets Opportunities Trust

     (b)   The following information is given regarding directors and officers
     of Distributors not listed in Item 28 above.  The principal address of
     Distributors is Two World Trade Center, New York, New York 10048.  None of
     the following persons has any position or office with the Registrant.

     Name                            Positions and Office with Distributors
     ----                            --------------------------------------

     Fredrick K. Kubler              Senior Vice President, Assistant Secretary
                                     and Chief Compliance Officer. 

     Michael T. Gregg                Vice President and Assistant Secretary.

Item 30.  LOCATION OF ACCOUNTS AND RECORDS

     All accounts, books and other documents required to be maintained by
Section 31(a) of the Investment Company Act of 1940 and the Rules thereunder are
maintained by the Investment Manager at its offices, except records relating to
holders of shares issued by the Registrant, which are maintained by the
Registrant's Transfer Agent, at its place of business as shown in the
prospectus.

Item 31.  MANAGEMENT SERVICES

     Registrant is not a party to any such management-related service contract.

Item 32.  UNDERTAKINGS

     Registrant hereby undertakes to furnish each person to whom a prospectus is
delivered with a copy of the Registrant's latest annual report to shareholders,
upon request and without charge.












                                      14
<PAGE>

                                      SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement pursuant to
Rule 485(b) under the Securities Act of 1933 and has duly caused this
Post-Effective Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of New York
and State of New York on the 27th day of February, 1998

                                  DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

                                          By  /s/  Barry Fink
                                            ----------------------------
                                                   Barry Fink
                                            Vice President and Secretary

     Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No.18 has been signed below by the following persons in
the capacities and on the dates indicated.


        SIGNATURES                    TITLE                            DATE
        ----------                    -----                            ----

(1) Principal Executive Officer    President, Chief 
                                   Executive Officer,
                                   Trustee and Chairman
By  /s/ Charles A. Fiumefreddo                                        2/27/98
  ------------------------------
        Charles A. Fiumefreddo

(2) Principal Financial Officer    Treasurer and Principal
                                   Accounting Officer

By  /s/ Thomas F. Caloia                                              2/27/98
  ------------------------------
        Thomas F. Caloia

(3) Majority of the Trustees 

    Charles A. Fiumefreddo (Chairman)
    Philip J. Purcell


By  /s/ Barry Fink                                                    2/27/98
  ------------------------------
        Barry Fink
        Attorney-in-Fact


  Michael Bozic     Manuel H. Johnson
  Edwin J. Garn     Michael E. Nugent
  John R. Haire     John L. Schroeder
  Wayne E. Hedien


By  /s/ David M. Butowsky                                             2/27/98
  ------------------------------
        David M. Butowsky
        Attorney-in-Fact

<PAGE>

                                    EXHIBIT INDEX

      2.     - Amended and Restated By-Laws of the Registrant dated as of
               October 23, 1997.

      5.     - Form of Investment Management Agreement between the Registrant
               and Dean Witter InterCapital Inc.

      6.     - Form of Distribution Agreement between the Registrant and Dean
               Witter Distributors Inc.

      8.     - Form of Transfer Agency and Services Agreement between the 
               Registrant and Dean Witter Trust FSB

     11.    -  Consent of Independent Accountants

     15.    -  Form of Amended and Restated Plan of Distribution Pursuant to
               Rule 12b-1

     16.    -  Schedules for Computation of Performance Quotations 

     27.    -  Financial Data Schedule

  Other.    -  Power of Attorney


<PAGE>
                                   BY-LAWS 

                                      OF 

                 DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

                  AMENDED AND RESTATED AS OF OCTOBER 23, 1997

                                  ARTICLE I 

                                 DEFINITIONS 

   The terms "COMMISSION," "DECLARATION," "DISTRIBUTOR," "INVESTMENT 
ADVISER," "MAJORITY SHAREHOLDER VOTE," "1940 ACT," "SHAREHOLDER," "SHARES," 
"TRANSFER AGENT," "TRUST," "TRUST PROPERTY," and "TRUSTEES" have the 
respective meanings given them in the Declaration of Trust of Trust of Dean 
Witter U.S. Government Money Market Trust (formerly known as Dean 
Witter/Sears U.S. Government Money Market Trust) dated November 18, 1981, as 
amended from time to time.

                                  ARTICLE II 

                                   OFFICES 

   SECTION 2.1. PRINCIPAL OFFICE. Until changed by the Trustees, the 
principal office of the Trust in the Commonwealth of Massachusetts shall be 
in the City of Boston, County of Suffolk. 

   SECTION 2.2. OTHER OFFICES. In addition to its principal office in the 
Commonwealth of Massachusetts, the Trust may have an office or offices in the 
City of New York, State of New York, and at such other places within and 
without the Commonwealth as the Trustees may from time to time designate or 
the business of the Trust may require. 

                                 ARTICLE III 

                            SHAREHOLDERS' MEETINGS 

   SECTION 3.1. PLACE OF MEETINGS. Meetings of Shareholders shall be held at 
such place, within or without the Commonwealth of Massachusetts, as may be 
designated from time to time by the Trustees. 

   SECTION 3.2. MEETINGS. Meetings of Shareholders of the Trust shall be held 
whenever called by the Trustees or the President of the Trust and whenever 
election of a Trustee or Trustees by Shareholders is required by the 
provisions of Section 16(a) of the 1940 Act, for that purpose. Special 
meetings of Shareholders shall also be called by the Secretary upon the 
written request of the holders of Shares entitled to vote not less than 
twenty-five percent (25%) of all votes entitled to be cast at such meeting, 
except to the extent otherwise required by Section 16(c) of the 1940 Act, as 
made applicable to the Trust by the provisions of Section 2.3 of the 
Declaration. Such request shall state the purpose or purposes of such meeting 
and the matters proposed to be acted on thereat. Except to the extent 
otherwise required by Section 16(c) of the 1940 Act, as made applicable to 
the Trust by the provisions of Section 2.3 of the Declaration, the Secretary 
shall inform such Shareholders of the reasonable estimated cost of preparing 
and mailing such notice of the meeting, and upon payment to the Trust of such 
costs, the Secretary shall give notice stating the purpose or purposes of the 
meeting to all entitled to vote at such meeting. No meeting need be called 
upon the request of the holders of Shares entitled to cast less than a 
majority of all votes entitled to be cast at such meeting, to consider any 
matter which is substantially the same as a matter voted upon at any meeting 
of Shareholders held during the preceding twelve months. 

   SECTION 3.3. NOTICE OF MEETINGS. Written or printed notice of every 
Shareholders' meeting stating the place, date, and purpose or purposes 
thereof, shall be given by the Secretary not less than ten (10) nor more than 
ninety (90) days before such meeting to each Shareholder entitled to vote at 
such meeting. Such notice shall be deemed to be given when deposited in the 
United States mail, postage prepaid, directed to the Shareholder at his 
address as it appears on the records of the Trust. 

   SECTION 3.4. QUORUM AND ADJOURNMENT OF MEETINGS. Except as otherwise 
provided by law, by the Declaration or by these By-Laws, at all meetings of 
Shareholders, the holders of a majority of the Shares issued and outstanding 
and entitled to vote thereat, present in person or represented by proxy, 
shall be 

<PAGE>

requisite and shall constitute a quorum for the transaction of business. In 
the absence of a quorum, the Shareholders present or represented by proxy and 
entitled to vote thereat shall have the power to adjourn the meeting from 
time to time. The Shareholders present in person or represented by proxy at 
any meeting and entitled to vote thereat also shall have the power to adjourn 
the meeting from time to time if the vote required to approve or reject any 
proposal described in the original notice of such meeting is not obtained 
(with proxies being voted for or against adjournment consistent with the 
votes for and against the proposal for which the required vote has not been 
obtained). The affirmative vote of the holders of a majority of the Shares 
then present in person or represented by proxy shall be required to adjourn 
any meeting. Any adjourned meeting may be reconvened without further notice 
or change in record date. At any reconvened meeting at which a quorum shall 
be present, any business may be transacted that might have been transacted at 
the meeting as originally called. 

   SECTION 3.5. VOTING RIGHTS, PROXIES. At each meeting of Shareholders, each 
holder of record of Shares entitled to vote thereat shall be entitled to one 
vote in person or by proxy, executed in writing by the Shareholder or his 
duly authorized attorney-in-fact, for each Share of beneficial interest of 
the Trust and for the fractional portion of one vote for each fractional 
Share entitled to vote so registered in his name on the records of the Trust 
on the date fixed as the record date for the determination of Shareholders 
entitled to vote at such meeting. No proxy shall be valid after eleven months 
from its date, unless otherwise provided in the proxy. At all meetings of 
Shareholders, unless the voting is conducted by inspectors, all questions 
relating to the qualification of voters and the validity of proxies and the 
acceptance or rejection of votes shall be decided by the chairman of the 
meeting. Pursuant to a resolution of a majority of the Trustees, proxies may 
be solicited in the name of one or more Trustees or Officers of the Trust. 

   SECTION 3.6. VOTE REQUIRED. Except as otherwise provided by law, by the 
Declaration of Trust, or by these By-Laws, at each meeting of Shareholders at 
which a quorum is present, all matters shall be decided by Majority 
Shareholder Vote. 

   SECTION 3.7. INSPECTORS OF ELECTION. In advance of any meeting of 
Shareholders, the Trustees may appoint Inspectors of Election to act at the 
meeting or any adjournment thereof. If Inspectors of Election are not so 
appointed, the chairman of any meeting of Shareholders may, and on the 
request of any Shareholder or his proxy shall, appoint Inspectors of Election 
of the meeting. In case any person appointed as Inspector fails to appear or 
fails or refuses to act, the vacancy may be filled by appointment made by the 
Trustees in advance of the convening of the meeting or at the meeting by the 
person acting as chairman. The Inspectors of Election shall determine the 
number of Shares outstanding, the Shares represented at the meeting, the 
existence of a quorum, the authenticity, validity and effect of proxies, 
shall receive votes, ballots or consents, shall hear and determine all 
challenges and questions in any way arising in connection with the right to 
vote, shall count and tabulate all votes or consents, determine the results, 
and do such other acts as may be proper to conduct the election or vote with 
fairness to all Shareholders. On request of the chairman of the meeting, or 
of any Shareholder or his proxy, the Inspectors of Election shall make a 
report in writing of any challenge or question or matter determined by them 
and shall execute a certificate of any facts found by them. 

   SECTION 3.8. INSPECTION OF BOOKS AND RECORDS. Shareholders shall have such 
rights and procedures of inspection of the books and records of the Trust as 
are granted to Shareholders under the laws of the Commonwealth of 
Massachusetts. 

   SECTION 3.9. ACTION BY SHAREHOLDERS WITHOUT MEETING. Except as otherwise 
provided by law, the provisions of these By-Laws relating to notices and 
meetings to the contrary notwithstanding, any action required or permitted to 
be taken at any meeting of Shareholders may be taken without a meeting if a 
majority of the Shareholders entitled to vote upon the action consent to the 
action in writing and such consents are filed with the records of the Trust. 
Such consent shall be treated for all purposes as a vote taken at a meeting 
of Shareholders. 

   SECTION 3.10. PRESENCE AT MEETINGS. Presence at meetings of shareholders 
requires physical attendance by the shareholder or his or her proxy at the 
meeting site and does not encompass attendance by telephonic or other 
electronic means. 


                                       2
<PAGE>
                                  ARTICLE IV 

                                   TRUSTEES 

   SECTION 4.1. MEETINGS OF THE TRUSTEES. The Trustees may in their 
discretion provide for regular or special meetings of the Trustees. Regular 
meetings of the Trustees may be held at such time and place as shall be 
determined from time to time by the Trustees without further notice. Special 
meetings of the Trustees may be called at any time by the President and shall 
be called by the President or the Secretary upon the written request of any 
two (2) Trustees. 

   SECTION 4.2. NOTICE OF SPECIAL MEETINGS. Written notice of special 
meetings of the Trustees, stating the place, date and time thereof, shall be 
given not less than two (2) days before such meeting to each Trustee, 
personally, by telegram, by mail, or by leaving such notice at his place of 
residence or usual place of business. If mailed, such notice shall be deemed 
to be given when deposited in the United States mail, postage prepaid, 
directed to the Trustee at his address as it appears on the records of the 
Trust. Subject to the provisions of the 1940 Act, notice or waiver of notice 
need not specify the purpose of any special meeting. 

   SECTION 4.3. TELEPHONE MEETINGS. Subject to the provisions of the 1940 
Act, any Trustee, or any member or members of any committee designated by the 
Trustees, may participate in a meeting of the Trustees, or any such 
committee, as the case may be, by means of a conference telephone or similar 
communications equipment if all persons participating in the meeting can hear 
each other at the same time. Participation in a meeting by these means 
constitutes presence in person at the meeting. 

   SECTION 4.4. QUORUM, VOTING AND ADJOURNMENT OF MEETINGS. At all meetings 
of the Trustees, a majority of the Trustees shall be requisite to and shall 
constitute a quorum for the transaction of business. If a quorum is present, 
the affirmative vote of a majority of the Trustees present shall be the act 
of the Trustees, unless the concurrence of a greater proportion is expressly 
required for such action by law, the Declaration or these By-Laws. If at any 
meeting of the Trustees there be less than a quorum present, the Trustees 
present thereat may adjourn the meeting from time to time, without notice 
other than announcement at the meeting, until a quorum shall have been 
obtained. 

   SECTION 4.5. ACTION BY TRUSTEES WITHOUT MEETING. The provisions of these 
By-Laws covering notices and meetings to the contrary notwithstanding, and 
except as required by law, any action required or permitted to be taken at 
any meeting of the Trustees may be taken without a meeting if a consent in 
writing setting forth the action shall be signed by all of the Trustees 
entitled to vote upon the action and such written consent is filed with the 
minutes of proceedings of the Trustees. 

   SECTION 4.6. EXPENSES AND FEES. Each Trustee may be allowed expenses, if 
any, for attendance at each regular or special meeting of the Trustees, and 
each Trustee who is not an officer or employee of the Trust or of its 
investment manager or underwriter or of any corporate affiliate of any of 
said persons shall receive for services rendered as a Trustee of the Trust 
such compensation as may be fixed by the Trustees. Nothing herein contained 
shall be construed to preclude any Trustee from serving the Trust in any 
other capacity and receiving compensation therefor. 

   SECTION 4.7.  EXECUTION OF INSTRUMENTS AND DOCUMENTS AND SIGNING OF CHECKS 
AND OTHER OBLIGATIONS AND TRANSFERS. All instruments, documents and other 
papers shall be executed in the name and on behalf of the Trust and all 
checks, notes, drafts and other obligations for the payment of money by the 
Trust shall be signed, and all transfer of securities standing in the name of 
the Trust shall be executed, by the Chairman, the President, any Vice 
President or the Treasurer or by any one or more officers or agents of the 
Trust as shall be designated for that purpose by vote of the Trustees; 
notwithstanding the above, nothing in this Section 4.7 shall be deemed to 
preclude the electronic authorization, by designated persons, of the Trust's 
Custodian (as described herein in Section 9.1) to transfer assets of the 
Trust, as provided for herein in Section 9.1. 

