WITTER DEAN U S GOVERNMENT SECURITIES TRUST
485APOS, 1997-05-29
Previous: HORIZON BANCORP INC /WV/, 8-K, 1997-05-29
Next: ZITEL CORP, 8-K, 1997-05-29



<PAGE>
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 29, 1997
                                                      REGISTRATION NOS.  2-86966
                                                                        811-3870
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       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. 15                       /X/
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                 ACT OF 1940                                 /X/
                               AMENDMENT NO. 17                              /X/
                               ------------------
 
                        (CHECK APPROPRIATE BOX OR BOXES)
                                ----------------
 
                  DEAN WITTER U.S. GOVERNMENT SECURITIES 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)
        ___ on (date) pursuant to paragraph (b)
        ___ 60 days after filing pursuant to paragraph (a)
        _X_ on July 28, 1997 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 DECEMBER  31, 1996 WITH  THE SECURITIES AND  EXCHANGE
COMMISSION ON FEBRUARY 3, 1997.
 
                            AMENDING THE PROSPECTUS
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                  DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
ITEM                                                                           CAPTION
- ----------------------------------------------  ---------------------------------------------------------------------
<S>                                             <C>
PART A                                                                       PROSPECTUS
 1.  .........................................  Cover Page
 2.  .........................................  Prospectus Summary; Summary of Fund Expenses
 3.  .........................................  Financial Highlights; Report of Independent Accountants; Financial
                                                 Statements; Performance Information
 4.  .........................................  Investment Objective and Policies; The Fund and Its Management, Cover
                                                 Page; Investment Restrictions; Prospectus Summary; Financial
                                                 Highlights
 5.  .........................................  The Fund and Its Management; Back Cover; Investment Objective and
                                                 Policies
 6.  .........................................  Dividends, Distributions and Taxes; Additional Information
 7.  .........................................  Purchase of Fund Shares; Shareholder Services; Prospectus Summary
 8.  .........................................  Redemptions and Repurchases; Shareholder Services
 9.  .........................................  Not Applicable
 
PART B                                                           STATEMENT OF ADDITIONAL INFORMATION
10.  .........................................  Cover Page
11.  .........................................  Table of Contents
12.  .........................................  The Fund and Its Management
13.  .........................................  Investment Practices and Policies; Investment Restrictions; Portfolio
                                                 Transactions and Brokerage
14.  .........................................  The Fund and Its Management; Trustees and Officers
15.  .........................................  The Fund and Its Management; Trustees and Officers
16.  .........................................  The Fund and Its Management; The Distributor; Shareholder Services;
                                                 Custodian and Transfer Agent; Independent Accountants
17.  .........................................  Portfolio Transactions and Brokerage
18.  .........................................  Shares of the Fund
19.  .........................................  The Distributor; Redemptions and Repurchases; Financial Statements;
                                                 Determination of Net Asset Value; Shareholder Services
20.  .........................................  Dividends, Distributions and Taxes; Financial Statements
21.  .........................................  The Distributor
22.  .........................................  Performance Information
23.  .........................................  Experts; 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
              JULY 28, 1997
    
 
              Dean Witter U.S. Government Securities Trust (the "Fund") is an
open-end diversified management investment company whose investment objective is
high current income consistent with safety of principal. The Fund offers a
convenient and economical way for persons to invest in a professionally managed
diversified portfolio of obligations issued or guaranteed by the U.S. Government
or its instrumentalities. All such obligations are backed by the full faith and
credit of the United States. No assurance can be given that the Fund's objective
will be realized. Shares of the Fund are not sponsored, guaranteed, endorsed or
insured by the U.S. Government or any agency thereof.
 
   
               The Fund offers four classes of shares (each, a "Class"), each
with a different combination of sales charges, ongoing fees and other features.
The different distribution arrangements permit an investor to choose the method
of purchasing shares that the investor believes is most beneficial given the
amount of the purchase, the length of time the investor expects to hold the
shares and other relevant circumstances. Except as discussed herein, shares of
the Fund held prior to July 28, 1997 have been designated Class B shares. See
"Purchase of Fund Shares--Alternative Purchase Arrangements."
    
 
   
               This Prospectus sets forth concisely the information you should
know before investing in the Fund. It should be read and retained for future
reference. Additional information about the Fund is contained in the Statement
of Additional Information, dated July 28, 1997, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
    
 
     DEAN WITTER DISTRIBUTORS INC.
      DISTRIBUTOR
 
      TABLE OF CONTENTS
 
   
Prospectus Summary/2
Summary of Fund Expenses/4
Financial Highlights/6
The Fund and its Management/7
Investment Objective and Policies/7
  Risk Considerations/11
Purchase of Fund Shares/13
Shareholder Services/23
Redemptions and Repurchases/25
Dividends, Distributions and Taxes/26
Performance Information/27
Additional Information/28
    
 
SHARES OF THE FUND 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 Securities Trust
    Two World Trade Center
    New York, New York 10048
    (212) 392-2550 or
    (800) 869-NEWS (toll-free)
    
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>              <C>
The              The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is
Fund             an open-end diversified management investment company investing in obligations issued or
                 guaranteed by the U.S. Government.
- ----------------------------------------------------------------------------------------------------------
Shares Offered   Shares of beneficial interest with $0.01 par value (see page 28). The Fund offers four
                 Classes of shares, each with a different combination of sales charges, ongoing fees and
                 other features (see pages 13-22).
- ----------------------------------------------------------------------------------------------------------
Minimum          The minimum initial investment for each Class is $1,000 ($100 if the account is opened
Purchase         through EasyInvestSM). Class D shares are only available to persons investing $5 million
                 or more and to certain other limited categories of investors. For the purpose of meeting
                 the minimum $5 million investment for Class D shares, and subject to the $1,000 minimum
                 initial investment for each Class of the Fund, an investor's existing holdings of Class A
                 shares and concurrent investments in Class D shares of the Fund and other multiple class
                 funds for which Dean Witter InterCapital Inc. serves as investment manager will be
                 aggregated. The minimum subsequent investment is $100 (see page 13).
- ----------------------------------------------------------------------------------------------------------
Investment       The investment objective of the Fund is high current income consistent with safety of
Objective        principal.
- ----------------------------------------------------------------------------------------------------------
Investment       Dean Witter InterCapital Inc., the Investment Manager of the Fund, and its wholly-owned
Manager          subsidiary, Dean Witter Services Company Inc., serve in various investment management,
                 advisory, management and administrative capacities to 102 investment companies and other
                 portfolios with assets of approximately $  billion at June 30, 1997 (see page 7).
- ----------------------------------------------------------------------------------------------------------
Management       The Investment Manager receives a monthly fee at the annual rate of 0.50% (1/2 of 1%) of
Fee              daily net assets, scaled down on assets over $1 billion. The fee should not be compared
                 with fees paid by other investment companies without also considering applicable sales
                 loads and distribution fees, including those noted below (see page 7).
- ----------------------------------------------------------------------------------------------------------
Distributor      Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution
and              plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with
Distribution     respect to the distribution fees paid by the Class A, Class B and Class C shares of the
Fee              Fund to the Distributor. The entire 12b-1 fee payable by Class A and a portion of the
                 12b-1 fee payable by each of Class B and Class C equal to 0.25% of the average daily net
                 assets of each of Class A and Class C and 0.20% of the average daily net assets of Class B
                 is characterized as a service fee within the meaning of the National Association of
                 Securities Dealers, Inc. guidelines. The remaining portion of the 12b-1 fee, if any, is
                 characterized as an asset-based sales charge (see page 21).
- ----------------------------------------------------------------------------------------------------------
Alternative      Four classes of shares are offered:
Purchase
Arrangements     - Class A shares are offered with a front-end sales charge, starting at 4.25% and reduced
                 for larger purchases. Investments of $1 million or more (and investments by certain other
                 limited categories of investors) are not subject to any sales charge at the time of
                 purchase but a contingent deferred sales charge ("CDSC") of 1.0% may be imposed on
                 redemptions within one year of purchase. The Fund is authorized to reimburse the
                 Distributor for specific expenses incurred in promoting the distribution of the Fund's
                 Class A shares pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an
                 amount equal to payments at an annual rate of 0.25% of average daily net assets of the
                 Class (see pages 13, 14 and 16).
</TABLE>
    
 
                                       2
<PAGE>
   
<TABLE>
<S>              <C>
                 - Class B shares are offered without a front-end sales charge, but will in most cases be
                 subject to a CDSC (scaled down from 5.0% to 1.0%) if redeemed within six years after
                 purchase. The CDSC will be imposed on any redemption of shares if after such redemption
                 the aggregate current value of a Class B account with the Fund falls below the aggregate
                 amount of the investor's purchase payments made during the six years preceding the
                 redemption. A different CDSC schedule applies to investments by certain qualified plans.
                 Class B shares are also subject to a 12b-1 fee assessed at the annual rate of 0.75% (0.65%
                 on amounts over $10 billion) of the lesser of: (a) the average daily net sales of the
                 Fund's Class B shares or (b) the average daily net assets of Class B. All shares of the
                 Fund held prior to July 28, 1997 (other than the shares held by certain employee benefit
                 plans established by Dean Witter Reynolds Inc. and its affiliate, SPS Transaction
                 Services, Inc.) have been designated Class B shares. Shares held by those employee benefit
                 plans prior to July 28, 1997 have been designated Class D shares. Shares held before May
                 1, 1997 that have been designated Class B shares will convert to Class A shares in May,
                 2007. In all other instances, Class B shares convert to Class A shares approximately ten
                 years after the date of the original purchase (see pages 13, 14 and 18).
 
                 - Class C shares are offered without a front-end sales charge, but will in most cases be
                 subject to a CDSC of 1.0% if redeemed within one year after purchase. The Fund is
                 authorized to reimburse the Distributor for specific expenses incurred in promoting the
                 distribution of the Fund's Class C shares pursuant to the Fund's 12b-1 Plan. Reimbursement
                 may in no event exceed an amount equal to payments at an annual rate of 0.75% of average
                 daily net assets of the Class (see pages 13, 14 and 20).
 
                 - Class D shares are offered only to investors meeting an initial investment minimum of $5
                 million and to certain other limited categories of investors. Class D Shares are offered
                 without a front-end sales charge or CDSC and are not subject to any 12b-1 fee (see pages
                 13, 14 and 20).
- ----------------------------------------------------------------------------------------------------------
Dividends        Dividends from net investment income are declared daily and paid monthly and distributions
and              from net capital gains, if any, are paid at least once per year. The Fund may, however,
Capital Gains    determine to retain all or part of any net long-term capital gains in any year for
Distributions    reinvestment. Dividends and capital gains distributions paid on shares of a Class are
                 automatically reinvested in additional shares of the same Class at net asset value unless
                 the shareholder elects to receive cash. Shares acquired by dividend and distribution
                 reinvestment will not be subject to any sales charge or CDSC (see page 27).
- ----------------------------------------------------------------------------------------------------------
Redemption       Shares are redeemable by the shareholder at net asset value less any applicable CDSC on
                 Class A, Class B or Class C shares. An account may be involuntarily redeemed if the total
                 value of the account is less than $100 or, if the account was opened through EasyInvestSM,
                 if after twelve months the shareholder has invested less than $1,000 in the account (see
                 pages 25-26).
- ----------------------------------------------------------------------------------------------------------
Risks            The Fund invests only in obligations issued or guaranteed by the U.S. Government which are
                 subject to minimal risk of loss of income and principal. It may engage in the purchase of
                 such securities on a when-issued basis. The value of the Fund's portfolio securities, and
                 therefore the Fund's net asset value per share, may increase or decrease due to various
                 factors, principally changes in prevailing interest rates. Generally, a rise in interest
                 rates will result in a decrease in the Fund's net asset value per share, while a drop in
                 interest rates will result in an increase in the Fund's net asset value per share. In
                 addition, the average life of certain of the securities held in the Fund's portfolio
                 (i.e., GNMA Certificates) may be shortened by prepayments or refinancings of the mortgage
                 pools underlying such securities. Such prepayments may have an impact on dividends paid by
                 the Fund (see pages 7-12).
- ----------------------------------------------------------------------------------------------------------
</TABLE>
    
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION
 
                                       3
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
   
    The  following table illustrates all expenses and fees that a shareholder of
the Fund will incur. The expenses and fees  set forth in the table are based  on
the expenses and fees for the fiscal year ended December 31, 1996.
    
 
   
<TABLE>
<CAPTION>
                                                                                   CLASS A    CLASS B    CLASS C    CLASS D
                                                                                  ---------   -------   ---------   -------
<S>                                                                               <C>         <C>       <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES
- --------------------------------------------------------------------------------
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price)...   4.25%(1)    None      None        None
Sales Charge Imposed on Dividend Reinvestments..................................   None        None      None        None
Maximum Contingent Deferred Sales Charge (as a percentage of original purchase
  price or redemption proceeds).................................................   None(2)     5.00%(3)  1.00%(4)    None
Redemption Fees.................................................................   None        None      None        None
Exchange Fee....................................................................   None        None      None        None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- --------------------------------------------------------------------------------
Management Fees.................................................................   0.42%       0.42%     0.42%       0.42%
12b-1 Fees (5) (6)..............................................................   0.25%       0.75%     0.75%       None
Other Expenses..................................................................   0.08%       0.08%     0.08%       0.08%
Total Fund Operating Expenses (7)...............................................   0.75%       1.25%     1.25%       0.50%
</TABLE>
    
 
- ------------
   
(1) REDUCED   FOR  PURCHASES  OF  $25,000  AND   OVER  (SEE  "PURCHASE  OF  FUND
    SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES").
    
 
   
(2) INVESTMENTS THAT ARE NOT SUBJECT TO ANY SALES CHARGE AT THE TIME OF PURCHASE
    ARE SUBJECT TO  A CDSC OF  1.00% THAT  WILL BE IMPOSED  ON REDEMPTIONS  MADE
    WITHIN  ONE YEAR AFTER  PURCHASE, EXCEPT FOR  CERTAIN SPECIFIC CIRCUMSTANCES
    (SEE "PURCHASE  OF FUND  SHARES--INITIAL SALES  CHARGE ALTERNATIVE--CLASS  A
    SHARES").
    
 
   
(3) THE  CDSC IS SCALED DOWN  ANNUALLY TO 1.00% DURING  THE SIXTH YEAR, REACHING
    ZERO THEREAFTER.
    
 
   
(4) ONLY APPLICABLE  TO REDEMPTIONS  MADE WITHIN  ONE YEAR  AFTER PURCHASE  (SEE
    "PURCHASE OF FUND SHARES-- LEVEL LOAD ALTERNATIVE--CLASS C SHARES").
    
 
   
(5) THE  12b-1 FEE IS  ACCRUED DAILY AND  PAYABLE MONTHLY. THE  ENTIRE 12b-1 FEE
    PAYABLE BY CLASS A AND A PORTION OF THE 12b-1 FEE PAYABLE BY EACH OF CLASS B
    AND CLASS C EQUAL TO 0.25% OF THE AVERAGE DAILY NET ASSETS OF EACH OF  CLASS
    A  AND CLASS  C AND  0.20% OF  THE AVERAGE  DAILY NET  ASSETS OF  CLASS B IS
    CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL ASSOCIATION OF
    SECURITIES DEALERS,  INC. ("NASD")  GUIDELINES  AND IS  A PAYMENT  MADE  FOR
    PERSONAL  SERVICE AND/OR MAINTENANCE OF  SHAREHOLDER ACCOUNTS. THE REMAINDER
    OF THE  12b-1  FEE,  IF ANY,  IS  AN  ASSET-BASED SALES  CHARGE,  AND  IS  A
    DISTRIBUTION  FEE PAID TO THE DISTRIBUTOR  TO COMPENSATE IT FOR THE SERVICES
    PROVIDED AND  THE  EXPENSES BORNE  BY  THE  DISTRIBUTOR AND  OTHERS  IN  THE
    DISTRIBUTION  OF THE  FUND'S SHARES (SEE  "PURCHASE OF  FUND SHARES--PLAN OF
    DISTRIBUTION").
    
 
   
(6) UPON CONVERSION OF CLASS  B SHARES TO  CLASS A SHARES,  SUCH SHARES WILL  BE
    SUBJECT TO THE LOWER 12b-1 FEE APPLICABLE TO CLASS A SHARES. NO SALES CHARGE
    IS  IMPOSED AT THE TIME  OF CONVERSION OF CLASS B  SHARES TO CLASS A SHARES.
    CLASS C SHARES DO NOT HAVE A CONVERSION FEATURE AND, THEREFORE, ARE  SUBJECT
    TO   AN   ONGOING   0.75%   DISTRIBUTION   FEE   (SEE   "PURCHASE   OF  FUND
    SHARES--ALTERNATIVE PURCHASE ARRANGEMENTS").
    
 
   
(7) THERE WERE NO OUTSTANDING SHARES OF CLASS A, CLASS C OR CLASS D PRIOR TO THE
    DATE OF THIS  PROSPECTUS. ACCORDINGLY, "TOTAL  FUND OPERATING EXPENSES,"  AS
    SHOWN  ABOVE WITH RESPECT TO THOSE CLASSES,  ARE BASED UPON THE SUM OF 12b-1
    FEES, MANAGEMENT FEES AND ESTIMATED "OTHER EXPENSES."
    
 
                                       4
<PAGE>
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
EXAMPLES                                                                         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) a 5%
annual return and (2) redemption at the end of each time period:
    Class A...................................................................  $      50  $      65  $      82   $     132
    Class B...................................................................  $      63  $      70  $      89   $     151
    Class C...................................................................  $      23  $      40  $      69   $     151
    Class D...................................................................  $       5  $      16  $      28   $      63
 
You would pay the following expenses on the same $1,000 investment assuming no
redemption at the end of the period:
    Class A...................................................................  $      50  $      65  $      82   $     132
    Class B...................................................................  $      13  $      40  $      69   $     151
    Class C...................................................................  $      13  $      40  $      69   $     151
    Class D...................................................................  $       5  $      16  $      28   $      63
</TABLE>
    
 
   
    THE ABOVE EXAMPLES  SHOULD NOT  BE CONSIDERED  A REPRESENTATION  OF PAST  OR
FUTURE  EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS 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  Fund will bear directly or
indirectly. For a  more complete description  of these costs  and expenses,  see
"The Fund and its Management," "Purchase of Fund Shares -- Plan of Distribution"
and "Redemptions and Repurchases."
    
 
   
    Long-term  shareholders of Class B and Class C may pay more in sales charges
and/or distribution fees than the  economic equivalent of the maximum  front-end
sales charges permitted by the NASD.
    
 
                                       5
<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 the  Statement  of Additional
Information. Further information about the performance of the Fund is  contained
in  the  Fund's Annual  Report to  Shareholders, which  may be  obtained without
charge upon request to the Fund. All shares  of the Fund held prior to July  28,
1997,  other than the shares held  by certain employee benefit plans established
by Dean Witter Reynolds Inc. and its affiliate, SPS Transaction Services,  Inc.,
have been designated Class B shares. Shares held by those employee benefit plans
prior to July 28, 1997 have been designated Class D shares.
    
 
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED DECEMBER 31,
                           -------------------------------------------------------------------------------------------------
                            1996      1995      1994      1993      1992      1991      1990      1989      1988      1987
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                        <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value,
   beginning of period...   $ 9.21    $ 8.41    $ 9.31    $ 9.30    $ 9.52    $ 9.37    $ 9.51    $ 9.42    $ 9.75    $10.33
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net investment
   income................     0.56      0.57      0.58      0.64      0.74      0.87      0.90      0.91      0.97      0.96
  Net realized and
   unrealized gain
   (loss)................    (0.29)     0.80     (0.90)     0.01     (0.22)     0.15     (0.14)     0.09     (0.33)    (0.58)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Total from investment
   operations............     0.27      1.37     (0.32)     0.65      0.52      1.02      0.76      1.00      0.64      0.38
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Less dividends from net
   investment income.....    (0.56)    (0.57)    (0.58)    (0.64)    (0.74)    (0.87)    (0.90)    (0.91)    (0.97)    (0.96)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net asset value, end of
   period................   $ 8.92    $ 9.21    $ 8.41    $ 9.31    $ 9.30    $ 9.52    $ 9.37    $ 9.51    $ 9.42    $ 9.75
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT
 RETURN+.................    3.16%    16.74%   (3.51)%     7.13%     5.76%    11.43%     8.49%    11.10%     6.74%     3.92%
  Ratios to average net
   assets:
    Expenses.............    1.25%     1.24%     1.22%     1.18%     1.20%     1.17%     1.23%     1.19%     1.21%     1.18%
    Net investment
     income..............    6.28%     6.44%     6.57%     6.78%     7.91%     9.23%     9.60%     9.62%    10.01%     9.63%
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in millions...   $6,450    $7,955    $8,211   $12,235   $12,484   $11,736    $9,829   $10,167   $10,366   $10,418
  Portfolio turnover
   rate..................       8%       14%       26%       32%       40%      104%       54%       44%       15%       51%
</TABLE>
 
- -------------
+ DOES  NOT REFLECT THE DEDUCTION  OF SALES CHARGE. CALCULATED  BASED ON THE NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 
                                       6
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Dean Witter U.S.  Government Securities  Trust (the "Fund")  is an  open-end
diversified  management  investment  company  registered  under  the  Investment
Company Act of 1940,  as amended (the "Act").  The Fund 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 September 29, 1983.
 
   
    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment  Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment  Manager.  The Investment  Manager, which  was incorporated  in July,
1992, is a wholly-owned  subsidiary of Morgan Stanley,  Dean Witter, Discover  &
Co.,  a preeminent global financial services  firm that maintains leading market
positions in each of its three primary businesses--securities, asset  management
and credit services.
    
 
   
    InterCapital  and its wholly-owned subsidiary,  Dean Witter Services Company
Inc.,  serve  in  various   investment  management,  advisory,  management   and
administrative  capacities  to 102  investment  companies, thirty  of  which are
listed  on  the  New  York  Stock  Exchange,  with  combined  total  assets   of
approximately  $   billion at June 30, 1997. The Investment Manager also manages
portfolios of pension plans, other institutions and individuals which aggregated
approximately $   billion at such date.
    
 
    The Fund  has  retained the  Investment  Manager to  provide  administrative
services,  manage its business  affairs and manage the  investment of the Fund'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 Fund.
 
    The Fund's Trustees  review the various  services provided by  or under  the
direction of the Investment Manager to ensure that the Fund's general investment
policies  and programs  are being properly  carried out  and that administrative
services are being provided to the Fund in a satisfactory manner.
 
    As full compensation for the services  and facilities furnished to the  Fund
and  expenses of the Fund  assumed by the Investment  Manager, the Fund pays the
Investment Manager monthly compensation  calculated daily at  an annual rate  of
0.50%  of the  daily net assets  of the  Fund up to  $1 billion,  scaled down at
various asset levels to 0.30% on assets over $12.5 billion. For the fiscal  year
ended  December 31, 1996, the Fund  accrued total compensation to the Investment
Manager amounting to 0.42% of the Fund's average daily net assets and the Fund's
total expenses amounted to 1.25% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
    The investment objective of the Fund is high current income consistent  with
safety  of  principal.  This investment  objective  may not  be  changed without
approval of the Fund's shareholders. The Fund seeks to achieve its objective  by
investing  in obligations  issued or  guaranteed by  the U.S.  Government or its
instrumentalities ("U.S.  Government  securities").  All  such  obligations  are
backed  by the "full faith and credit"  of the United States. Investments may be
made in obligations of instrumentalities of the U.S. Government only where  such
obligations are guaranteed by the U.S. Government.
    U.S.  Government securities  include U.S. Treasury  securities consisting of
Treasury bills,  Treasury notes  and  Treasury bonds.  Some  of the  other  U.S.
Government  securities in  which the Fund  may invest include  securities of the
Federal Housing Administration,  the Government  National Mortgage  Association,
the  Department of  Housing and Urban  Development, the  Export-Import Bank, the
Farmers
 
                                       7
<PAGE>
Home  Administration,  the   General  Services   Administration,  the   Maritime
Administration,   Resolution   Funding  Corporation   and  the   Small  Business
Administration. The  maturities  of such  securities  usually range  from  three
months to thirty years.
 
    The  Fund  is  not limited  as  to  the maturities  of  the  U.S. Government
securities in which it may invest, except  that the Fund will not purchase  zero
coupon  securities with  remaining maturities  of longer  than ten  years. For a
discussion of the risks  of investing in  U.S. Government securities  (including
such  securities purchased on a when-issued, delayed delivery or firm commitment
basis and zero coupon securities), see "Risk Considerations" below.
 
    While the Fund has  the ability to  invest in any  securities backed by  the
full  faith and credit of the United  States, it is currently anticipated that a
substantial portion of the Fund's assets will be invested in Certificates of the
Government National  Mortgage  Association  (GNMA). Should  market  or  economic
conditions  warrant,  this  policy is  subject  to  change at  any  time  at the
discretion of the Investment Manager.
 
    DESCRIPTION OF  GNMA CERTIFICATES    GNMA Certificates  are  mortgage-backed
securities.  Each  Certificate  evidences  an interest  in  a  specific  pool of
mortgages insured  by the  Federal Housing  Administration or  the Farmers  Home
Administration   (FHA)  or  guaranteed  by  the  Veterans  Administration  (VA).
Scheduled payments of principal and interest are made to the registered  holders
of  GNMA Certificates. The GNMA Certificates that the Fund will invest in are of
the modified pass-through type.  GNMA guarantees the  timely payment of  monthly
installments  of principal and interest on modified pass-through certificates at
the time such payments are due, whether or not such amounts are collected by the
issuer on the underlying mortgages. The  National Housing Act provides that  the
full  faith and credit of the United States  is pledged to the timely payment of
principal and interest by GNMA of amounts due on these GNMA Certificates.
 
    The average life  of GNMA  Certificates varies  with the  maturities of  the
underlying mortgage instruments with maximum maturities of 30 years. The average
life  is  likely to  be substantially  less  than the  original maturity  of the
mortgage pools  underlying  the  securities  as the  result  of  prepayments  or
refinancing  of  such  mortgages  or foreclosure.  Such  prepayments  are passed
through to the registered holder with the regular monthly payments of  principal
and  interest, which has the effect of reducing future payments. Due to the GNMA
guarantee, foreclosures impose no risk  to investment principal. The  occurrence
of  mortgage prepayments is affected by  factors including the level of interest
rates, general economic  conditions, the location  and age of  the mortgage  and
other  social and demographic conditions. As prepayment rates vary widely, it is
not possible  to accurately  predict  the average  life  of a  particular  pool.
However,  statistics indicate  that the  average life  of the  type of mortgages
backing the majority  of GNMA  Certificates is approximately  twelve years.  For
this  reason,  it is  standard practice  to treat  GNMA Certificates  as 30-year
mortgage-backed securities  which prepay  fully in  the twelfth  year. Pools  of
mortgages  with other maturities or  different characteristics will have varying
assumptions for average  life. The assumed  average life of  pools of  mortgages
having  terms of less than 30 years is less than twelve years, but typically not
less than five years.
 
    The coupon rate of interest of GNMA Certificates is lower than the  interest
rate   paid  on  the  VA-guaranteed  or  FHA-insured  mortgages  underlying  the
Certificates, but only by the amount of the fees paid to GNMA and the issuer.
 
    Yields on pass-through securities are typically quoted by investment dealers
and vendors  based  on  the  maturity of  the  underlying  instruments  and  the
associated  average life  assumption. In periods  of falling  interest rates the
rate of prepayment tends to increase, thereby shortening the actual average life
of a pool of mortgage-related securities. Conversely, in periods of rising rates
the  rate   of   prepayment  tends   to   decrease,  thereby   lengthening   the
 
                                       8
<PAGE>
actual  average life of  the pool. Reinvestment  by the Fund  of prepayments may
occur  at  higher  or  lower  interest  rates  than  the  original   investment.
Historically,  actual  average life  has  been consistent  with  the twelve-year
assumption referred  to above.  The actual  yield of  each GNMA  Certificate  is
influenced  by the  prepayment experience  of the  mortgage pool  underlying the
Certificates.  Interest  on  GNMA  Certificates  is  paid  monthly  rather  than
semi-annually as for traditional bonds.
 
    The  Fund  will  invest  in  mortgage  pass-through  securities representing
participation interests in  pools of  residential mortgage  loans originated  by
United  States governmental or private lenders such as banks, broker-dealers and
financing  corporations  and  guaranteed,  to   the  extent  provided  in   such
securities,  by  the  United  States  Government  or  one  of  its  agencies  or
instrumentalities.  Such  securities,  which  are  ownership  interests  in  the
underlying  mortgage  loans,  differ from  conventional  debt  securities, which
provide  for   periodic  payment   of  interest   in  fixed   amounts   (usually
semi-annually)  and principal payments  at maturity or  on specified call dates.
Mortgage pass-through  securities  provide  for  monthly  payments  that  are  a
"pass-through"  of the  monthly interest  and principal  payments (including any
prepayments) made by the individual borrowers on the pooled mortgage loans,  net
of  any fees paid  to the guarantor of  such securities and  the servicer of the
underlying mortgage loans.  The guaranteed mortgage  pass-through securities  in
which  the Fund may invest  include those issued or  guaranteed by GNMA or other
entities which securities are backed by the full faith and credit of the  United
States.
 
    Certificates  for  mortgage-backed  securities  evidence  an  interest  in a
specific pool of  mortgages. These  certificates are, in  most cases,  "modified
pass-through"  instruments, wherein the issuing agency guarantees the payment of
principal and interest on mortgages underlying the certificates, whether or  not
such amounts are collected by the issuer on the underlying mortgages.
 
    ADJUSTABLE RATE MORTGAGE SECURITIES.  The Fund may also invest in adjustable
rate  mortgage securities  ("ARMs"), which are  pass-through mortgage securities
collateralized by  mortgages  with  adjustable rather  than  fixed  rates.  ARMs
eligible  for inclusion in a mortgage pool generally provide for a fixed initial
mortgage interest  rate for  either the  first three,  six, twelve  or  thirteen
scheduled  monthly  payments.  Thereafter,  the interest  rates  are  subject to
periodic adjustment based on changes to a designated benchmark index.
 
    ARMs contain maximum and  minimum rates beyond  which the mortgage  interest
rate  may not vary over the lifetime  of the security. In addition, certain ARMs
provide for additional limitations on the  maximum amount by which the  mortgage
interest  rate  may  adjust  for any  single  adjustment  period. Alternatively,
certain ARMs contain limitations on changes in the required monthly payment.  In
the  event that a monthly payment is not sufficient to pay the interest accruing
on an ARM, any  such excess interest  is added to the  principal balance of  the
mortgage  loan, which is repaid through  future monthly payments. If the monthly
payment for such an instrument  exceeds the sum of  the interest accrued at  the
applicable  mortgage interest  rate and the  principal payment  required at such
point to amortize the outstanding principal  balance over the remaining term  of
the  loan,  the excess  is  utilized to  reduce  the then  outstanding principal
balance of the ARM.
 
    COLLATERALIZED   MORTGAGE    OBLIGATIONS   AND    MULTICLASS    PASS-THROUGH
SECURITIES.   Collateralized mortgage obligations or "CMOs" are debt obligations
collateralized by mortgage loans or mortgage pass-through securities. Typically,
CMOs are collateralized  by GNMA, FNMA  or FHLMC Certificates,  but also may  be
collateralized  by whole loans or private mortgage pass-through securities (such
collateral  collectively  hereinafter   referred  to   as  "Mortgage   Assets").
Multiclass  pass-through securities are equity interests  in a trust composed of
Mortgage Assets. Payments of principal of  and interest on the Mortgage  Assets,
and any reinvestment income
 
                                       9
<PAGE>
thereon,  provide the funds  to pay debt  service on the  CMOs or make scheduled
distributions on the multiclass pass-through  securities. CMOs may be issued  by
agencies  or instrumentalities  of the United  States government,  or by private
originators of,  or investors  in, mortgage  loans, including  savings and  loan
associations,  mortgage banks,  commercial banks,  investment banks  and special
purpose subsidiaries of  the foregoing. However,  the Fund will  only invest  in
CMOs which are backed by the full faith and credit of the United States.
 
    The  issuer of a  series of CMOs  may elect to  be treated as  a Real Estate
Mortgage Investment  Conduit  ("REMIC").  REMICs include  governmental  and/  or
private  entities that issue a fixed pool of mortgages secured by an interest in
real property. REMICs are similar to CMOs in that they issue multiple classes of
securities, but  unlike  CMOs, which  are  required  to be  structured  as  debt
securities,  REMICs may  be structured  as indirect  ownership interests  in the
underlying assets of the REMICs themselves. However, there are no effects on the
Fund from investing in CMOs issued by  entities that have elected to be  treated
as  REMICs, and all  future references to  CMOs shall also  be deemed to include
REMICs. The Fund may invest without limitation in CMOs.
 
    In a CMO, a series of bonds  or certificates is issued in multiple  classes.
Each  class of CMOs, often  referred to as a "tranche,"  is issued at a specific
fixed or floating coupon  rate and has a  stated maturity or final  distribution
date.  Principal prepayments  on the  Mortgage Assets may  cause the  CMOs to be
retired substantially earlier than their stated maturities or final distribution
dates. Interest is  paid or accrues  on all classes  of the CMOs  on a  monthly,
quarterly  or  semi-annual basis.  Certain CMOs  may  have variable  or floating
interest rates and  others may be  stripped (securities which  provide only  the
principal or interest feature of the underlying security).
 
    The  principal of and interest on the Mortgage Assets may be allocated among
the several classes of a  CMO series in a  number of different ways.  Generally,
the  purpose of the allocation of the cash  flow of a CMO to the various classes
is to obtain a more predictable cash flow to the individual tranches than exists
with the  underlying  collateral  of  the  CMO. As  a  general  rule,  the  more
predictable  the cash flow is on a  CMO tranche, the lower the anticipated yield
will be on that tranche  at the time of  issuance relative to prevailing  market
yields  on mortgage-backed securities.  As part of the  process of creating more
predictable cash flows on most of the tranches in a series of CMOs, one or  more
tranches  generally must be  created that absorb  most of the  volatility in the
cash flows on the  underlying mortgage loans. The  yields on these tranches  are
generally  higher than  prevailing market  yields on  mortgage-backed securities
with similar maturities. As  a result of  the uncertainty of  the cash flows  of
these  tranches, the market prices of and  yield on these tranches generally are
more volatile.
 
    The Fund  also may  invest in,  among other  things, parallel  pay CMOs  and
Planned  Amortization Class CMOs ("PAC Bonds"). Parallel pay CMOs are structured
to provide payments of principal  on each payment date  to more than one  class.
These  simultaneous payments  are taken into  account in  calculating the stated
maturity date or final distribution date of each class, which, as with other CMO
structures, must be retired  by its stated maturity  date or final  distribution
date  but may  be retired  earlier. PAC  Bonds generally  require payments  of a
specified amount  of  principal on  each  payment  date. PAC  Bonds  always  are
parallel  pay CMOs with the required principal payment on such securities having
the highest priority after interest has been paid to all classes.
 
    For a discussion of  the risks of  investing in mortgage-backed  securities,
see "Risk Considerations" below.
 
    The  purchase or retention of  stripped mortgage-backed securities, CMOs and
REMICs investments  will be  made  only in  conformity  with the  provisions  of
Section 703.5 of the National Credit Union
 
                                       10
<PAGE>
Administration  Rules and  Regulations, as  such provisions  became effective on
December 2, 1991.
 
RISK CONSIDERATIONS
 
    The net asset value of the Fund's shares will fluctuate with changes in  the
market value of its portfolio securities. Neither the value nor the yield of the
U.S. Government securities invested in by the Fund (or the value or yield of the
shares  of the Fund) is guaranteed by the U.S. Government. Such values and yield
will fluctuate with changes in prevailing interest rates and other factors.
 
    Generally, as  prevailing  interest  rates  rise,  the  value  of  the  U.S.
Government  securities held by the Fund, and, concomitantly, the net asset value
of the  Fund's  shares,  will  fall.  Such  securities  with  longer  maturities
generally  tend  to produce  higher  yields and  are  subject to  greater market
fluctuation as a result of changes  in interest rates than debt securities  with
shorter   maturities.  As  noted  above,  except  with  regard  to  zero  coupon
securities, the Fund is not limited as to the maturities of the U.S.  Government
securities in which it may invest.
 
    RISKS  OF  MORTGAGE-BACKED  SECURITIES.    Mortgage-backed  securities  have
certain different characteristics  than traditional debt  securities. Among  the
major  differences  are  that  interest and  principal  payments  are  made more
frequently, usually  monthly, and  that principal  may be  prepaid at  any  time
because  the underlying mortgage loans or  other assets generally may be prepaid
at any time. As a result, if the Fund purchases such a security at a premium,  a
prepayment rate that is faster than expected may reduce yield to maturity, while
a  pre-payment rate that is slower than expected may have the opposite effect of
increasing yield  to  maturity.  Alternatively,  if  the  Fund  purchases  these
securities  at a discount, faster than expected prepayments will increase, while
slower than expected prepayments may reduce, yield to maturity.
 
    Mortgage-backed securities,  like  all  fixed-income  securities,  generally
decrease  in value  as a  result of  increases in  interest rates.  In addition,
although generally the value of fixed-income securities increases during periods
of falling  interest rates,  mortgage-backed securities  may benefit  less  than
other  fixed-income securities from declining interest rates because of the risk
of prepayments. As discussed above under "Description of GNMA Certificates," the
assumed average life of mortgages backing  the majority of GNMA Certificates  is
twelve  years. This average life is likely  to be substantially shorter than the
original maturity of the mortgage pools underlying the certificates, as a pool's
duration may be shortened by unscheduled  or early payments of principal on  the
underlying  mortgages. As  prepayment rates vary  widely, it is  not possible to
accurately predict the average life of a particular pool.
 
    Although the extent of  prepayments on a pool  of mortgage loans depends  on
various  factors,  including the  prevailing  level of  interest  rates, general
economic conditions, the location and age  of the mortgage and other social  and
demographic  conditions, as  a general rule  prepayments on  fixed rate mortgage
loans will  increase during  a period  of falling  interest rates  and  decrease
during  a period of rising interest rates.  If the Fund has purchased securities
backed by pools containing mortgages whose yields exceed the prevailing interest
rate, any premium paid  for such securities  may be lost. As  a result, the  net
asset  value  of  shares of  the  Fund and  the  Fund's ability  to  achieve its
investment objective may be adversely affected by mortgage prepayments.  Amounts
available  for reinvestment by the Fund are likely to be greater during a period
of declining interest rates and, as a  result, likely to be reinvested at  lower
interest rates than during a period of rising interest rates.
 
    There  are  certain risks  associated specifically  with  CMOs. A  number of
different factors,  including  the extent  of  prepayment of  principal  of  the
Mortgage  Assets, affect the availability of  cash for principal payments by the
CMO issuer on any payment date and, accordingly, affect the timing of  principal
payments on each CMO class.
 
    WHEN-ISSUED  AND DELAYED DELIVERY  SECURITIES AND FORWARD  COMMITMENTS  From
time to time, in
 
                                       11
<PAGE>
the ordinary  course  of  business,  the  Fund  may  purchase  securities  on  a
when-issued  or delayed delivery basis  or may purchase or  sell securities on a
forward commitment basis. When  such transactions are  negotiated, the price  is
fixed  at the time  of the commitment,  but delivery and  payment can take place
between one month and 120 days after the date of the commitment. While the  Fund
will  only purchase  securities on  a when-issued,  delayed delivery  or forward
commitment basis with the  intention of acquiring the  securities, the Fund  may
sell  the securities before the settlement date,  if it is deemed advisable. The
securities so  purchased  or sold  are  subject  to market  fluctuation  and  no
interest accrues to the purchaser during this period. At the time the Fund makes
the commitment to purchase or sell securities on a when-issued, delayed delivery
or  forward  commitment basis,  it will  record  the transaction  and thereafter
reflect the value,  each day,  of such  security purchased  or, if  a sale,  the
proceeds  to be  received, in determining  its net  asset value. At  the time of
delivery of the securities, their value may be more or less than the purchase or
sale price. The Fund will also establish a segregated account with its custodian
bank in which  it will continually  maintain cash or  cash equivalents or  other
portfolio  securities equal in value to  commitments to purchase securities on a
when-issued, delayed delivery or forward  commitment basis. There is no  overall
limit  on the  percentage of  the Fund's  assets which  may be  committed to the
purchase of securities on a when-issued, delayed delivery or forward  commitment
basis.  An increase  in the  percentage of  the Fund's  assets committed  to the
purchase of securities on a when-issued, delayed delivery or forward  commitment
basis may increase the volatility of the Fund's net asset value.
 
    ZERO  COUPON  SECURITIES.    A portion  of  the  U.S.  Government securities
purchased by the Fund may be zero coupon securities with maturity dates in  each
case  no later than ten years from the  settlement date for the purchase of such
security. Such securities are  purchased at a discount  from their face  amount,
giving  the purchaser  the right  to receive their  full value  at maturity. The
interest earned on such securities is, implicitly, automatically compounded  and
paid  out at maturity. While such compounding  at a constant rate eliminates the
risk of  receiving lower  yields  upon reinvestment  of interest  if  prevailing
interest  rates decline, the owner  of a zero coupon  security will be unable to
participate  in  higher  yields  upon  reinvestment  of  interest  received   on
interest-paying securities if prevailing interest rates rise.
 
    A  zero coupon  security pays  no interest  to its  holder during  its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash  available for distribution  to shareholders. In  addition,
zero  coupon securities are subject  to substantially greater price fluctuations
during periods  of  changing  prevailing  interest  rates  than  are  comparable
securities  which  pay interest  on  a current  basis.  Current federal  tax law
requires that a holder  (such as the  Fund) of a zero  coupon security accrue  a
portion  of the discount at which the security was purchased as income each year
even though  the Fund  receives no  interest payments  in cash  on the  security
during the year.
 
    For  additional risk disclosure, please refer  to the discussion of specific
investments above in "Investment Objective and Policies."
                              -------------------
 
   
    Notwithstanding any other  investment policy  or restriction,  the Fund  may
seek  to achieve its investment objective  by investing all or substantially all
of its  assets  in another  investment  company having  substantially  the  same
investment objectives and policies as the Fund.
    
 
PORTFOLIO TRADING
 
   
    The  Fund is managed within InterCapital's Taxable Fixed-Income Group, which
manages twenty-five funds and fund portfolios, with approximately $  billion  in
assets  at June 30, 1997. Rajesh K. Gupta, Senior Vice President of InterCapital
and a member of InterCapital's Taxable Fixed-Income Group, has been the  primary
portfolio   manager  of  the  Fund  since  July,  1992  and  has  been  managing
    
 
                                       12
<PAGE>
portfolios comprised  of government  securities at  InterCapital for  over  five
years.
 
