WITTER DEAN FEDERAL SECURITIES TRUST
485BPOS, 1997-07-17
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 17, 1997
                                                     REGISTRATION NOS.: 33-10363
                                                                        811-4917
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       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. 12                      /X/
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
                                AMENDMENT NO. 13                             /X/
                               ------------------
 
                      DEAN WITTER FEDERAL 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)
        _X_ on (July 28,1997) pursuant to paragraph (b)
        ___ 60 days after filing pursuant to paragraph (a)
        ___ on (date) pursuant to paragraph (a) of rule 485.
 
    THE REGISTRANT HAS REGISTERED AN INDEFINITE NUMBER OF ITS SHARES UNDER THE
SECURITIES ACT OF 1933 PURSUANT TO SECTION (a)(1) OF RULE 24f-2 UNDER THE
INVESTMENT COMPANY ACT OF 1940. PURSUANT TO SECTION (b)(2) OF RULE 24f-2, THE
REGISTRANT FILED A RULE 24f-2 NOTICE FOR ITS FISCAL YEAR ENDED OCTOBER 31, 1996
WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 18, 1996.
 
           AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS
 
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- --------------------------------------------------------------------------------
<PAGE>
                      DEAN WITTER FEDERAL SECURITIES TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
                     ITEM                                                        CAPTION
- -----------------------------------------------  -----------------------------------------------------------------------
<S>                                              <C>
PART A                                                                         PROSPECTUS
 1.  ..........................................  Cover Page
 2.  ..........................................  Prospectus Summary
 3.  ..........................................  Financial Highlights; Performance Information
 4.  ..........................................  Investment Objective and Policies; Financial Highlights; The Fund and
                                                  Its Management, Cover Page; Investment Restrictions; Prospectus
                                                  Summary
 5.  ..........................................  The Fund and Its Management; Back Cover; Investment Objectives and
                                                  Policies
 6.  ..........................................  Dividends, Distributions and Taxes; Additional Information
 7.  ..........................................  Purchase of Fund Shares; Shareholder Services; Prospectus Summary
 8.  ..........................................  Purchase of Fund Shares; Redemptions and Repurchases; Shareholder
                                                  Services
 9.  ..........................................  Additional Information
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.  ..........................................  Description of Shares of the Fund
19.  ..........................................  The Distributor; Purchase of Fund Shares; Redemptions and Repurchases;
                                                  Financial Statements; Shareholder Services; Determination of Net Asset
                                                  Value
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 Federal Securities Trust (the "Fund") is an open-end
diversified management investment company whose investment objective is to earn
a high level of current income. The Fund will seek to achieve its investment
objective by investing primarily in debt securities issued by the U.S.
Government, its agencies or instrumentalities, including mortgage-backed
securities, and by writing covered call and put options against such securities.
The Fund may also purchase options on such securities to effect closing
transactions. In addition, to hedge the Fund's portfolio of securities against
changes in prevailing interest rates, the Fund may purchase put options on U.S.
Government securities and engage in transactions involving interest rate futures
contracts and options on such contracts. Shares of the Fund are not issued,
insured or guaranteed, as to value or yield, by the U.S. Government, its
agencies or instrumentalities. (See "Investment Objective and Policies.")
    
 
   
               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. 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/12
Investment Restrictions/16
Purchase of Fund Shares/17
Shareholder Services/28
Redemptions and Repurchases/31
Dividends, Distributions and Taxes/32
Performance Information/33
Additional Information/34
    
 
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
    Federal 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 an
Fund              open-end diversified management investment company which invests principally in U.S. Government
                  securities.
- ----------------------------------------------------------------------------------------------------------------------
Shares Offered    Shares of beneficial interest with $0.01 par value (see page 34). The Fund offers four Classes of
                  shares, each with a different combination of sales charges, ongoing fees and other features (see
                  page 17).
- ----------------------------------------------------------------------------------------------------------------------
Minimum           The minimum initial investment for each Class is $1,000 ($100 if the account is opened through
Purchase          EasyInvest-SM-). 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 shares of funds for which Dean
                  Witter InterCapital Inc. serves as investment manager ("Dean Witter Funds") that are sold with a
                  front-end sales charge, and concurrent investments in Class D shares of the Fund and other Dean
                  Witter Funds that are multiple class funds, will be aggregated. The minimum subsequent investment is
                  $100 (see page 17).
- ----------------------------------------------------------------------------------------------------------------------
Investment        The investment objective of the Fund is to earn a high level of current income.
Objective
- ----------------------------------------------------------------------------------------------------------------------
Investment        Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund, and its wholly-
Manager           owned subsidiary, Dean Witter Services Company, Inc., serve in various investment management,
                  advisory, management and administrative capacities to 100 investment companies and other portfolios
                  with assets of approximately $96.6 billion at June 30, 1997 (see page 7).
- ----------------------------------------------------------------------------------------------------------------------
Management        The Investment Manager receives a monthly fee at the annual rate of 0.55% of the Fund's daily net
Fee               assets not exceeding $1 billion, scaled down at various asset levels to 0.35% of the Fund's daily
                  net assets on assets exceeding $12.5 billion (see page 7).
- ----------------------------------------------------------------------------------------------------------------------
Distributor and   Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution plan pursuant
Distribution Fee  to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with respect to the distribution
                  fees paid by the Class A, Class B and Class C shares of the 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 0.20% of the average daily net assets of Class B and 0.25% of the average daily net assets
                  of Class C are currently each 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 pages 17 and 26).
- ----------------------------------------------------------------------------------------------------------------------
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 and servicing shareholder accounts 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 17, 20 and 26).
- ----------------------------------------------------------------------------------------------------------------------
</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 0.85% 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 have been
                  designated Class B shares. Shares held before May 1, 1997 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 17, 23 and 26).
                  - 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 and servicing shareholder accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no
                  event exceed an amount equal to payments at an annual rate of 0.85% of average daily net assets of
                  the Class (see pages 17, 25 and 26).
                  - 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 17, 25 and 26).
- ----------------------------------------------------------------------------------------------------------------------
Dividends         Dividends from net investment income are declared daily and paid monthly. Capital gains
and               distributions are paid at least annually. The Fund may, however, determine to retain all or part of
Capital Gains     any net long-term capital gains in any year for reinvestment. Dividends and capital gains
Distributions     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 pages 28
                  and 32).
- ----------------------------------------------------------------------------------------------------------------------
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 EasyInvest-SM-, if after twelve
                  months the shareholder has invested less than $1,000 in the account (see page 31).
- ----------------------------------------------------------------------------------------------------------------------
Special Risk      The net asset value of the Fund's shares will fluctuate with changes in the market value of its
Considerations    portfolio securities. The Fund's yield will also vary based on the yield of the Fund's portfolio
                  securities. The Fund may purchase and write options on debt instruments, in both exchange-listed and
                  over-the-counter transactions, and engage in transactions involving futures contracts and options
                  thereon. In addition, the Fund may borrow money and thereby leverage its securities investments (in
                  an amount up to 25% of the Fund's total assets) and purchase securities on a when-issued and delayed
                  delivery and firm commitment basis. These investments may involve special risks (see page 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 October 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....................................................        0.55%        0.55%        0.55%        0.55%
12b-1 Fees (5) (6).................................................        0.25%        0.85%        0.85%        None
Other Expenses.....................................................        0.13%        0.13%        0.13%        0.13%
Total Fund Operating Expenses (7)..................................        0.93%        1.53%        1.53%        0.68%
</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 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 0.20% OF THE AVERAGE DAILY NET ASSETS OF CLASS B AND
    0.25% OF THE AVERAGE DAILY NET ASSETS OF CLASS C ARE CURRENTLY EACH
    CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL ASSOCIATION OF
    SECURITIES DEALERS, INC. ("NASD") GUIDELINES AND ARE PAYMENTS 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 0.85% 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
- ----------------------------------------------------------------------------------  -----------  -----------  -----------
<S>                                                                                 <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.......................................................................   $      52    $      71    $      92
    Class B.......................................................................   $      66    $      78    $     103
    Class C.......................................................................   $      26    $      48    $      83
    Class D.......................................................................   $       7    $      22    $      38
 
You would pay the following expenses on the same $1,000 investment assuming no
 redemption at the end of the period:
    Class A.......................................................................   $      52    $      71    $      92
    Class B.......................................................................   $      16    $      48    $      83
    Class C.......................................................................   $      16    $      48    $      83
    Class D.......................................................................   $       7    $      22    $      38
 
<CAPTION>
EXAMPLES                                                                             10 YEARS
- ----------------------------------------------------------------------------------  -----------
<S>                                                                                 <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.......................................................................   $     152
    Class B.......................................................................   $     182
    Class C.......................................................................   $     182
    Class D.......................................................................   $      85
You would pay the following expenses on the same $1,000 investment assuming no
 redemption at the end of the period:
    Class A.......................................................................   $     152
    Class B.......................................................................   $     182
    Class C.......................................................................   $     182
    Class D.......................................................................   $      85
</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,
including 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 of the periods through October 31, 1996 have been
audited by Price Waterhouse LLP, independent accountants. The information for
the six-month period ended April 30, 1997 is unaudited. The financial highlights
should be read in conjunction with the financial statements, 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 have been designated Class B shares.
    
   
<TABLE>
<CAPTION>
                                                                   FOR THE YEAR ENDED OCTOBER 31
                                      ----------------------------------------------------------------------------------------
                                        1996      1995      1994      1993      1992      1991      1990      1989      1988
                           FOR THE    --------  --------  --------  --------  --------  --------  --------  --------  --------
                             SIX
                            MONTHS
                            ENDED
                          APRIL 30,
                             1997
                          ----------
                          (UNAUDITED)
<S>                       <C>         <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value,
   beginning of period...     $9.25      $9.49     $8.74    $10.03     $9.57     $9.46     $8.87     $9.27     $9.13     $9.27
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
  Net investment
   income................      0.29       0.59      0.59      0.60      0.65      0.68      0.72      0.72      0.71      0.74
  Net realized and
   unrealized gain
   (loss)................     (0.22)     (0.25)     0.75     (1.28)     0.46      0.11      0.59     (0.40)     0.34      0.08
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
  Total from investment
   operations............      0.07       0.34      1.34     (0.68)     1.11      0.79      1.31      0.32      1.05      0.82
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
  Less dividends and
   distributions from:
  Net investment
   income................     (0.29)     (0.58)    (0.59)    (0.61)    (0.65)    (0.68)    (0.72)    (0.72)    (0.71)    (0.74)
  Net realized gain......        --         --        --        --        --        --        --        --        --        --
  Paid-in-capital........        --         --        --        --        --        --        --        --     (0.20)    (0.22)
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
  Total dividends and
   distributions.........     (0.29)     (0.58)    (0.59)    (0.61)    (0.65)    (0.68)    (0.72)    (0.72)    (0.91)    (0.96)
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
  Net asset value, end of
   period................     $9.03      $9.25     $9.49     $8.74    $10.03     $9.57     $9.46     $8.87     $9.27     $9.13
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
                          ----------  --------  --------  --------  --------  --------  --------  --------  --------  --------
TOTAL INVESTMENT
 RETURN +................     0.79%(1)    3.79%   15.89%   (6.92)%    12.03%     8.56%    15.26%     3.64%    12.32%     9.21%
RATIOS TO AVERAGE NET
 ASSETS:
  Expenses...............     1.53%(2)    1.53%    1.52%     1.52%     1.50%     1.48%     1.50%     1.54%     1.47%     1.50%
  Net investment
   income................     6.42%(2)    6.31%    6.53%     6.56%     6.59%     7.18%     7.79%     7.92%     7.90%     8.04%
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in millions...      $637       $720      $829      $841    $1,128    $1,171    $1,252    $1,397    $1,824    $2,122
  Portfolio turnover
   rate..................        6%(1)      10%       7%       18%        7%        6%       --%++       5%      19%       44%
 
<CAPTION>
                            FOR THE
                            OCTOBER
                            31, 1987
                           ----------
 
<S>                       <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value,
   beginning of period...     $10.00
                           ----------
  Net investment
   income................       0.43
  Net realized and
   unrealized gain
   (loss)................      (0.58)
                           ----------
  Total from investment
   operations............      (0.15)
                           ----------
  Less dividends and
   distributions from:
  Net investment
   income................      (0.43)
  Net realized gain......      (0.15)
  Paid-in-capital........         --
                           ----------
  Total dividends and
   distributions.........      (0.58)
                           ----------
  Net asset value, end of
   period................      $9.27
                           ----------
                           ----------
TOTAL INVESTMENT
 RETURN +................    (1.47)%(1)
RATIOS TO AVERAGE NET
 ASSETS:
  Expenses...............      1.54%(2)
  Net investment
   income................      7.76%(2)
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in millions...     $2,067
  Portfolio turnover
   rate..................        32%(1)
</TABLE>
    
 
   
- -----------------
 *   COMMENCEMENT OF OPERATIONS.
 +   DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
     ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 ++  LESS THAN 0.5%.
(1)  NOT ANNUALIZED.
(2)  ANNUALIZED.
 
    
 
                                       6
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Dean Witter Federal Securities Trust (the "Fund") is an open-end diversified
management investment company. The Fund is a trust of the type commonly known as
a "Massachusetts business trust" and was organized under the laws of
Massachusetts on November 20, 1986.
 
   
    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 100 investment companies, thirty of which are
listed on the New York Stock Exchange, with combined total assets of
approximately $93.1 billion at June 30, 1997. The Investment Manager also
manages portfolios of pension plans, other institutions and individuals which
aggregated approximately $3.5 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 for 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 net assets determined as of the close of
each business day: 0.55% of the portion of the Fund's daily net assets not
exceeding $1 billion, scaled down at various asset levels to 0.35% of the
portion of daily net assets exceeding $12.5 billion. For the fiscal year ended
October 31, 1996, the Fund accrued total compensation to the Investment Manager
amounting to 0.55% of the Fund's average daily net assets and the Fund's total
expenses amounted to 1.53% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
    The investment objective of the Fund is to earn a high level of current
income. There can be no assurance that the investment objective will be
achieved. This objective is fundamental and cannot be changed without
shareholder approval. The following policies may be changed by the Board of
Trustees without shareholder approval.
 
    The Fund will seek to achieve its objective primarily by investing at least
65% of its total assets in U.S. Government securities (including such
 
securities purchased on a when-issued, delayed delivery or firm commitment
basis). U.S. Government securities include:
 
   (1) U.S. Treasury bills (maturities of one year or less), U.S. Treasury notes
(maturities of one to ten years) and U.S. Treasury bonds (generally maturities
of greater than ten years), all of which are direct obligations of the U.S.
Government and, as such, are backed by the "full faith and credit" of the United
States.
 
                                       7
<PAGE>
   (2) Securities issued by agencies and instrumentalities of the U.S.
Government which are backed by the full faith and credit of the United States.
Among the agencies and instrumentalities issuing such obligations are the
Federal Housing Administration, the Government National Mortgage Association
("GNMA"), the Department of Housing and Urban Development, the Export-Import
Bank, the Farmers Home Administration, the General Services Administration, the
Maritime Administration and the Small Business Administration. The maturities of
such obligations range from three months to thirty years.
 
   (3) Securities issued by agencies and instrumentalities which are not backed
by the full faith and credit of the United States, but whose issuing agency or
instrumentality has the right to borrow, to meet its obligations, from an
existing line of credit with the U.S. Treasury. Among the agencies and
instrumentalities issuing such obligations are the Tennessee Valley Authority,
the Federal National Mortgage Association ("FNMA"), the Federal Home Loan
Mortgage Corporation ("FHLMC") and the U.S. Postal Service.
 
   (4) Securities issued by agencies and instrumentalities which are not backed
by the full faith and credit of the United States, but which are backed by the
credit of the issuing agency or instrumentality. Among the agencies and
instrumentalities issuing such obligations are the Federal Farm Credit System
and the Federal Home Loan Banks.
 
    The Fund is not limited as to the maturities of the U.S. Government
securities in which it may invest. For a discussion of the risks of investing in
such securities (including such securities purchased on a when-issued, delayed
delivery or firm commitment basis and zero coupon securities), see "Risk
Considerations" below.
 
    MORTGAGE-BACKED SECURITIES.  The Fund may invest in fixed-rate and
adjustable rate U.S. mortgage-backed securities ("Mortgage-Backed Securities").
There are currently three basic types of U.S. Mortgage-Backed Securities: (i)
those issued or guaranteed by the U.S. Government or one of its agencies or
instrumentalities, such as GNMA, FNMA and FHLMC (securities issued by GNMA, but
not those issued by FNMA or FHLMC, are backed by the "full faith and credit" of
the United States); (ii) those issued by private issuers that represent an
interest in or are collateralized by Mortgage-Backed Securities issued or
guaranteed by the U.S. Government or one of its agencies or instrumentalities;
and (iii) those issued by private issuers that represent an interest in or are
collateralized by whole mortgage loans or Mortgage-Backed Securities without a
government guarantee but usually having some form of private credit enhancement.
 
    The Fund will invest in mortgage pass-through securities representing
participation interests in pools of residential mortgage loans originated by
U.S. governmental or private lenders such as banks, broker-dealers and financing
corporations and guaranteed, to the extent provided in such securities, by the
U.S. 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, FNMA and FHLMC. GNMA certificates
are direct obligations of the U.S. Government and, as such, are backed by the
"full faith and credit" of the United States. FNMA and FHLMC certificates are
not backed by the full faith and credit of the United States but, as noted
above, the issuing agency or instrumentality has the right to borrow, to meet
its obligations, from an existing line of credit with the U.S. Treasury. The
U.S.
 
                                       8
<PAGE>
Treasury has no legal obligation to provide such line of credit and may choose
not to do so.
 
    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.
 
    PRIVATE MORTGAGE PASS-THROUGH SECURITIES. The Fund may invest in private
mortgage pass-through securities, which are structured similarly to the GNMA,
FNMA and FHLMC mortgage pass-through securities and are issued by originators of
and investors in mortgage loans, including savings and loan associations,
mortgage banks, commercial banks, investment banks and special purpose
subsidiaries of the foregoing. These securities usually are backed by a pool of
conventional fixed rate or adjustable rate mortgage loans. Since private
mortgage pass-through securities typically are not guaranteed by an entity
having the credit status of GNMA, FNMA and FHLMC, such securities generally are
structured with one or more types of credit enhancement.
 
    COLLATERALIZED MORTGAGE OBLIGATIONS AND MULTICLASS PASS-THROUGH
SECURITIES.  The Fund may invest in collateralized mortgage obligations or
"CMOs," which 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 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 U.S. 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. 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,
 
                                       9
<PAGE>
and all future references to CMOs shall also be deemed to include REMICs. In
addition, in reliance upon an interpretation by the staff of the Securities and
Exchange Commission, the Fund may invest without limitation in CMOs and other
Mortgage-Backed Securities which are not by definition excluded from the
provisions of the Act, and which have obtained exemptive orders from such
provisions from the Securities and Exchange Commission.
 
    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.
 
    TYPES OF CREDIT ENHANCEMENT.  Mortgage-Backed Securities are often backed by
a pool of assets representing the obligations of a number of different parties.
To lessen the effect of failures by obligors on underlying assets to make
payments, those securities may contain elements of credit support, which fall
into two categories: (i) liquidity protection and (ii) protection against losses
resulting from ultimate default by an obligor on the underlying assets.
Liquidity protection refers to the provision of advances, generally by the
entity administering the pool of assets, to ensure that the receipt of payments
on the underlying pool occurs in a timely fashion. Protection against losses
resulting from default ensures ultimate payment of the obligations on at least a
portion of the assets in the pool. This protection may be provided through
guarantees, insurance policies or letters of credit obtained by the issuer or
sponsor from third parties, through various means of structuring the transaction
or through a combination of such approaches. The degree of credit support
provided for each issue is generally based on historical information respecting
the level of credit risk associated with the underlying assets. Delinquencies or
losses in excess of those anticipated could adversely affect the return on an
investment in a security. The Fund will not pay any fees for credit support,
although the existence of credit support may increase the price of a security.
 
                                       10
<PAGE>
    For a discussion of the risks of investing in Mortgage-Backed Securities,
see "Risk Considerations" below.
 
    To hedge against adverse changes in the prices of securities it anticipates
purchasing for its portfolio, the Fund may also write covered call and put
options against U.S. Government securities and cash held in its portfolio and
purchase options of the same or similar series to effect closing transactions.
In addition, the Fund may hedge portions of its portfolio securities against
potential changes in prevailing interest rates by purchasing put options on U.S.
Government securities and engaging in transactions involving interest rate
futures contracts and options on such contracts. See "Options and Futures
Transactions" below.
 
    While the Fund will be investing primarily in U.S. Government securities, it
may invest up to 35% of its total assets in options on U.S. Government
securities; options on futures contracts and futures contracts; repurchase
agreements; reverse repurchase agreements and dollar rolls (see "Risk
Considerations" below); money market instruments, including commercial paper
rated within the two highest grades by Standard & Poor's Corporation ("S&P") or
the highest grade by Moody's Investors Service, Inc. ("Moody's"), or, if not
rated, issued by a company having an outstanding debt issue rated at least AA by
S&P or Aa by Moody's); certificates of deposit; bankers' acceptances and other
obligations of domestic banks or domestic branches of foreign banks, in each
case having total assets of at least $500 million; and obligations of foreign
governments or their respective instrumentalities or agencies. Moreover, and
notwithstanding any of the above, the Fund may invest in such instruments
without limitation, on a temporary basis, when market conditions dictate a
"defensive" investment strategy. The Fund may also borrow money for the purpose
of leveraging its investments and lend its portfolio securities, as discussed
under "Risk Considerations" below.
 
OPTIONS AND FUTURES TRANSACTIONS
 
    OPTIONS.  The Fund is permitted to enter into call and put options on U.S.
Treasury notes, bonds and bills which are listed on Exchanges and written in
over-the-counter transactions ("OTC options"). Listed options are issued by the
Options Clearing Corporation ("OCC"). Ownership of a listed call option gives
the Fund the right to buy from the OCC the underlying security covered by the
option at the stated exercise price (the price per unit of the underlying
security) by filing an exercise notice prior to the expiration date of the
option. The writer (seller) of the option would then have the obligation to sell
to the OCC the underlying security at that exercise price prior to the
expiration date of the option, regardless of its then current market price.
Ownership of a listed put option would give the Fund the right to sell the
underlying security to the OCC at the stated exercise price.
 
    OTC OPTIONS.  OTC options are purchased from or sold (written) to dealers or
financial institutions which have entered into direct agreements with the Fund.
With OTC options, such variables as expiration date, exercise price and premium
will be agreed upon between the Fund and the transacting dealer, without the
intermediation of a third party such as the OCC. The Fund will engage in OTC
option transactions only with member banks of the Federal Reserve System or
primary U.S. Government securities dealers or with affiliates of such banks or
dealers which have capital of at least $50 million or whose obligations are
guaranteed by an entity having capital of at least $50 million.
 
    COVERED CALL WRITING.  The Fund is permitted to write covered call options
on U.S. Government securities only, without limit, in order to aid it in
achieving its investment objective. As a writer of a call option, the Fund has
the obligation, upon notice of exercise of the option, to deliver the security
underlying the option (certain listed call options written by the Fund will be
exercisable by the purchaser only on a specific date). See "Options and Futures
Transactions-- Covered Call Writing" in the Statement of Additional Information.
 
    COVERED PUT WRITING.  As a writer of covered put options, the Fund incurs an
obligation to buy the security underlying the option from the purchaser of
 
                                       11
<PAGE>
the put at the option's exercise price at any time during the option period. The
Fund will write put options for two purposes: (1) to receive the premiums paid
by purchasers; and (2) when the Investment Manager wishes to purchase the
security underlying the option at a price lower than its current market price,
in which case it will write the covered put at an exercise price reflecting the
lower purchase price sought. The aggregate value of the obligations underlying
the puts determined as of the date the options are sold will not exceed 50% of
the Fund's net assets. See "Options and Futures Transactions--Covered Put
Writing" in the Statement of Additional Information.
 
