DEAN WITTER U S GOVERNMENT MONEY MARKET TRUST
485BPOS, 1997-03-18
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 18, 1997
 
                                                     REGISTRATION NOS.:  2-74980
                                                                        811-3326
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       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. 17                      /X/
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
                                AMENDMENT NO. 18                             /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)
 
       ____ immediately upon filing pursuant to paragraph (b)
       _X_ on March 19, 1997 pursuant to paragraph (b)
       ____ 60 days after filing pursuant to paragraph (a)
       ____ on (date) pursuant to paragraph (a) of rule 485.
 
    THE  REGISTRANT HAS REGISTERED AN INDEFINITE  NUMBER OF ITS SHARES UNDER THE
SECURITIES ACT  OF 1933  PURSUANT TO  SECTION  (A)(1) OF  RULE 24F-2  UNDER  THE
INVESTMENT  COMPANY ACT OF 1940. THE REGISTRANT HAS FILED THE RULE 24F-2 NOTICE,
FOR ITS FISCAL  YEAR ENDED JANUARY  31, 1997, WITH  THE SECURITIES AND  EXCHANGE
COMMISSION ON MARCH 4, 1997.
 
           AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS
 
            -------------------------------------------------------
            -------------------------------------------------------
<PAGE>
                 DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
ITEM                                               CAPTION
- ------------------------------------------------------------------------------------------
<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 19, 1997
    
 
              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 19, 1997, 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 DISTRIBUTORS INC.
      DISTRIBUTOR
 
    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/12
Dividends, Distributions and Taxes/14
Additional Information/15
Financial Statements--January 31, 1997/17
Report of Independent Accountants/24
    
 
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
    U.S. Government Money Market Trust
    Two World Trade Center
    New York, New York 10048
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
   
<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.
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Offered      Shares of beneficial interest of $0.01 par value (see page 15).
- ------------------------------------------------------------------------------------------------------------------------------------
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).
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          To provide security of principal, high current income and liquidity (see page 5).
Objectives
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          A diversified portfolio of U.S. Government securities with short-term maturities (see page 5).
Policy
- ------------------------------------------------------------------------------------------------------------------------------------
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 102 investment companies and other portfolios with assets of approximately $93 billion at February
                    28, 1997 (see page 4).
- ------------------------------------------------------------------------------------------------------------------------------------
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).
- ------------------------------------------------------------------------------------------------------------------------------------
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).
- ------------------------------------------------------------------------------------------------------------------------------------
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 8).
- ------------------------------------------------------------------------------------------------------------------------------------
Dividends           Declared and automatically reinvested daily in additional shares; cash payments of dividends available monthly
                    (see page 14).
- ------------------------------------------------------------------------------------------------------------------------------------
Reports             Individual periodic account statements; annual and semi-annual Trust financial statements.
- ------------------------------------------------------------------------------------------------------------------------------------
Redemption          Shares are redeemable at net asset value without any charge (see pages 12-14):
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).
- ------------------------------------------------------------------------------------------------------------------------------------
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>
    
 
  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, 1997.
    
 
<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..........................   0.55%
Total Fund Operating Expenses...........   1.11%
<FN>
- ------------
* 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>
    
 
   
<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:.........................................................   $      11    $      35    $      61    $     135
</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 17.
    
 
   
<TABLE>
<CAPTION>
                                                                 FOR THE YEAR ENDED JANUARY 31,
                               --------------------------------------------------------------------------------------------------
                                 1997      1996      1995      1994      1993      1992      1991      1990      1989      1988
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
<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.........    0.043     0.049     0.034     0.023     0.029     0.050     0.070     0.082     0.068     0.058
Less dividends from net
 investment income............   (0.043)   (0.049)   (0.034)   (0.023)   (0.029)   (0.050)   (0.070)   (0.082)   (0.068)   (0.058)
                               --------  --------  --------  --------  --------  --------  --------  --------  --------  --------
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+......    4.41%     5.00%     3.47%     2.28%     2.89%     5.14%     7.20%     8.59%     7.02%     5.90%
RATIOS TO AVERAGE NET ASSETS:
Expenses......................    1.11%     1.09%     1.08%     1.00%     0.93%     0.89%     0.99%     0.83%     0.87%     0.85%
Net investment income.........    4.29%     4.86%     3.38%     2.23%     2.87%     5.02%     6.97%     8.19%     6.77%     5.85%
SUPPLEMENTAL DATA:
Net assets, end of period, in
 millions.....................     $927      $903      $809      $818    $1,027    $1,115    $1,217      $873      $661      $636
</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  Dean  Witter,  Discover  & Co.
("DWDC"), a balanced financial services organization providing a broad range  of
nationally marketed credit and investment products.
 
   
    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 102  investment companies,  thirty of
which are listed on the New York  Stock Exchange, with combined total assets  of
approximately  $89.8 billion at  February 28, 1997.  The Investment Manager also
manages portfolios of  pension plans, other  institutions and individuals  which
aggregated approximately $3.2 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 Trust's  general investment policies and
programs are being properly carried out and that
administra-
 
                                       4
<PAGE>
tive services are being provided to the Trust in a satisfactory manner.
 
   
    On February 5, 1997, DWDC and Morgan Stanley Group Inc. announced that  they
had  entered into an Agreement and Plan  of Merger, with the combined company to
be named Morgan  Stanley, Dean  Witter, Discover &  Co. The  business of  Morgan
Stanley  Group Inc. and  its affiliated companies  is providing a  wide range of
financial services  for sovereign  governments, corporations,  institutions  and
individuals  throughout the world. DWDC is the direct parent of InterCapital and
Dean  Witter  Distributors  Inc.,  the  Trust's  distributor.  It  is  currently
anticipated   that  the   transaction  will   close  in   mid-1997.  Thereafter,
InterCapital and Dean Witter  Distributors Inc. will  be direct subsidiaries  of
Morgan Stanley, Dean Witter, Discover & Co.
    
 
   
    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, 1997, 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  1.11% 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
docu-
 
                                       5
<PAGE>
mentary 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 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, usually  not more than  seven days  from the date  of purchase.  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.
 
                                       6
<PAGE>
    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  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.
 
    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.
 
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 Company (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
 
                                       7
<PAGE>
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 Company, Harborside Financial Center, Plaza Two, 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. Subsequent investments must be $50  or
more  and  may be  made through  the Transfer  Agent. The  Trust will  waive the
minimum initial investment for the automatic reinvestment of distributions  from
certain  Unit  Investment Trusts.  The Trust  reserves 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.
 