    Although  the  Fund  does not  intend  to  engage in  short-term  trading of
portfolio securities as a  means of achieving its  investment objective, it  may
sell  portfolio securities without regard  to the length of  time they have been
held whenever such sale will in the Investment Manager's opinion strengthen  the
Fund's  position  and  contribute  to its  investment  objective.  The portfolio
trading engaged  in  by the  Fund  may result  in  its portfolio  turnover  rate
exceeding  100%. Brokerage commissions are not  normally charged on the purchase
or sale of U.S. Government obligations, but such transactions may involve  costs
in the form of spreads between bid and asked prices. Pursuant to an order of the
Securities  and Exchange Commission, the  Fund may effect principal transactions
in certain money market  instruments with Dean Witter  Reynolds Inc. ("DWR"),  a
broker-dealer  affiliate  of  InterCapital.  In  addition,  the  Fund  may incur
brokerage commissions on transactions conducted through DWR.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
   
    The Fund  offers each  Class of  its  shares for  sale to  the public  on  a
continuous basis. Pursuant to a Distribution Agreement between the Fund and Dean
Witter  Distributors Inc.  (the "Distributor"),  an affiliate  of the Investment
Manager, shares of the  Fund are distributed by  the Distributor and offered  by
DWR  and other dealers  which 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 Fund offers four classes of shares (each, a "Class"). Class A shares are
sold  to investors with an initial sales charge that declines to zero for larger
purchases; however, Class  A shares  sold without  an initial  sales charge  are
subject  to  a contingent  deferred sales  charge ("CDSC")  of 1.0%  if redeemed
within one year of purchase, except for certain specific circumstances. Class  B
shares  are  sold without  an initial  sales charge  but are  subject to  a CDSC
(scaled down from 5.0% to 1.0%)  payable upon most redemptions within six  years
after    purchase.   (Class   B   shares    purchased   by   certain   qualified
employer-sponsored benefit plans are subject to a CDSC scaled down from 2.0%  to
1.0%  if redeemed within  three years after  purchase.) Class C  shares are sold
without an  initial sales  charge but  are subject  to a  CDSC of  1.0% on  most
redemptions made within one year after purchase. Class D shares are sold without
an  initial sales charge or CDSC and  are available only to investors meeting an
initial  investment  minimum  of  $5  million,  and  to  certain  other  limited
categories of investors. At the discretion of the Board of Trustees of the Fund,
Class  A shares may be sold to categories  of investors in addition to those set
forth in this prospectus  at net asset value  without a front-end sales  charge,
and Class D shares may be sold to certain other categories of investors, in each
case  as  may be  described  in the  then current  prospectus  of the  Fund. See
"Alternative  Purchase  Arrangements--  Selecting  a  Particular  Class"  for  a
discussion  of  factors  to  consider  in selecting  which  Class  of  shares to
purchase.
    
 
   
    The minimum initial purchase  is $1,000 for each  Class of shares,  although
Class D shares are only available to persons investing $5 million or more and to
certain  other limited categories  of investors. For the  purpose of meeting the
minimum $5 million  initial investment for  Class D shares,  and subject to  the
$1,000  minimum initial  investment for  each Class  of the  Fund, an investor's
existing holdings of Class A shares and concurrent investments in Class D shares
of the Fund  and other  multiple class funds  for which  InterCapital serves  as
investment  manager  ("Dean  Witter  Multi-Class  Funds")  will  be  aggregated.
Subsequent purchases of $100 or more may be made by sending a check, payable  to
Dean  Witter U.S.  Government Securities  Trust, directly  to Dean  Witter Trust
Company (the "Transfer Agent")  at P.O. Box  1040, Jersey City,  NJ 07303 or  by
contacting  an account  executive of DWR  or other  Selected Broker-Dealer. When
purchasing shares of the  Fund, investors must specify  whether the purchase  is
for  Class A, Class B, Class C or Class  D shares. If no Class is specified, the
Transfer Agent  will not  process  the transaction  until  the proper  Class  is
identified.  The minimum  initial purchase, in  the case  of investments through
EasyInvest, an automatic purchase plan (see "Share-
    
 
                                       13
<PAGE>
   
holder Services"), is $100, provided that the schedule of automatic  investments
will  result in  investments totalling at  least $1,000 within  the first twelve
months. In  the case  of investments  pursuant to  Systematic Payroll  Deduction
Plans  (including Individual Retirement Plans), the Fund, in its discretion, may
accept investments without regard to  any minimum amounts which would  otherwise
be  required, if the Fund has reason to believe that additional investments will
increase the investment  in all accounts  under such Plans  to at least  $1,000.
Certificates  for shares  purchased will not  be issued unless  requested by the
shareholder in writing to the Transfer Agent.
    
 
   
    Shares of  the Fund  are sold  through  the Distributor  on a  normal  three
business  day settlement basis; that  is, payment generally is  due on or before
the third business  day (settlement  date) after the  order is  placed with  the
Distributor.  Shares of the Fund purchased  through the Distributor are entitled
to dividends beginning on the next business day following settlement date. Since
DWR and other  Selected Broker-Dealers  forward investors'  funds on  settlement
date,  they will benefit  from the temporary  use of the  funds where payment is
made prior thereto. Shares purchased through the Transfer Agent are entitled  to
dividends  beginning on the next business day  following receipt of an order. As
noted above, orders placed directly with the Transfer Agent must be  accompanied
by payment. Investors will be entitled to receive capital gains distributions if
their  order is received by the close of business on the day prior to the record
date for such distributions (see "Redemptions and Repurchases"). Sales personnel
of a Selected Broker-Dealer  are compensated for selling  shares of the Fund  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.  The Fund and  the
Distributor reserve the right to reject any purchase orders.
    
 
   
ALTERNATIVE PURCHASE ARRANGEMENTS
    
   
    The  Fund offers several Classes of  shares to investors designed to provide
them with the flexibility of selecting an investment best suited to their needs.
The general public is offered three Classes  of shares: Class A shares, Class  B
shares  and Class C shares,  which differ principally in  terms of sales charges
and rate of expenses to which they are subject. A fourth Class of shares,  Class
D  shares, is  offered only  to limited  categories of  investors (see  "No Load
Alternative--Class D Shares" below).
    
 
   
    Each Class A, Class B,  Class C or Class D  share of the Fund represents  an
identical  interest in the investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder  service
fees,  Class B and Class C shares  bear the expenses of the ongoing distribution
fees and Class A,  Class B and Class  C shares which are  redeemed subject to  a
CDSC bear the expense of the additional incremental distribution costs resulting
from  the CDSC applicable  to shares of those  Classes. The ongoing distribution
fees that are imposed  on Class A, Class  B and Class C  shares will be  imposed
directly  against those  Classes and  not against  all assets  of the  Fund and,
accordingly, such charges against one Class will not affect the net asset  value
of any other Class or have any impact on investors choosing another sales charge
option. See "Plan of Distribution" and "Redemptions and Repurchases."
    
 
   
    Set  forth below is a summary of the differences between the Classes and the
factors an  investor should  consider when  selecting a  particular Class.  This
summary  is qualified in its entirety by  detailed discussion of each Class that
follows this summary.
    
 
   
    CLASS A SHARES.  Class A shares are sold at net asset value plus an  initial
sales  charge of up  to 4.25%. The  initial sales charge  is reduced for certain
purchases. Investments of $1 million or  more (and investments by certain  other
limited  categories of investors)  are not subject  to any sales  charges at the
time of purchase but are  subject to a CDSC of  1.0% on redemptions made  within
one  year after  purchase, except  for certain  specific circumstances.  Class A
shares are also subject to a 12b-1 fee  of up to 0.25% of the average daily  net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."
    
   
    CLASS  B SHARES.   Class  B shares are  offered at  net asset  value with no
initial sales charge but are subject to  a CDSC (scaled down from 5.0% to  1.0%)
if  redeemed within six years of purchase.  (Class B shares purchased by certain
qualified employer-sponsored benefit  plans are  subject to a  CDSC scaled  down
from 2.0% to 1.0% if redeemed within
    
 
                                       14
<PAGE>
   
three  years after purchase.)  This CDSC may be  waived for certain redemptions.
Class B  shares are  also subject  to an  annual 12b-1  fee of  0.75% (0.65%  on
amounts  over $10  billion) of  the lesser of:  (a) the  average daily aggregate
gross sales of the Fund's  Class B shares since the  inception of the Fund  (not
including  reinvestments of dividends or  capital gains distributions), less the
average daily aggregate net  asset value of the  Fund's Class B shares  redeemed
since  the Fund's inception upon which a CDSC has been imposed or waived, or (b)
the average daily net assets  of Class B. The  Class B shares' distribution  fee
will cause that Class to have higher expenses and pay lower dividends than Class
A or Class D shares.
    
   
    After   approximately  ten   (10)  years,   Class  B   shares  will  convert
automatically to Class A  shares of the  Fund, based on  the relative net  asset
values  of the shares of the two Classes  on the conversion date. In addition, a
certain  portion  of  Class  B  shares  that  have  been  acquired  through  the
reinvestment  of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative--Class B Shares."
    
   
    CLASS C SHARES.  Class C shares are sold at net asset value with no  initial
sales  charge but are subject  to a CDSC of 1.0%  on redemptions made within one
year after purchase. This CDSC may  be waived for certain redemptions. They  are
subject to an annual 12b-1 fee of up to 0.75% of the average daily net assets of
the Class C shares. The Class C shares' distribution fee may cause that Class to
have higher expenses and pay lower dividends than Class A or Class D shares. See
"Level Load Alternative--Class C Shares."
    
   
    CLASS  D SHARES.  Class D shares are available only to limited categories of
investors (see "No Load Alternative--Class D Shares" below). Class D shares  are
sold  at net  asset value  with no initial  sales charge  or CDSC.  They are not
subject to any 12b-1 fees. See "No Load Alternative--Class D Shares."
    
   
    SELECTING A PARTICULAR  CLASS.  In  deciding which Class  of Fund shares  to
purchase,  investors should consider the following factors, as well as any other
relevant facts and circumstances:
    
   
    The decision as to which Class of  shares is more beneficial to an  investor
depends  on the amount and  intended length of his  or her investment. Investors
who prefer an  initial sales charge  alternative may elect  to purchase Class  A
shares.  Investors  qualifying  for significantly  reduced  or, in  the  case of
purchases of $1  million or  more, no  initial sales  charges may  find Class  A
shares  particularly attractive because similar  sales charge reductions are not
available with respect to Class  B or Class C  shares. Moreover, Class A  shares
are  subject to lower ongoing  expenses than are Class B  or Class C shares over
the term of the investment.  As an alternative, Class B  and Class C shares  are
sold  without  any  initial  sales  charge  so  the  entire  purchase  price  is
immediately invested  in the  Fund. Any  investment return  on these  additional
investment  amounts may partially or wholly offset the higher annual expenses of
these Classes. Because the  Fund's future return  cannot be predicted,  however,
there can be no assurance that this would be the case.
    
   
    Finally,  investors should  consider the effect  of the CDSC  period and any
conversion rights of  the Classes in  the context of  their own investment  time
frame. For example, although Class C shares are subject to a significantly lower
CDSC  upon redemptions, they do not, unlike Class B shares, convert into Class A
shares after approximately ten years, and, therefore, are subject to an  ongoing
12b-1  fee of 0.75% (rather than the 0.25% fee applicable to Class A shares) for
an indefinite period of time. Thus, Class  B shares may be more attractive  than
Class  C  shares  to  investors  with  longer  term  investment  outlooks. Other
investors, however, may elect to purchase  Class C shares if, for example,  they
determine  that they do not  wish to be subject to  a front-end sales charge and
they are uncertain as to the length of time they intend to hold their shares.
    
   
    For the purpose  of meeting  the $5  million minimum  investment amount  for
Class D shares, holdings of Class A shares in all Dean Witter Multi-Class Funds,
and  holdings  of  shares  of "Exchange  Funds"  (see  "Shareholder  Services --
Exchange Privilege")  for which  Class A  shares have  been exchanged,  will  be
included together with the current investment amount.
    
   
    Sales personnel may receive different compensation for selling each Class of
shares.  Investors should understand that  the purpose of a  CDSC is the same as
that of the initial sales  charge in that the  sales charges applicable to  each
Class provide for the financing of the distribution of shares of that Class.
    
 
                                       15
<PAGE>
   
    Set  forth  below is  a chart  comparing  the sales  charge, 12b-1  fees and
conversion options applicable to each Class of shares:
    
 
   
<TABLE>
<CAPTION>
                                         CONVERSION
  CLASS     SALES CHARGE    12b-1 FEE      FEATURE
<C>        <S>              <C>         <C>
    A      Maximum 4.25%      0.25%          No
           initial sales
           charge reduced
           for purchases
           of $25,000 and
           over; shares
           sold without an
           initial sales
           charge
           generally
           subject to a
           1.0% CDSC
           during first
           year.
    B      Maximum 5.0%     0.75%       B shares
           CDSC during the  (0.65% on   convert to A
           first year       amounts     shares
           decreasing to 0  over $10    automatically
           after six years  billion)    after
                                        approximately
                                        ten years
    C      1.0% CDSC          0.75%          No
           during first
           year
    D           None           None          No
</TABLE>
    
 
   
    See "Purchase  of Fund  Shares" and  "The  Fund and  its Management"  for  a
complete  description of the sales charges and service and distribution fees for
each Class  of  shares  and  "Determination of  Net  Asset  Value,"  "Dividends,
Distributions  and  Taxes"  and "Shareholder  Services--Exchange  Privilege" for
other differences between the Classes of shares.
    
 
   
INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES
    
 
   
    Class A shares are sold at net asset value plus an initial sales charge.  In
some  cases,  reduced  sales  charges  may  be  available,  as  described below.
Investments of $1  million or  more (and  investments by  certain other  limited
categories  of investors) are  not subject to  any sales charges  at the time of
purchase but are subject to a CDSC  of 1.0% on redemptions made within one  year
after  purchase (calculated from the  last day of the  month in which the shares
were purchased), except  for certain  specific circumstances. The  CDSC will  be
assessed  on an amount  equal to the lesser  of the current  market value or the
cost of the  shares being  redeemed. The  CDSC will not  be imposed  (i) in  the
circumstances  set forth below in the  section "Contingent Deferred Sales Charge
Alternative--Class B Shares--CDSC  Waivers," except that  the references to  six
years  in the first paragraph of that section shall mean one year in the case of
Class A  shares,  and  (ii)  in the  circumstances  identified  in  the  section
"Additional  Net Asset  Value Purchase Options"  below. Class A  shares are also
subject to an annual 12b-1 fee of up to 0.25% of the average daily net assets of
the Class.
    
 
   
    The offering price of Class A shares  will be the net asset value per  share
next  determined following receipt of an  order (see "Determination of Net Asset
Value" below), plus a sales charge (expressed as a
    
   
percentage of  the offering  price) on  a  single transaction  as shown  in  the
following table:
    
 
   
<TABLE>
<CAPTION>
                                          SALES CHARGE
                           ------------------------------------------
                              PERCENTAGE OF          APPROXIMATE
    AMOUNT OF SINGLE         PUBLIC OFFERING    PERCENTAGE OF AMOUNT
       TRANSACTION                PRICE               INVESTED
- -------------------------  -------------------  ---------------------
<S>                        <C>                  <C>
Less than $25,000........           4.25%                 4.44%
$25,000 but less
     than $50,000........           4.00%                 4.17%
$50,000 but less
     than $100,000.......           3.50%                 3.63%
$100,000 but less
     than $250,000.......           2.75%                 2.83%
$250,000 but less
     than $1 million.....           1.75%                 1.78%
$1 million and over......              0                     0
</TABLE>
    
 
   
    Upon  notice to all Selected Broker-Dealers,  the Distributor may reallow up
to the  full applicable  sales charge  as  shown in  the above  schedule  during
periods  specified in such notice. During periods  when 90% or more of the sales
charge  is  reallowed,  such  Selected  Broker-Dealers  may  be  deemed  to   be
underwriters as that term is defined in the Securities Act of 1933.
    
 
   
    The  above schedule of sales charges is  applicable to purchases in a single
transaction by, among others: (a) an  individual; (b) an individual, his or  her
spouse  and their children under the age of 21 purchasing shares for his, her or
their own accounts;  (c) a trustee  or other fiduciary  purchasing shares for  a
single trust estate or a single fiduciary account; (d) a pension, profit-sharing
or  other employee benefit plan qualified  or non-qualified under Section 401 of
the Internal Revenue  Code; (e) tax-exempt  organizations enumerated in  Section
501(c)(3)  or  (13) of  the Internal  Revenue Code;  (f) employee  benefit plans
qualified  under  Section  401  of  the  Internal  Revenue  Code  of  a   single
    
 
                                       16
<PAGE>
   
employer  or of employers who are "affiliated  persons" of each other within the
meaning of Section  2(a)(3)(c) of  the Act;  and for  investments in  Individual
Retirement Accounts of employees of a single employer through Systematic Payroll
Deduction   plans;  or  (g)  any  other  organized  group  of  persons,  whether
incorporated or not,  provided the  organization has  been in  existence for  at
least  six months  and has  some purpose other  than the  purchase of redeemable
securities of a registered investment company at a discount.
    
 
   
    RIGHT OF ACCUMULATION.   The above persons and  entities may benefit from  a
reduction  of the  sales charges  in accordance with  the above  schedule if the
cumulative net asset value of Class A shares purchased in a single  transaction,
together  with Class A and Class D shares of other Dean Witter Multi-Class Funds
previously acquired which are held at  the time of such transaction, amounts  to
$25,000  or more. If such person has a cumulative net asset value of Class A and
Class D shares equal to at least $5 million, such person is eligible to purchase
Class D shares subject to the  $1,000 minimum initial investment requirement  of
that Class of the Fund. See "No Load Alternative--Class D Shares" below.
    
 
   
    The  Distributor must be notified by DWR  or a Selected Broker-Dealer or the
shareholder at the time a purchase  order is placed that the purchase  qualifies
for  the reduced  charge under the  Right of  Accumulation. Similar notification
must be made  in writing  by the  dealer or shareholder  when such  an order  is
placed  by  mail. The  reduced sales  charge will  not be  granted if:  (a) such
notification is not furnished at the time of  the order; or (b) a review of  the
records of the Selected Broker-Dealer or the Transfer Agent fails to confirm the
investor's represented holdings.
    
 
   
    LETTER OF INTENT.  The foregoing schedule of reduced sales charges will also
be  available to investors who  enter into a written  Letter of Intent providing
for the purchase, within a thirteen-month period, of Class A shares of the  Fund
from  DWR or other  Selected Broker-Dealers. The  cost of Class  A shares of the
Fund or  Class  A shares  of  other Dean  Witter  Multi-Class Funds  which  were
previously  purchased at a  price including a front-end  sales charge during the
90-day period prior to the date of  receipt by the Distributor of the Letter  of
Intent, or of Class A shares of other Dean Witter Multi-Class Funds or shares of
"Exchange  Funds" (see  "Shareholder Services--Exchange  Privilege") acquired in
exchange for  shares of  such funds  purchased  during such  period at  a  price
including  a front-end sales  charge, which are still  owned by the shareholder,
may also be included in determining the applicable reduction.
    
 
   
    ADDITIONAL NET ASSET VALUE PURCHASE  OPTIONS. In addition to investments  of
$1  million or more, Class A shares also  may be purchased at net asset value by
the following:
    
 
   
   (1) trusts for which Dean Witter Trust Company ("DWTC") or Dean Witter  Trust
FSB  ("DWTFSB")  (each  of which  is  an  affiliate of  the  Investment Manager)
provides discretionary trustee services;
    
 
   
   (2) persons participating in a fee-based program approved by the Distributor,
pursuant to which such persons pay an asset based fee for services in the nature
of investment advisory or administrative services (such investments are  subject
to  all  of  the  terms  and conditions  of  such  programs,  which  may include
termination fees and restrictions on transferability of Fund shares);
    
 
   
   (3) retirement plans qualified under  Section 401(k) of the Internal  Revenue
Code ("401(k) plans") and other employer-sponsored plans qualified under Section
401(a) of the Internal Revenue Code with at least 200 eligible employees and for
which  DWTC or DWTFSB serves as Trustee  or the 401(k) Support Services Group of
DWR serves as recordkeeper;
    
 
   
   (4) 401(k) plans and other  employer-sponsored plans qualified under  Section
401(a)  of the Internal Revenue Code for  which DWTC or DWTFSB serves as Trustee
or the 401(k) Support Services Group of DWR serves as recordkeeper whose Class B
shares have converted to Class A shares, regardless of the plan's asset size  or
number of eligible employees;
    
 
   
   (5)  investors who are clients of a  Dean Witter account executive who joined
Dean Witter from another investment firm within six months prior to the date  of
purchase  of Fund shares  by such investors,  if the shares  are being purchased
with   the   proceeds   from   a   redemption   of   shares   of   an   open-end
    
 
                                       17
<PAGE>
   
proprietary  mutual fund of the account  executive's previous firm which imposed
either a front-end  or deferred sales  charge, provided such  purchase was  made
within  sixty days after the  redemption and the proceeds  of the redemption had
been maintained in the interim in cash or a money market fund; and
    
 
   
   (6) other  categories  of investors,  at  the  discretion of  the  Board,  as
disclosed in the then current prospectus of the Fund.
    
 
   
    No  CDSC  will be  imposed on  redemptions of  shares purchased  pursuant to
paragraphs (1), (2) or (5), above.
    
 
   
    For further information concerning purchases  of the Fund's shares,  contact
DWR  or another  Selected Broker-Dealer or  consult the  Statement of Additional
Information.
    
 
   
CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE-- CLASS B SHARES
    
 
   
    Class B  shares are  sold at  net  asset value  next determined  without  an
initial  sales charge so that the full  amount of an investor's purchase payment
may be immediately invested  in the Fund.  A CDSC, however,  will be imposed  on
most  Class B shares redeemed within six  years after purchase. The CDSC will be
imposed on  any redemption  of shares  if after  such redemption  the  aggregate
current  value of  a Class  B account  with the  Fund falls  below the aggregate
amount of the investor's  purchase payments for Class  B shares made during  the
six  years (or, in the case of shares held by certain employer-sponsored benefit
plans, three years) preceding  the redemption. In addition,  Class B shares  are
subject  to an annual 12b-1 fee of 0.75%  (0.65% on amounts over $10 billion) of
the lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the Fund (not including reinvestments of dividends
or capital  gains distributions),  less the  average daily  aggregate net  asset
value  of the  Fund's Class  B shares redeemed  since the  Fund's inception upon
which a CDSC has been imposed or waived, or (b) the average daily net assets  of
Class B.
    
 
   
    Except  as noted below,  Class B shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were  purchased) will  not be subject  to any  CDSC upon  redemption.
Shares  redeemed earlier than six years  after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed.  The size of this percentage will  depend
upon how long the shares have been held, as set forth in the following table:
    
 
   
<TABLE>
<CAPTION>
           YEAR SINCE
            PURCHASE               CDSC AS A PERCENTAGE OF
          PAYMENT MADE                 AMOUNT REDEEMED
- ---------------------------------  -----------------------
<S>                                <C>
First............................              5.0%
Second...........................              4.0%
Third............................              3.0%
Fourth...........................              2.0%
Fifth............................              2.0%
Sixth............................              1.0%
Seventh and thereafter...........              None
</TABLE>
    
 
   
    In  the case of Class  B shares of the  Fund held by 401  (k) plans or other
employer-sponsored plans qualified under Section 401(a) of the Internal  Revenue
Code  for which DWTC or DWTFSB serves  as Trustee or the 401(k) Support Services
Group of DWR serves as  recordkeeper and whose accounts  are opened on or  after
July 28, 1997, shares held for three years or more after purchase (calculated as
described  in  the  paragraph  above)  will not  be  subject  to  any  CDSC upon
redemption. However, shares redeemed earlier than three years after purchase may
be subject  to a  CDSC (calculated  as described  in the  paragraph above),  the
percentage  of which will depend  on how long the shares  have been held, as set
forth in the following table:
    
 
   
<TABLE>
<CAPTION>
           YEAR SINCE
            PURCHASE               CDSC AS A PERCENTAGE OF
          PAYMENT MADE                 AMOUNT REDEEMED
- ---------------------------------  -----------------------
<S>                                <C>
First............................              2.0%
Second...........................              2.0%
Third............................              1.0%
Fourth and thereafter............              None
</TABLE>
    
 
   
    CDSC WAIVERS.    A  CDSC will  not  be  imposed on:  (i)  any  amount  which
represents an increase in value of shares purchased within the six years (or, in
the  case  of shares  held by  certain  employer-sponsored benefit  plans, three
years) preceding the  redemption; (ii)  the current  net asset  value of  shares
    
 
                                       18
<PAGE>
   
purchased  more  than six  years  (or, in  the case  of  shares held  by certain
employer-sponsored benefit  plans, three  years) prior  to the  redemption;  and
(iii)  the current net  asset value of shares  purchased through reinvestment of
dividends or  distributions and/or  shares acquired  in exchange  for shares  of
other  open-end investment companies for which InterCapital serves as investment
manager (collectively,  with the  Fund, the  "Dean Witter  Funds") sold  with  a
front-end  sales charge or of  other Dean Witter Funds  acquired in exchange for
such shares. Moreover, in  determining whether a CDSC  is applicable it will  be
assumed  that amounts described in (i), (ii) and (iii) above (in that order) are
redeemed first.
    
 
   
    In addition, the CDSC, if otherwise  applicable, will be waived in the  case
of:
    
 
   
   (1)  redemptions of  shares held  at the time  a shareholder  dies or becomes
disabled, only if  the shares  are:   (A) registered either  in the  name of  an
individual  shareholder (not a trust),  or in the names  of such shareholder and
his or her spouse as joint tenants with right of survivorship; or  (B) held in a
qualified corporate  or  self-employed retirement  plan,  Individual  Retirement
Account  ("IRA") or  Custodial Account under  Section 403(b)(7)  of the Internal
Revenue Code  ("403(b) Custodial  Account"), provided  in either  case that  the
redemption is requested within one year of the death or initial determination of
disability;
    
 
   
   (2)   redemptions   in  connection   with   the  following   retirement  plan
distributions:  (a) lump-sum or  other distributions from a qualified  corporate
or self-employed retirement plan following retirement (or, in the case of a "key
employee"  of  a "top  heavy" plan,  following  attainment of  age 59  1/2); (b)
distributions from an IRA or 403(b) Custodial
Account following attainment  of age 59  1/2; or   (c) a tax-free  return of  an
excess contribution to an IRA; and
    
 
   
   (3)  all redemptions  of shares held  for the  benefit of a  participant in a
401(k) plan or other employer-sponsored  plan qualified under Section 401(a)  of
the  Internal  Revenue Code  which offers  investment  companies managed  by the
Investment Manager  or its  subsidiary, Dean  Witter Services  Company Inc.,  as
self-directed  investment alternatives  and for which  DWTC or  DWTFSB serves as
Trustee or  the 401(k)  Support Services  Group of  DWR serves  as  recordkeeper
("Eligible  Plan"),  provided that  either:   (A)  the plan  continues to  be an
Eligible Plan after the redemption; or  (B) the redemption is in connection with
the complete termination  of the  plan involving  the distribution  of all  plan
assets to participants.
    
 
   
    With  reference to (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section  72(m)(7)
of  the  Internal Revenue  Code, which  relates  to the  inability to  engage in
gainful employment. With reference  to (2) above,  the term "distribution"  does
not  encompass a direct transfer of  IRA, 403(b) Custodial Account or retirement
plan assets to  a successor custodian  or trustee. All  waivers will be  granted
only  following receipt by the Distributor  of confirmation of the shareholder's
entitlement.
    
 
   
    CONVERSION TO CLASS A SHARES.  All shares of the Fund held prior to July 28,
1997 (other than shares  held by certain employee  benefit plans established  by
DWR  and its  affiliate, SPS  Transaction Services,  Inc.) have  been designated
Class B shares. Shares held before May 1, 1997 that have been designated Class B
shares will convert to Class A shares in May, 2007. In all other instances Class
B shares will convert automatically to Class A shares, based on the relative net
asset values of the shares of the two Classes on the conversion date, which will
be approximately ten (10) years after the date of the original purchase. The ten
year period is calculated  from the last  day of the month  in which the  shares
were purchased or, in the case of Class B shares acquired through an exchange or
a  series of  exchanges, from the  last day of  the month in  which the original
Class B shares were purchased, provided that shares originally purchased  before
May  1, 1997  will convert  to Class A  shares in  May, 2007.  The conversion of
shares purchased on or after May 1, 1997 will take place in the month  following
the tenth anniversary of the purchase. There will also be converted at that time
such  proportion of  Class B shares  acquired through  automatic reinvestment of
dividends and distributions owned by the shareholder as the total number of  his
or  her Class  B shares  converting at  the time  bears to  the total  number of
outstanding Class B shares purchased and  owned by the shareholder. In the  case
    
 
                                       19
<PAGE>
   
of  Class  B shares  held  by a  401(k)  plan or  other  employer-sponsored plan
qualified under Section 401(a) of the  Internal Revenue Code and for which  DWTC
or  DWTFSB serves as Trustee or the  401(k) Support Services Group of DWR serves
as recordkeeper, the plan is treated as a single investor and all Class B shares
will convert to Class A shares on the  conversion date of the first shares of  a
Dean  Witter Multi-Class  Fund purchased by  that plan.  In the case  of Class B
shares previously exchanged for shares  of an "Exchange Fund" (see  "Shareholder
Services--Exchange  Privilege"), the period of time  the shares were held in the
Exchange Fund (calculated from the last day  of the month in which the  Exchange
Fund  shares were acquired) is excluded  from the holding period for conversion.
If those  shares are  subsequently re-exchanged  for Class  B shares  of a  Dean
Witter Multi-Class Fund, the holding period resumes on the last day of the month
in which Class B shares are reacquired.
    
 
   
    If  a shareholder has  received share certificates for  Class B shares, such
certificates must be delivered to the Transfer Agent at least one week prior  to
the date for conversion. Class B shares evidenced by share certificates that are
not  received by the  Transfer Agent at  least one week  prior to any conversion
date will be converted into Class A shares on the next scheduled conversion date
after such certificates are received.
    
 
   
    Effectiveness of  the  conversion  feature  is  subject  to  the  continuing
availability  of  a ruling  of the  Internal  Revenue Service  or an  opinion of
counsel that (i) the  conversion of shares does  not constitute a taxable  event
under the Internal Revenue Code, (ii) Class A shares received on conversion will
have  a basis equal to  the shareholder's basis in  the converted Class B shares
immediately prior  to the  conversion,  and (iii)  Class  A shares  received  on
conversion  will have a holding  period that includes the  holding period of the
converted Class B shares. The conversion feature may be suspended if the  ruling
or  opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B 12b-1 fees.
    
 
   
    Class B shares purchased before  July 28, 1997 by  trusts for which DWTC  or
DWTFSB provides discretionary trustee services will convert to Class A shares on
or about August 29, 1997. The CDSC will not be applicable to such shares.
    
 
   
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
    
 
   
    Class  C  shares are  sold at  net  asset value  next determined  without an
initial sales charge but are subject to a CDSC of 1.0% on most redemptions  made
within  one year after  purchase (calculated from  the last day  of the month in
which the shares were purchased). The CDSC  will be assessed on an amount  equal
to  the lesser  of the  current market  value or  the cost  of the  shares being
redeemed. The CDSC will not be imposed  in the circumstances set forth above  in
the  section "Contingent Deferred Sales Charge Alternative--Class B Shares--CDSC
Waivers," except that the references to six years in the first paragraph of that
section shall mean one year  in the case of Class  C shares. Class C shares  are
subject to an annual 12b-1 fee of up to 0.75% of the average daily net assets of
the Class. Unlike Class B shares, Class C shares have no conversion feature and,
accordingly,  an investor that purchases Class C shares will be subject to 12b-1
fees applicable to  Class C shares  for an indefinite  period subject to  annual
approval by the Fund's Board of Trustees and regulatory limitations.
    
 
   
NO LOAD ALTERNATIVE--CLASS D SHARES
    
 
   
    Class  D  shares  are  offered  without  any  sales  charge  on  purchase or
redemption and  without  any 12b-1  fee.  Class D  shares  are offered  only  to
investors  meeting an initial investment minimum of $5 million and the following
categories of investors: (i) investors participating in the InterCapital  mutual
fund  asset allocation program pursuant to which such persons pay an asset based
fee;  (ii)  persons  participating  in  a  fee-based  program  approved  by  the
Distributor,  pursuant to which such persons pay an asset based fee for services
in the nature of investment advisory or administrative services (subject to  all
of the terms and conditions of such programs, which may include termination fees
and  restrictions  on  transferability  of  Fund  shares);  (iii)  401(k)  plans
established by DWR and SPS Transaction Services, Inc. (an affiliate of DWR)  for
their  employees; (iv) certain Unit Investment  Trusts sponsored by DWR; and (v)
other categories of investors, at the  discretion of the Board, as disclosed  in
the then current prospectus of the Fund.
    
 
                                       20
<PAGE>
   
Shares  of the  Fund held by  the employee  benefit plans referred  to in clause
(iii) above  prior  to  July 28,  1997  have  been designated  Class  D  shares.
Investors  who require  a $5  million minimum  initial investment  to qualify to
purchase Class D shares may satisfy that requirement by investing that amount in
a single  transaction in  Class  D shares  of the  Fund  and other  Dean  Witter
Multi-Class Funds, subject to the $1,000 minimum initial investment required for
that  Class of the Fund. In addition, for  the purpose of meeting the $5 million
minimum investment  amount,  holdings of  Class  A  shares in  all  Dean  Witter
Multi-Class  Funds, and holdings of shares of "Exchange Funds" (see "Shareholder
Services -- Exchange Privilege") for which  Class A shares have been  exchanged,
will  be included together with the  current investment amount. If a shareholder
redeems Class A shares and  purchases Class D shares,  such redemption may be  a
taxable event.
    
 
   
PLAN OF DISTRIBUTION
    
 
   
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act  with respect to the distribution of Class  A, Class B and Class C shares of
the Fund. In the case of Class A and Class C shares, the Plan provides that  the
Fund  will  reimburse the  Distributor and  others for  the expenses  of certain
activities and services incurred by them specifically on behalf of those shares.
Reimbursements for these expenses will be  made in monthly payments by the  Fund
to  the Distributor, which will in no  event exceed amounts equal to payments at
the annual rates of 0.25% and 0.75% of  the average daily net assets of Class  A
and Class C, respectively. In the case of Class B shares, the Plan provides that
the  Fund  will pay  the  Distributor a  fee, which  is  accrued daily  and paid
monthly, at the annual rate of 0.75% (0.65% on amounts over $10 billion) of  the
lesser  of: (a) the  average daily aggregate  gross sales of  the Fund's Class B
shares since the inception of the Fund (not including reinvestments of dividends
or capital  gains distributions),  less the  average daily  aggregate net  asset
value  of the  Fund's Class  B shares redeemed  since the  Fund's inception upon
which a CDSC has been imposed or waived, or (b) the average daily net assets  of
Class B. The fee is treated by the Fund as an expense in the year it is accrued.
In the case of Class A shares, the entire amount of the fee represents a service
fee  within the meaning of the NASD guidelines. In the case of Class B and Class
C shares, a portion of the fee payable pursuant to the Plan, equal to 0.20%  and
0.25% of the average daily net assets of each of these Classes, respectively, is
characterized  as a service  fee. A service  fee is a  payment made for personal
service and/or the maintenance of shareholder accounts.
    
 
   
    Additional amounts paid under the  Plan in the case of  Class B and Class  C
shares  are paid to the Distributor for services provided and the expenses borne
by the  Distributor  and others  in  the distribution  of  the shares  of  those
Classes,  including the payment of commissions for  sales of the shares of those
Classes and incentive compensation to  and expenses of DWR's account  executives
and  others  who engage  in or  support  distribution of  shares or  who service
shareholder accounts, including  overhead and telephone  expenses; printing  and
distribution of prospectuses and reports used in connection with the offering of
the  Fund's shares to other than current shareholders; and preparation, printing
and distribution of sales literature and advertising materials. In addition, the
Distributor may utilize fees paid  pursuant to the Plan in  the case of Class  B
shares to compensate DWR and other Selected Broker-Dealers for their opportunity
costs  in advancing such amounts,  which compensation would be  in the form of a
carrying charge on any unreimbursed expenses.
    
 
   
    For the fiscal  year ended December  31, 1996,  Class B shares  of the  Fund
accrued  payments under the Plan amounting to $53,189,389, which amount is equal
to 0.75%  of the  Fund's  average daily  net assets  for  the fiscal  year.  The
payments  accrued under the Plan  were calculated pursuant to  clause (b) of the
compensation formula under  the Plan.  All shares held  prior to  July 28,  1997
(other than shares held by certain employee benefit plans established by DWR and
its  affiliate, SPS  Transaction Services,  Inc.) have  been designated  Class B
shares.
    
 
   
    In the  case  of  Class  B  shares, at  any  given  time,  the  expenses  in
distributing Class B shares of the Fund may be in excess of the total of (i) the
payments  made  by the  Fund  pursuant to  the Plan,  and  (ii) the  proceeds of
contingent deferred  sales charges  paid  by investors  upon the  redemption  of
    
 
                                       21
<PAGE>
   
Class  B shares. For example, if $1  million in expenses in distributing Class B
shares of the Fund had been incurred and $750,000 had been received as described
in (i)  and  (ii)  above, the  excess  expense  would amount  to  $250,000.  The
Distributor  has  advised  the  Fund that  such  excess  amounts,  including the
carrying charge  described above,  totalled $68,120,003  at December  31,  1996,
which  was equal to  1.06% of the net  assets of the Fund  on such date. Because
there is no requirement  under the Plan that  the Distributor be reimbursed  for
all  distribution expenses  or any requirement  that the Plan  be continued from
year to year, such excess  amount does not constitute  a liability of the  Fund.
Although  there is no legal obligation for  the Fund to pay expenses incurred in
excess of payments made to the Distributor  under the Plan, and the proceeds  of
CDSCs paid by investors upon redemption of shares, if for any reason the Plan is
terminated  the Trustees will consider at that time the manner in which to treat
such expenses. Any cumulative expenses  incurred, but not yet recovered  through
distribution  fees  or  CDSCs,  may  or  may  not  be  recovered  through future
distribution fees or CDSCs.
    
 
   
    In the case of Class A and Class C shares, expenses incurred pursuant to the
Plan in any calendar year in excess of  0.25% or 0.75% of the average daily  net
assets  of Class A or Class C, respectively,  will not be reimbursed by the Fund
through payments in  any subsequent  year, except that  expenses representing  a
gross sales commission credited to account executives at the time of sale may be
reimbursed  in  the subsequent  calendar year.  No  interest or  other financing
charges will  be  incurred on  any  Class A  or  Class C  distribution  expenses
incurred  by the Distributor under the Plan  or on any unreimbursed expenses due
to the Distributor pursuant to the Plan.
    
 
   
DETERMINATION OF NET ASSET VALUE
    
 
   
    The net asset value  per share 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  by taking  the net assets  of the Fund,  dividing by the  number of shares
outstanding and adjusting to the nearest cent. The assets belonging to the Class
A, Class B, Class  C and Class D  shares will be invested  together in a  single
portfolio.  The  net asset  value  of each  Class,  however, will  be determined
separately by subtracting each Class's accrued expenses and liabilities. 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.
    
 
    In  the  calculation  of  the  Fund's net  asset  value:  (1)  all portfolio
securities for which  over-the-counter market quotations  are readily  available
are  valued  at  the bid  price;  (2)  when market  quotations  are  not readily
available,  including  circumstances  under  which  it  is  determined  by   the
Investment  Manager that sale or  bid prices are not  reflective of a security's
market value, portfolio securities are valued at their fair value as  determined
in  good faith under procedures established by and under the general supervision
of the  Fund's Board  of  Trustees (valuation  of  securities for  which  market
quotations  are not readily available may be based upon current market prices of
securities which are comparable in coupon, rating and maturity or an appropriate
matrix utilizing  similar  factors); and  (3)  short-term instruments  having  a
maturity  date of more than  sixty days are valued  on a "mark-to-market" basis,
that is, at prices  based on market quotations  for securities of similar  type,
yield,  quality and maturity, until sixty  days prior to maturity and thereafter
at amortized cost. Short-term instruments having  a maturity date of sixty  days
or less at the time of purchase are valued at amortized cost unless the Board of
Trustees determines this does not represent fair market value.
 
    Certain  of  the Fund's  portfolio securities  may be  valued by  an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix  system incorporating  security  quality, maturity  and coupon  as  the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations, in determining what it believes
is  the  fair  valuation of  the  portfolio  securities valued  by  such pricing
service.
 
                                       22
<PAGE>
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
   
    AUTOMATIC INVESTMENT  OF DIVIDENDS  AND DISTRIBUTIONS.   All  dividends  and
capital gains distributions are automatically paid in full and fractional shares
of  the applicable Class  of the Fund  (or, if specified  by the shareholder, in
shares of any other Dean Witter Fund), unless the shareholder requests that they
be paid in cash. Shares so acquired are acquired at net asset value and are  not
subject  to  the  imposition  of  a  front-end  sales  charge  or  a  CDSC  (see
"Redemptions and Repurchases"). Such dividends  and distributions will be  paid,
at  the net asset value per share, in shares of the applicable Class of the Fund
(or in cash if the shareholder so  requests) on the monthly payment date,  which
generally will be no later than the last business day of the month for which the
dividend  or  distribution  is  payable. 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.
    
 
   
    INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder
who  receives  a  cash  payment   representing  a  dividend  or  capital   gains
distribution  may  invest  such  dividend  or  distribution  in  shares  of  the
applicable Class at the net asset value per share next determined after  receipt
by  the Transfer Agent, by  returning the check or  the proceeds to the Transfer
Agent within thirty days after the payment date. Shares so acquired are acquired
at net asset value and  are not subject to the  imposition of a front-end  sales
charge or a CDSC (see "Redemptions and Repurchases.")
    
 
   
    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  or following
redemption of shares  of a  Dean Witter money  market fund,  on a  semi-monthly,
monthly  or quarterly basis, to  the Transfer Agent for  investment in shares of
the   Fund   (see   "Purchase   of    Fund   Shares"   and   "Redemptions    and
Repurchases--Involuntary Redemption").
    