    PURCHASING CALL AND PUT OPTIONS.  The Fund may invest up to 10% of its total
assets in the purchase of put and call options on U.S. Government securities.
The Fund may purchase call options only in order to close out a covered call
position. The Fund may purchase put options on U.S. Government securities which
it holds (or has the right to acquire) in its portfolio only to protect itself
against a decline in the value of the security. The Fund may also purchase put
options to close out written put positions in a manner similar to call option
closing purchase transactions. There are no other limits on the Fund's ability
to purchase call and put options.
 
    FUTURES CONTRACTS.  The Fund may also purchase and sell interest rate
futures contracts ("futures contracts") that are traded on U.S. commodity
exchanges on such underlying securities as U.S. Treasury bonds, notes and bills
and GNMA certificates. As a futures contract purchaser, the Fund incurs an
obligation to take delivery of a specified amount of the obligation underlying
the contract at a specified time in the future for a specified price. As a
seller of a futures contract, the Fund incurs an obligation to deliver the
specified amount of the underlying obligation at a specified time in return for
an agreed upon price. The Fund will purchase or sell futures contracts only for
the purpose of hedging its portfolio (or anticipated portfolio) securities
against changes in prevailing interest rates. The Fund may also purchase and
write call and put options on futures contracts which are traded on an Exchange
and enter into closing transactions with respect to such options to terminate an
existing position. See "Options and Futures Transactions--Futures Contracts" and
"Options on Futures Contracts" in the Statement of Additional Information.
 
    For a discussion of the risks of options and futures transactions, see "Risk
Considerations" below and "Options and Futures Transactions" in the Statement of
Additional Information.
 
RISK CONSIDERATIONS
 
    The net asset value of the Fund's shares will fluctuate with changes in the
market value of its portfolio securities. The Fund's yield will also vary based
on the yield of the Fund's 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, 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-
 
                                       12
<PAGE>
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.
 
    The average life of Mortgage-Backed Securities varies with the maturities of
the underlying mortgage instruments, which may be up to thirty years but which
may include mortgage instruments with maturities of fifteen years, adjustable
rate mortgage instruments, variable rate mortgage instruments, graduated rate
mortgage instruments and/or other types of mortgage instruments. The assumed
average life of mortgages backing the majority of GNMA and FNMA certificates is
twelve years, and of FHLMC certificates is ten 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. CMOs issued by
private entities are not U.S. Government securities and are not guaranteed by
any government agency, although the securities underlying a CMO may be subject
to a guarantee. Therefore, if the collateral securing the CMO, as well as any
third party credit support or guarantees, is insufficient to make payment, the
holder could sustain a loss. However, the Fund will invest in CMOs issued by
private entities only if the CMOs are rated Aaa by Moody's or AAA by S&P, or, if
unrated, such CMOs are determined to be of comparable quality to the permitted
rated investments. Also, 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.
 
    RISKS OF OPTIONS AND FUTURES TRANSACTIONS. The Fund may close out its
position as writer of an option only if a liquid secondary market exists for
options of that series. There is no assurance that such a market will exist,
particularly in the case of OTC options, as such options will generally only be
closed out by entering into a closing purchase transaction with the purchasing
dealer. Also, Exchanges may limit the amount by which the price of a futures
contract may move on any day. If the price moves equal the daily limit on
successive days, then it may prove impossible to liquidate a futures position
until the daily limit moves have ceased.
 
    The extent to which the Fund may enter into transactions involving options
and futures contracts may be limited by the Internal Revenue Code's requirements
for qualification as a regulated invest-
 
                                       13
<PAGE>
ment company and the Fund's intention to qualify as such. See "Dividends,
Distributions and Taxes."
 
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk is that the Investment Manager could be incorrect in its
expectations as to the direction or extent of various interest rate movements or
the time span within which the movements take place. For example, if the Fund
sold futures contracts for the sale of securities in anticipation of an increase
in interest rates, and then interest rates went down instead, causing bond
prices to rise, the Fund would lose money on the sale. Another risk which may
arise in employing futures contracts to protect against the price volatility of
portfolio securities is that the prices of securities subject to futures
contracts (and thereby the futures contract prices) may correlate imperfectly
with the behavior of the cash prices of the Fund's portfolio securities. See the
Statement of Additional Information for further discussion of such risks.
 
    REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which
may be viewed as a type of secured lending by the Fund, and which typically
involve the acquisition by the Fund of debt securities from a selling financial
institution such as a bank, savings and loan association or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the future, usually not more than seven days from the date of
purchase. While repurchase agreements involve certain risks not associated with
direct investments in debt securities, including the risks of default or
bankruptcy of the selling financial institution, the Fund follows procedures
designed to minimize those risks. These procedures include effecting repurchase
transactions only with large, well-capitalized and well-established financial
institutions whose financial condition will be continually monitored by the
Investment Manager subject to procedures established by the Board of Trustees of
the Fund. In addition, the value of the collateral underlying the repurchase
agreement will be at least equal to the repurchase price, including any accrued
interest earned on the repurchase agreement. In the event of a default or
bankruptcy by a selling financial institution, the Fund will seek to liquidate
such collateral. However, the exercising of the Fund's right to liquidate such
collateral could involve certain costs or delays and, to the extent that
proceeds from any sale upon a default of the obligation to repurchase were less
than the repurchase price, the Fund could suffer a loss. The Fund may not invest
in repurchase agreements that do not mature within seven days if any such
investment, together with any other illiquid assets held by the Fund, amounts to
more than 10% of its total assets.
 
    LEVERAGING.  The Fund may borrow money, but only from a bank and in an
amount up to 25% of the Fund's total assets taken at the lower of market value
or cost, not including the amount borrowed. When the Fund borrows it will be
because it seeks additional income by leveraging its investments through
purchasing securities with the borrowed funds. The Fund will be required to
maintain an asset coverage (including the proceeds of borrowings) of at least
300% of such borrowings in accordance with the provisions of the Investment
Company Act of 1940, as amended (the "Act"). The investment policy provides that
the Fund may not purchase or sell a security on margin. Borrowings for
leveraging will be subject to current margin requirements of the Federal Reserve
Board and where necessary the Fund may use any or all of its securities as
collateral for such borrowings. Any investment gains made with the additional
monies in excess of interest paid will cause the net asset value of the Fund's
shares to rise to a greater extent than would otherwise be the case. Conversely,
if the investment performance of the additional monies fails to cover their cost
to the Fund, net asset value will decrease to a greater extent than would
otherwise be the case. This is the speculative factor involved in leverage. If,
due to market fluctuations or other reasons, the value of the Fund's assets
 
                                       14
<PAGE>
(including the proceeds of borrowings) becomes at any time less than three times
the amount of any outstanding bank debt, the Fund, within three business days,
will reduce its bank debt to the extent necessary to meet the required 300%
asset coverage. In doing this, the Fund may have to sell a portion of its
investments at a time when it may be disadvantageous to do so.
 
    ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased
by the Fund may be zero coupon securities. 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.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FIRM COMMITMENTS.  From time
to time, in the ordinary course of business, the Fund may purchase U.S.
Government securities on a when-issued or delayed delivery basis or may purchase
or sell U.S. Government securities on a firm commitment basis. When such
transactions are negotiated, the price is fixed at the time of the commitment,
but delivery and payment can take place a month or more after the date of the
commitment. 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.
 
    REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS.  The Fund may also use
reverse repurchase agreements and dollar rolls as part of its investment
strategy. Reverse repurchase agreements involve sales by the Fund of portfolio
assets concurrently with an agreement by the Fund to repurchase the same assets
at a later date at a fixed price. The Fund may enter into dollar rolls in which
the Fund sells securities for delivery in the current month and simultaneously
contracts to repurchase substantially similar (same type and coupon) securities
on a specified future date. Reverse repurchase agreements and dollar rolls
involve the risk that the market value of the securities the Fund is obligated
to repurchase under the agreement may decline below the repurchase price. In the
event the buyer of securities under a reverse repurchase agreement or dollar
roll files for bankruptcy or becomes insolvent, the Fund's use of the proceeds
of the agreement may be restricted pending a determination by the other party,
or its trustee or receiver, whether to enforce the Fund's obligation to
repurchase the securities.
 
    Reverse repurchase agreements and dollar rolls are speculative techniques
involving leverage, and are considered borrowings by the Fund.
 
    LENDING OF PORTFOLIO SECURITIES.  Consistent with applicable regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers and
other financial institutions, provided that such loans are callable at any time
by the Fund (subject to certain notice provisions described in the Statement of
Additional Information), and are at all times secured by cash or money market
instruments, which are maintained in a segregated account pur-
 
                                       15
<PAGE>
suant to applicable regulations and that are equal to at least the market value,
determined daily, of the loaned securities. As with any extensions of credit,
there are risks of delay in recovery and in some cases even loss of rights in
the collateral should the borrower of the securities fail financially. However,
loans of portfolio securities will only be made to firms deemed by the
Investment Manager to be creditworthy and when the income which can be earned
from such loans justifies the attendant risks.
 
    For additional risk disclosure, please refer to the discussion of specific
investments under the "Investment Objective and Policies" section of the
Prospectus and the "Investment Practices and Policies" section of the Statement
of Additional Information.
 
PORTFOLIO MANAGEMENT
 
   
    The Fund's portfolio is actively managed by its Investment Manager with a
view to achieving the Fund's investment objective. In determining which
securities to purchase for the Fund or hold in the Fund's portfolio, the
Investment Manager will rely on information from various sources, including
research, analysis and appraisals of brokers and dealers, including Dean Witter
Reynolds Inc. ("DWR") and other broker-dealer affiliates of InterCapital, and
others regarding economic developments and interest rate trends, and the
Investment Manager's own analysis of factors it deems relevant. The Fund is
managed within InterCapital's Taxable Fixed-Income Group, which manages
twenty-four funds and fund portfolios, with approximately $12.8 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 June, 1987 and has been managing portfolios
comprised of government securities at InterCapital for over five years.
    
 
   
    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. Orders for transactions in other
portfolio securities and commodities are placed for the Fund with a number of
brokers and dealers, including DWR and other brokers and dealers that are
affiliates of the Investment Manager. The Fund may incur brokerage commissions
on transactions conducted through such affiliates. Pursuant to an order of the
Securities and Exchange Commission, the Fund may effect principal transactions
in certain money market instruments with DWR. It is not anticipated that the
portfolio trading engaged in by the Fund will result in its portfolio turnover
rate exceeding 100%.
    
 
    Except as specified, the investment policies noted above are not fundamental
policies and may be changed without shareholder approval.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    The investment restrictions listed below are among the restrictions that
have been adopted by the Fund as fundamental policies. Under the Act, a
fundamental policy may not be changed without the vote of a majority of the
outstanding voting securities of the Fund, as defined in the Act.
 
    The Fund may not:
 
   1. Invest more than 5% of the value of its total assets in the securities of
any one issuer (other than obligations issued, or guaranteed by, the United
States Government, its agencies or instrumentalities).
 
   2. Purchase more than 10% of all outstanding voting securities or any class
of securities of any one issuer.
 
   3. Invest more than 10% of its total assets in "illiquid securities"
(securities for which market quotations are not readily available) and
repurchase agreements which have a maturity of longer than seven days. The staff
of the Securities and Exchange Commission ("SEC") has taken the position that
purchased OTC options and the assets used as "cover" for written OTC options are
illiquid securities. The Investment Manager disagrees with this position.
Nevertheless, the Fund has agreed to treat OTC
 
                                       16
<PAGE>
options and the covering assets thereon as illiquid securities for purposes of
this investment restriction.
 
   4. Invest more than 5% of the value of its total assets in securities of
issuers having a record, together with predecessors, of less than three years of
continuous operation. This restriction shall not apply to any obligation of the
United States Government, its agencies or instrumentalities.
 
   5. Purchase or sell commodities or commodities contracts except that the Fund
may purchase or write interest rate futures contracts and related options
thereon.
 
   6. Pledge its assets or assign or otherwise encumber them except to secure
permitted borrowings. (For the purpose of this restriction, collateral
arrangements with respect to the writing of options and collateral arrangements
with respect to initial or variation margin for futures are not deemed to be
pledges of assets.)
 
   7. Purchase securities on margin (but the
Fund may obtain short-term loans as are necessary for the clearance of
transactions). The deposit or payment by the Fund of initial or variation margin
in connection with futures contracts or related options thereon is not
considered the purchase of a security on margin.
 
   8. Borrow money, except from banks for investment purposes or as a temporary
measure for extraordinary or emergency purposes in an amount up to 25% of the
Fund's total assets, within the limits set forth in the Act or enter into
reverse repurchase agreements in an amount exceeding 10% of the Fund's total
assets other than for purposes of meeting redemptions.
 
    If a percentage restriction is adhered to at the time of investment, a later
increase or decrease in percentage resulting from a change in values of
portfolio securities or amount of total or net assets will not be considered a
violation of any of the foregoing restrictions.
 
   
    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.
    
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
   
GENERAL
    
 
   
    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 who have entered into selected dealer agreements with the
Distributor ("Selected Broker-Dealers"). The principal executive office of the
Distributor is located at Two World Trade Center, New York, New York 10048.
    
 
   
    The 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
    
 
                                       17
<PAGE>
   
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 of the Fund and other Dean Witter Funds that
are multiple class funds ("Dean Witter Multi-Class Funds") and shares of Dean
Witter Funds sold with a front-end sales charge ("FSC Funds") and concurrent
investments in Class D shares of the Fund and other 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 Federal 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-SM-, an automatic purchase plan (see "Shareholder
Services"), is $100, provided that the schedule of automatic investments will
result in investments totalling $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 is due on 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 if 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. Sales personnel of a Selected Broker-Dealer are compensated for
selling shares of the Fund at the time of their sale 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,
    
 
                                       18
<PAGE>
   
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 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 0.85% 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 0.85% 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
    
 
                                       19
<PAGE>
   
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 0.85% (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,
shares of FSC Funds and shares of Dean Witter Funds for which such 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.
    
 
   
    Set forth below is a chart comparing the sales charge, 12b-1 fees and
conversion options applicable to each Class of shares:
    
 
   
<TABLE>
<CAPTION>
<C>        <S>              <C>         <C>
                                         CONVERSION
  CLASS     SALES CHARGE    12B-1 FEE      FEATURE
    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%         0.85%   B shares
           CDSC during the              convert to A
           first year                   shares
           decreasing to 0              automatically
           after six years              after
                                        approximately
                                        ten years
    C      1.0% CDSC            0.85%        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
    
 
                                       20
<PAGE>
   
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 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.
    
 
   
    COMBINED PURCHASE PRIVILEGE.  Investors may have the benefit of reduced
sales charges in accordance with the above schedule by combining purchases of
Class A shares of the Fund in single transactions with the purchase of Class A
shares of other Dean Witter Multi-Class Funds and shares of FSC Funds. The sales
charge payable on the purchase of the Class A shares of the Fund, the Class A
shares of the other Dean Witter Multi-Class Funds and the shares of the FSC
Funds will be at their respective rates applicable to the total amount of the
combined concurrent purchases of such shares.
    
 
   
    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 shares of the Fund and other Dean Witter Funds previously
purchased at a price including a front-end sales charge (including shares of the
Fund and other Dean Witter Funds acquired in
    
 
                                       21
<PAGE>
   
exchange for those shares, and including in each case shares acquired through
reinvestment of dividends and distributions), which are held at the time of such
transaction, amounts to $25,000 or more. If such investor has a cumulative net
asset value of shares of FSC Funds and Class A and Class D shares equal to at
least $5 million, such investor 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 shares of other Dean Witter 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 the Fund or shares of other Dean Witter Funds 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 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
    
 
                                       22
<PAGE>
   
   (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 0.85% 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                     CDSC AS A
            PURCHASE                    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
purchased more than six years (or, in the case of shares held by certain
employer-sponsored benefit
    
 
                                       23
<PAGE>
   
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 FSC Funds 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 have been designated Class B shares. Shares held before May 1, 1997 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
    
 
                                       24
<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 0.85% 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
    
 
                                       25
<PAGE>
   
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; (v) certain other open-end investment
companies whose shares are distributed by the Distributor; and (vi) other
categories of investors, at the discretion of the Board, as disclosed in the
then current prospectus of the Fund. 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, shares of FSC Funds and
shares of Dean Witter Funds for which such 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 0.85% 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 0.85% 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 currently 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 currently
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 October 31, 1996, Class B shares of the Fund
accrued payments under the Plan amounting to $6,554,450, which amount is equal
to 0.85% of the Fund's average daily net assets for the fiscal year. The
payments accrued under the Plan were calculated pursuant to
    
 
                                       26
<PAGE>
   
clause (b) of the compensation formula under the Plan. All shares held prior to
July 28, 1997 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 CDSCs
paid by investors upon the redemption of 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
$27,489,031 at October 31, 1996, which was equal to 3.82% 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 0.85% 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 latest bid price prior to the time of valuation, and (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 Trustees (valuation of securities
for which market quotations are not readily available may also be based upon
current market prices of securities which are comparable in coupon, rating and
maturity or an appropriate matrix utilizing similar factors).
 
    Short-term debt 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. The value of other assets will be deter-
 
                                       27
<PAGE>
mined in good faith under procedures established by and under the supervision of
the Trustees.
 
    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.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
   
    AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All income 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 open-end 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 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.
    
 
                                       28
<PAGE>
    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 through the
Distributor 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 Fund.
 
   
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 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 business 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
    
 
                                       29
<PAGE>
   
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 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. In the case
of a shareholder holding a share certificate or certificates, no exchanges may
be made until all applicable share certificates have been received by the
Transfer Agent and deposited in the shareholder's account. 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.
 
                                       30
<PAGE>
    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(s), the shares may be redeemed by surrendering the certificate(s)
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 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 upon repurchase by the Fund
or the Distributor. 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 the
    
 
                                       31
<PAGE>
   
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-SM-, 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 him or her sixty days
to make an additional investment in an amount which will increase the value of
his of 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 and declares dividends 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. Such dividends are paid
monthly.
    
 
    The Fund may pay quarterly dividends of realized net short-term capital
gains, if any. Such dividends may include a portion of the premiums received by
the Fund from expired call and put options written by the Fund on U.S.
Government securities, and of the net gains realized on closing purchase
transactions with respect to such options. The Fund may elect to retain a
portion of any net short-term capital gains for reinvestment. Net realized
long-term capital gains, if any, will be distributed at least once per year,
although the Investment Manager reserves the right to retain a portion of such
gains for reinvestment.
 
    As of October 31, 1996, the Fund had a net capital loss carryover of
approximately $58,206,000. To the extent of such carryover, the Fund could
retain gains realized in future years without either the Fund or its
shareholders being required to pay a tax on such gains. However, the Fund may
distribute to shareholders realized gains. Such distributions could,
notwithstanding the loss carryover, be taxable to shareholders to the extent of
the Fund's realized gains. Also, the Fund may at times make payments from
sources other than income or net capital gains. Payments from such sources will,
in effect, represent a return of a portion of each shareholder's investment.
All, or a portion, of such payments will not be taxable to shareholders.
 
   
    All dividends and 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 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 all of its net investment
income and net short-term capital gains to shareholders and otherwise continue
to qualify as a regulated investment company under Subchapter M of the Internal
Revenue Code,
 
                                       32
<PAGE>
it is not expected that the Fund will be required to pay any federal income tax
on such income and capital gains.
 
    Gains or losses on the Fund's transactions in listed options on securities,
futures and options on futures may be treated as 60% long-term and 40%
short-term. When the Fund engages in options and futures transactions, various
tax regulations applicable to the Fund may have the effect of causing the Fund
to recognize a gain or loss for tax purposes before that gain or loss is
realized, or to defer recognition of a realized loss for tax purposes.
Recognition, for tax purposes, of an unrealized loss may result in a lesser
amount of the Fund's realized net short-term gains being available for quarterly
distribution.
 
    As a regulated investment company, the Fund is subject to the requirement
that less than 30% of its gross income be derived from the sale or other
disposition of securities held for less than three months. Accordingly, the Fund
may be restricted in the writing of options on securities held for less than
three months, in the writing of options which expire in less than three months,
and in effecting closing transactions with respect to call or put options which
have been written or purchased less than three months prior to such
transactions. The Fund may also be restricted in its ability to engage in
transactions involving futures contracts.
 
   
    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. 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, for tax purposes, to have
been received by the shareholder in the prior year.
    
 
    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, distributions and the proceeds of redemptions and repurchases,
shareholders' taxpayer identification numbers must be furnished and certified as
to their 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
maximum offering price per share at the end of the period), all in accordance
with applicable regulatory requirements. Such amount is compounded for six
months and then annualized for a twelve-month period to derive the Fund's yield
for each Class.
    
 
                                       33
<PAGE>
   
    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, or the life of the Fund, if less than any of the foregoing.
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 incurred by 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,
year-by-year or other types of total return figures. Such calculations may or
may not reflect the deduction of any sales charge 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 (such as Lipper Analytical Services, Inc. and Salomon
Brothers Treasury Index, Shearson Lehman Government Bond Index, Merrill Lynch
Mortgage Master Index and Donahue's Money Market Index).
    
 
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
 
                                       34
<PAGE>
goals and comply with regulatory requirements, the Code of Ethics requires,
among other things, that personal securities transactions by employees of the
companies be subject to an advance clearance process to monitor that no Dean
Witter Fund is engaged at the same time in a purchase or sale of the same
security. The Code of Ethics bans the purchase of securities in an initial
public offering, and also prohibits engaging in futures and options transactions
and profiting on short-term trading (that is, a purchase within sixty days of a
sale or a sale within sixty days of a purchase) of a security. In addition,
investment personnel may not purchase or sell a security for their personal
account within thirty days before or after any transaction in any Dean Witter
Fund managed by them. Any violations of the Code of Ethics are subject to
sanctions, including reprimand, demotion or suspension or termination of
employment. The Code of Ethics comports with regulatory requirements and the
recommendations in the 1994 report by the Investment Company Institute Advisory
Group on Personal Investing.
 
   
    MASTER/FEEDER CONVERSION.  The 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 INQUIRES.  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.
 
                                       35
<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 Income Builder Fund                     American Value Series
Dean Witter Japan Fund                              Capital Growth Series
Dean Witter Special Value Fund                      Dividend Growth Series
Dean Witter Financial Services Trust                Strategist Series
Dean Witter Market Leader Trust                     Utilities Series
ASSET ALLOCATION FUNDS                              Value-Added Market Series
Dean Witter Strategist Fund                         Global Equity Series
Dean Witter Global Asset Allocation Fund
ACTIVE ASSETS ACCOUNT PROGRAM
Active Assets Money Trust
Active Assets Tax-Free Trust
Active Assets Government Securities Trust
Active Assets California Tax-Free Trust
</TABLE>
    
 
<PAGE>
 
   
Dean Witter
Federal Securities Trust
Two World Trade Center
                                    Dean Witter
New York, New York 10048
 
TRUSTEES                            Federal
Michael Bozic                       Securities Trust
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Barry Fink
Vice President, Secretary and
General Counsel
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>
 
   
<TABLE>
<S>                                                       <C>
STATEMENT OF ADDITIONAL INFORMATION                       DEAN WITTER
JULY 28, 1997                                             FEDERAL SECURITIES
                                                          TRUST
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
    Dean Witter Federal Securities Trust (the "Fund") is an open-end diversified
management investment company whose investment objective is to earn a high level
of current income. The Fund will seek to achieve its investment objective by
investing primarily in debt securities issued by the U.S. Government, its
agencies or instrumentalities and by writing covered call and put options
against such securities. The Fund may also purchase options on such securities
to effect closing transactions. In addition, to hedge the Fund's portfolio of
securities against changes in prevailing interest rates, the Fund may purchase
put options on U.S. Government securities and engage in transactions involving
interest rate futures contracts and options on such contracts. Shares of the
Fund are not issued, insured or guaranteed by the U.S. Government, its agencies
or instrumentalities.
 