   SECTION 4.8. INDEMNIFICATION OF TRUSTEES, OFFICERS, EMPLOYEES AND 
AGENTS. (a) The Trust shall indemnify any person who was or is a party or is 
threatened to be made a party to any threatened, pending, or completed 
action, suit or proceeding, whether civil, criminal, administrative or 
investigative 
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<PAGE>
(other than an action by or in the right of the Trust) by reason of the fact 
that he is or was a Trustee, officer, employee, or agent of the Trust. The 
indemnification shall be against expenses, including attorneys' fees, 
judgments, fines, and amounts paid in settlement, actually and reasonably 
incurred by him in connection with the action, suit, or proceeding, if he 
acted in good faith and in a manner he reasonably believed to be in or not 
opposed to the best interests of the Trust, and, with respect to any criminal 
action or proceeding, had no reasonable cause to believe his conduct was 
unlawful. The termination of any action, suit or proceeding by judgment, 
order, settlement, conviction, or upon a plea of nolo contendere or its 
equivalent, shall not, of itself, create a presumption that the person did 
not act in good faith and in a manner which he reasonably believed to be in 
or not opposed to the best interests of the Trust, and, with respect to any 
criminal action or proceeding, had reasonable cause to believe that his 
conduct was unlawful. 

   (b) The Trust shall indemnify any person who was or is a party or is 
threatened to be made a party to any threatened, pending or completed action 
or suit by or on behalf of the Trust to obtain a judgment or decree in its 
favor by reason of the fact that he is or was a Trustee, officer, employee, 
or agent of the Trust. The indemnification shall be against expenses, 
including attorneys' fees actually and reasonably incurred by him in 
connection with the defense or settlement of the action or suit, if he acted 
in good faith and in a manner he reasonably believed to be in or not opposed 
to the best interests of the Trust; except that no indemnification shall be 
made in respect of any claim, issue, or matter as to which the person has 
been adjudged to be liable for negligence or misconduct in the performance of 
his duty to the Trust, except to the extent that the court in which the 
action or suit was brought, or a court of equity in the county in which the 
Trust has its principal office, determines upon application that, despite the 
adjudication of liability but in view of all circumstances of the case, the 
person is fairly and reasonably entitled to indemnity for those expenses 
which the court shall deem proper, provided such Trustee, officer, employee 
or agent is not adjudged to be liable by reason of his willful misfeasance, 
bad faith, gross negligence or reckless disregard of the duties involved in 
the conduct of his office. 

   (c) To the extent that a Trustee, officer, employee, or agent of the Trust 
has been successful on the merits or otherwise in defense of any action, suit 
or proceeding referred to in subsection (a) or (b) or in defense of any 
claim, issue or matter therein, he shall be indemnified against expenses, 
including attorneys' fees, actually and reasonably incurred by him in 
connection therewith. 

   (d) (1) Unless a court orders otherwise, any indemnification under 
subsections (a) or (b) of this section may be made by the Trust only as 
authorized in the specific case after a determination that indemnification of 
the Trustee, officer, employee, or agent is proper in the circumstances 
because he has met the applicable standard of conduct set forth in 
subsections (a) or (b). 

       (2) The determination shall be made: 

           (i) By the Trustees, by a majority vote of a quorum which consists of
    Trustees who were not parties to the action, suit or proceeding; or

          (ii) If the required quorum is not obtainable, or if a quorum of
    disinterested Trustees so directs, by independent legal counsel in a 
    written opinion; or 

         (iii) By the Shareholders. 

       (3) Notwithstanding any provision of this Section 4.8, no person shall 
    be entitled to indemnification for any liability, whether or not there is 
    an adjudication of liability, arising by reason of willful misfeasance, 
    bad faith, gross negligence, or reckless disregard of duties as described 
    in Section 17(h) and (i) of the Investment Company Act of 1940 
    ("disabling conduct"). A person shall be deemed not liable by reason of 
    disabling conduct if, either: 

           (i) a final decision on the merits is made by a court or other body
    before whom the proceeding was brought that the person to be indemnified
    ("indemnitee") was not liable by reason of disabling conduct; or 

          (ii) in the absence of such a decision, a reasonable determination,
    based upon a review of the facts, that the indemnitee was not liable by 
    reason of disabling conduct, is made by either--
 
                                       4
<PAGE>

          (A) a majority of a quorum of Trustees who are neither "interested 
         persons" of the Trust, as defined in Section 2(a)(19) of the 
         Investment Company Act of 1940, nor parties to the action, suit or 
         proceeding, or 

          (B) an independent legal counsel in a written opinion. 

   (e) Expenses, including attorneys' fees, incurred by a Trustee, officer, 
employee or agent of the Trust in defending a civil or criminal action, suit 
or proceeding may be paid by the Trust in advance of the final disposition 
thereof if: 

        (1) authorized in the specific case by the Trustees; and 

        (2) the Trust receives an undertaking by or on behalf of the Trustee, 
    officer, employee or agent of the Trust to repay the advance if it is not 
    ultimately determined that such person is entitled to be indemnified by 
    the Trust; and 

        (3) either, (i) such person provides a security for his undertaking, 
    or 

           (ii) the Trust is insured against losses by reason of any lawful 
         advances, or 

          (iii) a determination, based on a review of readily available 
         facts, that there is reason to believe that such person ultimately 
         will be found entitled to indemnification, is made by either-- 

              (A) a majority of a quorum which consists of Trustees who are 
             neither "interested persons" of the Trust, as defined in Section 
             2(a)(19) of the 1940 Act, nor parties to the action, suit or 
             proceeding, or 

              (B) an independent legal counsel in a written opinion. 

   (f) The indemnification provided by this Section shall not be deemed 
exclusive of any other rights to which a person may be entitled under any 
by-law, agreement, vote of Shareholders or disinterested Trustees or 
otherwise, both as to action in his official capacity and as to action in 
another capacity while holding the office, and shall continue as to a person 
who has ceased to be a Trustee, officer, employee, or agent and inure to the 
benefit of the heirs, executors and administrators of such person; provided 
that no person may satisfy any right of indemnity or reimbursement granted 
herein or to which he may be otherwise entitled except out of the property of 
the Trust, and no Shareholder shall be personally liable with respect to any 
claim for indemnity or reimbursement or otherwise. 

   (g) The Trust may purchase and maintain insurance on behalf of any person 
who is or was a Trustee, officer, employee, or agent of the Trust, against 
any liability asserted against him and incurred by him in any such capacity, 
or arising out of his status as such. However, in no event will the Trust 
purchase insurance to indemnify any officer or Trustee against liability for 
any act for which the Trust itself is not permitted to indemnify him. 

   (h) Nothing contained in this Section shall be construed to protect any 
Trustee or officer of the Trust against any liability to the Trust or to its 
security holders to which he would otherwise be subject by reason of willful 
misfeasance, bad faith, gross negligence or reckless disregard of the duties 
involved in the conduct of his office. 

                                  ARTICLE V 

                                  COMMITTEES 

   SECTION 5.1. EXECUTIVE AND OTHER COMMITTEEs. The Trustees, by resolution 
adopted by a majority of the Trustees, may designate an Executive Committee 
and/or committees, each committee to consist of two (2) or more of the 
Trustees of the Trust and may delegate to such committees, in the intervals 
between meetings of the Trustees, any or all of the powers of the Trustees in 
the management of the business and affairs of the Trust. In the absence of 
any member of any such committee, the members thereof present at any meeting, 
whether or not they constitute a quorum, may appoint a Trustee to act in 
place of such absent member. Each such committee shall keep a record of its 
proceedings. 


                                       5
<PAGE>

   The Executive Committee and any other committee shall fix its own rules or 
procedure, but the presence of at least fifty percent (50%) of the members of 
the whole committee shall in each case be necessary to constitute a quorum of 
the committee and the affirmative vote of the majority of the members of the 
committee present at the meeting shall be necessary to take action. 

   All actions of the Executive Committee shall be reported to the Trustees 
at the meeting thereof next succeeding to the taking of such action. 

   SECTION 5.2. ADVISORY COMMITTEE. The Trustees may appoint an advisory 
committee which shall be composed of persons who do not serve the Trust in 
any other capacity and which shall have advisory functions with respect to 
the investments of the Trust but which shall have no power to determine that 
any security or other investment shall be purchased, sold or otherwise 
disposed of by the Trust. The number of persons constituting any such 
advisory committee shall be determined from time to time by the Trustees. The 
members of any such advisory committee may receive compensation for their 
services and may be allowed such fees and expenses for the attendance at 
meetings as the Trustees may from time to time determine to be appropriate. 

   SECTION 5.3. COMMITTEE ACTION WITHOUT MEETING. The provisions of these 
By-Laws covering notices and meetings to the contrary notwithstanding, and 
except as required by law, any action required or permitted to be taken at 
any meeting of any Committee of the Trustees appointed pursuant to Section 
5.1 of these By-Laws may be taken without a meeting if a consent in writing 
setting forth the action shall be signed by all members of the Committee 
entitled to vote upon the action and such written consent is filed with the 
records of the proceedings of the Committee. 

                                  ARTICLE VI 

                                   OFFICERS 

   SECTION 6.1. EXECUTIVE OFFICERS. The executive officers of the Trust shall 
be a Chairman, a President, one or more Vice Presidents, a Secretary and a 
Treasurer. The Chairman shall be selected from among the Trustees but none of 
the other executive officers need be a Trustee. Two or more offices, except 
those of President and any Vice President, may be held by the same person, 
but no officer shall execute, acknowledge or verify any instrument in more 
than one capacity. The executive officers of the Trust shall be elected 
annually by the Trustees and each executive officer so elected shall hold 
office until his successor is elected and has qualified. 

   SECTION 6.2. OTHER OFFICERS AND AGENTS. The Trustees may also elect one or 
more Assistant Vice Presidents, Assistant Secretaries and Assistant 
Treasurers and may elect, or may delegate to the President the power to 
appoint, such other officers and agents as the Trustees shall at any time or 
from time to time deem advisable. 

   SECTION 6.3. TERM AND REMOVAL AND VACANCIES. Each officer of the Trust 
shall hold office until his successor is elected and has qualified. Any 
officer or agent of the Trust may be removed by the Trustees whenever, in 
their judgment, the best interests of the Trust will be served thereby, but 
such removal shall be without prejudice to the contractual rights, if any, of 
the person so removed. 

   SECTION 6.4. COMPENSATION OF OFFICERS. The compensation of officers and 
agents of the Trust shall be fixed by the Trustees, or by the President to 
the extent provided by the Trustees with respect to officers appointed by the 
President. 

   SECTION 6.5. POWER AND DUTIES. All officers and agents of the Trust, as 
between themselves and the Trust, shall have such authority and perform such 
duties in the management of the Trust as may be provided in or pursuant to 
these By-Laws, or to the extent not so provided, as may be prescribed by the 
Trustees; provided, that no rights of any third party shall be affected or 
impaired by any such By-Law or resolution of the Trustees unless he has 
knowledge thereof. 

   SECTION 6.6. THE CHAIRMAN OF THE BOARD. The Chairman shall preside at all 
meetings of the Shareholders and of the Trustees, he shall be a signatory on 
all Annual and Semi-Annual Reports as may be sent to shareholders, and he 
shall perform such other duties as the Trustees may from time to time 
prescribe. 

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<PAGE>

   SECTION 6.7. THE PRESIDENT.  (a) The President shall be the chief 
executive officer of the Trust; he shall have general and active management 
of the business of the Trust, shall see that all orders and resolutions of 
the Board of Trustees are carried into effect, and, in connection therewith, 
shall be authorized to delegate to one or more Vice Presidents such of his 
powers and duties at such times and in such manner as he may deem advisable. 

   (b) In the absence of the Chairman, the President shall preside at all 
meetings of the shareholders and the Board of Trustees; and he shall perform 
such other duties as the Board of Trustees may from time to time prescribe. 

   SECTION 6.8. THE VICE PRESIDENTS. The Vice Presidents shall be of such 
number and shall have such titles as may be determined from time to time by 
the Trustees. The Vice President, or, if there be more than one, the Vice 
Presidents in the order of their seniority as may be determined from time to 
time by the Trustees or the President, shall, in the absence or disability of 
the President, exercise the powers and perform the duties of the President, 
and he or they shall perform such other duties as the Trustees or the 
President may from time to time prescribe. 

   SECTION 6.9. THE ASSISTANT VICE PRESIDENTS. The Assistant Vice President, 
or, if there be more than one, the Assistant Vice Presidents, shall perform 
such duties and have such powers as may be assigned them from time to time by 
the Trustees or the President. 

   SECTION 6.10. THE SECRETARY. The Secretary shall attend all meetings of 
the Trustees and all meetings of the Shareholders and record all the 
proceedings of the meetings of the Shareholders and of the Trustees in a book 
to be kept for that purpose, and shall perform like duties for the standing 
committees when required. He shall give, or cause to be given, notice of all 
meetings of the Shareholders and special meetings of the Trustees, and shall 
perform such other duties and have such powers as the Trustees, or the 
President, may from time to time prescribe. He shall keep in safe custody the 
seal of the Trust and affix or cause the same to be affixed to any instrument 
requiring it, and, when so affixed, it shall be attested by his signature or 
by the signature of an Assistant Secretary. 

   SECTION 6.11. THE ASSISTANT SECRETARIES. The Assistant Secretary, or, if 
there be more than one, the Assistant Secretaries in the order determined by 
the Trustees or the President, shall, in the absence or disability of the 
Secretary, perform the duties and exercise the powers of the Secretary and 
shall perform such duties and have such other powers as the Trustees or the 
President may from time to time prescribe. 

   SECTION 6.12. THE TREASURER. The Treasurer shall be the chief financial 
officer of the Trust. He shall keep or cause to be kept full and accurate 
accounts of receipts and disbursements in books belonging to the Trust, and 
he shall render to the Trustees and the President, whenever any of them 
require it, an account of his transactions as Treasurer and of the financial 
condition of the Trust; and he shall perform such other duties as the 
Trustees, or the President, may from time to time prescribe. 

   SECTION 6.13. THE ASSISTANT TREASURERS. The Assistant Treasurer, or, if 
there shall be more than one, the Assistant Treasurers in the order 
determined by the Trustees or the President, shall, in the absence or 
disability of the Treasurer, perform the duties and exercise the powers of 
the Treasurer and shall perform such other duties and have such other powers 
as the Trustees, or the President, may from time to time prescribe. 

   SECTION 6.14. DELEGATION OF DUTIES. Whenever an officer is absent or 
disabled, or whenever for any reason the Trustees may deem it desirable, the 
Trustees may delegate the powers and duties of an officer or officers to any 
other officer or officers or to any Trustee or Trustees. 

                                 ARTICLE VII 

                         DIVIDENDS AND DISTRIBUTIONS 

   Subject to any applicable provisions of law and the Declaration, dividends 
and distributions upon the Shares may be declared at such intervals as the 
Trustees may determine, in cash, in securities or other property, or in 
Shares, from any sources permitted by law, all as the Trustees shall from 
time to time determine. 


                                       7
<PAGE>

   Inasmuch as the computation of net income and net profits from the sales 
of securities or other properties for federal income tax purposes may vary 
from the computation thereof on the records of the Trust, the Trustees shall 
have power, in their discretion, to distribute as income dividends and as 
capital gain distributions, respectively, amounts sufficient to enable the 
Trust to avoid or reduce liability for federal income taxes. 