 
   
    SYSTEMATIC  WITHDRAWAL PLAN.  A  systematic withdrawal plan (the "Withdrawal
Plan") is available  for shareholders  who own or  purchase shares  of the  Fund
having  a minimum value of $10,000 based  upon the then current net asset value.
The Withdrawal Plan provides  for monthly or  quarterly (March, June,  September
and  December) checks in any  dollar amount, not less than  $25, or in any whole
percentage of the account balance, on  an annualized basis. Any applicable  CDSC
will  be imposed on shares redeemed under  the Withdrawal Plan (See "Purchase of
Fund Shares"). Therefore, any shareholder  participating in the Withdrawal  Plan
will  have  sufficient shares  redeemed  from his  or  her account  so  that the
proceeds (net of any applicable CDSC) to the shareholder will be the  designated
monthly  or quarterly amount. Withdrawal plan  payments should not be considered
as  dividends,  yields   or  income.  If   periodic  withdrawal  plan   payments
continuously   exceed  net  investment   income  and  net   capital  gains,  the
shareholder's original investment will be correspondingly reduced and ultimately
exhausted. Each withdrawal constitutes  a redemption of shares  and any gain  or
loss realized must be recognized for federal income tax purposes.
    
 
    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
corporations,  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 account executive or the  Transfer
Agent.
 
   
EXCHANGE PRIVILEGE
    
 
   
    Shares  of each Class may  be exchanged for shares of  the same Class of any
other Dean Witter Multi-Class Fund without  the imposition of any exchange  fee.
Shares  may also  be exchanged  for shares of  the following  funds: Dean Witter
Short-Term U.S. Treasury Trust, Dean Witter Limited Term
    
 
                                       23
<PAGE>
   
Municipal Trust, Dean Witter Short-Term Bond Fund, Dean Witter Intermediate Term
U.S. Treasury Trust and five Dean Witter funds which are money market funds (the
"Exchange Funds").  Class A  shares may  also be  exchanged for  shares of  Dean
Witter  Multi-State  Municipal Series  Trust  and Dean  Witter  Hawaii Municipal
Trust, which are  Dean Witter  Funds sold with  a front-end  sales charge  ("FSC
Funds").  Class B shares may also be  exchanged for shares of Dean Witter Global
Short-Term Income Fund Inc., Dean Witter High Income Securities and Dean  Witter
National Municipal Trust, which are Dean Witter Funds offered with a CDSC ("CDSC
Funds"). Exchanges may be made after the shares of the Fund acquired by purchase
(not by exchange or dividend reinvestment) have been held for thirty days. There
is  no waiting period for  exchanges of shares acquired  by exchange or dividend
reinvestment.
    
 
   
    An exchange to another Dean Witter Multi-Class Fund, any FSC Fund, any  CDSC
Fund or any 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. When exchanging into a money  market fund from the Fund, shares  of
the  Fund are redeemed out of the Fund  at their next calculated net asset value
and the proceeds  of the redemption  are used  to purchase shares  of the  money
market  fund at their  net asset value determined  the following day. Subsequent
exchanges between any  of the  money market  funds and  any of  the Dean  Witter
Multi-Class  Funds, FSC Funds or  CDSC Funds or any Exchange  Fund that is not a
money market fund can be effected on the same basis.
    
 
   
    No CDSC is  imposed at  the time  of any  exchange of  shares, although  any
applicable  CDSC will be imposed upon  ultimate redemption. During the period of
time the shareholder remains in an  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  re-exchanged for  shares of a  Dean Witter  Multi-Class
Fund  or 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  Dean Witter Multi-Class Fund  or shares of a  CDSC fund are reacquired. Thus,
the CDSC is based upon the time (calculated as described above) the  shareholder
was  invested in shares of a Dean Witter Multi-Class Fund or in shares of a CDSC
fund (see "Purchase of Fund Shares"). In the case of exchanges of Class A shares
which are  subject  to  a  CDSC,  the holding  period  also  includes  the  time
(calculated  as described above) the shareholder was invested in shares of a FSC
Fund. 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 incurred on or  after
that  date  which  are  attributable  to  those  shares.  (Exchange  Fund  12b-1
distribution fees are described  in the prospectuses for  those funds.) Class  B
shares  of the  Fund acquired  in exchange  for Class  B shares  of another Dean
Witter Multi-Class  Fund  or shares  of  a CDSC  Fund  having a  different  CDSC
schedule  than that of  this Fund will  be subject to  the higher CDSC schedule,
even if such shares  are subsequently re-exchanged for  shares of the fund  with
the lower CDSC schedule.
    
 
   
    ADDITIONAL  INFORMATION REGARDING EXCHANGES.  Purchases and exchanges should
be made for  investment purposes only.  A pattern of  frequent exchanges may  be
deemed  by  the  Investment Manager  to  be  abusive and  contrary  to  the best
interests of  the Fund's  other shareholders  and, at  the Investment  Manager's
discretion,  may be limited by the Fund's refusal to accept additional purchases
and/ or  exchanges  from the  investor.  Although the  Fund  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 Fund  and  its  other
shareholders, investors should be aware that the Fund and each of the other Dean
Witter  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 Fund on a prospective basis only, upon notice to
the shareholder not later than ten days following such shareholder's most recent
exchange.  Also,  the  Exchange  Privilege  may  be  terminated  or  revised  at
    
 
                                       24
<PAGE>
any time by the Fund  and/or any of such Dean  Witter Funds for which shares  of
the  Fund have been exchanged, upon such notice as may be required by applicable
regulatory agencies.  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 Fund pledged in the margin account.
 
   
    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. Exchanges are subject to the minimum investment requirement of
each  Class of Shares and any other conditions imposed by each fund. An exchange
will be treated  for federal income  tax purposes  the same as  a repurchase  or
redemption  of shares, on  which the shareholder  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.
    
 
    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 Fund for shares of any of the Dean  Witter
Funds  (for which the Exchange Privilege is available) pursuant to this Exchange
Privilege  by  contacting  their   account  executive  (no  Exchange   Privilege
Authorization  Form is required). Other shareholders (and those shareholders who
are clients  of DWR  or another  Selected  Broker-Dealer but  who wish  to  make
exchanges  directly by writing or 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 Transfer Agent, 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  Fund  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 Fund 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 Authorization  Form and who is unable to
reach the Fund  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 case with 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.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
   
    REDEMPTION.  Shares of each  Class of the Fund can  be redeemed for cash  at
any time at the net asset value per share next determined less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see "Purchase
of  Fund Shares"). If shares are held in a shareholder's account without a share
certificate, a written request  for redemption to the  Fund's Transfer Agent  at
P.O. Box 983, Jersey City, NJ 07303 is
    
 
   
required.  If  certificates  are held  by  the  shareholder, the  shares  may be
redeemed by surrendering the certificates with a written request for redemption,
along with any additional information required by the Transfer Agent.
    
 
    REPURCHASE.   DWR  and  other  Selected  Broker-Dealers  are  authorized  to
repurchase  shares  represented  by  a  share  certificate  which  is  delivered
<PAGE>
   
to any of their offices. Shares held in a shareholder's account without a  share
certificate  may also  be repurchased by  DWR and  other Selected Broker-Dealers
upon the telephonic request of the shareholder. The repurchase price is the  net
asset  value next computed (see "Purchase of Fund Shares") after such repurchase
order is  received  by  DWR  or other  Selected  Broker-Dealer  reduced  by  any
applicable CDSC.
    
 
    The CDSC, if any, will be the only fee imposed by the Fund, the Distributor,
DWR  or  other Selected  Broker-Dealers.  The offer  by  DWR and  other Selected
Broker-Dealers to repurchase shares may be  suspended without notice by them  at
any time. In that event, shareholders may redeem their shares through the Fund's
Transfer Agent as set forth above under "Redemption."
 
    PAYMENT  FOR SHARES REDEEMED  OR REPURCHASED.   Payment for shares presented
for repurchase  or redemption  will be  made by  check within  seven days  after
receipt  by the Transfer Agent of the certificate and/or written request in good
order. Such payment may be postponed or the right of redemption suspended  under
unusual  circumstances, e.g., when normal trading is not taking place on the New
York Stock Exchange. If the shares  to be redeemed have recently been  purchased
by check, payment of the redemption proceeds 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 receipt of the check by the Transfer  Agent).
Shareholders   maintaining  margin   accounts  with  DWR   or  another  Selected
Broker-Dealer are referred to their account executive regarding restrictions  on
redemption of shares of the Fund pledged in the margin account.
 
   
    REINSTATEMENT  PRIVILEGE.   A  shareholder  who has  had  his or  her shares
redeemed or  repurchased and  has not  previously exercised  this  reinstatement
privilege  may, within 35 days  after the date of  the redemption or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares of the Fund  in the same  Class from which such  shares were redeemed  or
repurchased,  at their  net asset  value next  determined after  a reinstatement
request, together  with the  proceeds, is  received by  the Transfer  Agent  and
receive  a pro-rata credit for any CDSC  paid in connection with such redemption
or repurchase.
    
 
   
    INVOLUNTARY REDEMPTION.  The Fund reserves the right, on sixty days' notice,
to redeem, at their 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 $100, or such lesser amount as may
be fixed  by  the  Trustees  or,  in the  case  of  an  account  opened  through
EasyInvest, if after twelve months the shareholder has invested less than $1,000
in  the account.  However, before  the Fund  redeems such  shares and  sends the
proceeds to the shareholder,  it will notify the  shareholder that the value  of
the  shares is less than  the applicable amount and  allow the shareholder sixty
days to make an additional investment in an amount which will increase the value
of his or her account to at least the applicable amount before the redemption is
processed. No CDSC will be imposed on any involuntary redemption.
    
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
   
    DIVIDENDS AND DISTRIBUTIONS.   The  Fund declares  dividends separately  for
each  Class of shares from net investment income  on each day the New York Stock
Exchange is open  for business  to shareholders  of record  as of  the close  of
business  the preceding business day. The  amount of dividend may fluctuate from
day to day.  Such dividends  are paid monthly.  The Fund  intends to  distribute
substantially all of its net investment income on an annual basis.
    
    The  Fund may distribute quarterly net realized short-term capital gains, if
any, in excess of any net
 
                                       26
<PAGE>
realized long-term capital losses. The Fund intends to distribute dividends from
net long-term capital  gains, if any,  at least  once each year.  The Fund  may,
however,  elect to retain all or a portion of any net long-term capital gains in
any year  for reinvestment.  Also, the  Fund  may at  times make  payments  from
sources  other  than income  or net  capital gains.  Payments from  such sources
would, in  effect,  represent  a  return of  a  portion  of  each  shareholder's
investment.  All,  or  a portion,  of  such  payments would  not  be  taxable to
shareholders.
 
   
    All dividends and any capital gains distributions will be paid in additional
shares of the same Class and automatically credited to the shareholder's account
without issuance  of a  share  certificate unless  the shareholder  requests  in
writing  that all dividends or all dividends  and distributions be paid in cash.
Shares acquired by dividend and  distribution reinvestments will not be  subject
to  any front-end sales charge or CDSC. Class B shares acquired through dividend
and distribution reinvestments will  become eligible for  conversion to Class  A
shares  on a pro-rata  basis. Distributions paid  on Class A  and Class D shares
will be higher than  for Class B  and Class C  shares because distribution  fees
paid   by  Class   B  and   Class  C   shares  are   higher.  (See  "Shareholder
Services--Automatic Investment of Dividends and Distributions".)
    
 
    TAXES.  Because the Fund intends to distribute substantially all of its  net
investment  income and net short-term capital gains to shareholders and continue
to qualify as a regulated investment company under Subchapter M of the  Internal
Revenue  Code, it  is not  expected that the  Fund will  be required  to pay any
federal income tax on such income and capital gains.
 
    Shareholders who are  required to pay  taxes on their  income will  normally
have  to pay federal income taxes, and  any applicable state and/or local income
taxes, on  the dividends  and distributions  they receive  from the  Fund.  Such
dividends  and  distributions, to  the  extent that  they  are derived  from net
investment  income  and  net  short-term  capital  gains,  are  taxable  to  the
shareholder  as ordinary dividend  income regardless of  whether the shareholder
receives such distributions in additional shares or in cash.
 
    Distributions of  net  long-term  capital  gains, if  any,  are  taxable  to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional  shares or in cash. Capital  gains distributions are not eligible for
the corporate dividends received deduction.
 
    After the  end  of  the  calendar  year,  shareholders  will  be  sent  full
information on their dividends and capital gains distributions for tax purposes.
To  avoid  being subject  to a  31%  federal backup  withholding tax  on taxable
dividends, capital  gains  distributions and  the  proceeds of  redemptions  and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to accuracy.
 
    The   foregoing  discussion  relates  solely   to  the  federal  income  tax
consequences of an investment in the Fund. Distributions may also be subject  to
state  and local taxes; therefore, each shareholder is advised to consult his or
her own tax adviser.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
   
    From time to time the Fund may quote its "yield" and/or its"total return" in
advertisements and sales literature. These  figures are computed separately  for
Class  A, Class  B, Class C  and Class  D shares. Both  the yield  and the total
return of the  Fund are based  on historical  earnings and are  not intended  to
indicate  future performance. The yield of each Class of the Fund is computed by
dividing the Class's net  investment income over a  30-day period by an  average
value  (using the average number of shares entitled to receive dividends and the
net asset value  per share at  the end of  the period), all  in accordance  with
applicable  regulatory requirements.  Such amount  is compounded  for six months
    
 
                                       27
<PAGE>
   
and then annualized  for a twelve-month  period to derive  the Fund's yield  for
each Class.
    
 
   
    The  "average annual total return" of the Fund refers to a figure reflecting
the average annualized  percentage increase  (or decrease)  in the  value of  an
initial  investment in a Class  of the Fund of $1,000  over periods of one, five
and ten years.  Average annual total  return reflects all  income earned by  the
Fund,  any  appreciation  or depreciation  of  the Fund's  assets,  all expenses
incurred by the applicable Class and  all sales charges which would be  incurred
by  redeeming shareholders, for the stated periods. It also assumes reinvestment
of all dividends and distributions paid by the Fund.
    
 
   
    In addition to the  foregoing, the Fund may  advertise its total return  for
each  Class over different periods  of time by means  of aggregate, average, and
year-by-year or other types  of total return figures.  Such calculations may  or
may  not reflect the deduction of the CDSC which, if reflected, would reduce the
performance quoted.  The Fund  may  also advertise  the growth  of  hypothetical
investments  of $10,000,  $50,000 and  $100,000 in each  Class of  shares of the
Fund. The Fund from time to time may also advertise its performance relative  to
certain performance rankings and indexes compiled by independent organizations.
    
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
   
    VOTING  RIGHTS.  All shares of beneficial  interest of the Fund are of $0.01
par value and are equal as to earnings, assets and voting privileges except that
each Class  will  have  exclusive  voting privileges  with  respect  to  matters
relating to distribution expenses borne solely by such Class or any other matter
in  which the  interests of  one Class  differ from  the interests  of any other
Class. In addition,  Class B shareholders  will have  the right to  vote on  any
proposed  material increase in Class A's expenses, if such proposal is submitted
separately to Class A shareholders. Also, as discussed herein, Class A, Class  B
and  Class C bear the  expenses related to the  distribution of their respective
shares.
    
 
    The Fund is  not required  to hold Annual  Meetings of  Shareholders and  in
ordinary  circumstances  the Fund  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
Fund. However,  the  Declaration of  Trust  contains an  express  disclaimer  of
shareholder  liability for acts  or obligations of the  Fund, requires that Fund
obligations include  such  disclaimer,  and  provides  for  indemnification  and
reimbursement  of expenses out  of the Fund's property  for any shareholder held
personally liable  for  the  obligations  of  the Fund.  Thus,  the  risk  of  a
shareholder  incurring  financial loss  on account  of shareholder  liability is
limited to circumstances in which  the Fund itself would  be unable to meet  its
obligations.  Given the above limitations on shareholder personal liability, and
the nature of  the Fund's  assets and operations,  the possibility  of the  Fund
being  unable  to  meet  its  obligations  is  remote  and,  in  the  opinion of
Massachusetts counsel to  the Fund, the  risk to Fund  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
 
                                       28
<PAGE>
Code   of  Ethics  requires,  among   other  things,  that  personal  securities
transactions by employees of  the companies be subject  to an advance  clearance
process  to monitor that  no Dean Witter Fund  is engaged at the  same time in a
purchase or sale of the same security.  The Code of Ethics bans the purchase  of
securities in an initial public offering, and also prohibits engaging in futures
and  options  transactions  and  profiting on  short-term  trading  (that  is, a
purchase within sixty days of a sale or a sale within sixty days of a  purchase)
of  a security.  In addition,  investment personnel may  not purchase  or sell a
security for  their personal  account within  thirty days  before or  after  any
transaction  in any Dean Witter Fund managed by them. Any violations of the Code
of Ethics are subject to sanctions, including reprimand, demotion or  suspension
or  termination  of  employment. The  Code  of Ethics  comports  with regulatory
requirements and  the  recommendations in  the  1994 report  by  the  Investment
Company Institute Advisory Group on Personal Investing.
 
   
    MASTER/FEEDER  CONVERSION.  The  Fund reserves the right  to seek to achieve
its investment  objective  by  investing  all of  its  investable  assets  in  a
diversified,  open-end management investment company  having the same investment
objective and policies  and substantially  the same  investment restrictions  as
those applicable to the Fund.
    
 
    SHAREHOLDER  INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the telephone numbers or address set forth on the front cover  of
this Prospectus.
 
                                       29
<PAGE>
                        THE DEAN WITTER FAMILY OF FUNDS
 
   
<TABLE>
<S>                                                 <C>
MONEY MARKET FUNDS                                  FIXED-INCOME FUNDS
Dean Witter Liquid Asset Fund Inc.                  Dean Witter High Yield Securities Inc.
Dean Witter Tax-Free Daily Income Trust             Dean Witter Tax-Exempt Securities Trust
Dean Witter New York Municipal Money Market Trust   Dean Witter U.S. Government Securities Trust
Dean Witter California Tax-Free Daily Income Trust  Dean Witter California Tax-Free Income Fund
Dean Witter U.S. Government Money Market Trust      Dean Witter New York Tax-Free Income Fund
EQUITY FUNDS                                        Dean Witter Convertible Securities Trust
Dean Witter American Value Fund                     Dean Witter Federal Securities Trust
Dean Witter Natural Resource Development            Dean Witter World Wide Income Trust
 Securities Inc.                                    Dean Witter Intermediate Income Securities
Dean Witter Dividend Growth Securities Inc.         Dean Witter Global Short-Term Income Fund Inc.
Dean Witter Developing Growth Securities Trust      Dean Witter Multi-State Municipal Series Trust
Dean Witter World Wide Investment Trust             Dean Witter Short-Term U.S. Treasury Trust
Dean Witter Value-Added Market Series               Dean Witter Diversified Income Trust
Dean Witter Utilities Fund                          Dean Witter Limited Term Municipal Trust
Dean Witter Precious Metals and Minerals Trust      Dean Witter Short-Term Bond Fund
Dean Witter Capital Growth Securities               Dean Witter High Income Securities
Dean Witter European Growth Fund Inc.               Dean Witter National Municipal Trust
Dean Witter Pacific Growth Fund Inc.                Dean Witter Balanced Income Fund
Dean Witter Health Sciences Trust                   Dean Witter Hawaii Municipal Trust
Dean Witter Global Dividend Growth Securities       Dean Witter Intermediate Term U.S. Treasury
Dean Witter Global Utilities Fund                   Trust
Dean Witter International SmallCap Fund             DEAN WITTER RETIREMENT SERIES
Dean Witter Mid-Cap Growth Fund                     Liquid Asset Series
Dean Witter Balanced Growth Fund                    U.S. Government Money Market Series
Dean Witter Capital Appreciation Fund               U.S. Government Securities Series
Dean Witter Information Fund                        Intermediate Income Securities Series
Dean Witter Special Value Fund                      American Value Series
Dean Witter Financial Services Trust                Capital Growth Series
Dean Witter Market Leader Trust                     Dividend Growth Series
ASSET ALLOCATION FUNDS                              Strategist Series
Dean Witter Strategist Fund                         Utilities Series
Dean Witter Global Asset Allocation Fund            Value-Added Market Series
ACTIVE ASSETS ACCOUNT PROGRAM                       Global Equity Series
Active Assets Money Trust
Active Assets Tax-Free Trust
Active Assets Government Securities Trust
Active Assets California Tax-Free Trust
</TABLE>
    
 
<PAGE>
 
   
Dean Witter
U.S. Government Securities Trust
                                    Dean Witter
Two World Trade Center
New York, New York 10048
TRUSTEES                            U.S. Government
Michael Bozic                       Securities
Charles A. Fiumefreddo              Trust
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
Rajesh K. Gupta
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 -- JULY 28, 1997
 
    
<PAGE>
STATEMENT OF ADDITIONAL INFORMATION
 
   
<TABLE>
<S>                                                                <C>
JULY 28, 1997                                                         DEAN WITTER
                                                                    U.S. GOVERNMENT
                                                                    SECURITIES TRUST
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
    Dean  Witter U.S.  Government Securities Trust  (the "Fund")  is an open-end
diversified management  investment  company  whose investment  objective  is  to
provide  high  current  income consistent  with  safety of  principal.  The Fund
invests only in obligations issued or  guaranteed by the U.S. Government or  its
instrumentalities.  All such obligations are backed by the full faith and credit
of the United States Government.
 
   
    A Prospectus for  the Fund  dated July 28,  1997, which  provides the  basic
information  you  should know  before  investing in  the  Fund, may  be obtained
without charge from the Fund at its address or 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. 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  you
additional  information regarding the activities and operations of the Fund, and
should be read in conjunction with the Prospectus.
    
 
Dean Witter
U.S. Government Securities Trust
Two World Trade Center
New York, New York 10048
(212) 392-2550 or (800) 869-NEWS
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
The Fund and its Management............................................................          3
 
Trustees and Officers..................................................................          7
 
Investment Practices and Policies......................................................         13
 
Investment Restrictions................................................................         14
 
Portfolio Transactions and Brokerage...................................................         14
 
The Distributor........................................................................         16
 
Determination of Net Asset Value.......................................................         20
 
Purchase of Fund Shares................................................................         20
 
Shareholder Services...................................................................         23
 
Redemptions and Repurchases............................................................         27
 
Dividends, Distributions and Taxes.....................................................         28
 
Performance Information................................................................         30
 
Description of Shares of the Fund......................................................         31
 
Custodian and Transfer Agent...........................................................         31
 
Independent Accountants................................................................         32
 
Reports to Shareholders................................................................         32
 
Legal Counsel..........................................................................         32
 
Experts................................................................................         32
 
Registration Statement.................................................................         32
 
Report of Independent Accountants......................................................         33
 
Financial Statements -- December 31, 1996..............................................         34
</TABLE>
    
 
                                       2
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
THE FUND
 
    The  Fund 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
September 29, 1983.
 
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 Fund's Investment  Manager. InterCapital  is a wholly-owned
subsidiary of Morgan Stanley, Dean Witter, Discover & Co. ("MSDWD"), a  Delaware
corporation.  In an internal  reorganization which took  place in January, 1993,
InterCapital assumed  the  investment advisory,  administrative  and  management
activities  previously  performed by  the InterCapital  Division of  Dean Witter
Reynolds  Inc.  ("DWR"),   a  broker-dealer  affiliate   of  InterCapital.   (As
hereinafter  used  in  this  Statement  of  Additional  Information,  the  terms
"InterCapital" and  "Investment Manager"  refer to  DWR's InterCapital  Division
prior   to  the  internal  reorganization  and  Dean  Witter  InterCapital  Inc.
thereafter.) The  daily management  of the  Fund and  research relating  to  the
Fund's portfolio are conducted by or under the direction of officers of the Fund
and of the Investment Manager, subject to periodic review by the Fund's Board of
Trustees.  Information as to these Trustees  and officers is contained under the
caption "Trustees and Officers."
    
 
    The Investment Manager is  the investment manager  or investment adviser  of
the following investment companies:
 
OPEN-END FUNDS
 
   
<TABLE>
<C>        <S>
       1.  Active Assets California Tax-Free Trust
       2.  Active Assets Government Securities
            Trust
       3.  Active Assets Money Trust
       4.  Active Assets Tax-Free Trust
       5.  Dean Witter American Value Fund
       6.  Dean Witter Balanced Growth Fund
       7.  Dean Witter Balanced Income Fund
       8.  Dean Witter California Tax-Free Daily
            Income Trust
       9.  Dean Witter California Tax-Free Income
            Fund
      10.  Dean Witter Capital Appreciation Fund
      11.  Dean Witter Capital Growth Securities
      12.  Dean Witter Convertible Securities Trust
      13.  Dean Witter Developing Growth Securities
            Trust
      14.  Dean Witter Diversified Income Trust
      15.  Dean Witter Dividend Growth Securities
            Inc.
      16.  Dean Witter European Growth Fund Inc.
      17.  Dean Witter Federal Securities Trust
      18.  Dean Witter Financial Services Trust
      19.  Dean Witter Global Asset Allocation Fund
      20.  Dean Witter Global Dividend Growth
            Securities
      21.  Dean Witter Global Short-Term Income
            Fund Inc.
      22.  Dean Witter Global Utilities Fund
      23.  Dean Witter Hawaii Municipal Trust
      24.  Dean Witter Health Sciences Trust
      25.  Dean Witter High Income Securities
      26.  Dean Witter High Yield Securities Inc.
      27.  Dean Witter Income Builder Fund
      28.  Dean Witter Information Fund
      29.  Dean Witter Intermediate Income
            Securities
      30.  Dean Witter Intermediate Term U.S.
            Treasury Trust
      31.  Dean Witter International SmallCap Fund
      32.  Dean Witter Japan Fund
      33.  Dean Witter Limited Term Municipal Trust
      34.  Dean Witter Liquid Asset Fund Inc.
      35.  Dean Witter Market Leader Trust
      36.  Dean Witter Mid-Cap Growth Fund
      37.  Dean Witter Multi-State Municipal Series
            Trust
      38.  Dean Witter National Municipal Trust
      39.  Dean Witter Natural Resource Development
            Securities Inc.
      40.  Dean Witter New York Municipal Money
            Market Trust
      41.  Dean Witter New York Tax-Free Income
            Fund
      42.  Dean Witter Pacific Growth Fund Inc.
      43.  Dean Witter Precious Metals and Minerals
            Trust
      44.  Dean Witter Retirement Series
</TABLE>
    
 
                                       3
<PAGE>
   
<TABLE>
<C>        <S>
      45.  Dean Witter Select Dimensions Investment
            Series
      46.  Dean Witter Select Municipal
            Reinvestment Fund
      47.  Dean Witter Short-Term Bond Fund
      48.  Dean Witter Short-Term U.S. Treasury
            Trust
      49.  Dean Witter Special Value Fund
      50.  Dean Witter Strategist Fund
      51.  Dean Witter Tax-Exempt Securities Trust
      52.  Dean Witter Tax-Free Daily Income Trust
      53.  Dean Witter U.S. Government Money Market
            Trust
      54.  Dean Witter U.S. Government Securities
            Trust
      55.  Dean Witter Utilities Fund
      56.  Dean Witter Value-Added Market Series
      57.  Dean Witter Variable Investment Series
      58.  Dean Witter World Wide Income Trust
      59.  Dean Witter World Wide Investment Trust
</TABLE>
    
 
CLOSED-END FUNDS
 
   
<TABLE>
<C>        <S>
       1.  High Income Advantage Trust
       2.  High Income Advantage Trust II
       3.  High Income Advantage Trust III
       4.  InterCapital Income Securities Inc.
       5.  Dean Witter Government Income Trust
       6.  InterCapital Insured Municipal Bond
            Trust
       7.  InterCapital Insured Municipal Trust
       8.  InterCapital Insured Municipal Income
            Trust
       9.  InterCapital California Insured
            Municipal Income Trust
      10.  InterCapital Insured Municipal
            Securities
      11.  InterCapital Insured California
            Municipal Securities
      12.  InterCapital Quality Municipal
            Investment Trust
      13.  InterCapital Quality Municipal Income
            Trust
      14.  InterCapital Quality Municipal
            Securities
      15.  InterCapital California Quality
            Municipal Securities
      16.  InterCapital New York Quality Municipal
            Securities
      17.  Municipal Income Trust
      18.  Municipal Income Trust II
      19.  Municipal Income Trust III
      20.  Municipal Income Opportunities Trust
      21.  Municipal Income Opportunities II
      22.  Municipal Income Opportunities III
      23.  Prime Income Trust
      24.  Municipal Premium Income Trust
</TABLE>
    
 
    The foregoing investment companies, together with the Fund, 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 (the "TCW/DW Funds"):
 
   
<TABLE>
<C>        <S>
OPEN-END FUNDS
       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 Mid-Cap Equity Trust
       8.  TCW/DW Global Telecom Trust
       9.  TCW/DW Strategic Income Trust
 
CLOSED-END FUNDS
      10.  TCW/DW Term Trust 2000
      11.  TCW/DW Term Trust 2002
      12.  TCW/DW Term Trust 2003
      13.  TCW/DW Total Return Trust
      14.  TCW/DW Emerging Markets Opportunities
            Trust
</TABLE>
    
 
    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 Fund has retained  the Investment Manager to manage  the
investment of the Fund's assets,
 
                                       4
<PAGE>
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  Fund
in a manner consistent with its investment objective and policies.
 
    Under  the  terms  of the  Agreement,  in  addition to  managing  the Fund's
investments, the Investment Manager  maintains certain of  the Fund's books  and
records  and  furnishes,  at its  own  expense, such  office  space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including 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 Fund, 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 Fund.
 
    Effective December  31,  1993,  pursuant to  a  Services  Agreement  between
InterCapital  and DWSC, DWSC began to provide the administrative services to the
Fund 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  Fund or any of the
fees being paid by the Fund 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 Fund's  shares,  Dean Witter  Distributors Inc.
("Distributors" or the "Distributor") (see  "The Distributor"), will be paid  by
the  Fund. These expenses will be allocated  among the four classes of shares of
the Fund  (each, a  "Class")  pro rata  based  on the  net  assets of  the  Fund
attributable to each Class, except as described below. The expenses borne by the
Fund  include, but  are not  limited to:  expenses of  the Plan  of Distribution
pursuant to Rule 12b-1  (the "12b-1 fee") (see  "The Distributor"); charges  and
expenses  of any  registrar, custodian,  stock transfer  and dividend disbursing
agent; brokerage commissions; taxes; engraving and printing share  certificates;
registration costs of the Fund and its shares under federal and state securities
laws;  the cost and expense of printing, including typesetting, and distributing
prospectuses  and  statements  of  additional   information  of  the  Fund   and
supplements  thereto to the  Fund's shareholders; all  expenses of shareholders'
and  Trustees'  meetings  and  of  preparing,  printing  and  mailing  of  proxy
statements  and reports to shareholders; fees and travel expenses of Trustees or
members of  any  advisory  board or  committee  who  are not  employees  of  the
Investment  Manager or  any corporate affiliate  of the  Investment Manager; all
expenses incident to any dividend, withdrawal or redemption options; charges and
expenses of any outside service used for pricing of the Fund's shares; fees  and
expenses  of  legal  counsel, including  counsel  to  the Trustees  who  are not
interested persons  of the  Fund 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  Fund  borrowings;  postage;  insurance  premiums  on  property  or
personnel (including  officers and  Trustees) of  the Fund  which inure  to  its
benefit; extraordinary expenses (including, but not limited to, legal claims and
liabilities  and litigation costs and any indemnification relating thereto); and
all other costs of the Fund's operation. The 12b-1 fees relating to a particular
Class will be  allocated directly  to that  Class. In  addition, other  expenses
associated  with a particular  Class (except advisory or  custodial fees) may be
allocated directly to  that Class,  provided that such  expenses are  reasonably
identified  as specifically attributable to that Class and the direct allocation
to that Class is approved by the Trustees.
    
 
    As full compensation for the services  and facilities furnished to the  Fund
and  expenses of the Fund  assumed by the Investment  Manager, the Fund pays the
Investment  Manager  monthly  compensation  calculated  daily  by  applying  the
following annual rates to the Fund's daily net assets pursuant to the Agreement:
0.50%  of the portion of such daily  net assets not exceeding $1 billion; 0.475%
of the portion
 
                                       5
<PAGE>
of such daily net  assets exceeding $1 billion  but not exceeding $1.5  billion;
0.45%  of the portion  of such daily  net assets exceeding  $1.5 billion but not
exceeding $2 billion; 0.425% of the  portion of such daily net assets  exceeding
$2  billion but not exceeding $2.5 billion;  0.40% of that portion of such daily
net assets exceeding $2.5 billion but  not exceeding $5 billion; 0.375% of  that
portion  of such daily  net assets exceeding  $5 billion but  not exceeding $7.5
billion; 0.35% of that portion of  such daily net assets exceeding $7.5  billion
but  not exceeding $10 billion; 0.325% of  that portion of such daily net assets
exceeding $10 billion but not exceeding $12.5 billion; and 0.30% of that portion
of such daily  net assets exceeding  $12.5 billion. For  the fiscal years  ended
December  31, 1994, 1995  and 1996, the  Fund accrued to  the Investment Manager
total compensation of $40,553,081, $33,295,918 and $29,579,546, 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 Fund or any of its investors for any act
or omission by the Investment Manager or for any losses sustained by the Fund or
its  investors.  The Agreement  does not  restrict  the Investment  Manager from
acting as investment manager or adviser to others.
 
   
    The Agreement was initially  approved by the Trustees  on February 21,  1997
and by the shareholders of the Fund at a Special Meeting of Shareholders held on
May  21, 1997.  The Agreement is  substantially identical to  a prior investment
management agreement which was initially approved by the Trustees on October 30,
1992 and by the shareholders  of the Fund at  a Special Meeting of  Shareholders
held  on January 12,  1993. The Agreement took  effect on May  31, 1997 upon the
consummation of the merger  of Dean Witter, Discover  & Co. with Morgan  Stanley
Group  Inc. The  Agreement may  be terminated at  any time,  without penalty, on
thirty days' notice by the  Board of Trustees of the  Fund, by the holders of  a
majority,  as defined in the Investment Company  Act of 1940 (the "Act"), of the
outstanding shares of the Fund, or by the Investment Manager. The Agreement will
automatically terminate in the event of its assignment (as defined in the Act).
    
 
   
    Under its terms, the Agreement has an initial term ending April 30, 1999 and
will remain 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 Fund, or by the Board
of Trustees  of the  Fund; provided  that in  either event  such continuance  is
approved  annually by the vote of a majority of the Trustees of the Fund who are
not parties to the Agreement or "interested persons" (as defined in the Act)  of
any  such party (the "Independent Trustees"), which  vote must be cast in person
at a meeting called for the purpose of voting on such approval.
    
 
    The Fund has acknowledged that the name "Dean Witter" is a property right of
DWR. The Fund has agreed that DWR or its parent company may use or, at any time,
permit others to use, the name "Dean  Witter." The Fund has also agreed that  in
the   event  the  Agreement  is  terminated,   or  if  the  affiliation  between
InterCapital and its parent company is  terminated, the Fund will eliminate  the
name "Dean Witter" from its name if DWR or its parent company shall so request.
 
                                       6
<PAGE>
TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------
 
   
    The  Trustees and Executive  Officers of the  Fund, their principal business
occupations during the  last five  years and  their affiliations,  if any,  with
InterCapital and with the 83 Dean Witter Funds and the 14 TCW/DW Funds are shown
below.
    
 
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND 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,  and   President  and   Chief  Operating  Officer
                                          (1987-1991) of the Sears Merchandise Group of Sears, Roebuck and  Co.;
                                          Director  of  Eaglemark  Financial Services,  Inc.,  the  United Negro
                                          College Fund and Weirton Steel Corporation.
 
Charles A. Fiumefreddo* (64)              Chairman, Chief Executive Officer  and Director of InterCapital,  DWSC
Chairman of the Board, President,         and  Distributors;  Executive  Vice  President  and  Director  of DWR;
Chief Executive Officer and Trustee       Chairman, Director or Trustee,  President and Chief Executive  Officer
Two World Trade Center                    of  the  Dean  Witter  Funds; Chairman,  Chief  Executive  Officer and
New York, New York                        Trustee of  the TCW/DW  Funds; Chairman  and Director  of Dean  Witter
                                          Trust  Company  ("DWTC");  Director and/or  officer  of  various MSDWD
                                          subsidiaries; formerly Executive Vice  President and Director of  Dean
                                          Witter, Discover & Co. (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 Chemical 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  Chemical  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 Committee 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>
    
 
                                       7
<PAGE>
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
Wayne E. Hedien** (63)                    Retired; Director or Trustee of  the Dean Witter Funds (commencing  on
Trustee                                   September  1, 1997); Director of The PMI Group, Inc. (private mortgage
c/o Gordon Altman Butowsky                insurance); Trustee and Vice Chairman  of The Field Museum of  Natural
 Weitzen Shalov & Wein                    History;  formerly associated with the Allstate Companies (1966-1994),
Counsel to the Independent Trustees       most  recently  as  Chairman  of  The  Allstate  Corporation   (March,
114 West 47th Street                      1993-December,  1994) and Chairman and  Chief Executive Officer of its
New York, New York                        wholly-owned   subsidiary,   Allstate    Insurance   Company    (July,
                                          1989-December,   1994);  director   of  various   other  business  and
                                          charitable organizations.
 
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 of the Financial Accounting Standards  Board);
                                          formerly  Vice  Chairman  of the  Board  of Governors  of  the Federal
                                          Reserve  System  (1986-1990)  and  Assistant  Secretary  of  the  U.S.
                                          Treasury (1982-1986).
 
Michael E. Nugent (61)                    General   Partner,   Triumph  Capital,   LP.,  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                                   MSDWD, 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 MSDWD 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).
Counsel to the Independent Trustees
114 West 47th Street
New York, New York
</TABLE>
    
 
                                       8
<PAGE>
   
<TABLE>
<CAPTION>
   NAME, AGE, POSITION WITH FUND AND
                ADDRESS                                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ----------------------------------------  ----------------------------------------------------------------------
<S>                                       <C>
Barry Fink (42)                           Senior  Vice President (since  March, 1997) and  Secretary and General
Vice President, Secretary                 Counsel (since February, 1997) of  InterCapital and DWSC; Senior  Vice
  and General Counsel                     President  (since March,  1997) and Assistant  Secretary and Assistant
Two World Trade Center                    General Counsel  (since  February, 1997)  of  Distributors;  Assistant
New York, New York                        Secretary  of DWR (since August,  1996); Vice President, Secretary and
                                          General Counsel of the Dean Witter Funds and the TCW/ DW Funds  (since
                                          February, 1997); previously First Vice President (June, 1993-February,
                                          1997),  Vice President (until June,  1993) and Assistant Secretary and
                                          Assistant General  Counsel  of  InterCapital and  DWSC  and  Assistant
                                          Secretary of the Dean Witter Funds and the TCW/DW Funds.
 
Rajesh K. Gupta (37)                      Senior  Vice President of InterCapital; Vice President of various Dean
Vice President                            Witter Funds.
Two World Trade Center
New York, New York
 
Thomas F. Caloia (51)                     First Vice President and Assistant Treasurer of InterCapital and DWSC;
Treasurer                                 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 Fund, as defined in  the
  Act.
    
   
**Mr. Hedien's term as Trustee will commence on September 1, 1997.
    
 
   
    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, Mitchell  M. Merin, President and  Chief Strategic Officer of
InterCapital and DWSC,  Executive Vice  President of Distributors  and DWTC  and
Director  of DWTC, Executive Vice President and Director of DWR, Director of SPS
Transaction Services,  Inc.  and various  other  MSDWD subsidiaries,  Joseph  J.
McAlinden, Executive Vice President and Chief Investment Officer of InterCapital
and   Director  of  DWTC,   Robert  S.  Giambrone,   Senior  Vice  President  of
InterCapital, DWSC, Distributors  and DWTC and  Director of DWTC,  and Peter  M.
Avelar,  Jonathan  R. Page  and  James F.  Willison,  Senior Vice  Presidents of
InterCapital, are Vice  Presidents of the  Fund, and Marilyn  K. Cranney,  First
Vice  President and Assistant General Counsel of InterCapital and DWSC, Lou Anne
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 Fund.
    
 
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
 
   
    The Board of  Trustees currently consists  of eight (8)  trustees; as  noted
above,  Mr.  Hedien's  term  will  commence on  September  1,  1997.  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 83 Dean Witter  Funds,
comprised  of 126  portfolios. As of  June 30,  1997, the Dean  Witter Funds had
total net  assets  of approximately  $     billion  and more  than  six  million
shareholders.
    
 
   
    Six Trustees and Mr. Hedien (77% of the total number) have no affiliation or
business  connection with InterCapital  or any of its  affiliated persons and do
not own any stock or other  securities issued by InterCapital's parent  company,
MSDWD.  These are the  "disinterested" or "independent"  Trustees. The other two
Trustees (the "management Trustees") are  affiliated with InterCapital. Four  of
the six independent Trustees are also Independent Trustees of the TCW/DW Funds.
    
 
                                       9
<PAGE>
    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 current  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.
 
    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.
 
                                       10
<PAGE>
    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  Fund 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 Fund 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 Fund 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
Fund  who are or have  been employed by the  Investment Manager or an affiliated
company receive no compensation or expense reimbursement from the Fund.
 
    The  following  table  illustrates  the  compensation  paid  to  the  Fund's
Independent Trustees by the Fund for the fiscal year ended December 31, 1996.
 
                               FUND COMPENSATION
 
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,800
Edwin J. Garn.................................................       1,850
John R. Haire.................................................       3,950
Dr. Manuel H. Johnson.........................................       1,800
Michael E. Nugent.............................................       1,800
John L. Schroeder.............................................       1,800
</TABLE>
 
    The  following  table  illustrates  the  compensation  paid  to  the  Fund'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
 
                                       11
<PAGE>
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
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
<S>                          <C>                <C>                <C>              <C>             <C>
Michael Bozic..............      $138,850           --                 --               --            $138,850
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 Fund, have adopted a retirement program under  which
an  Independent Trustee who  retires after serving  for at least  five years (or
such lesser period as may be determined by the Board) as an Independent Director
or Trustee of any Dean Witter Fund that has adopted the retirement program (each
such Fund referred to as an "Adopting Fund" and each such Trustee referred to as
an "Eligible  Trustee") is  entitled to  retirement payments  upon reaching  the
eligible  retirement age (normally, after attaining age 72). Annual payments are
based upon length of service. Currently, upon retirement, each Eligible  Trustee
is  entitled to  receive from  the Adopting  Fund, commencing  as of  his or her
retirement date and continuing for the remainder  of his or her life, an  annual
retirement benefit (the "Regular Benefit") equal to 25.0% of his or her Eligible
Compensation  plus 0.4166666% of such Eligible  Compensation for each full month
of service as an Independent Director or Trustee of any Adopting Fund in  excess
of five years up to a maximum of 50.0% after ten years of service. The foregoing
percentages may be changed by the Board.(1) "Eligible Compensation" is one-fifth
of  the total compensation  earned by such  Eligible Trustee for  service to the
Adopting Fund  in  the five  year  period prior  to  the date  of  the  Eligible
Trustee's  retirement. Benefits under the retirement  program are not secured or
funded by the Adopting Funds.
 