   
    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
Federal Securities Trust
Two World Trade Center
New York, New York 10048
(212) 392-2550 or
(800) 869-NEWS (toll-free)
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
The Fund and its Management............................................................          3
 
Trustees and Officers..................................................................          6
 
Investment Practices and Policies......................................................         12
 
Investment Restrictions................................................................         24
 
Portfolio Transactions and Brokerage...................................................         25
 
The Distributor........................................................................         26
 
Purchase of Fund Shares................................................................         31
 
Shareholder Services...................................................................         33
 
Redemptions and Repurchases............................................................         38
 
Dividends, Distributions and Taxes.....................................................         39
 
Performance Information................................................................         41
 
Description of Shares of the Fund......................................................         42
 
Custodian and Transfer Agent...........................................................         43
 
Independent Accountants................................................................         43
 
Reports to Shareholders................................................................         43
 
Legal Counsel..........................................................................         44
 
Experts................................................................................         44
 
Registration Statement.................................................................         44
 
Report of Independent Accountants......................................................         45
 
Financial Statements -- October 31, 1996...............................................         46
 
Financial Statements -- April 30, 1997 (unaudited).....................................         58
 
Appendix -- Ratings of Corporate Debt Instruments......................................         70
</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
November 20, 1986. The Fund's name was changed from Dean Witter Government
Securities Plus to Dean Witter Federal Securities Trust by the Trustees of the
Fund on August 17, 1992.
 
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 is conducted by or under the direction of officers of the Fund
and of the Investment Manager, subject to review by the Fund's Board of
Trustees. Information as to these Trustees and officers is contained under the
caption "Trustees and Officers."
    
 
   
    InterCapital is also the investment manager or investment adviser of the
following investment companies: Dean Witter Liquid Asset Fund Inc., InterCapital
Income Securities Inc., Dean Witter High Yield Securities Inc., Dean Witter
Tax-Free Daily Income Trust, Dean Witter Developing Growth Securities Trust,
Dean Witter Tax-Exempt Securities Trust, Dean Witter Natural Resource
Development Securities, Inc., Dean Witter Dividend Growth Securities Inc., Dean
Witter American Value Fund, Dean Witter U.S. Government Money Market Trust, Dean
Witter Variable Investment Series, Dean Witter World Wide Investment Trust, Dean
Witter Select Municipal Reinvestment Fund, Dean Witter U.S. Government
Securities Trust, Dean Witter California Tax-Free Income Fund, Dean Witter New
York Tax-Free Income Fund, Dean Witter Convertible Securities Trust, Dean Witter
Intermediate Income Securities, Dean Witter Value-Added Market Series, High
Income Advantage Trust, High Income Advantage Trust II, High Income Advantage
Trust III, Dean Witter Government Income Trust, Dean Witter Utilities Fund, Dean
Witter California Tax-Free Daily Income Trust, Dean Witter Strategist Fund, Dean
Witter World Wide Income Trust, Dean Witter New York Municipal Money Market
Trust, Dean Witter Capital Growth Securities, Dean Witter European Growth Fund
Inc., Dean Witter Precious Metals and Minerals Trust, Dean Witter Global
Short-Term Income Fund Inc., Dean Witter Pacific Growth Fund Inc., Dean Witter
Multi-State Municipal Series Trust, Dean Witter Short-Term U.S. Treasury Trust,
InterCapital Insured Municipal Bond Trust, InterCapital Insured Municipal Trust,
InterCapital Insured Municipal Income Trust, InterCapital California Insured
Municipal Income Trust, InterCapital Insured Municipal Securities, InterCapital
Insured California Municipal Securities, InterCapital Quality Municipal
Investment Trust, InterCapital Quality Municipal Income Trust, InterCapital
Quality Municipal Securities, InterCapital California Quality Municipal
Securities, InterCapital New York Quality Municipal Securities, Dean Witter
Diversified Income Trust, Dean Witter Health Sciences Trust, Dean Witter
Retirement Series, Dean Witter Global Dividend Growth Securities, Dean Witter
Limited Term Municipal Trust, Dean Witter Short-Term Bond Fund, Dean Witter
Global Utilities Fund, Dean Witter National Municipal Trust, Dean Witter High
Income Securities, Dean Witter International SmallCap Fund, Dean Witter Mid-Cap
Growth Fund, Dean Witter Select Dimensions Investment Series, Dean Witter
Balanced Growth Fund, Dean Witter Balanced Income Fund, Dean Witter Hawaii
Municipal Trust, Dean Witter Capital Appreciation Fund, Dean Witter Information
Fund, Dean Witter Intermediate Term U.S. Treasury Trust, Dean Witter Japan Fund,
Dean Witter Income Builder Fund, Dean Witter Special Value Fund, Dean Witter
Financial Services Trust, Dean Witter Market Leader Trust, Active Assets Money
Trust, Active Assets Tax-Free Trust, Active Assets California Tax-Free Trust,
Active Assets Government Securities Trust, Municipal Income Trust, Municipal
Income
    
 
                                       3
<PAGE>
Trust II, Municipal Income Trust III, Municipal Income Opportunities Trust,
Municipal Income Opportunities Trust II, Municipal Income Opportunities Trust
III, Prime Income Trust and Municipal Premium Income Trust. 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: TCW/DW Core Equity
Trust, TCW/DW North American Government Income Trust, TCW/DW Latin American
Growth Fund, TCW/DW Income and Growth Fund, TCW/DW Small Cap Growth Fund, TCW/DW
Balanced Fund, TCW/DW Total Return Trust, TCW/DW Mid-Cap Equity Trust, TCW/DW
Global Telecom Trust, TCW/DW Strategic Income Trust, TCW/DW Emerging Markets
Opportunities Trust, TCW/DW Term Trust 2000, TCW/DW Term Trust 2002 and TCW/DW
Term Trust 2003 (the "TCW/DW Funds"). InterCapital also serves as: (i)
administrator of The BlackRock Strategic Term Trust Inc., a closed-end
investment company; and (ii) 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, 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 legal services as the Fund may
reasonably require in the conduct of its business, including the preparation of
prospectuses, statements of additional information, 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 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 of 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
    
 
                                       4
<PAGE>
   
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: 0.55% of the portion of
the daily net assets of the Fund not exceeding $1 billion; 0.525% of the portion
of the Fund's daily net assets exceeding $1 billion but not exceeding $1.5
billion; 0.50% of the portion of the Fund's daily net assets exceeding $1.5
billion but not exceeding $2 billion; 0.475% of the portion of the Fund's daily
net assets exceeding $2 billion but not exceeding $2.5 billion; 0.45% of the
portion of the Fund's daily net assets exceeding $2.5 billion but not exceeding
$5 billion; 0.425% of the portion of the Fund's daily net assets exceeding $5
billion but not exceeding $7.5 billion; 0.40% of the portion of the Fund's daily
net assets exceeding $7.5 billion but not exceeding $10 billion; 0.375% of the
portion of the Fund's daily net assets exceeding $10 billion but not exceeding
$12.5 billion; and 0.35% of the portion of the Fund's daily net assets exceeding
$12.5 billion. Total compensation accrued to the Investment Manager for the
fiscal years ended October 31, 1994, 1995 and 1996 amounted to $5,387,156,
$4,542,697 and $4,241,115, 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 in no way restricts the Investment Manager from
acting as investment manager or adviser to others.
 
   
    The Agreement was initially approved by the Board of 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 Board
of 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 had 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 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
 
                                       5
<PAGE>
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.
 
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
Trustee                                                 Corporation (since November, 1995); Director or Trustee of
c/o Levitz Furniture Corporation                        the Dean Witter Funds; formerly President and Chief
6111 Broken Sound Parkway, N.W.                         Executive Officer of Hills Department Stores (May,
Boca Raton, Florida                                     1991-July, 1995); formerly variously Chairman, Chief
                                                        Executive Officer, President and Chief Operating Officer
                                                        (1987-1991) of the Sears Merchandise Group of Sears,
                                                        Roebuck and Co.; Director of Eaglemark Financial Services,
                                                        Inc., the United Negro College Fund and Weirton Steel Cor-
                                                        poration.
 
Charles A. Fiumefreddo* (64)                            Chairman, Chief Executive Officer and Director of
Chairman of the Board, President,                       InterCapital, DWSC and Distributors; Executive Vice
Chief Executive Officer and Trustee                     President and Director of DWR; Chairman, Director or
Two World Trade Center                                  Trustee, President and Chief Executive Officer of the Dean
New York, New York                                      Witter Funds; Chairman, Chief Executive Officer and
                                                        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 Presi-
                                                        dent and Director of Dean Witter, Discover & Co. (until
                                                        February, 1993).
 
Edwin J. Garn (64)                                      Director or Trustee of the Dean Witter Funds; formerly
Trustee                                                 United States Senator (R-Utah) (1974-1992) and Chairman,
c/o Huntsman Corporation                                Senate Banking Committee (1980-1986); formerly Mayor of
500 Huntsman Way                                        Salt Lake City, Utah (1971-1974); formerly Astronaut,
Salt Lake City, Utah                                    Space Shuttle Discovery (April 12-19, 1985); Vice
                                                        Chairman, Huntsman Corporation (since January, 1993);
                                                        Director of Franklin Quest (time management systems) and
                                                        John Alden Financial Corp. (health insurance); member of
                                                        the board of various civic and charitable organizations.
 
John R. Haire (72)                                      Chairman of the Audit Committee and Chairman of the
Trustee                                                 Committee of the Independent Directors or Trustees and
Two World Trade Center                                  Director or Trustee of the Dean Witter Funds; Chairman of
New York, New York                                      the Audit Committee and Chairman of the Committee of the
                                                        Independent Trustees and Trustee of the TCW/DW Funds;
                                                        formerly President, Council for Aid to Education
                                                        (1978-1989) and Chairman and Chief Executive Officer of
                                                        Anchor Corporation, an Investment Adviser (1964-1978);
                                                        Director of Washington National Corporation (insurance).
</TABLE>
    
 
                                       6
<PAGE>
   
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------------------  ----------------------------------------------------------
<S>                                                     <C>
Wayne E. Hedien** (63)                                  Retired; Director or Trustee of the Dean Witter Funds
Trustee                                                 (commencing on September 1, 1997); Director of The PMI
c/o Gordon Altman Butowsky                              Group, Inc. (private mortgage insurance); Trustee and Vice
 Weitzen Shalov & Wein                                  Chairman of The Field Museum of Natural History; formerly
Counsel to the Independent Trustees                     associated with the Allstate Companies (1966-1994), most
114 West 47th Street                                    recently as Chairman of The Allstate Corporation (March,
New York, New York                                      1993-December, 1994) and Chairman and Chief Executive
                                                        Officer of its 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
Trustee                                                 consulting firm; Co-Chairman and a founder of the Group of
c/o Johnson Smick International, Inc.                   Seven Council (G7C), an international economic commission;
1133 Connecticut Avenue, N.W.                           Director or Trustee of the Dean Witter Funds; Trustee of
Washington, DC                                          the TCW/DW Funds; Director of NASDAQ (since June, 1995);
                                                        Director of Greenwich Capital Markets, Inc.
                                                        (broker-dealer); Trustee of the Financial Accounting
                                                        Foundation (oversight organization for 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, L.P., a private in-
Trustee                                                 vestment partnership; Director or Trustee of the Dean
c/o Triumph Capital, L.P.                               Witter Funds; Trustee of the TCW/DW Funds; formerly Vice
237 Park Avenue                                         President, Bankers Trust Company and BT Capital
New York, New York                                      Corporation (1984-1988); director of various business
                                                        organizations.
 
Philip J. Purcell* (54)                                 Chairman of the Board of Directors and Chief Executive
Trustee                                                 Officer of MSDWD, DWR and Novus Credit Services Inc.;
c/o Morgan Stanley, Dean Witter,                        Director of InterCapital, DWSC and Distributors; Director
  Discover & Co.                                        or Trustee of the Dean Witter Funds; Director and/or
1585 Broadway                                           officer of various MSDWD subsidiaries.
New York, New York
 
John L. Schroeder (66)                                  Retired; Director or Trustee of the Dean Witter Funds;
Trustee                                                 Trustee of the TCW/DW Funds; Director of Citizens
c/o Gordon Altman Butowsky Weitzen                      Utilities Company; formerly Executive Vice President and
  Shalov & Wein                                         Chief Investment Officer of the Home Insurance Company
Counsel to the Independent Trustees                     (August, 1991-September, 1995).
114 West 47th Street
New York, New York
</TABLE>
    
 
                                       7
<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
Vice President, Secretary                               and General Counsel (since February, 1997) of InterCapital
 and General Counsel                                    and DWSC; Senior Vice President (since March, 1997) and
Two World Trade Center                                  Assistant Secretary and Assistant General Counsel (since
New York, New York                                      February, 1997) of Distributors; Assistant 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
Vice President                                          various Dean Witter Funds.
Two World Trade Center
New York, New York
 
Thomas F. Caloia (51)                                   First Vice President and Assistant Treasurer of Inter-
Treasurer                                               Capital and DWSC; Treasurer of the Dean Witter Funds and
Two World Trade Center                                  the TCW/DW Funds.
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. Robert S.
Giambrone, Senior Vice President of InterCapital, DWSC, Distributors and DWTC,
and Director of DWTC, Joseph J. McAlinden, Executive Vice President and Chief
Investment Officer of InterCapital and Director of DWTC, and Kenton J.
Hinchliffe, Jonathan R. Page and James F. Willison, Senior Vice Presidents of
InterCapital, are Vice Presidents of the Fund. Marilyn K. Cranney, First Vice
President and Assistant General Counsel of InterCapital and DWSC, Lou Anne D.
McInnis, Ruth Rossi and Carsten Otto, Vice Presidents and Assistant General
Counsels of InterCapital and DWSC, and Frank Bruttomesso, a Staff Attorney 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 $87.9 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.
    
 
                                       8
<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.
    
 
   
    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
    
 
                                       9
<PAGE>
   
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 October 31, 1996.
 
                               FUND COMPENSATION
 
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,750
Edwin J. Garn.................................................       1,850
John R. Haire.................................................       3,900
Dr. Manuel H. Johnson.........................................       1,800
Michael E. Nugent.............................................       1,750
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 Funds
are included solely because of a limited exchange privilege between those Funds
and five Dean Witter Money Market Funds.
    
 
                                       10
<PAGE>
   
           CASH COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS
    
 
   
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS    FOR SERVICE     TOTAL CASH
                                                                    CHAIRMAN OF          AS         COMPENSATION
                                                                   COMMITTEES OF     CHAIRMAN OF        PAID
                               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.
    
 
   
    The following table illustrates the retirement benefits accrued to the
Fund's Independent Trustees by the Fund for the fiscal year ended October 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
October 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>
                                                                               RETIREMENT BENEFITS
                                              FOR ALL ADOPTING FUNDS                                     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%       $     393   $  20,147  $     950  $    51,325
Edwin J. Garn.......................              10               50.0              577      27,772        950       51,325
John R. Haire.......................              10               50.0              372      46,952      2,343      129,550
Dr. Manuel H. Johnson...............              10               50.0              240      10,926        950       51,325
Michael E. Nugent...................              10               50.0              413      19,217        950       51,325
John L. Schroeder...................               8               41.7              763      38,700        792       42,771
</TABLE>
    
 
- ------------------------
   
(1) An Eligible Trustee may elect alternate payments of his or her retirement
    benefits based upon the combined life expectancy of such Eligible Trustee
    and his or her spouse on the date of such Eligible Trustee's retirement. The
    amount estimated to be payable under this method, through the remainder of
    the later of the lives of such Eligible Trustee and spouse, will be the
    actuarial equivalent of the Regular Benefit. In addition, the Eligible
    Trustee may elect that the surviving spouse's periodic payment of benefits
    will be equal to either 50% or 100% of the previous periodic amount, an
    election that, respectively, increases or decreases the previous periodic
    amount so that the resulting payments will be the actuarial equivalent of
    the Regular Benefit.
    
 
   
(2) Based on current levels of compensation. Amount of annual benefits also
    varies depending on the Trustee's elections described in Footnote (1) above.
    
 
                                       11
<PAGE>
   
    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, certain of the U.S. Government securities
purchased by the Fund are "mortgage-backed securities", which evidence an
interest in a specific pool of mortgages. Such securities are issued by the
Government National Mortgage Association ("GNMA"), Federal National Mortgage
Association ("FNMA") and the Federal Home Loan Mortgage Corporation ("FHLMC").
 
    GNMA CERTIFICATES.  GNMA Certificates evidence an interest in a specific
pool of mortgages insured by the Federal Housing Administration ("FHA") or the
Farmers Home Administration 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 principal investments.
 
    The average life of pass-through pools varies with the maturities of the
underlying mortgage instruments. In addition, a pool's term may be shortened by
unscheduled or early payments of principal on the underlying mortgages. The
occurrence of mortgage prepayments is affected by such factors as 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 12
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 12 years, but
typically not less than 5 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.
Such fees in the aggregate usually amount to approximately .50 of 1%.
 
    Yields on pass-through securities are typically quoted by investment dealers
and vendors based on the maturities 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 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 12-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 semiannually, as is the case with
traditional bonds.
 
                                       12
<PAGE>
    FHLMC SECURITIES.  The Federal Home Loan Mortgage Corporation was created in
1970 through enactment of Title III of the Emergency Home Finance Act of 1970.
Its purpose is to promote development of a nationwide secondary market in
conventional residential mortgages.
 
    The FHLMC issues two types of mortgage pass-through securities, mortgages
participation certificates ("PCs") and guaranteed mortgages certificates
("GMCs"). PCs resemble GNMA Certificates in that each PC represents a pro rata
share of all interest and principal payments made and owned on the underlying
pool. The FHMLC guarantees timely monthly payment of interest on PCs and the
full return of principal when due. PCs have an assumed average life similar to
GNMA Certificates.
 
    GMCs also represent a pro rata interest in a pool of mortgages. However,
these instruments pay interest semi-annually and return principal once a year in
guaranteed minimum payments. The expected average life of these securities is
approximately ten years.
 
    FNMA SECURITIES.  The Federal National Mortgage Association was established
in 1938 to create a secondary market in mortgages insured by the FHA.
 
    FNMA issues guaranteed mortgage pass-through certificates ("FNMA
Certificates"). FNMA Certificates resemble GNMA Certificates in that each FNMA
Certificate represents a pro rata share of all interest and principal payments
made and owed on the underlying pool. FNMA guarantees timely payment of interest
on FNMA Certificates and the full return of principal. FNMA Certificates have an
assumed average life similar to GNMA Certificates.
 
    LEVERAGING.  As discussed in the Prospectus, the Fund may borrow money, but
only from a bank and in an amount up to 25% of the value of the Fund's total
assets taken at the lower of market value or cost, not including the amount
borrowed, in an effort to obtain additional income by leveraging its investments
through purchasing securities with the borrowed funds. Such borrowings will be
subject to current margin requirements of the Federal Reserve Board and where
necessary the Fund may use any or all of its securities as collateral for such
borrowings. Any investment gains made with the additional monies in excess of
interest paid will cause the net asset value of the Fund's shares to rise to a
greater extent than would otherwise be the case. Conversely, if the investment
performance of the additional monies fails to cover their cost to the Fund, net
asset value will decrease to a greater extent than would otherwise be the case.
This is the speculative factor involved in leverage.
 
    The Fund will be required to maintain an asset coverage (including the
proceeds of borrowings) of at least 300% of such borrowings in accordance with
the provisions of the Act. If, due to market fluctuations or other reasons, the
value of the Fund's assets (including the proceeds of borrowings) becomes at any
time less than three times the amount of any outstanding bank debt, the Fund,
within three business days, will reduce its bank debt to the extent necessary to
meet the required 300% asset coverage. In restoring the 300% asset coverage, the
Fund may have to sell a portion of its investments at a time when it may be
disadvantageous to do so.
 
    The investment policy provides that the Fund may not purchase or sell a
security on margin. The margin and bank borrowing restrictions will prevent the
ordinary purchase of a security which involves a cash borrowing from a broker of
any part of the purchase price of a security.
 
    The Fund may also borrow from banks as a temporary measure for extraordinary
or emergency purposes, and for these purposes and leveraging combined, in no
event an amount greater than 25% of the value of the Fund's total assets. The
Fund did not borrow any money during its fiscal year ended October 31, 1996.
 
    LENDING OF PORTFOLIO SECURITIES.  Consistent with applicable regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers and
other financial institutions, provided that such loans are callable at any time
by the Fund (subject to notice provisions described below), and are at all times
secured by cash or cash equivalents, which are maintained in a segregated
account pursuant to applicable regulations and that are equal to at least the
market value, determined daily, of the loaned securities. The advantage of such
loans is that the Fund continues to receive the income on the loaned securities
while at the same time earning interest on the cash amounts deposited as
collateral, which will
 
                                       13
<PAGE>
be invested in short-term obligations. The Fund will not lend its portfolio
securities if such loans are not permitted by the laws or regulations of any
state in which its shares are qualified for sale and will not lend more than 25%
of the value of its total assets.
 
    A loan may be terminated by the borrower on one business day's notice, or by
the Fund on two business days' notice. If the borrower fails to deliver the
loaned securities within two days after receipt of notice, the Fund could use
the collateral to replace the securities while holding the borrower liable for
any excess of replacement cost over collateral. As with any extensions of
credit, there are risks of delay in recovery and in some cases even loss of
rights in the collateral should the borrower of the securities fail financially.
However, these loans of portfolio securities will only be made to firms deemed
by the Fund's management to be creditworthy and when the income which can be
earned from such loans justifies the attendant risks. Upon termination of the
loan, the borrower is required to return the securities to the Fund. Any gain or
loss in the market price during the loan period would inure to the Fund. The
creditworthiness of firms to which the Fund lends its portfolio securities will
be monitored on an ongoing basis by the Investment Manager pursuant to
procedures adopted and reviewed, on an ongoing basis, by the Board of Trustees
of the Fund.
 
    When voting or consent rights which accompany loaned securities pass to the
borrower, the Fund will follow the policy of calling the loaned securities, to
be delivered within one day after notice, to permit the exercise of such rights
if the matters involved would have a material effect on the Fund's investment in
such loaned securities. The Fund will pay reasonable finder's, administrative
and custodial fees in connection with a loan of its securities. The Fund has not
to date lent any of its portfolio securities.
 
   
    REPURCHASE AGREEMENTS.  When cash may be available for only a few days, it
may be invested by the Fund in repurchase agreements until such time as it may
otherwise be invested or used for payments of obligations of the Fund. These
agreements, which may be viewed as a type of secured lending by the Fund,
typically involve the acquisition by the Fund of debt securities from a selling
financial institution such as a bank, savings and loan association or
broker-dealer. The agreement provides that the Fund will sell back to the
institution, and that the institution will repurchase, the underlying security
("collateral"), which is held by the Fund's Custodian, at a specified price and
at a fixed time in the future, usually not more than seven days from the date of
purchase. The collateral will be maintained in a segregated account and will be
marked-to-market daily to determine that the full value of the collateral, as
specified in the agreement, does not decrease. If such decrease occurs,
additional collateral will be added to the account to maintain full
collateralization. In the event the original seller defaults on its obligations,
the Fund will seek to sell the collateral, which action could involve costs or
delays. In such case, the Fund's ability to dispose of the collateral to recover
its investment may be restricted or delayed.
    