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
tele-
 
                                       8
<PAGE>
   
phone 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,  1997,
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 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 Dean Witter
 
                                       9
<PAGE>
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  various Dean  Witter  Funds which  are  open-end investment
companies sold with either a front-end (at time of purchase) sales charge ("FESC
funds") or a contingent  deferred sales charge ("CDSC  funds") 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, Dean Witter  Balanced Growth Fund, Dean  Witter Balanced Income Fund
and Dean  Witter Intermediate  Term  U.S. Treasury  Trust (which  eleven  funds,
including  the  Trust, are  referred to  herein as  the "Exchange  Funds"). When
exchanging into a money market fund from an FESC fund or a CDSC fund, shares  of
the  FESC fund or the CDSC 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  from an FESC fund or a  CDSC
fund  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. Subsequently, shares of the  Exchange Fund received in an exchange
for shares of an FESC fund (regardless of the type of fund originally purchased)
may be redeemed and exchanged for shares of the other Exchange Funds, FESC funds
or CDSC  funds (however,  shares of  CDSC funds,  including shares  acquired  in
exchange for (i) shares of FESC funds or (ii) shares of the Exchange Funds which
were  acquired in exchange  for shares of  FESC funds, may  not be exchanged for
shares of FESC funds). Additionally, shares of the Exchange Funds received in an
exchange for shares of a  CDSC fund (regardless of  the type of fund  originally
purchased)  may be redeemed and exchanged for shares of the other Exchange Funds
or CDSC  funds.  Ultimately, any  applicable  contingent deferred  sales  charge
("CDSC")  will have  to be paid  upon redemption of  shares originally purchased
from  a   CDSC  fund.   (If   shares  of   the   Exchange  Funds   received   in
 
                                       10
<PAGE>
   
exchange  for shares  originally purchased  from a  CDSC fund  are exchanged for
shares of another CDSC fund  having a different schedule  than that of the  CDSC
fund  from which  the Exchange  Funds shares were  acquired, the  shares will be
subject to  the higher  CDSC schedule.)  During the  period of  time the  shares
originally  purchased from a  CDSC fund 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 CDSC fund,
the holding period previously frozen when the first exchange was made resumes on
the last day of the month in which  shares of a CDSC fund are reacquired.  Thus,
the  CDSC is based upon the time (calculated as described above) the shareholder
was invested in a CDSC  fund. However, 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  Funds  Prospectuses for  a description  of Exchange  Fund distribution
fees). Exchanges involving FESC funds or CDSC funds may be made after the shares
of the FESC fund or CDSC 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.
 
   
    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 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, TCW/DW North American Government
Income Trust, TCW/ DW Income and  Growth Fund and TCW/DW Balanced Fund  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.
 
                                       11
<PAGE>
    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 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 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
signa-
 
                                       12
<PAGE>
ture 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
 
3.  BY MAIL
 
    A  shareholder may redeem  shares by sending  a letter to  Dean Witter Trust
Company, 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  contingent
deferred  sales charge 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  Company,
P.O. Box 983, Jersey City, NJ 07303.
 
                                       13
<PAGE>
    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 Trust
ees.
 
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.
 
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.
 
                                       14
<PAGE>
    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 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, 1997  was 3.93%. The effective  annual yield on 3.93%  is
4.01%,  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
Massa-
 
                                       15
<PAGE>
chusetts 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.
 
   
    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.
    
 
                                       16
<PAGE>
 
<TABLE>
<S>                   <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
                        2       3       0       --
                      for office use only
</TABLE>
 
                                                                  [LOGO]
APPLICATION
 
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
Send to: Dean Witter Trust Company (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>
INSTRUCTIONS      For assistance in completing this application, telephone Dean Witter Trust Company at (800) 869-NEWS (toll-free).
TO REGISTER
SHARES             1.
(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)
                                                                                                   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>
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)
 
<CAPTION>
TO PURCHASE
Minimum Initial
Investment:
$1,000
 
<CAPTION>
SHARES:
</TABLE>
<TABLE>
<S>                     <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 Company
 
<CAPTION>
</TABLE>
<TABLE>
<S>                     <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
 
<CAPTION>
 
<CAPTION>
</TABLE>
<TABLE>
<S>                  <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 ]        -
 
<CAPTION>
 
<CAPTION>
 
<CAPTION>
</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>
                            /  /    Dean Witter  Trust  Company is  hereby  authorized  to honor  telephonic  or other
PAYMENT TO                  instructions, without signature guarantee,  from any person for  the redemption of any  or
PREDESIGNATED                    all shares of Dean Witter U.S. Government Money Market Trust held in my (our) account
BANK 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 Company (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
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)
 
<CAPTION>
 
PAYMENT TO
PREDESIGNATED
BANK ACCOUNT
 
Bank Account must be in
same  name  as  shares  ar
registered
                              BANK'S ROUTING TRANSMIT
                                       CODE
                                  (ASK YOUR BANK)
Minimum Amount:
$1,000
 
FOR ALL ACCOUNTS
 
</TABLE>
 
<TABLE>
<S>                   <C>                                                <C>
Name(s) must be
signed exactly the
same as shown on
lines 1 to 4 on the
reverse side of this
application
                          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.
                                         FOR CORPORATIONS, TRUSTS, PARTNERSHIPS AND OTHER ORGANIZATIONS
                      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>
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
                                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.
 
<CAPTION>
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
 
<CAPTION>
In addition, complete
</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 at which a quorum
SIGN ABOVE AND COM-   was present throughout, the Board of Directors of the corporation/the officers of the  association
PLETE THIS            duly adopted a resolution, which is in full force and effect and in accordance with the Registered
SECTION               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>
DEALER                          Above signature(s) guaranteed. Prospectus has been delivered
                                by undersigned to above-named applicant(s).
(if any)
Completion by dealer only
                                Firm Name
                                Address
                                City, State, Zip Code
 
<CAPTION>
DEALER
(if any)
Completion by dealer only
                                Office Number-Account Number at Dealer-A/E Number
                                Account Executive's Last Name
                                Branch Office
</TABLE>
 
   
- -Registered Trademark- 1997 Dean Witter Distributors Inc.
    
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
PORTFOLIO OF INVESTMENTS JANUARY 31, 1997
 
   
<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 (98.4%)
 $ 122,470   Federal Farm Credit Bank 02/07/97-07/31/97................    5.22-5.40%  $   120,832,566
   352,405   Federal Home Loan Banks 02/03/97-07/07/97.................    5.28-5.44       348,965,152
   189,700   Federal Home Loan Mortgage Corp.
               02/04/97-04/04/97.......................................    5.28-5.45       188,738,916
   188,460   Federal National Mortgage Assoc.
               02/03/97-07/21/97.......................................    5.26-5.65       186,012,709
    47,505   Student Loan Marketing Assoc.
               02/24/97-03/21/97.......................................    5.24-5.27        47,273,804
    20,000   Tennessee Valley Authority 04/09/97.......................         5.33        19,804,956
                                                                                       ---------------
             TOTAL U.S. GOVERNMENT AGENCIES
             (AMORTIZED COST $911,628,103)...........................................      911,628,103
                                                                                       ---------------
 
             U.S. GOVERNMENT OBLIGATION (0.5%)
     5,000   U.S. Treasury Bill (Amortized Cost $4,996,274) 02/06/97...         5.52         4,996,274
                                                                                       ---------------
             REPURCHASE AGREEMENTS (1.7%)
    13,000   Dillon Read & Co., Inc. due 02/03/97 (dated 01/31/97;
               proceeds $13,005,958; collateralized by $12,250,000 U.S.
               Treasury Bond 7.50% due 11/15/16 valued at $13,260,625)
               (Identified Cost $13,000,000)...........................         5.50        13,000,000
                                                                                       ---------------
     2,987   The Bank of New York due 02/03/97 (dated 01/31/97;
               proceeds $2,987,807; collateralized by $4,363,475 U.S.
               Treasury Strip 0.00% due 11/15/02 valued at $3,046,231)
               (Identified Cost $2,986,501)............................         5.25         2,986,501
                                                                                       ---------------
TOTAL REPURCHASE AGREEMENTS
(IDENTIFIED COST $15,986,501)..............                 15,986,501
                                                          ------------
TOTAL INVESTMENTS
(IDENTIFIED COST $932,610,878) (A).........       100.6%   932,610,878
 