- ---------------
   
(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.
    
 
                                       12
<PAGE>
    The  following  table illustrates  the  retirement benefits  accrued  to the
Fund's Independent Trustees by the Fund  for the fiscal year ended December  31,
1996  and by the  57 Dean Witter Funds  (including the Fund)  for the year ended
December 31,  1996,  and  the  estimated  retirement  benefits  for  the  Fund's
Independent  Trustees, to  commence upon their  retirement, from the  Fund as of
December 31, 1996 and from the 57 Dean Witter Funds as of December 31, 1996.
 
   
          RETIREMENT BENEFITS FROM THE FUND AND ALL DEAN WITTER FUNDS
    
 
<TABLE>
<CAPTION>
                                            FOR ALL ADOPTING FUNDS                RETIREMENT BENEFITS          ESTIMATED ANNUAL
                                    --------------------------------------        ACCRUED AS EXPENSES              BENEFITS
                                         ESTIMATED                                                            UPON RETIREMENT(2)
                                      CREDITED YEARS         ESTIMATED       -----------------------------   ---------------------
                                       OF SERVICE AT       PERCENTAGE OF                         BY ALL        FROM      FROM ALL
                                        RETIREMENT           ELIGIBLE           BY THE          ADOPTING        THE      ADOPTING
NAME OF INDEPENDENT TRUSTEE            (MAXIMUM 10)        COMPENSATION          FUND            FUNDS         FUND        FUNDS
- ----------------------------------  -------------------  -----------------   ------------     ------------   ---------   ---------
<S>                                 <C>                  <C>                 <C>              <C>            <C>         <C>
Michael Bozic.....................              10               50.0%       $        381     $     20,147   $     950   $  51,325
Edwin J. Garn.....................              10               50.0                 553           27,772         950      51,325
John R. Haire.....................              10               50.0                (282)(3)       46,952       2,343     129,550
Dr. Manuel H. Johnson.............              10               50.0                 231           10,926         950      51,325
Michael E. Nugent.................              10               50.0                 396           19,217         950      51,325
John L. Schroeder.................               8               41.7                 736           38,700         792      42,771
</TABLE>
 
- ---------------
   
(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 Fund owned by the Fund's officers
and  Trustees  as a  group  was less  than  1 percent  of  the Fund's  shares of
beneficial interest outstanding.
 
INVESTMENT PRACTICES AND POLICIES
- --------------------------------------------------------------------------------
 
    As discussed in  the Prospectus,  the Fund  may only  invest in  obligations
issued  or guaranteed  by the  U.S. Government  or its  instrumentalities ("U.S.
Government Securities"). All such obligations are backed by the "full faith  and
credit"  of  the  United  States.  Investments may  be  made  in  obligations of
instrumentalities of  the  U.S.  Government  only  where  such  obligations  are
guaranteed by the U.S. Government.
 
    ZERO  COUPON  SECURITIES.    A portion  of  the  U.S.  Government securities
purchased by the  Fund may be  "zero coupon" Treasury  securities with  maturity
dates  in each  case no later  than ten years  from the settlement  date for the
purchase of such security. These are U.S. Treasury bills, notes and bonds  which
have been stripped of their unmatured interest coupons and receipts or which are
certificates  representing  interests  in  such  stripped  debt  obligations and
coupons. "Zero coupon" securities  are purchased at a  discount from their  face
amount,  giving the purchaser the right to receive their full value at maturity.
A zero coupon security pays no interest to its holder during its life. Its value
to an investor consists of the difference between its face value at the time  of
maturity  and the price for which it  was acquired, which is generally an amount
significantly less  than  its face  value  (sometimes  referred to  as  a  "deep
discount" price).
 
    The  interest  earned  on  such  securities  is,  implicitly,  automatically
compounded and paid out at maturity.  While such compounding at a constant  rate
eliminates  the risk of receiving lower  yields upon reinvestment of interest if
prevailing interest rates decline, the owner  of a zero coupon security will  be
unable to participate in higher yields upon reinvestment of interest received if
prevailing  interest rates  rise. For  this reason,  zero coupon  securities are
subject to substantially  greater market  price fluctuations  during periods  of
changing  prevailing interest  rates than  are comparable  debt securities which
make current distributions of interest. Current federal tax law requires that  a
holder  (such as  the Fund) of  a zero coupon  security accrue a  portion of the
discount at which the security was purchased as income each year even though the
Fund receives no interest payments in cash on the security during the year.
 
                                       13
<PAGE>
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    The investment restrictions listed  below have been adopted  by the Fund  as
fundamental policies, which may not be changed without the vote of a majority of
the  outstanding voting securities  of the Fund,  as defined in  the Act. Such a
majority is defined as the lesser of (a) 67% of the shares present at a  meeting
of  shareholders, if the holders  of more than 50%  of the outstanding shares of
the Fund  are present  or represented  by proxy,  or (b)  more than  50% of  the
outstanding  shares of the Fund. For  purposes of the following restrictions (a)
an "issuer" of a security is the entity whose assets and revenues are  committed
to  the payment of interest and  principal on that particular security, provided
that the guarantee of a security will be considered a separate security; and (b)
all percentage  limitations  apply  immediately  after  a  purchase  or  initial
investment,  and any  subsequent change  in any  applicable percentage resulting
from market  fluctuations or  other changes  in  total or  net assets  does  not
require elimination of any security from the portfolio.
 
    The Fund may not:
 
         1.  Purchase any securities other than obligations issued or guaranteed
    by the United  States Government. Such  obligations are backed  by the  full
    faith  and credit of the  United States. There is no  limit on the amount of
    its assets which may be invested in the securities of any one issuer of such
    obligations.
 
         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.  Borrowing in the aggregate may  not
    exceed  20%, and borrowing  for purposes other  than meeting redemptions may
    not exceed 5%, of the value of the Fund's total assets (including the amount
    borrowed) at  the time  the borrowing  is  made. It  is the  Fund's  current
    intention  not  to  borrow  for  other  than  meeting  redemptions requests.
    Borrowings in excess of 5% will be repaid before additional investments  are
    made. Interest on borrowings will reduce net investment income.
 
         3.  Pledge,  hypothecate, mortgage  or  otherwise encumber  its assets,
    except in an amount  not exceeding 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. Make loans to others except through the purchase of debt obligations
    in accordance with the Fund's investment objective and policies.
 
         6.  Issue senior securities as defined in the Act except insofar as the
    Fund may be  deemed to have  a senior  security by reason  of (a)  borrowing
    money  in  accordance  with  restriction  (2)  described  above,  or  (b) by
    purchasing  securities  on  a  when-issued  or  delayed  delivery  basis  or
    purchasing or selling securities on a forward commitment basis.
 
         7.  Underwrite the securities  of other issuers  or purchase restricted
    securities.
 
         8. Purchase or sell real estate or interests therein, although the Fund
    may purchase securities of  issuers which engage  in real estate  operations
    and securities which are secured by real estate or interests therein.
 
   
    Notwithstanding  any other  investment policy  or restriction,  the Fund may
seek to achieve its investment objective  by investing all or substantially  all
of  its  assets  in another  investment  company having  substantially  the same
investment objective and policies as the Fund.
    
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
- --------------------------------------------------------------------------------
 
    Subject to the general supervision of the Board of Trustees of the Fund, the
Investment Manager is responsible for  the investment decisions and the  placing
of  the orders  for portfolio  transactions for  the Fund.  The Fund's portfolio
transactions will occur primarily with issuers, underwriters or major dealers in
 
                                       14
<PAGE>
U.S. Government Securities acting as principals. Such transactions are  normally
on  a net basis which 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. During the fiscal years ended  December
31, 1994, 1995 and 1996, the Fund did not pay 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 Fund
and others whose  assets it manages  in such  manner as it  deems equitable.  In
making  such  allocations  among the  Fund  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 Fund 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 Fund, regarding purchases and sales of securities for  its
portfolio,  is  that  primary  consideration  be  given  to  obtaining  the most
favorable  prices  and  efficient  execution  of  transactions.  In  seeking  to
implement  the Fund'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 Fund or the Investment  Manager. Such services may include, but
are not limited  to, any one  or more of  the following: information  as to  the
availability  of  securities  for  purchase  or  sale;  statistical  or  factual
information or opinions pertaining to investment; wire services; and  appraisals
or evaluations of portfolio securities.
 
    The information and services received by the Investment Manager from brokers
and  dealers may be  of benefit to  the Investment Manager  in the management of
accounts of some of its  other clients and may not,  in every case, benefit  the
Fund  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 Fund does not reduce the management fee it
pays to the Investment  Manager by any  amount that may  be attributable to  the
value of such services.
 
    Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect  principal transactions in certain money market instruments with DWR. The
Fund will limit its  transactions with DWR to  U.S. Government Securities.  Such
transactions will be effected with DWR only when the price available from DWR is
better than that available from other dealers.
 
    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 portfolio transactions for  the
Fund,  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  Fund,
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. For the fiscal years ended December 31, 1994, 1995 and 1996,
the Fund did not effect any securities transactions with or through DWR.
 
                                       15
<PAGE>
THE DISTRIBUTOR
- --------------------------------------------------------------------------------
 
   
    As discussed in the Prospectus, shares  of the Fund are distributed by  Dean
Witter Distributors Inc. (the "Distributor"). The Distributor has entered into a
selected  dealer agreement  with DWR, which  through its  own sales organization
sells shares of the Fund. In  addition, the Distributor may enter into  selected
dealer  agreements  with  other  selected  broker-dealers.  The  Distributor,  a
Delaware corporation, is a  wholly-owned subsidiary of  MSDWD. The Trustees  who
are not, and were not at the time they voted, interested persons of the Fund, as
defined in the Act (the "Independent Trustees"), approved, at their meeting held
on                   , 1997, the  current Distribution  Agreement appointing the
Distributor as exclusive distributor of the Fund's shares and providing for  the
Distributor  to bear distribution expenses not borne  by the Fund. By its terms,
the Distribution Agreement has  an initial term ending  April 30, 1998 and  will
remain in effect from year to year thereafter if approved by the Board.
    
 
   
    The  Distributor bears all expenses incurred in providing services under the
Distribution Agreement. Such  expenses include  the payment  of commissions  for
sales of the Fund's shares and incentive compensation to account executives. The
Distributor  also pays certain  expenses in connection  with the distribution of
the Fund's shares, including the  costs of preparing, printing and  distributing
advertising or promotional materials, and the costs of printing and distributing
prospectuses  and supplements thereto  used in connection  with the offering and
sale of the Fund's shares to other than current shareholders. The Fund bears the
costs of  initial typesetting,  printing and  distribution of  prospectuses  and
supplements   thereto  to  shareholders.  The  Fund  also  bears  the  costs  of
registering the  Fund and  its shares  under federal  securities laws  and  pays
filing  fees  in  accordance  with  state  securities  laws.  The  Fund  and the
Distributor have agreed  to indemnify  each other  against certain  liabilities,
including  liabilities under the  Securities Act of 1933,  as amended. Under the
Distribution Agreement,  the  Distributor uses  its  best efforts  in  rendering
services  to the  Fund, but  in the absence  of willful  misfeasance, bad faith,
gross negligence or reckless  disregard of its  obligations, the Distributor  is
not  liable to the Fund 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
Fund or its shareholders.
    
 
PLAN OF DISTRIBUTION
 
   
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act  (the "Plan")  pursuant to which  each Class,  other than Class  D, pays the
Distributor compensation  accrued daily  and payable  monthly at  the  following
annual  rates: 0.25% and  0.75% of the average  daily net assets  of Class A and
Class C, respectively,  and, with respect  to Class B,  0.75% (0.65% of  amounts
over  $10 billion) of the lesser of: (a) the average daily aggregate gross sales
of the Fund's  Class B shares  since the  inception of the  Fund (not  including
reinvestments  of dividends  or capital  gains distributions),  less the average
daily aggregate net asset value of the Fund's Class B shares redeemed since  the
Fund's  inception upon which a contingent deferred sales charge has been imposed
or upon which such charge has been  waived, or (b) the average daily net  assets
of  the Fund. The Distributor also  receives the proceeds of contingent deferred
sales charges imposed on certain redemptions  of shares, which are separate  and
apart  from payments made pursuant to the Plan (see "Purchase of Fund Shares" in
the Prospectus).  The Distributor  has  informed the  Fund  that it  and/or  DWR
received  approximately  $23,000,000, $10,629,000  and $8,964,262  in contingent
deferred sales charges for  the fiscal years ended  December 31, 1994, 1995  and
1996, respectively, none of which was retained by the Distributor.
    
 
   
    The Distributor has informed the Fund that the entire fee payable by Class A
and  a portion  of the fees  payable by each  of Class  B and Class  C each year
pursuant to the Plan equal to 0.25% of  the average daily net assets of each  of
Class  A and Class  C and 0.20%  of the average  daily net assets  of Class B is
characterized as  a "service  fee" under  the Rules  of the  Association of  the
National  Association of Securities Dealers, Inc. (of which the Distributor is a
member). The "service  fee" is a  payment made for  personal service and/or  the
maintenance  of shareholder  accounts. The  remaining portion  of the  Plan fees
payable by a Class, if any, is characterized as an "asset-based sales charge" as
such is defined by the aforementioned Rules of the Association.
    
 
                                       16
<PAGE>
    The  Plan was adopted by a majority vote of the Board of Trustees, including
all of the Trustees of the Fund who are not "interested persons" of the Fund (as
defined in the Act) and who have no direct or indirect financial interest in the
operation of the Plan  (the "Independent 12b-1 Trustees"),  cast in person at  a
meeting  called for the purpose of voting on the Plan, on April 16, 1984, by DWR
as the then sole shareholder of the Fund on May 1, 1984, and by the shareholders
holding a majority, as defined in the Act, of the outstanding voting  securities
of the Fund at a Meeting of Shareholders of the Fund held on April 22, 1985.
 
   
    At  their  meeting held  on  October 30,  1992,  the Trustees  of  the Fund,
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  for the  Fund  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 DWR as before the amendment, and that the Distributor in turn is
authorized  to  make  payments  to   DWR,  its  affiliates  or  other   selected
broker-dealers  (or  direct  that  the Fund  pay  such  entities  directly). The
Distributor is also authorized  to retain part of  such fee as compensation  for
its  own distribution-related expenses. At their meeting held on April 28, 1993,
the Trustees, including a majority  of the Independent 12b-1 Trustees,  approved
certain  technical amendments to the Plan  in connection with amendments adopted
by the National  Association of  Securities Dealers, Inc.  to its  Rules of  the
Association.  At their  meeting held  on October 26,  1995, the  Trustees of the
Fund, including all of the Independent 12b-1 Trustees, approved an amendment  to
the  Plan to permit payments  to be made under the  Plan with respect to certain
distribution expenses incurred  in connection with  the distribution of  shares,
including  personal services  to shareholders with  respect to  holdings of such
shares, of an  investment company whose  assets are  acquired by the  Fund in  a
tax-free  reorganization. At their  meeting held on                  , 1997, the
Trustees, including  a  majority of  the  Independent 12b-1  Trustees,  approved
amendments  to the  Plan to reflect  the multiple-class structure  for the Fund,
which took effect on July 28, 1997.
    
 
   
    Under the  Plan and  as required  by Rule  12b-1, the  Trustees receive  and
review promptly after the end of each calendar quarter a written report provided
by the Distributor of the amounts expended by the Distributor under the Plan and
the  purpose for  which such  expenditures were  made. The  Fund accrued amounts
payable to the Distributor under the Plan, during the fiscal year ended December
31, 1996, of $53,189,389. This amount is equal to 0.75% of the average daily net
assets of the Fund for the fiscal year and was calculated pursuant to clause (b)
under the Plan. This amount is treated by the Fund as an expense in the year  it
is  accrued. This amount represents amounts paid  by Class B only; there were no
Class A or Class C shares outstanding on such date.
    
 
   
    The Plan was  adopted in order  to permit the  implementation of the  Fund's
method  of distribution.  Under this  distribution method  the Fund  offers four
Classes of shares, each with a  different distribution arrangement as set  forth
in the Prospectus.
    
 
   
    With  respect to Class  A shares, DWR compensates  its account executives by
paying them, from proceeds  of the front-end sales  charge, commissions for  the
sale  of Class A  shares, currently a  gross sales credit  of up to  4.0% of the
amount sold  (except  as provided  in  the  following sentence)  and  an  annual
residual commission, currently a residual of up to 0.20% of the current value of
the  respective accounts for which they are the account executives or dealers of
record in all cases. On orders of $1 million or more (for which no sales  charge
was   paid)   or  net   asset  value   purchases  by   401(k)  plans   or  other
employer-sponsored plans qualified under Section 401(a) of the Internal  Revenue
Code  for which  Dean Witter  Trust Company  ("DWTC") or  Dean Witter  Trust FSB
("DWTFSB") serves as Trustee or the 401(k) Support Services Group of DWR  serves
as  recordkeeper, the Investment Manager compensates DWR's account executives by
paying them, from  its own funds,  a gross sales  credit of 1.0%  of the  amount
sold.
    
 
                                       17
<PAGE>
   
    With  respect to Class  B shares, DWR compensates  its account executives by
paying them, from its  own funds, commissions  for the sale  of Class B  shares,
currently  a gross  sales credit  of up to  4.0% of  the amount  sold (except as
provided in the following sentence) and an annual residual commission, currently
a residual  of  up to  0.20%  of the  current  value (not  including  reinvested
dividends  or distributions)  of the amount  sold in  all cases. In  the case of
retirement plans qualified under Section 401(k) of the Internal Revenue Code and
other employer-sponsored plans  qualified under Section  401(a) of the  Internal
Revenue  Code for which DWTC  or DWTFSB serves as  Trustee or the 401(k) Support
Services Group of DWR serves as recordkeeper,  and which plans are opened on  or
after July 28, 1997, DWR compensates its account executives by paying them, from
its own funds, a gross sales credit of 3.0% of the amount sold.
    
 
   
    With  respect to Class  C shares, DWR compensates  its account executives by
paying them, from its  own funds, commissions  for the sale  of Class C  shares,
currently  a gross sales credit of  up to 1.0% of the  amount sold and an annual
residual commission, currently a residual of up to 1.0% of the current value  of
the  respective accounts for which they are the account executives or dealers of
record.
    
 
   
    With respect to Class D shares other than shares held by participants in the
InterCapital mutual  fund  asset  allocation  program,  the  Investment  Manager
compensates  DWR's  account  executives  by paying  them,  from  its  own funds,
commissions for the sale of Class D shares, currently a gross sales credit of up
to 1.0% of the amount sold. There is a chargeback of 100% of the amount paid  if
the Class D shares are redeemed in the first year and a chargeback of 50% of the
amount  paid  if  the Class  D  shares are  redeemed  in the  second  year after
purchase. The Investment  Manager also compensates  DWR's account executives  by
paying  them, from  its own  funds, an  annual residual  commission, currently a
residual of up  to 0.10% of  the current  value of the  respective accounts  for
which  they  are the  account executives  of record  (not including  accounts of
participants in the InterCapital mutual fund asset allocation program).
    
 
   
    The gross sales credit is a charge which reflects commissions paid by DWR to
its account executives and DWR's Fund associated distribution-related  expenses,
including   sales   compensation   and   overhead   and   other   branch  office
distribution-related expenses  including: (a)  the expenses  of operating  DWR's
branch  offices  in connection  with the  sale of  Fund shares,  including lease
costs, the  salaries  and employee  benefits  of operations  and  sales  support
personnel,  utility costs, communications costs and  the costs of stationery and
supplies, (b) the costs of client sales seminars, (c) travel expenses of  mutual
fund  sales  coordinators to  promote  the sale  of  Fund shares  and  (d) other
expenses relating to branch promotion of Fund share sales. The distribution  fee
that  the Distributor receives from the Fund  under the Plan, in effect, offsets
distribution expenses incurred under the Plan on behalf of the Fund and, in  the
case of Class B shares, opportunity costs, such as the gross sales credit and an
assumed  interest  charge  thereon  ("carrying  charge").  In  the Distributor's
reporting of the  distribution expenses  to the  Fund, in  the case  of Class  B
shares,  such assumed interest  (computed at the "broker's  call rate") has been
calculated on the gross sales credit as it is reduced by amounts received by the
Distributor under the Plan and any contingent deferred sales charges received by
the Distributor upon redemption of shares of the Fund. No other interest  charge
is  included as a  distribution expense in the  Distributor's calculation of its
distribution costs for this purpose. The broker's call rate is the interest rate
charged to securities brokers on loans secured by exchange-listed securities.
    
 
    The Fund paid 100% of the $53,189,389 accrued under the Plan for the  fiscal
year  ended  December  31, 1996  to  the  Distributor. The  Distributor  and DWR
estimate that they have spent, pursuant to the Plan, $1,150,496,391 on behalf of
the Fund since the inception of the  Plan. It is estimated that this amount  was
spent  in approximately the following  ways: (i) 0.59% ($6,764,961)--advertising
and promotional expenses; (ii) 0.12% ($1,386,515)--printing of prospectuses  for
distribution   to   other   than   current   shareholders;   and   (iii)  99.29%
($1,142,344,915)--other expenses,  including  the  gross sales  credit  and  the
carrying  charge, of  which 14.97%  ($171,001,978) represents  carrying charges,
34.96% ($399,319,081) represents  commission credits to  DWR branch offices  for
payments of commissions to
 
                                       18
<PAGE>
   
account  executives  and  50.07% ($572,023,856)  represents  overhead  and other
branch office  distribution-related expenses.  These amounts  represent  amounts
paid  by Class B  only; there were no  Class A or Class  C shares outstanding on
such date.
    
 
   
    The Fund is authorized to reimburse  expenses incurred or to be incurred  in
promoting  the distribution  of the  Fund's Class  A and  Class C  shares and in
servicing shareholder accounts. Reimbursement will  be made through payments  at
the end of each month. The amount of each monthly payment may in no event exceed
an  amount equal to a payment at the annual  rate of 0.25%, in the case of Class
A, and  0.75%,  in the  case  of Class  C,  of the  average  net assets  of  the
respective  Class during the  month. No interest or  other financing charges, if
any, incurred on any distribution expenses on behalf of Class A and Class C will
be reimbursable under  the Plan. With  respect to Class  A, in the  case of  all
expenses  other than expenses representing the service fee, and, with respect to
Class C, in the case  of all expenses other  than expenses representing a  gross
sales  credit  or  a  residual  to account  executives,  such  amounts  shall be
determined at the beginning of each calendar quarter by the Trustees,  including
a  majority of the Independent 12b-1 Trustees. Expenses representing the service
fee (for Class A) or  a gross sales credit or  a residual to account  executives
(for  Class C) may be reimbursed without  prior determination. In the event that
the Distributor proposes  that monies shall  be reimbursed for  other than  such
expenses,  then in  making quarterly determinations  of the amounts  that may be
reimbursed by  the Fund,  the Distributor  will provide  and the  Trustees  will
review  a quarterly budget of projected  distribution expenses to be incurred on
behalf of  the  Fund,  together  with  a  report  explaining  the  purposes  and
anticipated  benefits of  incurring such  expenses. The  Trustees will determine
which particular expenses, and  the portions thereof, that  may be borne by  the
Fund,  and  in making  such  a determination  shall  consider the  scope  of the
Distributor's commitment to promoting the distribution of the Fund's Class A and
Class C shares.
    
 
   
    At any given time, the  expenses of distributing shares  of the Fund may  be
more or less than the total of (i) the payments made by the Fund pursuant to the
Plan  and  (ii)  the  proceeds  of contingent  deferred  sales  charges  paid by
investors upon redemption of shares. The  Distributor has advised the Fund  that
in the case of Class B shares the excess expenses, including the carrying charge
designed  to approximate the opportunity costs  incurred by DWR which arise from
it having  advanced monies  without  having received  the  amount of  any  sales
charges  imposed at  the time  of sale  of the  Fund's Class  B shares, totalled
$68,120,003 as of December 31, 1996.  Because there is no requirement under  the
Plan  that  the Distributor  be reimbursed  for  all distribution  expenses with
respect to Class B  shares or any  requirement that the  Plan be continued  from
year  to year, this excess  amount does not constitute  a liability of the Fund.
Although there is no legal obligation for  the Fund to pay expenses incurred  in
excess  of payments made to  the Distributor under the  Plan and the proceeds of
contingent deferred sales charges paid  by investors upon redemption of  shares,
if  for any reason  the Plan is  terminated, the Trustees  will consider at that
time the  manner  in which  to  treat  such expenses.  Any  cumulative  expenses
incurred, but not yet recovered through distribution fees or contingent deferred
sales  charges, may or may not be  recovered through future distribution fees or
contingent deferred sales charges.
    
 
    No interested person of the Fund nor any  Trustee of the Fund who is not  an
interested  person of the Fund, as defined  in the Act, has any direct financial
interest in the operation of the Plan except to the extent that the Distributor,
InterCapital, DWSC, DWR, or  certain of their employees,  may be deemed to  have
such  an interest as a result of  benefits derived from the successful operation
of the  Plan or  as a  result of  receiving a  portion of  the amounts  expended
thereunder by the Fund.
 
   
    Under  its terms, the Plan had an  initial term ending December 31, 1984 and
will continue  from  year  to  year thereafter,  provided  such  continuance  is
approved annually by a vote of the Trustees in the manner described above. Prior
to  the Board's approval of amendments to the Plan to reflect the multiple-class
structure for the Fund, the  most recent continuance of  the Plan for one  year,
until  April  30, 1998,  was  approved by  the Board  of  Trustees of  the Fund,
including a majority of the Independent 12b-1 Trustees, at a Board meeting  held
on April 24, 1997. Prior to approving the continuation of the Plan, the Trustees
requested  and received  from the Distributor  and reviewed  all the information
which they deemed necessary  to arrive at an  informed determination. In  making
their  determination  to continue  the Plan,  the  Trustees considered:  (1) the
Fund's   experience    under   the    Plan   and    whether   such    experience
    
 
                                       19
<PAGE>
   
indicates  that the Plan is operating as  anticipated; (2) the benefits the Fund
had obtained, was obtaining and  would be likely to  obtain under the Plan;  and
(3) what services had been provided and were continuing to be provided under the
Plan  to the Fund and its shareholders. Based upon their review, the Trustees of
the Fund,  including each  of the  Independent 12b-1  Trustees, determined  that
continuation  of the Plan  would be in the  best interest of  the Fund and would
have a  reasonable  likelihood  of  continuing  to  benefit  the  Fund  and  its
shareholders.  In the Trustees' quarterly review of the Plan, they will consider
its continued appropriateness and the level of compensation provided herein.
    
 
   
    The Plan may not be  amended to increase materially  the amount to be  spent
for  the services described therein without  approval by the shareholders of the
affected Class or Classes of the Fund,  and all material amendments to the  Plan
must  also 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  Fund (as defined in  the Act) on not  more
than  thirty days' written notice to any other party to the Plan. So long as the
Plan is in  effect, the election  and nomination of  Independent 12b-1  Trustees
shall be committed to the discretion of the Independent 12b-1 Trustees.
    
 
   
DETERMINATION OF NET ASSET VALUE
    
- --------------------------------------------------------------------------------
 
   
    As stated in the Prospectus, short-term securities with remaining maturities
of  sixty days  or less at  the time of  purchase are valued  at amortized cost,
unless the  Trustees determine  such  does not  reflect the  securities'  market
value,  in which  case these securities  will be  valued at their  fair value as
determined by the Trustees. Other short-term debt securities will be valued on a
mark-to-market basis until such time as they reach a remaining maturity of sixty
days, whereupon they will be valued at  amortized cost using their value on  the
61st  day unless  the Trustees determine  such does not  reflect the securities'
market value, in which case these securities will be valued at their fair  value
as  determined by the Trustees. All other securities and other assets are valued
at their fair value as determined in good faith under procedures established  by
and under the supervision of the Trustees.
    
 
   
    The  net asset  value per  share for  each Class  of shares  of the  Fund 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.
    
 
   
PURCHASE OF FUND SHARES
    
- --------------------------------------------------------------------------------
 
   
    As  discussed in the Prospectus,  the Fund offers four  Classes of shares as
follows:
    
 
   
INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES
    
 
   
    Class A  shares are  sold to  investors with  an initial  sales charge  that
declines  to zero for larger purchases; however,  Class A shares sold without an
initial sales charge are subject to a contingent deferred sales charge  ("CDSC")
of  1.0% if redeemed  within one year  of purchase, except  in the circumstances
discussed in the Prospectus.
    
 
   
    RIGHT OF  ACCUMULATION.   As  discussed  in the  Prospectus,  investors  may
combine  the  current value  of shares  purchased  in separate  transactions for
purposes of benefitting from the  reduced sales charges available for  purchases
of  shares  of the  Fund  totalling at  least $25,000  in  net asset  value. For
example, if any person or entity who qualifies for this privilege holds Class  A
or Class D shares of other multiple class funds for which InterCapital serves as
investment  manager ("Dean Witter Multi-Class Funds")  having a current value of
$5,000, and purchases $20,000 of additional shares of the Fund, the sales charge
applicable to the $20,000 purchase would be 4.0% of the offering price.
    
 
                                       20
<PAGE>
   
    The Distributor  must  be notified  by  the selected  broker-dealer  or  the
shareholder  at the time a purchase order  is placed that the purchase qualifies
for the reduced  charge under  the Right of  Accumulation. Similar  notification
must  be made in writing by the  selected broker-dealer or shareholder when such
an order is placed by mail. The reduced sales charge will not be granted if: (a)
such notification is not furnished at the time of the order; or (b) a review  of
the  records  of the  Distributor or  Dean Witter  Trust Company  (the "Transfer
Agent") fails to confirm the investor's represented holdings.
    
 
   
    LETTER OF INTENT.  As discussed in the Prospectus, reduced sales charges are
available to investors who enter into  a written Letter of Intent providing  for
the purchase, within a thirteen-month period, of Class A shares of the Fund from
the Distributor or from a single Selected Broker-Dealer.
    
 
   
    A  Letter of Intent permits an investor to establish a total investment goal
to be achieved  by any number  of purchases over  a thirteen-month period.  Each
purchase of Class A shares made during the period will receive the reduced sales
commission  applicable to the  amount represented by  the goal, as  if it were a
single purchase. A number of shares equal in value to 5% of the dollar amount of
the Letter of Intent will be held in  escrow by the Transfer Agent, in the  name
of  the shareholder. The initial purchase under a Letter of Intent must be equal
to at least 5% of the stated investment goal.
    
 
   
    The Letter of  Intent does not  obligate the investor  to purchase, nor  the
Fund  to sell, the indicated  amount. In the event the  Letter of Intent goal is
not achieved within the thirteen-month period,  the investor is required to  pay
the  difference between the  sales charge otherwise  applicable to the purchases
made during this  period and sales  charges actually paid.  Such payment may  be
made  directly to the Distributor or, if not paid, the Distributor is authorized
by the  shareholder to  liquidate a  sufficient number  of his  or her  escrowed
shares to obtain such difference.
    
 
   
    If  the goal is exceeded and purchases pass the next sales charge level, the
sales charge on the entire amount of  the purchase that results in passing  that
level  and  on subsequent  purchases will  be subject  to further  reduced sales
charges in the same manner as set forth above under "Right of Accumulation," but
there will be no retroactive reduction  of sales charges on previous  purchases.
For  the purpose of  determining whether the  investor is entitled  to a further
reduced sales charge applicable  to purchases at or  above a sales charge  level
which  exceeds the stated goal of a Letter of Intent, the cumulative current net
asset value of any Class A shares owned by the investor in any other Dean Witter
Multi-Class Fund held by the shareholder will be added to the cost or net  asset
value of shares of the Fund owned by the investor.
    
 
   
    At  any time while  a Letter of Intent  is in effect,  a shareholder may, by
written notice to the  Distributor, increase the amount  of the stated goal.  In
that  event, only shares  purchased during the previous  90-day period and still
owned by the shareholder will be included in the new sales charge reduction. The
5% escrow and minimum purchase requirements will be applicable to the new stated
goal. Investors electing to purchase shares of the Fund pursuant to a Letter  of
Intent should carefully read such Letter of Intent.
    
 
   
CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES
    
 
   
    Class B shares are sold without an initial sales charge but are subject to a
CDSC payable upon most redemptions within six years after purchase. As stated in
the Prospectus, a CDSC will be imposed on any redemption by an investor if after
such  redemption the current value of the  investor's Class B shares of the Fund
is less  than the  dollar amount  of all  payments by  the shareholder  for  the
purchase  of Class B shares  during the preceding six years  (or, in the case of
shares held by certain employer-sponsored benefit plans, three years).  However,
no  CDSC will be  imposed to the extent  that the net asset  value of the shares
redeemed does not exceed:  (a) the current net  asset value of shares  purchased
more   than  six   years  (or,   in  the   case  of   shares  held   by  certain
employer-sponsored benefit plans, three years) prior to the redemption, plus (b)
the current  net  asset  value  of  shares  purchased  through  reinvestment  of
dividends  or  distributions  of  the  Fund or  another  Dean  Witter  Fund (see
"Shareholder Services-- Targeted  Dividends"), plus  (c) the  current net  asset
value  of shares acquired  in exchange for  (i) shares of  Dean Witter front-end
sales charge funds, or (ii) shares of  other Dean Witter Funds for which  shares
of
    
 
                                       21
<PAGE>
   
front-end   sales   charge   funds  have   been   exchanged   (see  "Shareholder
Services--Exchange Privilege"), plus (d) increases in the net asset value of the
investor's shares above the  total amount of payments  for the purchase of  Fund
shares  made  during the  preceding  six years.  The CDSC  will  be paid  to the
Distributor.
    
 
   
    In determining the applicability of the CDSC to each redemption, the  amount
which  represents an increase  in the net  asset value of  the investor's shares
above the amount of  the total payments  for the purchase  of shares within  the
last  six years (or,  in the case  of shares held  by certain employer-sponsored
benefit plans, three years) will be redeemed first. In the event the  redemption
amount  exceeds such increase in value, the  next portion of the amount redeemed
will be the amount which represents the net asset value of the investor's shares
purchased more than  six (three)  years prior  to the  redemption and/or  shares
purchased  through  reinvestment  of dividends  or  distributions  and/or shares
acquired in exchange for shares of Dean Witter front-end sales charge funds,  or
for shares of other Dean Witter funds for which shares of front-end sales charge
funds  have been exchanged.  A portion of  the amount redeemed  which exceeds an
amount which represents  both such  increase in value  and the  value of  shares
purchased  more  than six  years  (or, in  the case  of  shares held  by certain
employer-sponsored benefit plans,  three years) prior  to the redemption  and/or
shares  purchased  through  reinvestment of  dividends  or  distributions and/or
shares acquired in the above-described exchanges will be subject to a CDSC.
    
 
   
    The amount of the CDSC, if any,  will vary depending on the number of  years
from  the time of payment for  the purchase of Class B  shares of the Fund until
the time of redemption of such shares. For purposes of determining the number of
years from the time of any payment for the purchase of shares, all payments made
during a month will be aggregated and deemed  to have been made on the last  day
of the month. The following table sets forth the rates of the CDSC applicable to
most Class B shares of the Fund:
    
 
   
<TABLE>
<CAPTION>
                                                                                            CDSC AS A
                                        YEAR SINCE                                          PERCENTAGE
                                         PURCHASE                                           OF AMOUNT
                                       PAYMENT MADE                                         REDEEMED
- ------------------------------------------------------------------------------------------  ---------
<S>                                                                                         <C>
First.....................................................................................       5.0%
Second....................................................................................       4.0%
Third.....................................................................................       3.0%
Fourth....................................................................................       2.0%
Fifth.....................................................................................       2.0%
Sixth.....................................................................................       1.0%
Seventh and thereafter....................................................................    None
</TABLE>
    
 
   
    The  following table sets forth the rates  of the CDSC applicable to Class B
shares of  the Fund  held  by 401(k)  plans  or other  employer-sponsored  plans
qualified  under Section 401(a) of  the Internal Revenue Code  for which DWTC or
DWTFSB serves as Trustee or the 401(k)  Support Services Group of DWR serves  as
recordkeeper and whose accounts are opened on or after July 28, 1997:
    
 
   
<TABLE>
<CAPTION>
                                                                                            CDSC AS A
                                        YEAR SINCE                                          PERCENTAGE
                                         PURCHASE                                           OF AMOUNT
                                       PAYMENT MADE                                         REDEEMED
- ------------------------------------------------------------------------------------------  ---------
<S>                                                                                         <C>
First.....................................................................................       2.0%
Second....................................................................................       2.0%
Third.....................................................................................       1.0%
Fourth and thereafter.....................................................................    None
</TABLE>
    
 
   
    In determining the rate of the CDSC, it will be assumed that a redemption is
made  of shares held by  the investor for the longest  period of time within the
applicable six-year or  three-year period.  This will  result in  any such  CDSC
being  imposed  at  the lowest  possible  rate.  The CDSC  will  be  imposed, in
accordance with the table shown above, on any redemptions within six years  (or,
in  the case of  shares held by certain  employer-sponsored benefit plans, three
years) of purchase which are in excess of these amounts and which redemptions do
not qualify for waiver of the CDSC, as described in the Prospectus.
    
 
                                       22
<PAGE>
   
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
    
 
   
    Class C shares are sold without a sales charge but are subject to a CDSC  of
1.0%  on most  redemptions made  within one year  after purchase,  except in the
circumstances discussed in the Prospectus.
    
 
   
NO LOAD ALTERNATIVE--CLASS D SHARES
    
 
   
    Class D  shares  are  offered  without  any  sales  charge  on  purchase  or
redemption.  Class  D  shares are  offered  only  to those  persons  meeting the
qualifications set forth in the Prospectus.
    
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
   
    Upon the purchase of shares of the Fund, a Shareholder Investment Account is
opened for the investor on the books of the Fund and maintained by 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. If  a
share  certificate  is  desired,  it  must  be  requested  in  writing  for each
transaction. Certificates are issued only for full shares and may be redeposited
in the account at any time. There is no charge to the investor for issuance of a
certificate. Whenever a  shareholder-instituted transaction takes  place in  the
Shareholder Investment Account, the shareholder will be mailed a confirmation of
the transaction from the Fund or from DWR or other selected broker-dealer.
    
 
   
    AUTOMATIC  INVESTMENT  OF DIVIDENDS  AND DISTRIBUTIONS.    As stated  in the
Prospectus,  all   income  dividends   and  capital   gains  distributions   are
automatically  paid in full and fractional shares of the applicable Class of the
Fund, unless the shareholder requests that  they be paid in cash. Each  purchase
of  shares of  the Fund is  made upon the  condition that the  Transfer Agent is
thereby automatically  appointed  as  agent  of  the  investor  to  receive  all
dividends  and capital gains distributions on shares owned by the investor. Such
dividends and distributions will be paid, at  the net asset value per share,  in
shares  of the Fund (or in cash if  the shareholder so requests) as of the close
of business on the  monthly payment date,  as stated in  the Prospectus. At  any
time  an investor may request the Transfer Agent, in writing, to have subsequent
dividends and/or capital gains distributions paid  to him or her in cash  rather
than  shares. To assure sufficient  time to process the  change, such request be
received by the Transfer Agent at least five business days prior to the  payment
date  of the  dividend or the  record date of  the distribution. In  the case of
recently purchased  shares for  which registration  instructions have  not  been
received  on the payment  or record date, cash  payments will be  made to DWR or
other selected broker-dealer, and will be forwarded to the shareholder, upon the
receipt of proper instructions.
    
 
   
    TARGETED  DIVIDENDS.-SM-    In  states  where  it  is  legally  permissible,
shareholders  may also have all income dividends and capital gains distributions
automatically invested in shares  of any Class of  an open-end Dean Witter  Fund
other  than Dean Witter U.S. Government Securities  Trust or in another Class of
Dean Witter U.S. Government  Securities Trust. Such investment  will be made  as
described  above for automatic  investment in shares of  the applicable Class of
the Fund, at the net asset value per  share of the selected Dean Witter Fund  as
of the close of business on the payment date of the dividend or distribution and
will  begin to earn dividends, if any, in the selected Dean Witter Fund the next
business day. To  participate in  the Targeted  Dividends program,  shareholders
should  contact their DWR  or other selected  broker-dealer account executive or
the Transfer  Agent.  Shareholders of  the  Fund  must be  shareholders  of  the
selected  Class of  the Dean  Witter Fund  targeted to  receive investments from
dividends at  the time  they  enter the  Targeted Dividends  program.  Investors
should  review the prospectus  of the targeted Dean  Witter Fund before entering
the program.
    
 
   
    EASYINVEST.-SM-   Shareholders may  subscribe  to EasyInvest,  an  automatic
purchase  plan  which  provides  for  any  amount  from  $100  to  $5,000  to be
transferred automatically  from  a  checking or  savings  account  or  following
redemption  of shares  of a  Dean Witter money  market fund,  on a semi-monthly,
monthly or quarterly basis,  to the Transfer Agent  for investment in shares  of
the Fund. Shares purchased through EasyInvest will be added to the shareholder's
existing account at the net asset value calculated
    
 
                                       23
<PAGE>
the same business day the transfer of funds is effected. For further information
or  to subscribe to  EasyInvest, shareholders should contact  their DWR or other
selected broker-dealer account executive or the Transfer Agent.
 
   
    INVESTMENT OF DIVIDENDS OR DISTRIBUTIONS RECEIVED IN CASH.  As discussed  in
the  Prospectus,  any shareholder  who receives  a  cash payment  representing a
dividend or capital gains distribution may invest such dividend or  distribution
at  net  asset value,  without  the imposition  of  a CDSC  upon  redemption, by
returning the check  or the proceeds  to the Transfer  Agent within thirty  days
after the payment date. If the shareholder returns the proceeds of a dividend or
distribution,  such funds must  be accompanied by  a signed statement indicating
that the proceeds  constitute a dividend  or distribution to  be invested.  Such
investment  will be made at the net  asset value per share next determined after
receipt of the check or proceeds by the Transfer Agent.
    