 
    The Fund will accrue interest from the institution until the time when the
repurchase is to occur. Although such date is deemed by the Fund to be the
maturity date of a repurchase agreement, the maturities of securities subject to
repurchase agreements are not subject to any limits. While repurchase agreements
involve certain risks not associated with direct investments in debt securities,
the Fund follows procedures designed to minimize such risks. These procedures
include effecting repurchase transactions only with large, well-capitalized and
well-established financial institutions, whose financial condition will be
continually monitored. In addition, the value of the collateral underlying the
repurchase agreement will always be at least equal to the repurchase price,
including any accrued interest earned on the repurchase agreement. In the event
of a default or bankruptcy by a selling financial institution, the Fund will
seek to liquidate such collateral. However, the exercising of the Fund's right
to liquidate such collateral could involve certain costs or delays and, to the
extent that proceeds from any sale upon a default of the obligation to
repurchase were less than the repurchase price, the Fund could suffer a loss. It
is the current policy of the Fund not to invest in repurchase agreements that do
not mature within seven days if any such investment, together with any other
illiquid assets held by the Fund, amounts to more than 10% of its total assets.
The Fund's investments in repurchase agreements may at times be substantial
when, in the view of the Investment Manager, liquidity or other considerations
warrant.
 
    REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS.  The Fund may also use
reverse repurchase agreements and dollar rolls as part of its investment
strategy. Reverse repurchase agreements involve
 
                                       14
<PAGE>
sales by the Fund of portfolio assets concurrently with an agreement by the Fund
to repurchase the same assets at a later date at a fixed price. Generally, the
effect of such a transaction is that the Fund can recover all or most of the
cash invested in the portfolio securities involved during the term of the
reverse repurchase agreement, while it will be able to keep the interest income
associated with those portfolio securities. Such transactions are only
advantageous if the interest cost to the Fund of the reverse repurchase
transaction is less than the cost of obtaining the cash otherwise. Opportunities
to achieve this advantage may not always be available, and the Fund intends to
use the reverse repurchase technique only when it will be to its advantage to do
so.
 
    The Fund may enter into dollar rolls in which the Fund sells securities for
delivery in the current month and simultaneously contracts to repurchase
substantially similar (same type and coupon) securities on a specified future
date. During the roll period, the Fund foregoes principal and interest paid on
the securities. The Fund is compensated by the difference between the current
sales price and the lower forward price for the future purchase (often referred
to as the "drop") as well as by the interest earned on the cash proceeds of the
initial sale.
 
    The Fund will establish a segregated account with its Custodian in which it
will maintain cash or cash equivalents or other liquid portfolio securities
equal in value to its obligations in respect of reverse repurchase agreements.
Reverse repurchase agreements and dollar rolls are considered borrowings by the
Fund and for purposes other than meeting redemptions may not exceed 10% of the
Fund's total assets.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  As
discussed in the Prospectus, from time to time 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 a
month or more 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 or
dividends accrue to the purchaser prior to the settlement date. 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 liquid portfolio securities equal in value to commitments
to purchase securities on a when-issued, delayed delivery or forward commitment
basis.
 
OPTIONS AND FUTURES TRANSACTIONS
 
    The Fund may write covered call options against securities held in its
portfolio and covered put options on eligible portfolio securities and purchase
options of the same series to effect closing transactions, and may hedge against
potential changes in the market value of investments (or anticipated
investments) by purchasing put and call options on portfolio (or eligible
portfolio) securities and engaging in transactions involving futures contracts
and options on such contracts.
 
    Call and put options on U.S. Treasury notes, bonds and bills are listed on
Exchanges (currently the Chicago Board Options Exchange and the American Stock
Exchange) and are written in over-the-counter transactions ("OTC options").
Listed options are issued by the Options Clearing Corporation ("OCC"). Ownership
of a listed call option gives the Fund the right to buy from the OCC the
underlying security covered by the option at the stated exercise price (the
price per unit of the underlying security) by filing an exercise notice prior to
the expiration date of the option. The writer (seller) of the option would then
have the obligation to sell to the OCC the underlying security at that exercise
price prior to the expiration date of the option, regardless of its then current
market price. Ownership of a listed put option
 
                                       15
<PAGE>
would give the Fund the right to sell the underlying security to the OCC at the
stated exercise price. Upon notice of exercise of the put option, the writer of
the put would have the obligation to purchase the underlying security from the
OCC at the exercise price.
 
    OTC OPTIONS.  Exchange-listed options are issued by the OCC which assures
that all transactions in such options are properly executed. OTC options are
purchased from or sold (written) to dealers or financial institutions which have
entered into direct agreements with the Fund. With OTC options, such variables
as expiration date, exercise price and premium will be agreed upon between the
Fund and the transacting dealer, without the intermediation of a third party
such as the OCC. If the transacting dealer fails to make or take delivery of the
securities underlying an option it has written, in accordance with the terms of
that option, the Fund would lose the premium paid for the option as well as any
anticipated benefit of the transaction. The Fund will engage in OTC option
transactions only with member banks of the Federal Reserve System or primary
U.S. Government securities dealers or with affiliates of such banks or dealers
which have capital of at least $50 million or whose obligations are guaranteed
by an entity having capital of at least $50 million.
 
    OPTIONS ON TREASURY BONDS AND NOTES.  Because trading interest in options
written on Treasury bonds and notes tends to center mostly on the most recently
auctioned issues, the exchanges on which such securities trade will not continue
indefinitely to introduce options with new expirations to replace expiring
options on particular issues. Instead, the expirations introduced at the
commencement of options trading on a particular issue will be allowed to run
their course, with the possible addition of a limited number of new expirations
as the original ones expire. Options trading on each issue of bonds or notes
will thus be phased out as new options are listed on more recent issues, and
options representing a full range of expirations will not ordinarily be
available for every issue on which options are traded.
 
    OPTIONS ON TREASURY BILLS.  Because a deliverable Treasury bill changes from
week to week, writers of Treasury bill calls cannot provide in advance for their
potential exercise settlement obligations by acquiring and holding the
underlying security. However, if the Fund holds a long position in Treasury
bills with a principal amount of the securities deliverable upon exercise of the
option, the position may be hedged from a risk standpoint by the writing of a
call option. For so long as the call option is outstanding, the Fund will hold
the Treasury bills in a segregated account with its Custodian, so that it will
be treated as being covered.
 
    OPTIONS ON GNMA CERTIFICATES.  Currently, options on GNMA Certificates are
only traded over-the-counter. Since the remaining principal balance of GNMA
Certificates declines each month as a result of mortgage payments, the Fund, as
a writer of a GNMA call holding GNMA Certificates as "cover" to satisfy its
delivery obligation in the event of exercise, may find that the GNMA
Certificates it holds no longer have a sufficient remaining principal balance
for this purpose. Should this occur, the Fund will purchase additional GNMA
Certificates from the same pool (if obtainable) or replacement GNMA Certificates
in the cash market in order to maintain its cover. A GNMA Certificate held by
the Fund to cover an option position in any but the nearest expiration month may
cease to represent cover for the option in the event of a decline in the GNMA
coupon rate at which new pools are originated under the FHA/VA loan ceiling in
effect at any given time, as such decline may increase the prepayments made on
other mortgage pools. If this should occur, the Fund will no longer be covered,
and the Fund will either enter into a closing purchase transaction or replace
such Certificate with a Certificate which represents cover. When the Fund closes
out its position or replaces such Certificate, it may realize an unanticipated
loss and incur transaction costs.
 
    RISKS OF OPTIONS ON U.S. GOVERNMENT SECURITIES.  During the option period,
the covered call writer has, in return for the premium on the option, given up
the opportunity for capital appreciation above the exercise price should the
market price of the underlying security increase, but has retained the risk of
loss should the price of the underlying security decline. The secured put writer
also retains the risk of loss should the market value of the underlying security
decline below the exercise price of the option. In both cases, the writer has no
control over the time when it may be required to fulfill its obligation as a
 
                                       16
<PAGE>
writer of the option. Once an option writer has received an exercise notice, it
cannot effect a closing purchase transaction in order to terminate its
obligation under the option and must deliver the underlying securities at the
exercise price.
 
    Prior to exercise or expiration, an option position can only be terminated
by entering into a closing purchase or sale transaction. If a covered call
option writer is unable to effect a closing purchase transaction or to purchase
an offsetting OTC option, it cannot sell the underlying security until the
option expires or the option is exercised. Accordingly, a covered call option
writer may not be able to sell an underlying security at a time when it might
otherwise be advantageous to do so. A secured put option writer who is unable to
effect a closing purchase transaction or to purchase an offsetting OTC option
would continue to bear the risk of decline in the market price of the underlying
security until the option expires or is exercised. In addition, a secured put
writer would be unable to utilize the amount held in cash or U.S. Government
securities as security for the put option for other investment purposes until
the exercise or expiration of the option.
 
    As discussed in the Prospectus, the Fund's ability to close out its position
as a writer of an exchange-listed option is dependent upon the existence of a
liquid secondary market on Option Exchanges. Among the possible reasons for the
absence of a liquid secondary market on an Exchange are: (i) insufficient
trading interest in certain options; (ii) restrictions on transactions imposed
by an Exchange; (iii) trading halts, suspensions or other restrictions imposed
with respect to particular classes or series of options or underlying
securities; (iv) interruption of the normal operations on an Exchange; (v)
inadequacy of the facilities of an Exchange or the Options Clearing Corporation
("OCC") to handle current trading volume; or (vi) a decision by one or more
Exchanges to discontinue the trading of options (or a particular class or series
of options), in which event the secondary market on that Exchange (or in that
class or series of options) would cease to exist, although outstanding options
on that Exchange that had been issued by the OCC as a result of trades on that
Exchange would generally continue to be exercisable in accordance with their
terms.
 
    The hours of trading for options on U.S. Government securities may not
conform to the hours during which the underlying securities are traded. To the
extent that the option markets close before the markets for the underlying
securities, significant price and rate movements can take place in the
underlying markets that cannot be reflected in the option markets.
 
    COVERED CALL WRITING.  The Fund is permitted to write covered call options
on portfolio securities, without limit. Generally, a call option is "covered" if
the Fund owns, or has the right to acquire, without additional cash
consideration (or for additional cash consideration held for the Fund by its
Custodian in a segregated account) the underlying security subject to the option
except that in the case of call options on U.S. Treasury bills, the Fund might
own U.S. Treasury bills of a different series from those underlying the call
option, but with a principal amount and value corresponding to the exercise
price and a maturity date no later than that of the securities deliverable under
the call option. A call option is also covered if the Fund holds a call on the
same security as the underlying security of the written option, where the
exercise price of the call used for coverage is equal to or less than the
exercise price of the call written or greater than the exercise price of the
call written if the mark to market difference is maintained by the Fund in cash,
U.S. Government securities or other liquid portfolio securities which the Fund
holds in a segregated account maintained with its Custodian.
 
    The Fund will receive from the purchaser, in return for a call it has
written, a "premium"; i.e., the price of the option. Receipt of these premiums
may better enable the Fund to achieve a greater total return than would be
realized from holding the underlying securities alone. Moreover, the premium
received will offset a portion of the potential loss incurred by the Fund if the
securities underlying the option are ultimately sold by the Fund at a loss. The
premium received will fluctuate with varying economic market conditions. If the
market value of the portfolio securities upon which call options have been
written increases, the Fund may receive less total return from the portion of
its portfolio upon which calls have been written than it would have had such
calls not been written.
 
                                       17
<PAGE>
    As regards listed options and certain OTC options, during the option period,
the Fund may be required, at any time, to deliver the underlying security
against payment of the exercise price on any calls it has written (exercise of
certain listed and OTC options may be limited to specific expiration dates).
This obligation is terminated upon the expiration of the option period or at
such earlier time when the writer effects a closing purchase transaction. A
closing purchase transaction is accomplished by purchasing an option of the same
series as the option previously written. However, once the Fund has been
assigned an exercise notice, the Fund will be unable to effect a closing
purchase transaction.
 
    Closing purchase transactions are ordinarily effected to realize a profit on
an outstanding call option to prevent an underlying security from being called,
to permit the sale of an underlying security or to enable the Fund to write
another call option on the underlying security with either a different exercise
price or expiration date or both. Also, effecting a closing purchase transaction
will permit the cash or proceeds from the concurrent sale of any securities
subject to the option to be used for other investments by the Fund. The Fund may
realize a net gain or loss from a closing purchase transaction depending upon
whether the amount of the premium received on the call option is more or less
than the cost of effecting the closing purchase transaction. Any loss incurred
in a closing purchase transaction may be wholly or partially offset by
unrealized appreciation in the market value of the underlying security.
Conversely, a gain resulting from a closing purchase transaction could be offset
in whole or in part or exceeded by a decline in the market value of the
underlying security.
 
    If a call option expires unexercised, the Fund realizes a gain in the amount
of the premium on the option less the commission paid. Such a gain, however, may
be offset by depreciation in the market value of the underlying security during
the option period. If a call option is exercised, the Fund realizes a gain or
loss from the sale of the underlying security equal to the difference between
the purchase price of the underlying security and the proceeds of the sale of
the security plus the premium received on the option less the commission paid.
 
    Options written by a Fund normally have expiration dates of up to eighteen
months from the date written. The exercise price of a call option may be below,
equal to or above the current market value of the underlying security at the
time the option is written.
 
    COVERED PUT WRITING.  As a writer of a covered put option, the Fund incurs
an obligation to buy the security underlying the option from the purchaser of
the put, at the option's exercise price at any time during the option period, at
the purchaser's election (certain listed put options written by the Fund will be
exercisable by the purchaser only on a specific date). A put is "covered" if, at
all times, the Fund maintains, in a segregated account maintained on its behalf
at the Fund's Custodian, cash, U.S. Government securities or other liquid
portfolio securities in an amount equal to at least the exercise price of the
option, at all times during the option period. Similarly, a written put position
could be covered by the Fund by its purchase of a put option on the same
security as the underlying security of the written option, where the exercise
price of the purchased option is equal to or more than the exercise price of the
put written or less than the exercise price of the put written if the mark to
market difference is maintained by the Fund in cash, U.S. Government securities
or other liquid portfolio securities which the Fund holds in a segregated
account maintained at its Custodian. In writing puts, the Fund assumes the risk
of loss should the market value of the underlying security decline below the
exercise price of the option (any loss being decreased by the receipt of the
premium on the option written). In the case of listed options, during the option
period, the Fund may be required, at any time, to make payment of the exercise
price against delivery of the underlying security. The operation of and
limitations on covered put options in other respects are substantially identical
to those of call options.
 
    The Fund will write put options for two purposes: (1) to receive the income
derived from the premiums paid by purchasers; and (2) when the Investment
Manager wishes to purchase the security underlying the option at a price lower
than its current market price, in which case it will write the covered put at an
exercise price reflecting the lower purchase price sought. The potential gain on
a covered put option is limited to the premium received on the option (less the
commissions paid on the transaction)
 
                                       18
<PAGE>
while the potential loss equals the differences between the exercise price of
the option and the current market price of the underlying securities when the
put is exercised, offset by the premium received (less the commissions paid on
the transaction).
 
    PURCHASING CALL AND PUT OPTIONS.  The Fund may purchase listed and OTC call
and put options in amounts equalling up to 10% of its total assets. The Fund may
purchase call options only in order to close out a covered call position (see
"Covered Call Writing" above). The call purchased is likely to be on the same
securities and have the same terms as the written option.
 
    The Fund may purchase put options on securities which it holds (or has the
right to acquire) in its portfolio only to protect itself against a decline in
the value of the security. If the value of the underlying security were to fall
below the exercise price of the put purchased in an amount greater than the
premium paid for the option, the Fund would incur no additional loss. The Fund
may also purchase put options to close out written put positions in a manner
similar to call options closing purchase transactions. In addition, the Fund may
sell a put option which it has previously purchased prior to the sale of the
securities underlying such option. Such a sale would result in a net gain or
loss depending on whether the amount received on the sale is more or less than
the premium and other transaction costs paid on the put option which is sold.
Any such gain or loss could be offset in whole or in part by a change in the
market value of the underlying security. If a put option purchased by the Fund
expired without being sold or exercised, the premium would be lost.
 
    RISKS OF OPTIONS TRANSACTIONS.  During the option period, the covered call
writer has, in return for the premium on the option, given up the opportunity
for capital appreciation above the exercise price should the market price of the
underlying security increase, but has retained the risk of loss should the price
of the underlying security decline. The secured put writer also retains the risk
of loss should the market value of the underlying security decline below the
exercise price of the option less the premium received on the sale of the
option. In both cases, the writer has no control over the time when it may be
required to fulfill its obligation as a writer of the option. Once an option
writer has received an exercise notice, it cannot effect a closing purchase
transaction in order to terminate its obligation under the option and must
deliver or receive the underlying securities at the exercise price.
 
    Prior to exercise or expiration, an option position can only be terminated
by entering into a closing purchase or sale transaction. If a covered call
option writer is unable to effect a closing purchase transaction or to purchase
an offsetting OTC option, it cannot sell the underlying security until the
option expires or the option is exercised. Accordingly, a covered call option
writer may not be able to sell an underlying security at a time when it might
otherwise be advantageous to do so. A secured put option writer who is unable to
effect a closing purchase transaction or to purchase an offsetting OTC option
would continue to bear the risk of decline in the market price of the underlying
security until the option expires or is exercised. In addition, a secured put
writer would be unable to utilize the amount held in cash or U.S. Government
securities or other liquid portfolio securities as security for the put option
for other investment purposes until the exercise or expiration of the option.
 
    The Fund's ability to close out its position as a writer of an option is
dependent upon the existence of a liquid secondary market on option exchanges.
There is no assurance that such a market will exist, particularly in the case of
OTC options, as such options will generally only be closed out by entering into
a closing purchase transaction with the purchasing dealer. However, the Fund may
be able to purchase an offsetting option which does not close out its position
as a writer but constitutes an asset of equal value to the obligation under the
option written. If the Fund is not able to either enter into a closing purchase
transaction or purchase an offsetting position, it will be required to maintain
the securities subject to the call, or the collateral underlying the put, even
though it might not be advantageous to do so, until a closing transaction can be
entered into (or the option is exercised or expires).
 
    Among the possible reasons for the absence of a liquid secondary market on
an Exchange are: (i) insufficient trading interest in certain options; (ii)
restrictions on transactions imposed by an Exchange; (iii) trading halts,
suspensions or other restrictions imposed with respect to particular classes or
series of options or underlying securities; (iv) interruption of the normal
operations on an Exchange;
 
                                       19
<PAGE>
(v) inadequacy of the facilities of an Exchange or the Options Clearing
Corporation ("OCC") to handle current trading volume; or (vi) a decision by one
or more Exchanges to discontinue the trading of options (or a particular class
or series of options), in which event the secondary market on that Exchange (or
in that class or series of options) would cease to exist, although outstanding
options on that Exchange that had been issued by the OCC as a result of trades
on that Exchange would generally continue to be exercisable in accordance with
their terms.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in options, the Fund could experience delays and/or losses in
liquidating open positions purchased or sold through the broker and/or incur a
loss of all or part of its margin deposits with the broker. Similarly, in the
event of the bankruptcy of the writer of an OTC option purchased by the Fund,
the Fund could experience a loss of all or part of the value of the option.
Transactions are entered into by the Fund only with brokers or financial
institutions deemed creditworthy by the Investment Manager.
 
    Each of the Exchanges has established limitations governing the maximum
number of call or put options on the same underlying security or futures
contract (whether or not covered) which may be written by a single investor,
whether acting alone or in concert with others (regardless of whether such
options are written on the same or different Exchanges or are held or written on
one or more accounts or through one or more brokers). An Exchange may order the
liquidation of positions found to be in violation of these limits and it may
impose other sanctions or restrictions. These position limits may restrict the
number of listed options which the Fund may write.
 
    The hours of trading for options may not conform to the hours during which
the underlying securities are traded. To the extent that the option markets
close before the markets for the underlying securities, significant price and
rate movements can take place in the underlying markets that cannot be reflected
in the option markets.
 
    INTEREST RATE FUTURES CONTRACTS.  As a purchaser of an interest rate futures
contract ("futures contract"), the Fund incurs an obligation to take delivery of
a specified amount of the obligation underlying the futures contract at a
specified time in the future for a specified price. As a seller of a futures
contract, the Fund incurs an obligation to deliver the specified amount of the
underlying obligation at a specified time in return for an agreed upon price.
 
    The Fund will purchase or sell futures contracts for the purpose of hedging
its portfolio (or anticipated portfolio) securities against changes in
prevailing interest rates. If the Investment Manager anticipates that interest
rates may rise and, concomitantly, the price of U.S. Government securities fall,
the Fund may sell a futures contract. If declining interest rates are
anticipated, the Fund may purchase a futures contract to protect against a
potential increase in the price of U.S. Government securities the Fund intends
to purchase. Subsequently, appropriate U.S. Government securities may be
purchased by the Fund in an orderly fashion; as securities are purchased,
corresponding futures positions would be terminated by offsetting sales of
contracts. In addition, futures contracts will be bought or sold in order to
close out a short or long position in a corresponding futures contract.
 
    Although most futures contracts call for actual delivery or acceptance of
securities, the contracts usually are closed out before the settlement date
without the making or taking of delivery. A futures contract sale is closed out
by effecting a futures contract purchase for the same aggregate amount of the
specific type of security and the same delivery date. If the sale price exceeds
the offsetting purchase price, the seller would be paid the difference and would
realize a gain. If the offsetting purchase price exceeds the sale price, the
seller would pay the difference and would realize a loss. Similarly, a futures
contract purchase is closed out by effecting a futures contract sale for the
same aggregate amount of the specific type of security and the same delivery
date. If the offsetting sale price exceeds the purchase price, the purchaser
would realize a gain, whereas if the purchase price exceeds the offsetting sale
price, the purchaser would realize a loss. There is no assurance that the Fund
will be able to enter into a closing transaction.
 
    When the Fund enters into a futures contract it is initially required to
deposit with its Custodian, in a segregated account in the name of the broker
performing the transaction an "initial margin" of cash or
 
                                       20
<PAGE>
U.S. Government securities or other liquid portfolio securities equal to
approximately 2% of the contract amount. Initial margin requirements are
established by the Exchanges on which futures contracts trade and may, from time
to time, change. In addition, brokers may establish margin deposit requirements
in excess of those required by the Exchanges.
 
    Initial margin in futures transactions is different from margin in
securities transactions in that initial margin does not involve the borrowing of
funds by a brokers' client but is, rather, a good faith deposit on the futures
contract which will be returned to the Fund upon the proper termination of the
futures contract. The margin deposits made are marked to market daily and the
Fund may be required to make subsequent deposits into the segregated account,
maintained at its Custodian for that purpose, of cash or U.S. Government
securities, called "variation margin," in the name of the broker, which are
reflective of price fluctuations in the futures contract. Currently, interest
rate futures contracts can be purchased on debt securities such as U.S. Treasury
bills and bonds, U.S. Treasury notes with maturities between 6 1/2 and 10 years,
GNMA Certificates and bank certificates of deposit.
 
    OPTIONS ON FUTURES CONTRACTS.  The Fund may purchase and write call and put
options on futures contracts which are traded on an Exchange and enter into
closing transactions with respect to such options to terminate an existing
position. An option on a futures contract gives the purchaser the right (in
return for the premium paid), and the writer the obligation, to assume a
position in a futures contract (a long position if the option is a call and a
short position if the option is a put) at a specified exercise price at any time
during the term of the option. Upon exercise of the option, the delivery of the
futures position by the writer of the option to the holder of the option is
accompanied by delivery of the accumulated balance in the writer's futures
margin account, which represents the amount by which the market price of the
futures contract at the time of exercise exceeds, in the case of a call, or is
less than, in the case of a put, the exercise price of the option on the futures
contract.
 