LIABILITIES IN EXCESS OF CASH AND OTHER
ASSETS.....................................        (0.6)    (5,526,257)
                                                  -----   ------------
NET ASSETS.................................       100.0%  $927,084,621
                                                  -----   ------------
                                                  -----   ------------
<FN>
- ---------------------
(a)  Cost is the same for federal income tax purposes.
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       17
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
JANUARY 31, 1997
 
   
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $932,610,878)............................  $932,610,878
Cash........................................................        89,901
Receivable for:
    Shares of beneficial interest sold......................       347,440
    Interest................................................         2,422
Prepaid expenses and other assets...........................        89,392
                                                              ------------
 
     TOTAL ASSETS...........................................   933,140,033
                                                              ------------
 
LIABILITIES:
Payable for:
    Shares of beneficial interest repurchased...............     5,011,735
    Investment management fee...............................       359,080
    Plan of distribution fee................................        78,815
Accrued expenses and other payables.........................       605,782
                                                              ------------
 
     TOTAL LIABILITIES......................................     6,055,412
                                                              ------------
 
NET ASSETS:
Paid-in-capital.............................................   927,082,675
Accumulated undistributed net investment income.............         1,946
                                                              ------------
 
     NET ASSETS.............................................  $927,084,621
                                                              ------------
                                                              ------------
 
NET ASSET VALUE PER SHARE,
  927,082,675 SHARES OUTSTANDING (UNLIMITED SHARES
  AUTHORIZED OF $.01 PAR VALUE).............................
                                                                     $1.00
                                                              ------------
                                                              ------------
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       18
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED JANUARY 31, 1997
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME.............................................  $49,586,539
                                                              -----------
 
EXPENSES
Transfer agent fees and expenses............................    4,716,932
Investment management fee...................................    4,190,754
Plan of distribution fee....................................      879,924
Shareholder reports and notices.............................      194,134
Registration fees...........................................       77,425
Custodian fees..............................................       58,104
Professional fees...........................................       52,037
Trustees' fees and expenses.................................       16,625
Other.......................................................        8,142
                                                              -----------
 
     TOTAL EXPENSES.........................................   10,194,077
                                                              -----------
 
     NET INVESTMENT INCOME AND NET INCREASE.................  $39,392,462
                                                              -----------
                                                              -----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       19
<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, 1997   JANUARY 31, 1996
- -------------------------------------------------------------------------------------------------
<S>                                                           <C>                <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income and net increase......................    $   39,392,462     $   42,906,083
Dividends from net investment income........................       (39,391,745)       (42,906,345)
Net increase from transactions in shares of beneficial
  interest..................................................        24,364,860         93,226,032
                                                              ----------------   ----------------
 
     NET INCREASE...........................................        24,365,577         93,225,770
 
NET ASSETS:
Beginning of period.........................................       902,719,044        809,493,274
                                                              ----------------   ----------------
 
     END OF PERIOD
    (INCLUDING UNDISTRIBUTED NET INVESTMENT INCOME OF $1,946
    AND $1,229, RESPECTIVELY)...............................    $  927,084,621     $  902,719,044
                                                              ----------------   ----------------
                                                              ----------------   ----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       20
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 1997
 
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 the
daily net assets exceeding $1 billion but not exceeding $1.5
    
 
                                       21
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 1997, CONTINUED
 
   
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 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
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, 1997, the distribution fee was accrued at the annual rate of 0.10%.
    
 
                                       22
<PAGE>
DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 1997, CONTINUED
 
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, 1997 aggregated $12,548,196,296 and
$12,575,267,370, respectively.
    
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Trust's transfer agent. At January 31, 1997, the Trust had
transfer agent fees and expenses payable of approximately $513,000.
 
   
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, 1997 included
in Trustees' fees and expenses in the Statement of Operations amounted to $851.
At January 31, 1997, the Trust had an accrued pension liability of $47,889 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,
                                                                        1997              1996
                                                                   ---------------   ---------------
<S>                                                                <C>               <C>
Shares sold......................................................    1,937,077,890     1,866,242,509
Shares issued in reinvestment of dividends.......................       39,246,217        42,762,335
                                                                   ---------------   ---------------
                                                                     1,976,324,107     1,909,004,844
Shares repurchased...............................................   (1,951,959,247)   (1,815,778,812)
                                                                   ---------------   ---------------
Net increase.....................................................       24,364,860        93,226,032
                                                                   ---------------   ---------------
                                                                   ---------------   ---------------
</TABLE>
 
6. SELECTED PER SHARE DATA AND RATIOS
 
See the "Financial Highlights" table on page 4 of this Prospectus.
 
                                       23
<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, 1997, 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, 1997 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
MARCH 6, 1997
 
                                       24
<PAGE>
 
   
Dean Witter                         Dean Witter
U. S. Government                    U.S. Government
Money Market Trust
Two World Trade Center              Money Market
New York, New York 10048
TRUSTEES                            Trust
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
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 Company
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.
                                           PROSPECTUS -- MARCH 19, 1997
 
    
<PAGE>
STATEMENT OF ADDITIONAL INFORMATION
 
   
MARCH 19, 1997                                               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  19, 1997, 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...............................................................         15
Redemption of Trust Shares.............................................................         23
Dividends, Distributions and Taxes.....................................................         24
Shares of the Trust....................................................................         26
Custodian and Transfer Agent...........................................................         26
Independent Accountants................................................................         27
Reports to Shareholders................................................................         27
Legal Counsel..........................................................................         27
Experts................................................................................         27
Registration Statement.................................................................         27
Financial Statements...................................................................         27
</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, 1997, 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. The Investment Manager, which was
incorporated  in  July,  1992,  is a  wholly-owned  subsidiary  of  Dean Witter,
Discover & Co. ("DWDC"), 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 periodic  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  Premier Income  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  High
Income  Securities,  Dean Witter  National Municipal  Trust, 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.
 
                                       3
<PAGE>
   
Treasury  Trust, Dean Witter  Japan Fund, Dean Witter  Income Builder Fund, Dean
Witter Special Value  Fund, Dean  Witter Financial Services  Trust, Dean  Witter
Market  Leader  Trust, 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 Core Equity
Trust, 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
Balanced Fund, TCW/DW Mid-Cap Equity Trust, TCW/DW Global Telecom Trust, TCW/ DW
Strategic  Income  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)
sub-adviser to  Templeton Global  Opportunities  Trust, an  open-end  investment
company;  (ii)  administrator  of The  BlackRock  Strategic Term  Trust  Inc., a
closed-end  investment  company;  and  (iii)  sub-administrator  of   MassMutual
Participation   Investors  and   Templeton  Global   Governments  Income  Trust,
closed-end investment companies.
    
 
    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. The expenses borne by the Trust 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
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
 
                                       4
<PAGE>
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, 1995, 1996  and 1997, the  Trust accrued to  the Investment Manager
total compensation of $3,716,376, $4,061,755 and $4,190,754, 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 October 30, 1992 and
by  the shareholders of the  Trust at a Meeting  of Shareholders held on January
12, 1993.  The  Agreement  is  substantially identical  to  a  prior  investment
management agreement which was initially approved by the Trustees on January 18,
1983  and by the shareholders of the Trust  at a Meeting of Shareholders held on
March 18, 1983. The Agreement took effect on June 30, 1993 upon the spin-off  by
Sears,  Roebuck and Co.  of its remaining  shares of DWDC.  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 had an initial term ending April 30, 1994 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. At  their  meeting  held on  April  17,  1996, the  Trust's  Board  of
Trustees,  including all of  the Independent Trustees,  approved continuation of
the Agreement until April 30, 1997.
    
 
   
    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 84 Dean Witter Funds and the 14 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 (56)                          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* (63)                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 Company  ("DWTC");  Director  and/or officer  of  various  DWDC
                                            subsidiaries;  formerly Director and Executive Vice President of DWDC
                                            (until February, 1993).
 
Edwin J. Garn (64)                          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 (since  January, 1993);  Director of
                                            Franklin Quest  (time management  systems) and  John Alden  Financial
                                            Corp.  (health insurance); member  of the board  of various civic and
                                            charitable organizations.
 
John R. Haire (72)                          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);  Director  of  Washington  National
                                            Corporation (insurance).
</TABLE>
    
 
                                       6
<PAGE>
   
<TABLE>
<CAPTION>
NAME, AGE, POSITION WITH TRUST AND ADDRESS              PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------  ---------------------------------------------------------------------
<S>                                         <C>
Dr. Manuel H. Johnson (48)                  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);  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 (60)                      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* (53)                     Chairman of the  Board of  Directors and Chief  Executive Officer  of
Trustee                                     DWDC,  DWR and Novus Credit  Services Inc.; Director of InterCapital,
Two World Trade Center                      DWSC and Distributors; Director or Trustee of the Dean Witter  Funds;
New York, New York                          Director and/or officer of various DWDC subsidiaries.
 
John L. Schroeder (66)                      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)  and  Chairman and
Counsel to the Independent Trustees         Chief  Investment  Officer  of  Axe-  Houghton  Management  and   the
114 West 47th Street                        Axe-Houghton Funds (1983-1991).
New York, New York
 
Barry Fink (42)                             First  Vice President  (since June,  1993) and  Secretary and General
Vice President, Secretary and               Counsel (since February, 1997) of  InterCapital and DWSC; First  Vice
General Counsel                             President,  Assistant  Secretary  and  Assistant  General  Counsel of
Two World Trade Center                      Distributors (since  February,  1997);  Assistant  Secretary  of  DWR
New York, New York                          (since  August, 1996); Vice President,  Secretary and General Counsel
                                            of the  Dean Witter  Funds and  the TCW/  DW Funds  (since  February,
                                            1997);  previously Vice President,  Assistant Secretary and Assistant
                                            General Counsel of InterCapital and  DWSC and Assistant Secretary  of
                                            the Dean Witter Funds and the TCW/DW Funds.
 
Jonathan R. Page (48)                       Senior Vice President of InterCapital; Vice President of various Dean
Vice President                              Witter Funds.
Two World Trade Center
New York, New York
</TABLE>
    
 
                                       7
<PAGE>
   
<TABLE>
<CAPTION>
NAME, AGE, POSITION WITH TRUST AND ADDRESS              PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------  ---------------------------------------------------------------------
<S>                                         <C>
Thomas F. Caloia (51)                       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 DWTC  and
Director  of  DWTC,  Joseph J.  McAlinden,  Executive Vice  President  and Chief
Investment Officer of InterCapital  and Director of  DWTC, Robert S.  Giambrone,
Senior  Vice President of InterCapital, DWSC, Distributors and DWTC and Director
of DWTC, Peter  M. Avelar,  Paul D.  Vance and  James F.  Willison, Senior  Vice
Presidents   of  InterCapital,  and   Patricia  A.  Cuddy,   Vice  President  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 and  Ruth Rossi, Vice  Presidents and Assistant  General Counsels  of
InterCapital  and DWSC, and Frank Bruttomesso  and Carsten Otto, 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 eight (8) 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 84 Dean Witter Funds, comprised  of
127  portfolios. As of  February 28, 1997,  the Dean Witter  Funds had total net
assets of approximately $84.2 billion and more than five million shareholders.
    
 
   
    Six Trustees  (75% 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, DWDC. These
are the "disinterested" or "independent"  Trustees. The other two Trustees  (the
"management  Trustees")  are  affiliated  with  InterCapital.  Four  of  the six
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, 1996,
the three Committees held a combined  total of sixteen 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.
    
 
   
    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.
    
 
                                       8
<PAGE>
   
    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, since July
1, 1996, 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 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 $1,000 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
    
 
                                       9
<PAGE>
   
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). 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 31,1997.
    
 
   
                               TRUST COMPENSATION
    
 
   
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                     FROM THE TRUST
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,800
Edwin J. Garn.................................................       1,800
John R. Haire.................................................       3,650
Dr. Manuel H. Johnson.........................................       1,750
Michael E. Nugent.............................................       1,800
John L. Schroeder.............................................       1,750
</TABLE>
    
 
   
    The following  table  illustrates  the  compensation  paid  to  the  Trust's
Independent  Trustees for the calendar year ended December 31, 1996 for services
to the 82 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, 1996.
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.
    
 
   
           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       82 DEAN
                             COMMITTEE MEMBER     TRUSTEE AND          AUDIT            AUDIT          WITTER
                                OF 82 DEAN      COMMITTEE MEMBER   COMMITTEES OF    COMMITTEES OF     FUNDS AND
NAME OF                           WITTER          OF 14 TCW/DW     82 DEAN WITTER     14 TCW/DW       14 TCW/DW
INDEPENDENT TRUSTEE               FUNDS              FUNDS             FUNDS            FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
Michael Bozic..............      $138,850           --                 --               --            $138,850
<S>                          <C>                <C>                <C>              <C>             <C>
Edwin J. Garn..............       140,900           --                 --               --             140,900
John R. Haire..............       106,400           $64,283           $195,450        $ 12,187         378,320
Dr. Manuel H. Johnson......       137,100            66,483            --               --             203,583
Michael E. Nugent..........       138,850            64,283            --               --             203,133
John L. Schroeder..........       137,150            69,083            --               --             206,233
</TABLE>
    
 
   
    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
    
 
                                       10
<PAGE>
   
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,
1997 and by the 57  Dean Witter Funds (including the  Trust) for the year  ended
December  31,  1996,  and  the estimated  retirement  benefits  for  the Trust's
Independent Trustees, to commence  upon their retirement, from  the Trust as  of
January 31, 1997 and from the 57 Dean Witter Funds as of December 31, 1996.
    
 
   
          RETIREMENT BENEFITS FROM THE TRUST AND ALL DEAN WITTER FUNDS
    
 
   
<TABLE>
<CAPTION>
                                       FOR ALL ADOPTING FUNDS
                                     ---------------------------                         ESTIMATED ANNUAL
                                      ESTIMATED                    RETIREMENT BENEFITS       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%       $    339     $20,147  $  875  $ 51,325
Edwin J. Garn......................       10           50.0             475      27,772     875    51,325
John R. Haire......................       10           50.0            (404)(3)  46,952   2,211   129,550
Dr. Manuel H. Johnson..............       10           50.0             203      10,926     875    51,325
Michael E. Nugent..................       10           50.0             339      19,217     875    51,325
John L. Schroeder..................        8           41.7             647      38,700     729    42,771
</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
    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, the Trust may enter
into repurchase  agreements  with  financial  institutions.  The  Trust  follows
certain  procedures designed to minimize the  risks inherent in such agreements.
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
    
 
                                       11
<PAGE>
   
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 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 Trust does not believe that its net asset value
or  income  will  be adversely  affected  by  its purchase  of  securities  on a
when-issued or delayed delivery basis.
 
                                       12
<PAGE>
    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;
 
        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;
 
                                       13
<PAGE>
        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.
 
    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. 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.
 
                                       14
<PAGE>
    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, 1995, 1996 and 1997.
    
 
    Consistent with  the  policy  described  above,  brokerage  transactions  in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected  through DWR. In order for DWR to effect any portfolio transactions for
the Trust, the commissions, fees or  other remuneration received by DWR 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 DWR 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  DWR are  consistent with  the
foregoing standard. The Trust has never paid any brokerage commissions to DWR.
 
    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  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 DWDC, 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 October  30, 1992,  the  current
 
                                       15
<PAGE>
   
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. The Distribution Agreement took effect on June
30, 1993 upon the spin-off by Sears, Roebuck and Co. of its remaining shares  of
DWDC.  By its terms, the Distribution Agreement had an initial term ending April
30, 1994, and will remain in effect from year to year thereafter if approved  by
the  Board.  At their  meeting  held on  April 17,  1996,  the Trust's  Board of
Trustees, including all  of the Independent  Trustees, approved continuation  of
the Distribution Agreement until April 30, 1997.
    
 
    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 Company  (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 reserves the  right to reject  any order for  the purchase of  its
shares. In addition, the offering of shares of the Trust may be suspended at any
time and resumed at any time thereafter.
 
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 sold with either  a front-end sales charge ("FESC funds")
or a contingent deferred  sales charge ("CDSC funds")  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,  Dean  Witter Balanced  Growth Fund,  Dean  Witter
Balanced  Income  Fund and  Dean Witter  Intermediate  Term U.S.  Treasury Trust
(these eleven 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. Subsequently,  shares  of the
Exchange Funds received in an exchange for shares of an FESC fund (regardless of
the type of fund originally purchased) may be redeemed and exchanged for  shares
of  the other Exchange Funds, FESC funds  or CDSC funds (however, shares of CDSC
funds, including shares  acquired in exchange  for (i) shares  of FESC funds  or
(ii)  shares of the Exchange Funds which were acquired in exchange for shares of
FESC funds, may not be exchanged for shares of FESC funds). Additionally, shares
of the Exchange Funds received in exchange for shares of a CDSC fund (regardless
of the type  of fund  originally purchased) may  be redeemed  and exchanged  for
shares  of the  other Exchange Funds  or CDSC funds.  Ultimately, any applicable
contingent deferred sales charge ("CDSC") will  have to be paid upon  redemption
of shares originally purchased from a CDSC fund. 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.
 
                                       16
<PAGE>
    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 any CDSC  fund 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 Funds (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 Funds, they  will be subject to a CDSC which  would
be  based upon the  period of time the  shareholder held shares  in a CDSC fund.
However, in the case of shares of a CDSC fund 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 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 CDSC fund 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 CDSC  fund are  reacquired. A CDSC  is imposed  only upon  an
ultimate  redemption, based  upon the time  (calculated as  described above) the
shareholder was invested  in a  CDSC fund.  Shares of  a CDSC  fund acquired  in
exchange  for shares of  an FESC fund (or  in exchange for  shares of other Dean
Witter Funds  for which  shares of  a FESC  fund have  been exchanged)  are  not
subject to any CDSC upon their redemption.
 
    When  shares initially purchased in a CDSC  fund are exchanged for shares of
another CDSC fund or for 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 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  FESC funds, or for
shares of other  Dean Witter  Funds for  which shares  of FESC  funds have  been
exchanged  (all  such shares  called "Free  Shares"),  will be  exchanged first.
Shares of Dean  Witter American  Value Fund acquired  prior to  April 30,  1984,
shares  of Dean Witter  Dividend Growth Securities Inc.  and Dean Witter Natural
Resource Development Securities Inc. acquired prior to July 2, 1984, and  shares
of  Dean Witter  Strategist Fund  acquired prior  to November  8, 1989  are also
considered Free Shares and will be the first Free Shares to be exchanged.  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
 
                                       17
<PAGE>
   
Shares. Based upon the exchange procedures described in the CDSC fund 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.
 
    The current prospectus for each  fund describes its investment  objective(s)
and  policies, and  shareholders should obtain  a copy and  examine it carefully
before investing. 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. 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.
 
    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 Account may not thereafter  be
placed  back  into that  Account.  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 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 is $5,000 for Dean Witter Special
Value Fund. The  minimum initial  investment for 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
    
 
                                       18
<PAGE>
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, TCW/DW North American Government Income Trust, TCW/DW Income
and Growth Fund and  TCW/DW Balanced Fund 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
 
    In accordance with a Plan of  Distribution pursuant to Rule 12b-1 under  the
Act  between the  Trust and  the Distributor,  the Distributor  provides certain
services and finances certain activities in connection with the distribution  of
Trust  shares (the "Plan" refers to the Plan and Agreement of Distribution prior
to the reorganization described above and to the Plan of Distribution after  the
reorganization).  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
Plan  was initially  approved by  the Trustees  on January  18, 1983  and by the
Trust's shareholders on March 17, 1983. The vote of which in each case was  cast
in person at a meeting called for the purpose of voting on such Plan, included a
majority  of the Trustees who are  not and were not at  the time of their voting
interested persons of the Trust (as defined in the Act) and who have and had  at
the  time  of  their votes  no  direct  or indirect  financial  interest  in the
operation of the Plan (the "Independent 12b-1 Trustees").
 
    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.  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 a  majority of the  outstanding
voting securities of the Trust (as defined in the Act) on not more than 30 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  Trustees is  committed to the
discretion of the Independent 12b-1 Trustees.
 
    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  the  reorganization described  above,  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 being 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
 
                                       19
<PAGE>
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.
 
   
    Pursuant  to the Plan the  Trustees were provided, at  their meeting held on
April 17, 1996, with all the  information the Trustees deemed necessary to  make
an  informed determination  on whether the  Plan should be  continued. In making
their determination to  continue the Plan  until April 30,  1997, the  Trustees,
including  all of  the Independent  12b-1 Trustees,  unanimously arrived  at the
conclusion that the Plan had benefitted the Trust and also unanimously concluded
that, in their  judgment, there is  a reasonable likelihood  that the Plan  will
continue to benefit the Trust and its shareholders.
    
 
    The  Plan provides that 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 under the Plan:  (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 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.
 
    DWR  account executives are paid an  annual residual commission, currently a
gross residual of up to  0.10% of the current  value of the respective  accounts
for  which they are the account executives  of record. The "gross residual" is a
charge which reflects residual commissions paid by DWR to its account executives
and DWR's  expenses  associated  with the  servicing  of  shareholder  accounts,
including  the expenses of operating DWR's branch offices in connection with the
servicing of  shareholder  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 is authorized to  reimburse the Distributor for specific  expenses
incurred  or to be incurred in promoting the distribution of the Trust's shares.
Reimbursement is made through monthly payments in amounts determined in  advance
of  each fiscal quarter by the Trustees, including a majority of the Independent
Trustees. 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 will be
incurred for which reimbursements under the  Plan will be made. In addition,  no
interest charges, if any, incurred on any distribution expense incurred pursuant
to   the  Plan  will  be  reimbursable  under  the  Plan.  In  making  quarterly
determinations of the amounts that may be expended by the Trust, the Distributor
provides and the  Trustees 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  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 Trust accrued $879,924 to the  Distributor pursuant to the Plan for  its
fiscal  year ended January 31,  1997. This is 0.10 of  1% of the Trust's average
daily net assets  for its fiscal  year ended  January 31, 1997.  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 --
$879,924.
    
 
                                       20
<PAGE>
    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 fiscal  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.
 
   
    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 and Agreement except to
the extent that the Distributor, DWR, DWSC or the Investment Manager, 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 currently
observes the following holidays: New  Year's 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
 
                                       21
<PAGE>
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 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.
 
                                       22
<PAGE>
    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 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
 
                                       23
<PAGE>
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.
 
    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 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 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.
 
    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.
 
                                       24
<PAGE>
    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. 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.
 
    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.
 
    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, 1997 was
3.93%. The effective annual yield on 3.93% is 4.01%, 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 $24,588, $122,940 and $245,880, respectively, at January 31, 1997.
    
 
                                       25
<PAGE>
SHARES OF THE TRUST
- --------------------------------------------------------------------------------
 
    The shareholders of  the Trust are  entitled to  a full vote  for each  full
share  held.  All  of  the  Trustees,  except  for  Messrs.  Bozic,  Purcell and
Schroeder, have been elected by the shareholders of the Trust, most recently  at
a  Special  Meeting of  Shareholders held  on January  12, 1993.  Messrs. Bozic,
Purcell and Schroeder were elected by the  other Trustees of the Trust on  April
8,  1994. 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.
 
   
    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 Company,  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  Company 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
Company'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 Company receives a per shareholder account fee from the Trust.
    
 
                                       26
<PAGE>
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.
 
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, 1997, and the report of the independent accountants thereon, are set
forth in the Trust's Prospectus, and are incorporated herein by reference.
    
 
                                       27
<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,
          1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
          1996 and 1997 .........................................   4

          Portfolio of Investments at January 31, 1997...........   17

          Statement of Assets and Liabilities at January 31,
          1997...................................................   18

          Statement of Operations for the year ended January
          31, 1997...............................................   19

          Statement of Changes in Net Assets for the years
          ended January 31, 1996 and January 31, 1997 ...........   20

          Notes to Financial Statements..........................   21

      (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 25, 1996.

          8. -  Amendment to Custody Agreement between the Registrant
                and The Bank of New York

         11. -  Consent of Independent Accountants

         16. -  Schedules for Computation of Performance
                Quotations

         27. -  Financial Data Schedule

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



<PAGE>


          All other exhibits were previously filed 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 February 28, 1997
     --------------                  ------------------------

Shares of Beneficial Interest                   275,359

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


                                        2
<PAGE>


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 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 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


                                        3
<PAGE>


 (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

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 Premier Income Trust
(32) Dean Witter Short-Term U.S. Treasury Trust
(33) Dean Witter Diversified Income Trust
(34) Dean Witter U.S. Government Money Market Trust
(35) Dean Witter Global Dividend Growth Securities


                                        4
<PAGE>


(36) Active Assets California Tax-Free Trust
(37) Dean Witter Natural Resource Development Securities Inc.
(38) Active Assets Government Securities Trust
(39) Active Assets Money Trust
(40) Active Assets Tax-Free Trust
(41) Dean Witter Limited Term Municipal Trust
(42) Dean Witter Variable Investment Series
(43) Dean Witter Value-Added Market Series
(44) Dean Witter Global Utilities Fund
(45) Dean Witter High Income Securities
(46) Dean Witter National Municipal Trust
(47) Dean Witter International SmallCap Fund
(48) Dean Witter Mid-Cap Growth Fund
(49) Dean Witter Select Dimensions Investment Series
(50) Dean Witter Balanced Growth Fund
(51) Dean Witter Balanced Income Fund
(52) Dean Witter Hawaii Municipal Trust
(53) Dean Witter Capital Appreciation Fund
(54) Dean Witter Intermediate Term U.S. Treasury Trust
(55) Dean Witter Information Fund
(56) Dean Witter Japan Fund
(57) Dean Witter Income Builder Fund
(58) Dean Witter Special Value Fund
(59) Dean Witter Financial Services Trust
(60) Dean Witter Market Leader Trust

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

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


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

Charles A. Fiumefreddo        Executive Vice President and Director of Dean
Chairman, Chief               Witter Reynolds Inc. ("DWR"); Chairman, Chief
Executive Officer and         Executive Officer and Director of Dean Witter
Director                      Distributors Inc. ("Distributors") and Dean
                              Witter Services Company Inc. ("DWSC"); Chairman
                              and Director of Dean Witter Trust Company
                              ("DWTC"); 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; Formerly Executive
                              Vice President and Director of Dean Witter,
                              Discover & Co. ("DWDC"); Director and/or officer
                              of various DWDC subsidiaries.


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

Richard M. DeMartini          Executive Vice President of DWDC; President and
Director                      Chief Operating Officer of Dean Witter Capital;
                              Director of DWR, DWSC, Distributors and DWTC;
                              Trustee of the TCW/DW Funds; Member (since
                              January, 1993) and Chairman (since January,
                              1995) of the Board of Directors of NASDAQ.

James F. Higgins              Executive Vice President of DWDC; President and
Director                      Chief Operating Officer of Dean Witter Financial;
                              Director of DWR, DWSC, Distributors and DWTC.

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

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

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 DWTC;
                              Vice President of the Dean Witter Funds and the
                              TCW/DW Funds.


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

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

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

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

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

Richard Felegy
Senior Vice President

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

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

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

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

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

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

John B. Kemp, III             Director of the Provident Savings Bank, Jersey
Senior Vice President         City, New Jersey.

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

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

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


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

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

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

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

Elizabeth A. Vetell
Senior Vice President

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

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

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
Treasurer                     Dean Witter Funds and the TCW/DW Funds.

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.

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

Robert Zimmerman
First Vice President

Joan Allman
Vice President

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


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

Kirk Balzer
Vice President                Vice President of various Dean Witter Funds.

Douglas Brown
Vice President

Philip Casparius
Vice President

Thomas Chronert
Vice President

Rosalie Clough
Vice President

Patricia A. Cuddy
Vice President                Vice President of various Dean Witter Funds.

B. Catherine Connelly
Vice President

Salvatore DeSteno
Vice President                Vice President of DWSC.

Frank J. DeVito
Vice President                Vice President of DWSC.

Bruce Dunn
Vice President

Jeffrey D. Geffen
Vice President

Deborah Genovese
Vice President

Peter W. Gurman
Vice President

John Hechtlinger
Vice President

Peter Hermann
Vice President                Vice President of various Dean Witter Funds.

Elizabeth Hinchman
Vice President

David Hoffman
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
- -----------------             ------------------------------------------------

David Johnson
Vice President

Christopher Jones
Vice President

James Kastberg
Vice President

Stanley Kapica
Vice President

Michael Knox
Vice President                Vice President of various Dean Witter Funds.

Konrad J. Krill
Vice President                Vice President of various Dean Witter Funds.

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

Thomas Lawlor
Vice President

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

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

Julie Morrone
Vice President

David Myers
Vice President

James Nash
Vice President

Richard Norris
Vice President

Anne Pickrell
Vice President                Vice President of Dean Witter Global Short-
                              Term Income Fund Inc.


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

Hugh Rose
Vice President

Robert Rossetti               Vice President of Dean Witter Precious Metals
Vice President                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

Rafael Scolari
Vice President                Vice President of Prime Income Trust.

Peter Seeley                  Vice President of Dean Witter World
Vice President                Wide Income Trust.

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

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

Vinh Q. Tran
Vice President                Vice President of various Dean Witter Funds.

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

Katherine Wickham
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
<PAGE>


(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
(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 Premier Income Trust
(43)       Dean Witter Value-Added Market Series
(44)       Dean Witter Global Utilities Fund
(45)       Dean Witter High Income Securities
(46)       Dean Witter National Municipal Trust
(47)       Dean Witter International SmallCap Fund
(48)       Dean Witter Balanced Growth Fund
(49)       Dean Witter Balanced Income Fund
(50)       Dean Witter Hawaii Municipal Trust
(51)       Dean Witter Variable Investment Series
(52)       Dean Witter Capital Appreciation Fund
(53)       Dean Witter Intermediate Term U.S. Treasury Trust
(54)       Dean Witter Information Fund
(55)       Dean Witter Japan Fund
(56)       Dean Witter Income Builder Fund
(57)       Dean Witter Special Value Fund
(58)       Dean Witter Financial Services Trust
(59)       Dean Witter Market Leader Trust
 (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


                                       12
<PAGE>


 (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

(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.




                                    Positions and
                                    Office with
Name                                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

        Not Applicable.


<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 17th day of March, 1997.

                              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. 17 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                                     03/17/97
    --------------------------
        Charles A. Fiumefreddo

(2) Principal Financial Officer    Treasurer and Principal
                                   Accounting Officer

By  /s/ Thomas F. Caloia                                           03/17/97
    --------------------------
        Thomas F. Caloia

(3) Majority of the Trustees

        Charles A. Fiumefreddo (Chairman)
        Philip J. Purcell

By  /s/ Barry Fink                                                 03/17/97
    --------------------------
        Barry Fink
        Attorney-in-Fact

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

By  /s/ David M. Butowsky                                          03/17/97
    --------------------------
        David M. Butowsky
        Attorney-in-Fact




<PAGE>


                 DEAN WITTER U. S. GOVERNMENT MONEY MARKET TRUST

                                  EXHIBIT INDEX

 2.   --      Amended and Restated By-Laws of the Registrant
              dated as of October 25, 1996

 8.   --      Amendment to the Custody Agreement between the
              Registrant and the Bank of New York

11.   --      Consent of Independent Accountants

16.   --      Schedules for Computation of Performance Quotations

27.   --      Financial Data Schedule




<PAGE>

                                   BY-LAWS

                                      OF

                DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

                 AMENDED AND RESTATED AS OF OCTOBER 25, 1996

                                  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 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. 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 the votes entitled to be cast at such meeting. Such request
shall state the purpose or purposes of such meeting and the matters proposed
to be acted on thereat. 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 power to adjourn the meeting from time to
time. Any adjourned meeting may be held as adjourned without further notice.
At any adjourned meeting at which a quorum shall be present, any business may
be transacted as if the meeting had been held 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 Corporations and Associations Law of
the State of Maryland.

   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.

                                  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

                                       2
<PAGE>

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 (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

                                        3
<PAGE>

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--

          (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.

                                        4
<PAGE>

   (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.

   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.

                                        5
<PAGE>

   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 of the Board , a President, one or more Vice Presidents, a
Secretary and a Treasurer. The Chairman of the Board shall be selected from
among the Trustees but none of the other executive officers need be a member
of the Board of Trustees. 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 Board of
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 Board of 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 Board of 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 its
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 Board of Trustees, or by the
President to the extent provided by the Board of 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
Board of 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 of the Board shall
preside at all meetings of the shareholders and of the Board of Trustees,
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 Board of Trustees
may from time to time prescribe.

   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.

                                        6
<PAGE>

   (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 Board of 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 Board of
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 Board of Trustees or the President.

   SECTION 6.10. THE SECRETARY. The Secretary shall attend all meetings of
the Board of Trustees and all meetings of the Shareholders and record all the
proceedings of the meetings of the Shareholders and of the Board of 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 Board
of Trustees, and shall perform such other duties and have such powers as the
Board of 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 Board of 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 Board of
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 Board of 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 Board of 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 Board of 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 Board of Trustees may deem it
desirable, the Board may delegate the powers and duties of an officer or
officer 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.

   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.

                                       7
<PAGE>

                                 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;

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
provided that in every case such sub-custodian shall be a bank or trust
company organized under the laws of the United States or one of the states
thereof and having capital, surplus and undivided profits of at least five
million dollars ($5,000,000).

                                      8
<PAGE>

   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 Shareholders entitled to notice
of, or to vote at, any meeting of Shareholders, or Shareholders entitled to
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. Such
date, in any case, shall be not more than ninety (90) days, and in case of a
meeting of Shareholders not less than ten (10) days, prior to the date on
which particular action requiring such determination of Shareholders is to be
taken. 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 such 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
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.

                                      9
<PAGE>

                                 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>


                         AMENDMENT TO CUSTODY AGREEMENT


     Amendment made as of this 17th day of April, 1996 by and between Dean
Witter U.S. Government Money Market Trust (the "Fund") and The Bank of New York
(the "Custodian") to the Custody Agreement between the Fund and the Custodian
dated September 20, 1991 (the "Custody Agreement") The Custody Agreement is
hereby amended as follows:

     Article XV Section 8 of the Custody Agreement shall be deleted and be
replaced by Sections 8.(a), 8.(b) and 8.(c) as set forth below:

     "8. (a) The Custodian will use reasonable care with respect to its
obligations under this Agreement and the safekeeping of Securities and moneys
owned by the Fund. The Custodian shall indemnify the Fund against and save the
Fund harmless from all liability, claims, losses and demands whatsoever,
including attorneys' fees, howsoever arising or incurred as the result of the
failure of a subcustodian which is a banking institution located in a foreign
country and identified on Schedule A attached hereto and as amended from time to
time upon mutual agreement of the parties (each, a "Subcustodian") to exercise
reasonable care with respect to the safekeeping of such Securities and moneys
to the same extent that the Custodian would be liable to the Fund if the
Custodian were holding such securities and moneys in New York.  In the event of
any loss to the Fund by reason of the failure of the Custodian or a Subcustodian
to utilize reasonable care, the Custodian shall be liable to the Fund only to
the extent of the Fund's direct damages, to be determined based on the market
value of the Securities and moneys which are the subject of the loss at the date
of discovery of such loss and without reference to any special conditions or
circumstances.

     8.   (b) The Custodian shall not be liable for any loss which results from
(i) the general risk of investing, or (ii) investing or holding Securities and
moneys in a particular country including, but not limited to, losses resulting
from nationalization, expropriation or other governmental actions; regulation of
the banking or securities industry; currency restrictions, devaluations or
fluctuations; or market conditions which prevent the orderly execution of
securities transactions or affect the value of Securities or moneys.

     8.   (c) Neither party shall be liable to the other for any loss due to
forces beyond its control including, but not limited to, strikes or work
stoppages, acts of war or terrorism, insurrection, revolution, nuclear fusion,
fission or radiation, or acts of God."

<PAGE>


          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their respective Officers, thereunto duly authorized and their
respective seals to be hereunto affixed, as of the day and year first above
written.


           DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST


[SEAL]                                  By
                                          ---------------------------------
Attest:

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

                                                  THE BANK OF NEW YORK



[SEAL]                                  By
                                          ---------------------------------


Attest:

- -------------------------------
<PAGE>



                                   SCHEDULE A


 COUNTRY/MARKET                              SUBCUSTODIAN
 --------------                              ------------

 Argentina                                   The Bank of Boston
 Australia                                   ANZ Banking Group Limited
 Austria                                     Girocredit Bank AG
 Bangladesh*                                 Standard Chartered Bank
 Belgium                                     Banque Bruxelles Lambert
 Botswana*                                   Stanbic Bank Botswana Ltd.
 Brazil                                      The Bank of Boston
 Canada                                      Royal Trust/Royal Bank of Canada
 Chile                                       The Bank of Boston/Banco de Chile
 China                                       Standard Chartered Bank
 Colombia                                    Citibank, N.A.
 Denmark                                     Den Danske Bank
 Euromarket                                  CEDEL
                                             Euroclear
                                             First Chicago Clearing Centre
 Finland                                     Union Bank of Finland
 France                                      Banque Paribas/Credit Commercial de
                                             France
 Germany                                     Dresdner Bank A.G.
 Ghana*                                      Merchant Bank Ghana Ltd.
 Greece                                      Alpha Credit Bank
 Hong Kong                                   Hong Kong and Shanghai Banking
                                             Corp.
 Indonesia                                   Hong Kong and Shanghai Banking
                                             Corp.
 Ireland                                     Allied Irish Bank
 Israel                                      Israel Discount Bank
 Italy                                       Banca Commerciale Italiana
 Japan                                       Yasuda Trust & Banking Co., Lt.
 Korea                                       Bank of Seoul
 Luxembourg                                  Kredietbank S.A.
 Malaysia                                    Hong Kong Bank Malaysia Berhad
 Mexico                                      Banco Nacional de Mexico (Banamex)
 Netherlands                                 Mees Pierson
 New Zealand                                 ANZ Banking Group Limited
 Norway                                      Den Norske Bank
 Pakistan                                    Standard Chartered Bank
 Peru                                        Citibank N.A.
 Phillipines                                 Hong Kong and Shanghai Banking
                                             Corp.
 Poland                                      Bank Handlowy W Warsawie
 Portugal                                    Banco Comercial Portugues
 Singapore                                   United Overseas Bank
 South Africa                                Standard Bank of South Africa
                                             Limited
 Spain                                       Banco Bilbao Vizcaya
 Sri Lanka                                   Standard Chartered Bank

<PAGE>


                                   SCHEDULE A

 COUNTRY/MARKET                              SUBCUSTODIAN
 --------------                              ------------

 Sweden                                      Skandinaviska Enskilda Banken
 Switzerland                                 Union Bank of Switzerland
 Taiwan                                      Hong Kong and Shanghai Banking
                                             Corp.
 Thailand                                    Siam Commercial Bank
 Turkey                                      Citibank, N.A.
 United Kingdom                              The Bank of New York
 United States                               The Bank of New York
 Uruguay                                     The Bank of Boston
 Venezuela                                   Citibank N.A.
 Zimbabwe*                                   Stanbic Bank Zimbabwe Ltd.




*Not yet 17 (f) 5 compliant


<PAGE>


CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the use in the Prospectus constituting part of this Post-
Effective Amendment No. 17 to the registration statement on Form N-1A (the
"Registration Statement") of our report dated March 6, 1997, relating to the
financial statements and financial highlights of Dean Witter U.S. Government
Money Market Trust, which are included in such Prospectus.  We also consent to
the references to us under the heading "Financial Highlights" in such Prospectus
and under the headings "Independent Accountants" and "Experts" in the Statement
of Additional Information constituting part of this Registration Statement.



/s/ PRICE WATERHOUSE LLP
PRICE WATERHOUSE LLP
1177 Avenue of the Americas
New York, New York 10036
March 13, 1997





<PAGE>


     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, 1997

     (A-B)   x   365/N

     (1.000754 -1)  x  365/7      =     3.93%

     The Trust's effective annualized yield for the seven days ending
     January 31, 1997

          365/N
     A                    - 1

                    365/7
     1.000754               - 1        =     4.01%

     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-97    $10,000 INVESTMENT- G   $50,000 INVESTMENT- G     $100,000 INVESTMENT- G
- -----------         -----------  ----------------------  ----------------------    ----------------------
<S>                 <C>          <C>                     <C>                       <C>
17-Feb-82           145.88       $24,588                 $122,940                  $245,880
</TABLE>



<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JAN-31-1997
<PERIOD-START>                             FEB-01-1996
<PERIOD-END>                               JAN-31-1997
<INVESTMENTS-AT-COST>                      932,610,878
<INVESTMENTS-AT-VALUE>                     932,610,878
<RECEIVABLES>                                  349,862
<ASSETS-OTHER>                                 179,293
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             933,140,033
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    6,055,412
<TOTAL-LIABILITIES>                          6,055,412
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   927,082,675
<SHARES-COMMON-STOCK>                      927,082,675
<SHARES-COMMON-PRIOR>                      902,717,815
<ACCUMULATED-NII-CURRENT>                        1,946
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               927,084,621
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           49,586,539
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              10,194,077
<NET-INVESTMENT-INCOME>                     39,392,462
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       39,392,462
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (39,391,745)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                  1,937,077,890
<NUMBER-OF-SHARES-REDEEMED>            (1,951,959,247)
<SHARES-REINVESTED>                         39,246,217
<NET-CHANGE-IN-ASSETS>                      24,365,577
<ACCUMULATED-NII-PRIOR>                          1,229
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        4,190,754
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             10,194,077
<AVERAGE-NET-ASSETS>                       917,534,044
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   .043
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (.043)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   1.11
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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