 
   
    SYSTEMATIC WITHDRAWAL PLAN.   As discussed in  the Prospectus, a  systematic
withdrawal plan (the "Withdrawal Plan") is available for shareholders who own or
purchase  shares of the  Fund having a  minimum value of  $10,000 based upon the
then current  net asset  value.  The Withdrawal  Plan  provides for  monthly  or
quarterly (March, June, September and December) checks in any dollar amount, not
less  then  $25,  or in  any  whole percentage  of  the account  balance,  on an
annualized basis. Any applicable CDSC will  be imposed on shares redeemed  under
the  Withdrawal  Plan  (see  "Purchase  of  Fund  Shares"  in  the  Prospectus).
Therefore, any  shareholder  participating  in the  Withdrawal  Plan  will  have
sufficient  shares redeemed from his or her account so that the proceeds (net of
any applicable  CDSC) to  the  shareholder will  be  the designated  monthly  or
quarterly amount.
    
 
    The  Transfer Agent acts  as agent for  the shareholder in  tendering to the
Fund 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 following 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 business  days after the
date of redemption. The  Withdrawal Plan may  be terminated at  any time by  the
Fund.
 
    Withdrawal  Plan payments should  not be considered  as dividends, yields or
income. If periodic withdrawal plan payments continuously exceed net  investment
income  and net  capital gains,  the shareholder's  original investment  will be
correspondingly reduced and ultimately exhausted.
 
   
    Each withdrawal constitutes  a redemption  of shares  and any  gain or  loss
realized  must  be  recognized for  federal  income tax  purposes.  Although the
shareholder may  make  additional  investments  of  $2,500  or  more  under  the
Withdrawal  Plan, withdrawals made currently with purchases of additional shares
may be inadvisable because  of the CDSC applicable  to the redemption of  shares
previously purchased (see "Purchase of Fund Shares").
    
 
    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  "Redemptions  and
Repurchases" in the Prospectus) at any time.
 
                                       24
<PAGE>
   
    DIRECT INVESTMENTS THROUGH TRANSFER AGENT.  As discussed in the  Prospectus,
a shareholder may make additional investments in Fund shares at any time through
the  Shareholder Investment Account by  sending a check in  any amount, not less
than $100, payable to Dean Witter U.S. Government Securities Trust, directly  to
the Fund's Transfer Agent. In the case of Class A shares, after deduction of any
applicable  sales charge, the  balance will be  applied to the  purchase of Fund
shares, and, in the case of shares of the other Classes, the entire amount  will
be applied to the purchase of Fund shares, at the net asset value per share next
computed  after receipt of the check or  purchase payment by the Transfer Agent.
The shares so purchased will be credited to the investor's account.
    
 
EXCHANGE PRIVILEGE
 
   
    As discussed in the Prospectus, the Fund makes available to its shareholders
an Exchange Privilege whereby shareholders of  each Class of shares of the  Fund
may  exchange their shares for  shares of the same Class  of shares of any other
Dean Witter Multi-Class Fund without the imposition of any exchange fee.  Shares
may  also be exchanged for shares of the following Funds: Dean Witter Short-Term
U.S. Treasury  Trust, Dean  Witter  Limited Term  Municipal Trust,  Dean  Witter
Short-Term Bond Fund, Dean Witter Intermediate Term U.S. Treasury Trust and five
Dean  Witter Funds which  are money market  funds (the foregoing  nine funds are
hereinafter referred to  as the "Exchange  Funds"). Class A  shares may also  be
exchanged  for shares of Dean Witter Multi-State Municipal Series Trust and Dean
Witter Hawaii Municipal Trust, which are Dean Witter Funds sold with a front-end
sales charge ("FSC Funds"). Class B shares  may also be exchanged for shares  of
Dean  Witter  Global  Short-Term  Income  Fund  Inc.,  Dean  Witter  High Income
Securities and Dean Witter National Municipal Trust, which are Dean Witter Funds
offered with a CDSC ("CDSC  Funds"). Exchanges may be  made after the shares  of
the  Fund acquired by  purchase (not by exchange  or dividend reinvestment) have
been held for thirty days.  There is no waiting  period for exchanges of  shares
acquired  by exchange or dividend reinvestment.  An exchange will be treated for
federal income tax purposes the same as a repurchase or redemption of shares, on
which the shareholder may realize a capital gain or loss.
    
 
    Any new account  established through  the Exchange Privilege  will have  the
same registration and cash dividend or dividend reinvestment plan as the present
account,  unless  the  Transfer  Agent  receives  written  notification  to  the
contrary. For  telephone  exchanges,  the exact  registration  of  the  existing
account and the account number must be provided.
 
    Any  shares  held  in  certificate  form cannot  be  exchanged  but  must be
forwarded to the  Transfer Agent  and deposited into  the shareholder's  account
before  being eligible for exchange. (Certificates  mailed in for deposit should
not be endorsed.)
 
   
    As described below,  and in the  Prospectus under the  caption "Purchase  of
Fund  Shares," a CDSC may be imposed upon a redemption, depending on a number of
factors, including the number of years from the time of purchase until the  time
of  redemption or exchange  ("holding period"). When  shares of the  Fund or any
CDSC Fund are exchanged for shares of an Exchange Fund, the exchange is executed
at no charge to the shareholder, without the imposition of the CDSC at the  time
of  the  exchange. During  the period  of  time the  shareholder remains  in the
Exchange Fund (calculated from the last day  of the month in which the  Exchange
Fund  shares were acquired), the holding  period or "year since purchase payment
made" is frozen. When shares are redeemed out of the Exchange Fund, they will be
subject to a CDSC which would be  based upon the period of time the  shareholder
held shares in the Fund or in a CDSC Fund. However, in the case of shares of the
Fund  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  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
the  Exchange Fund resumes on the  last day of the month  in which shares of the
Fund or of a CDSC Fund are reacquired.  A CDSC is imposed only upon an  ultimate
redemption, based upon the time (calculated as described
    
 
                                       25
<PAGE>
   
above)  the shareholder was invested in the Fund  or in a CDSC Fund. In the case
of exchanges of Class A shares which  are subject to a CDSC, the holding  period
also  includes  the time  (calculated as  described  above) the  shareholder was
invested in a FSC Fund.
    
 
   
    When shares initially purchased in the Fund or in a CDSC Fund are  exchanged
for shares of any Dean Witter Multi-Class Fund, shares of a CDSC Fund, shares of
a  FSC Fund or shares of an Exchange Fund, the date of purchase of the shares of
the fund exchanged into, for purposes of  the CDSC upon redemption, will be  the
last  day  of the  month in  which  the shares  being exchanged  were originally
purchased. In allocating the purchase payments between funds for purposes of the
CDSC, the amount which represents the current  net asset value of shares at  the
time  of the exchange which were (i) purchased more than one, three or six years
(depending on the CDSC schedule applicable to the shares) prior to the exchange,
(ii) originally acquired through reinvestment of dividends or distributions  and
(iii)  acquired in exchange for shares of FSC Funds, or for shares of other Dean
Witter Funds for which shares of FSC Funds have been exchanged (all such  shares
called "Free Shares"), will be exchanged first. After an exchange, all dividends
earned  on shares  in an Exchange  Fund 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,  with respect  to Class  B shares,  if shares  held for  identical
periods  of time but  subject to different  CDSC schedules are  held in the same
Exchange Privilege account, the shares of that block that are subject to a lower
CDSC rate will be exchanged prior to  the shares of that block that are  subject
to  a  higher CDSC  rate).  Shares equal  to any  appreciation  in the  value of
non-Free Shares exchanged will be treated as Free Shares, and the amount of  the
purchase  payments for the  non-Free Shares of  the fund exchanged  into will be
equal to the lesser  of (a) the  purchase payments for, or  (b) the current  net
asset  value of,  the exchanged  non-Free Shares.  If an  exchange between funds
would result in exchange of only part of a particular block of non-Free  Shares,
then  shares equal  to any  appreciation in the  value of  the block  (up to the
amount of the exchange) will be treated as Free Shares and exchanged first,  and
the  purchase  payment for  that block  will be  allocated on  a pro  rata basis
between the non-Free Shares of that block to be retained and the non-Free Shares
to be exchanged. The  prorated amount of such  purchase payment attributable  to
the  retained  non-Free Shares  will  remain as  the  purchase payment  for such
shares, and the  amount of purchase  payment for the  exchanged non-Free  Shares
will  be equal to the lesser of (a)  the prorated amount of the purchase payment
for, or (b)  the current net  asset value of,  those exchanged non-Free  Shares.
Based  upon  the  procedures  described  in  the  Prospectus  under  the caption
"Purchase of Fund Shares," 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 Fund, the
application of proceeds to the purchase of  new shares in the Fund 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. 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 Fund shall not be
liable for any default or negligence  of the Transfer Agent, the Distributor  or
any selected broker-dealer.
 
    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 Fund shares to the purchase of 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.
 
   
    Exchanges are subject to  the minimum investment  requirement and any  other
conditions  imposed  by  each  fund. (The  minimum  initial  investment  for the
Exchange Privilege account of each Class is $5,000 for 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, al-
though  those funds may,  at their discretion, accept  initial investments of as
low as $1,000. The minimum initial investment for the Exchange Privilege account
of each Class is $10,000 for Dean Witter Short-Term
    
 
                                       26
<PAGE>
   
U.S. Treasury  Trust, although  that fund  may, at  its discretion,  may  accept
initial  purchases of as low  as $5,000. The minimum  initial investment for the
Exchange Privilege account of each Class is $5,000 for Dean Witter Special Value
Fund. The minimum initial investment for the Exchange Privilege account of  each
Class  of  all other  Dean  Witter Funds  for  which the  Exchange  Privilege is
available is $1,000.) Upon  exchange into an Exchange  Fund, the shares of  that
fund  will  be held  in  a special  Exchange  Privilege Account  separately from
accounts of those shareholders who have acquired their shares directly from that
fund. As a result, certain services normally available to shareholders of  those
funds, including the check writing feature, will not be available for funds held
in that account.
    
 
    The  Fund 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  the Fund and/or any of  the Dean Witter Funds for  which
shares  of the Fund have been 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  an
Exchange  Fund pursuant to the Exchange Privilege, and provided further that the
Exchange Privilege may  be terminated  or materially revised  without notice  at
times  (a) when the New  York Stock Exchange is  closed for other than customary
weekends and holidays, (b) when trading on that 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 Fund 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  Fund would  be unable  to invest  amounts effectively  in
accordance with its investment objective, policies and restrictions.
 
    Shareholders  should  contact  their  DWR  or  other  selected broker-dealer
account executive  or  the Transfer  Agent  for further  information  about  the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
   
    REDEMPTION.   As stated in the Prospectus,  shares of each Class of the Fund
can be redeemed  for cash  at any time  at the  net asset value  per share  next
determined;  however, such redemption  proceeds may be reduced  by the amount of
any applicable CDSC.  If shares are  held in a  shareholder's account without  a
share certificate, a written request for redemption to the Fund's Transfer Agent
at  P.O. Box 983, Jersey City, NJ 07303 is required. if certificates are held by
the shareholder, the  shares may  be redeemed by  surrendering the  certificates
with a written request for redemption. The share certificate, or an accompanying
stock  power, and the request for redemption,  must be signed by the shareholder
or  shareholders  exactly  as  the  shares  are  registered.  Each  request  for
redemption,  whether or not accompanied by a  share certificate, must be sent to
the Fund's Transfer Agent, which will redeem the shares at their net asset value
next computed  (see  "Purchase of  Fund  Shares"  in the  Prospectus)  after  it
receives  the request,  and certificate, if  any, in good  order. Any redemption
request received after such computation will be redeemed at the next  determined
net asset value. The term "good order" means that the share certificate, if any,
and request for redemption are properly signed, accompanied by any documentation
required  by the Transfer Agent, and  bear signature guarantees when required by
the Fund or  the Transfer Agent.  If redemption is  requested by a  corporation,
partnership,  trust or  fiduciary, the Transfer  Agent may  require that written
evidence of authority acceptable to the Transfer Agent be submitted before  such
request is accepted.
    
 
    Whether  certificates are held  by the shareholder  or shares are  held in a
shareholder's account, if the proceeds are to  be paid to any person other  than
the record owner, or if the proceeds are to be paid to a corporation (other than
the Distributor or a selected broker-dealer for the account of the shareholder),
partnership,  trust or fiduciary, or sent to the shareholder at an address other
than the  registered  address, 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
 
                                       27
<PAGE>
eligible guarantor). A stock power may be obtained from any dealer or commercial
bank. The Fund may change the signature guarantee requirements from time to time
upon  notice  to shareholders,  which may  be by  means of  a supplement  to the
prospectus or a new prospectus.
 
   
    REPURCHASE.    As  stated  in   the  Prospectus,  DWR  and  other   selected
broker-dealers  are  authorized  to  repurchase shares  represented  by  a share
certificate which  is  delivered to  any  of their  offices.  Shares held  in  a
shareholder's account without a share certificate may also be repurchased by DWR
and   other  selected  broker-dealers   upon  the  telephonic   request  of  the
shareholder. The repurchase  price is the  net asset value  next computed  after
such  purchase order is received by  DWR or other selected broker-dealer reduced
by any applicable CDSC.
    
 
   
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  As discussed in the Prospectus,
payment for shares of any Class  presented for repurchase or redemption will  be
made  by check  within seven  days after  receipt by  the Transfer  Agent of the
certificate and/or written request  in good order. The  term "good order"  means
that  the share  certificate, if  any, and  request for  redemption are properly
signed, accompanied by  any documentation  required by the  Transfer Agent,  and
bear  signature guarantees when required by the Fund or the Transfer Agent. Such
payment may be postponed or the right of redemption suspended at times (a)  when
the  New York  Stock Exchange  is closed for  other than  customary weekends and
holidays, (b) when trading on that 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 Fund
fairly to determine the value of its net assets, or (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. If  the
shares  to  be  redeemed have  recently  been  purchased by  check  (including a
certified or  bank  cashier's check),  payment  of redemption  proceeds  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 receipt of the
check by the Transfer Agent). Shareholders maintaining margin accounts with  DWR
or  another  selected  broker-dealer  are referred  to  their  account executive
regarding restrictions on redemption of shares of the Fund pledged in the margin
accounts.
    
 
   
    TRANSFERS OF SHARES.  In the event a shareholder requests a transfer of  any
shares  to a  new registration,  such shares  will be  transferred without sales
charge at the time of  transfer. With regard to the  status of shares which  are
either subject to the CDSC or free of such charge (and with regard to the length
of  time shares subject  to the charge  have been held),  any transfer involving
less than all of the shares in an account will be made on a pro-rata basis (that
is, by transferring shares  in the same proportion  that the transferred  shares
bear  to the total shares in the account immediately prior to the transfer). The
transferred shares will continue to be subject to any applicable CDSC as if they
had not been so transferred.
    
 
   
    REINSTATEMENT PRIVILEGE.  As discussed in the Prospectus, a shareholder  who
has  had  his or  her  shares redeemed  or  repurchased and  has  not previously
exercised this reinstatement  privilege may, within  35 days after  the date  of
redemption  or repurchase, reinstate any portion or  all of the proceeds of such
redemption or repurchase  in shares of  the Fund in  the same Class  at the  net
asset  value next  determined after a  reinstatement request,  together with the
proceeds, is received by the Transfer Agent.
    
 
    Exercise of the reinstatement privilege  will not affect the federal  income
tax  treatment of any gain  or loss realized upon  the redemption or repurchase,
except that if the redemption or repurchase resulted in a loss and reinstatement
is made in shares of the Fund, some or all of the loss, depending on the  amount
reinstated,  will not be allowed as a  deduction for federal income tax purposes
but will  be applied  to  adjust the  cost basis  of  the shares  acquired  upon
reinstatement.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, the Fund will determine either to distribute
or  to retain all  or part of  any net long-term  capital gains in  any year for
reinvestment.   If   any    such   gains   are    retained,   the   Fund    will
 
                                       28
<PAGE>
pay  federal income tax thereon and  will notify shareholders that, following an
election by  the  Fund,  the  shareholders will  be  required  to  include  such
undistributed  gains in  determining their  taxable income  and may  claim their
share of the tax paid by the  Fund as a credit against their individual  federal
income tax.
 
    Because  the Fund intends to distribute all of its net investment income and
capital gains to shareholders and otherwise  continue to qualify as a  regulated
investment  company under Subchapter M  of the Internal Revenue  Code, it is not
expected that  the  Fund  will  be  required to  pay  any  federal  income  tax.
Shareholders  will normally have to pay federal income taxes, and any applicable
state and/or local income taxes, on the dividends and distributions they receive
from the Fund.  Such dividends and  distributions, to the  extent that they  are
derived  from net investment income or  short-term capital gains, are taxable to
the shareholder  as  ordinary  income  regardless  of  whether  the  shareholder
receives  such payments in additional shares  or in cash. 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
year.
 
    Gains or losses on sales of securities by the Fund will be long-term capital
gains or losses  if the  securities have  been held by  the Fund  for more  than
twelve  months. Gains or losses on the sale of securities held for twelve months
or less will be short-term gains or losses.
 
    Distributions of  net  long-term  capital  gains, if  any,  are  taxable  to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional  shares or in cash. Capital  gains distributions are not eligible for
the dividends received deduction.
 
    Net  income,   for  dividend   purposes,  includes   accrued  interest   and
amortization  of original issue discount  and market discounts where applicable,
less the expenses of the Fund.  Net income will be calculated immediately  prior
to the determination of net asset value per share of the Fund.
 
    Under  current federal law,  the Fund will receive  net investment income in
the form of interest by virtue of  holding Treasury bills, notes and bonds,  and
will  recognize  income attributable  to it  from  holding zero  coupon Treasury
securities. Current federal tax law requires that a holder (such as the Fund) of
a zero coupon security accrue  a portion of the  discount at which the  security
was  purchased as  income each  year even though  the Fund  receives no interest
payment in cash on the security during  the year. As an investment company,  the
Fund  must pay  out substantially  all of its  net investment  income each year.
Accordingly, the  Fund,  to  the  extent it  invests  in  zero  coupon  Treasury
securities,  may be required to  pay out as an  income distribution each year an
amount which is greater than the total  amount of cash receipts of interest  the
Fund  actually received. Such distributions will be made from the available cash
of the  Fund  or by  liquidation  of portfolio  securities  if necessary.  If  a
distribution  of cash necessitates the  liquidation of portfolio securities, the
Investment Manager will select which securities to sell. The Fund may realize  a
gain  or loss from such sales. In the  event the Fund realizes net capital gains
from such  transactions, its  shareholders  may receive  a larger  capital  gain
distribution, if any, than they would in the absence of such transactions.
 
    Any dividend or capital gains distribution received by a shareholder from an
investment  company will have the effect of  reducing the net asset value of the
shareholder's stock  in that  company by  the exact  amount of  the dividend  or
capital   gains  distribution.  Furthermore,  capital  gains  distributions  and
dividends are subject to  federal income taxes.  If the net  asset value of  the
shares  should be reduced below a shareholder's  cost as a result of the payment
of dividends  or the  distribution  of realized  long-term capital  gains,  such
payment  or  distribution  would  be  in  part  a  return  of  the shareholder's
investment to the  extent of such  reduction below the  shareholder's cost,  but
nonetheless  would be  fully taxable at  either ordinary or  capital gain rates.
Therefore, an investor should consider  the tax implications of purchasing  Fund
shares immediately prior to a distribution record date.
 
    Shareholders  are urged to consult their attorneys or tax advisers regarding
specific questions as to federal, state or local taxes.
 
                                       29
<PAGE>
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
   
    As discussed in the  Prospectus, from time  to time the  Fund may quote  its
"yield"  and/or its "total return" in advertisements and sales literature. These
figures are  computed separately  for Class  A, Class  B, Class  C and  Class  D
shares.  Yield is  calculated for  any 30-day period  as follows:  the amount of
interest income  for each  security in  the Fund's  portfolio is  determined  in
accordance  with regulatory  requirements; the  total for  the entire portfolio,
adjusted by the  gain or  loss on paydowns  during the  period, constitutes  the
Fund's  gross  income for  the period.  Expenses accrued  during the  period are
subtracted to arrive  at "net investment  income" of each  Class. The  resulting
amount  is divided by the product  of the net asset value  per share on the last
day of the period multiplied by the  average number of shares of the  applicable
Class outstanding during the period that were entitled to dividends. This amount
is  added to  1 and raised  to the  sixth power. 1  is then  subtracted from the
result and the difference is multiplied by 2 to arrive at the annualized  yield.
For  the 30-day  period ended  December 31,  1996, the  Fund's yield, calculated
pursuant to the formula described  above, was 6.11%. This  yield is for Class  B
only; there were no other Classes of shares outstanding on such date.
    
 
   
    The  Fund's "average annual total return" represents an annualization of the
Fund's total return  over a  particular period and  is computed  by finding  the
annual  percentage rate which  will result in  the ending redeemable  value of a
hypothetical $1,000 investment made at the beginning of a one, five or ten  year
period,  or  for  the  period  from  the  date  of  commencement  of  the Fund's
operations, if shorter than any of the foregoing. The ending redeemable value is
reduced by any CDSC at the end of the one, five or ten year or other period. For
the  purpose  of  this  calculation,  it  is  assumed  that  all  dividends  and
distributions are reinvested. The formula for computing the average annual total
return involves a percentage obtained by dividing the ending redeemable value by
the  amount of the initial investment, taking  a root of the quotient (where the
root is equivalent to the number of years in the period) and subtracting 1  from
the  result. The  average annual total  returns of  the Fund for  the year ended
December 31, 1996, for the  five years ended December 31,  1996 and for the  ten
years  ended December 31, 1996 were -1.69%, 5.35% and 6.97%, respectively. These
returns are for Class B only; there were no other Classes of shares  outstanding
on such date.
    
 
   
    In  addition to the foregoing,  the Fund may advertise  its total return for
each Class  over different  periods  of time  by  means of  aggregate,  average,
year-by-year  or other types  of total return figures.  Such calculations may or
may not reflect the deduction of the CDSC which, if reflected, would reduce  the
performance quoted. For example, the average annual total return of the Fund may
be  calculated  in the  manner  described above  but  without deduction  for any
applicable CDSC. Based on this calculation, the average annual total returns  of
the Fund for the year ended December 31, 1996, for the five years ended December
31,  1996 and for  the ten years ended  December 31, 1996  were 3.16%, 5.65% and
6.97%, respectively. These  returns are for  Class B only;  there were no  other
Classes of shares outstanding on such date.
    
 
   
    In  addition, the Fund may compute its aggregate total return for each Class
for specified periods by  determining the aggregate  percentage rate which  will
result  in the  ending value  of a  hypothetical $1,000  investment made  at the
beginning of the period. For the purpose of this calculation, it is assumed that
all dividends  and  distributions  are reinvested.  The  formula  for  computing
aggregate  total return  involves a percentage  obtained by  dividing the ending
value (without the reduction for any CDSC) by the initial $1,000 investment  and
subtracting  1 from the  result. Based on the  foregoing calculation, the Fund's
total return for the year  ended December 31, 1996  was 3.16%, the total  return
for  the five years ended December 31, 1996 was 31.65%, and the total return for
the ten years ended December 31, 1996 was 96.14%. These returns are for Class  B
only; there were no other Classes of shares outstanding on such date.
    
 
   
    The  Fund  may  also advertise  the  growth of  hypothetical  investments of
$10,000, $50,000 and $100,000 in each Class of shares of the Fund by adding 1 to
the Fund's aggregate total  return to date (expressed  as a decimal and  without
taking  into  account the  effect  of any  applicable  CDSC) and  multiplying by
$10,000, $50,000 or $100,000.  Investments of $10,000,  $50,000 and $100,000  in
the Fund
    
 
                                       30
<PAGE>
   
at inception (June 29, 1984) would have grown to $26,827, $134,135 and $268,270,
respectively,  at December 31, 1996. This information is for Class B only; there
were no other Classes of shares outstanding on such date.
    
 
   
    The Fund from time  to time may also  advertise its performance relative  to
certain performance rankings and indexes compiled by independent organizations.
    
 
   
DESCRIPTION OF SHARES OF THE FUND
    
- --------------------------------------------------------------------------------
 
   
    The shareholders of the Fund are entitled to a full vote for each full share
held.  All of the  Trustees have been  elected by the  shareholders of the Fund,
most recently at a Special Meeting of Shareholders held on May 21, 1997. On that
date, Wayne E. Hedien was also elected as  a Trustee of the Fund, with his  term
to  commence on September 1, 1997. The  Fund is authorized to issue an unlimited
number of shares of beneficial interest. 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 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  Fund. 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 50 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 authorized any such
additional series  or  classes  of  shares  other  than  as  set  forth  in  the
Prospectus.
    
 
    The Declaration of Trust further provides that no Trustee, officer, employee
or  agent of  the Fund is  liable to the  Fund or  to a shareholder,  nor is any
Trustee, officer, employee or  agent liable to any  third persons in  connection
with the affairs of the Fund, except as such liability may arise from his/her or
its  own bad faith, willful misfeasance, gross negligence, or reckless disregard
of his duties. It also provides that all third persons shall look solely to  the
Fund  property for satisfaction of claims arising in connection with the affairs
of the Fund. 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 Fund.
 
   
    The Fund is authorized to issue an unlimited number of shares of  beneficial
interest.  The Fund 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 Fund's  assets.  Any of  the  Fund'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 Fund's shares and  Dividend
Disbursing  Agent for payment of dividends  and distributions on Fund shares and
Agent for shareholders  under various  investment plans  described herein.  Dean
Witter  Trust  Company is  an affiliate  of Dean  Witter InterCapital  Inc., the
Fund's Investment  Manager, and  of Dean  Witter Distributors  Inc., the  Fund's
Distributor. As Transfer Agent and Dividend
 
                                       31
<PAGE>
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 Fund.
 
INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
    Price  Waterhouse LLP serves as the independent accountants of the Fund. The
independent accountants  are  responsible  for  auditing  the  annual  financial
statements of the Fund.
 
REPORTS TO SHAREHOLDERS
- --------------------------------------------------------------------------------
 
    The  Fund will send to shareholders, at least semi-annually, reports showing
the Fund's  portfolio  and  other  information.  An  annual  report,  containing
financial  statements  audited  by  independent  accountants,  will  be  sent to
shareholders each year.
 
    The Fund's fiscal year ends on December 31. The financial statements of  the
Fund  must be  audited at  least once  a year  by independent  accountants whose
selection is made annually by the Fund's Board of Trustees.
 
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
    Barry Fink, Esq., who  is an officer and  General Counsel of the  Investment
Manager, is an officer and General Counsel of the Fund.
 
EXPERTS
- --------------------------------------------------------------------------------
 
   
    The  annual financial statements of the Fund for the year ended December 31,
1996, which  are  included  in  this Statement  of  Additional  Information  and
incorporated  by  reference  in  the  Prospectus,  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 Fund 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.
 
                                       32
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF DEAN WITTER U.S. GOVERNMENT SECURITIES 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 present fairly, in all
material respects, the financial position of Dean Witter U.S. Government
Securities Trust (the "Fund") at December 31, 1996, 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
Fund'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 December 31, 1996 by correspondence with the
custodian and a broker, provide a reasonable basis for the opinion expressed
above.
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
FEBRUARY 18, 1997
 
                                       33
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
  PRINCIPAL                               DESCRIPTION
  AMOUNT IN                                   AND                                   COUPON
  THOUSANDS                              MATURITY DATE                               RATE          VALUE
- -------------------------------------------------------------------------------------------------------------
<C>            <S>                                                                 <C>        <C>
               MORTGAGE-BACKED SECURITIES (80.5%)
               Government National Mortgage Assoc. I (79.6%)
$     348,269  10/15/22-02/15/24.................................................        6.50% $   332,053,085
       25,000  (a)...............................................................        7.00      24,437,500
    2,194,356  04/15/17-04/15/26.................................................        7.00   2,144,983,431
    1,098,215  11/15/02-06/15/26.................................................        7.50   1,098,557,782
      372,670  10/15/16-07/15/26.................................................        8.00     380,240,075
      390,028  07/15/06-04/15/25.................................................        8.50     404,044,832
      283,195  10/15/08-08/15/21.................................................        9.00     298,239,454
      199,610  10/15/09-12/15/20.................................................        9.50     215,641,679
      214,924  11/15/09-11/15/20.................................................       10.00     235,543,142
          588  04/15/10-06/15/15.................................................       12.50         676,881
                                                                                              ---------------
                                                                                                5,134,417,861
                                                                                              ---------------
 
               Government National Mortgage Assoc. II (0.7%)
       49,127  01/20/24-02/20/24.................................................        6.50      46,624,166
                                                                                              ---------------
 
               Government National Mortgage Assoc. GPM I (0.2%)
        9,269  06/15/13-09/15/15.................................................       12.25      10,794,963
                                                                                              ---------------
 
               TOTAL MORTGAGE-BACKED SECURITIES
               (IDENTIFIED COST $5,168,329,453)............................................     5,191,836,990
                                                                                              ---------------
 
               U.S. GOVERNMENT OBLIGATIONS (13.4%)
               U.S. Treasury Notes (4.1%)
       29,000  02/28/97..........................................................        6.875      29,073,370
       42,500  03/31/97..........................................................        6.875      42,660,650
       75,000  04/15/97..........................................................        8.50      75,653,250
       58,000  04/30/97..........................................................        6.875      58,294,640
       55,000  04/15/99..........................................................        7.00      56,235,850
                                                                                              ---------------
                                                                                                  261,917,760
                                                                                              ---------------
 
               U.S. Treasury Coupon Strips (9.3%)
      123,000  02/15/04..........................................................        0.00      78,426,030
      380,000  05/15/04..........................................................        0.00     238,001,600
      385,000  08/15/04..........................................................        0.00     237,129,200
       75,000  11/15/04..........................................................        0.00      45,396,750
                                                                                              ---------------
                                                                                                  598,953,580
                                                                                              ---------------
 
               TOTAL U.S. GOVERNMENT OBLIGATIONS
               (IDENTIFIED COST $778,502,738)..............................................       860,871,340
                                                                                              ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       34
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
PORTFOLIO OF INVESTMENTS DECEMBER 31, 1996, CONTINUED
 
<TABLE>
<CAPTION>
  PRINCIPAL                               DESCRIPTION
  AMOUNT IN                                   AND                                   COUPON
  THOUSANDS                              MATURITY DATE                               RATE          VALUE
- -------------------------------------------------------------------------------------------------------------
<C>            <S>                                                                 <C>        <C>
               U.S. GOVERNMENT AGENCIES (6.2%)
               Resolution Funding Corp Zero Coupon Strips
$      33,500  07/15/02..........................................................        0.00% $    23,649,660
       10,049  10/15/02..........................................................        0.00       6,975,614
      109,000  04/15/03..........................................................        0.00      72,932,990
       55,000  07/15/03..........................................................        0.00      36,196,600
       69,000  10/15/03..........................................................        0.00      44,616,090
      123,882  01/15/04..........................................................        0.00      78,748,072
      104,419  04/15/04..........................................................        0.00      65,220,107
       80,000  07/15/04..........................................................        0.00      49,127,200
       40,000  04/15/06..........................................................        0.00      21,746,800
        5,000  10/15/06..........................................................        0.00       2,626,900
                                                                                              ---------------
 
               TOTAL U.S. GOVERNMENT AGENCIES
               (IDENTIFIED COST $365,230,502)..............................................       401,840,033
                                                                                              ---------------
 
               TOTAL INVESTMENTS
               (IDENTIFIED COST $6,312,062,693) (B).............................  100.1%     6,454,548,363
 
               LIABILITIES IN EXCESS OF CASH AND OTHER ASSETS...................   (0.1)        (5,010,207)
                                                                                  ------   ---------------
 
               NET ASSETS.......................................................  100.0%   $ 6,449,538,156
                                                                                  ------   ---------------
                                                                                  ------   ---------------
 
<FN>
- ---------------------
GPM  Graduated Payment Mortgage.
(a)  Securities purchased on a forward commitment basis with an approximate
     principal amount and no definite maturity date; the actual principal
     amount and maturity date will be determined upon settlement.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $211,958,662 and the
     aggregate gross unrealized depreciation is $69,472,992, resulting in net
     unrealized appreciation of $142,485,670.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       35
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1996
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $6,312,062,693)..........................  $   6,454,548,363
Cash........................................................            449,209
Receivable for:
    Interest................................................         37,055,157
    Shares of beneficial interest sold......................         13,471,656
Prepaid expenses and other assets...........................            100,149
                                                              -----------------
 
     TOTAL ASSETS...........................................      6,505,624,534
                                                              -----------------
 
LIABILITIES:
Payable for:
    Investments purchased...................................         24,730,035
    Dividends to shareholders...............................         18,555,177
    Shares of beneficial interest repurchased...............          5,216,188
    Plan of distribution fee................................          4,283,834
    Investment management fee...............................          2,404,212
Accrued expenses and other payables.........................            896,932
                                                              -----------------
 
     TOTAL LIABILITIES......................................         56,086,378
                                                              -----------------
 
NET ASSETS:
Paid-in-capital.............................................      7,598,295,399
Net unrealized appreciation.................................        142,485,670
Dividends in excess of net investment income................             (4,722)
Accumulated net realized loss...............................     (1,291,238,191)
                                                              -----------------
 
     NET ASSETS.............................................  $   6,449,538,156
                                                              -----------------
                                                              -----------------
 
NET ASSET VALUE PER SHARE,
  723,414,184 SHARES OUTSTANDING (UNLIMITED SHARES
  AUTHORIZED OF $.01 PAR VALUE).............................
                                                                          $8.92
                                                              -----------------
                                                              -----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       36
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 1996
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME.............................................  $    533,679,451
                                                              ----------------
 
EXPENSES
Plan of distribution fee....................................        53,189,389
Investment management fee...................................        29,579,546
Transfer agent fees and expenses............................         4,382,628
Custodian fees..............................................         1,025,583
Shareholder reports and notices.............................           177,325
Professional fees...........................................           107,597
Registration fees...........................................            31,140
Trustees' fees and expenses.................................            22,931
Servicing fees..............................................            19,454
Other.......................................................            68,060
                                                              ----------------
 
     TOTAL EXPENSES.........................................        88,603,653
 
     LESS EXPENSE OFFSET....................................           (20,817)
                                                              ----------------
 
     NET EXPENSES...........................................        88,582,836
                                                              ----------------
 
     NET INVESTMENT INCOME..................................       445,096,615
                                                              ----------------
 
NET REALIZED AND UNREALIZED LOSS:
Net realized loss...........................................       (18,950,945)
Net change in unrealized appreciation.......................      (237,138,336)
                                                              ----------------
 
     NET LOSS...............................................      (256,089,281)
                                                              ----------------
 
NET INCREASE................................................  $    189,007,334
                                                              ----------------
                                                              ----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       37
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                                    FOR THE YEAR
                                                                FOR THE YEAR           ENDED
                                                                    ENDED           DECEMBER 31,
                                                              DECEMBER 31, 1996         1995
- --------------------------------------------------------------------------------------------------
<S>                                                           <C>                 <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income.......................................   $    445,096,615   $    522,928,136
Net realized loss...........................................        (18,950,945)       (77,736,417)
Net change in unrealized appreciation/depreciation..........       (237,138,336)       811,733,423
                                                              -----------------   ----------------
 
     NET INCREASE...........................................        189,007,334      1,256,925,142
 
Dividends from net investment income........................       (447,472,130)      (522,076,848)
Net decrease from transactions in shares of beneficial
  interest..................................................     (1,246,903,069)      (990,646,568)
                                                              -----------------   ----------------
 
     NET DECREASE...........................................     (1,505,367,865)      (255,798,274)
 
NET ASSETS:
Beginning of period.........................................      7,954,906,021      8,210,704,295
                                                              -----------------   ----------------
 
     END OF PERIOD
    (INCLUDING DIVIDENDS IN EXCESS OF NET INVESTMENT INCOME
    OF $4,722 AND UNDISTRIBUTED NET INVESTMENT INCOME OF
    $2,370,793, RESPECTIVELY)...............................   $  6,449,538,156   $  7,954,906,021
                                                              -----------------   ----------------
                                                              -----------------   ----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       38
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter U.S. Government Securities Trust (the "Fund") is registered under
the Investment Company Act of 1940, as amended (the "Act"), as a diversified,
open-end management investment company. The Fund's investment objective is high
current income consistent with safety of principal. The Fund seeks to achieve
its objective by investing in obligations issued or guaranteed by the U.S.
Government or its instrumentalities. The Fund was organized as a Massachusetts
business trust on September 29, 1983 and commenced operations on June 29, 1984.
 
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 -- (1) all portfolio securities for which
over-the-counter market quotations are readily available are valued at the
latest available bid price prior to the time of valuation; (2) when market
quotations are not readily available, including circumstances under which it is
determined by Dean Witter InterCapital Inc. (the "Investment Manager") that sale
or bid prices are not reflective of a security's market value, portfolio
securities are valued at their fair value as determined in good faith under
procedures established by and under the general supervision of the Trustees
(valuation of debt securities for which market quotations are not readily
available may be based upon current market prices of securities which are
comparable in coupon, rating and maturity or an appropriate matrix utilizing
similar factors); and (3) certain portfolio securities may be valued by an
outside pricing service approved by the Trustees. The pricing service may
utilize a matrix system incorporating security quality, maturity and coupon as
the evaluation model parameters, and/ or research and evaluations by its staff,
including review of broker-dealer market price quotations, if available, in
determining what it believes is the fair valuation of the securities valued by
such pricing service; (4) short-term debt securities having a maturity date of
more than sixty days at time of purchase are valued on a mark-to-market basis
until sixty days prior to maturity and thereafter at amortized cost based on
their value on the 61st day. Short-term securities having a maturity date of
sixty days or less at the time of purchase are valued at amortized cost.
 
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.
Discounts are accreted over the life of the respective securities. Interest
income is accrued daily.
 
                                       39
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
C. FEDERAL INCOME TAX STATUS -- It is the Fund'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 Fund records dividends
and distributions to its shareholders on the record date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an Investment Management Agreement with the Investment Manager, the
Fund pays the Investment Manager a management fee, accrued daily and payable
monthly, by applying the following annual rates to the Fund's net assets
determined at the close of each business day: 0.50% to the portion of daily net
assets not exceeding $1 billion; 0.475% to the portion of daily net assets
exceeding $1 billion but not exceeding $1.5 billion; 0.45% to the portion of
daily net assets exceeding $1.5 billion but not exceeding $2 billion; 0.425% to
the portion of daily net assets exceeding $2 billion but not exceeding $2.5
billion; 0.40% to the portion of daily net assets exceeding $2.5 billion but not
exceeding $5 billion; 0.375% to the portion of daily net assets exceeding $5
billion but not exceeding $7.5 billion; 0.35% to the portion of daily net assets
exceeding $7.5 billion but not exceeding $10 billion; 0.325% to the portion of
daily net assets exceeding $10 billion but not exceeding $12.5 billion; and
0.30% to the portion of daily net assets exceeding $12.5 billion.
 
Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund'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
 
                                       40
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
all personnel, including officers of the Fund 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 Fund.
 
3. PLAN OF DISTRIBUTION
 
Shares of the Fund are distributed by Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Investment Manager. The Fund has adopted a
Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the Act pursuant
to which the Fund pays the Distributor compensation, accrued daily and payable
monthly, at an annual rate of 0.75% (0.65% on amounts over $10 billion) of the
lesser of: (a) the average daily aggregate gross sales of the Fund's shares
since the Fund's inception (not including reinvestment of dividend or capital
gain distributions) less the average daily aggregate net asset value of the
Fund's shares redeemed since the Fund's inception upon which a contingent
deferred sales charge has been imposed or upon which such charge has been
waived; or (b) the Fund's average daily net assets. Amounts paid under the Plan
are paid to the Distributor to compensate it for the services provided and the
expenses borne by it and others in the distribution of the Fund's shares,
including the payment of commissions for sales of the Fund's shares and
incentive compensation to, and expenses of, the account executives of Dean
Witter Reynolds Inc., an affiliate of the Investment Manager and Distributor,
and other employees or selected broker-dealers who engage in or support
distribution of the Fund's shares or who service shareholder accounts, including
overhead and telephone expenses, printing and distribution of prospectuses and
reports used in connection with the offering of the Fund's shares to other than
current shareholders and preparation, printing and distribution of sales
literature and advertising materials. In addition, the Distributor may be
compensated under the Plan for its opportunity costs in advancing such amounts
which compensation would be in the form of a carrying charge on any unreimbursed
expenses incurred by the Distributor.
 
Provided that the Plan continues in effect, any cumulative expenses incurred by
the Distributor but not yet recovered, may be recovered through future
distribution fees from the Fund and contingent deferred sales charges from the
Fund's shareholders.
 
Although there is no legal obligation for the Fund to pay expenses incurred in
excess of payments made to the Distributor under the Plan and the proceeds of
contingent deferred sales charges paid by investors upon redemption of shares,
if for any reason the Plan is terminated, the Trustees will consider at that
time the manner in which to treat such expenses. The Distributor has advised the
Fund that such excess amounts, including carrying charges, total $68,120,003 at
December 31, 1996.
 
                                       41
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
The Distributor has informed the Fund that for the year ended December 31, 1996,
it received approximately $8,964,000 in contingent deferred sales charges from
certain redemptions of the Fund's shares.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The costs of purchases and sales/prepayments of portfolio securities, excluding
short-term investments, for the year ended December 31, 1996 were $541,075,742
and $1,760,020,882, respectively.
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At December 31, 1996, the Fund had
transfer agent fees and expenses payable of approximately $546,000.
 
The Fund has an unfunded noncontributory defined benefit pension plan covering
all independent Trustees of the Fund 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 December 31, 1996
included in Trustees' fees and expenses in the Statement of Operations amounted
to $1,285. At December 31, 1996, the Fund had an accrued pension liability of
$50,453 included in accrued expenses in the Statement of Assets and Liabilities.
 