    The Fund will purchase and write options on futures contracts for identical
purposes to those set forth above for the purchase of a futures contract
(purchase of a call option or sale of a put option) and the sale of a futures
contract (purchase of a put option or sale of a call option), or to close out a
long or short position in futures contracts. If, for example, the Investment
Manager wished to protect against an increase in interest rates and the
resulting negative impact on the value of a portion of its U.S. Government
securities portfolio, it might write a call option on an interest rate futures
contract, the underlying security of which correlates with the portion of the
portfolio the Investment Manager seeks to hedge. Any premiums received in the
writing of options on futures contracts may, of course, augment the total return
of the Fund and thereby provide a further hedge against losses resulting from
price declines in portions of the Fund's portfolio.
 
    The writer of an option on a futures contract is required to deposit initial
and variation margin pursuant to requirements similar to those applicable to
futures contracts. Premiums received from the writing of an option on a futures
contract are included in initial margin deposits.
 
    LIMITATIONS ON FUTURES CONTRACTS AND OPTIONS ON FUTURES.  The Fund may not
enter into futures contracts or purchase related options thereon if, immediately
thereafter, the amount committed to margin plus the amount paid for premiums for
unexpired options on futures contracts exceeds 5% of the value of the Fund's
total assets, after taking into account unrealized gains and unrealized losses
on such contracts it has entered into, provided, however, that in the case of an
option that is in-the-money (the exercise price of the call (put) option is less
(more) than the market price of the underlying security) at the time of
purchase, the in-the-money amount may be excluded in calculating the 5%.
However, there is no overall limitation on the percentage of the Fund's assets
which may be subject to a hedge position. In addition, in accordance with the
regulations of the Commodity Futures Trading Commission ("CFTC") under which the
Fund is exempted from registration as a commodity pool operator, the Fund may
only enter into futures contracts and options on futures contracts transactions
for purposes of hedging a part or all of its portfolio. If the CFTC changes its
regulations so that the Fund would be permitted to write options on futures
contracts for purposes other than hedging the Fund's investments without CFTC
registration, the Fund may engage in such transactions for those purposes.
Except as described above, there are no other limitations on the use of futures
and options thereon by the Fund.
 
                                       21
<PAGE>
    RISKS OF TRANSACTIONS IN FUTURES CONTRACTS AND RELATED OPTIONS.  As stated
in the Prospectus, the Fund may sell a futures contract to protect against the
decline in the value of U.S. Government securities held by the Fund. However, it
is possible that the futures market may advance and the value of securities held
in the Fund's portfolio may decline. If this were to occur, the Fund would lose
money on the futures contracts and also experience a decline in value in its
portfolio securities. However, while this could occur for a very brief period or
to a very small degree, over time the market prices of the securities of a
diversified portfolio will tend to move in the same direction as the prices of
futures contracts.
 
    If the Fund purchases a futures contract to hedge against the increase in
value of U.S. Government securities it intends to buy, and the value of such
securities decreases, then the Fund may determine not to invest in the
securities as planned and will realize a loss on the futures contract that is
not offset by a reduction in the price of the securities.
 
    In order to assure that the Fund is entering into transactions in futures
contracts for hedging purposes as such is defined by the Commodities Futures
Trading Commission either: (1) a substantial majority (i.e., approximately 75%)
of all anticipatory hedge transactions (transactions in which the Fund does not
own at the time of the transaction, but expects to acquire, the securities
underlying the relevant futures contract) involving the purchase of futures
contracts will be completed by the purchase of securities which are the subject
of the hedge, or (2) the underlying value of all long positions in futures
contracts will not exceed the total value of (a) all short-term debt obligations
held by the Fund; (b) cash held by the Fund; (c) cash proceeds due to the Fund
on investments within thirty days; (d) the margin deposited on the contracts;
and (e) any unrealized appreciation in the value of the contracts.
 
    If the Fund maintains a short position in a futures contract or has sold a
call option on a futures contract, it will cover this position by holding, in a
segregated account maintained at its Custodian, cash, U.S. Government securities
or other high grade debt obligations equal in value (when added to any initial
or variation margin on deposit) to the market value of the securities underlying
the futures contract or the exercise price of the option. Such a position may
also be covered by owning the securities underlying the futures contract, or by
holding a call option permitting the Fund to purchase the same contract at a
price no higher than the price at which the short position was established.
 
    In addition, if the Fund holds a long position in a futures contract or has
sold a put option on a futures contract, it will hold cash, U.S. Government
securities or other liquid portfolio securities equal to the purchase price of
the contract or the exercise price of the put option (less the amount of initial
or variation margin on deposit) in a segregated account maintained for the Fund
by its Custodian. Alternatively, the Fund could cover its long position by
purchasing a put option on the same futures contract with an exercise price as
high or higher than the price of the contract held by the Fund.
 
    Exchanges limit the amount by which the price of a futures contract may move
on any day. If the price moves equal the daily limit on successive days, then it
may prove impossible to liquidate a futures position until the daily limit moves
have ceased. In the event of adverse price movements, the Fund would continue to
be required to make daily cash payments of variation margin on open futures
positions. In such situations, if the Fund has insufficient cash, it may have to
sell portfolio securities to meet daily variation margin requirements at a time
when it may be disadvantageous to do so. In addition, the Fund may be required
to take or make delivery of the instruments underlying interest rate futures
contracts it holds at a time when it is disadvantageous to do so. The inability
to close out options and futures positions could also have an adverse impact on
the Fund's ability to effectively hedge its portfolio.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in futures or options thereon, the Fund could experience delays
and/or losses in liquidating open positions purchased or sold through the broker
and/or incur a loss of all or part of its margin deposits with the broker.
Similarly, in the event of the bankruptcy of the writer of an OTC option
purchased by the Fund, the Fund could experience a loss of all or part of the
value of the option. Transactions are entered into by the Fund only with broker
or financial institutions deemed creditworthy by the Investment Manager.
 
                                       22
<PAGE>
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk which may arise in employing futures contracts to protect against
the price volatility of portfolio securities is that the prices of securities
subject to futures contracts (and thereby the futures contract prices) may
correlate imperfectly with the behavior of the cash prices of the Fund's
portfolio securities. Another such risk is that prices of interest rate futures
contracts may not move in tandem with the changes in prevailing interest rates
against which the Fund seeks a hedge. A correlation may also be distorted by the
fact that the futures market is dominated by short-term traders seeking to
profit from the difference between a contract or security price objective and
their cost of borrowed funds. Such distortions are generally minor and would
diminish as the contract approached maturity. There may exist an imperfect
correlation between the price movements of futures contracts purchased by the
Fund and the movements in the prices of the securities which are the subject of
the hedge. If participants in the futures market elect to close out their
contracts through offsetting transactions rather than meet margin deposit
requirements, distortions in the normal relationships between the debt
securities and futures market could result. Price distortions could also result
if investors in futures contracts opt to make or take delivery of underlying
securities rather than engage in closing transactions due to the resultant
reduction in the liquidity of the futures market. In addition, due to the fact
that, from the point of view of speculators, the deposit requirements in the
futures markets are less onerous than margin requirements in the cash market,
increased participation by speculators in the futures market could cause
temporary price distortions. Due to the possibility of price distortions in the
futures market and because of the imperfect correlation between movements in the
prices of U.S. Government securities and movements in the prices of futures
contracts, a correct forecast of interest rate trends by the Investment Manager
may still not result in a successful hedging transaction.
 
    There is no assurance that a liquid secondary market will exist for futures
contracts and related options in which the Fund may invest. In the event a
liquid market does not exist, it may not be possible to close out a futures
position, and in the event of adverse price movements, the Fund would continue
to be required to make daily cash payments of variation margin. In addition,
limitations imposed by an exchange or board of trade on which futures contracts
are traded may compel or prevent the Fund from closing out a contract which may
result in reduced gain or increased loss to the Fund. The absence of a liquid
market in futures contracts might cause the Fund to make or take delivery of the
underlying securities at a time when it may be disadvantageous to do so.
 
    Compared to the purchase or sale of futures contracts, the purchase of call
or put options on futures contracts involves less potential risk to the Fund
because the maximum amount at risk is the premium paid for the options (plus
transaction costs). However, there may be circumstances when the purchase of a
call or put option on a futures contract would result in a loss to the Fund
notwithstanding that the purchase or sale of a futures contract would not result
in a loss, as in the instance where there is no movement in the prices of the
futures contracts or underlying U.S. Government securities.
 
    The Investment Manager has substantial experience in the use of the
investment techniques described above under the heading "Options and Futures
Transactions," which techniques require skills different from those needed to
select the portfolio securities underlying various options and futures
contracts.
 
PORTFOLIO TURNOVER
 
    The Fund 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. As a result, the Fund's portfolio turnover rate may exceed 100%
(although it is not anticipated to do so). A 100% turnover rate would occur, for
example, if 100% of the securities held in the Fund's portfolio (excluding all
securities whose maturities at acquisition were one year or less) were sold and
replaced within one year.
 
                                       23
<PAGE>
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    In addition to the investment restrictions enumerated in the Prospectus, the
investment restrictions listed below have been adopted by the Fund as
fundamental policies, except as otherwise indicated. Under the Act, a
fundamental policy 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% or more of the shares present at a
meeting of shareholders, if the holders of 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.
 
    The Fund may not:
 
         1. Invest in securities of any issuer if, to the knowledge of the Fund,
    any officer or trustee/director of the Fund or of the Investment Manager
    owns more than 1/2 of 1% of the outstanding securities of such issuer, and
    such officers and trustees/directors who own more than 1/2 of 1% own in the
    aggregate more than 5% of the outstanding securities of such issuer.
 
         2. Purchase or sell real estate or interests therein, although the Fund
    may purchase securities of issuers which engage in real estate operations
    and securities secured by real estate or interests therein.
 
         3. Purchase oil, gas or other mineral leases, rights or royalty
    contracts, or exploration or development programs, except that the Fund may
    invest in the securities of companies which operate, invest in, or sponsor
    such programs.
 
         4. Purchase securities of other investment companies, except in
    connection with a merger, consolidation, reorganization or acquisition of
    assets.
 
         5. Issue senior securities as defined in the Act, except insofar as the
    Fund may be deemed to have issued a senior security by reason of: (a)
    entering into any reverse repurchase agreement; (b) borrowing money; or (c)
    purchasing any securities on a when-issued, delayed delivery or forward
    commitment basis.
 
         6. Make loans of money or securities, except: (a) by the purchase of
    publicly distributed debt obligations in which the Fund may invest
    consistent with its investment objectives and policies; (b) by investment in
    repurchase or reverse purchase agreements; or (c) by lending its portfolio
    securities.
 
         7. Engage in the underwriting of securities, except insofar as the Fund
    may be deemed an underwriter under the Securities Act of 1933 in disposing
    of a portfolio security.
 
         8. Invest for the purpose of exercising control or management of any
    other issuer.
 
         9. Invest 25% or more of the value of its total assets in securities of
    issuers in any one industry. This restriction does not apply to obligations
    issued or guaranteed by the United States Government or its agencies or
    instrumentalities.
 
        10. Make short sales of securities or maintain a short position, unless
    at all times when a short position is open it owns an equal amount of such
    securities or securities convertible into or exchangeable, without payment
    of any further consideration, for securities of the same issue as, and equal
    in amount to, the securities sold short, and unless not more than 10% of the
    Fund's net assets (taken at market value) is held as collateral for such
    sales at any one time (it is the present intention of management to make
    such sales only for the purpose of deferring realization of gain or loss for
    Federal income tax purposes; such sales would not be made of securities
    subject to outstanding options).
 
    If a percentage restriction is adhered to at the time of investment, a later
increase or decrease in percentage resulting from a change in values of
portfolio securities or amount of total or net assets will not be considered a
violation of the foregoing restrictions.
 
                                       24
<PAGE>
   
    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 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
U.S. Government securities acting as principals. Such transactions are normally
on a net basis and do not involve payment of brokerage commissions. The cost of
securities purchased from an underwriter usually includes a commission paid by
the issuer to the underwriters; transactions with dealers normally reflect the
spread between bid and asked prices. Options and futures transactions will
usually be effected through a broker and a commission will be charged. During
the fiscal years ended October 31, 1994, 1995 and 1996, the Fund paid a total of
$104,215, $111,547 and $109,449, respectively, in 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 or 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 are 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 and
futures contracts for its portfolio is that primary consideration will 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 price and execution 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. During the
fiscal year ended October 31, 1996, the Fund did not direct the payment of any
brokerage commissions because of research services provided.
 
    The information and services received by the Investment Manager from brokers
and dealers may be of benefit to the Investment Manager in the management of
accounts of some of its other clients and may not in all cases benefit the 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 management fee paid to the Investment
Manager is not reduced by any amount that may be attributable to the value of
such services.
 
    Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect principal transactions in certain money market instruments with DWR. The
Fund will limit its transactions with DWR to U.S. Government and Government
Agency Securities, Bank Money Instruments (I.E., Certificates of Deposit and
Bankers' Acceptances) and Commercial Paper. Such transactions will be effected
with DWR only when the price available from DWR is better than that available
from other dealers.
 
                                       25
<PAGE>
   
    Consistent with the policy described above, brokerage transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through DWR and other affiliated brokers and dealers. In order for an
affiliated broker or dealer to effect portfolio transactions for the Fund, the
commissions, fees or other remuneration received by the affiliated broker or
dealer must be reasonable and fair compared to the commissions, fees or other
remuneration paid to other brokers in connection with comparable transactions
involving similar securities being purchased or sold on an exchange during a
comparable period of time. This standard would allow the affiliated broker or
dealer to receive no more than the remuneration which would be expected to be
received by an unaffiliated broker in a commensurate arm's-length transaction.
Furthermore, the Trustees of the 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 an
affiliated broker or dealer are consistent with the foregoing standard. During
the fiscal years ended October 31, 1994, 1995 and 1996, the Fund paid a total of
$10,971, $9,495 and $8,477, respectively, in brokerage commissions to DWR. The
Fund does not reduce the management fee it pays to the Investment Manager by any
amount of the brokerage commissions it may pay to an affiliated broker or
dealer. During the fiscal year ended October 31, 1996, the brokerage commissions
paid to DWR represented approximately 7.74% of the total brokerage commissions
paid by the Fund during the year and were paid on account of transactions having
an aggregate dollar value equal to approximately 9.73% of the aggregate dollar
value of all portfolio transactions of the Fund during the year for which
commissions were paid. In addition, during the fiscal years ended October 31,
1994, 1995 and 1996, the Fund paid DWR $81,776, $80,741 and $69,669,
respectively, for clearing options and futures transactions.
    
 
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 of the
Fund, including a majority of 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 June 30, 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. The current Distribution Agreement
is substantively identical to the Fund's previous distribution agreements. By
its terms, the Distribution Agreement had 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 it may incur 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 to prospective shareholders. The Fund bears
the costs of initial typesetting, printing and distribution of prospectuses and
supplements thereto to shareholders. The Fund bears the costs of registering the
Fund and its shares under federal and state 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 judgement or mistake of law or for
any act of omission or for any losses sustained by the Fund or its shareholders.
    
 
                                       26
<PAGE>
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 0.85% of the average daily net assets of Class A and
Class C, respectively, and, with respect to Class B, 0.85% 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 Class B. The Distributor also
receives the proceeds of front-end sales charges and 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 $822,000, $750,000 and $641,000 in contingent deferred
sales charges for the fiscal years ended October 31, 1994, 1995 and 1996,
respectively.
    
 
   
    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 0.20% of the average daily net assets of Class B
and 0.25% of the average daily net assets of Class C are currently each
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.
    
 
    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 December 15, 1986 and
by the shareholders holding a majority, as defined in the Act, of the
outstanding voting securities of the Fund at a Special Meeting of Shareholders
of the Fund held on May 31, 1988.
 
   
    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 an internal reorganization 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 June 30, 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 under the Plan and the purpose for
which such expenditures were made. The Fund accrued amounts payable
 
                                       27
<PAGE>
   
to the Distributor under the Plan, during the fiscal year ended October 31,
1996, of $6,554,450. This amount is equal to 0.85% of the Fund's average daily
net assets for the fiscal year and was calculated pursuant to clause (b) of the
compensation formula 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.
    
 
   
    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 0.85% of the current value of
the respective accounts for which they are the account executives of record.
    
 
   
    With respect to Class D shares other than shares held by participants in
InterCapital's 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
    
 
                                       28
<PAGE>
   
promotion of Fund 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 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 $6,554,450 accrued under the Plan for the fiscal
year ended October 31, 1996 to the Distributor. The Distributor and DWR estimate
that they have spent, pursuant to the Plan, $176,271,676 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) 2.44% ($4,301,263) -- advertising and
promotional expenses; (ii) 0.23% ($400,898) -- printing of prospectuses for
distribution to other than current shareholders; and (iii) 97.33% ($171,569,515)
- -- other expenses, including the gross sales credit and the carrying charge, of
which 17.10% ($29,336,832) represents carrying charges, 33.44% ($57,376,664)
represents commission credits to DWR branch offices for payments of commissions
to account executives and 49.46% ($84,856,019) 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 0.85%, 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 distribution 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 $27,489,031 as of October 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
    
 
                                       29
<PAGE>
   
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, DWR, DWSC 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 April 30, 1987 and will
continue from year to year thereafter, provided such continuance is app roved
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 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 therein.
    
 
   
    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 debt 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. Listed options are valued at the latest sale
price on the exchange on which they are listed unless no sales of such options
have taken place that day, in which case they will be valued at the mean between
their latest bid and asked prices. Unlisted options are valued at the mean
between their latest bid and asked prices. Futures are valued at the latest sale
price on the commodities exchange on which they trade unless the Trustees
determine such price does not reflect their market value, in which case they
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.
 
   
    As stated in the Prospectus, the Investment Manager will compute the Fund's
net asset value per share for each Class of shares once daily at 4:00 p.m. New
York time (or, on days when the New York
    
 
                                       30
<PAGE>
   
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; Reverend Dr. Martin Luther
King, Jr. 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
shares of the Fund and/or other Dean Witter Funds that are multiple class funds
("Dean Witter Multi-Class Funds") or shares of other Dean Witter Funds sold with
a front-end sales charge purchased at a price including a front-end sales charge
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.
    
 
   
    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 shares owned by the investor in any other Dean Witter Funds
    
 
                                       31
<PAGE>
   
held by the shareholder which were previously purchased at a price including a
front-end sales charge (including shares of the Fund and other Dean Witter Funds
acquired in exchange for those shares, and including in each case shares
acquired through reinvestment of dividends and distributions) will be added to
the cost or net asset value of shares of the Fund owned by the investor.
However, shares of "Exchange Funds" (see "Shareholder Services--Exchange
Privilege") and the purchase of shares of other Dean Witter Funds will not be
included in determining whether the stated goal of a Letter of Intent has been
reached.
    
 
   
    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 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 (three) 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,
    
 
                                       32
<PAGE>
   
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>
                                        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>
    
 
   
    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>
                                        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>
    
 
   
    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.
    
 
   
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
    
 
                                       33
<PAGE>
   
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 applicable Class 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 should 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 Federal Securities Trust or in another Class of Dean
Witter Federal 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 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 distribution may invest such dividend or distribution in shares of
the applicable Class 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 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 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.
    
 
                                       34
<PAGE>
    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 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 concurrently with purchases of additional
shares may be inadvisable because of the sales charges which may be applicable
to purchases or redemptions of shares (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.
    
 
   
    DIRECT INVESTMENTS THROUGH TRANSFER AGENT.  As discussed in the Prospectus,
shareholders may make additional investments in any Class of shares of the Fund
for which they qualify at any time by sending a check in any amount, not less
than $100, payable to Dean Witter Federal Securities Trust, and indicating the
selected Class, 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 any 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.
    
 
                                       35
<PAGE>
   
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 a Dean Witter
Multi-Class 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 a Dean Witter Multi-Class Fund or
in a CDSC Fund. However, in the case of shares exchanged into an Exchange Fund
on or after April 23, 1990, upon a redemption of shares which results in a CDSC
being imposed, a credit (not to exceed the amount of the CDSC) will be given in
an amount equal to the Exchange Fund 12b-1 distribution fees incurred on or
after that date which are attributable to those shares. Shareholders acquiring
shares of an Exchange Fund pursuant to this exchange privilege may exchange
those shares back into a Dean Witter Multi-Class Fund or 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 a Dean Witter
Multi-Class Fund or of a CDSC Fund are reacquired. A CDSC is imposed only upon
an ultimate redemption, based upon the time (calculated as described above) the
shareholder was invested in a Dean Witter Multi-Class 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 a Dean Witter Multi-Class Fund or in a
CDSC Fund are exchanged for shares of a 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
    
 
                                       36
<PAGE>
   
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. With
respect to exchanges, redemptions or repurchases, the Transfer Agent shall be
liable for its own negligence and not for the default or negligence of its
correspondents or for losses in transit. The 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, although those funds may, in 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 U.S. Treasury Trust,
although that fund, in 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
Exchange Funds 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
 
                                       37
<PAGE>
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.
 
    For further information regarding the Exchange Privilege, shareholders
should contact their DWR or other selected broker-dealer account executive or
the Transfer Agent.
 
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 will 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.
    
 
   
    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 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 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
    
 
                                       38
<PAGE>
   
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
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 the reinstatement request, together with such
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 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 pay federal income
tax thereon, and will notify shareholders that, following an election by the
Fund, the shareholders will be required to include the amount of such
undistributed gains in determining their taxable income and will be able to
claim their share of the tax paid by the Fund as a credit against their 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 the sales of securities by the Fund will generally 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 capital 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.
 
                                       39
<PAGE>
    One of the requirements for the Fund to remain qualified as a regulated
investment company is that less than 30% of its gross income be derived from
gains from the sale or other disposition of securities held for less than three
months. Accordingly, the Fund may be restricted in the writing of options on
securities held for less than three months, in the writing of options which
expire in less than three months, and in effecting closing transactions with
respect to call or put options which have been written or purchased less than
three months prior to such transactions. The Fund may also be restricted in its
ability to engage in transactions involving futures contracts.
 
    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 or 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.
 
    In computing net investment income, the Fund will not amortize premiums or
accrue discounts on fixed-income securities in the portfolio, except those
original issue discounts for which amortization is required for federal income
tax purposes. Additionally, with respect to market discounts on bonds, a portion
of any capital gain realized upon disposition will be characterized as taxable
ordinary income in accordance with the provisions of the Internal Revenue Code.
Realized gains and losses on security transactions are determined on the
identified cost method.
 
    Any dividend or capital gains distribution received by a shareholder from
any 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 dividend or distribution record date.
 
    OPTIONS AND FUTURES.  Exchange-traded futures contracts, listed options on
futures contracts and listed options on U.S. Government securities are
classified as "Section 1256" contracts under the Code. The character of gain or
loss resulting from the sale, disposition, closing out, expiration or other
termination of Section 1256 contracts is generally treated as long-term capital
gain or loss to the extent of 60 percent thereof and short-term capital gain or
loss to the extent of 40 percent thereof. Section 1256 contracts are also
required to be marked-to-market at the end of the Fund's fiscal year, for
purpose of Federal income tax calculations. These rules may be different if
these transactions represent straddles for tax purposes.
 
    Over-the-counter options are not classified as Section 1256 contracts and
are not subject to the mark-to-market or 60 percent-40 percent taxation rules.
When call options written, or put options purchased, by the Fund are exercised,
the gain or loss realized on the sales of the underlying securities may be
either short-term or long-term, depending upon the holding period of the
securities. In determining the amount of gain or loss, the sales proceeds are
reduced by the premium paid for over-the-counter puts or increased by the
premium received for over-the-counter calls.
 