                                 ARTICLE VIII
 
                            CERTIFICATES OF SHARES 

   SECTION 8.1. CERTIFICATES OF SHARES. Certificates for Shares of each 
series or class of Shares shall be in such form and of such design as the 
Trustees shall approve, subject to the right of the Trustees to change such 
form and design at any time or from time to time, and shall be entered in the 
records of the Trust as they are issued. Each such certificate shall bear a 
distinguishing number; shall exhibit the holder's name and certify the number 
of full Shares owned by such holder; shall be signed by or in the name of the 
Trust by the President, or a Vice President, and countersigned by the 
Secretary or an Assistant Secretary or the Treasurer and an Assistant 
Treasurer of the Trust; shall be sealed with the seal; and shall contain such 
recitals as may be required by law. Where any certificate is signed by a 
Transfer Agent or by a Registrar, the signature of such officers and the seal 
may be facsimile, printed or engraved. The Trust may, at its option, 
determine not to issue a certificate or certificates to evidence Shares owned 
of record by any Shareholder. 

   In case any officer or officers who shall have signed, or whose facsimile 
signature or signatures shall appear on, any such certificate or certificates 
shall cease to be such officer or officers of the Trust, whether because of 
death, resignation or otherwise, before such certificate or certificates 
shall have been delivered by the Trust, such certificate or certificates 
shall, nevertheless, be adopted by the Trust and be issued and delivered as 
though the person or persons who signed such certificate or certificates or 
whose facsimile signature or signatures shall appear therein had not ceased 
to be such officer or officers of the Trust. 

   No certificate shall be issued for any share until such share is fully 
paid. 

   SECTION 8.2. LOST, STOLEN, DESTROYED AND MUTILATED CERTIFICATES. The 
Trustees may direct a new certificate or certificates to be issued in place 
of any certificate or certificates theretofore issued by the Trust alleged to 
have been lost, stolen or destroyed, upon satisfactory proof of such loss, 
theft, or destruction; and the Trustees may, in their discretion, require the 
owner of the lost, stolen or destroyed certificate, or his legal 
representative, to give to the Trust and to such Registrar, Transfer Agent 
and/or Transfer Clerk as may be authorized or required to countersign such 
new certificate or certificates, a bond in such sum and of such type as they 
may direct, and with such surety or sureties, as they may direct, as 
indemnity against any claim that may be against them or any of them on 
account of or in connection with the alleged loss, theft or destruction of 
any such certificate. 

                                  ARTICLE IX 

                                  CUSTODIAN 

   SECTION 9.1. APPOINTMENT AND DUTIES. The Trust shall at times employ a 
bank or trust company having capital, surplus and undivided profits of at 
least five million dollars ($5,000,000) as custodian with authority as its 
agent, but subject to such restrictions, limitations and other requirements, 
if any, as may be contained in these By-Laws and the 1940 Act: 

     (1) to receive and hold the securities owned by the Trust and deliver 
    the same upon written or electronically transmitted order; 

     (2) to receive and receipt for any moneys due to the Trust and deposit 
    the same in its own banking department or elsewhere as the Trustees may 
    direct; 

     (3) to disburse such funds upon orders or vouchers; 


                                       8
<PAGE>

all upon such basis of compensation as may be agreed upon between the 
Trustees and the custodian. If so directed by a Majority Shareholder Vote, 
the custodian shall deliver and pay over all property of the Trust held by it 
as specified in such vote. 

   The Trustees may also authorize the custodian to employ one or more 
sub-custodians from time to time to perform such of the acts and services of 
the custodian and upon such terms and conditions as may be agreed upon 
between the custodian and such sub-custodian and approved by the Trustees. 

   SECTION 9.2. CENTRAL CERTIFICATE SYSTEM. Subject to such rules, 
regulations and orders as the Commission may adopt, the Trustees may direct 
the custodian to deposit all or any part of the securities owned by the Trust 
in a system for the central handling of securities established by a national 
securities exchange or a national securities association registered with the 
Commission under the Securities Exchange Act of 1934, or such other person as 
may be permitted by the Commission, or otherwise in accordance with the 1940 
Act, pursuant to which system all securities of any particular class or 
series of any issuer deposited within the system are treated as fungible and 
may be transferred or pledged by bookkeeping entry without physical delivery 
of such securities, provided that all such deposits shall be subject to 
withdrawal only upon the order of the Trust. 

                                  ARTICLE X 

                               WAIVER OF NOTICE 

   Whenever any notice of the time, place or purpose of any meeting of 
Shareholders, Trustees, or of any committee is required to be given in 
accordance with law or under the provisions of the Declaration or these 
By-Laws, a waiver thereof in writing, signed by the person or persons 
entitled to such notice and filed with the records of the meeting, whether 
before or after the holding thereof, or actual attendance at the meeting of 
shareholders, Trustees or committee, as the case may be, in person, shall be 
deemed equivalent to the giving of such notice to such person. 

                                  ARTICLE XI 

                                MISCELLANEOUS 

   SECTION 11.1. LOCATION OF BOOKS AND RECORDS. The books and records of the 
Trust may be kept outside the Commonwealth of Massachusetts at such place or 
places as the Trustees may from time to time determine, except as otherwise 
required by law. 

   SECTION 11.2. RECORD DATE. The Trustees may fix in advance a date as the 
record date for the purpose of determining the Shareholders entitled to (i) 
receive notice of, or to vote at, any meeting of Shareholders, or (ii) 
receive payment of any dividend or the allotment of any rights, or in order 
to make a determination of Shareholders for any other proper purpose. The 
record date, in any case, shall not be more than one hundred eighty (180) 
days, and in the case of a meeting of Shareholders not less than ten (10) 
days, prior to the date on which such meeting is to be held or the date on 
which such other particular action requiring determination of Shareholders is 
to be taken, as the case may be. In the case of a meeting of Shareholders, 
the meeting date set forth in the notice to Shareholders accompanying the 
proxy statement shall be the date used for purposes of calculating the 180 
day or 10 day period, and any adjourned meeting may be reconvened without a 
change in record date. In lieu of fixing a record date, the Trustees may 
provide that the transfer books shall be closed for a stated period but not 
to exceed, in any case, twenty (20) days. If the transfer books are closed 
for the purpose of determining Shareholders entitled to notice of a vote at a 
meeting of Shareholders, such books shall be closed for at least ten (10) 
days immediately preceding the meeting. 

   SECTION 11.3. SEAL. The Trustees shall adopt a seal, which shall be in 
such form and shall have such inscription thereon as the Trustees may from 
time to time provide. The seal of the Trust may be affixed to any document, 
and the seal and its attestation may be lithographed, engraved or otherwise


                                       9
<PAGE>

printed on any document with the same force and effect as if it had been 
imprinted and attested manually in the same manner and with the same effect 
as if done by a Massachusetts business corporation under Massachusetts law. 

   SECTION 11.4. FISCAL YEAR. The fiscal year of the Trust shall end on such 
date as the Trustees may by resolution specify, and the Trustees may by 
resolution change such date for future fiscal years at any time and from time 
to time. 

   SECTION 11.5. ORDERS FOR PAYMENT OF MONEY. All orders or instructions for 
the payment of money of the Trust, and all notes or other evidences of 
indebtedness issued in the name of the Trust, shall be signed by such officer 
or officers or such other person or persons as the Trustees may from time to 
time designate, or as may be specified in or pursuant to the agreement 
between the Trust and the bank or trust company appointed as Custodian of the 
securities and funds of the Trust. 

                                 ARTICLE XII 

                     COMPLIANCE WITH FEDERAL REGULATIONS 

   The Trustees are hereby empowered to take such action as they may deem to 
be necessary, desirable or appropriate so that the Trust is or shall be in 
compliance with any federal or state statute, rule or regulation with which 
compliance by the Trust is required. 

                                 ARTICLE XIII 

                                  AMENDMENTS 

   These By-Laws may be amended, altered, or repealed, or new By-Laws may be 
adopted, (a) by a Majority Shareholder Vote, or (b) by the Trustees; 
provided, however, that no By-Law may be amended, adopted or repealed by the 
Trustees if such amendment, adoption or repeal requires, pursuant to law, the 
Declaration, or these By-Laws, a vote of the Shareholders. The Trustees shall 
in no event adopt By-Laws which are in conflict with the Declaration, and any 
apparent inconsistency shall be construed in favor of the related provisions 
in the Declaration. 

                                 ARTICLE XIV 

                             DECLARATION OF TRUST 

   The Declaration of Trust establishing Dean Witter U.S. Government Money 
Market Trust, dated November 18, 1981, together with all amendments thereto, 
a copy of which is on file in the office of the Secretary of the Commonwealth 
of Massachusetts, provides that the name Dean Witter U.S. Government Money 
Market Trust refers to the Trustees under the Declaration collectively as 
Trustees, but not as individuals or personally; and no Trustee, Shareholder, 
officer, employee or agent of Dean Witter U.S. Government Money Market Trust 
shall be held to any personal liability, nor shall resort be had to their 
private property for the satisfaction of any obligation or claim or 
otherwise, in connection with the affairs of said Dean Witter U.S. Government 
Money Market Trust, but the Trust Estate only shall be liable.


                                       10

<PAGE>
                        INVESTMENT MANAGEMENT AGREEMENT

    AGREEMENT made as of the 31st day of May, 1997 by and between Dean Witter
U.S. Government Money Market Trust, an unincorporated business trust organized
under the laws of the Commonwealth of Massachusetts (hereinafter called the
"Fund"), and Dean Witter InterCapital Inc., a Delaware corporation (hereinafter
called the "Investment Manager"):

    WHEREAS, The Fund is engaged in business as an open-end management
investment company and is registered as such under the Investment Company Act of
1940, as amended (the "Act"); and
 
    WHEREAS, The Investment Manager is registered as an investment adviser under
the Investment Advisers Act of 1940, and engages in the business of acting as
investment adviser; and
 
    WHEREAS, The Fund desires to retain the Investment Manager to render
management and investment advisory services in the manner and on the terms and
conditions hereinafter set forth; and
 
    WHEREAS, The Investment Manager desires to be retained to perform services
on said terms and conditions:
 
    Now, Therefore, this Agreement
 
                              W I T N E S S E T H:
 
that in consideration of the premises and the mutual covenants hereinafter
contained, the Fund and the Investment Manager agree as follows:
 
          1. The Fund hereby retains the Investment Manager to act as 
investment manager of the Fund and, subject to the supervision of the 
Trustees, to supervise the investment activities of the Fund as hereinafter 
set forth. Without limiting the generality of the foregoing, the Investment 
Manager shall obtain and evaluate such information and advice relating to the 
economy, securities markets and securities as it deems necessary or useful to 
discharge its duties hereunder; shall continuously manage the assets of the 
Fund in a manner consistent with the investment objectives and policies of 
the Fund; shall determine the securities to be purchased, sold or otherwise 
disposed of by the Fund and the timing of such purchases, sales and 
dispositions; and shall take such further action, including the placing of 
purchase and sale orders on behalf of the Fund, as the Investment Manager 
shall deem necessary or appropriate. The Investment Manager shall also 
furnish to or place at the disposal of the Fund such of the information, 
evaluations, analyses and opinions formulated or obtained by the Investment 
Manager in the discharge of its duties as the Fund may, from time to time, 
reasonably request.
 
          2. The Investment Manager shall, at its own expense, maintain such 
staff and employ or retain such personnel and consult with such other persons 
as it shall from time to time determine to be necessary or useful to the 
performance of its obligations under this Agreement. Without limiting the 
generality of the foregoing, the staff and personnel of the Investment 
Manager shall be deemed to include persons employed or otherwise retained by 
the Investment Manager to furnish statistical and other factual data, advice 
regarding economic factors and trends, information with respect to technical 
and scientific developments, and such other information, advice and 
assistance as the Investment Manager may desire. The Investment Manager 
shall, as agent for the Fund, maintain the Fund's records and books of 
account (other than those maintained by the Fund's transfer agent, registrar, 
custodian and other agents). All such books and records so maintained shall 
be the property of the Fund and, upon request therefor, the Investment 
Manager shall surrender to the Fund such of the books and records so 
requested.
 
          3. The Fund will, from time to time, furnish or otherwise make 
available to the Investment Manager such financial reports, proxy statements 
and other information relating to the business and affairs of the Fund as the 
Investment Manager may reasonably require in order to discharge its duties 
and obligations hereunder.
 
          4. The Investment Manager shall bear the cost of rendering the 
investment management and supervisory services to be performed by it under 
this Agreement, and shall, at its own expense, pay the compensation of the 
officers and employees, if any, of the Fund, and provide such office space 
and equipment and such clerical and bookkeeping services as the Fund shall 
reasonably require in the conduct of its business, 

<PAGE>

including the services of personnel in connection with the pricing of the 
Fund's shares and preparation of prospectuses, proxy statements and certain 
reports. The Investment Manager shall also bear the cost of telephone 
service, heat, light, power and other utilities provided to the Fund.

          5. The Fund assumes and shall pay or cause to be paid all other 
expenses of the Fund, including without limitation: the charges and expenses 
of any registrar, any custodian or depository appointed by the Fund for the 
safekeeping of its cash, portfolio securities and other property, and any 
stock transfer or dividend agent or agents appointed by the Fund; brokers' 
commissions chargeable to the Fund in connection with portfolio securities 
transactions to which the Fund is a party; all taxes, including securities 
issuance and transfer taxes, and fees payable by the Fund to Federal, State 
or other governmental agencies; the cost and expense of engraving or printing 
share certificates representing shares of the Fund; all costs and expenses in 
connection with the registration and maintenance of registration of the Fund 
and its shares with the Securities and Exchange Commission and various states 
and other jurisdictions (including filing fees and legal fees and 
disbursements of counsel); the cost and expense of printing (including 
typesetting) and distributing prospectuses of the Fund and supplements 
thereto to the Fund's shareholders; all expenses of shareholders' and 
Trustees' meetings and of preparing, printing and mailing proxy statements 
and reports to shareholders; fees and travel expenses of Trustees or members 
of any advisory board or committee who are not employees of the Investment 
Manager or any corporate affiliate of the Investment Manager; all expenses 
incident to the payment of any dividend, distribution, withdrawal or 
redemption, whether in shares or in cash; charges and expenses of any outside 
service used for pricing of the Fund's shares; charges and expenses of legal 
counsel, including counsel to the Trustees of the Fund who are not interested 
persons (as defined in the Act) of the Fund or the Investment Manager, and of 
independent accountants in connection with any matter relating to the Fund 
(but not including attorneys or accountants who are employees of the 
Investment Manager); membership dues of the Investment Company Institute; 
interest payable on Fund borrowings; postage; insurance premiums on property 
or personnel (including officers and Trustees) of the Fund which inure to its 
benefit; extraordinary expenses (including but not limited to legal claims 
and liabilities and litigation costs and any indemnification related 
thereto); and all other charges and costs of the Fund's operation unless 
otherwise explicitly provided herein.
 
          6. For the services to be rendered, the facilities furnished, and 
the expenses assumed by the Investment Manager, the Fund shall pay to the 
Investment Manager monthly compensation determined by applying the following 
annual rates to the Fund's daily net assets: 0.50% of the portion of the 
daily net assets not exceeding $500 million; 0.425% of the portion of the 
daily net assets exceeding $500 million but not exceeding $750 million; 
0.375% of the portion of the daily net assets exceeding $750 million but not 
exceeding $1 billion; 0.35% of the portion of the daily net assets exceeding 
$1 billion but not exceeding $1.5 billion; 0.325% of the portion of the daily 
net assets exceeding $1.5 billion but not exceeding $2 billion; 0.30% of the 
portion of the daily net assets exceeding $2 billion but not exceeding $2.5 
billion; 0.275% of the portion of the daily net assets exceeding $2.5 billion 
but not exceeding $3 billion; and 0.25% of the portion of the daily net 
assets exceeding $3 billion. Except as hereinafter set forth, compensation 
under this Agreement shall be calculated and accrued daily and the amounts of 
the daily accruals shall be paid monthly. Such calculations shall be made by 
applying 1/365ths of the annual rates to the Fund's net assets each day 
determined as of the close of business on that day or the last previous 
business day. If this Agreement becomes effective subsequent to the first day 
of a month or shall terminate before the last day of a month, compensation 
for that part of the month this Agreement is in effect shall be prorated in a 
manner consistent with the calculation of the fees as set forth above.
 
          7. The Investment Manager will use its best efforts in the 
supervision and management of the investment activities of the Fund, but in 
the absence of willful misfeasance, bad faith, gross negligence or reckless 
disregard of its obligations hereunder, the Investment Manager shall not be 
liable to the Fund or any of its investors for any error of judgment or 
mistake of law or for any act or omission by the Investment Manager or for 
any losses sustained by the Fund or its investors.
 
          8. Nothing contained in this Agreement shall prevent the Investment 
Manager or any affiliated person of the Investment Manager from acting as 
investment adviser or manager for any other person, firm or corporation and 
shall not in any way bind or restrict the Investment Manager or any such 
affiliated person


                                       2
<PAGE>

from buying, selling or trading any securities or commodities for their own
accounts or for the account of others for whom they may be acting. Nothing in
this Agreement shall limit or restrict the right of any director, officer or
employee of the Investment Manager to engage in any other business or to devote
his or her time and attention in part to the management or other aspects of any
other business whether of a similar or dissimilar nature.

          9. This Agreement shall remain in effect until April 30, 1999 and 
from year to year thereafter provided such continuance is approved at least 
annually by the vote of holders of a majority (as defined in the Act) of the 
outstanding voting securities of the Fund or by the Board of Trustees of the 
Fund; provided that in either event such continuance is also approved 
annually by the vote of a majority of the Trustees of the Fund who are not 
parties to this Agreement or "interested persons" (as defined in the Act) of 
any such party, which vote must be cast in person at a meeting called for the 
purpose of voting on such approval; provided, however, that (a) the Fund may, 
at any time and without the payment of any penalty, terminate this Agreement 
upon thirty days' written notice to the Investment Manager, either by 
majority vote of the Board of Trustees of the Fund or by the vote of a 
majority of the outstanding voting securities of the Fund; (b) this Agreement 
shall immediately terminate in the event of its assignment (within the 
meaning of the Act) unless such automatic termination shall be prevented by 
an exemptive order of the Securities and Exchange Commission; and (c) the 
Investment Manager may terminate this Agreement without payment of penalty on 
thirty days' written notice to the Fund. Any notice under this Agreement 
shall be given in writing, addressed and delivered, or mailed post-paid, to 
the other party at the principal office of such party.

         10. This Agreement may be amended by the parties without the vote or 
consent of shareholders of the Fund to supply any omission, to cure, correct 
or supplement any ambiguous, defective or inconsistent provision hereof, or 
if they deem it necessary to conform this Agreement to the requirements of 
applicable federal laws or regulations, but neither the Fund nor the 
Investment Manager shall be liable for failing to do so.
 
         11. This Agreement shall be construed in accordance with the law of 
the State of New York and the applicable provisions of the Act. To the extent 
the applicable law of the State of New York, or any of the provisions herein, 
conflicts with the applicable provisions of the Act, the latter shall 
control. If any provision of this Agreement shall be invalid or unenforceable 
for any reason the remainder of this Agreement shall not be affected thereby, 
but rather shall be enforceable to the greatest extent permitted by law.

         12. The Investment Manager and the Fund each agree that the name 
"Dean Witter," which comprises a component of the Fund's name, is a property 
right of Dean Witter Reynolds Inc. The Fund agrees and consents that (i) it 
will only use the name "Dean Witter" as a component of its name and for no 
other purpose, (ii) it will not purport to grant to any third party the right 
to use the name "Dean Witter" for any purpose, (iii) the Investment Manager 
or its parent, Morgan Stanley, Dean Witter, Discover & Co., or any corporate 
affiliate of the Investment Manager's parent, may use or grant to others the 
right to use the name "Dean Witter," or any combination or abbreviation 
thereof, as all or a portion of a corporate or business name or for any 
commercial purpose, including a grant of such right to any other investment 
company, (iv) at the request of the Investment Manager or its parent, the 
Fund will take such action as may be required to provide its consent to the 
use of the name "Dean Witter," or any combination or abbreviation thereof, by 
the Investment Manager or its parent or any corporate affiliate of the 
Investment Manager's parent, or by any person to whom the Investment Manager 
or its parent or any corporate affiliate of the Investment Manager's parent 
shall have granted the right to such use, and (v) upon the termination of any 
investment advisory agreement into which the Investment Manager and the Fund 
may enter, or upon termination of affiliation of the Investment Manager with 
its parent, the Fund shall, upon request by the Investment Manager or its 
parent, cease to use the name "Dean Witter" as a component of its name, and 
shall not use the name, or any combination or abbreviation thereof, as a part 
of its name or for any other commercial purpose, and shall cause its 
officers, Trustees and shareholders to take any and all actions which the 
Investment Manager or its parent may request to effect the foregoing and to 
reconvey to the Investment Manager or its parent any and all rights to such 
name.


                                       3
<PAGE>

         13. The Declaration of Trust establishing Dean Witter U.S. 
Government Money Market Trust, dated November 18, 1981, a copy of which, 
together with all amendments thereto (the "Declaration"), is on file in the 
office of the Secretary of the Commonwealth of Massachusetts, provides that 
the name Dean Witter U.S. Government Money Market Trust refers to the 
Trustees under the Declaration collectively as Trustees, but not as 
individuals or personally; and no Trustee, shareholder, officer, employee or 
agent of Dean Witter U.S. Government Money Market Trust shall be held to any 
personal liability, nor shall resort be had to their private property for the 
satisfaction of any obligation or claim or otherwise, in connection with the 
affairs of said Dean Witter U.S. Government Money Market Trust, but the Trust 
Estate only shall be liable.

    IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement on the day and year first above written in New York, New York.

<TABLE>
<S>                                       <C>
                                          DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

                                          By:
                                             -------------------------------------------


Attest:


- -----------------------------------------
                                          DEAN WITTER INTERCAPITAL INC.

                                          By:
                                             -------------------------------------------

Attest:

- -----------------------------------------
</TABLE>

                                       4

<PAGE>

                    DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

                                DISTRIBUTION AGREEMENT

     AGREEMENT made as of this 31st day of May, 1997 between Dean Witter U.S.
Government Money Market Trust, an unincorporated business trust organized
under the laws of the Commonwealth of Massachusetts (the "Fund"), and Dean
Witter Distributors Inc., a Delaware corporation (the "Distributor");

                                 W I T N E S S E T H:

     WHEREAS, the Fund is registered under the Investment Company Act of 1940,
as amended (the "1940 Act"), as a diversified open-end investment company and
it is in the interest of the Fund to offer its shares for sale continuously,
and

     WHEREAS, the Fund and the Distributor wish to enter into an agreement with
each other with respect to the continuous offering of the Fund's transferable
shares of beneficial interest, of $.01 par value (the "Shares"), in order to
promote the growth of the Fund and facilitate the distribution of its Shares.

     NOW, THEREFORE, the parties agree as follows:

     SECTION 1. APPOINTMENT OF THE DISTRIBUTOR. (a) The Fund hereby appoints
the Distributor as the principal underwriter of the Fund to sell Shares to
the public on the terms set forth in this Agreement and the Fund's prospectus
and the Distributor hereby accepts such appointment and agrees to act
hereunder. The Fund, during the term of this Agreement, shall sell Shares to
the Distributor upon the terms and conditions set forth herein.

     (b) The Distributor agrees to purchase Shares, as principal for its own
account, from the Fund and to sell Shares as principal to investors and
securities dealers, including Dean Witter Reynolds Inc. ("DWR"), an affiliate
of the Distributor, upon the terms described herein and in the Fund's
prospectus (the "Prospectus") and statement of additional information
included in the Fund's registration statement (the "Registration Statement")
most recently filed from time to time with the Securities and Exchange
Commission (the "SEC") and effective under the Securities Act of 1933, as
amended (the "1933 Act"), and 1940 Act or as said Prospectus may be otherwise
amended or supplemented and filed with the SEC pursuant to Rule 497 under the
1933 Act.

     SECTION 2. EXCLUSIVE NATURE OF DUTIES. The Distributor shall be the
exclusive principal underwriter and distributor of the Fund, except that the
exclusive rights granted to the Distributor to sell the Shares shall not
apply to Shares issued by the Fund: (i) in connection with the merger or
consolidation of any other investment company or personal holding company
with the Fund or the acquisition by purchase or otherwise of all (or
substantially all) the assets or the outstanding shares of any such company
by the Fund; or (ii) pursuant to reinvestment of dividends or capital gains
distributions; or (iii) pursuant to the reinstatement privilege afforded
redeeming shareholders.

     SECTION 3. PURCHASE OF SHARES FROM THE FUND. (a) The Distributor shall
have the right to buy from the Fund the Shares needed, but not more than the
Shares needed (except for clerical errors in transmission), to fill
unconditional orders for Shares placed with the Distributor by investors and
securities dealers. The price which the Distributor shall pay for the Shares
so purchased from the Fund shall be the net asset value, determined as set
forth in the Prospectus, used in determining the public offering price on
which such orders were based.

     (b) The shares are to be resold by the Distributor at the public offering
price, as set forth in the Prospectus, to investors or to securities dealers,
including DWR, having selected dealer agreements with the Distributor
pursuant to Section 7 ("Selected Dealers").

     (c) The Fund shall have the right to suspend the sale of the Shares at
times when redemption is suspended pursuant to the conditions set forth in
Section 4(e) hereof. The Fund shall also have the right


                                          1
<PAGE>

to suspend the sale of the Shares if trading on the New York Stock Exchange
shall have been suspended, if a banking moratorium shall have been declared
by federal or New York authorities, or if there shall have been some other
extraordinary event which, in the judgment of the Fund, makes it
impracticable to sell the Shares.

     (d) The Fund, or any agent of the Fund designated in writing by the Fund,
shall be promptly advised of all purchase orders for Shares received by the
Distributor. Any order may be rejected by the Fund; provided, however, that
the Fund will not arbitrarily or without reasonable cause refuse to accept
orders for the purchase of Shares. The Distributor will confirm orders upon
their receipt, and the Fund (or its agent) upon receipt of payment therefor
and instructions will deliver share certificates for such Shares or a
statement confirming the issuance of Shares. Payment shall be made to the
Fund in New York Clearing House funds. The Distributor agrees to cause such
payment and such instructions to be delivered promptly to the Fund (or its
agent).

     (e) With respect to Shares sold by any Selected Dealer, the Distributor is
authorized to direct the Fund's transfer agent to receive instructions
directly from the Selected Dealer on behalf of the Distributor as to
registration of Shares in the names of investors and to confirm issuance of
the Shares to such investors. The Distributor is also authorized to instruct
the transfer agent to receive payment directly from the Selected Dealer on
behalf of the Distributor, for prompt transmittal to the Fund's custodian, of
the purchase price of the Shares. In such event the Distributor shall obtain
from the Selected Dealer and maintain a record of such registration
instructions and payments.

     SECTION 4. REPURCHASE OR REDEMPTION OF SHARES. (a) Any of the outstanding
Shares may be tendered for redemption at any time, and the Fund agrees to
redeem the Shares so tendered in accordance with the applicable provisions
set forth in the Prospectus. The price to be paid to redeem the Shares shall
be equal to the net asset value determined as set forth in the Prospectus.
All payments by the Fund hereunder shall be made in the manner set forth
below.

     The proceeds of any redemption of Shares shall be paid by the Fund to the
redeeming shareholders, in each case in accordance with applicable provisions
of the Prospectus in New York Clearing House funds.

     (b) The Distributor is authorized, as agent for the Fund, to repurchase
Shares, represented by a share certificate which is delivered to any office
of the Distributor in accordance with applicable provisions set forth in the
Prospectus. The Distributor shall promptly transmit to the transfer agent of
the Fund for redemption all Shares so delivered. The Distributor shall be
responsible for the accuracy of instructions transmitted to the Fund's
transfer agent in connection with all such repurchases.

     (c) The Distributor is authorized, as agent for the Fund, to repurchase
Shares held in a shareholder's account with the Fund for which no share
certificate has been issued, upon the telephonic or telegraphic request of
the shareholder, or at the discretion of the Distributor. The Distributor
shall promptly transmit to the transfer agent of the Fund, for redemption,
all such orders for repurchase of Shares. Payment for Shares repurchased may
be made by the Fund to the Distributor for the account of the shareholder.
The Distributor shall be responsible for the accuracy of instructions
transmitted to the Fund's transfer agent in connection with all such
repurchases.

     (d) With respect to Shares tendered for redemption or repurchase by any
Selected Dealer on behalf of its customers, the Distributor is authorized to
instruct the transfer agent of the Fund to accept orders for redemption or
repurchase directly from the Selected Dealer on behalf of the Distributor and
to instruct the Fund to transmit payments for such redemptions and
repurchases directly to the Selected Dealer on behalf of the Distributor for
the account of the shareholder. The Distributor shall obtain from the
Selected Dealer, and shall maintain, a record of such orders. The Distributor
is further authorized to obtain from the Fund, and shall maintain, a record
of payments made directly to the Selected Dealer on behalf of the
Distributor.

     (e) Redemption of Shares or payment by the Fund may be suspended at times
when the New York Stock Exchange is closed, when trading on said Exchange is
restricted, when an emergency exists as a result of which disposal by the
Fund of securities owned by it is not reasonably practicable or it is not
reasonably practicable for the Fund fairly to determine the value of its net
assets, or during any other period when the SEC, by order, so permits.


                                          2
<PAGE>

     SECTION 5. DUTIES OF THE FUND. (a) The Fund shall furnish to the
Distributor copies of all information, financial statements and other papers
which the Distributor may reasonably request for use in connection with the
distribution of the Shares, including one certified copy, upon request by the
Distributor, of all financial statements prepared by the Fund and examined by
independent accountants. The Fund shall, at the expense of the Distributor,
make available to the Distributor such number of copies of the prospectus as
the Distributor shall reasonably request.

     (b) The Fund shall take, from time to time, but subject to the necessary
approval of its shareholders, all necessary action to register Shares under
the 1933 Act, to the end that there will be available for sale such number of
Shares as investors may reasonably be expected to purchase.

     (c) The Fund shall use its best efforts to pay the filing fees for an
appropriate number of the Shares for sale under the securities laws of such
states as the Distributor and the Fund may approve. Any qualification to sell
its Shares in a state may be withheld, terminated or withdrawn by the Fund at
any time in its discretion. As provided in Section 8(c) hereof, such filing
fees shall be borne by the Fund. The Distributor shall furnish such
information and other material relating to its affairs and activities as may
be required by the Fund in connection with the sale of its Shares in any
state.

     (d) The Fund shall, at the expense of the Distributor, furnish, in
reasonable quantities upon request by the Distributor, copies of annual and
interim reports of the Fund.

     SECTION 6. DUTIES OF THE DISTRIBUTOR. (a) The Distributor shall sell
Shares of the Fund through DWR and may sell Shares through other securities
dealers and its own Account Executives and shall devote reasonable time and
effort to promote sales of Shares, but shall not be obligated to sell any
specific number of Shares. The services of the Distributor hereunder are not
exclusive and it is understood that the Distributor may act as principal
underwriter for other registered investment companies and intends to do so in
the future. It is also understood that Selected Dealers, including DWR, may
also sell shares for other registered investment companies.

     (b) Neither the Distributor nor any Selected Dealer shall give any
information or make any representations, other than those contained in the
Registration Statement or related Prospectus and any sales literature
specifically approved by the Fund.

     (c) The Distributor agrees that it will comply with the applicable terms
and limitations of the Rules of the Association of the National Association
of Securities Dealers, Inc. ("NASD").

     SECTION 7. SELECTED DEALERS AGREEMENTS. (a) The Distributor shall have the
right to enter into selected dealers agreements with Selected Dealers for the
sale of Shares. In making agreements with Selected Dealers, the Distributor
shall act only as principal and not as agent for the Fund. Shares sold to
Selected Dealers shall be for resale by such dealers only at the public
offering price set forth in the Prospectus.

     (b) Within the United States, the Distributor shall offer and sell Shares
only to such Selected Dealers as are members in good standing of the NASD.

     (c) The Distributor shall adopt and follow procedures, as approved by the
Fund, for the confirmation of sales of Shares to investors and Selected
Dealers, the collection of amounts payable by investors and Selected Dealers
on such sales, and the cancellation of unsettled transactions, as may be
necessary to comply with the requirements of the NASD, as such requirements
may from time to time exist.

     SECTION 8. PAYMENT OF EXPENSES. (a) The Distributor shall bear all
expenses incurred by it in connection with its duties and activities under
this Agreement including the payment to Selected Dealers of any service fees
and other expenses for sales of a Fund's Shares (except such expenses as are
specifically undertaken herein by the Fund) incurred or paid by Selected
Dealers, including DWR. The Distributor shall bear the costs and expenses of
preparing, printing and distributing any supplementary sales literature used
by the Distributor or furnished by it for use by Selected Dealers in
connection with the offering of the Shares for sale. Any expenses of
advertising incurred in connection with such offering will also be the
obligation of the Distributor. It is understood and agreed that, so long as
the Fund's Plan of Distribution pursuant to Rule 12b-1 (the "Rule 12b-1
Plan") continues in effect, any expenses incurred by the Distributor
hereunder may be paid in accordance with the terms of such Rule 12b-1 Plan.


                                          3
<PAGE>

     (b) The Fund shall bear all costs and expenses of the Fund, including fees
and disbursements of legal counsel including counsel to the Trustees of the
Fund who are not interested persons (as defined in the 1940 Act) of the Fund
or the Distributor, and independent accountants, in connection with the
preparation and filing of any required Registration Statements and
Prospectuses and all amendments and supplements thereto, and the expenses of
preparing, printing, mailing and otherwise distributing prospectuses and
statements of additional information, annual or interim reports or proxy
materials to shareholders.

     (c) The Fund shall pay the filing fees and, if necessary or advisable in
connection therewith, bear the cost and expense qualifying the Fund as a
broker or dealer, in such states of the United States or other jurisdictions
as shall be selected by the Fund and the Distributor pursuant to Section 5(c)
hereof and the cost and expenses payable to each such state for continuing to
offer Shares therein until the Fund decides to discontinue selling Shares
pursuant to Section 5(c) hereof.

     SECTION 9. INDEMNIFICATION. (a) The Fund shall indemnify and hold harmless
the Distributor and each person, if any, who controls the Distributor against
any loss, liability, claim, damage or expense (including the reasonable cost
of investigating or defending any alleged loss, liability, claim, damage or
expense and reasonable counsel fees incurred in connection therewith),
arising by reason of any person acquiring any Shares, which may be based upon
the 1933 Act, or on any other statute or at common law, on the ground that
the Registration Statement or related Prospectus as from time to time amended
and supplemented, or the annual or interim reports to shareholders of the
Fund, includes an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary in order to make the
statements therein not misleading, unless such statement or omission was made
in reliance upon, and in conformity with, information furnished to the Fund
in connection therewith by or on behalf of the Distributor; provided,
however, that in no case (i) is the indemnity of the Fund in favor of the
Distributor and any such controlling persons to be deemed to protect the
Distributor or any such controlling persons thereof against any liability to
the Fund or its security holders to which the Distributor or any such
controlling persons would otherwise be subject by reason of willful
misfeasance, bad faith or gross negligence in the performance of its duties
or by reason of reckless disregard of its obligations and duties under this
Agreement; or (ii) is the Fund to be liable under its indemnity agreement
contained in this paragraph with respect to any claim made against the
Distributor or any such controlling persons, unless the Distributor or any
such controlling persons, as the case may be, shall have notified the Fund in
writing within a reasonable time after the summons or other first legal
process giving information of the nature of the claim shall have been served
upon the Distributor or such controlling persons (or after the Distributor or
such controlling persons shall have received notice of such service on any
designated agent), but failure to notify the Fund of any such claim shall not
relieve it from any liability which it may have to the person against whom
such action is brought otherwise than on account of its indemnity agreement
contained in this paragraph. The Fund will be entitled to participate at its
own expense in the defense or if it so elects, to assume the defense, of any
suit brought to enforce any such liability, but if the Fund elects to assume
the defense, such defense shall be conducted by counsel chosen by it and
satisfactory to the Distributor or such controlling person or persons,
defendant or defendants in the suit. In the event the Fund elects to assume
the defense of any such suit and retain such counsel, the Distributor or such
controlling person or persons, defendant or defendants in the suit, shall
bear the fees and expenses of any additional counsel retained by them, but,
in case the Fund does not elect to assume the defense of any such suit, it
will reimburse the Distributor or such controlling person or persons,
defendant or defendants in the suit, for the reasonable fees and expenses of
any counsel retained by them. The Fund shall promptly notify the Distributor
of the commencement of any litigation or proceedings against it or any of its
officers or trustees in connection with the issuance or sale of the Shares.

     (b) (i) The Distributor shall indemnify and hold harmless the Fund and
each of its Trustees and officers and each person, if any, who controls the
Fund against any loss, liability, claim, damage or expense described in the
foregoing indemnity contained in subsection (a) of this Section, but only
with respect to statements or omissions made in reliance upon, and in
conformity with, information furnished to the Fund in writing by or on behalf
of the Distributor for use in connection with the Registration Statement or
related Prospectus, as from time to time may be amended, or the annual or
interim reports to shareholders.


                                          4
<PAGE>

     (ii) The Distributor shall indemnify and hold harmless the Fund and the
Fund's transfer agent, individually and in its capacity as the Fund's
transfer agent, from and against any claims, damages and liabilities which
arise as a result of actions taken pursuant to instructions from, or on
behalf of the Distributor to: (1) redeem all or a part of shareholder
accounts in the Fund pursuant to Section 4 hereof and pay the proceeds to the
Distributor for the account of each shareholder whose Shares are so redeemed;
and (2) register Shares in the names of investors, confirm the issuance
thereof and receive payment therefor pursuant to Section 3(e).

     (iii) In case any action shall be brought against the Fund or any person
so indemnified by this subsection 9(b) in respect of which indemnity may be
sought against the Distributor, the Distributor shall have the rights and
duties given to the Fund, and the Fund and each person so indemnified shall
have the rights and duties given to the Distributor by the provisions of
subsection (a) of this Section 9.

     (c) If the indemnification provided for in this Section 9 is unavailable
or insufficient to hold harmless an indemnified party under subsection (a) or
(b) above in respect of any losses, claims, damages, liabilities or expenses
(or actions in respect thereof) referred to herein, then each indemnifying
party shall contribute to the amount paid or payable by such indemnified
party as a result of such losses, claims, damages, liabilities or expenses
(or actions in respect thereof) in such proportion as is appropriate to
reflect the relative benefits received by the Fund on the one hand and the
Distributor on the other from the offering of the Shares. If, however, the
allocation provided by the immediately preceding sentence is not permitted by
applicable law, then each indemnifying party shall contribute to such amount
paid or payable by such indemnified party in such proportion as is
appropriate to reflect not only such relative benefits but also the relative
fault of the Fund on the one hand and the Distributor on the other in
connection with the statements or omissions which resulted in such losses,
claims, damages, liabilities or expenses (or actions in respect thereof), as
well as any other relevant equitable considerations. The relative benefits
received by the Fund on the one hand and the Distributor on the other shall
be deemed to be in the same proportion as the total net proceeds from the
offering (before deducting expenses) received by the Fund bear to the total
compensation received by the Distributor, in each case as set forth in the
Prospectus. The relative fault shall be determined by reference to, among
other things, whether the untrue or alleged untrue statement of a material
fact or the omission or alleged omission to state a material fact relates to
information supplied by the Fund or the Distributor and the parties' relative
intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Fund and the Distributor agree that
it would not be just and equitable if contribution were determined by pro
rata allocation or by any other method of allocation which does not take into
account the equitable considerations referred to above. The amount paid or
payable by an indemnified party as a result of the losses, claims, damages,
liabilities or expenses (or actions in respect thereof) referred to above
shall be deemed to include any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending any such
claim. Notwithstanding the provisions of this subsection (c), the Distributor
shall not be required to contribute any amount in excess of the amount by
which the total price at which the Shares distributed by it to the public
were offered to the public exceeds the amount of any damages which it has
otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall
be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.

     SECTION 10. DURATION AND TERMINATION OF THIS AGREEMENT. This Agreement
shall become effective as of the date first above written and shall remain in
force until April 30, 1998 and thereafter, but only so long as such
continuance is specifically approved at least annually by (i) the Trustees of
the Fund, or by the vote of a majority of the outstanding voting securities
of the Fund, cast in person or by proxy, and (ii) a majority of those
Trustees who are not parties to this Agreement or interested persons of any
such party and who have no direct or indirect financial interest in this
Agreement or in the operation of the Fund's Rule 12b-1 Plan or in any
agreement related thereto, cast in person at a meeting called for the purpose
of voting upon such approval.

     This Agreement may be terminated at any time, without the payment of any
penalty, by the Trustees of the Fund, by a majority of the Trustees of the
Fund who are not interested persons of the Fund and


                                          5
<PAGE>

who have no direct or indirect financial interest in this Agreement or by
vote of a majority of the outstanding voting securities of the Fund, or by
the Distributor, on sixty days' written notice to the other party. This
Agreement shall automatically terminate in the event of its assignment.

     The terms "vote of a majority of the outstanding voting securities,"
"assignment" and "interested person," when used in this Agreement, shall have
the respective meanings specified in the 1940 Act.

     SECTION 11. AMENDMENTS OF THIS AGREEMENT. This Agreement may be amended by
the parties only if such amendment is specifically approved by (i) the
Trustees of the Fund, or by the vote of a majority of outstanding voting
securities of the Fund, and (ii) a majority of those Trustees of the Fund who
are not parties to this Agreement or interested persons of any such party and
who have no direct or indirect financial interest in this Agreement or in any
Agreement related to the Fund's 12b-1 Plan, cast in person at a meeting
called for the purpose of voting on such approval.

     SECTION 12. GOVERNING LAW. This Agreement shall be construed in accordance
with the law of the State of New York and the applicable provisions of the
1940 Act. To the extent the applicable law of the State of New York, or any
of the provisions herein, conflict with the applicable provisions of the 1940
Act, the latter shall control.

     SECTION 13. PERSONAL LIABILITY. The Declaration of Trust establishing Dean
Witter U.S. Government Money Market Trust, dated November 18, 1981, a copy of
which, together with all amendments thereto (the "Declaration"), is on file
in the office of the Secretary of the Commonwealth of Massachusetts, provides
that the name Dean Witter U.S. Government Money Market Trust refers to the
Trustees under the Declaration collectively as Trustees, but not as
individuals or personally; and no Trustee, shareholder, officer, employee or
agent of Dean Witter U.S. Government Money Market Trust shall be held to any
personal liability, nor shall resort be had to their private property for the
satisfaction of any obligation or claim or otherwise, in connection with the
affairs of said Dean Witter U.S. Government Money Market Trust, but the Trust
Estate only shall be liable.

     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the day and year first written in New York, New York.

                                             DEAN WITTER U.S. GOVERNMENT
                                             MONEY MARKET TRUST



                                             By:
                                                --------------------------------


                                             DEAN WITTER DISTRIBUTORS INC.



                                             By:
                                                --------------------------------


                                          6

<PAGE>

                              AMENDED AND RESTATED
                     TRANSFER AGENCY AND SERVICE AGREEMENT

                                      WITH

                             DEAN WITTER TRUST FSB

[open-end funds]

97NYC13142
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                      PAGE
                                                                      ----
<S>          <C>                                                      <C>
Article 1    Terms of Appointment...................................    1
 
Article 2    Fees and Expenses......................................    2
 
Article 3    Representations and Warranties of DWTFSB...............    3
 
Article 4    Representations and Warranties of the Fund.............    3
 
Article 5    Duty of Care and Indemnification.......................    3
 
Article 6    Documents and Covenants of the Fund and DWTFSB.........    4
 
Article 7    Duration and Termination of Agreement..................    5
 
Article 8    Assignment.............................................    5
 
Article 9    Affiliations...........................................    6
 
Article 10   Amendment..............................................    6
 
Article 11   Applicable Law.........................................    6
 
Article 12   Miscellaneous..........................................    6
 
Article 13   Merger of Agreement....................................    7
 
Article 14   Personal Liability.....................................    7
</TABLE>
 
                                       i
<PAGE>
           AMENDED AND RESTATED TRANSFER AGENCY AND SERVICE AGREEMENT
 
    AMENDED AND RESTATED AGREEMENT made as of the 23rd day of October, 1997 by
and between each of the Funds listed on the signature pages hereof, each of such
Funds acting severally on its own behalf and not jointly with any of such other
Funds (each such Fund hereinafter referred to as the "Fund"), each such Fund
having its principal office and place of business at Two World Trade Center, New
York, New York, 10048, and DEAN WITTER TRUST FSB ("DWTFSB"), a federally
chartered savings bank, having its principal office and place of business at
Harborside Financial Center, Plaza Two, Jersey City, New Jersey 07311.
 
    WHEREAS, the Fund desires to appoint DWTFSB as its transfer agent, dividend
disbursing agent and shareholder servicing agent and DWTFSB desires to accept
such appointment;
 
    NOW THEREFORE, in consideration of the mutual covenants herein contained,
the parties hereto agree as follows:
 
Article 1  TERMS OF APPOINTMENT; DUTIES OF DWTFSB
 
    1.1 Subject to the terms and conditions set forth in this Agreement, the
Fund hereby employs and appoints DWTFSB to act as, and DWTFSB agrees to act as,
the transfer agent for each series and class of shares of the Fund, whether now
or hereafter authorized or issued ("Shares"), dividend disbursing agent and
shareholder servicing agent in connection with any accumulation, open-account or
similar plans provided to the holders of such Shares ("Shareholders") and set
out in the currently effective prospectus and statement of additional
information ("prospectus") of the Fund, including without limitation any
periodic investment plan or periodic withdrawal program.
 
    1.2 DWTFSB agrees that it will perform the following services:
 
        (a) In accordance with procedures established from time to time by
    agreement between the Fund and DWTFSB, DWTFSB shall:
 
           (i) Receive for acceptance, orders for the purchase of Shares, and
       promptly deliver payment and appropriate documentation therefor to the
       custodian of the assets of the Fund (the "Custodian");
 
           (ii) Pursuant to purchase orders, issue the appropriate number of
       Shares and issue certificates therefor or hold such Shares in book form
       in the appropriate Shareholder account;
 
           (iii) Receive for acceptance redemption requests and redemption
       directions and deliver the appropriate documentation therefor to the
       Custodian;
 
           (iv) At the appropriate time as and when it receives monies paid to
       it by the Custodian with respect to any redemption, pay over or cause to
       be paid over in the appropriate manner such monies as instructed by the
       redeeming Shareholders;
 
           (v) Effect transfers of Shares by the registered owners thereof upon
       receipt of appropriate instructions;
 
           (vi) Prepare and transmit payments for dividends and distributions
       declared by the Fund;
 
           (vii) Calculate any sales charges payable by a Shareholder on
       purchases and/or redemptions of Shares of the Fund as such charges may be
       reflected in the prospectus;
 
           (viii) Maintain records of account for and advise the Fund and its
       Shareholders as to the foregoing; and
 
           (ix) Record the issuance of Shares of the Fund and maintain pursuant
       to Rule 17Ad-10(e) under the Securities Exchange Act of 1934 ("1934 Act")
       a record of the total number of Shares of the Fund which are authorized,
       based upon data provided to it by the Fund, and issued and outstanding.
       DWTFSB shall also provide to the Fund on a regular basis the total number
       of Shares that are authorized, issued and outstanding and shall notify
       the Fund in case any proposed issue of Shares by the Fund would result in
       an overissue. In case any issue of Shares
 
                                       1
<PAGE>
       would result in an overissue, DWTFSB shall refuse to issue such Shares
       and shall not countersign and issue any certificates requested for such
       Shares. When recording the issuance of Shares, DWTFSB shall have no
       obligation to take cognizance of any Blue Sky laws relating to the issue
       of sale of such Shares, which functions shall be the sole responsibility
       of the Fund.
 
        (b) In addition to and not in lieu of the services set forth in the
    above paragraph (a), DWTFSB shall:
 
           (i) perform all of the customary services of a transfer agent,
       dividend disbursing agent and, as relevant, shareholder servicing agent
       in connection with dividend reinvestment, accumulation, open-account or
       similar plans (including without limitation any periodic investment plan
       or periodic withdrawal program), including but not limited to,
       maintaining all Shareholder accounts, preparing Shareholder meeting
       lists, mailing proxies, receiving and tabulating proxies, mailing
       shareholder reports and prospectuses to current Shareholders, withholding
       taxes on U.S. resident and non-resident alien accounts, preparing and
       filing appropriate forms required with respect to dividends and
       distributions by federal tax authorities for all Shareholders, preparing
       and mailing confirmation forms and statements of account to Shareholders
       for all purchases and redemptions of Shares and other confirmable
       transactions in Shareholder accounts, preparing and mailing activity
       statements for Shareholders and providing Shareholder account
       information;
 
           (ii) open any and all bank accounts which may be necessary or
       appropriate in order to provide the foregoing services; and
 
           (iii) provide a system that will enable the Fund to monitor the total
       number of Shares sold in each State or other jurisdiction.
 
        (c) In addition, the Fund shall:
 
           (i) identify to DWTFSB in writing those transactions and assets to be
       treated as exempt from Blue Sky reporting for each State; and
 
           (ii) verify the inclusion on the system prior to activation of each
       State in which Fund shares may be sold and thereafter monitor the daily
       purchases and sales for shareholders in each State. The responsibility of
       DWTFSB for the Fund's status under the securities laws of any State or
       other jurisdiction is limited to the inclusion on the system of each
       State as to which the Fund has informed DWTFSB that shares may be sold in
       compliance with state securities laws and the reporting of purchases and
       sales in each such State to the Fund as provided above and as agreed from
       time to time by the Fund and DWTFSB.
 
        (d) DWTFSB shall provide such additional services and functions not
    specifically described herein as may be mutually agreed between DWTFSB and
    the Fund. Procedures applicable to such services may be established from
    time to time by agreement between the Fund and DWTFSB.
 
Article 2  FEES AND EXPENSES
 
    2.1 For performance by DWTFSB pursuant to this Agreement, each Fund agrees
to pay DWTFSB an annual maintenance fee for each Shareholder account and certain
transactional fees, if applicable, as set out in the respective fee schedule
attached hereto as Schedule A. Such fees and out-of-pocket expenses and advances
identified under Section 2.2 below may be changed from time to time subject to
mutual written agreement between the Fund and DWTFSB.
 
    2.2 In addition to the fees paid under Section 2.1 above, the Fund agrees to
reimburse DWTFSB for out of pocket expenses in connection with the services
rendered by DWTFSB hereunder. In addition, any other expenses incurred by DWTFSB
at the request or with the consent of the Fund will be reimbursed by the Fund.
 
    2.3 The Fund agrees to pay all fees and reimbursable expenses within a
reasonable period of time following the mailing of the respective billing
notice. Postage for mailing of dividends, proxies, Fund reports and other
mailings to all Shareholder accounts shall be advanced to DWTFSB by the Fund
upon request prior to the mailing date of such materials.
 
                                       2
<PAGE>
Article 3  REPRESENTATIONS AND WARRANTIES OF DWTFSB
 
    DWTFSB represents and warrants to the Fund that:
 
    3.1 It is a federally chartered savings bank whose principal office is in
New Jersey.
 
    3.2 It is and will remain registered with the U.S. Securities and Exchange
Commission ("SEC") as a Transfer Agent pursuant to the requirements of Section
17A of the 1934 Act.
 
    3.3 It is empowered under applicable laws and by its charter and By-Laws to
enter into and perform this Agreement.
 
    3.4 All requisite corporate proceedings have been taken to authorize it to
enter into and perform this Agreement.
 
    3.5 It has and will continue to have access to the necessary facilities,
equipment and personnel to perform its duties and obligations under this
Agreement.
 
Article 4  REPRESENTATIONS AND WARRANTIES OF THE FUND
 
    The Fund represents and warrants to DWTFSB that:
 
    4.1 It is a corporation duly organized and existing and in good standing
under the laws of Delaware or Maryland or a trust duly organized and existing
and in good standing under the laws of Massachusetts, as the case may be.
 
    4.2 It is empowered under applicable laws and by its Articles of
Incorporation or Declaration of Trust, as the case may be, and under its By-Laws
to enter into and perform this Agreement.
 
    4.3 All corporate proceedings necessary to authorize it to enter into and
perform this Agreement have been taken.
 
    4.4 It is an investment company registered with the SEC under the Investment
Company Act of 1940, as amended (the "1940 Act").
 
    4.5 A registration statement under the Securities Act of 1933 (the "1933
Act") is currently effective and will remain effective, and appropriate state
securities law filings have been made and will continue to be made, with respect
to all Shares of the Fund being offered for sale.
 
Article 5  DUTY OF CARE AND INDEMNIFICATION
 
    5.1 DWTFSB shall not be responsible for, and the Fund shall indemnify and
hold DWTFSB harmless from and against, any and all losses, damages, costs,
charges, counsel fees, payments, expenses and liability arising out of or
attributable to:
 
        (a) All actions of DWTFSB or its agents or subcontractors required to be
    taken pursuant to this Agreement, provided that such actions are taken in
    good faith and without negligence or willful misconduct.
 
        (b) The Fund's refusal or failure to comply with the terms of this
    Agreement, or which arise out of the Fund's lack of good faith, negligence
    or willful misconduct or which arise out of breach of any representation or
    warranty of the Fund hereunder.
 
        (c) The reliance on or use by DWTFSB or its agents or subcontractors of
    information, records and documents which (i) are received by DWTFSB or its
    agents or subcontractors and furnished to it by or on behalf of the Fund,
    and (ii) have been prepared and/or maintained by the Fund or any other
    person or firm on behalf of the Fund.
 
        (d) The reliance on, or the carrying out by DWTFSB or its agents or
    subcontractors of, any instructions or requests of the Fund.
 
        (e) The offer or sale of Shares in violation of any requirement under
    the federal securities laws or regulations or the securities or Blue Sky
    laws of any State or other jurisdiction that notice of
 
                                       3
<PAGE>
    offering of such Shares in such State or other jurisdiction or in violation
    of any stop order or other determination or ruling by any federal agency or
    any State or other jurisdiction with respect to the offer or sale of such
    Shares in such State or other jurisdiction.
 
    5.2 DWTFSB shall indemnify and hold the Fund harmless from or against any
and all losses, damages, costs, charges, counsel fees, payments, expenses and
liability arising out of or attributable to any action or failure or omission to
act by DWTFSB as a result of the lack of good faith, negligence or willful
misconduct of DWTFSB, its officers, employees or agents.
 
    5.3 At any time, DWTFSB may apply to any officer of the Fund for
instructions, and may consult with legal counsel to the Fund, with respect to
any matter arising in connection with the services to be performed by DWTFSB
under this Agreement, and DWTFSB and its agents or subcontractors shall not be
liable and shall be indemnified by the Fund for any action taken or omitted by
it in reliance upon such instructions or upon the opinion of such counsel.
DWTFSB, its agents and subcontractors shall be protected and indemnified in
acting upon any paper or document furnished by or on behalf of the Fund,
reasonably believed to be genuine and to have been signed by the proper person
or persons, or upon any instruction, information, data, records or documents
provided to DWTFSB or its agents or subcontractors by machine readable input,
telex, CRT data entry or other similar means authorized by the Fund, and shall
not be held to have notice of any change of authority of any person, until
receipt of written notice thereof from the Fund. DWTFSB, its agents and
subcontractors shall also be protected and indemnified in recognizing stock
certificates which are reasonably believed to bear the proper manual or
facsimile signature of the officers of the Fund, and the proper countersignature
of any former transfer agent or registrar, or of a co-transfer agent or
co-registrar.
 
    5.4 In the event either party is unable to perform its obligations under the
terms of this Agreement because of acts of God, strikes, equipment or
transmission failure or damage reasonably beyond its control, or other causes
reasonably beyond its control, such party shall not be liable for damages to the
other for any damages resulting from such failure to perform or otherwise from
such causes.
 
    5.5 Neither party to this Agreement shall be liable to the other party for
consequential damages under any provision of this Agreement or for any act or
failure to act hereunder.
 
    5.6 In order that the indemnification provisions contained in this Article 5
shall apply, upon the assertion of a claim for which either party may be
required to indemnify the other, the party seeking indemnification shall
promptly notify the other party of such assertion, and shall keep the other
party advised with respect to all developments concerning such claim. The party
who may be required to indemnify shall have the option to participate with the
party seeking indemnification in the defense of such claim. The party seeking
indemnification shall in no case confess any claim or make any compromise in any
case in which the other party may be required to indemnify it except with the
other party's prior written consent.
 
Article 6  DOCUMENTS AND COVENANTS OF THE FUND AND DWTFSB
 
    6.1 The Fund shall promptly furnish to DWTFSB the following, unless
previously furnished to Dean Witter Trust Company, the prior transfer agent of
the Fund:
 
        (a) If a corporation:
 
           (i) A certified copy of the resolution of the Board of Directors of
       the Fund authorizing the appointment of DWTFSB and the execution and
       delivery of this Agreement;
 
           (ii) A certified copy of the Articles of Incorporation and By-Laws of
       the Fund and all amendments thereto;
 
           (iii) Certified copies of each vote of the Board of Directors
       designating persons authorized to give instructions on behalf of the Fund
       and signature cards bearing the signature of any officer of the Fund or
       any other person authorized to sign written instructions on behalf of the
       Fund;
 
           (iv) A specimen of the certificate for Shares of the Fund in the form
       approved by the Board of Directors, with a certificate of the Secretary
       of the Fund as to such approval;
 
                                       4
<PAGE>
        (b) If a business trust:
 
           (i) A certified copy of the resolution of the Board of Trustees of
       the Fund authorizing the appointment of DWTFSB and the execution and
       delivery of this Agreement;
 
           (ii) A certified copy of the Declaration of Trust and By-Laws of the
       Fund and all amendments thereto;
 
           (iii) Certified copies of each vote of the Board of Trustees
       designating persons authorized to give instructions on behalf of the Fund
       and signature cards bearing the signature of any officer of the Fund or
       any other person authorized to sign written instructions on behalf of the
       Fund;
 
           (iv) A specimen of the certificate for Shares of the Fund in the form
       approved by the Board of Trustees, with a certificate of the Secretary of
       the Fund as to such approval;
 
        (c) The current registration statements and any amendments and
    supplements thereto filed with the SEC pursuant to the requirements of the
    1933 Act or the 1940 Act;
 
        (d) All account application forms or other documents relating to
    Shareholder accounts and/or relating to any plan, program or service offered
    or to be offered by the Fund; and
 
        (e) Such other certificates, documents or opinions as DWTFSB deems to be
    appropriate or necessary for the proper performance of its duties.
 
    6.2 DWTFSB hereby agrees to establish and maintain facilities and procedures
reasonably acceptable to the Fund for safekeeping of Share certificates, check
forms and facsimile signature imprinting devices, if any; and for the
preparation or use, and for keeping account of, such certificates, forms and
devices.
 
    6.3 DWTFSB shall prepare and keep records relating to the services to be
performed hereunder, in the form and manner as it may deem advisable and as
required by applicable laws and regulations. To the extent required by Section
31 of the 1940 Act, and the rules and regulations thereunder, DWTFSB agrees that
all such records prepared or maintained by DWTFSB relating to the services
performed by DWTFSB hereunder are the property of the Fund and will be
preserved, maintained and made available in accordance with such Section 31 of
the 1940 Act, and the rules and regulations thereunder, and will be surrendered
promptly to the Fund on and in accordance with its request.
 
    6.4 DWTFSB and the Fund agree that all books, records, information and data
pertaining to the business of the other party which are exchanged or received
pursuant to the negotiation or the carrying out of this Agreement shall remain
confidential and shall not be voluntarily disclosed to any other person except
as may be required by law or with the prior consent of DWTFSB and the Fund.
 
    6.5 In case of any request or demands for the inspection of the Shareholder
records of the Fund, DWTFSB will endeavor to notify the Fund and to secure
instructions from an authorized officer of the Fund as to such inspection.
DWTFSB reserves the right, however, to exhibit the Shareholder records to any
person whenever it is advised by its counsel that it may be held liable for the
failure to exhibit the Shareholder records to such person.
 
Article 7  DURATION AND TERMINATION OF AGREEMENT
 
    7.1 This Agreement shall remain in full force and effect until August 1,
2000 and from year-to-year thereafter unless terminated by either party as
provided in Section 7.2 hereof.
 
    7.2 This Agreement may be terminated by the Fund on 60 days written notice,
and by DWTFSB on 90 days written notice, to the other party without payment of
any penalty.
 
    7.3 Should the Fund exercise its right to terminate, all out-of-pocket
expenses associated with the movement of records and other materials will be
borne by the Fund. Additionally, DWTFSB reserves the right to charge for any
other reasonable fees and expenses associated with such termination.
 
Article 8  ASSIGNMENT
 
    8.1 Except as provided in Section 8.3 below, neither this Agreement nor any
rights or obligations hereunder may be assigned by either party without the
written consent of the other party.
                                       5
<PAGE>
    8.2 This Agreement shall inure to the benefit of and be binding upon the
parties and their respective permitted successors and assigns.
 
    8.3 DWTFSB may, in its sole discretion and without further consent by the
Fund, subcontract, in whole or in part, for the performance of its obligations
and duties hereunder with any person or entity including but not limited to
companies which are affiliated with DWTFSB; PROVIDED, HOWEVER, that such person
or entity has and maintains the qualifications, if any, required to perform such
obligations and duties, and that DWTFSB shall be as fully responsible to the
Fund for the acts and omissions of any agent or subcontractor as it is for its
own acts or omissions under this Agreement.
 
Article 9  AFFILIATIONS
 
    9.1 DWTFSB may now or hereafter, without the consent of or notice to the
Fund, function as transfer agent and/or shareholder servicing agent for any
other investment company registered with the SEC under the 1940 Act and for any
other issuer, including without limitation any investment company whose adviser,
administrator, sponsor or principal underwriter is or may become affiliated with
Morgan Stanley, Dean Witter, Discover & Co. or any of its direct or indirect
subsidiaries or affiliates.
 
    9.2 It is understood and agreed that the Directors or Trustees (as the case
may be), officers, employees, agents and shareholders of the Fund, and the
directors, officers, employees, agents and shareholders of the Fund's investment
adviser and/or distributor, are or may be interested in DWTFSB as directors,
officers, employees, agents and shareholders or otherwise, and that the
directors, officers, employees, agents and shareholders of DWTFSB may be
interested in the Fund as Directors or Trustees (as the case may be), officers,
employees, agents and shareholders or otherwise, or in the investment adviser
and/or distributor as directors, officers, employees, agents, shareholders or
otherwise.
 
Article 10  AMENDMENT
 
    10.1 This Agreement may be amended or modified by a written agreement
executed by both parties and authorized or approved by a resolution of the Board
of Directors or the Board of Trustees (as the case may be) of the Fund.
 
Article 11  APPLICABLE LAW
 
    11.1 This Agreement shall be construed and the provisions thereof
interpreted under and in accordance with the laws of the State of New York.
 
Article 12  MISCELLANEOUS
 
    12.1 In the event that one or more additional investment companies managed
or administered by Dean Witter InterCapital Inc. or any of its affiliates
("Additional Funds") desires to retain DWTFSB to act as transfer agent, dividend
disbursing agent and/or shareholder servicing agent, and DWTFSB desires to
render such services, such services shall be provided pursuant to a letter
agreement, substantially in the form of Exhibit A hereto, between DWTFSB and
each Additional Fund.
 
    12.2 In the event of an alleged loss or destruction of any Share
certificate, no new certificate shall be issued in lieu thereof, unless there
shall first be furnished to DWTFSB an affidavit of loss or non-receipt by the
holder of Shares with respect to which a certificate has been lost or destroyed,
supported by an appropriate bond satisfactory to DWTFSB and the Fund issued by a
surety company satisfactory to DWTFSB, except that DWTFSB may accept an
affidavit of loss and indemnity agreement executed by the registered holder (or
legal representative) without surety in such form as DWTFSB deems appropriate
indemnifying DWTFSB and the Fund for the issuance of a replacement certificate,
in cases where the alleged loss is in the amount of $1,000 or less.
 
    12.3 In the event that any check or other order for payment of money on the
account of any Shareholder or new investor is returned unpaid for any reason,
DWTFSB will (a) give prompt notification to the Fund's distributor
("Distributor") (or to the Fund if the Fund acts as its own distributor) of such
non-payment; and (b) take such other action, including imposition of a
reasonable processing or handling fee, as DWTFSB may, in its sole discretion,
deem appropriate or as the Fund and, if applicable, the Distributor may instruct
DWTFSB.
 
                                       6
<PAGE>
    12.4 Any notice or other instrument authorized or required by this Agreement
to be given in writing to the Fund or to DWTFSB shall be sufficiently given if
addressed to that party and received by it at its office set forth below or at
such other place as it may from time to time designate in writing.
 
To the Fund:
 
[Name of Fund]
Two World Trade Center
New York, New York 10048
 
Attention: General Counsel
 
To DWTFSB:
 
Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
Attention: President
 
Article 13  MERGER OF AGREEMENT
 
    13.1 This Agreement constitutes the entire agreement between the parties
hereto and supersedes any prior agreement with respect to the subject matter
hereof whether oral or written.
 
Article 14  PERSONAL LIABILITY
 
    14.1 In the case of a Fund organized as a Massachusetts business trust, a
copy of the Declaration of Trust of the Fund is on file with the Secretary of
The Commonwealth of Massachusetts, and notice is hereby given that this
instrument is executed on behalf of the Board of Trustees of the Fund as
Trustees and not individually and that the obligations of this instrument are
not binding upon any of the Trustees or shareholders individually but are
binding only upon the assets and property of the Fund; provided, however, that
the Declaration of Trust of the Fund provides that the assets of a particular
Series of the Fund shall under no circumstances be charged with liabilities
attributable to any other Series of the Fund and that all persons extending
credit to, or contracting with or having any claim against, a particular Series
of the Fund shall look only to the assets of that particular Series for payment
of such credit, contract or claim.
 
    IN WITNESS WHEREOF, the parties hereto have caused this Amended and Restated
Agreement to be executed in their names and on their behalf by and through their
duly authorized officers, as of the day and year first above written.
 
DEAN WITTER FUNDS
 
    MONEY MARKET FUNDS
 
 1.  Dean Witter Liquid Asset Fund Inc.
 2.  Active Assets Money Trust
 3.  Dean Witter U.S. Government Money Market Trust
 4.  Active Assets Government Securities Trust
 5.  Dean Witter Tax-Free Daily Income Trust
 6.  Active Assets Tax-Free Trust
 7.  Dean Witter California Tax-Free Daily Income Trust
 8.  Dean Witter New York Municipal Money Market Trust
 9.  Active Assets California Tax-Free Trust
 
    EQUITY FUNDS
 
10.  Dean Witter American Value Fund
11.  Dean Witter Mid-Cap Growth Fund
12.  Dean Witter Dividend Growth Securities Inc.
 
                                       7
<PAGE>
13.  Dean Witter Capital Growth Securities
14.  Dean Witter Global Dividend Growth Securities
15.  Dean Witter Income Builder Fund
16.  Dean Witter Natural Resource Development Securities Inc.
17.  Dean Witter Precious Metals and Minerals Trust
18.  Dean Witter Developing Growth Securities Trust
19.  Dean Witter Health Sciences Trust
20.  Dean Witter Capital Appreciation Fund
21.  Dean Witter Information Fund
22.  Dean Witter Value-Added Market Series
23.  Dean Witter World Wide Investment Trust
24.  Dean Witter European Growth Fund Inc.
25.  Dean Witter Pacific Growth Fund Inc.
26.  Dean Witter International SmallCap Fund
27.  Dean Witter Japan Fund
28.  Dean Witter Utilities Fund
29.  Dean Witter Global Utilities Fund
30.  Dean Witter Special Value Fund
31.  Dean Witter Financial Services Trust
32.  Dean Witter Market Leader Trust
33.  Dean Witter Managers' Select Fund
34.  Dean Witter Fund of Funds
35.  Dean Witter S&P 500 Index Fund
 
    BALANCED FUNDS
 
36.  Dean Witter Balanced Growth Fund
37.  Dean Witter Balanced Income Trust
 
    ASSET ALLOCATION FUNDS
 
38.  Dean Witter Strategist Fund
39.  Dean Witter Global Asset Allocation Fund
 
    FIXED INCOME FUNDS
 
40.  Dean Witter High Yield Securities Inc.
41.  Dean Witter High Income Securities
42.  Dean Witter Convertible Securities Trust
43.  Dean Witter Intermediate Income Securities
44.  Dean Witter Short-Term Bond Fund
45.  Dean Witter World Wide Income Trust
46.  Dean Witter Global Short-Term Income Fund Inc.
47.  Dean Witter Diversified Income Trust
48.  Dean Witter U.S. Government Securities Trust
49.  Dean Witter Federal Securities Trust
50.  Dean Witter Short-Term U.S. Treasury Trust
51.  Dean Witter Intermediate Term U.S. Treasury Trust
52.  Dean Witter Tax-Exempt Securities Trust
53.  Dean Witter National Municipal Trust
55.  Dean Witter Limited Term Municipal Trust
55.  Dean Witter California Tax-Free Income Fund
56.  Dean Witter New York Tax-Free Income Fund
57.  Dean Witter Hawaii Municipal Trust
58.  Dean Witter Multi-State Municipal Series Trust
59.  Dean Witter Select Municipal Reinvestment Fund
 
                                       8
<PAGE>
    SPECIAL PURPOSE FUNDS
 
60.  Dean Witter Retirement Series
61.  Dean Witter Variable Investment Series
62.  Dean Witter Select Dimensions Investment Series
 
    TCW/DW FUNDS
 
63.  TCW/DW Core Equity Trust
64.  TCW/DW North American Government Income Trust
65.  TCW/DW Latin American Growth Fund
66.  TCW/DW Income and Growth Fund
67.  TCW/DW Small Cap Growth Fund
68.  TCW/DW Balanced Fund
69.  TCW/DW Total Return Trust
70.  TCW/DW Global Telecom Trust
71.  TCW/DW Strategic Income Trust
72.  TCW/DW Mid-Cap Equity Trust
 
                                         By: __________________________________
                                             Barry Fink
                                             Vice President and General Counsel
 
ATTEST:
 
_____________________________
Assistant Secretary
 
                                         DEAN WITTER TRUST FSB
 
                                         By: __________________________________
                                             John Van Heuvelen
                                             President
 
ATTEST:
 
_____________________________
Executive Vice President
 
                                       9
<PAGE>
                                      EXHIBIT A

Dean Wittter Trust FSB
Harborside Financial Center, Plaza Two
Jersey City, NJ  07311

Gentlemen:

    The undersigned, Dean Witter (INSET NAME OF INVESTMENT COMPANY) a 
(Massachusetts business trust/Maryland corporation) (the "Fund"), desires to 
employ and appoint Dean Witter Trust FSB ("DWTFSB") to act as transfer agent 
for each series and class of shares of the Fund, whether now or hereafter 
authorized or issued ("Shares"), dividend disbursing agent and shareholder 
servicing agent, registrar and agent in connection with any accumulation, 
open-account or similar plan provided to the holders of Shares, including 
without limitation any periodic investment plan or periodic withdrawal plan.

    The Fund hereby agrees that, in consideration for the payment by the Fund
to DWTFSB of fees as set out in the fee schedule attached hereto as Schedule A,
DWTFSB shall provide such services to the Fund pursuant to the terms and
conditions set forth in the Transfer Agency and Service Agreement annexed
hereto, as if the Fund was a signatory thereto.

    Please indicate DWTFSB's acceptance of employment and appointment by the
Fund in the capacities set forth above by so indicating in the space provided
below.

                                       Very truly yours,
                                        (NAME OF FUND)


                                  By:
                                     --------------
                                      Barry Fink
                                      Vice President and 
                                       General Counsel

ACCEPTED AND AGREED TO:
DEAN WITTER TRUST FSB
By:      
   ---------------------------

Its:                         
    --------------------------

Date:                        
     -------------------------


                                       10

<PAGE>

                                      SCHEDULE A


Fund:         Dean Witter U.S. Government Money Market Trust

Fees:         (1)  Annual maintenance fee of $15.00* per shareholder account,
              payable monthly.

              (2)  A fee equal to 1/12 of the fee set forth in (1) above, for
              providing Forms 1099 for accounts closed during the year, payable
              following the end of the calendar year.

              (3)  Out-of-pocket expenses in accordance with Section 2.2 of the
              Agreement.

              (4)  Fees for additional services not set forth in this Agreement
              shall be as negotiated between the parties.

              Note:* Actual fee rate will be waived to $9.50 for the first 
              50,000 accounts and $5.00 per account above 50,000 accounts.


f:\schedA.2



<PAGE>


                                                        



CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the use in the Prospectus constituting part of this 
Post-Effective Amendment No. 18 to the registration statement on Form N-1A 
(the "Registration Statement") of our report dated February 18, 1998, 
relating to the financial statements and financial highlights of Dean Witter 
U.S. Government Money Market Trust, which appears in such Prospectus, and to 
the incorporation by reference of our report into the Statement of Additional 
Information which constitutes part of this Registration Statement. We also 
consent to the reference to us under the heading "Financial Highlights" in 
such Prospectus and to the references to us under the headings "Independent 
Accountants" and "Experts" in such Statement of Additional Information.



/s/ Price Waterhouse LLP
- ----------------------------
PRICE WATERHOUSE LLP
1177 Avenue of the Americas
New York, New York 10036
February 18, 1998



<PAGE>

                AMENDED AND RESTATED PLAN OF DISTRIBUTION PURSUANT TO RULE 12b-1
                                          OF
                    DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

     WHEREAS, Dean Witter U.S. Government Money Market Trust (the "Fund") is
engaged in business as an open-end management investment company and is
registered as such under the Investment Company Act of 1940, as amended (the
"Act"); and

     WHEREAS, on January 4, 1993, the Fund most recently amended and restated a
Plan and Agreement of Distribution pursuant to Rule 12b-1 under the Act which
had initially been adopted on February 3, 1982, and the Trustees then
determined that there was a reasonable likelihood that the Plan of
Distribution, as then amended and restated, would benefit the Fund and its
shareholders; and

     WHEREAS, the Trustees believe that continuation of said Plan of
Distribution, as amended and restated herein, is reasonably likely to
continue to benefit the Fund and its shareholders; and

     WHEREAS, the Agreement incorporated in said initial Plan and Agreement of
Distribution was entered into by the Fund with Dean Witter Reynolds Inc.
("DWR"); and

     WHEREAS, on January 4, 1993, the Fund and DWR substituted Dean Witter
Distributors Inc. (the "Distributor") in the place of DWR as distributor of
the Fund's shares; and

     WHEREAS, the Fund, DWR and the Distributor intend that DWR will continue
to promote the sale of Fund shares and provide personal services to Fund
shareholders with respect to their holdings of Fund shares; and

     WHEREAS, the Fund and the Distributor have entered into a separate
Distribution Agreement dated as of May 31, 1997, pursuant to which the Fund
has employed the Distributor in such capacity during the continuous offering
of shares of the Fund.

     NOW, THEREFORE, the Fund hereby amends and restates the Plan of
Distribution previously adopted and amended and restated, and the Distributor
hereby agrees to the terms of said Plan of Distribution (the "Plan"), as
amended and restated herein, in accordance with Rule 12b-1 under the Act on
the following terms and conditions:

     1. The Fund is hereby authorized to utilize its assets to finance certain
activities in connection with the distribution of its shares.

     2. Subject to the supervision of the Trustees and the terms of the
Distribution Agreement, the Distributor is authorized to promote the
distribution of the Fund's shares and to provide related services through
DWR, its affiliates or other broker-dealers it may select, and its own
Registered Representatives. The Distributor, DWR, its affiliates and said
broker-dealers shall be reimbursed, directly or through the Distributor, as
it may direct, as provided in paragraph 4 hereof for their services and
expenses, which may include one or more of the following: (1) compensation
to, and expenses of, account executives and other employees, including
overhead and telephone expenses; (2) sales incentives and bonuses to sales
representatives of the Distributor, DWR, its affiliates and other
broker-dealers, and to marketing personnel in connection with promoting sales
of shares of the Fund; (3) expenses incurred in connection with promoting
sales of shares of the Fund; (4) preparing and distributing sales literature;
and (5) providing advertising and promotional activities, including direct
mail solicitation and television, radio, newspaper, magazine and other media
advertisements.

     3. The Distributor hereby undertakes to directly bear all costs of
rendering the services to be performed by it under this Plan and under the
Distribution Agreement, except for those specific expenses that the Trustees
determine to reimburse as hereinafter set forth.

     4. The Fund is hereby authorized to reimburse the Distributor, DWR, its
affiliates and other broker-dealers for incremental distribution expenses
incurred by them specifically on behalf of the Fund. Reimbursement will be
made through payments at the end of each month. The amount of each monthly
payment may in no event exceed an amount equal to a payment at the annual
rate of 0.15 of 1% of the Fund's average net assets during the month. In the
case of all expenses other than expenses representing

<PAGE>

a residual to account executives, such amounts shall be determined at the
beginning of each calendar quarter by the Trustees, including a majority of
the Trustees who are not "interested persons" of the Fund, as defined in the
Act. Expenses representing a residual to account executives may be reimbursed
without prior determination. In the event that the Distributor proposes that
monies shall be reimbursed for other than such expenses, then in making the
quarterly determinations of the amounts that may be expended by the Fund, the
Distributor shall provide, and the Trustees shall review, a quarterly budget
of projected incremental distribution expenses to be incurred by the
Distributor, DWR, its affiliates or other broker-dealers on behalf of the
Fund, together with a report explaining the purposes and anticipated benefits
of incurring such expenses. The Trustees shall determine the particular
expenses, and the portion thereof, that may be borne by the Fund, and in
making such determination shall consider the scope of the Distributor's
commitment to promoting the distribution of the shares of the Fund directly
or through DWR, its affiliates or other broker-dealers.

     5. The Distributor may direct that all or any part of the amounts
receivable by it under this Plan be paid directly to DWR, its affiliates or
other broker-dealers.

     6. If, as of the end of any calendar year, the actual expenses incurred by
the Distributor, DWR, its affiliates and other broker-dealers on behalf of
the Fund (including accrued expenses and amounts reserved for incentive
compensation and bonuses) are less than the amount of payments made by the
Fund pursuant to this Plan, the Distributor shall promptly make appropriate
reimbursement to the Fund. If, however, as of the end of any calendar year,
the actual expenses of the Distributor, DWR, its affiliates and other
broker-dealers are greater than the amount of payments made by the Fund
pursuant to this Plan, the Fund will not reimburse the Distributor, DWR, its
affiliates or other broker-dealers for such expenses through payments accrued
pursuant to this Plan in the subsequent calendar year.

     7. The Distributor shall provide to the Trustees of the Fund and the
Trustees shall review, promptly after the end of each calendar quarter, a
written report regarding the incremental distribution expenses incurred by
the Distributor, DWR, its affiliates or other broker-dealers on behalf of the
Fund during such calendar quarter, which report shall include: (1) an
itemization of the types of expenses and the purposes therefor; (2) the
amounts of such expenses; and (3) a description of the benefits derived by
the Fund.

     8. This Plan, as amended and restated, shall become effective upon
approval by a vote of the Trustees of the Fund, and of the Trustees who are
not "interested persons" of the Fund, as defined in the Act, and who have no
direct or indirect financial interest in the operation of this Plan, cast in
person at a meeting called for the purpose of voting on this Plan.

     9. This Plan shall continue in effect until April 30, 1998 and from year
to year thereafter, provided such continuance is specifically approved at
least annually in the manner provided for approval of this Plan in paragraph
8 hereof. This Plan may not be amended to increase materially the amount to
be spent for the services described herein unless such amendment is approved
by a vote of at least a majority of the outstanding voting securities of the
Fund, as defined in the Act, and no material amendment to this Plan shall be
made unless approved in the manner provided for approval in paragraph 8
hereof.

     10. This Plan may be terminated at any time, without the payment of any
penalty, by vote of a majority of the Trustees who are not "interested
persons" of the Fund, as defined in the Act, and who have no direct or
indirect financial interest in the operation of this Plan or by a vote of a
majority of the outstanding voting securities of the Fund, as defined in the
Act, on no more than thirty days' written notice to any other party to this
Plan.

     11. While this Plan is in effect, the selection and nomination of Trustees
who are not interested persons of the Fund shall be committed to the
discretion of the Trustees who are not interested persons.

     12. The Fund shall preserve copies of this Plan and all reports made
pursuant to paragraph 7 hereof, for a period of not less than six years from
the date of this Plan, as amended and restated herein, or any such report, as
the case may be, the first two years in an easily accessible place.

     13. This Plan shall be construed in accordance with the laws of the State
of New York and the applicable provisions of the Act. To the extent the
applicable law of the State of New York, or any of the provisions herein,
conflicts with the applicable provisions of the Act, the latter shall
control.


                                          2
<PAGE>

     14. The Declaration of Trust establishing Dean Witter U.S. Government
Money Market Trust, dated November 18, 1981, a copy of which, together with
all amendments thereto (the "Declaration"), is on file in the office of the
Secretary of the Commonwealth of Massachusetts, provides that the name Dean
Witter U.S. Government Money Market Trust refers to the Trustees under the
Declaration collectively as Trustees, but not as individuals or personally;
and no Trustee, shareholder, officer, employee or agent of Dean Witter U.S.
Government Money Market Trust shall be held to any personal liability, nor
shall resort be had to their private property for the satisfaction of any
obligation or claim or otherwise, in connection with the affairs of said Dean
Witter U.S. Government Money Market Trust, but the Trust Estate only shall be
liable.

     IN WITNESS WHEREOF, the Fund, the Distributor and DWR have executed this
Plan of Distribution, as amended and restated, as of the day and year set
forth below in New York, New York.


Date: February 3, 1982                       DEAN WITTER U.S. GOVERNMENT MONEY
      As amended on March 21, 1983,          MARKET TRUST
      January 4, 1993 and July 23, 1997


                                             By:
                                                --------------------------------

Attest:


       ----------------------------          DEAN WITTER DISTRIBUTORS INC.



                                             By:

                                                --------------------------------
Attest:


       ----------------------------          DEAN WITTER REYNOLDS INC.


                                             By:
                                                --------------------------------

Attest:


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


                                          3

<PAGE>

                                                                   Exhibit 99.16



       DEAN WITTER US GOVERNMENT MONEY MARKET TRUST

       Exhibit 16:  Schedule for computation of each performance
       quotation provided in the Statement of Additional Information.


(18)   The Trust's current yield for the seven days ending
       January 31, 1998

        (A-B)   x   365/N

        (1.000932 -1)  x  365/7    =    4.86%

       The Trust's effective annualized yield for the seven days ending
       January 31, 1998

          365/N
       A            - 1

          365/7
       1.000932     - 1            =    4.98%

       A =  Value of  a share of the Trust at end of period.
       B =  Value of  a share of the Trust at beginning of period.
       N =  Number of days in the  period.
<PAGE>
                 SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                           DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST


(A)        GROWTH OF $10,000
(B)        GROWTH OF $50,000
(C)        GROWTH OF $100,000


FORMULA:   G= (TR+1)*P
           G= GROWTH OF INITIAL INVESTMENT
           P= INITIAL INVESTMENT
           TR= TOTAL RETURN SINCE INCEPTION 


<TABLE>
<CAPTION>
INVESTED - P      TOTAL
$10,000, $50,000  RETURN - TR          (A)   GROWTH OF        (B)   GROWTH OF             (C)   GROWTH OF
$100,000          31-Jan-98            $10,000 INVESTMENT- G  $50,000 INVESTMENT- G       $100,000 INVESTMENT- G
- -----------       -----------          ---------------------  ---------------------       ----------------------
<S>               <C>                  <C>                    <C>                         <C>
 17-Feb-82           157.36               $25,736                    $128,680                   $257,360
</TABLE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
<SERIES>
   <NUMBER> 01
   <NAME> DEAN WITTER US GOV'T MONEY MARKET TRUST
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JAN-31-1998
<PERIOD-START>                             FEB-01-1997
<PERIOD-END>                               JAN-31-1998
<INVESTMENTS-AT-COST>                      898,375,307
<INVESTMENTS-AT-VALUE>                     898,375,307
<RECEIVABLES>                                  585,436
<ASSETS-OTHER>                                 299,300
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             899,260,043
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    8,688,757
<TOTAL-LIABILITIES>                          8,688,757
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   890,569,126
<SHARES-COMMON-STOCK>                      890,569,126
<SHARES-COMMON-PRIOR>                      927,082,675
<ACCUMULATED-NII-CURRENT>                        2,160
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               890,571,286
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           49,850,300
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               9,140,965
<NET-INVESTMENT-INCOME>                     40,709,335
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       40,709,335
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (40,709,121)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                  2,013,452,444
<NUMBER-OF-SHARES-REDEEMED>            (2,090,526,682)
<SHARES-REINVESTED>                         40,560,689
<NET-CHANGE-IN-ASSETS>                    (36,513,335)
<ACCUMULATED-NII-PRIOR>                          1,946
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        4,108,339
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              9,140,965
<AVERAGE-NET-ASSETS>                       898,566,329
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                  0.046
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                           (0.046)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   1.02
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<PAGE>
                               POWER OF ATTORNEY
 
    KNOW ALL MEN BY THESE PRESENTS, that WAYNE E. HEDIEN, whose signature
appears below, constitutes and appoints David M. Butowsky, Ronald Feiman and
Stuart Strauss, or any of them, his true and lawful attorneys-in-fact and
agents, with full power of substitution among himself and each of the persons
appointed herein, for him and in his name, place and stead, in any and all
capacities, to sign any amendments to any registration statement of ANY OF THE
DEAN WITTER FUNDS SET FORTH ON SCHEDULE A ATTACHED HERETO, and to file the same,
with all exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, as fully to all intents and purposes as he
might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, may lawfully do or cause to be
done by virtue hereof.

Dated: September 1, 1997

                                                   /s/ WAYNE E. HEDIEN
                                          --------------------------------------
                                                     Wayne E. Hedien

97nyc12127
<PAGE>
                                   SCHEDULE A

<TABLE>
<C>        <S>
       1.  Active Assets Money Trust
       2.  Active Assets Tax-Free Trust
       3.  Active Assets Government Securities Trust
       4.  Active Assets California Tax-Free Trust
       5.  Dean Witter New York Municipal Money Market Trust
       6.  Dean Witter American Value Fund
       7.  Dean Witter Tax-Exempt Securities Trust
       8.  Dean Witter Tax-Free Daily Income Trust
       9.  Dean Witter Capital Growth Securities
      10.  Dean Witter U.S. Government Money Market Trust
      11.  Dean Witter Precious Metals and Minerals Trust
      12.  Dean Witter Developing Growth Securities Trust
      13.  Dean Witter World Wide Investment Trust
      14.  Dean Witter Value-Added Market Series
      15.  Dean Witter Utilities Fund
      16.  Dean Witter Strategist Fund
      17.  Dean Witter California Tax-Free Daily Income Trust
      18.  Dean Witter Convertible Securities Trust
      19.  Dean Witter Intermediate Income Securities
      20.  Dean Witter World Wide Income Trust
      21.  Dean Witter S&P 500 Index Fund
      22.  Dean Witter U.S. Government Securities Trust
      23.  Dean Witter Federal Securities Trust
      24.  Dean Witter Multi-State Municipal Series Trust
      25.  Dean Witter California Tax-Free Income Fund
      26.  Dean Witter New York Tax-Free Income Fund
      27.  Dean Witter Select Municipal Reinvestment Fund
      28.  Dean Witter Variable Investment Series
      29.  High Income Advantage Trust
      30.  High Income Advantage Trust II
      31.  High Income Advantage Trust III
      32.  InterCapital Insured Municipal Bond Trust
      33.  InterCapital Insured Municipal Trust
      34.  InterCapital Insured Municipal Income Trust
      35.  InterCapital Quality Municipal Investment Trust
      36.  InterCapital Quality Municipal Income Trust
      37.  Dean Witter Government Income Trust
      38.  Municipal Income Trust
      39.  Municipal Income Trust II
      40.  Municipal Income Trust III
      41.  Municipal Income Opportunities Trust
      42.  Municipal Income Opportunities Trust II
      43.  Municipal Income Opportunities Trust III
      44.  Municipal Premium Income Trust
      45.  Prime Income Trust
      46.  Dean Witter Short-Term U.S. Treasury Trust
      47.  Dean Witter Diversified Income Trust
      48.  InterCapital California Insured Municipal Income Trust
      49.  Dean Witter Health Sciences Trust
      50.  Dean Witter Global Dividend Growth Securities
      51.  InterCapital Quality Municipal Securities
</TABLE>
 
97nyc12127
<PAGE>
<TABLE>
<C>        <S>
      52.  InterCapital California Quality Municipal Securities
      53.  InterCapital New York Quality Municipal Securities
      54.  Dean Witter Retirement Series
      55.  Dean Witter Limited Term Municipal Trust
      56.  Dean Witter Short-Term Bond Fund
      57.  Dean Witter Global Utilities Fund
      58.  InterCapital Insured Municipal Securities
      59.  InterCapital Insured California Municipal Securities
      60.  Dean Witter High Income Securities
      61.  Dean Witter National Municipal Trust
      62.  Dean Witter International SmallCap Fund
      63.  Dean Witter Mid-Cap Growth Fund
      64.  Dean Witter Select Dimensions Investment Series
      65.  Dean Witter Global Asset Allocation Fund
      66.  Dean Witter Balanced Growth Fund
      67.  Dean Witter Balanced Income Fund
      68.  Dean Witter Intermediate Term U.S. Treasury Trust
      69.  Dean Witter Hawaii Municipal Trust
      70.  Dean Witter Japan Fund
      71.  Dean Witter Capital Appreciation Fund
      72.  Dean Witter Information Fund
      73.  Dean Witter Fund of Funds
      74.  Dean Witter Special Value Fund
      75.  Dean Witter Income Builder Fund
      76.  Dean Witter Financial Services Trust
      77.  Dean Witter Market Leader Trust
      78.  Dean Witter Managers' Select Fund
      79.  Dean Witter Liquid Asset Fund Inc.
      80.  Dean Witter Natural Resource Development Securities Inc.
      81.  Dean Witter Dividend Growth Securities Inc.
      82.  Dean Witter European Growth Fund Inc.
      83.  Dean Witter Pacific Growth Fund Inc.
      84.  Dean Witter High Yield Securities Inc.
      85.  Dean Witter Global Short-Term Income Fund Inc.
      86.  InterCapital Income Securities Inc.
</TABLE>

97nyc12127


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