5. SHARES OF BENEFICIAL INTEREST
 
Transactions in shares of beneficial interest were as follows:
<TABLE>
<CAPTION>
                                                                                                           FOR THE YEAR
                                                                                                              ENDED
                                                                           FOR THE YEAR ENDED              DECEMBER 31,
                                                                            DECEMBER 31, 1996                  1995
                                                                   -----------------------------------   ----------------
                                                                        SHARES             AMOUNT             SHARES
                                                                   ----------------   ----------------   ----------------
<S>                                                                <C>                <C>                <C>
Sold.............................................................        44,291,927   $    394,473,930         48,336,027
Reinvestment of dividends........................................        25,980,320        230,960,458         30,293,874
                                                                   ----------------   ----------------   ----------------
                                                                         70,272,247        625,434,388         78,629,901
Repurchased......................................................      (210,573,457)    (1,872,337,457)      (190,805,203)
                                                                   ----------------   ----------------   ----------------
Net decrease.....................................................      (140,301,210)  $ (1,246,903,069)      (112,175,302)
                                                                   ----------------   ----------------   ----------------
                                                                   ----------------   ----------------   ----------------
 
<CAPTION>
 
                                                                        AMOUNT
                                                                   ----------------
<S>                                                                <C>
Sold.............................................................  $    429,525,036
Reinvestment of dividends........................................       269,738,501
                                                                   ----------------
                                                                        699,263,537
Repurchased......................................................    (1,689,910,105)
                                                                   ----------------
Net decrease.....................................................  $   (990,646,568)
                                                                   ----------------
                                                                   ----------------
</TABLE>
 
                                       42
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS DECEMBER 31, 1996, CONTINUED
 
6. FEDERAL INCOME TAX STATUS
 
At December 31, 1996, the Fund had a net capital loss carryover which may be
used to offset future capital gains to the extent provided by regulations which
is available through December 31 of the following years:
 
<TABLE>
<CAPTION>
                                                IN THOUSANDS
  ---------------------------------------------------------------------------------------------------------
    1997        1998        1999        2000        2001        2002        2003        2004        Total
  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
  <S>         <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
  $ 270,987   $ 108,731   $ 261,525   $ 154,964   $ 263,492   $ 118,056   $  63,667   $  49,143   $1,290,565
  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
</TABLE>
 
Capital losses incurred after October 31 ("post-October" losses) within the
taxable year are deemed to arise on the first business day of the Fund's next
taxable year. The Fund incurred and will elect to defer net capital losses of
approximately $673,000 during fiscal 1996.
 
At December 31, 1996, the Fund had temporary book/tax differences primarily
attributable to post-October losses and a permanent book/tax difference
attributable to an expired capital loss carryover. To reflect reclassifications
arising from permanent book/tax differences for the year ended December 31,
1996, accumulated net realized loss was credited and paid-in-capital was charged
$277,199,313.
 
                                       43
<PAGE>
DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
<TABLE>
<CAPTION>
                                                           FOR THE YEAR ENDED DECEMBER 31
                  ----------------------------------------------------------------------------------------------------------------
                     1996       1995       1994        1993       1992       1991        1990       1989       1988        1987
- ----------------------------------------------------------------------------------------------------------------------------------
 
<S>               <C>         <C>        <C>        <C>         <C>        <C>        <C>         <C>        <C>        <C>
PER SHARE OPERATING
PERFORMANCE:
 
Net asset value,
 beginning of
 period.......... $     9.21  $    8.41  $    9.31  $     9.30  $    9.52  $    9.37  $     9.51  $    9.42  $    9.75  $    10.33
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Net investment
 income..........       0.56       0.57       0.58        0.64       0.74       0.87        0.90       0.91       0.97        0.96
Net realized and
 unrealized gain
 (loss)..........      (0.29)      0.80      (0.90)       0.01      (0.22)      0.15       (0.14)      0.09      (0.33)      (0.58)
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Total from
 investment
 operations......       0.27       1.37      (0.32)       0.65       0.52       1.02        0.76       1.00       0.64        0.38
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Less dividends
 from net
 investment
 income..........      (0.56)     (0.57)     (0.58)      (0.64)     (0.74)     (0.87)      (0.90)     (0.91)     (0.97)      (0.96)
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
Net asset value,
 end of period... $     8.92  $    9.21  $    8.41  $     9.31  $    9.30  $    9.52  $     9.37  $    9.51  $    9.42  $     9.75
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
                  ----------  ---------  ---------  ----------  ---------  ---------  ----------  ---------  ---------  ----------
 
TOTAL INVESTMENT
RETURN+..........       3.16%     16.74%     (3.51)%       7.13%      5.76%     11.43%       8.49%     11.10%      6.74%       3.92%
 
RATIOS TO AVERAGE
NET ASSETS:
Expenses.........       1.25%      1.24%      1.22%       1.18%      1.20%      1.17%       1.23%      1.19%      1.21%       1.18%
 
Net investment
 income..........       6.28%      6.44%      6.57%       6.78%      7.91%      9.23%       9.60%      9.62%     10.01%       9.63%
 
SUPPLEMENTAL DATA:
Net assets, end
 of period, in
 millions........     $6,450     $7,955     $8,211     $12,235    $12,484    $11,736      $9,829    $10,167    $10,366     $10,418
 
Portfolio
 turnover rate...          8%        14%        26%         32%        40%       104%         54%        44%        15%         51%
</TABLE>
 
<TABLE>
<C>  <S>
<FN>
 
- ---------------------
 +   Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       44
<PAGE>

                  DEAN WITTER U.S. GOVERNMENT SECURITIES 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 fiscal years
               ended December 31, 1987, 1988, 1989,
                         1990, 1991, 1992, 1993, 1994, 1995 and
                         1996................................................6


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

                    Portfolio of Investments at December 31, 1996...........34

                    Statement of assets and liabilities at
                    December 31, 1996.......................................36

                    Statement of operations for the year
                    ended December 31, 1996.................................37

                    Statement of changes in net assets for the years
                    ended December 31, 1995 and 1996........................38

                    Notes to Financial Statements ..........................39

                    Financial highlights for the fiscal years ended
                    December 31, 1987, 1988, 1989, 1990, 1991, 1992,
                    1993, 1994, 1995 and 1996...............................44

          (3)  Financial statements included in Part C:

                    None

     (b)  EXHIBITS:

     1.        -         Form of Instrument Establishing and Designating
                         Additional Classes.

                                        1
<PAGE>

     5.        -         Form of Investment Management Agreement between the
                         Registrant and Dean Witter InterCapital Inc., to take
                         effect upon the proposed merger of Dean Witter,
                         Discover & Co. with Morgan Stanley Group Inc. (the
                         "Merger").

     6.(a)     -         Form of Distribution Agreement between the Registrant
                         and Dean Witter Distributors Inc., to take effect upon
                         the Merger.

     6.(b)     -         Form of Multi-Class Distribution Agreement between the
                         Registrant and Dean Witter Distributors Inc.

     11.       -         Consent of Independent Accountants.

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

  Other.       -         Form of Multiple Class Plan pursuant to Rule 18f-3.

- ------------------------------
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 April 30, 1997
     --------------                            ------------------------

Shares of Beneficial Interest                           262,149

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

                                        2
<PAGE>

Registrant.  Trustees, officers, employees and agents will be indemnified for
the expense of litigation if it is determined that they are entitled to
indemnification against any liability established in such litigation.  The
Registrant may also advance money for these expenses provided that they give
their undertakings to repay the Registrant unless their conduct is later
determined to permit indemnification.


     Pursuant to Section 5.2 of the Registrant's Declaration of Trust and
paragraph 8 of the Registrant's Investment Management Agreement, neither the
Investment Manager nor any trustee, officer, employee or agent of the Registrant
shall be liable for any action or failure to act, except in the case of bad
faith, willful misfeasance, gross negligence or reckless disregard of duties to
the Registrant.

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

                                        3
<PAGE>

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
 (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

                                        4
<PAGE>

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

                                        5
<PAGE>

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


<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
Charles A. Fiumefreddo             Executive Vice President and Director of Dean Witter Reynolds Inc. 
Chairman, Chief                    ("DWR"); Chairman, Chief Executive Officer and Director of Dean Witter
Executive Officer and              Distributors Inc. ("Distributors") and Dean Witter Services Company Inc. ("DWSC");
Director                           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 DWDC and DWR; Director of DWSC and
Director                           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 Chief Operating Officer of Dean Witter 
Director                           Capital, a division of DWR; Member of the DWDC Management Committee; Director of DWR, 
                                   DWSC, Distributors and DWTC; Trustee of the TCW/DW Funds.
</TABLE>

                                      6
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
James F. Higgins                   Executive Vice President of DWDC; President and Chief Operating Officer of Dean Witter 
Director                           Financial; Director of DWR, DWSC, Distributors and DWTC.

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

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

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

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

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

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

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

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

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


Richard Felegy
Senior Vice President
</TABLE>

                                      7
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
Edward Gaylor                      Vice President of various Dean Witter Funds.
Senior Vice President

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

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

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

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

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

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

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

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

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

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

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

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

Elizabeth A. Vetell
Senior Vice President

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

Ronald J. Worobel                  Vice President of various Dean Witter Funds.
Senior Vice President
</TABLE>

                                      8
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
Thomas F. Caloia                   First Vice President and Assistant Treasurer of DWSC, Assistant Treasurer of
First Vice President               Distributors; Treasurer and Chief Financial Officer of the Dean Witter Funds 
Treasurer                          and the TCW/DW Funds.

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

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

Robert Zimmerman
First Vice President

Joan Allman
Vice President

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

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

Douglas Brown
Vice President


Philip Casparius
Vice President

Thomas Chronert
Vice President

Rosalie Clough
Vice President

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

B. Catherine Connelly
Vice President

Salvatore DeSteno                  Vice President of DWSC.
Vice President

Frank J. DeVito                    Vice President of DWSC.
Vice President
</TABLE>

                                      9
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
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 of various Dean Witter Funds
Vice President

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

David Johnson
Vice President

Christopher Jones
Vice President

James Kastberg
Vice President

Stanley Kapica
Vice President

Michael Knox                       Vice President of various Dean Witter Funds
Vice President

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

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

Thomas Lawlor
Vice President

Gerard Lian                        Vice President of various Dean Witter Funds.
Vice President
</TABLE>

                                      10
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
LouAnne D. McInnis                 Vice President and Assistant Secretary of DWSC; Assistant Secretary of the 
Vice President and                 Dean Witter Funds and the TCW/DW Funds.
Assistant Secretary

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

Hugh Rose
Vice President

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

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

Carl F. Sadler
Vice President

Rafael Scolari                     Vice President of Prime Income Trust
Vice President

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

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

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

Vinh Q. Tran                       Vice President of various Dean Witter Funds.
Vice President
</TABLE>

                                      11
<PAGE>

<TABLE>
<CAPTION>

NAME AND POSITION                  OTHER SUBSTANTIAL BUSINESS, PROFESSION, VOCATION
WITH DEAN WITTER                   OR EMPLOYMENT, INCLUDING NAME, PRINCIPAL ADDRESS
INTERCAPITAL INC.                  AND NATURE OF CONNECTION
- -----------------                  -----------------------------------------------------------------------------------------
<S>                               <C>
Alice Weiss                        Vice President of various Dean Witter Funds.
Vice President

Katherine Wickham
Vice President
</TABLE>

Item 29.       PRINCIPAL UNDERWRITERS

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

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

                                       12
<PAGE>

(38)           Dean Witter Global Dividend Growth Securities
(39)           Dean Witter American Value Fund
(40)           Dean Witter U.S. Government Money Market Trust
(41)           Dean Witter Global Short-Term Income Fund Inc.
(42)           Dean Witter Value-Added Market Series
(43)           Dean Witter Global Utilities Fund
(44)           Dean Witter High Income Securities
(45)           Dean Witter National Municipal Trust
(46)           Dean Witter International SmallCap Fund
(47)           Dean Witter Balanced Growth Fund
(48)           Dean Witter Balanced Income Fund
(49)           Dean Witter Hawaii Municipal Trust
(50)           Dean Witter Variable Investment Series
(51)           Dean Witter Capital Appreciation Fund
(52)           Dean Witter Intermediate Term U.S. Treasury Trust
(53)           Dean Witter Information Fund
(54)           Dean Witter Japan Fund
(55)           Dean Witter Income Builder Fund
(56)           Dean Witter Special Value Fund
(57)           Dean Witter Financial Services Trust
(58)           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
 (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.


                                       13
<PAGE>

Item 30.       LOCATION OF ACCOUNTS AND RECORDS

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


Item 31.       MANAGEMENT SERVICES

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

Item 32.       UNDERTAKINGS

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



                                     14

<PAGE>

                                      SIGNATURES
                                           

    Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940,  the Registrant certifies that it 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 28th day of May, 1997.


                      DEAN WITTER U.S. GOVERNMENT SECURITIES 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. 15 to the Registration Statement 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                             05/28/97
    --------------------------
        Charles A. Fiumefreddo

(2) Principal Financial Officer   Treasurer and Principal
                                  Accounting Officer
                   
By  /s/ Thomas F. Caloia                                   05/28/97
    --------------------------
        Thomas F. Caloia

(3) Majority of the Trustees  

    Charles A. Fiumefreddo (Chairman)
    Philip J. Purcell
                      

By  /s/ Barry Fink                                         05/28/97
    --------------------------
        Barry Fink
      Attorney-in-Fact

    Michael Bozic              Manuel H. Johnson
    Edwin J. Garn              Michael E. Nugent
    John R. Haire              John L. Schroeder
          
       
By  /s/ David Butowsky                                     05/28/97
    --------------------------
         David Butowsky     
        Attorney-in-Fact 
<PAGE>

                  DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

                                  EXHIBIT INDEX

     1.        -    Form of Instrument Establishing and Designating             
                    Additional Classes.

     5.        -    Form of Investment Management Agreement between the
                    Registrant and Dean Witter InterCapital Inc.,to take effect
                    upon the proposed merger of Dean Witter, Discover & Co. with
                    Morgan Stanley Group Inc. (the "Merger").

     6.(a)     -    Form of Distribution Agreement between the Registrant and
                    Dean Witter Distributors Inc., to take effect upon the
                    Merger.

     6.(b)     -    Form of Multi-Class Distribution Agreement between          
                    the Registrant and Dean Witter Distributors Inc.

     11.       -    Consent of Independent Accountants.

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

  Other.       -    Form of Multiple Class Plan pursuant to Rule 18f-3.

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

<PAGE>


                                   CERTIFICATE


     The undersigned hereby certifies that he is the Secretary of Dean Witter
U.S. Government Securities Trust (the "Trust"), an unincorporated business trust
organized under the laws of the Commonwealth of Massachusetts, that annexed
hereto is an Instrument Establishing and Designating Additional Classes of
Shares of the Trust unanimously adopted by the Trustees of the Trust on ______
___ , as provided in Section 6.9(g) of the said Declaration, said Instrument to
take effect on July 28, 1997, and I do hereby further certify that such
Instrument has not been amended and is on the date hereof in full force and
effect.

          Dated this           day of          , 1997.
                     ---------        ---------



                                        -------------------------------
                                        Barry Fink 
                                        Secretary




(SEAL)    
 <PAGE>
                  DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST

                     INSTRUMENT ESTABLISHING AND DESIGNATING
                          ADDITIONAL CLASSES OF SHARES

WHEREAS, Dean Witter U.S. Government Securities Trust (the "Trust") was
established by the Declaration of Trust dated September 29, 1983, as amended
from time to time (the "Declaration"), under the laws of the Commonwealth of
Massachusetts;

WHEREAS, Section 6.9(g) of the Declaration provides that the establishment and
designation of any additional class of shares shall be effective upon the
execution by a majority of the then Trustees of an instrument setting forth such
establishment and designation and the relative rights, preferences, voting
powers, restrictions, limitations as to dividends, qualifications, and terms and
conditions of such class, or as otherwise provided in such instrument, which
instrument shall have the status of an amendment to the Declaration; and

WHEREAS, the Trustees of the Trust have deemed it advisable to establish and
designate three additional classes of shares and to designate classes for the
existing shares held prior to July 28, 1997 ("Existing Class") as provided
herein.

NOW, THEREFORE, BE IT RESOLVED, pursuant to Section 6.9(g) of the Declaration,
there are hereby established and designated three additional classes of shares,
to be known as:  Class A, Class C and Class D (the "Additional Classes"), each
of which shall be subject to the relative rights, preferences, voting powers,
restrictions, limitations as to dividends, qualifications, and terms and
conditions of redemption set forth in the Declaration with respect to the
Existing Class, except to the extent the DEAN WITTER FUNDS MULTIPLE CLASS PLAN
PURSUANT TO RULE 18f-3 attached hereto as EXHIBIT A sets forth differences (i)
between each of the Additional Classes, or (ii) among each of the Existing Class
and the Additional Classes; and be it further

RESOLVED, pursuant to Section 6.9(g) of the Declaration, all shares of the Trust
held prior to July 28, 1997 are hereby designated as Class B shares of the
Trust, except that shares held by certain employee benefit plans established by
Dean Witter Reynolds Inc. and its affiliate, SPS Transaction Services, Inc., are
hereby designated as Class D shares.

This instrument may be executed in more than one counterpart, each of which
shall be deemed an original, but all of which together shall constitute one and
the same document.


<PAGE>

IN WITNESS THEREOF, the undersigned, the Trustees of the Trust, have executed
this instrument this __________ day of  ______________.



- ----------------------------------     ------------------------------ 
Michael Bozic, as Trustee               Manuel H. Johnson, as Trustee   
and not individually                    and not individually
c/o Levitz Furniture Corp.              c/o Johnson Smick International Inc.
6111 Broken Sound Parkway, N.W.         1133 Connecticut Avenue, N.W.  
Boca Raton, FL  33487                   Washington, D.C.  20036
                       
- ----------------------------------     ------------------------------ 
Charles A. Fiumefreddo, as Trustee      Michael E. Nugent, as Trustee
and not individually                    and not individually
Two World Trade Center                  c/o Triumph Capital, L.P.
New York, NY  10048                     237 Park Avenue
                                        New York, NY  10017



- ---------------------------------      ------------------------------ 
Edwin J. Garn, as Trustee               Philip J. Purcell, as Trustee
and not individually                    and not individually
c/o Huntsman Chemical Corporation       Two World Trade Center
500 Huntsman Way                        New York, NY  10048
Salt Lake City, UT  84111                    


     
                                
- ----------------------------            ------------------------------ 
John R. Haire, as Trustee               John L. Schroeder, as Trustee
and not individually                    and not individually
Two World Trade Center                  c/o Gordon Altman Butowsky Weitzen
New York, NY  10048                       Shalov & Wein 
                                        Counsel to the Independent Trustees
                                        114 West 47th Street
                                        New York, NY  10036
 
<PAGE>

STATE OF NEW YORK   )
                    )ss:
COUNTY OF NEW YORK  )



     On this ___________day of ____________ , MICHAEL BOZIC, CHARLES A.
FIUMEFREDDO, EDWIN J. GARN, JOHN R. HAIRE, MANUEL H. JOHNSON, MICHAEL E. NUGENT,
PHILIP J. PURCELL and JOHN L. SCHROEDER, known to me to be the individuals
described in and who executed the foregoing instrument, personally appeared
before me and they severally acknowledged the foregoing instrument to be their
free act and deed.




                                   -------------------------------------
                                   Notary Public


My Commission expires:
<PAGE>
                               DEAN WITTER FUNDS
                              MULTIPLE CLASS PLAN
                             PURSUANT TO RULE 18f-3
 
INTRODUCTION
 
    This plan (the "Plan") is adopted pursuant to Rule 18f-3(d) of the
Investment Company Act of 1940, as amended (the "1940 Act"), and will be
effective as of July 28, 1997. The Plan relates to shares of the open-end
investment companies to which Dean Witter InterCapital Inc. acts as investment
manager, that are listed on Schedule A, as may be amended from time to time
(each, a "Fund" and collectively, the "Funds"). The Funds are distributed
pursuant to a system (the "Multiple Class System") in which each class of shares
(each, a "Class" and collectively, the "Classes") of a Fund represents a pro
rata interest in the same portfolio of investments of the Fund and differs only
to the extent outlined below.
 
I.  DISTRIBUTION ARRANGEMENTS
 
    One or more Classes of shares of the Funds are offered for purchase by
investors with the sales load structures described below. In addition, pursuant
to Rule 12b-1 under the 1940 Act, the Funds have each adopted a Plan of
Distribution (the "12b-1 Plan") under which shares of certain Classes are
subject to the service and/or distribution fees ("12b-1 fees") described below.
 
    1.  CLASS A SHARES
 
    Class A shares are offered with a front-end sales load ("FESL"). The
schedule of sales charges applicable to a Fund and the circumstances under which
the sales charges are subject to reduction are set forth in each Fund's current
prospectus. As stated in each Fund's current prospectus, Class A shares may be
purchased at net asset value (without a FESL): (i) in the case of certain large
purchases of such shares; and (ii) by certain limited categories of investors,
in each case, under the circumstances and conditions set forth in each Fund's
current prospectus. Class A shares purchased at net asset value may be subject
to a contingent deferred sales charge ("CDSC") on redemptions made within one
year of purchase. Further information relating to the CDSC, including the manner
in which it is calculated, is set forth in paragraph 6 below. Class A shares are
also subject to payments under each Fund's 12b-1 Plan to reimburse Dean Witter
Distributors Inc., Dean Witter Reynolds Inc. ("DWR"), its affiliates and other
broker-dealers for distribution expenses incurred by them specifically on behalf
of the Class, assessed at an annual rate of up to 0.25% of average daily net
assets. The entire amount of the 12b-1 fee represents a service fee within the
meaning of National Association of Securities Dealers, Inc. ("NASD") guidelines.
 
    2.  CLASS B SHARES
 
    Class B shares are offered without a FESL, but will in most cases be subject
to a six-year declining CDSC which is calculated in the manner set forth in
paragraph 6 below. Class B shares purchased by certain qualified
employer-sponsored benefit plans are subject to a three-year declining CDSC
which is calculated in the manner set forth in paragraph 6 below. The schedule
of CDSC charges applicable to each Fund is set forth in each Fund's current
prospectus. With the exception of certain of the Funds which have a different
formula described below (Dean Witter American Value Fund, Dean Witter Natural
Resource Development Securities Inc., Dean Witter Strategist Fund and Dean
Witter Dividend Growth Securities Inc.)(1), Class B
 
- ------------
 
(1)The payments under the 12b-1 Plan for each of Dean Witter American Value
Fund, Dean Witter Natural Resource Development Securities Inc. and Dean Witter
Dividend Growth Securities Inc. are assessed at the annual rate of 1.0% of the
lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the Fund's Plan (not including reinvestment of
dividends or capital gains distributions), less the average daily aggregate net
asset value of the Fund's Class B shares redeemed since the Plan's inception
upon which a contingent deferred sales charge has been imposed or waived, or (b)
the average daily net assets of Class B attributable to shares issued, net of
related shares redeemed, since inception of the Plan. The payments under the
12b-1 Plan for the Dean Witter Strategist Fund are assessed at the annual rate
of: (i) 1% of the lesser of (a) the average daily aggregate gross sales of the
Fund's Class B shares since the effectiveness of the first amendment of the Plan
on November 8, 1989 (not including reinvestment of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the effectiveness of the first amended Plan, upon
which a contingent deferred sales charge has been imposed or waived, or (b) the
average daily net assets of Class B attributable to shares issued, net of
related shares redeemed, since the effectiveness of the first amended Plan; plus
(ii) 0.25% of the average daily net assets of Class B attributable to shares
issued, net of related shares redeemed, prior to effectiveness of the first
amended Plan.
 
                                       1
<PAGE>
shares are also subject to a fee under each Fund's respective 12b-1 Plan,
assessed at the annual rate of up to 1.0% of either: (a) the lesser of (i) the
average daily aggregate gross sales of the Fund's Class B shares since the
inception of the Fund (not including reinvestment of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the Fund's inception upon which a CDSC has been
imposed or waived, or (ii) the average daily net assets of Class B; or (b) the
average daily net assets of Class B. A portion of the 12b-1 fee equal to up to
0.25% of the Fund's average daily net assets is characterized as a service fee
within the meaning of the NASD guidelines and the remaining portion of the 12b-1
fee, if any, is characterized as an asset-based sales charge. Also, Class B
shares have a conversion feature ("Conversion Feature") under which such shares
convert to Class A shares after a certain holding period. Details of the
Conversion Feature are set forth in Section IV below.
 
    3.  CLASS C SHARES
 
    Class C shares are offered without imposition of a FESL, but will in most
cases be subject to a CDSC of 1.0% on redemptions made within one year after
purchase. Further information relating to the CDSC is set forth in paragraph 6
below. In addition, Class C shares, under each Fund's 12b-1 Plan, are subject to
12b-1 payments to reimburse Dean Witter Distributors Inc., DWR, its affiliates
and other broker-dealers for distribution expenses incurred by them specifically
on behalf of the Class, assessed at the annual rate of up to 1.0% of the average
daily net assets of the Class. A portion of the 12b-1 fee equal to up to 0.25%
of the Fund's average daily net assets is characterized as a service fee within
the meaning of NASD guidelines. Unlike Class B shares, Class C shares do not
have the Conversion Feature.
 
    4.  CLASS D SHARES
 
    Class D shares are offered without imposition of a FESL, CDSC or a 12b-1 fee
for purchases of Fund shares by (i) investors meeting an initial minimum
investment requirement and (ii) certain other limited categories of investors,
in each case, as may be approved by the Boards of Directors/Trustees of the
Funds and as disclosed in each Fund's current prospectus.
 
    5.  ADDITIONAL CLASSES OF SHARES
 
    The Boards of Directors/Trustees of the Funds have the authority to create
additional Classes, or change existing Classes, from time to time, in accordance
with Rule 18f-3 under the 1940 Act.
 
    6.  CALCULATION OF THE CDSC
 
    Any applicable CDSC is calculated based upon the lesser of net asset value
of the shares at the time of purchase or at the time of redemption. The CDSC
does not apply to amounts representing an increase in share value due to capital
appreciation and shares acquired through the reinvestment of dividends or
capital gains distributions. The CDSC schedule applicable to a Fund and the
circumstances in which the CDSC is subject to waiver are set forth in each
Fund's prospectus.
 
II.  EXPENSE ALLOCATIONS
 
    Expenses incurred by a Fund are allocated among the various Classes of
shares pro rata based on the net assets of the Fund attributable to each Class,
except that 12b-1 fees relating to a particular Class are allocated directly to
that Class. In addition, other expenses associated with a particular Class
(except advisory or custodial fees), may be allocated directly to that Class,
provided that such expenses are reasonably identified as specifically
attributable to that Class and the direct allocation to that Class is approved
by the Fund's Board of Directors/Trustees.
 
III.  CLASS DESIGNATION
 
    All shares of the Funds held prior to July 28, 1997 (other than the shares
held by certain employee benefit plans established by DWR and its affiliate, SPS
Transaction Services, Inc., shares of Funds offered with a FESL, and shares of
Dean Witter Balanced Growth Fund and Dean Witter Balanced Income Fund) have been
designated Class B shares. Shares held prior to July 28, 1997 by such employee
benefit plans have been designated Class D shares. Shares held prior to July 28,
1997 of Funds offered with a FESL have been designated Class D shares. In
addition, shares of Dean Witter American Value Fund purchased prior to April 30,
1984, shares of Dean Witter Strategist Fund purchased prior to November 8, 1989
and shares of Dean Witter Natural Resource Development Securities Inc. and Dean
Witter Dividend Growth Securities Inc. purchased prior to July 2, 1984 (with
respect to such shares of each Fund, including such proportion of shares
acquired through reinvestment of dividends and capital gains distributions as
the total number of shares acquired prior to each of the preceding dates in this
sentence bears to the total number of shares purchased and owned by the
shareholder of that Fund) have been designated Class D shares. Shares of Dean
Witter Balanced Growth Fund and Dean Witter Balanced Income Fund held prior to
July 28, 1997 have
 
                                       2
<PAGE>
been designated Class C shares except that shares of Dean Witter Balanced Growth
Fund and Dean Witter Balanced Income Fund held prior to July 28, 1997 that were
acquired in exchange for shares of a Fund offered with a CDSC have been
designated Class B shares and those that were acquired in exchange for shares of
a Fund offered with a FESL have been designated Class A shares.
 
IV.  THE CONVERSION FEATURE
 
    Class B shares held before May 1, 1997 will convert to Class A shares in
May, 2007, except that Class B shares which are purchased before July 28, 1997
by trusts for which Dean Witter Trust Company ("DWTC") or Dean Witter Trust FSB
("DWTFSB") provides discretionary trustee services will convert to Class A
shares on or about August 29, 1997 (the CDSC will not be applicable to such
shares upon the conversion). In all other instances, Class B shares of each Fund
will automatically convert to Class A shares, based on the relative net asset
values of the shares of the two Classes on the conversion date, which will be
approximately ten (10) years after the date of the original purchase.
Conversions will be effected once a month. The 10 year period will be calculated
from the last day of the month in which the shares were purchased or, in the
case of Class B shares acquired through an exchange or a series of exchanges,
from the last day of the month in which the original Class B shares were
purchased, provided that shares originally purchased before May 1, 1997 will
convert to Class A shares in May, 2007. Except as set forth below, the
conversion of shares purchased on or after May 1, 1997 will take place in the
month following the tenth anniversary of the purchase. There will also be
converted at that time such proportion of Class B shares acquired through
automatic reinvestment of dividends owned by the shareholder as the total number
of his or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a 401(k) plan or other employer-sponsored plan
qualified under Section 401(a) of the Internal Revenue Code (the "Code") and for
which DWTC or DWTFSB serves as Trustee or the 401(k) Support Services Group of
DWR serves as recordkeeper, all Class B shares will convert to Class A shares on
the conversion date of the first shares of a Fund purchased by that plan. In the
case of Class B shares previously exchanged for shares of an "Exchange Fund" (as
such term is defined in the prospectus of each Fund), the period of time the
shares were held in the Exchange Fund (calculated from the last day of the month
in which the Exchange Fund shares were acquired) is excluded from the holding
period for conversion. If those shares are subsequently re-exchanged for Class B
shares of a Fund, the holding period resumes on the last day of the month in
which Class B shares are reacquired.
 
    Effectiveness of the Conversion Feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel to the effect that (i) the conversion of shares does not constitute a
taxable event under the Code; (ii) Class A shares received on conversion will
have a basis equal to the shareholder's basis in the converted Class B shares
immediately prior to the conversion; and (iii) Class A shares received on
conversion will have a holding period that includes the holding period of the
converted Class B shares. The Conversion Feature may be suspended if the Ruling
or opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B fees under the applicable Fund's 12b-1 Plan.
 
V.  EXCHANGE PRIVILEGES
 
    Shares of each Class may be exchanged for shares of the same Class of the
other Funds without the imposition of an exchange fee as described in the
prospectuses and statements of additional information of the Funds. The exchange
privilege of each Fund may be terminated or revised at any time by the Fund upon
such notice as may be required by applicable regulatory agencies as described in
each Fund's prospectus.
 
VI.  VOTING
 
    Each Class shall have exclusive voting rights on any matter that relates
solely to its 12b-1 Plan, except that Class B shareholders will have the right
to vote on any proposed material increase in Class A's expenses, including
payments under the Class A 12b-1 Plan, if such proposal is submitted separately
to Class A shareholders. If the amount of expenses, including payments under the
Class A 12b-1 Plan, is increased materially without the approval of Class B
shareholders, the Fund will establish a new Class A for Class B shareholders
whose shares automatically convert on the same terms as applied to Class A
before the increase. In addition, each Class shall have separate voting rights
on any matter submitted to shareholders in which the interests of one Class
differ from the interests of any other Class.
 
                                       3
<PAGE>
                               DEAN WITTER FUNDS
                   MULTIPLE CLASS PLAN PURSUANT TO RULE 18f-3
                                   SCHEDULE A
                                AT JULY 28, 1997
 
<TABLE>
<S>        <C>
1)         Dean Witter American Value Fund
2)         Dean Witter Balanced Growth Fund
3)         Dean Witter Balanced Income Fund
4)         Dean Witter California Tax-Free Income Fund
5)         Dean Witter Capital Appreciation Fund
6)         Dean Witter Capital Growth Securities
7)         Dean Witter Convertible Securities Trust
8)         Dean Witter Developing Growth Securities Trust
9)         Dean Witter Diversified Income Trust
10)        Dean Witter Dividend Growth Securities Inc.
11)        Dean Witter European Growth Fund Inc.
12)        Dean Witter Federal Securities Trust
13)        Dean Witter Financial Services Trust
14)        Dean Witter Global Asset Allocation Fund
15)        Dean Witter Global Dividend Growth Securities
16)        Dean Witter Global Utilities Fund
17)        Dean Witter Health Sciences Trust
18)        Dean Witter High Yield Securities Inc.
19)        Dean Witter Income Builder Fund
20)        Dean Witter Information Fund
21)        Dean Witter Intermediate Income Securities
22)        Dean Witter International SmallCap Fund
23)        Dean Witter Japan Fund
24)        Dean Witter Managers' Select Fund
25)        Dean Witter Market Leader Trust
26)        Dean Witter Mid-Cap Growth Fund
27)        Dean Witter Natural Resource Development Securities Inc.
28)        Dean Witter New York Tax-Free Income Fund
29)        Dean Witter Pacific Growth Fund Inc.
30)        Dean Witter Precious Metals and Minerals Trust
31)        Dean Witter Special Value Fund
32)        Dean Witter Strategist Fund
33)        Dean Witter Tax-Exempt Securities Trust
34)        Dean Witter U.S. Government Securities Trust
35)        Dean Witter Utilities Fund
36)        Dean Witter Value-Added Market Series/Equity Portfolio
37)        Dean Witter World Wide Income Trust
38)        Dean Witter World Wide Investment Trust
</TABLE>
 
                                       4

<PAGE>
                        INVESTMENT MANAGEMENT AGREEMENT
 
    AGREEMENT made as of the 31st day of May, 1997 by and between Dean Witter
U.S. Government Securities Trust, an unincorporated business trust organized
under the laws of the Commonwealth of Massachusetts (hereinafter called the
"Fund"), and Dean Witter InterCapital Inc., a Delaware corporation (hereinafter
called the "Investment Manager"):
 
    WHEREAS, The Fund is engaged in business as an open-end management
investment company and is registered as such under the Investment Company Act of
1940, as amended (the "Act"); and
 
    WHEREAS, The Investment Manager is registered as an investment adviser under
the Investment Advisers Act of 1940, and engages in the business of acting as
investment adviser; and
 
    WHEREAS, The Fund desires to retain the Investment Manager to render
management and investment advisory services in the manner and on the terms and
conditions hereinafter set forth; and
 
    WHEREAS, The Investment Manager desires to be retained to perform services
on said terms and conditions:
 
    Now, Therefore, this Agreement
 
                              W I T N E S S E T H:
 
that in consideration of the premises and the mutual covenants hereinafter
contained, the Fund and the Investment Manager agree as follows:
 
     1. The Fund hereby retains the Investment Manager to act as investment
manager of the Fund and, subject to the supervision of the Trustees, to
supervise the investment activities of the Fund as hereinafter set forth.
Without limiting the generality of the foregoing, the Investment Manager shall
obtain and evaluate such information and advice relating to the economy,
securities and commodities markets and securities and commodities as it deems
necessary or useful to discharge its duties hereunder; shall continuously manage
the assets of the Fund in a manner consistent with the investment objectives and
policies of the Fund; shall determine the securities and commodities to be
purchased, sold or otherwise disposed of by the Fund and the timing of such
purchases, sales and dispositions; and shall take such further action, including
the placing of purchase and sale orders on behalf of the Fund, as the Investment
Manager shall deem necessary or appropriate. The Investment Manager shall also
furnish to or place at the disposal of the Fund such of the information,
evaluations, analyses and opinions formulated or obtained by the Investment
Manager in the discharge of its duties as the Fund may, from time to time,
reasonably request.
 
     2. The Investment Manager shall, at its own expense, maintain such staff
and employ or retain such personnel and consult with such other persons as it
shall from time to time determine to be necessary or useful to the performance
of its obligations under this Agreement. Without limiting the generality of the
foregoing, the staff and personnel of the Investment Manager shall be deemed to
include persons employed or otherwise retained by the Investment Manager to
furnish statistical and other factual data, advice regarding economic factors
and trends, information with respect to technical and scientific developments,
and such other information, advice and assistance as the Investment Manager may
desire. The Investment Manager shall, as agent for the Fund, maintain the Fund's
records and books of account (other than those maintained by the Fund's transfer
agent, registrar, custodian and other agencies). All such books and records so
maintained shall be the property of the Fund and, upon request therefor, the
Investment Manager shall surrender to the Fund such of the books and records so
requested.
 
     3. The Fund will, from time to time, furnish or otherwise make available to
the Investment Manager such financial reports, proxy statements and other
information relating to the business and affairs of the Fund as the Investment
Manager may reasonably require in order to discharge its duties and obligations
hereunder.
 
     4. The Investment Manager shall bear the cost of rendering the investment
management and supervisory services to be performed by it under this Agreement,
and shall, at its own expense, pay the compensation of the officers and
employees, if any, of the Fund, and provide such office space, facilities and
equipment
<PAGE>
and such clerical help and bookkeeping services as the Fund shall reasonably
require in the conduct of its business. The Investment Manager shall also bear
the cost of telephone service, heat, light, power and other utilities provided
to the Fund.
 
     5. The Fund assumes and shall pay or cause to be paid all other expenses of
the Fund, including without limitation: fees pursuant to any plan of
distribution that the Fund may adopt; the charges and expenses of any registrar,
any custodian or depository appointed by the Fund for the safekeeping of its
cash, portfolio securities or commodities and other property, and any stock
transfer or dividend agent or agents appointed by the Fund; brokers' commissions
chargeable to the Fund in connection with portfolio transactions to which the
Fund is a party; all taxes, including securities or commodities issuance and
transfer taxes, and fees payable by the Fund to federal, state or other
governmental agencies; the cost and expense of engraving or printing
certificates representing shares of the Fund; all costs and expenses in
connection with the registration and maintenance of registration of the Fund and
its shares with the Securities and Exchange Commission and various states and
other jurisdictions (including filing fees and legal fees and disbursements of
counsel); the cost and expense of printing, including typesetting, and
distributing prospectuses and statements of additional information of the Fund
and supplements thereto to the Fund's shareholders; all expenses of
shareholders' and Trustees' meetings and of preparing, printing and mailing
proxy statements and reports to shareholders; fees and travel expenses of
Trustees or members of any advisory board or committee who are not employees of
the Investment Manager or any corporate affiliate of the Investment Manager; all
expenses incident to the payment of any dividend, distribution, withdrawal or
redemption, whether in shares or in cash; charges and expenses of any outside
service used for pricing of the Fund's shares; charges and expenses of legal
counsel, including counsel to the Trustees of the Fund who are not interested
persons (as defined in the Act) of the Fund or the Investment Manager, and of
independent accountants, in connection with any matter relating to the Fund;
membership dues of industry associations; interest payable on Fund borrowings;
postage; insurance premiums on property or personnel (including officers and
Trustees) of the Fund which inure to its benefit; extraordinary expenses
(including but not limited to legal claims and liabilities and litigation costs
and any indemnification related thereto); and all other charges and costs of the
Fund's operation unless otherwise explicitly provided herein.
 
     6. For the services to be rendered, the facilities furnished, and the
expenses assumed by the Investment Manager, the Fund shall pay to the Investment
Manager monthly compensation determined by applying the following annual rates
to the Fund's daily net assets: 0.50% of daily net assets up to $1 billion;
0.475% of the next $500 million; 0.450% of the next $500 million; 0.425% of the
next $500 million; 0.40% of the next $2.5 billion; 0.375% of the next $2.5
billion; 0.350% of the next $2.5 billion; 0.325% of the next $2.5 billion; and
0.30% of daily net assets over $12.5 billion. Except as hereinafter set forth,
compensation under this Agreement shall be calculated and accrued daily and the
amounts of the daily accruals shall be paid monthly. Such calculations shall be
made by applying 1/365ths of the annual rates to the Fund's net assets each day
determined as of the close of business on that day or the last previous business
day. If this Agreement becomes effective subsequent to the first day of a month
or shall terminate before the last day of a month, compensation for that part of
the month this Agreement is in effect shall be prorated in a manner consistent
with the calculation of the fees as set forth above.
 
    Subject to the provisions of paragraph 7 hereof, payment of the Investment
Manager's compensation for the preceding month shall be made as promptly as
possible after completion of the computations contemplated by paragraph 7
hereof.
 
     7. In the event the operating expenses of the Fund, including amounts
payable to the Investment Manager pursuant to paragraph 6 hereof, for any fiscal
year ending on a date on which this Agreement is in effect, exceed the expense
limitations applicable to the Fund imposed by state securities laws or
regulations thereunder, as such limitations may be raised or lowered from time
to time, the Investment Manager shall reduce its management fee to the extent of
such excess and, if required, pursuant to any such laws or regulations, will
reimburse the Fund for annual operating expenses in excess of any expense
limitation that may be applicable; provided, however, there shall be excluded
from such expenses the amount of any interest, taxes, brokerage commissions,
distribution fees and extraordinary expenses (including but not limited to legal
claims and liabilities and litigation costs and any indemnification related
thereto) paid or
 
                                       2
<PAGE>
payable by the Fund. Such reduction, if any, shall be computed and accrued
daily, shall be settled on a monthly basis, and shall be based upon the expense
limitation applicable to the Fund as at the end of the last business day of the
month. Should two or more such expense limitations be applicable as at the end
of the last business day of the month, that expense limitation which results in
the largest reduction in the Investment Manager's fee shall be applicable.
 
    For purposes of this provision, should any applicable expense limitation be
based upon the gross income of the Fund, such gross income shall include, but
not be limited to, interest on debt securities in the Fund's portfolio accrued
to and including the last day of the Fund's fiscal year, and dividends declared
on equity securities in the Fund's portfolio, the record dates for which fall on
or prior to the last day of such fiscal year, but shall not include gains from
the sale of securities.
 
     8. The Investment Manager will use its best efforts in the supervision and
management of the investment activities of the Fund, but in the absence of
willful misfeasance, bad faith, gross negligence or reckless disregard of its
obligations hereunder, the Investment Manager shall not be liable to the Fund or
any of its investors for any error of judgment or mistake of law or for any act
or omission by the Investment Manager or for any losses sustained by the Fund or
its investors.
 
     9. Nothing contained in this Agreement shall prevent the Investment Manager
or any affiliated person of the Investment Manager from acting as investment
adviser or manager for any other person, firm or corporation and shall not in
any way bind or restrict the Investment Manager or any such affiliated person
from buying, selling or trading any securities or commodities for their own
accounts or for the account of others for whom they may be acting. Nothing in
this Agreement shall limit or restrict the right of any Trustee, officer or
employee of the Investment Manager to engage in any other business or to devote
his or her time and attention in part to the management or other aspects of any
other business whether of a similar or dissimilar nature.
 