                                       40
<PAGE>
    If the Fund holds a U.S. Government security which is offset by a Section
1256 contract, the Fund would be deemed to hold a "mixed straddle" position, as
such is defined in the Code. The Fund may elect to identify its mixed straddle
positions and thereby avoid the application of certain rules which could, in
certain circumstances, cause deferral or disallowance of losses, change
long-term capital gains into short-term gains, or change short-term capital
losses into long-term capital losses.
 
    Whether the portfolio security constituting part of the identified mixed
straddle is deemed to have been held for less than three months for purposes of
determining qualification of the Fund as a regulated investment company will be
determined generally by the actual holding period of the security, without
regard to the recognition of gain or loss upon entering into the mixed straddle.
This recognition of unrealized gain or loss will be taken into account, however,
in determining the amount of income available for the Fund's quarterly
distributions, and can result in an amount which is greater or less than the
Fund's net realized gains being available for distribution. If an amount which
is less than the Fund's net realized gains is available for distribution, the
Fund may elect to distribute more than such available amount, up to the full
amount of such net realized gains. Such a distribution may, in part, constitute
a return of capital to the shareholders.
 
    If the Fund does not elect to identify a mixed straddle, no recognition of
gain or loss on the U.S. Government securities in the Fund's portfolio will
result when the mixed straddle is entered into. However, any losses realized on
the straddle will be governed by a number of tax rules which might, under
certain circumstances, defer or disallow the losses in whole or in part, change
long-term gains into short-term gains, or change short-term losses into
long-term losses. A deferral or disallowance of recognition of a realized loss
may result in an amount being available for the Fund's quarterly distributions
which is greater than the Fund's net realized gains.
 
    After the end of the calendar year, shareholders will be sent full
information on their dividends and capital gains distributions for tax purposes,
including information as to the portion taxable as ordinary income, the portion
taxable as long-term capital gains and any portion treated as a non-taxable
return of capital. Any such return of capital will reduce the shareholders' tax
basis in their shares. 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 their accuracy.
 
    Shareholders are urged to consult their attorneys or tax advisers regarding
specific questions as to federal, state or local taxes.
 
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
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 maximum offering price 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 October 31, 1996, the Fund's
yield, calculated pursuant to the formula described above, was 5.92%. 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
 
                                       41
<PAGE>
   
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 fiscal year ended October 31, 1996, for the five
years ended October 31, 1996 and for the period from March 31, 1987
(commencement of operations) through October 31, 1996 were -1.08%, 6.06% and
7.31%, 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 imposition of the maximum front-end sales charge for Class A
or the deduction of the CDSC for each of Class B and Class C 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 contingent deferred sales charge. Based on
this calculation, the average annual total returns of the Fund for the fiscal
year ended October 31, 1996, for the five years ended October 31, 1996 and for
the period from March 31, 1987 (commencement of operations) through October 31,
1996 were 3.79%, 6.37% and 7.31%, 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 sales charge) by the initial $1,000
investment and subtracting 1 from the result. Based on the foregoing
calculation, the Fund's total returns for the fiscal year ended October 31,
1996, for the five years ended October 31, 1996 and for the period from March
31, 1987 (commencement of operations) through October 31, 1996 were 3.79%,
36.17% and 96.61%, respectively. 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
$9,575, $48,250 and $97,250 in the case of Class A (investments of $10,000,
$50,000 and $100,000 adjusted for the initial sales charge) or by $10,000,
$50,000 and $100,000 in the case of each of Class B, Class C and Class D, as the
case may be. Investments of $10,000, $50,000 and $100,000 in the Fund at
inception would have grown to $19,661, $98,305 and $196,610, respectively, at
October 31, 1996. This information is for Class B only; there were no other
Classes of shares outstanding on such date.
    
 
    The Fund may advertise, from time to time, 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 Trustees themselves have the power to
alter the number and the terms of office of the Trustees, and they may at any
time lengthen or shorten their own terms or make their terms of unlimited
duration and appoint their own successors, provided that always at least a
majority of the Trustees has been elected by the shareholders of the Fund. Under
certain circumstances,
    
 
                                       42
<PAGE>
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. The Trustees have not presently 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 or
the Trustees.
 
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 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 October 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 Trustees.
 
                                       43
<PAGE>
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
   
    Barry Fink, Esq., who is an officer and the General Counsel of the
Investment Manager, is an officer and the General Counsel of the Fund.
    
 
EXPERTS
- --------------------------------------------------------------------------------
 
    The financial statements of the Fund for the year ended October 31, 1996
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.
 
                                       44
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF DEAN WITTER FEDERAL 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 Federal Securities
Trust (the "Fund") at October 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 nine years in the
period then ended and for the period March 31, 1987 (commencement of operations)
through October 31, 1987, 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 October 31, 1996 by correspondence with the
custodian and brokers, provide a reasonable basis for the opinion expressed
above.
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
DECEMBER 13, 1996
 
                                       45
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS OCTOBER 31, 1996
 
<TABLE>
<CAPTION>
 PRINCIPAL                           DESCRIPTION
 AMOUNT IN                               AND                                COUPON
 THOUSANDS                          MATURITY DATE                            RATE          VALUE
- ------------------------------------------------------------------------------------------------------
<C>          <S>                                                          <C>         <C>
             U.S. GOVERNMENT & AGENCY OBLIGATIONS (72.7%)
 $  38,323   Federal National Mortgage Assoc. (5.2%)
               Principal Strips 12/20/01 - 03/09/02.....................       7.56-
                                                                               7.89++% $     37,816,609
                                                                                      ----------------
             U.S. Treasury Bonds (61.7%)
    20,000   11/15/15...................................................       9.875        26,790,800
    22,000   11/15/12...................................................      10.375        28,517,940
   221,600   08/15/13...................................................      12.00+       319,192,640
    45,000   11/15/11...................................................      14.00         69,775,200
                                                                                      ----------------
                                                                                           444,276,580
                                                                                      ----------------
             U.S. Treasury Notes (4.3%)
    10,000   01/31/99...................................................       5.00          9,834,700
    21,000   02/28/97...................................................       6.75         21,097,020
                                                                                      ----------------
                                                                                            30,931,720
                                                                                      ----------------
             U.S. Treasury Strips (1.5%)
    20,000   11/15/06...................................................       0.00         10,479,800
                                                                                      ----------------
             TOTAL U.S. GOVERNMENT & AGENCY OBLIGATIONS
             (IDENTIFIED COST $495,284,570).........................................       523,504,709
                                                                                      ----------------
             MORTGAGE-BACKED SECURITIES (25.2%)
             Federal Home Loan Mortgage Corp. (6.2%)
    26,315   10/01/10 - 02/01/20........................................       9.50         28,173,048
    11,965   09/01/15 - 10/01/19........................................      10.00         12,997,494
     2,817   01/01/16 - 10/01/18........................................      10.50          3,102,038
                                                                                      ----------------
                                                                                            44,272,580
                                                                                      ----------------
             Federal National Mortgage Assoc. (7.0%)
    17,465   10/01/23 - 12/01/23........................................       6.50         16,712,351
     5,000   *..........................................................       7.50          5,000,000
    16,399   05/01/24 - 06/01/25........................................       8.00         16,732,324
     9,154   01/01/22 - 04/01/25........................................       8.50          9,465,813
     2,089   09/01/16 - 05/01/20........................................       9.50          2,247,811
       193   03/01/16 - 02/01/18........................................       9.75            208,871
                                                                                      ----------------
                                                                                            50,367,170
                                                                                      ----------------
             Government National Mortgage Assoc. (12.0%)
    34,573   12/15/22 - 05/15/24........................................       7.00         33,913,556
    32,378   06/15/17 - 10/15/26........................................       7.50         32,479,613
    17,789   10/15/19 - 10/15/24........................................       8.50         18,467,127
     1,232   05/15/16 - 11/15/20........................................      10.00          1,350,733
       279   09/15/18...................................................      11.00            311,491
                                                                                      ----------------
                                                                                            86,522,520
                                                                                      ----------------
             TOTAL MORTGAGE-BACKED SECURITIES
             (IDENTIFIED COST $177,658,116).........................................       181,162,270
                                                                                      ----------------
             SHORT-TERM INVESTMENTS (a) (0.9%)
             U.S. GOVERNMENT & AGENCY OBLIGATIONS
     3,650   Federal Home Loan Mortgage Corp. 11/01/96..................       5.53          3,650,000
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       46
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS OCTOBER 31, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL                           DESCRIPTION
 AMOUNT IN                               AND                                COUPON
 THOUSANDS                          MATURITY DATE                            RATE          VALUE
- ------------------------------------------------------------------------------------------------------
<C>          <S>                                                          <C>         <C>
 $   3,000   U.S. Treasury Bill 12/05/96................................       4.86%  $      2,986,244
                                                                                      ----------------
             TOTAL SHORT-TERM INVESTMENTS
             (AMORTIZED COST $6,636,244)............................................         6,636,244
                                                                                      ----------------
             TOTAL INVESTMENTS
             (IDENTIFIED COST $679,578,930).........................................       711,303,223
                                                                                      ----------------
                                                                                      ----------------
</TABLE>
 
<TABLE>
<CAPTION>
                                    DESCRIPTION,
 NUMBER OF                         EXPIRATION DATE
 CONTRACTS                        AND STRIKE PRICE                                        VALUE
- -----------------------------------------------------------------------------------------------------
<C>          <S>                                                          <C>        <C>
             WRITTEN OPTIONS (b) (0.2%)
             Call options on Treasury bond futures
       395   December/1996/110.....................................................        (1,252,890)
         2   March/1997/118........................................................            (1,469)
                                                                                     ----------------
             (Premiums Received $319,426)..........................................        (1,254,359)**
                                                                                     ----------------
                                                                                     ----------------
</TABLE>
 
<TABLE>
<CAPTION>
                                    DESCRIPTION,
 NUMBER OF                          DELIVERY YEAR
 CONTRACTS                            AND MONTH                                           VALUE
- -----------------------------------------------------------------------------------------------------
<C>          <S>                                                          <C>        <C>
             FINANCIAL FUTURES (c) (0.0%)
             SHORT POSITIONS
       100   U.S. Treasury Bonds December/1996.....................................           (40,625)**
                                                                                     ----------------
                                                                                     ----------------
TOTAL INVESTMENTS
(IDENTIFIED COST $679,578,930) (D)..........       98.8%   711,303,223
 
TOTAL WRITTEN OPTIONS OUTSTANDING...........       (0.2)    (1,254,359)
 
TOTAL FINANCIAL FUTURES.....................       (0.0)       (40,625)
 
CASH AND OTHER ASSETS IN EXCESS OF
LIABILITIES.................................        1.4      9,926,475
                                                  -----   ------------
NET ASSETS..................................      100.0%  $719,934,714
                                                  -----   ------------
                                                  -----   ------------
<FN>
- ---------------------
 *   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.
**   The market value of U.S. Treasury securities pledged to cover written
     options on futures and open futures contracts is $93,626,000.
 +   Some or all of these securities are segregated in connection with open
     written options.
++   Currently zero coupon bond and will pay interest at the rate shown at a
     future specified date.
(a)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(b)  Options expire one month prior to the expiration date indicated for the
     Treasury bond futures.
(c)  Value represents variation margin on open futures contract at October 31,
     1996. The market value of these futures contracts is $11,300,000 and the
     unrealized depreciation is $397,762.
(d)  The aggregate cost of investments for federal income tax purposes is
     $679,928,774 approximates identified cost. The aggregate gross unrealized
     appreciation was $33,629,125 and the aggregate gross unrealized
     depreciation was $2,254,676, resulting in net unrealized appreciation of
     $31,374,449.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       47
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
OCTOBER 31, 1996
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $679,578,930)............................  $711,303,223
Cash........................................................        44,345
Receivable for:
    Interest................................................    12,392,805
    Shares of beneficial interest sold......................     3,868,924
    Principal paydowns......................................       575,991
    Written options.........................................         1,519
Prepaid expenses and other assets...........................        35,498
                                                              ------------
 
     TOTAL ASSETS...........................................   728,222,305
                                                              ------------
 
LIABILITIES:
Written call options outstanding, at value
  (premiums received $319,426)..............................     1,254,359
Payable for:
    Investments purchased...................................     5,005,729
    Shares of beneficial interest repurchased...............       680,892
    Plan of distribution fee................................       514,618
    Investment management fee...............................       332,988
    Dividends to shareholders...............................       232,333
    Variation margin........................................        40,625
Accrued expenses and other payables.........................       226,047
                                                              ------------
 
     TOTAL LIABILITIES......................................     8,287,591
                                                              ------------
 
NET ASSETS:
Paid-in-capital.............................................   758,548,301
Net unrealized appreciation.................................    30,391,597
Accumulated net realized loss...............................   (69,005,184)
                                                              ------------
 
     NET ASSETS.............................................  $719,934,714
                                                              ------------
                                                              ------------
 
NET ASSET VALUE PER SHARE,
  77,810,417 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED
  OF $.01 PAR VALUE)........................................
                                                                     $9.25
                                                              ------------
                                                              ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       48
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED OCTOBER 31, 1996
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME.............................................  $ 60,470,091
                                                              ------------
 
EXPENSES
Plan of distribution fee....................................     6,554,450
Investment management fee...................................     4,241,115
Transfer agent fees and expenses............................       646,969
Custodian fees..............................................        88,907
Professional fees...........................................        82,493
Shareholder reports and notices.............................        76,674
Registration fees...........................................        56,660
Trustees' fees and expenses.................................        13,024
Other.......................................................        17,402
                                                              ------------
 
     TOTAL EXPENSES.........................................    11,777,694
                                                              ------------
 
     NET INVESTMENT INCOME..................................    48,692,397
                                                              ------------
 
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain (loss) on:
    Investments.............................................     3,976,396
    Futures contracts.......................................      (810,600)
    Options written.........................................     2,610,307
                                                              ------------
 
     NET GAIN...............................................     5,776,103
Net change in unrealized appreciation.......................   (27,386,862)
                                                              ------------
 
     NET LOSS...............................................   (21,610,759)
                                                              ------------
 
NET INCREASE................................................  $ 27,081,638
                                                              ------------
                                                              ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       49
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                               FOR THE YEAR      FOR THE
                                                                  ENDED        YEAR ENDED
                                                               OCTOBER 31,     OCTOBER 31,
                                                                   1996           1995
- ------------------------------------------------------------------------------------------
<S>                                                           <C>              <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income.......................................  $   48,692,397   $53,936,004
Net realized gain (loss)....................................       5,776,103   (11,074,215)
Net change in unrealized appreciation/depreciation..........     (27,386,862)  79,255,121
                                                              --------------   -----------
 
     NET INCREASE...........................................      27,081,638   122,116,910
 
Dividends from net investment income........................     (48,174,964)  (53,936,003)
Net decrease from transactions in shares of beneficial
  interest..................................................     (88,216,435)  (79,663,066)
                                                              --------------   -----------
 
     NET DECREASE...........................................    (109,309,761)  (11,482,159)
 
NET ASSETS:
Beginning of period.........................................     829,244,475   840,726,634
                                                              --------------   -----------
 
     END OF PERIOD
    (INCLUDING DISTRIBUTIONS IN EXCESS OF NET INVESTMENT
    INCOME OF $0 AND $517,433, RESPECTIVELY)................  $  719,934,714   $829,244,475
                                                              --------------   -----------
                                                              --------------   -----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       50
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1996
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter Federal 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 to
earn a high level of current income. The Fund commenced operations on March 31,
1987.
 
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) listed options
are valued at the latest sale price on the exchange on which they are listed
unless no sales of such options have taken place that day, in which case they
will be valued at the mean between their latest bid and asked price; (3) futures
contracts are valued at the latest sale price as of the close of the commodities
exchange on which they trade unless the Trustees determine that such price does
not reflect their market value, in which case they will be valued at fair value
as determined by the Trustees; (4) when market quotations are not readily
available, including circumstances under which it is determined by the
Investment Manager that the sale or bid prices are not reflective of a
securities 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 (5) short-term debt securities having a
maturity date of more than sixty days at the 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 debt 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.
 
C. OPTIONS AND FUTURES -- (1) Written options on debt obligations: When the Fund
writes a call or put option, an amount equal to the premium received is included
in the Fund's Statement of Assets and
 
                                       51
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1996, CONTINUED
 
Liabilities as a liability which is subsequently marked-to-market to reflect the
current market value. If a written option either expires or the Fund enters into
a closing purchase transaction, the Fund realizes a gain or loss without regard
to any unrealized gain or loss on the underlying security and the liability
related to such option is extinguished. If a written call option is exercised,
the Fund realizes a gain or loss from the sale of the underlying security and
the proceeds from such sale are increased by the premium originally received. If
a written put option is exercised, the amount of the premium originally received
reduces the cost of the security which the Fund purchases upon exercise of the
option; (2) Purchased options on debt obligations: When the Fund purchases a
call or put option, the premium paid is recorded as an investment which is
subsequently marked-to-market to reflect the current market value. If a
purchased option expires, the Fund will realize a loss to the extent of the
premium paid. If the Fund enters into a closing sale transaction, a gain or loss
is realized for the difference between the proceeds from the sale and the cost
of the option. If a put option is exercised, the cost of the security sold upon
exercise will be increased by the premium originally paid. If a call option is
exercised, the cost of the security purchased upon exercise will be increased by
the premium originally paid; (3) Options on futures contracts: The Fund is
required to deposit U.S. Government securities or other liquid portfolio
securities as "initial margin" and "variation margin" with respect to written
call and put options on futures contracts. If a written option expires, the Fund
realizes a gain. If a written call or put option is exercised, the premium
received will decrease or increase the unrealized loss or gain on the futures
contract. If the Fund enters into a closing purchase transaction, the Fund
realizes a gain or loss without regard to any unrealized gain or loss on the
underlying futures contract and the liability related to such option is
extinguished; (4) Futures contracts: A futures contract is an agreement between
two parties to buy and sell financial instruments at a set price on a future
date. Upon entering into such a contract, the Fund is required to pledge to the
broker cash or U.S. Government securities equal to the minimum initial margin
requirements of the applicable futures exchange. Pursuant to the contract, the
Fund agrees to receive from or pay to the broker an amount of cash equal to the
daily fluctuation in the value of the contract. Such receipts or payments known
as variation margin are recorded by the Fund as unrealized gains or losses. Upon
closing of the contract, the Fund realizes a gain or loss equal to the
difference between the value of the contract at the time it was opened and the
value at the time it was closed.
 
D. 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.
 
                                       52
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1996, CONTINUED
 
E. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends and
distributions to its shareholders on the ex-dividend 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 Dean Witter InterCapital
Inc. (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: 0.55% to the portion of daily net assets not exceeding $1 billion; 0.525%
to the portion of daily net assets exceeding $1 billion but not exceeding $1.5
billion; 0.50% to the portion of daily net assets exceeding $1.5 billion but not
exceeding $2 billion; 0.475% to the portion of daily net assets exceeding $2
billion but not exceeding $2.5 billion; 0.45% to the portion of daily net assets
exceeding $2.5 billion but not exceeding $5 billion; 0.425% to the portion of
daily net assets exceeding $5 billion but not exceeding $7.5 billion; 0.40% to
the portion of daily net assets exceeding $7.5 billion but not exceeding $10
billion; 0.375% to the portion of daily net assets exceeding $10 billion but not
exceeding $12.5 billion; and 0.35% 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 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.
 
                                       53
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1996, CONTINUED
 
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 0.85% 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. ("DWR"), 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 the 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, totaled
$27,489,031 at October 31, 1996.
 
The Distributor has informed the Fund that for the year ended October 31, 1996,
it received approximately $641,000 in contingent deferred sales charges from
certain redemptions of the Fund's shares.
 
                                       54
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1996, CONTINUED
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
Purchases and sales/prepayments of portfolio securities, excluding short-term
investments, for the year ended October 31, 1996 were $70,321,976 and
$178,385,209, respectively.
 
Transactions in written options for the year ended October 31, 1996 were as
follows:
 
<TABLE>
<CAPTION>
                                                     CONTRACTS    PREMIUMS
                                                    -----------  -----------
<S>                                                 <C>          <C>
Option contracts written, outstanding at beginning
 of the period....................................         600   $   330,674
Options written...................................      15,220     9,801,255
Options closed....................................     (13,823 )  (8,855,465)
Options exercised.................................      (1,100 )    (811,684)
Options expired...................................        (500 )    (145,354)
                                                    -----------  -----------
Option contracts written, outstanding at end of
 the period.......................................         397   $   319,426
                                                    -----------  -----------
                                                    -----------  -----------
</TABLE>
 
For the year ended October 31, 1996, the Fund incurred $8,477 and $69,669 in
brokerage commissions for transactions executed and for clearing options and
futures transactions, respectively, with DWR on behalf of the Fund.
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At October 31, 1996, the Fund had
transfer agent fees and expenses payable of approximately $62,000.
 
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 October 31, 1996 included
in Trustees' fees and expenses in the Statement of Operations amounted to
$1,285. At October 31, 1996, the Fund had an accrued pension liability of
$49,062 which is 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                FOR THE YEAR
                                                              ENDED                       ENDED
                                                         OCTOBER 31, 1996            OCTOBER 31, 1995
                                                    --------------------------  --------------------------
                                                      SHARES        AMOUNT        SHARES        AMOUNT
                                                    -----------  -------------  -----------  -------------
<S>                                                 <C>          <C>            <C>          <C>
Sold..............................................    7,874,713  $  73,758,124    9,811,932  $  88,420,535
Reinvestment of dividends.........................    2,866,940     26,598,740    3,274,181     29,717,628
                                                    -----------  -------------  -----------  -------------
                                                     10,741,653    100,356,864   13,086,113    118,138,163
Repurchased.......................................  (20,297,114)  (188,573,299) (21,931,274)  (197,801,229)
                                                    -----------  -------------  -----------  -------------
Net decrease......................................   (9,555,461) $ (88,216,435)  (8,845,161) $ (79,663,066)
                                                    -----------  -------------  -----------  -------------
                                                    -----------  -------------  -----------  -------------
</TABLE>
 
                                       55
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS OCTOBER 31, 1996, CONTINUED
 
6. FEDERAL INCOME TAX STATUS
 
At October 31, 1996, the Fund had an approximate net capital loss carryover of
$58,206,000, which may be used to offset future capital gains to the extent
provided by regulations, which is available through October 31 of the following
years:
 
<TABLE>
<CAPTION>
                         AMOUNTS IN THOUSANDS
- ----------------------------------------------------------------------
   1997        1998       2000        2002        2004        TOTAL
- -----------  ---------  ---------  -----------  ---------  -----------
<S>          <C>        <C>        <C>          <C>        <C>
    $15,672  $   6,866  $   3,854  $    31,124  $     690  $    58,206
- -----------  ---------  ---------  -----------  ---------  -----------
- -----------  ---------  ---------  -----------  ---------  -----------
</TABLE>
 
At October 31, 1996, the Fund was required for Federal income tax purposes to
defer approximately $10,449,000 of realized losses on certain closed options and
futures contracts.
 
At October 31, 1996, the Fund had temporary book/tax differences primarily
attributable to capital loss deferrals on straddles and permanent book/tax
differences attributable to an expired capital loss carryover. To reflect
reclassifications arising from permanent book/tax differences for the year ended
October 31, 1996, paid-in-capital was charged and accumulated net realized loss
was credited $27,139,691.
 
7. PURPOSES OF AND RISKS RELATING TO CERTAIN FINANCIAL INSTRUMENTS
 
To hedge against adverse interest rate and market risks on portfolio positions
or anticipated positions in U.S. Government securities, or in the case of
written options, to close out long or short positions in futures contracts, the
Fund may enter into written options on interest rate futures and interest rate
futures contracts ("derivative instruments").
 
These derivative instruments involve elements of market risk in excess of the
amount reflected in the Statement of Assets and Liabilities. The Fund bears the
risk of an unfavorable change in the value of the underlying securities or
currencies.
 
At October 31, 1996, the Fund had outstanding written options on interest rate
futures and interest rate futures used to manage interest rate and market
exposure on portfolio positions or anticipated positions in U.S. Government
securities.
 
                                       56
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
   
<TABLE>
<CAPTION>
                                                                                                                  FOR THE
                                                                                                                   PERIOD
                                                                                                                 MARCH 31,
                                                                                                                   1987*
                                                  FOR THE YEAR ENDED OCTOBER 31                                   THROUGH
                   -------------------------------------------------------------------------------------------    OCTOBER
                     1996      1995      1994      1993       1992      1991      1990       1989       1988      31, 1987
- ---------------------------------------------------------------------------------------------------------------------------
 
<S>                <C>        <C>       <C>       <C>       <C>        <C>       <C>       <C>        <C>        <C>
PER SHARE OPERATING
PERFORMANCE:
 
Net asset value,
 beginning of
 period..........  $   9.49   $  8.74   $ 10.03   $  9.57   $   9.46   $  8.87   $  9.27   $   9.13   $   9.27   $ 10.00
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
 
Net investment
 income..........      0.59      0.59      0.60      0.65       0.68      0.72      0.72       0.71       0.74      0.43
 
Net realized and
 unrealized gain
 (loss)..........     (0.25)     0.75     (1.28)     0.46       0.11      0.59     (0.40)      0.34       0.08     (0.58)
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
 
Total from
 investment
 operations......      0.34      1.34     (0.68)     1.11       0.79      1.31      0.32       1.05       0.82     (0.15)
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
 
Less dividends
 and
 distributions
 from:
   Net investment
   income........     (0.58)    (0.59)    (0.61)    (0.65)     (0.68)    (0.72)    (0.72)     (0.71)     (0.74)    (0.43)
   Net realized
   gain..........     --        --        --        --         --        --        --         --         --        (0.15)
   Paid-in-capital...    --     --        --        --         --        --        --         (0.20)     (0.22)    --
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
 
Total dividends
 and
 distributions...     (0.58)    (0.59)    (0.61)    (0.65)     (0.68)    (0.72)    (0.72)     (0.91)     (0.96)    (0.58)
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
 
Net asset value,
 end of period...  $   9.25   $  9.49   $  8.74   $ 10.03   $   9.57   $  9.46   $  8.87   $   9.27   $   9.13   $  9.27
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
                   --------   -------   -------   -------   --------   -------   -------   --------   --------   ----------
 
TOTAL INVESTMENT
RETURN+..........      3.79%    15.89%    (6.92)%   12.03%      8.56%    15.26%     3.64%     12.32%      9.21%    (1.47)%(1)
 
RATIOS TO AVERAGE
NET ASSETS:
Expenses.........      1.53%     1.52%     1.52%     1.50%      1.48%     1.50%     1.54%      1.47%      1.50%     1.54%(2)
 
Net investment
 income..........      6.31%     6.53%     6.56%     6.59%      7.18%     7.79%     7.92%      7.90%      8.04%     7.76%(2)
 
SUPPLEMENTAL DATA:
Net assets, end
 of period, in
 millions........      $720      $829      $841    $1,128     $1,171    $1,252    $1,397     $1,824     $2,122    $2,067
 
Portfolio
 turnover rate...        10%        7%       18%        7%         6%    --  %++       5%        19%        44%       32%(1)
<FN>
 
- ---------------------
 *   Commencement of operations.
 +   Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
++   Less than 0.5%.
(1)  Not annualized.
(2)  Annualized.
</TABLE>
    
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       57
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS APRIL 30, 1997 (UNAUDITED)
 
<TABLE>
<CAPTION>
 PRINCIPAL                           DESCRIPTION
 AMOUNT IN                               AND                                COUPON
 THOUSANDS                          MATURITY DATE                            RATE          VALUE
- -----------------------------------------------------------------------------------------------------
<C>          <S>                                                           <C>        <C>
             U.S. GOVERNMENT OBLIGATIONS (72.0%)
             U.S. Treasury Bonds (60.4%)
 $  20,000   11/15/15....................................................      9.875% $    25,904,200
    22,000   11/15/12....................................................     10.375       27,648,500
   189,600   08/15/13....................................................     12.00+      264,232,248
    45,000   11/15/11....................................................     14.00        67,336,200
                                                                                      ---------------
                                                                                          385,121,148
                                                                                      ---------------
             U.S. Treasury Notes (7.5%)
    10,000   01/31/99....................................................      5.00         9,801,200
    31,000   05/31/97....................................................      6.75        31,028,520
     7,000   11/15/97....................................................      7.375        7,056,420
                                                                                      ---------------
                                                                                           47,886,140
                                                                                      ---------------
             U.S. Treasury Strips (4.1%)
    20,000   11/15/06....................................................      0.00        10,497,600
    30,000   02/15/07....................................................      0.00        15,442,200
                                                                                      ---------------
                                                                                           25,939,800
                                                                                      ---------------
             TOTAL U.S. GOVERNMENT OBLIGATIONS
             (IDENTIFIED COST $447,649,364).........................................      458,947,088
                                                                                      ---------------
             MORTGAGE-BACKED SECURITIES (25.7%)
             Federal Home Loan Mortgage Corp. (6.4%)
    24,487   10/01/10 - 02/01/20.........................................      9.50        26,185,465
    10,845   09/01/15 - 10/01/19.........................................     10.00        11,784,208
     2,388   01/01/16 - 10/01/18.........................................     10.50         2,630,337
                                                                                      ---------------
                                                                                           40,600,010
                                                                                      ---------------
             Federal National Mortgage Assoc. (7.5%)
    17,043   10/01/23 - 12/01/23.........................................      6.50        16,068,590
     4,913   06/01/26 - 12/01/26.........................................      7.50         4,874,348
    15,677   05/01/24 - 06/01/25.........................................      8.00        15,872,588
     8,353   01/01/22 - 04/01/25.........................................      8.50         8,616,820
     1,812   09/01/16 - 05/01/20.........................................      9.50         1,946,893
       187   03/01/16 - 02/01/18.........................................      9.75           202,813
                                                                                      ---------------
                                                                                           47,582,052
                                                                                      ---------------
             Government National Mortgage Assoc. (11.8%)
    32,930   12/15/22 - 05/15/24.........................................      7.00        31,839,543
    25,474   06/15/17 - 10/15/26.........................................      7.50        25,258,594
    16,096   10/15/19 - 10/15/24.........................................      8.50        16,624,447
     1,151   05/15/16 - 11/15/20.........................................     10.00         1,262,862
       277   09/15/18....................................................     11.00           308,028
                                                                                      ---------------
                                                                                           75,293,474
                                                                                      ---------------
             TOTAL MORTGAGE-BACKED SECURITIES
             (IDENTIFIED COST $161,650,055).........................................      163,475,536
                                                                                      ---------------
             SHORT-TERM INVESTMENTS (0.6%)
             U.S. GOVERNMENT OBLIGATION (a) (0.4%)
     3,000   U.S. Treasury Bill 05/15/97 (Amortized Cost $2,993,992).....      5.15         2,993,992
                                                                                      ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       58
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
PORTFOLIO OF INVESTMENTS APRIL 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL                           DESCRIPTION
 AMOUNT IN                               AND                                COUPON
 THOUSANDS                          MATURITY DATE                            RATE          VALUE
- -----------------------------------------------------------------------------------------------------
<C>          <S>                                                           <C>        <C>
             REPURCHASE AGREEMENT (0.2%)
 $   1,111   The Bank of New York due 05/01/97 (dated 04/30/97; proceeds
               $1,111,618; collateralized by $1,119,420 Student Loan
               Marketing Assoc. 0.00% due 08/02/99 valued at $1,133,677)
               (Identified Cost $1,111,448)..............................    5.50%    $     1,111,448
                                                                                      ---------------
 
             TOTAL SHORT-TERM INVESTMENTS
             (IDENTIFIED COST $4,105,440)...........................................        4,105,440
                                                                                      ---------------
 
             TOTAL INVESTMENTS
             (IDENTIFIED COST $613,404,859).........................................      626,528,064
                                                                                      ---------------
                                                                                      ---------------
</TABLE>
 
<TABLE>
<CAPTION>
                                     DESCRIPTION,
 NUMBER OF                         EXPIRATION DATE
 CONTRACTS                         AND STRIKE PRICE
- -----------                        ----------------
<C>          <S>                                                           <C>        <C>
             WRITTEN OPTIONS (b) (0.1%)
             Call options on Treasury bond futures
       100   June/1997/109..........................................................          (93,750)
       550   June/1997/110..........................................................         (257,813)
       300   September/1997/112.....................................................         (290,625)
                                                                                      ---------------
             (Premiums Received $448,923)...........................................         (642,188)*
                                                                                      ---------------
                                                                                      ---------------
 
TOTAL INVESTMENTS
(IDENTIFIED COST $613,404,859) (C)..........       98.3 %  626,528,064
 
TOTAL WRITTEN OPTIONS OUTSTANDING...........       (0.1)      (642,188)
 
CASH AND OTHER ASSETS IN EXCESS OF
LIABILITIES.................................        1.8     11,510,745
                                                  -----   ------------
 
NET ASSETS..................................      100.0 % $637,396,621
                                                  -----   ------------
                                                  -----   ------------
<FN>
- ---------------------
 *   The market value of U.S. Treasury securities pledged to cover written
     options on futures and open futures contracts is $90,585,950.
 +   Some or all of these securities are segregated in connection with open
     written options.
(a)  Security was purchased on a discount basis.The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  Options expire one month prior to the expiration date indicated for the
     Treasury bond futures.
(c)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $18,519,107 and the
     aggregate gross unrealized depreciation is $5,745,746, resulting in net
     unrealized appreciation of $12,773,361.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       59
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
APRIL 30, 1997 (UNAUDITED)
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $613,404,859)............................  $626,528,064
Cash........................................................       157,380
Receivable for:
    Interest................................................    12,215,466
    Investments sold........................................     4,987,500
    Principal paydowns......................................       554,275
    Shares of beneficial interest sold......................       457,364
    Written options.........................................        80,633
Prepaid expenses and other assets...........................        67,269
                                                              ------------
 
     TOTAL ASSETS...........................................   645,047,951
                                                              ------------
 
LIABILITIES:
Written call options outstanding, at value(premiums received
  $448,923).................................................       642,188
Payable for:
    Investments purchased...................................     5,013,281
    Shares of beneficial interest repurchased...............       841,326
    Plan of distribution fee................................       445,513
    Investment management fee...............................       288,273
    Dividends to shareholders...............................       231,143
Accrued expenses and other payables.........................       189,606
                                                              ------------
 
     TOTAL LIABILITIES......................................     7,651,330
                                                              ------------
 
NET ASSETS:
Paid-in-capital.............................................   692,302,097
Net unrealized appreciation.................................    12,929,940
Accumulated net realized loss...............................   (67,835,416)
                                                              ------------
 
     NET ASSETS.............................................  $637,396,621
                                                              ------------
                                                              ------------
 
NET ASSET VALUE PER SHARE,
  70,555,768 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED
  OF $.01 PAR VALUE)........................................
                                                                     $9.03
                                                              ------------
                                                              ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       60
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED APRIL 30, 1997 (UNAUDITED)
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
 
INTEREST INCOME.............................................  $ 26,950,692
                                                              ------------
 
EXPENSES
Plan of distribution fee....................................     2,881,040
Investment management fee...................................     1,864,202
Transfer agent fees and expenses............................       284,618
Custodian fees..............................................        44,733
Professional fees...........................................        38,437
Shareholder reports and notices.............................        29,529
Registration fees...........................................        18,611
Trustees' fees and expenses.................................         7,429
Other.......................................................        13,406
                                                              ------------
 
     TOTAL EXPENSES.........................................     5,182,005
                                                              ------------
 
     NET INVESTMENT INCOME..................................    21,768,687
                                                              ------------
 
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain (loss) on:
    Investments.............................................     1,241,327
    Futures contracts.......................................      (755,981)
    Options written.........................................       684,422
                                                              ------------
 
     NET GAIN...............................................     1,169,768
 
     NET CHANGE IN UNREALIZED APPRECIATION..................   (17,461,657)
                                                              ------------
 
     NET LOSS...............................................   (16,291,889)
                                                              ------------
 
NET INCREASE................................................  $  5,476,798
                                                              ------------
                                                              ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       61
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                                 FOR THE YEAR
                                                                FOR THE SIX         ENDED
                                                                MONTHS ENDED     OCTOBER 31,
                                                               APRIL 30, 1997        1996
- ---------------------------------------------------------------------------------------------
<S>                                                           <C>                <C>
                                                                (UNAUDITED)
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income.......................................    $ 21,768,687     $ 48,692,397
Net realized gain...........................................       1,169,768        5,776,103
Net change in unrealized appreciation.......................     (17,461,657)     (27,386,862)
                                                              ----------------   ------------
 
     NET INCREASE...........................................       5,476,798       27,081,638
 
Dividends from net investment income........................     (21,768,687)     (48,174,964)
Net decrease from transactions in shares of beneficial
  interest..................................................     (66,246,204)     (88,216,435)
                                                              ----------------   ------------
 
     NET DECREASE...........................................     (82,538,093)    (109,309,761)
 
NET ASSETS:
Beginning of period.........................................     719,934,714      829,244,475
                                                              ----------------   ------------
 
     END OF PERIOD..........................................    $637,396,621     $719,934,714
                                                              ----------------   ------------
                                                              ----------------   ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       62
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS APRIL 30, 1997 (UNAUDITED)
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter Federal 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 to
earn a high level of current income. The Fund commenced operations on March 31,
1987.
 
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) listed options
are valued at the latest sale price on the exchange on which they are listed
unless no sales of such options have taken place that day, in which case they
are valued at the mean between their latest bid and asked price; (3) futures
contracts are valued at the latest sale price as of the close of the commodities
exchange on which they trade unless the Trustees determine that such price does
not reflect their market value, in which case it will be valued at fair value as
determined by the Trustees; (4) when market quotations are not readily
available, including circumstances under which it is determined by Dean Witter
InterCapital Inc. (the "Investment Manager") that the 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 (5) short-term debt
securities having a maturity date of more than sixty days at the 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 debt 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.
 
                                       63
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS APRIL 30, 1997 (UNAUDITED) CONTINUED
 
C. OPTIONS AND FUTURES -- (1) Written options on debt obligations: When the Fund
writes a call or put option, an amount equal to the premium received is included
in the Fund's Statement of Assets and Liabilities as a liability which is
subsequently marked-to-market to reflect the current market value. If a written
option either expires or the Fund enters into a closing purchase transaction,
the Fund realizes a gain or loss without regard to any unrealized gain or loss
on the underlying security and the liability related to such option is
extinguished. If a written call option is exercised, the Fund realizes a gain or
loss from the sale of the underlying security and the proceeds from such sale
are increased by the premium originally received. If a written put option is
exercised, the amount of the premium originally received reduces the cost of the
security which the Fund purchases upon exercise of the option; (2) Purchased
options on debt obligations: When the Fund purchases a call or put option, the
premium paid is recorded as an investment which is subsequently marked-to-market
to reflect the current market value. If a purchased option expires, the Fund
will realize a loss to the extent of the premium paid. If the Fund enters into a
closing sale transaction, a gain or loss is realized for the difference between
the proceeds from the sale and the cost of the option. If a put option is
exercised, the cost of the security sold upon exercise will be increased by the
premium originally paid. If a call option is exercised, the cost of the security
purchased upon exercise will be increased by the premium originally paid; (3)
Option on futures contracts: The Fund is required to deposit cash, U.S.
Government securities or other liquid portfolio securities as "initial margin"
and "variation margin" with respect to written call and put options on futures
contracts. If a written option expires, the Fund realizes a gain. If a written
call or put option is exercised, the premium received will decrease or increase
the unrealized loss or gain on the futures contract. If the Fund enters into a
closing purchase transaction, the Fund realizes a gain or loss without regard to
any unrealized gain or loss on the underlying futures contract and the liability
related to such option is extinguished; (4) Futures contracts: A futures
contract is an agreement between two parties to buy and sell financial
instruments at a set price on a future date. Upon entering into such a contract,
the Fund is required to pledge to the broker cash, U.S. Government securities or
other liquid portfolio securities equal to the minimum initial margin
requirements of the applicable futures exchange. Pursuant to the contract, the
Fund agrees to receive from or pay to the broker an amount of cash equal to the
daily fluctuation in the value of the contract. Such receipts or payments known
as variation margin are recorded by the Fund as unrealized gains or losses. Upon
closing of the contract, the Fund realizes a gain or loss equal to the
difference between the value of the contract at the time it was opened and the
value at the time it was closed.
 
D. 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.
 
                                       64
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS APRIL 30, 1997 (UNAUDITED) CONTINUED
 
E. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends and
distributions to its shareholders on the ex-dividend 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 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: 0.55% to the portion of daily net assets not exceeding $1 billion;
0.525% to the portion of daily net assets exceeding $1 billion but not exceeding
$1.5 billion; 0.50% to the portion of daily net assets exceeding $1.5 billion
but not exceeding $2 billion; 0.475% to the portion of daily net assets
exceeding $2 billion but not exceeding $2.5 billion; 0.45% to the portion of
daily net assets exceeding $2.5 billion but not exceeding $5 billion; 0.425% to
the portion of daily net assets exceeding $5 billion but not exceeding $7.5
billion; 0.40% to the portion of daily net assets exceeding $7.5 billion but not
exceeding $10 billion; 0.375% to the portion of daily net assets exceeding $10
billion but not exceeding $12.5 billion; and 0.35% 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 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
 
                                       65
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS APRIL 30, 1997 (UNAUDITED) CONTINUED
 
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 0.85% 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. ("DWR"), an affiliate of the Investment Manager and
Distributor, and others 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 utilize fees paid
pursuant to the Plan 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 distribution expenses.
 
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 the investors upon redemption of
shares, if for any reason the Plan is terminated, the Trustees will consider at
the time the manner in which to treat such expenses. The Distributor has advised
the Fund that such excess amounts, including carrying charges, totaled
$25,995,060 at April 30, 1997.
 
The Distributor has informed the Fund that for the six months ended April 30,
1997, it received approximately $275,000 in contingent deferred sales charges
from certain redemptions of the Fund's shares.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
Purchases and sales/prepayments of portfolio securities, excluding short-term
investments, for the six months ended April 30, 1997 were $40,778,206 and
$123,983,824, respectively.
 
                                       66
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS APRIL 30, 1997 (UNAUDITED) CONTINUED
 
Transactions in written options for the six months ended April 30, 1997 were as
follows:
 
<TABLE>
<CAPTION>
                                                    CONTRACTS    PREMIUMS
                                                    ---------   -----------
<S>                                                 <C>         <C>
Option contracts written, outstanding at beginning
 of the period....................................       397    $   319,426
Options written...................................     5,400      3,233,005
Options closed....................................    (4,252)    (2,583,710)
Options exercised.................................      (595)      (519,798)
                                                    ---------   -----------
Option contracts written, outstanding at end of
 the period.......................................       950    $   448,923
                                                    ---------   -----------
                                                    ---------   -----------
</TABLE>
 
For the six months ended April 30, 1997, the Fund incurred $11,350 and $27,034
in brokerage commissions for transactions executed and for clearing options and
futures transactions, respectively, with DWR on behalf of the Fund.
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At April 30, 1997, the Fund had
transfer agent fees and expenses payable of approximately $60,000.
 
The Fund has 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 six months ended April 30, 1997
included in Trustees' fees and expenses in the Statement of Operations amounted
to $1,168. At April 30, 1997, the Fund had an accrued pension liability of
$48,650 which is 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 SIX
                                                           MONTHS ENDED
                                                          APRIL 30, 1997               FOR THE YEAR
                                                    --------------------------            ENDED
                                                                                     OCTOBER 31, 1996
                                                           (UNAUDITED)          --------------------------
                                                      SHARES        AMOUNT        SHARES        AMOUNT
                                                    -----------  -------------  -----------  -------------
<S>                                                 <C>          <C>            <C>          <C>
Sold..............................................    3,233,202  $  29,614,724    7,874,713  $  73,758,124
Reinvestment of dividends.........................    1,286,978     11,731,012    2,866,940     26,598,740
                                                    -----------  -------------  -----------  -------------
                                                      4,520,180     41,345,736   10,741,653    100,356,864
Repurchased.......................................  (11,774,829)  (107,591,940) (20,297,114)  (188,573,299)
                                                    -----------  -------------  -----------  -------------
Net decrease......................................   (7,254,649) $ (66,246,204)  (9,555,461) $ (88,216,435)
                                                    -----------  -------------  -----------  -------------
                                                    -----------  -------------  -----------  -------------
</TABLE>
 
                                       67
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS APRIL 30, 1997 (UNAUDITED) CONTINUED
 
6. FEDERAL INCOME TAX STATUS
 
At October 31, 1996, the Fund had a net capital loss carryover of approximately
$58,206,000, which may be used to offset future capital gains to the extent
provided by regulations, which is available through October 31 in the following
years:
 
<TABLE>
<CAPTION>
                  AMOUNTS IN THOUSANDS
- ---------------------------------------------------------
   1997        1998       2000        2002        2004
- -----------  ---------  ---------  -----------  ---------
<S>          <C>        <C>        <C>          <C>
    $15,672  $   6,866  $   3,854  $    31,124  $     690
- -----------  ---------  ---------  -----------  ---------
- -----------  ---------  ---------  -----------  ---------
</TABLE>
 
At October 31, 1996, the Fund was required for Federal income tax purposes to
defer approximately $10,449,000 of realized losses on certain closed options and
futures contracts.
 
As of October 31, 1996, the Fund had temporary book/tax differences primarily
attributable to capital loss deferrals on straddles.
 
7. PURPOSES OF AND RISKS RELATING TO CERTAIN FINANCIAL INSTRUMENTS
 
To hedge against adverse interest rate and market risks on portfolio positions
or anticipated positions in U.S. Government securities, or in the case of
written options, to close out long or short positions in futures contracts, the
Fund may enter into written options on interest rate futures and interest rate
futures contracts ("derivative instruments").
 
These derivative instruments involve elements of market risk in excess of the
amount reflected in the Statement of Assets and Liabilities. The Fund bears the
risk of an unfavorable change in the value of the underlying securities or
currencies.
 
At April 30, 1997, the Fund had outstanding written options on interest rate
futures used to manage interest rate and market exposure on portfolio positions
or anticipated positions in U.S. Government securities. At April 30, 1997, the
Fund had no outstanding interest rate futures.
 
                                       68
<PAGE>
DEAN WITTER FEDERAL SECURITIES TRUST
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
   
<TABLE>
<CAPTION>
                                                                                                              FOR THE PERIOD
                                                         FOR THE YEAR ENDED OCTOBER 31                       MARCH 31, 1987*
                                     ----------------------------------------------------------------------      THROUGH
                      FOR THE SIX    1996    1995    1994     1993    1992    1991    1990    1989    1988   OCTOBER 31, 1987
                      MONTHS ENDED
                       APRIL 30,
                          1997
                      (UNAUDITED)
 
 ---------------------------------------------------------------------------------------------------------------------------
 
<S>                   <C>            <C>    <C>     <C>      <C>     <C>     <C>     <C>     <C>     <C>     <C>
PER SHARE OPERATING PERFORMANCE:
 
Net asset value,
 beginning of
 period.............    $  9.25      $9.49   $8.74   $10.03   $9.57   $9.46   $8.87   $9.27   $9.13   $9.27         10.00
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
Net investment
 income.............       0.29       0.59    0.59     0.60    0.65    0.68    0.72    0.72    0.71    0.74          0.43
 
Net realized and
 unrealized gain
 (loss).............     (0.22)      (0.25)   0.75    (1.28)   0.46    0.11    0.59   (0.40)   0.34    0.08        (0.58)
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
Total from
 investment
 operations.........       0.07       0.34    1.34    (0.68)   1.11    0.79    1.31    0.32    1.06    0.82        (0.15)
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
Less dividends and
 distributions from:
 
Net investment
 income.............      (0.29)     (0.58)  (0.59)   (0.61)  (0.65)  (0.68)  (0.72)  (0.72)  (0.71)  (0.74)        (0.43)
 
Net realized gain...     --           --      --      --       --      --      --      --      --      --           (0.15)
 
Paid-in-capital.....     --           --      --      --       --      --      --      --     (0.20)  (0.22)      --
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
Total dividends and
 distributions......      (0.29)     (0.58)  (0.59)   (0.61)  (0.65)  (0.68)  (0.72)  (0.72)  (0.91)  (0.96)        (0.58)
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
Less dividends from
 net investment
 income.............     (0.29)      (0.58)  (0.59)   (0.61)  (0.65)  (0.68)  (0.72)  (0.72)  (0.71)  (0.74)       (0.43)
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
Net asset value, end
 of period..........    $  9.03      $9.25   $9.49    $8.74  $10.03   $9.57   $9.46    8.87   $9.27   $9.13      $   9.27
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
                      ------------   -----  ------  -------  ------  ------  ------  ------  ------  ------  ----------------
 
TOTAL INVESTMENT
RETURN+.............   0.79%(1)      3.79%  15.89%  (6.92)%  12.03%   8.56%  15.26%   3.64%  12.32%   9.21%    (1.47)%(1)
 
RATIOS TO AVERAGE
NET ASSETS:
Expenses............   1.53%(2)      1.53%   1.52%    1.52%   1.50%   1.48%   1.50%   1.54%   1.47%   1.50%      1.54%(2)
Net investment
 income.............   6.42%(2)      6.31%   6.53%    6.56%   6.59%   7.18%   7.79%   7.92%   7.90%   8.04%      7.76%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of
 period, in
 millions...........       $637       $720    $829     $841  $1,128  $1,171  $1,252  $1,397   1,824  $2,122        $2,067
 
Portfolio turnover
 rate...............      6%(1)        10%      7%      18%      7%      6%   --%++      5%     19%     44%        32%(1)
<FN>
 
- ------------------------
 *   Commencement of operations.
 +   Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
(1)  Not annualized.
(2)  Annualized.
</TABLE>
    
 
                    SEE NOTES TO FINANCIAL STATEMENTS
 
                                       69
<PAGE>
APPENDIX
- --------------------------------------------------------------------------------
 
RATINGS OF CORPORATE DEBT INSTRUMENTS
                                      BONDS
 
    The four highest ratings of Moody's Investors Service, Inc. ("Moody's") for
corporate bonds are Aaa, Aa, A and Baa, all of which are considered investment
grade. Bonds rated Aaa are judged to be of the "best quality". The rating of Aa
is assigned to bonds which are of "high quality by all standards", but as to
which margins of protection or other elements make long-term risks appear
somewhat larger than Aaa rated bonds. The Aaa and Aa rated bonds comprise what
are generally known as "high grade bonds". Bonds which are rated A by Moody's
possess many favorable investment attributes and are considered "upper medium
grade obligations". Bonds rated Baa are considered "medium grade" obligations.
They are neither highly protected nor poorly secured. Interest payments and
principal security appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well. Moody's applies numerical
modifiers, 1, 2, and 3, in each rating classification for Aa and below. The
modifier 1 indicates that the security ranks in the higher end of its category;
the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates that
the issue ranks in the lower end of its category. The foregoing ratings are
sometimes presented in parentheses preceded with a "con" indicating that the
bonds are rated conditionally. Bonds, the security for which depends upon the
completion of some act or the fulfillment of some condition, are rated
conditionally. These are bonds secured by (a) earnings of projects under
construction, (b) earnings of projects when facilities are completed, or (c)
payments to which some other limiting condition attaches. Such parenthetical
rating denotes the probable credit stature upon completion of construction or
elimination of the basis of the condition.
 
    The four highest ratings of Standard & Poor's Corporation ("Standard &
Poor's") for bonds are AAA, AA, A and BBB, all of which are considered
investment grade. Bonds rated AAA bear the highest rating assigned by Standard &
Poor's to a debt obligation, and the rating indicates an extremely strong
capacity to pay interest and repay principal. Bonds rated AA also qualify as
high-quality debt obligations. Capacity to pay interest and repay principal is
very strong, and in the majority of instances they differ from AAA issues only
in small degree. Bonds rated A have strong capacity to pay interest and repay
principal although they are somewhat more susceptible to the adverse effects of
changes in circumstances and economic conditions. The BBB rating, which is the
lowest "investment grade" security rating by Standard & Poor's, indicates an
adequate capacity to repay principal and pay interest. Whereas they normally
exhibit adequate protection parameters, adverse economic conditions or changing
circumstances are more likely to lead to a weakened capacity to pay principal
and interest for bonds in this category than for bonds in the A category. The
ratings of AA and below may be modified by the addition of a plus or minus sign
to show relative standing within the major rating categories. The foregoing
ratings are sometimes followed by a "p" which indicates that the rating is
provisional. A provisional rating assumes the successful completion of the
project being financed by the bonds being rated and indicates that payment of
debt service requirements is largely or entirely dependent upon the successful
and timely completion of the project. This rating, however, while addressing
credit quality subsequent to completion of the project, makes no comment on the
likelihood or risk of default upon failure of such completion.
 
                                COMMERCIAL PAPER
 
    Moody's Commercial Paper ratings are opinions of the ability of issuers to
repay punctually promissory obligations not having an original maturity in
excess of nine months. Moody's employs the following three designations, all
judged to be investment grade, to indicate the relative repayment capacity of
rated issuers: Prime-1, Highest Quality; Prime-2, Higher Quality; and Prime-3,
High Quality.
 
    Standard & Poor's commercial paper rating is a current assessment of the
likelihood of timely payment of debt having an original maturity of no more than
365 days. The commercial paper rating is
 
                                       70
<PAGE>
not a recommendation to purchase or sell a security. The ratings are based upon
current information furnished by the issuer or obtained by S&P from other
sources it considers reliable. The ratings may be changed, suspended, or
withdrawn as a result of changes in or unavailability of such information.
 
    Ratings are graded into four categories, ranging from "A" for the highest
quality obligations to "D" for the lowest. Issues assigned A ratings are
regarded as having the greatest capacity for timely payment. Issues in this
category are further refined with the designations 1, 2, and 3 to indicate the
relative degree of safety. The "A-1+" and "A-1" designations indicate that the
degree of safety regarding timely payment is very strong.
 
                                       71
<PAGE>

                        DEAN WITTER FEDERAL 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 period March 31, 1987 
         through October 31, 1987 and for the years 
         ended October 31, 1988, 1989, 1990, 1991, 1992,
         1993, 1994, 1995 and 1996 and for the six months 
         ended April 30, 1997 (unaudited). . . . . . . . . . .             6

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

         Portfolio of Investments at October 31, 1996. . . . .            46

         Statement of Assets and Liabilities at 
         October 31, 1996. . . . . . . . . . . . . . . . . . .            48

         Statement of Operations for the year ended 
         October 31, 1996  . . . . . . . . . . . . . . . . . .            49

         Statement of Changes in Net Assets for the
         years ended October 31, 1995 and 1996 . . . . . . . .            50

         Notes to Financial Statements at October 31, 1996 . .            51

         Financial Highlights for the period March 31, 1987
         through October 31, 1987 and for the years 
         ended October 31, 1988, 1989, 1990, 1991, 1992, 1993,
         1994, 1995 and 1996 . . . . . . . . . . . . . . . . .            57

         Portfolio of Investments at April 30, 1997 
         (unaudited) . . . . . . . . . . . . . . . . . . . . .            58

         Statement of Assets and Liabilities at 
         April 30, 1997 (unaudited). . . . . . . . . . . . . .            60
 
         Statement of Operations for the six months ended 
         April 30, 1997 (unaudited). . . . . . . . . . . . . .            61

         Statement of Changes in Net Assets for the year
         ended October 31, 1996 and for the six months ended 
         April 30, 1997 (unaudited). . . . . . . . . . . . . .            62

<PAGE>

         Notes to Financial Statements at April 30, 1997 
         (unaudited) . . . . . . . . . . . . . . . . . . . . .            63

         Financial Highlights for the period March 31, 1987
         through October 31, 1987 and the years ended 
         October 31, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
         1995 and 1996 and for the six months ended 
         April 30, 1997 (unaudited)  . . . . . . . . . . . . .            69

         (3) Financial statements included in Part C:

         None


          (b)  EXHIBITS:


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

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

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

               6.(b)  --  Form of Multiple-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.

               27.    --  Financial Data Schedule.

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

          All other exhibits previously filed and 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 June 30, 1997
     --------------                     ------------------------
Shares of Beneficial Interest                    37,710


                                          2
<PAGE>

Item 27.  INDEMNIFICATION.

     Pursuant to Section 5.3 of the Registrant's Declaration of Trust and under
Section 4.8 of the Registrant's By-Laws, the indemnification of the Registrant's
trustees, officers, employees and agents is permitted if it is determined that
they acted under the belief that their actions were in or not opposed to the
best interest of the Registrant, and, with respect to any criminal proceeding,
they had reasonable cause to believe their conduct was not unlawful.  In
addition, indemnification is permitted only if it is determined that the actions
in question did not render them liable by reason of willful misfeasance, bad
faith or gross negligence in the performance of their duties or by reason of
reckless disregard of their obligations and duties to the Registrant.  Trustees,
officers, employees and agents will be indemnified for the expense of litigation
if it is determined that they are entitled to indemnification against any
liability established in such litigation.  The Registrant may also advance money
for these expenses provided that they give their undertakings to repay the
Registrant unless their conduct is later determined to permit indemnification.


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

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


                                          3
<PAGE>

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

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

Item 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.

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

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

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


                                          4
<PAGE>

(20) InterCapital Quality Municipal Securities
(21) InterCapital New York Quality Municipal Securities
(22) InterCapital California Quality Municipal Securities
(23) InterCapital Insured California Municipal Securities 
(24) InterCapital Insured Municipal Securities

OPEN-END INVESTMENT COMPANIES:
 (1) Dean Witter Short-Term Bond Fund
 (2) Dean Witter Tax-Exempt Securities Trust
 (3) Dean Witter Tax-Free Daily Income Trust
 (4) Dean Witter Dividend Growth Securities Inc.
 (5) Dean Witter Convertible Securities Trust
 (6) Dean Witter Liquid Asset Fund Inc.
 (7) Dean Witter Developing Growth Securities Trust
 (8) Dean Witter Retirement Series
 (9) Dean Witter Federal Securities Trust
(10) Dean Witter World Wide Investment Trust
(11) Dean Witter U.S. Government Securities Trust
(12) Dean Witter Select Municipal Reinvestment Fund
(13) Dean Witter High Yield Securities Inc.
(14) Dean Witter Intermediate Income Securities
(15) Dean Witter New York Tax-Free Income Fund
(16) Dean Witter California Tax-Free Income Fund
(17) Dean Witter Health Sciences Trust
(18) Dean Witter California Tax-Free Daily Income Trust
(19) Dean Witter Global Asset Allocation Fund
(20) Dean Witter American Value Fund
(21) Dean Witter Strategist Fund
(22) Dean Witter Utilities Fund
(23) Dean Witter World Wide Income Trust
(24) Dean Witter New York Municipal Money Market Trust
(25) Dean Witter Capital Growth Securities
(26) Dean Witter Precious Metals and Minerals Trust
(27) Dean Witter European Growth Fund Inc.
(28) Dean Witter Global Short-Term Income Fund Inc.
(29) Dean Witter Pacific Growth Fund Inc.
(30) Dean Witter Multi-State Municipal Series Trust
(31) Dean Witter 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


                                          5
<PAGE>

(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

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

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

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


                                          6
<PAGE>

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

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

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

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

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


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

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

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

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

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


                                          7
<PAGE>

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

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

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

Richard Felegy
Senior Vice President    

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

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

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

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

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

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

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

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

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

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

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


                                          8
<PAGE>

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

Rafael Scolari           Vice President of Prime Income Trust.
Senior Vice President

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

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

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

Elizabeth A. Vetell      
Senior Vice President

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

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

Douglas Brown            
First Vice President

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

Thomas Chronert          
First Vice President

Rosalie Clough
First Vice President

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

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

David Johnson
First Vice President

Stanley Kapica
First Vice President


                                          9
<PAGE>

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

Robert Zimmerman
First Vice President

Dale Albright
Vice President

Joan G. Allman
Vice President

Andrew Arbenz
Vice President

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

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

Nancy Belza
Vice President

Dale Boettcher
Vice President

Joseph Cardwell
Vice President

Philip Casparius
Vice President

B. Catherine Connelly
Vice President

Salvatore DeSteno
Vice President           Vice President of DWSC.

Frank J. DeVito          
Vice President           Vice President of DWSC.

Bruce Dunn
Vice President

Jeffrey D. Geffen
Vice President

Deborah Genovese
Vice President

Michael Geringer
Vice President


                                          10
<PAGE>

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

Stephen Greenhut
Vice President

Peter W. Gurman
Vice President

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

Peter Hermann
Vice President           Vice President of various Dean Witter Funds

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

Christopher Jones
Vice President

James P. Kastberg
Vice President

Michelle Kaufman         
Vice President           Vice President of various Dean Witter Funds

Michael Knox
Vice President           Vice President of various Dean Witter Funds 

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

Thomas Lawlor
Vice President

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

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

Albert McGarity
Vice President

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


                                          11
<PAGE>

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

Sharon K. Milligan       
Vice President

Julie Morrone            
Vice President

Mary Beth Mueller
Vice President

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

James Nash
Vice President

Richard Norris
Vice President

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

George Paoletti
Vice President

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

Hugh Rose
Vice President

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

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

Carl F. Sadler
Vice President

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

Naomi Stein
Vice President


                                          12
<PAGE>

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

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

Marybeth Swisher
Vice President

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

Robert Vanden Assem
Vice President

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

Katherine Wickham
Vice President

Item 29.  PRINCIPAL UNDERWRITERS

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

 (1)      Dean Witter Liquid Asset Fund Inc.
 (2)      Dean Witter Tax-Free Daily Income Trust
 (3)      Dean Witter California Tax-Free Daily Income Trust
 (4)      Dean Witter Retirement Series
 (5)      Dean Witter Dividend Growth Securities Inc.
 (6)      Dean Witter Global Asset Allocation
 (7)      Dean Witter World Wide Investment Trust
 (8)      Dean Witter Capital Growth Securities 
 (9)      Dean Witter Convertible Securities Trust
(10)      Active Assets Tax-Free Trust
(11)      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


                                          13
<PAGE>

(26)      Dean Witter New York Municipal Money Market Trust
(27)      Dean Witter Intermediate Income Securities
(28)      Prime Income Trust
(29)      Dean Witter European Growth Fund Inc.
(30)      Dean Witter Developing Growth Securities Trust
(31)      Dean Witter Precious Metals and Minerals Trust
(32)      Dean Witter Pacific Growth Fund Inc.
(33)      Dean Witter Multi-State Municipal Series Trust
(34)      Dean Witter Federal Securities Trust
(35)      Dean Witter Short-Term U.S. Treasury Trust
(36)      Dean Witter Diversified Income Trust
(37)      Dean Witter Health Sciences Trust
(38)      Dean Witter Global Dividend Growth Securities
(39)      Dean Witter American Value Fund
(40)      Dean Witter U.S. Government Money Market Trust
(41)      Dean Witter Global Short-Term Income Fund Inc.
(42)      Dean Witter Value-Added Market Series
(43)      Dean Witter Global Utilities Fund
(44)      Dean Witter 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.

                                          14 

<PAGE>


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

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

     Michael T. Gregg                   Vice President and Assistant
                                        Secretary.


Item 30.  LOCATION OF ACCOUNTS AND RECORDS

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


Item 31.  MANAGEMENT SERVICES

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

Item 32.  UNDERTAKINGS

     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.

                                          15
<PAGE>


                                      SIGNATURES
                                      ----------
    Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement pursuant to
Rule 485(b) under the Securities Act of 1933 and has duly caused this
Post-Effective Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of New York
and State of New York on the 17th day of July, 1997.

                                            DEAN WITTER FEDERAL 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. 12 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                                7/17/97
    --------------------------
        Charles A. Fiumefreddo

(2) Principal Financial Officer    Treasurer and Principal
                                   Accounting Officer
                   
By  /s/ Thomas F. Caloia                                      7/17/97
    --------------------------
        Thomas F. Caloia

(3) Majority of the Trustees

    Charles A. Fiumefreddo (Chairman)
    Philip J. Purcell


By  /s/ Barry Fink                                            7/17/97
    --------------------------
        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 M. Butowsky                                     7/17/97
    --------------------------
        David M. Butowsky
        Attorney-in-Fact
<PAGE>

                                      Exhibits:


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

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

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

6.(b)    --   Form of Multiple-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.

27.      --   Financial Data Schedule.

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

<PAGE>



                                     CERTIFICATE


         The undersigned hereby certifies that he is the Secretary of Dean
Witter Federal 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 June 30,
1997, as provided in Section 6.9(h) 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 28th day of July, 1997.



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



(SEAL)


<PAGE>

                         DEAN WITTER FEDERAL SECURITIES TRUST

                       INSTRUMENT ESTABLISHING AND DESIGNATING
                             ADDITIONAL CLASSES OF SHARES

WHEREAS, Dean Witter Federal Securities Trust (the "Trust") was established by
the Declaration of Trust dated November 20, 1986, as amended from time to time
(the "Declaration"), under the laws of the Commonwealth of Massachusetts;

WHEREAS, Section 6.9(h) 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(h) 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(h) of the Declaration, all shares of the Trust
held prior to July 28, 1997 are hereby designated as Class B shares of the
Trust.

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 30th day of June, 1997.


/s/ Michael Bozic                      /s/ Manuel H. Johnson
- -----------------------------------    --------------------------------------
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



/s/ Charles A. Fiumefreddo             /s/ Michael E. Nugent
- -----------------------------------    --------------------------------------
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


/s/ Edwin J. Garn                      /s/ Philip J. Purcell
- -----------------------------------    --------------------------------------
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

/s/ John R. Haire                      /s/ John L. Schroeder
- -----------------------------------    --------------------------------------
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 30th day of June, 1997, 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.




                                                  /s/ Marilyn K. Cranney        
                                                  ------------------------------
                                                  Notary Public                 


My Commission expires:

MARILYN K. CRANNEY
NOTARY PUBLIC, STATE OF NEW YORK
NO. 24-4795538
QUALIFIED IN KINGS COUNTY
COMMISSION EXPIRES MAY 31, 1999
<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 an investment company offered with a CDSC
have been designated Class B shares and those that were acquired in exchange for
shares of an investment company 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 and for shares of certain other investment companies 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
 
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
 
                                       4

<PAGE>
                        INVESTMENT MANAGEMENT AGREEMENT
 
    AGREEMENT made as of the 31st day of May, 1997 by and between Dean Witter
Federal 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: 0.55% of daily net assets up to $1
billion; 0.525% of the next $500 million; 0.50% of the next $500 million; 0.475%
of the next $500 million; 0.45% of the next $2.5 billion; 0.425% of the next
$2.5 billion; 0.40% of the next $2.5 billion; 0.375% of the next $2.5 billion;
and 0.35% 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 Federal Securities
Trust, dated November 20, 1986, 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 Federal 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 Federal 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 Federal 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.
 

                                       DEAN WITTER FEDERAL SECURITIES TRUST
 
                                       By: /s/ Barry Fink
                                          .............................
 
Attest:
 /s/ Ruth Rossi
 .................................
 
                                       DEAN WITTER INTERCAPITAL INC.
 
                                       By: /s/ Charles A. Fiumefreddo
                                          .............................
 
Attest:
 /s/ Marilyn K. Cranney
 .................................
 
                                       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
 
          
                      
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
            
 
                                       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 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.
 
    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
 
          
                     
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
             
 
                                       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. 12 to the registration 
statement on Form N-1A (the "Registration Statement") of our report dated 
December 13, 1996, relating to the financial statements and financial 
highlights of Dean Witter Federal 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 
"Independent Accountants" and "Experts" 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
July 15, 1997


<PAGE>
                                                                 EXHIBIT 15


           AMENDED AND RESTATED PLAN OF DISTRIBUTION PURSUANT TO RULE 12b-1
                                          OF
                        DEAN WITTER FEDERAL SECURITIES TRUST 

   WHEREAS, Dean Witter Federal 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 January 22, 1987, 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 January 22, 1987, 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 0.85%, 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 

<PAGE>

such expenses. The Trustees shall determine the particular expenses, and the
portion thereof that may be borne by the Fund, and in making such determination
shall consider the scope of the Distributor's commitment to promoting the
distribution of the 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) 0.85% 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) 0.85% 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 percentage of Fund assets will not be
materially increased thereby. It is 


                                          2

<PAGE>

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 Federal Securities
Trust, dated November 20, 1986, 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 Federal
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 Federal 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 Federal 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:    January 22, 1987
         As Amended on January 4, 1993,
         April 28, 1993, October 26, 1995
         and July 28, 1997

Attest:                                DEAN WITTER FEDERAL SECURITIES TRUST

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

Attest:                                DEAN WITTER DISTRIBUTORS INC.

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

Attest:                                DEAN WITTER REYNOLDS INC.

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


                                          4

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          OCT-31-1997
<PERIOD-END>                               APR-30-1997
<INVESTMENTS-AT-COST>                      613,404,859
<INVESTMENTS-AT-VALUE>                     626,528,064
<RECEIVABLES>                               18,295,238
<ASSETS-OTHER>                                 224,649
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             645,047,951
<PAYABLE-FOR-SECURITIES>                     5,013,281
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,638,049
<TOTAL-LIABILITIES>                          7,651,330
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   692,302,097
<SHARES-COMMON-STOCK>                       70,555,768
<SHARES-COMMON-PRIOR>                       77,810,417
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                   (67,835,416)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    12,929,940
<NET-ASSETS>                               637,396,621
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           26,950,692
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               5,182,005
<NET-INVESTMENT-INCOME>                     21,768,687
<REALIZED-GAINS-CURRENT>                     1,169,768
<APPREC-INCREASE-CURRENT>                 (17,461,657)
<NET-CHANGE-FROM-OPS>                        5,476,798
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (21,768,687)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,233,202
<NUMBER-OF-SHARES-REDEEMED>               (11,774,829)
<SHARES-REINVESTED>                          1,286,978
<NET-CHANGE-IN-ASSETS>                    (82,538,093)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                 (69,005,184)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,864,202
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              5,182,005
<AVERAGE-NET-ASSETS>                       683,509,607
<PER-SHARE-NAV-BEGIN>                             9.25
<PER-SHARE-NII>                                   0.29
<PER-SHARE-GAIN-APPREC>                         (0.22)
<PER-SHARE-DIVIDEND>                            (0.29)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.03
<EXPENSE-RATIO>                                   1.53
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<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 an investment company offered with a CDSC
have been designated Class B shares and those that were acquired in exchange for
shares of an investment company 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 and for shares of certain other investment companies 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

           
                    
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
           
 
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