    10. This Agreement shall remain in effect until April 30, 1999 and from year
to year thereafter provided such continuance is approved at least annually by
the vote of holders of a majority, as defined in the Investment Company Act of
1940, as amended (the "Act"), of the outstanding voting securities of the Fund
or by the Trustees of the Fund; provided that in either event such continuance
is also approved annually by the vote of a majority of the Trustees of the Fund
who are not parties to this Agreement or "interested persons" (as defined in the
Act) of any such party, which vote must be cast in person at a meeting called
for the purpose of voting on such approval; provided, however, that (a) the Fund
may, at any time and without the payment of any penalty, terminate this
Agreement upon thirty days' written notice to the Investment Manager, either by
majority vote of the Trustees of the Fund or by the vote of a majority of the
outstanding voting securities of the Fund; (b) this Agreement shall immediately
terminate in the event of its assignment (to the extent required by the Act and
the rules thereunder) unless such automatic terminations shall be prevented by
an exemptive order of the Securities and Exchange Commission; and (c) the
Investment Manager may terminate this Agreement without payment of penalty on
thirty days' written notice to the Fund. Any notice under this Agreement shall
be given in writing, addressed and delivered, or mailed post-paid, to the other
party at the principal office of such party.
 
    11. This Agreement may be amended by the parties without the vote or consent
of the shareholders of the Fund to supply any omission, to cure, correct or
supplement any ambiguous, defective or inconsistent provision hereof, or if they
deem it necessary to conform this Agreement to the requirements of applicable
federal laws or regulations, but neither the Fund nor the Investment Manager
shall be liable for failing to do so.
 
    12. This Agreement shall be construed in accordance with the laws of the
State of New York and the applicable provisions of the Act. To the extent the
applicable law of the State of New York, or any of the provisions herein,
conflicts with the applicable provisions of the Act, the latter shall control.
 
    13. The Investment Manager and the Fund each agree that the name "Dean
Witter," which comprises a component of the Fund's name, is a property right of
Dean Witter Reynolds Inc. The Fund agrees and consents that (i) it will only use
the name "Dean Witter" as a component of its name and for no other purpose, (ii)
it will not purport to grant to any third party the right to use the name "Dean
Witter" for any
 
                                       3
<PAGE>
purpose, (iii) the Investment Manager or its parent, Morgan Stanley, Dean
Witter, Discover & Co., or any corporate affiliate of the Investment Manager's
parent, may use or grant to others the right to use the name "Dean Witter," or
any combination or abbreviation thereof, as all or a portion of a corporate or
business name or for any commercial purpose, including a grant of such right to
any other investment company, (iv) at the request of the Investment Manager or
its parent, the Fund will take such action as may be required to provide its
consent to the use of the name "Dean Witter," or any combination or abbreviation
thereof, by the Investment Manager or its parent or any corporate affiliate of
the Investment Manager's parent, or by any person to whom the Investment Manager
or its parent or any corporate affiliate of the Investment Manager's parent
shall have granted the right to such use, and (v) upon the termination of any
investment advisory agreement into which the Investment Manager and the Fund may
enter, or upon termination of affiliation of the Investment Manager with its
parent, the Fund shall, upon request by the Investment Manager or its parent,
cease to use the name "Dean Witter" as a component of its name, and shall not
use the name, or any combination or abbreviation thereof, as a part of its name
or for any other commercial purpose, and shall cause its officers, Trustees and
shareholders to take any and all actions which the Investment Manager or its
parent may request to effect the foregoing and to reconvey to the Investment
Manager or its parent any and all rights to such name.
 
    14. The Declaration of Trust establishing Dean Witter U.S. Government
Securities Trust, dated September 29, 1983, a copy of which, together with all
amendments thereto (the "Declaration"), is on file in the office of the
Secretary of the Commonwealth of Massachusetts, provides that the name Dean
Witter U.S. Government Securities 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 Securities 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 Securities Trust, but the Trust Estate only shall be liable.
 
    IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement on the day and year first above written in New York, New York.
 
<TABLE>
<S>                                             <C>
                                                DEAN WITTER U.S. GOVERNMENT
                                                SECURITIES TRUST
 
                                                                   By:
                                                                   .................................................................
 
Attest:
 
 ................................................................
 
                                                                   DEAN WITTER INTERCAPITAL INC.
 
                                                                   By:
                                                                   .................................................................
 
Attest:
 
 ................................................................
</TABLE>
 
                                       4

<PAGE>
                               DEAN WITTER FUNDS
                             DISTRIBUTION AGREEMENT
 
    AGREEMENT made as of this 31st day of May, 1997 between each of the open-end
investment  companies to which Dean Witter  InterCapital Inc. acts as investment
manager, that are  listed on Schedule  A, as may  be amended from  time to  time
(each,  a "Fund"  and collectively, the  "Funds"), and  Dean Witter Distributors
Inc., a Delaware corporation (the "Distributor").
 
                              W I T N E S S E T H:
 
    WHEREAS, each Fund is registered as an open-end investment company under the
Investment Company Act of 1940,  as amended (the "1940 Act"),  and it is in  the
interest of each Fund to offer its shares for sale continuously, and
 
    WHEREAS,  each Fund and the Distributor wish to enter into an agreement with
each other with respect to the  continuous offering of each Fund's  transferable
shares, of $0.01 par value (the "Shares"), to commence on the date listed above,
in  order to promote the growth of  each Fund and facilitate the distribution of
its shares.
 
    NOW, THEREFORE, the parties agree as follows:
 
    SECTION 1.  APPOINTMENT OF THE DISTRIBUTOR.
 
    (a) Each Fund hereby appoints  the Distributor as the principal  underwriter
and  distributor of the Fund to sell Shares to the public on the terms set forth
in this Agreement and that Fund's prospectus and the Distributor hereby  accepts
such appointment and agrees to act hereunder. Each Fund, during the term of this
Agreement,  shall sell Shares  to the Distributor upon  the terms and conditions
set forth herein.
 
    (b) The Distributor  agrees to  purchase Shares,  as principal  for its  own
account,  from  each Fund  and to  sell  Shares as  principal to  investors, and
securities dealers, including Dean Witter Reynolds Inc. ("DWR"), an affiliate of
the Distributor, upon the terms described  herein and in that Fund's  prospectus
(the  "Prospectus")  and statement  of  additional information  included  in the
Fund's registration statement (the "Registration Statement") most recently filed
from time to time  with the Securities and  Exchange Commission (the "SEC")  and
effective under the Securities Act of 1933, as amended (the "1933 Act"), and the
1940 Act or as the Prospectus may be otherwise amended or supplemented and filed
with the SEC pursuant to Rule 497 under the 1933 Act.
 
    SECTION  2.   EXCLUSIVE  NATURE OF  DUTIES.   The  Distributor shall  be the
exclusive principal underwriter and  distributor of each  Fund, except that  the
exclusive  rights granted to the Distributor to  sell the Shares shall not apply
to  Shares  issued  by  each  Fund:  (i)  in  connection  with  the  merger   or
consolidation  of any other investment company  or personal holding company with
the Fund or the  acquisition by purchase or  otherwise of all (or  substantially
all)  the assets or the outstanding shares of any such company by the Fund; (ii)
pursuant to reinvestment of dividends  or capital gains distributions; or  (iii)
pursuant to the reinstatement privilege afforded redeeming shareholders.
 
    SECTION 3.  PURCHASE OF SHARES FROM EACH FUND.
 
    (a)  The Distributor shall have  the right to buy  from each Fund the Shares
needed, but  not more  than the  Shares needed  (except for  clerical errors  in
transmission),   to  fill  unconditional  orders  for  Shares  placed  with  the
Distributor by investors or securities dealers. The price which the  Distributor
shall  pay for  the Shares  so purchased from  the Fund  shall be  the net asset
value, determined as set forth in the Prospectus, used in determining the public
offering price on which such orders were based.
 
    (b) The Shares are to  be resold by the  Distributor at the public  offering
price  of Shares as set  forth in the Prospectus,  to investors or to securities
dealers, including DWR, who  have entered into  selected dealer agreements  with
the  Distributor upon  the terms  and conditions set  forth in  Section 7 hereof
("Selected Dealers").
 
                                       1
<PAGE>
    (c) Each Fund  shall have the  right to suspend  the sale of  the Shares  at
times  when  redemption is  suspended pursuant  to the  conditions set  forth in
Section (f) hereof. Each Fund shall also  have the right to suspend the sale  of
the  Shares if trading on the New York Stock Exchange shall have been suspended,
if a  banking  moratorium  shall have  been  declared  by federal  or  New  York
authorities,  or if there shall have  been some other extraordinary event which,
in the judgment of a Fund, makes it impracticable to sell its Shares.
 
    (d) Each Fund, or  any agent of  a Fund designated in  writing by the  Fund,
shall  be promptly  advised of  all purchase orders  for Shares  received by the
Distributor. Any order may be rejected by a Fund; provided, however, that a Fund
will not arbitrarily or without reasonable cause refuse to accept orders for the
purchase of Shares. The Distributor will confirm orders upon their receipt,  and
each  Fund (or its agent) upon receipt of payment therefor and instructions will
deliver share  certificates  for  such  Shares or  a  statement  confirming  the
issuance of Shares. Payment shall be made to the Fund in New York Clearing House
funds.  The Distributor agrees to cause such payment and such instructions to be
delivered promptly to the Fund (or its agent).
 
    (e) With respect to Shares sold  by any Selected Dealer, the Distributor  is
authorized to direct each Fund's transfer agent to receive instructions directly
from  the Selected  Dealer on  behalf of the  Distributor as  to registration of
Shares in the names of investors and  to confirm issuance of the Shares to  such
investors.  The Distributor is also authorized to instruct the transfer agent to
receive payment directly from the Selected Dealer on behalf of the  Distributor,
for  prompt transmittal to each  Fund's custodian, of the  purchase price of the
Shares. In such event the Distributor shall obtain from the Selected Dealer  and
maintain a record of such registration instructions and payments.
 
    SECTION 4.  REPURCHASE OR REDEMPTION OF SHARES.
 
    (a)  Any of the outstanding Shares of  a Fund may be tendered for redemption
at any time, and each Fund agrees to redeem its Shares so tendered in accordance
with the applicable provisions set forth in its Prospectus. The price to be paid
to redeem the Shares  shall be equal  to the net asset  value determined as  set
forth  in the Prospectus  less, in the case  of a Fund  whose Shares are offered
with a contingent deferred sales charge ("CDSC"), any applicable CDSC. Upon  any
redemption of Shares the Fund shall pay the total amount of the redemption price
in New York Clearing House funds in accordance with applicable provisions of the
Prospectus.
 
    (b)  In the case of  a Fund whose Shares are  offered with a front-end sales
charge, the redemption by a  Fund of any of its  Shares purchased by or  through
the Distributor will not affect the applicable front-end sales charge secured by
the  Distributor or  any Selected  Dealer in  the course  of the  original sale,
except that if any Shares are tendered for redemption within seven business days
after the date of the  confirmation of the original  purchase, the right to  the
applicable  front-end sales charge shall be forfeited by the Distributor and the
Selected Dealer which sold such Shares.
 
    (c) In the case of a Fund whose Shares are offered with a CDSC, the proceeds
of any redemption  of Shares  shall be  paid by each  Fund as  follows: (i)  any
applicable  CDSC shall be paid to the Distributor or to the Selected Dealer, or,
when applicable,  pursuant to  the  Rules of  the  Association of  the  National
Association  of Securities Dealers, Inc. ("NASD"), retained by the Fund and (ii)
the balance  shall  be paid  to  the redeeming  shareholders,  in each  case  in
accordance  with applicable  provisions of its  Prospectus in  New York Clearing
House funds. The Distributor is authorized to  direct a Fund to pay directly  to
the  Selected Dealer any CDSC payable by a Fund to the Distributor in respect of
Shares sold by the Selected Dealer to the redeeming shareholders.
 
    (d) The Distributor  is authorized,  as agent  for the  Fund, to  repurchase
Shares,  represented by a share certificate which  is delivered to any office of
the Distributor  in accordance  with  applicable provisions  set forth  in  each
Fund's Prospectus. The Distributor shall promptly transmit to the transfer agent
of  the Fund for  redemption all Shares  so delivered. The  Distributor shall be
responsible for the accuracy of instructions transmitted to the Fund's  transfer
agent in connection with all such repurchases.
 
    (e)  The Distributor  is authorized, as  agent for each  Fund, to repurchase
Shares held  in  a  shareholder's  account  with  a  Fund  for  which  no  share
certificate   has   been   issued,   upon   the   telephonic   request   of  the
 
                                       2
<PAGE>
shareholders, or at  the discretion  of the Distributor.  The Distributor  shall
promptly  transmit to the transfer  agent of the Fund,  for redemption, all such
orders for repurchase of Shares. Payment for Shares repurchased may be made by a
Fund to the  Distributor for  the account  of the  shareholder. The  Distributor
shall  be responsible for the accuracy of instructions transmitted to the Fund's
transfer agent in connection with all such repurchases.
 
    (f) Redemption of its Shares or payment by a Fund may be suspended at  times
when  the New York  Stock Exchange is  closed, when trading  on said Exchange is
restricted, when an emergency exists as a result of which disposal by a Fund  of
securities  owned by it  is not reasonably  practicable or it  is not reasonably
practicable for a  Fund fairly  to determine  the value  of its  net assets,  or
during any other period when the SEC, by order, so permits.
 
    (g)  With respect to its Shares tendered for redemption or repurchase by any
Selected Dealer on  behalf of its  customers, the Distributor  is authorized  to
instruct  the  transfer agent  of  a Fund  to  accept orders  for  redemption or
repurchase directly from the Selected Dealer on behalf of the Distributor and to
instruct the  Fund to  transmit payments  for such  redemptions and  repurchases
directly  to the Selected Dealer on behalf of the Distributor for the account of
the shareholder.  The Distributor  shall obtain  from the  Selected Dealer,  and
shall  maintain, a record of such  orders. The Distributor is further authorized
to obtain from the Fund, and shall  maintain, a record of payment made  directly
to the Selected Dealer on behalf of the Distributor.
 
    SECTION 5.  DUTIES OF THE FUND.
 
    (a)  Each Fund shall  furnish to the Distributor  copies of all information,
financial statements  and  other papers  which  the Distributor  may  reasonably
request for use in connection with the distribution of its Shares, including one
certified  copy, upon  request by the  Distributor, of  all financial statements
prepared by the Fund and examined  by independent accountants. Each Fund  shall,
at the expense of the Distributor, make available to the Distributor such number
of copies of its Prospectus as the Distributor shall reasonably request.
 
    (b)  Each Fund shall take,  from time to time,  but subject to the necessary
approval of its  shareholders, all  necessary action to  fix the  number of  its
authorized  Shares and to  register Shares under  the 1933 Act,  to the end that
there will  be  available  for sale  such  number  of Shares  as  investors  may
reasonably be expected to purchase.
 
    (c)  Each Fund  shall use  its best efforts  to pay  the filing  fees for an
appropriate number of its Shares  to be sold under  the securities laws of  such
states  as the Distributor and  the Fund may approve.  Any qualification to sell
its Shares in a state may be withheld, terminated or withdrawn by a Fund at  any
time  in its discretion.  As provided in  Section 8(c) hereof,  such filing fees
shall be paid  by the Fund.  The Distributor shall  furnish any information  and
other  material relating to its  affairs and activities as  may be required by a
Fund in connection with the sale of its Shares in any state.
 
    (d) Each  Fund  shall,  at  the expense  of  the  Distributor,  furnish,  in
reasonable  quantities upon request by the Distributor, copies of its annual and
interim reports.
 
    SECTION 6.  DUTIES OF THE DISTRIBUTOR.
 
    (a) The Distributor shall sell shares of each Fund through DWR and may  sell
shares  through other  securities dealers  and its  own Account  Executives, and
shall devote reasonable  time and  effort to promote  sales of  the Shares,  but
shall  not be obligated to  sell any specific number  of Shares. The services of
the Distributor  hereunder are  not  exclusive and  it  is understood  that  the
Distributor  may act  as principal  underwriter for  other registered investment
companies, so  long as  the  performance of  its  obligations hereunder  is  not
impaired  thereby. It is  also understood that  Selected Dealers, including DWR,
may also sell shares for other registered investment companies.
 
    (b)  Neither  the  Distributor  nor  any  Selected  Dealer  shall  give  any
information  or  make any  representations, other  than  those contained  in the
Registration  Statement  or   related  Prospectus  and   any  sales   literature
specifically approved by the appropriate Fund.
 
                                       3
<PAGE>
    (c)  The  Distributor agrees  that  it will  at  all times  comply  with the
applicable terms and limitations of the Rules of the Association of the NASD.
 
    SECTION 7.  SELECTED DEALERS AGREEMENTS.
 
    (a) The  Distributor shall  have the  right to  enter into  selected  dealer
agreements  with Selected Dealers  for the sale of  Shares. In making agreements
with Selected Dealers, the  Distributor shall act only  as principal and not  as
agent  for a Fund. Shares  sold to Selected Dealers shall  be for resale by such
dealers only at  the public  offering price set  forth in  the Prospectus.  With
respect to Funds whose Shares are offered with a front-end sales charge, in such
agreement  the  Distributor shall  have  the right  to  fix the  portion  of the
applicable front-end  sales  charge  which  may be  allocated  to  the  Selected
Dealers.
 
    (b)  Within the United  States, the Distributor shall  offer and sell Shares
only to Selected Dealers that are members in good standing of the NASD.
 
    (c) The Distributor shall adopt and  follow procedures, as approved by  each
Fund,  for the  confirmation of  sales of its  Shares to  investors and Selected
Dealers, the collection of amounts payable by investors and Selected Dealers  on
such  sales, and the cancellation of unsettled transactions, as may be necessary
to comply with the requirements of the NASD, as such requirements may from  time
to time exist.
 
    SECTION 8.  PAYMENT OF EXPENSES.
 
    (a)  Each Fund shall bear all costs and expenses of the Fund, including fees
and disbursements of legal counsel  including counsel to the  Directors/Trustees
of  each Fund who are not interested persons (as defined in the 1940 Act) of the
Fund or the  Distributor, and  independent accountants, in  connection with  the
preparation  and filing of any required Registration Statements and Prospectuses
and all  amendments  and supplements  thereto,  and the  expense  of  preparing,
printing,  mailing  and otherwise  distributing  prospectuses and  statements of
additional  information,  annual  or  interim  reports  or  proxy  materials  to
shareholders.
 
    (b)  The Distributor  shall bear all  expenses incurred by  it in connection
with its duties  and activities under  this Agreement including  the payment  to
Selected  Dealers of any sales commissions,  service fees and other expenses for
sales of a Fund's  Shares (except such expenses  as are specifically  undertaken
herein  by a  Fund) incurred  or paid  by Selected  Dealers, including  DWR. The
Distributor shall  bear  the  costs  and expenses  of  preparing,  printing  and
distributing  any  supplementary sales  literature  used by  the  Distributor or
furnished by it for use by Selected  Dealers in connection with the offering  of
the  Shares for  sale. Any expenses  of advertising incurred  in connection with
such offering will also be the  obligation of the Distributor. It is  understood
and agreed that, so long as a Fund's Plan of Distribution pursuant to Rule 12b-1
under  the  1940  Act ("Rule  12b-1  Plan")  continues in  effect,  any expenses
incurred by the Distributor hereunder may  be paid in accordance with the  terms
of such Rule 12b-1 Plan.
 
    (c)  Each Fund shall pay the filing  fees, and, if necessary or advisable in
connection therewith, bear  the cost and  expense of qualifying  each Fund as  a
broker  or dealer, in such states of the United States or other jurisdictions as
shall be  selected by  the Fund  and the  Distributor pursuant  to Section  5(c)
hereof  and the cost and  expenses payable to each  such state for continuing to
offer Shares  therein  until the  Fund  decides to  discontinue  selling  Shares
pursuant to Section 5(c) hereof.
 
    SECTION 9.  INDEMNIFICATION.
 
    (a)  Each Fund  shall indemnify and  hold harmless the  Distributor and each
person, if any, who controls the Distributor against any loss, liability, claim,
damage or expense (including the  reasonable cost of investigating or  defending
any  alleged loss,  liability, claim, damage  or expense  and reasonable counsel
fees incurred in connection therewith) arising by reason of any person acquiring
any Shares, which may be based upon the 1933 Act, or on any other statute or  at
common  law, on the ground that the Registration Statement or related Prospectus
and Statement  of Additional  Information,  as from  time  to time  amended  and
supplemented,  or  the annual  or  interim reports  to  shareholders of  a Fund,
includes an untrue statement  of a material  fact or omits  to state a  material
fact  required to be stated therein or necessary in order to make the statements
therein not misleading, unless such statement  or omission was made in  reliance
upon, and in
 
                                       4
<PAGE>
conformity with, information furnished to the Fund in connection therewith by or
on  behalf of  the Distributor; provided,  however, that  in no case  (i) is the
indemnity of a Fund in favor of the Distributor and any such controlling persons
to be deemed to protect the Distributor or any such controlling persons  thereof
against any liability to a Fund or its security holders to which the Distributor
or  any such controlling persons would otherwise be subject by reason of willful
misfeasance, bad faith or gross negligence  in the performance of its duties  or
by  reason  of  reckless disregard  of  its  obligations and  duties  under this
Agreement; or  (ii)  is  a Fund  to  be  liable under  its  indemnity  agreement
contained  in  this  paragraph  with  respect  to  any  claim  made  against the
Distributor or any such controlling persons, unless the Distributor or any  such
controlling persons, as the case may be, shall have notified the Fund in writing
within  a reasonable time after the summons  or other first legal process giving
information of  the  nature  of  the  claim shall  have  been  served  upon  the
Distributor  or  uch  controlling  persons (or  after  the  Distributor  or such
controlling persons shall have received notice of such service on any designated
agent), but failure to notify  the Fund of any such  claim shall not relieve  it
from  any liability which it may have to  the person against whom such action is
brought otherwise than on account of  its indemnity agreement contained in  this
paragraph.  Each Fund will be entitled to  participate at its own expense in the
defense, or, if it so elects, to assume the defense, of any such suit brought to
enforce any such liability,  but if a  Fund elects to  assume the defense,  such
defense  shall be  conducted by  counsel chosen  by it  and satisfactory  to the
Distributor or such controlling  person or persons,  defendant or defendants  in
the  suit. In the event the  Fund elects to assume the  defense of any such suit
and retain such counsel, the Distributor or such controlling person or  persons,
defendant  or defendants in  the suit, shall  bear the fees  and expenses of any
additional counsel retained by  them, but, in  case the Fund  does not elect  to
assume  the defense of any such suit,  it will reimburse the Distributor or such
controlling person or  persons, defendant  or defendants  in the  suit, for  the
reasonable  fees and expenses of  any counsel retained by  them. Each Fund shall
promptly notify  the  Distributor  of  the commencement  of  any  litigation  or
proceedings  against  it  or  any  of  its  officers  or  Directors/Trustees  in
connection with the issuance or sale of the Shares.
 
    (b)  (i)  The Distributor shall  indemnify and hold  harmless each Fund  and
each  of  its Directors/  Trustees and  officers  and each  person, if  any, who
controls the  Fund  against  any  loss, liability,  claim,  damage,  or  expense
described in the indemnity contained in subsection (a) of this Section, but only
with respect to statements or omissions made in reliance upon, and in conformity
with,  information  furnished  to a  Fund  in writing  by  or on  behalf  of the
Distributor for use  in connection  with the Registration  Statement or  related
Prospectus  and  Statement  of  Additional Information,  as  from  time  to time
amended, or the annual or interim reports to shareholders.
 
        (ii) The Distributor  shall indemnify  and hold harmless  each Fund  and
each  Fund's  transfer agent,  individually and  in its  capacity as  the Fund's
transfer agent, from and against any claims, damages and liabilities which arise
as a result of actions taken pursuant to instructions from, or on behalf of, the
Distributor to: (1) redeem  all or a  part of shareholder  accounts in the  Fund
pursuant  to Section 4(g) hereof and pay the proceeds to, or as directed by, the
Distributor for the account  of each shareholder whose  Shares are so  redeemed;
and  (2) register Shares in the names of investors, confirm the issuance thereof
and receive payment therefor pursuant to Section 3(e) hereof.
 
       (iii) In case any action shall be brought against a Fund or any person so
indemnified by this  Section 9(b) in  respect of which  indemnity may be  sought
against  the Distributor, the Distributor shall have the rights and duties given
to a Fund, and the Fund and each person so indemnified shall have the rights and
duties given to  the Distributor, by  the provisions of  subsection (a) of  this
Section 9.
 
    (c)  If the indemnification provided for in this Section 9 is unavailable or
insufficient to hold harmless an indemnified  party under subsection (a) or  (b)
above  in respect  of any losses,  claims, damages, liabilities  or expenses (or
actions in respect thereof)  referred to herein,  then each indemnifiying  party
shall  contribute to the amount  paid or payable by  such indemnified party as a
result of such losses, claims, damages,  liabilities or expenses (or actions  in
respect  thereof) in such  proportion as is appropriate  to reflect the relative
benefits received by a  Fund on the  one hand and the  Distributor on the  other
from  the offering of  the Shares. If,  however, the allocation  provided by the
immediately preceding sentence  is not  permitted by applicable  law, then  each
indemnifying  party  shall contribute  to such  amount paid  or payable  by such
indemnified party in
 
                                       5
<PAGE>
such proportion as is appropriate to reflect not only such relative benefits but
also the relative fault  of a Fund on  the one hand and  the Distributor on  the
other  in connection  with the  statements or  omissions which  resulted in such
losses,  claims,  damages,  liabilities  or  expenses  (or  actions  in  respect
thereof),  as well as any other  relevant equitable considerations. The relative
benefits received by a  Fund on the  one hand and the  Distributor on the  other
shall  be deemed to be in the same proportion as the total net proceeds from the
offering (before deducting  expenses) received  by the  Fund bear  to the  total
compensation  received by  the Distributor,  in each  case as  set forth  in the
Prospectus. The relative fault shall be determined by reference to, among  other
things, whether the untrue or alleged untrue statement of a material fact or the
omission  or alleged  omission to state  a material fact  relates to information
supplied by  a  Fund  or  the Distributor  and  the  parties'  relative  intent,
knowledge,  access to  information and  opportunity to  correct or  prevent such
statement or omission. Each Fund and the Distributor agree that it would not  be
just  and equitable if contribution were determined by pro rata allocation or by
any other method of  allocation which does not  take into account the  equitable
considerations  referred to above. The amount  paid or payable by an indemnified
party as a result  of the losses, claims,  damages, liabilities or expenses  (or
actions  in respect thereof)  referred to above  shall be deemed  to include any
legal or  other  expenses  reasonably  incurred by  such  indemnified  party  in
connection  with investigating or defending  any such claim. Notwithstanding the
provisions of this  subsection (c),  the Distributor  shall not  be required  to
contribute  any amount in excess of the amount by which the total price at which
the Shares distributed by it  to the public were  offered to the public  exceeds
the  amount of any damages which it has otherwise been required to pay by reason
of such untrue or alleged untrue  statement or omission or alleged omission.  No
person  guilty of  fraudulent misrepresentation  (within the  meaning of Section
11(f) of the 1933 Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.
 
    SECTION 10.   DURATION AND TERMINATION  OF THIS AGREEMENT.   This  Agreement
shall become effective with respect to a Fund as of the date first above written
and shall remain in force until April 30, 1998, and thereafter, but only so long
as  such continuance is specifically approved at least annually by (i) the Board
of Directors/Trustees  of  each Fund,  or  by the  vote  of a  majority  of  the
outstanding  voting securities of the Fund, cast in person or by proxy, and (ii)
a majority of those Directors/Trustees who are not parties to this Agreement  or
interested  persons  of  any such  party  and  who have  no  direct  or indirect
financial interest in  this Agreement  or in the  operation of  the Fund's  Rule
12b-1  Plan or  in any agreement  related thereto,  cast in person  at a meeting
called for the purpose of voting upon such approval.
 
    This Agreement may  be terminated  at any time  without the  payment of  any
penalty,   by  the  Directors/  Trustees  of  a  Fund,  by  a  majority  of  the
Directors/Trustees of a Fund who are not interested persons of the Fund and  who
have no direct or indirect financial interest in this Agreement, or by vote of a
majority  of the outstanding voting securities of a Fund, or by the Distributor,
on sixty  days'  written  notice  to  the  other  party.  This  Agreement  shall
automatically terminate in the event of its assignment.
 
    The  terms  "vote  of  a majority  of  the  outstanding  voting securities,"
"assignment" and "interested person,"  when used in  this Agreement, shall  have
the respective meanings specified in the 1940 Act.
 
    SECTION 11.  AMENDMENTS OF THIS AGREEMENT.  This Agreement may be amended by
the  parties  only  if  such  amendment  is  specifically  approved  by  (i) the
Directors/Trustees of a Fund, or by the vote of a majority of outstanding voting
securities of a Fund, and (ii) a majority of those Directors/Trustees of a  Fund
who  are not parties to  this Agreement or interested  persons of any such party
and who have no direct  or indirect financial interest  in this Agreement or  in
any Agreement related to the Fund's Rule 12b-1 Plan, cast in person at a meeting
called for the purpose of voting on such approval.
 
    SECTION  12.   ADDITIONAL FUNDS.   If  at any  time another  Fund desires to
appoint the Distributor as its principal underwriter and distributor under  this
Agreement,  it shall  notify the Distributor  in writing. If  the Distributor is
willing to serve as the Fund's principal underwriter and distributor under  this
Agreement,  it shall notify the Fund in writing, whereupon such other Fund shall
become a Fund hereunder.
 
                                       6
<PAGE>
    SECTION 13.  GOVERNING LAW.  This Agreement shall be construed in accordance
with the law of the State of New York and the applicable provisions of the  1940
Act.  To the extent the applicable  law of the State of  New York, or any of the
provisions herein, conflicts with the applicable provisions of the 1940 Act, the
latter shall control.
 
    SECTION 14.  PERSONAL LIABILITY.  With respect to any Fund that is organized
as an  unincorporated business  trust  under the  laws  of the  Commonwealth  of
Massachusetts,  its Declaration of the Trust  (each, a "Declaration") is on file
in the  office of  the  Secretary of  the  Commonwealth of  Massachusetts.  Each
Declaration  provides that the name of the Fund 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 any Fund 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 any Fund, but the Trust Estate only shall be liable.
 
    IN WITNESS  WHEREOF, the  parties hereto  have executed  and delivered  this
Agreement as of the day and year first written in New York, New York.
 
                                          ON BEHALF OF THE FUNDS SET FORTH ON
                                          SCHEDULE A, ATTACHED HERETO
 
                                          By: ..................................
 
                                          DEAN WITTER DISTRIBUTORS INC.
 
                                          By: ..................................
 
                                       7
<PAGE>
                               DEAN WITTER FUNDS
                             DISTRIBUTION AGREEMENT
                                   SCHEDULE A
                                AT MAY 31, 1997
 
<TABLE>
<S>        <C>
1)         Dean Witter American Value Fund
2)         Dean Witter Balanced Growth Fund
3)         Dean Witter Balanced Income Fund
4)         Dean Witter California Tax-Free Income Fund
5)         Dean Witter Capital Appreciation Fund
6)         Dean Witter Capital Growth Securities
7)         Dean Witter Convertible Securities Trust
8)         Dean Witter Developing Growth Securities Trust
9)         Dean Witter Diversified Income Trust
10)        Dean Witter Dividend Growth Securities Inc.
11)        Dean Witter European Growth Fund Inc.
12)        Dean Witter Federal Securities Trust
13)        Dean Witter Financial Services Trust
14)        Dean Witter Global Asset Allocation Fund
15)        Dean Witter Global Dividend Growth Securities
16)        Dean Witter Global Utilities Fund
17)        Dean Witter Health Sciences Trust
18)        Dean Witter High Yield Securities Inc.
19)        Dean Witter Income Builder Fund
20)        Dean Witter Information Fund
21)        Dean Witter Intermediate Income Securities
22)        Dean Witter International SmallCap Fund
23)        Dean Witter Japan Fund
24)        Dean Witter Managers' Select Fund
25)        Dean Witter Market Leader Trust
26)        Dean Witter Mid-Cap Growth Fund
27)        Dean Witter Natural Resource Development Securities Inc.
28)        Dean Witter New York Tax-Free Income Fund
29)        Dean Witter Pacific Growth Fund Inc.
30)        Dean Witter Precious Metals and Minerals Trust
31)        Dean Witter Special Value Fund
32)        Dean Witter Strategist Fund
33)        Dean Witter Tax-Exempt Securities Trust
34)        Dean Witter U.S. Government Securities Trust
35)        Dean Witter Utilities Fund
36)        Dean Witter Value-Added Market Series/Equity Portfolio
37)        Dean Witter World Wide Income Trust
38)        Dean Witter World Wide Investment Trust
</TABLE>
 
                                       8

<PAGE>
                               DEAN WITTER FUNDS
                             DISTRIBUTION AGREEMENT
 
    AGREEMENT made as of this 28th day of July, 1997 between each of the
open-end investment companies to which Dean Witter InterCapital Inc. acts as
investment manager, that are listed on Schedule A, as may be amended from time
to time (each, a "Fund" and collectively, the "Funds"), and Dean Witter
Distributors Inc., a Delaware corporation (the "Distributor").
 
                              W I T N E S S E T H:
 
    WHEREAS, each Fund is registered as an open-end investment company under the
Investment Company Act of 1940, as amended (the "1940 Act"), and it is in the
interest of each Fund to offer its shares for sale continuously, and
 
    WHEREAS, each Fund and the Distributor wish to enter into an agreement with
each other with respect to the continuous offering of each Fund's transferable
shares, of $0.01 par value (the "Shares"), to commence on the date listed above,
in order to promote the growth of each Fund and facilitate the distribution of
its shares.
 
    NOW, THEREFORE, the parties agree as follows:
 
    SECTION 1.  APPOINTMENT OF THE DISTRIBUTOR.
 
    (a) Each Fund hereby appoints the Distributor as the principal underwriter
and distributor of the Fund to sell Shares to the public on the terms set forth
in this Agreement and that Fund's prospectus and the Distributor hereby accepts
such appointment and agrees to act hereunder. Each Fund, during the term of this
Agreement, shall sell Shares to the Distributor upon the terms and conditions
set forth herein.
 
    (b) The Distributor agrees to purchase Shares, as principal for its own
account, from each Fund and to sell Shares as principal to investors, and
securities dealers, including Dean Witter Reynolds Inc. ("DWR"), an affiliate of
the Distributor, upon the terms described herein and in that Fund's prospectus
(the "Prospectus") and statement of additional information included in the
Fund's registration statement (the "Registration Statement") most recently filed
from time to time with the Securities and Exchange Commission (the "SEC") and
effective under the Securities Act of 1933, as amended (the "1933 Act"), and the
1940 Act or as the Prospectus may be otherwise amended or supplemented and filed
with the SEC pursuant to Rule 497 under the 1933 Act.
 
    SECTION 2.  EXCLUSIVE NATURE OF DUTIES.  The Distributor shall be the
exclusive principal underwriter and distributor of each Fund, except that the
exclusive rights granted to the Distributor to sell the Shares shall not apply
to Shares issued by each Fund: (i) in connection with the merger or
consolidation of any other investment company or personal holding company with
the Fund or the acquisition by purchase or otherwise of all (or substantially
all) the assets or the outstanding shares of any such company by the Fund; (ii)
pursuant to reinvestment of dividends or capital gains distributions; or (iii)
pursuant to the reinstatement privilege afforded redeeming shareholders.
 
    SECTION 3.  PURCHASE OF SHARES FROM EACH FUND.  The Shares are offered in
four classes (each, a "Class"), as described in the Prospectus, as amended or
supplemented from time to time.
 
    (a) The Distributor shall have the right to buy from each Fund the Shares of
the particular class needed, but not more than the Shares needed (except for
clerical errors in transmission), to fill unconditional orders for Shares of the
applicable class placed with the Distributor by investors or securities dealers.
The price which the Distributor shall pay for the Shares so purchased from the
Fund shall be the net asset value, determined as set forth in the Prospectus,
used in determining the public offering price on which such orders were based.
 
    (b) The Shares are to be resold by the Distributor at the public offering
price of Shares of the applicable class as set forth in the Prospectus, to
investors or to securities dealers, including DWR, who
 
                                       1
<PAGE>
have entered into selected dealer agreements with the Distributor upon the terms
and conditions set forth in Section 7 hereof ("Selected Dealers").
 
    (c) Each Fund shall have the right to suspend the sale of the Shares at
times when redemption is suspended pursuant to the conditions set forth in
Section 4(f) hereof. Each Fund shall also have the right to suspend the sale of
the Shares if trading on the New York Stock Exchange shall have been suspended,
if a banking moratorium shall have been declared by federal or New York
authorities, or if there shall have been some other extraordinary event which,
in the judgment of a Fund, makes it impracticable to sell its Shares.
 
    (d) Each Fund, or any agent of a Fund designated in writing by the Fund,
shall be promptly advised of all purchase orders for Shares received by the
Distributor. Any order may be rejected by a Fund; provided, however, that a Fund
will not arbitrarily or without reasonable cause refuse to accept orders for the
purchase of Shares. The Distributor will confirm orders upon their receipt, and
each Fund (or its agent) upon receipt of payment therefor and instructions will
deliver share certificates for such Shares or a statement confirming the
issuance of Shares. Payment shall be made to the Fund in New York Clearing House
funds. The Distributor agrees to cause such payment and such instructions to be
delivered promptly to the Fund (or its agent).
 
    (e) With respect to Shares sold by any Selected Dealer, the Distributor is
authorized to direct each Fund's transfer agent to receive instructions directly
from the Selected Dealer on behalf of the Distributor as to registration of
Shares in the names of investors and to confirm issuance of the Shares to such
investors. The Distributor is also authorized to instruct the transfer agent to
receive payment directly from the Selected Dealer on behalf of the Distributor,
for prompt transmittal to each Fund's custodian, of the purchase price of the
Shares. In such event the Distributor shall obtain from the Selected Dealer and
maintain a record of such registration instructions and payments.
 
    SECTION 4.  REPURCHASE OR REDEMPTION OF SHARES.
 
    (a) Any of the outstanding Shares of a Fund may be tendered for redemption
at any time, and each Fund agrees to redeem its Shares so tendered in accordance
with the applicable provisions set forth in its Prospectus. The price to be paid
to redeem the Shares shall be equal to the net asset value determined as set
forth in the Prospectus less any applicable contingent deferred sales charge
("CDSC"). Upon any redemption of Shares the Fund shall pay the total amount of
the redemption price in New York Clearing House funds in accordance with
applicable provisions of the Prospectus.
 
    (b) The redemption by a Fund of any of its Class A Shares purchased by or
through the Distributor will not affect the applicable front-end sales charge
secured by the Distributor or any Selected Dealer in the course of the original
sale, except that if any Class A Shares are tendered for redemption within seven
business days after the date of the confirmation of the original purchase, the
right to the applicable front-end sales charge shall be forfeited by the
Distributor and the Selected Dealer which sold such Shares.
 
    (c) The proceeds of any redemption of Class A, Class B or Class C Shares
shall be paid by each Fund as follows: (i) any applicable CDSC shall be paid to
the Distributor or to the Selected Dealer, or, when applicable, pursuant to the
Rules of the Association of the National Association of Securities Dealers, Inc.
("NASD"), retained by the Fund and (ii) the balance shall be paid to the
redeeming shareholders, in each case in accordance with applicable provisions of
its Prospectus in New York Clearing House funds. The Distributor is authorized
to direct a Fund to pay directly to the Selected Dealer any CDSC payable by a
Fund to the Distributor in respect of Class A, Class B, or Class C Shares sold
by the Selected Dealer to the redeeming shareholders.
 
    (d) The Distributor is authorized, as agent for the Fund, to repurchase
Shares, represented by a share certificate which is delivered to any office of
the Distributor in accordance with applicable provisions set forth in each
Fund's Prospectus. The Distributor shall promptly transmit to the transfer agent
of the Fund for redemption all Shares so delivered. The Distributor shall be
responsible for the accuracy of instructions transmitted to the Fund's transfer
agent in connection with all such repurchases.
 
                                       2
<PAGE>
    (e) The Distributor is authorized, as agent for each Fund, to repurchase
Shares held in a shareholder's account with a Fund for which no share
certificate has been issued, upon the telephonic request of the shareholders, or
at the discretion of the Distributor. The Distributor shall promptly transmit to
the transfer agent of the Fund, for redemption, all such orders for repurchase
of Shares. Payment for Shares repurchased may be made by a Fund to the
Distributor for the account of the shareholder. The Distributor shall be
responsible for the accuracy of instructions transmitted to the Fund's transfer
agent in connection with all such repurchases.
 
    (f) Redemption of its Shares or payment by a Fund may be suspended at times
when the New York Stock Exchange is closed, when trading on said Exchange is
restricted, when an emergency exists as a result of which disposal by a Fund of
securities owned by it is not reasonably practicable or it is not reasonably
practicable for a Fund fairly to determine the value of its net assets, or
during any other period when the SEC, by order, so permits.
 
    (g) With respect to its Shares tendered for redemption or repurchase by any
Selected Dealer on behalf of its customers, the Distributor is authorized to
instruct the transfer agent of a Fund to accept orders for redemption or
repurchase directly from the Selected Dealer on behalf of the Distributor and to
instruct the Fund to transmit payments for such redemptions and repurchases
directly to the Selected Dealer on behalf of the Distributor for the account of
the shareholder. The Distributor shall obtain from the Selected Dealer, and
shall maintain, a record of such orders. The Distributor is further authorized
to obtain from the Fund, and shall maintain, a record of payment made directly
to the Selected Dealer on behalf of the Distributor.
 
    SECTION 5.  DUTIES OF THE FUND.
 
    (a) Each Fund shall furnish to the Distributor copies of all information,
financial statements and other papers which the Distributor may reasonably
request for use in connection with the distribution of its Shares, including one
certified copy, upon request by the Distributor, of all financial statements
prepared by the Fund and examined by independent accountants. Each Fund shall,
at the expense of the Distributor, make available to the Distributor such number
of copies of its Prospectus as the Distributor shall reasonably request.
 
    (b) Each Fund shall take, from time to time, but subject to the necessary
approval of its shareholders, all necessary action to fix the number of its
authorized Shares and to register Shares under the 1933 Act, to the end that
there will be available for sale such number of Shares as investors may
reasonably be expected to purchase.
 
    (c) Each Fund shall use its best efforts to pay the filing fees for an
appropriate number of its Shares to be sold under the securities laws of such
states as the Distributor and the Fund may approve. Any qualification to sell
its Shares in a state may be withheld, terminated or withdrawn by a Fund at any
time in its discretion. As provided in Section 8(c) hereof, such filing fees
shall be paid by the Fund. The Distributor shall furnish any information and
other material relating to its affairs and activities as may be required by a
Fund in connection with the sale of its Shares in any state.
 
    (d) Each Fund shall, at the expense of the Distributor, furnish, in
reasonable quantities upon request by the Distributor, copies of its annual and
interim reports.
 
    SECTION 6.  DUTIES OF THE DISTRIBUTOR.
 
    (a) The Distributor shall sell shares of each Fund through DWR and may sell
shares through other securities dealers and its own Account Executives, and
shall devote reasonable time and effort to promote sales of the Shares, but
shall not be obligated to sell any specific number of Shares. The services of
the Distributor hereunder are not exclusive and it is understood that the
Distributor may act as principal underwriter for other registered investment
companies, so long as the performance of its obligations hereunder is not
impaired thereby. It is also understood that Selected Dealers, including DWR,
may also sell shares for other registered investment companies.
 
                                       3
<PAGE>
    (b) Neither the Distributor nor any Selected Dealer shall give any
information or make any representations, other than those contained in the
Registration Statement or related Prospectus and any sales literature
specifically approved by the appropriate Fund.
 
    (c) The Distributor agrees that it will at all times comply with the
applicable terms and limitations of the Rules of the Association of the NASD.
 
    SECTION 7.  SELECTED DEALERS AGREEMENTS.
 
    (a) The Distributor shall have the right to enter into selected dealer
agreements with Selected Dealers for the sale of Shares. In making agreements
with Selected Dealers, the Distributor shall act only as principal and not as
agent for a Fund. Shares sold to Selected Dealers shall be for resale by such
dealers only at the public offering price set forth in the Prospectus. With
respect to Class A Shares, in such agreement the Distributor shall have the
right to fix the portion of the applicable front-end sales charge which may be
allocated to the Selected Dealers.
 
    (b) Within the United States, the Distributor shall offer and sell Shares
only to Selected Dealers that are members in good standing of the NASD.
 
    (c) The Distributor shall adopt and follow procedures, as approved by each
Fund, for the confirmation of sales of its Shares to investors and Selected
Dealers, the collection of amounts payable by investors and Selected Dealers on
such sales, and the cancellation of unsettled transactions, as may be necessary
to comply with the requirements of the NASD, as such requirements may from time
to time exist.
 
    SECTION 8.  PAYMENT OF EXPENSES.
 
    (a) Each Fund shall bear all costs and expenses of the Fund, including fees
and disbursements of legal counsel including counsel to the Directors/Trustees
of each Fund who are not interested persons (as defined in the 1940 Act) of the
Fund or the Distributor, and independent accountants, in connection with the
preparation and filing of any required Registration Statements and Prospectuses
and all amendments and supplements thereto, and the expense of preparing,
printing, mailing and otherwise distributing prospectuses and statements of
additional information, annual or interim reports or proxy materials to
shareholders.
 
    (b) The Distributor shall bear all expenses incurred by it in connection
with its duties and activities under this Agreement including the payment to
Selected Dealers of any sales commissions, service fees and other expenses for
sales of a Fund's Shares (except such expenses as are specifically undertaken
herein by a Fund) incurred or paid by Selected Dealers, including DWR. The
Distributor shall bear the costs and expenses of preparing, printing and
distributing any supplementary sales literature used by the Distributor or
furnished by it for use by Selected Dealers in connection with the offering of
the Shares for sale. Any expenses of advertising incurred in connection with
such offering will also be the obligation of the Distributor. It is understood
and agreed that, so long as a Fund's Plan of Distribution pursuant to Rule 12b-1
under the 1940 Act ("Rule 12b-1 Plan") continues in effect, any expenses
incurred by the Distributor hereunder may be paid in accordance with the terms
of such Rule 12b-1 Plan.
 
    (c) Each Fund shall pay the filing fees, and, if necessary or advisable in
connection therewith, bear the cost and expense of qualifying each Fund as a
broker or dealer, in such states of the United States or other jurisdictions as
shall be selected by the Fund and the Distributor pursuant to Section 5(c)
hereof and the cost and expenses payable to each such state for continuing to
offer Shares therein until the Fund decides to discontinue selling Shares
pursuant to Section 5(c) hereof.
 
    SECTION 9.  INDEMNIFICATION.
 
    (a) Each Fund shall indemnify and hold harmless the Distributor and each
person, if any, who controls the Distributor against any loss, liability, claim,
damage or expense (including the reasonable cost of investigating or defending
any alleged loss, liability, claim, damage or expense and reasonable counsel
fees incurred in connection therewith) arising by reason of any person acquiring
any Shares, which may be based upon the 1933 Act, or on any other statute or at
common law, on the ground that the Registration Statement or related Prospectus
and Statement of Additional Information, as from time to time amended
 
                                       4
<PAGE>
and supplemented, or the annual or interim reports to shareholders of a Fund,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary in order to make the statements
therein not misleading, unless such statement or omission was made in reliance
upon, and in conformity with, information furnished to the Fund in connection
therewith by or on behalf of the Distributor; provided, however, that in no case
(i) is the indemnity of a Fund in favor of the Distributor and any such
controlling persons to be deemed to protect the Distributor or any such
controlling persons thereof against any liability to a Fund or its security
holders to which the Distributor or any such controlling persons would otherwise
be subject by reason of willful misfeasance, bad faith or gross negligence in
the performance of its duties or by reason of reckless disregard of its
obligations and duties under this Agreement; or (ii) is a Fund to be liable
under its indemnity agreement contained in this paragraph with respect to any
claim made against the Distributor or any such controlling persons, unless the
Distributor or any such controlling persons, as the case may be, shall have
notified the Fund in writing within a reasonable time after the summons or other
first legal process giving information of the nature of the claim shall have
been served upon the Distributor or uch controlling persons (or after the
Distributor or such controlling persons shall have received notice of such
service on any designated agent), but failure to notify the Fund of any such
claim shall not relieve it from any liability which it may have to the person
against whom such action is brought otherwise than on account of its indemnity
agreement contained in this paragraph. Each Fund will be entitled to participate
at its own expense in the defense, or, if it so elects, to assume the defense,
of any such suit brought to enforce any such liability, but if a Fund elects to
assume the defense, such defense shall be conducted by counsel chosen by it and
satisfactory to the Distributor or such controlling person or persons, defendant
or defendants in the suit. In the event the Fund elects to assume the defense of
any such suit and retain such counsel, the Distributor or such controlling
person or persons, defendant or defendants in the suit, shall bear the fees and
expenses of any additional counsel retained by them, but, in case the Fund does
not elect to assume the defense of any such suit, it will reimburse the
Distributor or such controlling person or persons, defendant or defendants in
the suit, for the reasonable fees and expenses of any counsel retained by them.
Each Fund shall promptly notify the Distributor of the commencement of any
litigation or proceedings against it or any of its officers or
Directors/Trustees in connection with the issuance or sale of the Shares.
 
    (b) (i) The Distributor shall indemnify and hold harmless each Fund and each
of its Directors/ Trustees and officers and each person, if any, who controls
the Fund against any loss, liability, claim, damage, or expense described in the
indemnity contained in subsection (a) of this Section, but only with respect to
statements or omissions made in reliance upon, and in conformity with,
information furnished to a Fund in writing by or on behalf of the Distributor
for use in connection with the Registration Statement or related Prospectus and
Statement of Additional Information, as from time to time amended, or the annual
or interim reports to shareholders.
 
        (ii) The Distributor shall indemnify and hold harmless each Fund and
each Fund's transfer agent, individually and in its capacity as the Fund's
transfer agent, from and against any claims, damages and liabilities which arise
as a result of actions taken pursuant to instructions from, or on behalf of, the
Distributor to: (1) redeem all or a part of shareholder accounts in the Fund
pursuant to Section 4(g) hereof and pay the proceeds to, or as directed by, the
Distributor for the account of each shareholder whose Shares are so redeemed;
and (2) register Shares in the names of investors, confirm the issuance thereof
and receive payment therefor pursuant to Section 3(e) hereof.
 
        (iii) In case any action shall be brought against a Fund or any person
so indemnified by this Section 9(b) in respect of which indemnity may be sought
against the Distributor, the Distributor shall have the rights and duties given
to a Fund, and the Fund and each person so indemnified shall have the rights and
duties given to the Distributor, by the provisions of subsection (a) of this
Section 9.
 
    (c) If the indemnification provided for in this Section 9 is unavailable or
insufficient to hold harmless an indemnified party under subsection (a) or (b)
above in respect of any losses, claims, damages, liabilities or expenses (or
actions in respect thereof) referred to herein, then each indemnifiying party
shall contribute to the amount paid or payable by such indemnified party as a
result of such losses, claims, damages, liabilities or expenses (or actions in
respect thereof) in such proportion as is appropriate to reflect the relative
benefits received by a Fund on the one hand and the Distributor on the other
from the
 
                                       5
<PAGE>
offering of the Shares. If, however, the allocation provided by the immediately
preceding sentence is not permitted by applicable law, then each indemnifying
party shall contribute to such amount paid or payable by such indemnified party
in such proportion as is appropriate to reflect not only such relative benefits
but also the relative fault of a Fund on the one hand and the Distributor on the
other in connection with the statements or omissions which resulted in such
losses, claims, damages, liabilities or expenses (or actions in respect
thereof), as well as any other relevant equitable considerations. The relative
benefits received by a Fund on the one hand and the Distributor on the other
shall be deemed to be in the same proportion as the total net proceeds from the
offering (before deducting expenses) received by the Fund bear to the total
compensation received by the Distributor, in each case as set forth in the
Prospectus. The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by a Fund or the Distributor and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
statement or omission. Each Fund and the Distributor agree that it would not be
just and equitable ifcontribution were determined by pro rata allocation or by
any other method of allocation which does not take into account the equitable
considerations referred to above. The amount paid or payable by an indemnified
party as a result of the losses, claims, damages, liabilities or expenses (or
actions in respect thereof) referred to above shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such claim. Notwithstanding the
provisions of this subsection (c), the Distributor shall not be required to
contribute any amount in excess of the amount by which the total price at which
the Shares distributed by it to the public were offered to the public exceeds
the amount of any damages which it has otherwise been required to pay by reason
of such untrue or alleged untrue statement or omission or alleged omission. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the 1933 Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation.
 
    SECTION 10.  DURATION AND TERMINATION OF THIS AGREEMENT.  This Agreement
shall become effective with respect to a Fund as of the date first above written
and shall remain in force until April 30, 1998, and thereafter, but only so long
as such continuance is specifically approved at least annually by (i) the Board
of Directors/Trustees of each Fund, or by the vote of a majority of the
outstanding voting securities of the Fund, cast in person or by proxy, and (ii)
a majority of those Directors/Trustees who are not parties to this Agreement or
interested persons of any such party and who have no direct or indirect
financial interest in this Agreement or in the operation of the Fund's Rule
12b-1 Plan or in any agreement related thereto, cast in person at a meeting
called for the purpose of voting upon such approval.
 
    This Agreement may be terminated at any time without the payment of any
penalty, by the Directors/ Trustees of a Fund, by a majority of the
Directors/Trustees of a Fund who are not interested persons of the Fund and who
have no direct or indirect financial interest in this Agreement, or by vote of a
majority of the outstanding voting securities of a Fund, or by the Distributor,
on sixty days' written notice to the other party. This Agreement shall
automatically terminate in the event of its assignment.
 
    The terms "vote of a majority of the outstanding voting securities,"
"assignment" and "interested person," when used in this Agreement, shall have
the respective meanings specified in the 1940 Act.
 
    SECTION 11.  AMENDMENTS OF THIS AGREEMENT.  This Agreement may be amended by
the parties only if such amendment is specifically approved by (i) the
Directors/Trustees of a Fund, or by the vote of a majority of outstanding voting
securities of a Fund, and (ii) a majority of those Directors/Trustees of a Fund
who are not parties to this Agreement or interested persons of any such party
and who have no direct or indirect financial interest in this Agreement or in
any Agreement related to the Fund's Rule 12b-1 Plan, cast in person at a meeting
called for the purpose of voting on such approval.
 
    SECTION 12.  ADDITIONAL FUNDS.  If at any time another Fund desires to
appoint the Distributor as its principal underwriter and distributor under this
Agreement, it shall notify the Distributor in writing. If the Distributor is
willing to serve as the Fund's principal underwriter and distributor under this
Agreement, it shall notify the Fund in writing, whereupon such other Fund shall
become a Fund hereunder.
 
    SECTION 13.  GOVERNING LAW.  This Agreement shall be construed in accordance
with the law of the State of New York and the applicable provisions of the 1940
Act. To the extent the applicable law of the
 
                                       6
<PAGE>
State of New York, or any of the provisions herein, conflicts with the
applicable provisions of the 1940 Act, the latter shall control.
 
    SECTION 14.  PERSONAL LIABILITY.  With respect to any Fund that is organized
as an unincorporated business trust under the laws of the Commonwealth of
Massachusetts, its Declaration of the Trust (each, a "Declaration") is on file
in the office of the Secretary of the Commonwealth of Massachusetts. Each
Declaration provides that the name of the Fund 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 any Fund 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 any Fund, but the Trust Estate only shall be liable.
 
    IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the day and year first written in New York, New York.
 
                                          ON BEHALF OF THE FUNDS SET FORTH ON
                                          SCHEDULE A, ATTACHED HERETO
 
                                          By: ..................................
 
                                          DEAN WITTER DISTRIBUTORS INC.
 
                                          By: ..................................
 
                                       7
<PAGE>
                               DEAN WITTER FUNDS
                             DISTRIBUTION AGREEMENT
                                   SCHEDULE A
                                AT JULY 28, 1997
 
<TABLE>
<S>        <C>
1)         Dean Witter American Value Fund
2)         Dean Witter Balanced Growth Fund
3)         Dean Witter Balanced Income Fund
4)         Dean Witter California Tax-Free Income Fund
5)         Dean Witter Capital Appreciation Fund
6)         Dean Witter Capital Growth Securities
7)         Dean Witter Convertible Securities Trust
8)         Dean Witter Developing Growth Securities Trust
9)         Dean Witter Diversified Income Trust
10)        Dean Witter Dividend Growth Securities Inc.
11)        Dean Witter European Growth Fund Inc.
12)        Dean Witter Federal Securities Trust
13)        Dean Witter Financial Services Trust
14)        Dean Witter Global Asset Allocation Fund
15)        Dean Witter Global Dividend Growth Securities
16)        Dean Witter Global Utilities Fund
17)        Dean Witter Health Sciences Trust
18)        Dean Witter High Yield Securities Inc.
19)        Dean Witter Income Builder Fund
20)        Dean Witter Information Fund
21)        Dean Witter Intermediate Income Securities
22)        Dean Witter International SmallCap Fund
23)        Dean Witter Japan Fund
24)        Dean Witter Managers' Select Fund
25)        Dean Witter Market Leader Trust
26)        Dean Witter Mid-Cap Growth Fund
27)        Dean Witter Natural Resource Development Securities Inc.
28)        Dean Witter New York Tax-Free Income Fund
29)        Dean Witter Pacific Growth Fund Inc.
30)        Dean Witter Precious Metals and Minerals Trust
31)        Dean Witter Special Value Fund
32)        Dean Witter Strategist Fund
33)        Dean Witter Tax-Exempt Securities Trust
34)        Dean Witter U.S. Government Securities Trust
35)        Dean Witter Utilities Fund
36)        Dean Witter Value-Added Market Series/Equity Portfolio
37)        Dean Witter World Wide Income Trust
38)        Dean Witter World Wide Investment Trust
</TABLE>
 
                                       8

<PAGE>

CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the use in the Statement of Additional Information 
constituting part of this Post-Effective Amendment No. 15 to the registration 
statement on Form N-1A (the "Registration Statement") of our report dated 
February 18, 1997, relating to the financial statements and financial 
highlights of Dean Witter U.S. Government Securities Trust, which appears in 
such Statement of Additional Information, and to the incorporation by 
reference of our report into the Prospectus which constitutes part of this 
Registration Statement.  We also consent to the references to us under the 
headings "Experts" and "Independent Accountants" in such Statement of 
Additional Information and to the reference to us under the heading 
"Financial Highlights" in such Prospectus.

/s/ Price Waterhouse LLP

PRICE WATERHOUSE LLP
1177 Avenue of the Americas
New York, New York 10036
May 28, 1997

<PAGE>
        AMENDED AND RESTATED PLAN OF DISTRIBUTION PURSUANT TO RULE 12b-1
                                       OF
                  DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST
 
    WHEREAS, Dean Witter U.S. Government Securities Trust (the "Fund") is
engaged in business as an open-end management investment company and is
registered as such under the Investment Company Act of 1940, as amended (the
"Act"); and
 
    WHEREAS, on October 26, 1995, the Fund most recently amended and restated a
Plan of Distribution pursuant to Rule 12b-1 under the Act which had initially
been adopted on May 1, 1984, and the Trustees then determined that there was a
reasonable likelihood that adoption of the Plan of Distribution, as then amended
and restated, would benefit the Fund and its shareholders; and
 
    WHEREAS, the Trustees believe that continuation of said Plan of
Distribution, as amended and restated herein, is reasonably likely to continue
to benefit the Fund and its shareholders; and
 
    WHEREAS, on May 1, 1984, the Fund and Dean Witter Reynolds Inc. ("DWR")
entered into a Distribution Agreement pursuant to which the Fund employed DWR as
distributor of the Fund's shares; and
 
    WHEREAS, on January 4, 1993, the Fund and DWR substituted Dean Witter
Distributors Inc. (the "Distributor") in the place of DWR as distributor of the
Fund's shares; and
 
    WHEREAS, the Fund, DWR and the Distributor intend that DWR will continue to
promote the sale of Fund shares and provide personal services to Fund
shareholders with respect to their holdings of Fund shares; and
 
    WHEREAS, the Fund and the Distributor entered into a separate Distribution
Agreement dated as of July 28, 1997 (which superseded a Distribution Agreement
dated May 31, 1997, which Agreement in turn superseded an Agreement dated June
30, 1993), pursuant to which the Fund has employed the Distributor in such
capacity during the continuous offering of shares of the Fund.
 
    NOW, THEREFORE, the Fund hereby amends the Plan of Distribution previously
adopted and amended and restated, and the Distributor hereby agrees to the terms
of said Plan of Distribution (the "Plan"), as amended herein, in accordance with
Rule 12b-1 under the Act on the following terms and conditions with respect to
the Class A, Class B and Class C shares of the Fund:
 
    1(a)(i). With respect to Class A and Class C shares of the Fund, the
Distributor hereby undertakes to directly bear all costs of rendering the
services to be performed by it under this Plan and under the Distribution
Agreement, except for those specific expenses that the Trustees determine to
reimburse as hereinafter set forth.
 
    1(a)(ii). The Fund is hereby authorized to reimburse the Distributor, DWR,
its affiliates and other broker-dealers for distribution expenses incurred by
them specifically on behalf of Class A and Class C shares of the Fund.
Reimbursement will be made through payments at the end of each month. The amount
of each monthly payment may in no event exceed an amount equal to a payment at
the annual rate of 0.25%, in the case of Class A, and 0.75%, in the case of
Class C, of the average net assets of the respective Class during the month.
With respect to Class A, in the case of all expenses other than expenses
representing the service fee and, with respect to Class C, in the case of all
expenses other than expenses representing a gross sales credit or a residual to
account executives, such amounts shall be determined at the beginning of each
calendar quarter by the Trustees, including a majority of the Trustees who are
not "interested persons" of the Fund, as defined in the Act. Expenses
representing the service fee (for Class A) or a gross sales credit or a residual
to account executives (for Class C) may be reimbursed without prior
determination. In the event that the Distributor proposes that monies shall be
reimbursed for other than such expenses, then in making the quarterly
determinations of the amounts that may be expended by the Fund, the Distributor
shall provide, and the Trustees shall review, a quarterly budget of projected
distribution expenses to be incurred by the Distributor, DWR, its affiliates or
other broker-dealers on behalf of the Fund together with a report explaining the
purposes and anticipated benefits of incurring such expenses. The Trustees shall
determine the particular expenses, and the portion thereof that may be
<PAGE>
borne by the Fund, and in making such determination shall consider the scope of
the Distributor's commitment to promoting the distribution of the Fund's Class A
and Class C shares directly or through DWR, its affiliates or other
broker-dealers.
 
    1(a)(iii). If, as of the end of any calendar year, the actual expenses
incurred by the Distributor, DWR, its affiliates and other broker-dealers on
behalf of Class A or Class C shares of the Fund (including accrued expenses and
amounts reserved for incentive compensation and bonuses) are less than the
amount of payments made by such Class pursuant to this Plan, the Distributor
shall promptly make appropriate reimbursement to the appropriate Class. If,
however, as of the end of any calendar year, the actual expenses (other than
expenses representing a gross sales credit) of the Distributor, DWR, its
affiliates and other broker-dealers are greater than the amount of payments made
by Class A or Class C shares of the Fund pursuant to this Plan, such Class will
not reimburse the Distributor, DWR, its affiliates or other broker-dealers for
such expenses through payments accrued pursuant to this Plan in the subsequent
fiscal year. Expenses representing a gross sales credit may be reimbursed in the
subsequent calendar year.
 
    1(b). With respect to Class B shares of the Fund, the Fund shall pay to the
Distributor, as the distributor of securities of which the Fund is the issuer,
compensation for distribution of its Class B shares at the rate of the lesser of
(i) 0.75% (0.65% on amounts over $10 billion) per annum of the average daily
aggregate sales of the Fund's Class B shares since the Fund's inception (not
including reinvestment of dividends and capital gains distributions from the
Fund) less the average daily aggregate net asset value of the Fund's Class B
shares redeemed since the Fund's inception upon which a contingent deferred
sales charge has been imposed or upon which such charge has been waived, or (ii)
0.75% (0.65% on amounts over $10 billion) per annum of the average daily net
assets of Class B. Such compensation shall be calculated and accrued daily and
paid monthly or at such other intervals as the Trustees shall determine.
 
    The Distributor may direct that all or any part of the amounts receivable by
it under this Plan be paid directly to DWR, its affiliates or other
broker-dealers who provide distribution and shareholder services. All payments
made hereunder pursuant to the Plan shall be in accordance with the terms and
limitations of the Rules of the Association of the National Association of
Securities Dealers, Inc.
 
    2. With respect to expenses incurred by each Class, the amount set forth in
paragraph 1 of this Plan shall be paid for services of the Distributor, DWR, its
affiliates and other broker-dealers it may select in connection with the
distribution of the Fund's shares, including personal services to shareholders
with respect to their holdings of Fund shares, and may be spend by the
Distributor, DWR, its affiliates and such broker-dealers on any activities or
expenses related to the distribution of the Fund's shares or services to
shareholders, including, but not limited to: compensation to, and expenses of,
account executives or other employees of the Distributor, DWR, its affiliates or
other broker-dealers; overhead and other branch office distribution-related
expenses and telephone expenses of persons who engage in or support distribution
of shares or who provide personal services to shareholders; printing of
prospectuses and reports for other than existing shareholders; preparation,
printing and distribution of sales literature and advertising materials and,
with respect to Class B, opportunity costs in incurring the foregoing expenses
(which may be calculated as a carrying charge on the excess of the distribution
expenses incurred by the Distributor, DWR, its affiliates or other
broker-dealers over distribution revenues received by them, such excess being
hereinafter referred to as "carryover expenses"). The overhead and other branch
office distribution-related expenses referred to in this paragraph 2 may
include: (a) the expenses operating the branch offices of the Distributor or
other broker-dealers, including DWR, in connection with the sale of the Fund
shares, including lease costs, the salaries and employee benefits of operations
and sales support personnel, utility costs, communications costs and the costs
of stationery and supplies; (b) the costs of client sales seminars; (c) travel
expenses of mutual fund sales coordinators to promote the sale of Fund shares;
and (d) other expenses relating to branch promotion of Fund sales. Payments may
also be made with respect to distribution expenses incurred in connection with
the distribution of shares, including personal services to shareholders with
respect to holdings of such shares, of an investment company whose assets are
acquired by the Fund in a tax-free reorganization, provided that, with respect
to Class B, carryover expenses as a
 
                                       2
<PAGE>
percentage of Fund assets will not be materially increased thereby. It is
contemplated that, with respect to Class A shares, the entire fee set forth in
paragraph 1(a) will be characterized as a service fee within the meaning of the
National Association of Securities Dealers, Inc. guidelines and that, with
respect to Class B shares, payments at the annual rate of 0.20% will be so
characterized and that, with respect to Class C shares, payments at the annual
rate of 0.25% will be so characterized.
 
    3. This Plan, as amended and restated, shall not take effect with respect to
any particular Class until it has been approved, together with any related
agreements, by votes of a majority of the Board of Trustees of the Fund and of
the Trustees who are not "interested persons" of the Fund (as defined in the
Act) and have no direct financial interest in the operation of this Plan or any
agreements related to it (the "Rule 12b-1 Trustees"), cast in person at a
meeting (or meetings) called for the purpose of voting on this Plan and such
related agreements.
 
    4. This Plan shall continue in effect with respect to each Class until April
30, 1998, and from year to year thereafter, provided such continuance is
specifically approved at least annually in the manner provided for approval of
this Plan in paragraph 3 hereof.
 
    5. The Distributor shall provide to the Trustees of the Fund and the
Trustees shall review, at least quarterly, a written report of the amounts so
expended and the purposes for which such expenditures were made. In this regard,
the Trustees shall request the Distributor to specify such items of expenses as
the Trustees deem appropriate. The Trustees shall consider such items as they
deem relevant in making the determinations required by paragraph 4 hereof.
 
    6. This Plan may be terminated at any time with respect to a Class by vote
of a majority of the Rule 12b-1 Trustees, or by vote of a majority of the
outstanding voting securities of the Fund. The Plan may remain in effect with
the respect to a particular Class even if the Plan has been terminated in
accordance with this paragraph 6 with respect to any other Class. In the event
of any such termination or in the event of nonrenewal, the Fund shall have no
obligation to pay expenses which have been incurred by the Distributor, DWR, its
affiliates or other broker-dealers in excess of payments made by the Fund
pursuant to this Plan. However, with respect to Class B, this shall not preclude
consideration by the Trustees of the manner in which such excess expenses shall
be treated.
 
    7. This Plan may not be amended with respect to any Class to increase
materially the amount each Class may spend for distribution provided in
paragraph 1 hereof unless such amendment is approved by a vote of at least a
majority (as defined in the Act) of the outstanding voting securities of that
Class, and no material amendment to the Plan shall be made unless approved in
the manner provided for approval in paragraph 3 hereof. Class B shares will have
the right to vote on any material increase in the fee set forth in paragraph
1(a) above affecting Class A shares.
 
    8. While this Plan is in effect, the selection and nomination of Trustees
who are not interested persons (as defined in the Act) of the Fund shall be
committed to the discretion of the Trustees who are not interested persons.
 
    9. The Fund shall preserve copies of this Plan and any related agreements
and all reports made pursuant to paragraph 5 hereof, for a period of not less
than six years from the date of this Plan, any such agreement or any such
report, as the case may be, the first two years in an easily accessible place.
 
    10. The Declaration of Trust establishing Dean Witter U.S. Government
Securities Trust, dated September 29, 1983, a copy of which, together with all
amendments thereto (the "Declaration"), is on file in the office of the
Secretary of the Commonwealth of Massachusetts, provides that the name Dean
Witter U.S. Government Securities 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 Securities Trust shall be held to any personal liability, nor shall
resort be had to their private property for this satisfaction of any obligation
or claim or otherwise, in connection with the affairs of said Dean Witter U.S.
Government Securities Trust, but the Trust Estate only shall be liable.
 
                                       3
<PAGE>
    IN WITNESS WHEREOF, the Fund, the Distributor and DWR have executed this
amended and restated Plan of Distribution as of the day and year set forth below
in New York, New York.
 
Date:  May 1, 1984
     As Amended on April 29, 1988,
     January 4, 1993, April 28, 1993,
     October 26, 1995 and July 28, 1997
 
<TABLE>
<S>                                            <C>
Attest:                                        DEAN WITTER U.S. GOVERNMENT
                                               SECURITIES TRUST
 
 ................................................................  By:  ...........................................................
 
Attest:                                                           DEAN WITTER DISTRIBUTORS INC.
 
 ................................................................  By:  ...........................................................
 
Attest:                                                           DEAN WITTER REYNOLDS INC.
 
 ................................................................  By:  ...........................................................
</TABLE>
 
                                       4

<PAGE>
                               DEAN WITTER FUNDS
                              MULTIPLE CLASS PLAN
                             PURSUANT TO RULE 18f-3
 
INTRODUCTION
 
    This plan (the "Plan") is adopted pursuant to Rule 18f-3(d) of the
Investment Company Act of 1940, as amended (the "1940 Act"), and will be
effective as of July 28, 1997. The Plan relates to shares of the open-end
investment companies to which Dean Witter InterCapital Inc. acts as investment
manager, that are listed on Schedule A, as may be amended from time to time
(each, a "Fund" and collectively, the "Funds"). The Funds are distributed
pursuant to a system (the "Multiple Class System") in which each class of shares
(each, a "Class" and collectively, the "Classes") of a Fund represents a pro
rata interest in the same portfolio of investments of the Fund and differs only
to the extent outlined below.
 
I.  DISTRIBUTION ARRANGEMENTS
 
    One or more Classes of shares of the Funds are offered for purchase by
investors with the sales load structures described below. In addition, pursuant
to Rule 12b-1 under the 1940 Act, the Funds have each adopted a Plan of
Distribution (the "12b-1 Plan") under which shares of certain Classes are
subject to the service and/or distribution fees ("12b-1 fees") described below.
 
    1.  CLASS A SHARES
 
    Class A shares are offered with a front-end sales load ("FESL"). The
schedule of sales charges applicable to a Fund and the circumstances under which
the sales charges are subject to reduction are set forth in each Fund's current
prospectus. As stated in each Fund's current prospectus, Class A shares may be
purchased at net asset value (without a FESL): (i) in the case of certain large
purchases of such shares; and (ii) by certain limited categories of investors,
in each case, under the circumstances and conditions set forth in each Fund's
current prospectus. Class A shares purchased at net asset value may be subject
to a contingent deferred sales charge ("CDSC") on redemptions made within one
year of purchase. Further information relating to the CDSC, including the manner
in which it is calculated, is set forth in paragraph 6 below. Class A shares are
also subject to payments under each Fund's 12b-1 Plan to reimburse Dean Witter
Distributors Inc., Dean Witter Reynolds Inc. ("DWR"), its affiliates and other
broker-dealers for distribution expenses incurred by them specifically on behalf
of the Class, assessed at an annual rate of up to 0.25% of average daily net
assets. The entire amount of the 12b-1 fee represents a service fee within the
meaning of National Association of Securities Dealers, Inc. ("NASD") guidelines.
 
    2.  CLASS B SHARES
 
    Class B shares are offered without a FESL, but will in most cases be subject
to a six-year declining CDSC which is calculated in the manner set forth in
paragraph 6 below. Class B shares purchased by certain qualified
employer-sponsored benefit plans are subject to a three-year declining CDSC
which is calculated in the manner set forth in paragraph 6 below. The schedule
of CDSC charges applicable to each Fund is set forth in each Fund's current
prospectus. With the exception of certain of the Funds which have a different
formula described below (Dean Witter American Value Fund, Dean Witter Natural
Resource Development Securities Inc., Dean Witter Strategist Fund and Dean
Witter Dividend Growth Securities Inc.)(1), Class B
 
- ------------
 
(1)The payments under the 12b-1 Plan for each of Dean Witter American Value
Fund, Dean Witter Natural Resource Development Securities Inc. and Dean Witter
Dividend Growth Securities Inc. are assessed at the annual rate of 1.0% of the
lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the Fund's Plan (not including reinvestment of
dividends or capital gains distributions), less the average daily aggregate net
asset value of the Fund's Class B shares redeemed since the Plan's inception
upon which a contingent deferred sales charge has been imposed or waived, or (b)
the average daily net assets of Class B attributable to shares issued, net of
related shares redeemed, since inception of the Plan. The payments under the
12b-1 Plan for the Dean Witter Strategist Fund are assessed at the annual rate
of: (i) 1% of the lesser of (a) the average daily aggregate gross sales of the
Fund's Class B shares since the effectiveness of the first amendment of the Plan
on November 8, 1989 (not including reinvestment of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the effectiveness of the first amended Plan, upon
which a contingent deferred sales charge has been imposed or waived, or (b) the
average daily net assets of Class B attributable to shares issued, net of
related shares redeemed, since the effectiveness of the first amended Plan; plus
(ii) 0.25% of the average daily net assets of Class B attributable to shares
issued, net of related shares redeemed, prior to effectiveness of the first
amended Plan.
 
                                       1
<PAGE>
shares are also subject to a fee under each Fund's respective 12b-1 Plan,
assessed at the annual rate of up to 1.0% of either: (a) the lesser of (i) the
average daily aggregate gross sales of the Fund's Class B shares since the
inception of the Fund (not including reinvestment of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the Fund's inception upon which a CDSC has been
imposed or waived, or (ii) the average daily net assets of Class B; or (b) the
average daily net assets of Class B. A portion of the 12b-1 fee equal to up to
0.25% of the Fund's average daily net assets is characterized as a service fee
within the meaning of the NASD guidelines and the remaining portion of the 12b-1
fee, if any, is characterized as an asset-based sales charge. Also, Class B
shares have a conversion feature ("Conversion Feature") under which such shares
convert to Class A shares after a certain holding period. Details of the
Conversion Feature are set forth in Section IV below.
 
    3.  CLASS C SHARES
 
    Class C shares are offered without imposition of a FESL, but will in most
cases be subject to a CDSC of 1.0% on redemptions made within one year after
purchase. Further information relating to the CDSC is set forth in paragraph 6
below. In addition, Class C shares, under each Fund's 12b-1 Plan, are subject to
12b-1 payments to reimburse Dean Witter Distributors Inc., DWR, its affiliates
and other broker-dealers for distribution expenses incurred by them specifically
on behalf of the Class, assessed at the annual rate of up to 1.0% of the average
daily net assets of the Class. A portion of the 12b-1 fee equal to up to 0.25%
of the Fund's average daily net assets is characterized as a service fee within
the meaning of NASD guidelines. Unlike Class B shares, Class C shares do not
have the Conversion Feature.
 
    4.  CLASS D SHARES
 
    Class D shares are offered without imposition of a FESL, CDSC or a 12b-1 fee
for purchases of Fund shares by (i) investors meeting an initial minimum
investment requirement and (ii) certain other limited categories of investors,
in each case, as may be approved by the Boards of Directors/Trustees of the
Funds and as disclosed in each Fund's current prospectus.
 
    5.  ADDITIONAL CLASSES OF SHARES
 
    The Boards of Directors/Trustees of the Funds have the authority to create
additional Classes, or change existing Classes, from time to time, in accordance
with Rule 18f-3 under the 1940 Act.
 
    6.  CALCULATION OF THE CDSC
 
    Any applicable CDSC is calculated based upon the lesser of net asset value
of the shares at the time of purchase or at the time of redemption. The CDSC
does not apply to amounts representing an increase in share value due to capital
appreciation and shares acquired through the reinvestment of dividends or
capital gains distributions. The CDSC schedule applicable to a Fund and the
circumstances in which the CDSC is subject to waiver are set forth in each
Fund's prospectus.
 
II.  EXPENSE ALLOCATIONS
 
    Expenses incurred by a Fund are allocated among the various Classes of
shares pro rata based on the net assets of the Fund attributable to each Class,
except that 12b-1 fees relating to a particular Class are allocated directly to
that Class. In addition, other expenses associated with a particular Class
(except advisory or custodial fees), may be allocated directly to that Class,
provided that such expenses are reasonably identified as specifically
attributable to that Class and the direct allocation to that Class is approved
by the Fund's Board of Directors/Trustees.
 
III.  CLASS DESIGNATION
 
    All shares of the Funds held prior to July 28, 1997 (other than the shares
held by certain employee benefit plans established by DWR and its affiliate, SPS
Transaction Services, Inc., shares of Funds offered with a FESL, and shares of
Dean Witter Balanced Growth Fund and Dean Witter Balanced Income Fund) have been
designated Class B shares. Shares held prior to July 28, 1997 by such employee
benefit plans have been designated Class D shares. Shares held prior to July 28,
1997 of Funds offered with a FESL have been designated Class D shares. In
addition, shares of Dean Witter American Value Fund purchased prior to April 30,
1984, shares of Dean Witter Strategist Fund purchased prior to November 8, 1989
and shares of Dean Witter Natural Resource Development Securities Inc. and Dean
Witter Dividend Growth Securities Inc. purchased prior to July 2, 1984 (with
respect to such shares of each Fund, including such proportion of shares
acquired through reinvestment of dividends and capital gains distributions as
the total number of shares acquired prior to each of the preceding dates in this
sentence bears to the total number of shares purchased and owned by the
shareholder of that Fund) have been designated Class D shares. Shares of Dean
Witter Balanced Growth Fund and Dean Witter Balanced Income Fund held prior to
July 28, 1997 have
 
                                       2
<PAGE>
been designated Class C shares except that shares of Dean Witter Balanced Growth
Fund and Dean Witter Balanced Income Fund held prior to July 28, 1997 that were
acquired in exchange for shares of a Fund offered with a CDSC have been
designated Class B shares and those that were acquired in exchange for shares of
a Fund offered with a FESL have been designated Class A shares.
 
IV.  THE CONVERSION FEATURE
 
    Class B shares held before May 1, 1997 will convert to Class A shares in
May, 2007, except that Class B shares which are purchased before July 28, 1997
by trusts for which Dean Witter Trust Company ("DWTC") or Dean Witter Trust FSB
("DWTFSB") provides discretionary trustee services will convert to Class A
shares on or about August 29, 1997 (the CDSC will not be applicable to such
shares upon the conversion). In all other instances, Class B shares of each Fund
will automatically convert to Class A shares, based on the relative net asset
values of the shares of the two Classes on the conversion date, which will be
approximately ten (10) years after the date of the original purchase.
Conversions will be effected once a month. The 10 year period will be calculated
from the last day of the month in which the shares were purchased or, in the
case of Class B shares acquired through an exchange or a series of exchanges,
from the last day of the month in which the original Class B shares were
purchased, provided that shares originally purchased before May 1, 1997 will
convert to Class A shares in May, 2007. Except as set forth below, the
conversion of shares purchased on or after May 1, 1997 will take place in the
month following the tenth anniversary of the purchase. There will also be
converted at that time such proportion of Class B shares acquired through
automatic reinvestment of dividends owned by the shareholder as the total number
of his or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a 401(k) plan or other employer-sponsored plan
qualified under Section 401(a) of the Internal Revenue Code (the "Code") and for
which DWTC or DWTFSB serves as Trustee or the 401(k) Support Services Group of
DWR serves as recordkeeper, all Class B shares will convert to Class A shares on
the conversion date of the first shares of a Fund purchased by that plan. In the
case of Class B shares previously exchanged for shares of an "Exchange Fund" (as
such term is defined in the prospectus of each Fund), the period of time the
shares were held in the Exchange Fund (calculated from the last day of the month
in which the Exchange Fund shares were acquired) is excluded from the holding
period for conversion. If those shares are subsequently re-exchanged for Class B
shares of a Fund, the holding period resumes on the last day of the month in
which Class B shares are reacquired.
 
    Effectiveness of the Conversion Feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel to the effect that (i) the conversion of shares does not constitute a
taxable event under the Code; (ii) Class A shares received on conversion will
have a basis equal to the shareholder's basis in the converted Class B shares
immediately prior to the conversion; and (iii) Class A shares received on
conversion will have a holding period that includes the holding period of the
converted Class B shares. The Conversion Feature may be suspended if the Ruling
or opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B fees under the applicable Fund's 12b-1 Plan.
 
V.  EXCHANGE PRIVILEGES
 
    Shares of each Class may be exchanged for shares of the same Class of the
other Funds without the imposition of an exchange fee as described in the
prospectuses and statements of additional information of the Funds. The exchange
privilege of each Fund may be terminated or revised at any time by the Fund upon
such notice as may be required by applicable regulatory agencies as described in
each Fund's prospectus.
 
VI.  VOTING
 
    Each Class shall have exclusive voting rights on any matter that relates
solely to its 12b-1 Plan, except that Class B shareholders will have the right
to vote on any proposed material increase in Class A's expenses, including
payments under the Class A 12b-1 Plan, if such proposal is submitted separately
to Class A shareholders. If the amount of expenses, including payments under the
Class A 12b-1 Plan, is increased materially without the approval of Class B
shareholders, the Fund will establish a new Class A for Class B shareholders
whose shares automatically convert on the same terms as applied to Class A
before the increase. In addition, each Class shall have separate voting rights
on any matter submitted to shareholders in which the interests of one Class
differ from the interests of any other Class.
 
                                       3
<PAGE>
                               DEAN WITTER FUNDS
                   MULTIPLE CLASS PLAN PURSUANT TO RULE 18f-3
                                   SCHEDULE A
                                AT JULY 28, 1997
 
<TABLE>
<S>        <C>
1)         Dean Witter American Value Fund
2)         Dean Witter Balanced Growth Fund
3)         Dean Witter Balanced Income Fund
4)         Dean Witter California Tax-Free Income Fund
5)         Dean Witter Capital Appreciation Fund
6)         Dean Witter Capital Growth Securities
7)         Dean Witter Convertible Securities Trust
8)         Dean Witter Developing Growth Securities Trust
9)         Dean Witter Diversified Income Trust
10)        Dean Witter Dividend Growth Securities Inc.
11)        Dean Witter European Growth Fund Inc.
12)        Dean Witter Federal Securities Trust
13)        Dean Witter Financial Services Trust
14)        Dean Witter Global Asset Allocation Fund
15)        Dean Witter Global Dividend Growth Securities
16)        Dean Witter Global Utilities Fund
17)        Dean Witter Health Sciences Trust
18)        Dean Witter High Yield Securities Inc.
19)        Dean Witter Income Builder Fund
20)        Dean Witter Information Fund
21)        Dean Witter Intermediate Income Securities
22)        Dean Witter International SmallCap Fund
23)        Dean Witter Japan Fund
24)        Dean Witter Managers' Select Fund
25)        Dean Witter Market Leader Trust
26)        Dean Witter Mid-Cap Growth Fund
27)        Dean Witter Natural Resource Development Securities Inc.
28)        Dean Witter New York Tax-Free Income Fund
29)        Dean Witter Pacific Growth Fund Inc.
30)        Dean Witter Precious Metals and Minerals Trust
31)        Dean Witter Special Value Fund
32)        Dean Witter Strategist Fund
33)        Dean Witter Tax-Exempt Securities Trust
34)        Dean Witter U.S. Government Securities Trust
35)        Dean Witter Utilities Fund
36)        Dean Witter Value-Added Market Series/Equity Portfolio
37)        Dean Witter World Wide Income Trust
38)        Dean Witter World Wide Investment Trust
</TABLE>
 
                                       4


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission