WITTER DEAN CONVERTIBLE SECURITIES TRUST
485BPOS, 1996-11-25
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 25, 1996
    
 
                                                     REGISTRATION NOS.:  2-97963
                                                                        811-4310
 
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- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                ----------------
 
                                   FORM N-1A
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933                     /X/
                       PRE-EFFECTIVE AMENDMENT NO.                           / /
   
                        POST-EFFECTIVE AMENDMENT NO. 12                      /X/
    
                                     AND/OR
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940                                /X/
   
                                AMENDMENT NO. 13                             /X/
    
 
                               ------------------
 
                    DEAN WITTER CONVERTIBLE 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
 
                              SHELDON CURTIS, ESQ.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
 
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)
 
   
                                    Copy to:
    
 
   
                            DAVID M. BUTOWSKY, ESQ.
                             GORDON ALTMAN BUTOWSKY
                             WEITZEN SHALOV & WEIN
                              114 WEST 47TH STREET
                            NEW YORK, NEW YORK 10036
    
 
                              -------------------
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
 
 As soon as practicable after this Post-Effective Amendment becomes effective.
 
 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)
   
        _X_ immediately upon filing pursuant to paragraph (b)
    
   
        ___ on (date) pursuant to paragraph (b)
    
        ___ 60 days after filing pursuant to paragraph (a)
        ___ on (date) pursuant to paragraph (a) of rule 485.
 
                              -------------------
 
   
    THE REGISTRANT HAS REGISTERED AN INDEFINITE NUMBER OF ITS SHARES UNDER THE
SECURITIES ACT OF 1933 PURSUANT TO SECTION (A)(1) OF RULE 24F-2 UNDER THE
INVESTMENT COMPANY ACT OF 1940. THE REGISTRANT FILED THE RULE 24F-2 NOTICE FOR
ITS FISCAL YEAR ENDED SEPTEMBER 30, 1996 WITH THE SECURITIES AND EXCHANGE
COMMISSION ON NOVEMBER 4, 1996.
    
 
           AMENDING THE PROSPECTUS AND UPDATING FINANCIAL STATEMENTS
 
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<PAGE>
                    DEAN WITTER CONVERTIBLE SECURITIES TRUST
 
                             CROSS-REFERENCE SHEET
 
                                   FORM N-1A
 
<TABLE>
<CAPTION>
ITEM                                                                           CAPTION
- ----------------------------------------------  ---------------------------------------------------------------------
<S>                                             <C>
PART A                                                                       PROSPECTUS
 1.  .........................................  Cover Page
 2.  .........................................  Prospectus Summary; Summary of Fund Expenses
 3.  .........................................  Financial Highlights; Performance Information
 4.  .........................................  Investment Objective and Policies; The Fund and Its Management, Cover
                                                 Page; Investment Restrictions; Prospectus Summary; Financial
                                                 Highlights; Appendix
 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.  .........................................  Redemptions and Repurchases; Shareholder Services
 9.  .........................................  Not applicable
 
PART B                                                           STATEMENT OF ADDITIONAL INFORMATION
10.  .........................................  Cover Page
11.  .........................................  Table of Contents
12.  .........................................  The Fund and Its Management
13.  .........................................  Investment Practices and Policies; Investment Restrictions; Portfolio
                                                 Transactions and Brokerage
14.  .........................................  The Fund and Its Management; Trustees and Officers
15.  .........................................  The Fund and Its Management; Trustees and Officers
16.  .........................................  The Fund and Its Management; The Distributor; Shareholder Services;
                                                 Custodian and Transfer Agent; Independent Accountants
17.  .........................................  Portfolio Transactions and Brokerage
18.  .........................................  Description of Shares of the Fund
19.  .........................................  The Distributor; Redemptions and Repurchases; Financial Statements;
                                                 Shareholder Services
20.  .........................................  Dividends, Distributions and Taxes; Financial Statements
21.  .........................................  The Distributor
22.  .........................................  Performance Information
23.  .........................................  Experts; Financial Statements
</TABLE>
 
PART C
 
    Information required to be included in Part C is set forth under the
appropriate item, so numbered, in Part C of this Registration Statement.
<PAGE>
   
              PROSPECTUS
              NOVEMBER 25, 1996
    
 
              Dean Witter Convertible Securities Trust (the "Fund") is an
open-end diversified management investment company whose investment objective is
to seek a high level of total return on its assets through a combination of
current income and capital appreciation. It seeks to achieve its investment
objective by investing principally in "convertible securities," that is, bonds,
notes, debentures, preferred stocks and other securities which are convertible
into common stock. INVESTORS SHOULD CAREFULLY CONSIDER THE RELATIVE RISKS OF
INVESTING IN HIGH YIELD SECURITIES, WHICH ARE COMMONLY KNOWN AS JUNK BONDS.
BONDS OF THIS TYPE ARE CONSIDERED TO BE SPECULATIVE WITH REGARD TO THE PAYMENT
OF INTEREST AND RETURN OF PRINCIPAL. INVESTORS SHOULD ALSO BE COGNIZANT OF THE
FACT THAT SUCH SECURITIES ARE NOT GENERALLY MEANT FOR SHORT-TERM INVESTING AND
SHOULD ASSESS THE RISKS ASSOCIATED WITH AN INVESTMENT IN THE FUND. (see
"Investment Objective and Policies").
 
               Shares of the Fund are continuously offered at net asset value
without the imposition of a sales charge. However, redemptions and/or
repurchases are subject in most cases to a contingent deferred sales charge,
scaled down from 5% to 1% of the amount redeemed, if made within six years of
purchase, which charge will be paid to the Fund's Distributor, Dean Witter
Distributors Inc. (See "Redemptions and Repurchases--Contingent Deferred Sales
Charge.") In addition, the Fund pays the Distributor a Rule 12b-1 distribution
fee pursuant to a Plan of Distribution at the annual rate of 1% of the lesser of
the (i) average daily aggregate net sales or (ii) average daily net assets of
the Fund. (See "Purchase of Fund Shares--Plan of Distribution.")
 
   
               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 November 25, 1996, 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/3
Financial Highlights/4
The Fund and its Management/5
Investment Objective and Policies/5
  Risk Considerations/6
Investment Restrictions/12
Purchase of Fund Shares/13
Shareholder Services/15
Redemptions and Repurchases/18
Dividends, Distributions and Taxes/20
Performance Information/21
Additional Information/22
Appendix--Ratings of Investments/23
    
 
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
    Convertible Securities Trust
    Two World Trade Center
    New York, New York 10048
    (212) 392-2550 or
    (800) 869-NEWS (toll-free)
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>                 <C>
The                 The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is an open-end
Fund                diversified management investment company investing principally in corporate securities that can be converted
                    into common stock.
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Shares Offered      Shares of beneficial interest with $0.01 par value (see page 22).
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Offering            At net asset value without sales charge (see page 13). Shares redeemed within six years of purchase are subject
Price               to a contingent deferred sales charge under most circumstances (see page 18).
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Minimum             Minimum initial investment, $1,000 ($100 if the account is opened through EasyInvestSM); minimum subsequent
Purchase            investment, $100 (see page 13).
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Investment          The investment objective of the Fund is to seek a high level of total return on its assets through a combination
Objective           of current income and capital appreciation. It seeks to achieve this objective by investing principally in
                    "convertible securities," that is bonds, notes, debentures, preferred stocks and other securities which are
                    convertible into common stock.
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Investment          Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund and its wholly-owned
Manager             subsidiary, Dean Witter Services Company Inc., serve in various investment management, advisory, management and
                    administrative capacities to 100 investment companies and other portfolios with assets of approximately $88.1
                    billion at October 31, 1996 (see page 5).
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Management          The Investment Manager receives a monthly fee at the annual rate of 0.60 of 1% of the Fund's net assets not
Fee                 exceeding $750 million, scaled down at various asset levels to 0.425 of 1% of the Fund's daily net assets
                    exceeding $3 billion, determined as of the close of each business day. (see page 5).
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Dividends and       Income dividends paid quarterly; Capital gains, if any, paid at least once per year. Dividends and capital gains
Capital Gains       distributions automatically reinvested in additional shares at net asset value (without sales charge), unless
Distributions       the shareholder elects to receive cash. (see page 20).
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Distributor         Dean Witter Distributors Inc. (the "Distributor"). The Distributor receives from the Fund a distribution fee,
                    accrued daily and payable monthly, at the rate of 1% per annum of the lesser of (i) the Fund's average daily
                    aggregate net sales or (ii) the Fund's average daily net assets. This fee compensates the Distributor for the
                    services provided in distributing shares of the Fund and for sales-related expenses. The Distributor also
                    receives the proceeds of any contingent deferred sales charges (see page 14).
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Redemption--        Shares are redeemable by the shareholder at net asset value. An account may be involuntarily redeemed if the
Contingent          total value of the account is less than $100 or, if the account was opened through EasyInvestSM, if after twelve
Deferred Sales      months the shareholder has invested less than $1,000 in the account. Although no commission or sales load is
Charge              imposed upon the purchase of shares, a contingent deferred sales charge (scaled down from 5% to 1%) is imposed
                    on any redemption of shares if after such redemption the aggregate current value of an account with the Fund
                    falls below the aggregate amount of the investor's purchase payments made during the six years preceding the
                    redemption. However, there is no charge imposed on redemption of shares purchased through reinvestment of
                    dividends or distributions (see pages 18-20).
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Tax-Sheltered       You can take advantage of tax benefits for personal retirement accounts by investing in the Fund through an IRA
Retirement          (Individual Retirement Account) or Custodial Account under Section 403(b) (7) of the Internal Revenue Code (see
Plans               page 16).
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Risks               The net asset value of the Fund's shares will fluctuate with changes in the market value of its portfolio
                    securities. Emphasis on convertible securities will result in price fluctuations of the Fund's portfolio
                    securities with varying interest rates and with changes in the prices of the common stocks associated with their
                    conversion rights. In addition, the investor is directed to the discussions of corporate fixed-income securities
                    (certain of which may be lower rated securities commonly known as "junk bonds" or securities which are unrated
                    by recognized rating agencies), when-issued and delayed delivery securities and forward commitments, when, as
                    and if issued securities, options, futures contracts, foreign securities, repurchase agreements, and options on
                    futures (see pages 6 - 11).
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</TABLE>
    
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
                                       2
<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 for the
fiscal year ended September 30, 1996.
    
 
<TABLE>
<S>                                                           <C>
SHAREHOLDER TRANSACTION EXPENSES
- ------------------------------------------------------------
Maximum Sales Charge Imposed on Purchases...................  None
Maximum Sales Charge Imposed on Reinvested Dividends........  None
Deferred Sales Charge
  (as a percentage of the lesser of original purchase price
   or redemption proceeds)..................................  5.0%
      A deferred sales charge is imposed at the following
      declining rates:
</TABLE>
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE
PAYMENT MADE                                                  PERCENTAGE
- ------------------------------------------------------------  ----------
<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>
 
   
<TABLE>
<S>                                                           <C>
Redemption Fee..............................................   None
Exchange Fee................................................   None
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE
 NET ASSETS)
- ------------------------------------------------------------
Management Fee..............................................  0.60%
12b-1 Fees*.................................................  1.00%
Other Expenses..............................................  0.29%
Total Fund Operating Expenses...............................  1.89%
<FN>
- ------------
* A PORTION OF THE 12B-1 FEE EQUAL TO 0.25% OF THE FUND'S AVERAGE DAILY NET
  ASSETS IS CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL
  ASSOCIATION OF SECURITIES DEALERS, INC. ("NASD") GUIDELINES. (SEE "PURCHASE OF
  FUND SHARES")
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                       10
EXAMPLE                                   1 year   3 years  5 years   years
- ----------------------------------------  -------  -------  -------  -------
<S>                                       <C>      <C>      <C>      <C>
You would pay the following expenses on
 a $1,000 investment, assuming (1) 5%
 annual return and (2) redemption at the
 end of each time period:...............  $   69   $   89   $  122   $  221
You would pay the following expenses on
 the same investment, assuming no
 redemption:............................  $   19   $   59   $  102   $  221
</TABLE>
    
 
    THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND 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," "Plan of Distribution" and "Redemptions and
Repurchases."
 
    Long-term shareholders of the Fund may pay more in sales charges and
distribution fees than the economic equivalent of the maximum front-end sales
charges permitted by the NASD.
 
                                       3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
   
    The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by Price Waterhouse LLP,
independent accountants. The financial highlights should be read in conjunction
with the financial statements, 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.
    
 
   
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED SEPTEMBER 30
                                ----------------------------------------------------------------------------------------
                                 1996     1995     1994     1993     1992     1991     1990     1989     1988     1987
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
<S>                             <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset value, beginning
   of period..................  $11.67   $ 10.75  $ 10.62  $  8.92  $  8.67  $  7.65  $ 9.68   $  8.63  $12.42   $ 11.22
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Net investment income.......    0.55      0.60     0.42     0.37     0.34     0.37    0.46      0.48    0.38      0.48
  Net realized and unrealized
   gain (loss)................    1.12      0.82     0.11     1.67     0.15     1.05   (2.06 )    1.20   (2.87 )    1.59
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Total from investment
   operations.................    1.67      1.42     0.53     2.04     0.49     1.42   (1.60 )    1.68   (2.49 )    2.07
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Less dividends and
   distributions from:
    Net investment income.....   (0.62 )   (0.50)   (0.40)   (0.34)   (0.24)   (0.40)  (0.43 )   (0.63)  (0.23 )   (0.46)
    Net realized gain.........     -0-       -0-      -0-      -0-      -0-      -0-     -0-       -0-   (1.07 )   (0.41)
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Total dividends and
   distributions..............   (0.62 )   (0.50)   (0.40)   (0.34)   (0.24)   (0.40)  (0.43 )   (0.63)  (1.30 )   (0.87)
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Net asset value, end of
   period.....................  $12.72   $ 11.67  $ 10.75  $ 10.62  $  8.92  $  8.67  $ 7.65   $  9.68  $ 8.63   $ 12.42
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
                                -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
TOTAL INVESTMENT RETURN+......  14.70%    13.68%    5.02%   23.22%    5.69%   18.93%  (16.93)%  20.20%  (19.79)%  19.21%
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................   1.89%     1.96%    1.93%    1.93%    1.92%    1.92%   1.88%     1.76%   1.79%     1.62%
  Net investment income.......   4.78%     5.24%    3.68%    3.44%    3.43%    4.34%   4.96%     4.93%   3.87%     3.85%
SUPPLEMENTAL DATA:
  Net assets, end of period,
   in millions................    $234      $185     $190     $208     $218     $297    $413      $822  $1,073    $2,029
  Portfolio turnover rate.....    171%      138%     184%     221%     145%     133%     92%      167%    472%      572%
  Average commission rate
   paid.......................  $0.0581       --       --       --       --       --      --        --      --        --
</TABLE>
    
 
- ------------
   
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
    
 
                                       4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Dean Witter Convertible 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 the Commonwealth of Massachusetts on May 21, 1985.
 
    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 Dean Witter, Discover & Co. ("DWDC"), a
balanced financial services organization providing a broad range of nationally
marketed credit and investment products.
 
   
    InterCapital and its wholly-owned subsidiary, Dean Witter Services Company
Inc., serve in various investment management, advisory, management and
administrative capacities to 100 investment companies, 30 of which are listed on
the New York Stock Exchange, with combined total net assets of approximately
$85.1 billion as of October 31, 1996. The Investment Manager also manages and
advises managers of portfolios of pension plans, other institutions and
individuals which aggregated approximately $3 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: 0.60% of the portion of the daily net assets not exceeding
$750 million, scaled down at various asset levels to 0.425% of the portion of
the daily net assets exceeding $3 billion. For the fiscal year ended September
30, 1996, the Fund accrued total compensation to the Investment Manager
amounting to 0.60% of the Fund's average daily net assets and the Fund's total
expenses amounted to 1.89% of the Fund's average daily net assets.
    
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
    The investment objective of the Fund is to seek a high level of total return
on its assets through a combination of current income and capital appreciation.
There is no assurance that this objective will be achieved. It is a fundamental
policy of the Fund and cannot be changed without shareholder approval. The
following policies may be changed by the Trustees of the Fund without
shareholder approval.
 
    (1) The Fund will normally invest at least 65% of its total assets (taken at
current value) in "convertible securities," i.e., securities (bonds, debentures,
corporate notes, preferred stocks and other securities) which are convertible
into common stock. Securities received upon conversion may be retained in the
Fund's portfolio to permit orderly disposition or to establish long-term holding
periods for federal income tax purposes. The Fund is
 
                                       5
<PAGE>
not required to sell these securities for the purpose of assuring that 65% of
its assets are invested in convertible securities.
 
    (2) The Fund may invest up to 35% of its total assets (taken at current
value and subject to any restrictions appearing elsewhere in this Prospectus) in
any combination and quantity of the following securities: (a) common stock; (b)
nonconvertible preferred stock; (c) nonconvertible corporate debt securities;
(d) options on debt and equity securities; (e) financial futures contracts and
related options thereon; and (f) money market instruments.
 
    (3) Notwithstanding paragraphs (1) and (2) above, when market conditions
dictate a "defensive" investment strategy, the Fund may invest without limit in
money market instruments, including commercial paper, certificates of deposit,
bankers' acceptances and other obligations of domestic banks or domestic
branches of foreign banks, or foreign branches of domestic banks, in each case
having total assets of at least $500 million, and obligations issued or
guaranteed by the United States Government, or foreign governments or their
respective instrumentalities or agencies.
 
    The Fund may invest in fixed-income securities rated Baa or lower by Moody's
Investors Service, Inc. ("Moody's"), or BBB or lower by Standard & Poor's
Corporation ("S&P"). Fixed-income securities rated Baa by Moody's or BBB by S&P
have speculative characteristics greater than those of more highly rated bonds,
while fixed-income securities rated Ba or BB or lower by Moody's and S&P,
respectively, are considered to be speculative investments. Furthermore, the
Fund does not have any minimum quality rating standard for its investments. As
such, the Fund may invest in securities rated as low as Caa, Ca or C by Moody's
or CCC, CC, C or C1 by S&P. Fixed-income securities rated Caa or Ca by Moody's
may already be in default on payment of interest or principal, while bonds rated
C by Moody's, their lowest bond rating, can be regarded as having extremely poor
prospects of ever attaining any real investment standing. Bonds rated C1 by S&P,
their lowest bond rating, are no longer making interest payments.
 
    Non-rated securities are also considered for investment by the Fund when the
Investment Manager believes that the financial condition of the issuers of such
securities, or the protection afforded by the terms of the securities
themselves, makes them appropriate investments for the Fund.
 
    A general description of Moody's and S&P's ratings is set forth in the
Appendix at the end of this Prospectus.
 
RISK CONSIDERATIONS
 
    CONVERTIBLE SECURITIES.  The Fund will seek to meet its investment objective
by investing primarily in convertible securities in accordance with the
above-stated policies. Investments in these securities can provide a high level
of total return by virtue of their affording current income through interest and
dividend payments and because of the opportunity they provide for capital
appreciation by virtue of their convertibility into common stock. The Fund may
invest in investment grade convertible securities which are rated within the
four highest categories by recognized rating agencies; i.e., S & P and Moody's,
as well as in such securities which are lower rated or which are not rated by
such agencies. See the Statement of Additional Information for a discussion of
S&P and Moody's ratings.
 
    Convertible securities rank senior to common stocks in a corporation's
capital structure and, therefore, entail less risk than the corporation's common
stock. The value of a convertible security is a function of its "investment
value" (its value as if it did not have a conversion privilege), and its
"conversion value" (the security's worth if it were to be exchanged for the
underlying security, at market value, pursuant to its conversion privilege).
 
    To the extent that a convertible security's investment value is greater than
its conversion value, its price will be primarily a reflection of such
investment value and its price will be likely to increase when
 
                                       6
<PAGE>
interest rates fall and decrease when interest rates rise, as with a
fixed-income security (the credit standing of the issuer and other factors may
also have an effect on the convertible security's value). If the conversion
value exceeds the investment value, the price of the convertible security will
rise above its investment value and, in addition, will sell at some premium over
its conversion value. (This premium represents the price investors are willing
to pay for the privilege of purchasing a fixed-income security with a
possibility of capital appreciation due to the conversion privilege.) At such
times the price of the convertible security will tend to fluctuate directly with
the price of the underlying equity security. Convertible securities may be
purchased by the Fund at varying price levels above their investment values
and/or their conversion values in keeping with the Fund's objective.
 
   
    The Fund may invest up to 25% of its total assets in "enhanced" convertible
securities. Enhanced convertible securities offer holders the opportunity to
obtain higher current income than would be available from a traditional equity
security issued by the same company, in return for reduced participation or a
cap on appreciation in the underlying common stock of the issuer which the
holder can realize. In addition, in many cases, enhanced convertible securities
are convertible into the underlying common stock of the issuer automatically at
maturity, unlike traditional convertible securities which are convertible only
at the option of the security holder. Enhanced convertible securities may be
more volatile than traditional convertible securities due to the mandatory
conversion feature.
    
 
   
    The Fund also may invest up to 10% in "synthetic" convertible securities.
Unlike traditional convertible securities whose conversion values are based on
the common stock of the issuer of the convertible security, "synthetic"
convertible securities are preferred stocks or debt obligations of an issuer
which are combined with an equity component whose conversion value is based on
the value of the common stock of a different issuer or a particular benchmark
(which may include a foreign issuer or basket of foreign stocks, or a company
whose stock is not yet publicly traded). In many cases, "synthetic" convertible
securities are not convertible prior to maturity, at which time the value of the
security is paid in cash by the issuer.
    
 
   
    "Synthetic" convertible securities may be less liquid than traditional
convertible securities and their price changes may be more volatile. Reduced
liquidity may have an adverse impact on the Fund's ability to sell particular
synthetic securities promptly at favorable prices and may also make it more
difficult for the Fund to obtain market quotations based on actual trades, for
purposes of valuing the Fund's portfolio securities.
    
 
   
    The Fund may invest without limitation in "exchangeable" convertible bonds
and convertible preferred stock which are issued by one company, but convertible
into the common stock of a different publicly traded company. These securities
generally have liquidity trading and risk characteristics similar to traditional
convertible securities noted above.
    
 
    ZERO COUPON SECURITIES.  A portion of the 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
 
                                       7
<PAGE>
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.
 
    CORPORATE FIXED-INCOME SECURITIES.  In order to generate the current income
needed to achieve its investment objective, the Fund may invest in investment
grade nonconvertible fixed-income securities as well as in such securities which
are in the lower rating categories of S & P and Moody's or which are not rated
by such agencies. Such investments may be deemed speculative in nature.
 
    The ratings of fixed-income securities by Moody's and S & P are a generally
accepted barometer of credit risk. The Investment Manager will primarily rely
upon such ratings in assessing the creditworthiness of the issuers of the
securities it purchases. Nevertheless, the Investment Manager takes into account
in its security selection process the fact that credit ratings evaluate the
safety of a security's continuing payments of principal and interest, rather
than the risk of decline in its market value. Moreover, as credit rating
agencies may fail to make timely changes in their credit ratings to reflect
changing circumstances and events, the Investment Manager will continuously
monitor the issuers of the lower-rated securities held in the Fund's portfolio
to determine whether these issuers have sufficient cash flow and profits to meet
required principal and interest payments.
 
    All fixed-income securities are subject to two types of risks: the credit
risk and the interest rate risk. The credit risk relates to the ability of the
issuer to meet interest or principal payments or both as they come due. The
interest rate risk refers to the fluctuations in net asset value of any
portfolio of fixed-income securities resulting from the inverse relationship
between price and yield of fixed-income securities; that is, when the general
level of interest rates rises, the prices of outstanding fixed-income securities
decline, and when interest rates fall, prices rise.
 
    FOREIGN SECURITIES.  The Fund may invest in securities of foreign companies.
However, the Fund will not invest more than 10% of the value of its total
assets, at the time of purchase, in foreign securities (other than securities of
Canadian issuers registered under the Securities Exchange Act of 1934 or
American Depository Receipts, on which there is no such limit). Foreign
securities investments may be affected by changes in currency rates or exchange
control regulations, changes in governmental administration or economic or
monetary policy (in the United States and abroad) or changed circumstances in
dealings between nations. Costs will be incurred in connection with conversions
between various currencies held by the Fund. Investments in foreign securities
will also occasion risks relating to political and economic developments abroad,
including the possibility of expropriations or confiscatory taxation,
limitations on the use or transfer of Fund assets and any effects of foreign
social, economic or political instability.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From
time to time, in the ordinary course of business, the Fund may purchase
securities on a when-issued or delayed delivery basis or may purchase or sell
securities on a forward commitment basis. When such transactions are negotiated,
the price is fixed at the time of the commitment, but delivery and payment can
take place 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 accrues to the purchaser during this period.
 
    WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a
"when, as and if issued" basis under which the issuance of the security depends
upon the occurrence of a subsequent event, such as approval of a merger,
corporate reorganization or debt restructuring. If the
antic-
 
                                       8
<PAGE>
ipated event does not occur and the securities are not issued, the Fund will
have lost an investment opportunity. 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, as and if issued" basis. An increase in the percentage of the Fund's
assets committed to the purchase of securities on a "when, as and if issued"
basis may increase the volatility of its net asset value.
 
    PRIVATE PLACEMENTS.  The Fund may invest up to 5% of its total assets in
securities which are subject to restrictions on resale because they have not
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), or which are otherwise not readily marketable. (Securities eligible for
resale pursuant to Rule 144A under the Securities Act, and determined to be
liquid pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.) These securities are generally referred
to as private placements or restricted securities. Limitations on the resale of
such securities may have an adverse effect on their marketability, and may
prevent the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of registering such securities for resale and the
risk of substantial delays in effecting such registration.
 
   
    The Securities and Exchange Commission has adopted Rule 144A under the
Securities Act, which permits the Fund to sell restricted securities to
qualified institutional buyers without limitation. The Investment Manager,
pursuant to procedures adopted by the Trustees of the Fund, will make a
determination as to the liquidity of each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid", such security will
not be included within the category "illiquid securities", which under current
policy may not exceed 15% of the Fund's net assets. Investing in Rule 144A
securities could have the effect of increasing the level of Fund illiquidity to
the extent the Fund, at a particular time, may be unable to find qualified
institutional buyers interested in purchasing such securities.
    
 
    INVESTMENT IN REAL ESTATE INVESTMENT TRUSTS. The Fund may invest in real
estate investment trusts, which pool investors' funds for investments primarily
in commercial real estate properties. Investment in real estate investment
trusts may be the most practical available means for the Fund to invest in the
real estate industry (the Fund is prohibited from investing in real estate
directly). As a shareholder in a real estate investment trust, the Fund would
bear its ratable share of the real estate investment trust's expenses, including
its advisory and administration fees. At the same time the Fund would continue
to pay its own investment management fees and other expenses, as a result of
which the Fund and its shareholders in effect will be absorbing duplicate levels
of fees with respect to investments in real estate investment trusts.
 
    RIGHTS AND WARRANTS.  The Fund may acquire rights and/or warrants which are
attached to other securities in its portfolio, or which are issued as a
distribution by the issuer of a security held in its portfolio. Rights and/or
warrants are, in effect, options to purchase equity securities at a specific
price, generally valid for a specific period of time, and have no voting rights,
pay no dividends and have no rights with respect to the corporation issuing
them.
 
    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 government securities or other 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 to minimize such risks. These
procedures
 
                                       9
<PAGE>
include effecting repurchase transactions only with large, well-capitalized and
well-established financial institutions and maintaining adequate
collateralization.
 
    LOWER-RATED SECURITIES.  Because of the special nature of the Fund's
investments in lower rated securities (certain lower rated securities in which
the Fund may invest are commonly known as junk bonds), the Investment Manager
must take account of certain special considerations in assessing the risks
associated with such investments. For example, as the lower rated securities
market is relatively new, its growth had paralleled a long economic expansion
and, until recently, it had not faced adverse economic and market conditions.
Therefore, an economic downturn or increase in interest rates is likely to have
a negative effect on this market and on the value of the lower rated securities
held by the Fund, as well as on the ability of the securities' issuers to repay
principal and interest on their borrowings.
 
    The prices of lower rated securities have been found to be less sensitive to
changes in prevailing interest rates than higher rated investments, but are
likely to be more sensitive to adverse economic changes or individual corporate
developments. During an economic downturn or substantial period of rising
interest rates, highly leveraged issuers may experience financial stress which
would adversely effect their ability to service their principal and interest
payment obligations, to meet their projected business goals or to obtain
additional financing. If the issuer of a fixed-income security owned by the Fund
defaults, the Fund may incur additional expenses to seek recovery. In addition,
periods of economic uncertainty and change can be expected to result in an
increased volatility of market prices of lower rated securities and a
concomitant volatility in the net asset value of a share of the Fund. Moreover,
the market prices of certain of the Fund's portfolio securities which are
structured as zero coupon and payment-in-kind securities are affected to a
greater extent by interest rate changes and thereby tend to be more volatile
than securities which pay interest periodically and in cash (see "Dividends,
Distributions and Taxes" for a discussion of the tax ramifications of
investments in such securities).
 
    The secondary market for lower rated securities may be less liquid than the
markets for higher quality securities and, as such, may have an adverse affect
on the market prices of certain securities. The limited liquidity of the market
may also adversely affect the ability of the Fund's Trustees to arrive at a fair
value for certain lower rated securities at certain times and should make it
difficult for the Fund to sell certain securities. In addition, new laws and
proposed new laws may have an adverse effect upon the value of lower rated
securities and a concomitant negative impact upon the net asset value of a share
of the Fund.
 
   
    During the fiscal year ended September 30, 1996, the monthly dollar weighted
average ratings of the debt obligations held by the Fund, expressed as a
percentage of the Fund's total investments, were as follows:
    
 
   
<TABLE>
<CAPTION>
                              PERCENTAGE OF
RATINGS                     TOTAL INVESTMENTS
- -------------------------  --------------------
<S>                        <C>
AAA/Aaa..................            0.0%
AA/Aa....................            1.4%
A/A......................           14.2%
BBB/Baa..................           10.2%
BB/Ba....................           19.5%
B/B......................           42.4%
CCC/Caa..................            1.2%
CC/Ca....................            0.0%
C/C......................            0.0%
Unrated..................           11.1%
</TABLE>
    
 
    OPTIONS AND FUTURES TRANSACTIONS.  The Fund is permitted to enter into call
and put options on U.S. Treasury notes, bonds and bills and equity securities
which are listed on Exchanges and are written in over-the-counter transactions
("OTC options"). Listed options are issued by the Options Clearing Corporation.
OTC options are purchased from or sold (written) to dealers or financial
institutions which have entered into direct agreements with the Fund. The Fund
is permitted to write covered call options on portfolio securities, in an amount
not
 
                                       10
<PAGE>
exceeding 20% of the value of its total assets, in order to aid it in achieving
its investment objective.
 
    The Fund may purchase listed and OTC call and put options in amounts
equalling up to 5% of its total assets. The Fund may purchase call options only
in order to close out a covered call position. 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. The Fund may
also purchase put options to close out written put positions. There are no other
limits on the Fund's ability to purchase call and put options.
 
    The Fund may purchase and sell financial futures contracts ("futures
contracts") that are traded on U.S. commodity exchanges on such underlying
securities as U.S. Treasury bonds, notes, and bills. The Fund may invest in
financial futures contracts only as a hedge against anticipated interest rate
changes.
 
    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. 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 and the sale of a futures
contract or to close out a long or short position in futures contracts.
 
    The Fund may not enter into futures contracts or purchase related options
thereon if, immediately thereafter, the amount committed to initial 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%. Moreover, the Fund may only buy and write options which are
listed on national securities exchanges and may not purchase options if, as a
result, the aggregate cost of all outstanding options exceeds 10% of the Fund's
total assets. In addition, the Fund may not purchase or sell futures contracts
or related options thereon if, immediately thereafter, more than one-third of
its net assets would be hedged.
 
    RISKS OF OPTIONS AND FUTURES TRANSACTIONS. The Fund may close out its
position as writer of an option, or as a buyer or seller of a futures contract
only if a liquid secondary market exists for options or futures contracts of
that series. There is no assurance that such a market will exist particularly in
the case of OTC options, as such options generally will 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 many futures contracts 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.
 
    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 or price
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 and indices
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.
 
                                       11
<PAGE>
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
rating agencies, research, analysis and appraisals of brokers and dealers,
including Dean Witter Reynolds Inc. ("DWR"), a broker-dealer affiliate of
InterCapital, the views of Trustees of the Fund 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 Growth
and Income Group, which manages twenty-two funds and fund portfolios with
approximately $22.6 billion in assets at October 31, 1996. Michael G. Knox,
Senior Portfolio Manager of InterCapital, and a member of InterCapital's Growth
and Income Group, has been the primary portfolio manager of the Fund since
November, 1994 and has been the sole portfolio manager of the Fund since
December, 1995. Mr. Knox has been managing portfolios comprised of growth and
other securities at InterCapital since August, 1993; prior thereto he was a
portfolio manager and analyst with Eagle Asset Management, Inc. (February,
1991-August, 1993) and an assistant portfolio manager and analyst with Heritage
Asset Management, Inc. (July, 1988-February, 1991).
    
 
    Orders for transactions in portfolio securities are placed for the Fund with
a number of brokers and dealers, including DWR. Pursuant to an order of the
Securities and Exchange Commission, the Fund may effect principal transactions
in certain money market instruments with DWR. In addition, the Fund may incur
brokerage commissions on transactions conducted through DWR.
 
    The portfolio trading engaged in by the Fund may result in its portfolio
turnover rate exceeding 100%. The Fund is expected to incur higher than normal
brokerage commission costs due to its portfolio turnover rate. Short-term gains
and losses taxable at ordinary income rates may result from such portfolio
transactions. See "Dividends, Distributions and Taxes" for a full discussion of
the tax implications of the Fund's trading policy. A more extensive discussion
of the Fund's portfolio brokerage policies is set forth in the Statement of
Additional Information.
 
    Except as specifically noted, all investment objectives, policies and
practices discussed above are not fundamental policies of the Fund and, as such,
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 Investment
Company Act of 1940, as amended (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. For purposes of compliance with this
restriction, the Fund will not invest in the convertible securities of any one
issuer if, upon conversion of such securities, the Fund would hold more than 10%
of the outstanding voting securities of that issuer.
 
   3. Invest more than 25% 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.
 
                                       12
<PAGE>
   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. Borrow money, except that the Fund may borrow from a bank for temporary or
emergency purposes in amounts not exceeding 5% (taken at the lower of cost or
current value) of the value of its total assets (not including the amount
borrowed).
 
   6. Invest more than 5% of the value of its total assets in warrants,
including not more than 2% of such assets in warrants not listed on either the
New York or American Stock Exchange. However, the acquisition of warrants
attached to other securities is not subject to this restriction.
 
    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.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
    The Fund offers 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 minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may be made by sending a check, payable to Dean Witter Convertible Securities
Trust, directly to Dean Witter Trust Company (the "Transfer Agent") at P.O. Box
1040, Jersey City, NJ 07303 or by contacting a DWR or other Selected
Broker-Dealer account executive. The minimum initial purchase in the case of
investments through EasyInvest, an automatic purchase plan (see "Shareholder
Services"), is $100, provided that the schedule of automatic investments will
result in investments totalling at least $1,000 within the first twelve months.
In the case of investments pursuant to Systematic Payroll Deduction Plans
(including Individual Retirement Plans), the Fund, in its discretion, may accept
investments without regard to any minimum amounts which would otherwise be
required if the Fund has reason to believe that additional investments will
increase the investment in all accounts under such Plans to at least $1,000.
Certificates for shares purchased will not be issued unless a request is made by
the shareholder in writing to the Transfer Agent. The offering price will be the
net asset value per share next determined following receipt of an order (see
"Determination of Net Asset Value").
 
   
    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. 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. As noted above, orders placed directly with the Transfer Agent must be
accompanied by payment. Investors will be entitled to receive income dividends
and capital gains distributions if their order is received by the close of
business on the day prior to the record date for such dividends and
distributions. While no sales charge is imposed at the time shares are
purchased, a contingent deferred sales charge may be imposed at the time of
redemption (see "Redemptions and Repurchases"). Sales personnel are compensated
for selling shares of the Fund at the time of
    
 
                                       13
<PAGE>
their sale by the Distributor and/or 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.
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act (the "Plan"), under which the Fund pays the Distributor a fee, which is
accrued daily and payable monthly, at an annual rate of 1% of the lesser of: (a)
the average daily aggregate gross sales of the Fund's 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
shares redeemed since the Fund's inception upon which a contingent deferred
sales charge has been imposed or waived, or (b) the Fund's average daily net
assets. This fee is treated by the Fund as an expense in the year it is accrued.
A portion of the fee payable pursuant to the Plan, equal to 0.25% of the Fund's
average daily net assets, is characterized as a service fee within the meaning
of NASD guidelines. The service fee is a payment made for personal service
and/or maintenance of shareholder accounts.
 
    Amounts paid under the Plan are 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, including the payment of commissions for
sales of the Fund's shares and incentive compensation to and expenses of DWR
account executives and others who engage in or support distributions 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 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.
 
   
    For the fiscal year ended September 30, 1996, the Fund accrued payments
under the Plan amounting to $2,057,104, which amount is equal to 1.0% of the
Fund's average daily net assets for the fiscal year. The payments accrued under
the Plan were calculated pursuant to clause (b) of the compensation formula
under the Plan.
    
 
   
    At any given time, the expenses of distributing shares of the Fund may be in
excess of the total of (i) the payments made by the Fund pursuant to the Plan,
and (ii) the proceeds of contingent deferred sales charges paid by investors
upon the redemption of shares (see "Redemptions and Repurchases--Contingent
Deferred Sales Charge"). For example, if $1 million in expenses in distributing
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 $71,800,910 at September 30, 1996, which was
equal to 30.64% of the Fund's net assets on such date. Of this amount,
$1,471,908 represents excess distribution expenses of TCW/DW Global Convertible
Trust, the net assets of which were combined with those of the Fund on December
22, 1995 pursuant to an Agreement and Plan of Reorganization. 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, this excess amount does not constitute a liability of the Fund. Although
there is no legal obligation for the Fund to pay expenses incurred in excess of
payments made to the Distributor under the Plan and the proceeds of contingent
deferred sales charges paid by investors upon redemption of shares, if for any
reason the Plan is terminated, the Trustees will consider at that time the
manner in which to treat such expenses. Any cumulative expenses incurred, but
not yet
    
 
                                       14
<PAGE>
recovered through distribution fees or contingent deferred sales charges, may or
may not be recovered through future distribution fees or contingent deferred
sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
    The net asset value per share of the Fund is determined once daily at 4:00
p.m., New York time, on each day that the New York Stock Exchange is open, or,
on days when the New York Stock Exchange closes prior to 4:00 p.m., at such
earlier time, by taking the value of all assets of the Fund, subtracting its
liabilities, dividing by the number of shares outstanding and adjusting to the
nearest cent. 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) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
domestic or foreign exchange is valued at its latest sale price on that exchange
prior to the time assets are valued; if there were no sales that day, the
security is valued at the latest bid price (in cases where a security is traded
on more than one exchange, the security is valued on the exchange designated as
the primary market pursuant to procedures adopted by the Trustees), and (2) all
other portfolio securities for which over-the-counter market quotations are
readily available are valued at the latest bid price. When market quotations are
not readily available, or when it is determined by the Investment Manager that
sale or bid prices are not reflective of a security's fair 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.
    
 
    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.
 
   
    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 Fund (or, if specified by the shareholder, any other open-end
investment company for which InterCapital serves as investment manager
(collectively, with the Fund, the "Dean Witter Funds")), unless the shareholder
requests that they be paid in cash. Shares so acquired are not subject to the
imposition of a contingent deferred sales charge upon their redemption (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, 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
 
                                       15
<PAGE>
any dollar amount, not less than $25, or in any whole percentage of the account
balance, on an annualized basis. Any applicable contingent deferred sales charge
will be imposed on shares redeemed under the Withdrawal Plan (see "Redemptions
and Repurchases--Contingent Deferred Sales Charge"). 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 contingent
deferred sales charge) to the shareholder will be the designated monthly or
quarterly amount.
 
    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.
 
    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 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 not subject to the imposition of a contingent
deferred sales charge upon their redemption (see "Redemptions and Repurchases.")
 
    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 DWR or other Selected Broker-
Dealer account executive or the Transfer Agent.
 
EXCHANGE PRIVILEGE
 
    The Fund makes available to its shareholders an "Exchange Privilege"
allowing the exchange of shares of the Fund for shares of other Dean Witter
Funds sold with a contingent deferred sales charge ("CDSC funds"), and for
shares of Dean Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term
Municipal Trust, Dean Witter Short-Term Bond Fund, Dean Witter Balanced Growth
Fund, Dean Witter Balanced Income Fund and Dean Witter Intermediate Term U.S.
Treasury Trust and five Dean Witter Funds which are money market funds (the
foregoing eleven non-CDSC funds are hereinafter referred to as the "Exchange
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 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 the net asset value
determined the following business day. Subsequent exchanges between any of the
money market funds and any of the CDSC funds can be effected on the same basis.
No contingent deferred sales charge ("CDSC") is imposed at the time of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different CDSC schedule than that of this Fund will be subject to the CDSC
schedule of this Fund, even if such shares are subsequently re-exchanged for
shares of the CDSC fund originally purchased. 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 (for
the purpose of determining the rate of the CDSC) is frozen. If those shares are
subsequently reexchanged for shares of a CDSC fund, the holding period
previously frozen when the
 
                                       16
<PAGE>
first exchange was made resumes on the last day of the month in which shares of
a CDSC fund are reacquired. Thus, the CDSC is based upon the time (calculated as
described above) the shareholder was invested in a CDSC fund (see "Redemptions
and Repurchases--Contingent Deferred Sales Charge."). 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, if any,
are described in the prospectuses for those funds.)
 
    In addition, shares of the Fund may be acquired in exchange for shares of
Dean Witter Funds sold with a front-end sales charge ("front-end sales charge
funds"), but shares of the Fund, however acquired, may not be exchanged for
shares of front-end sales charge funds. Shares of a CDSC fund acquired in
exchange for shares of a front-end sales charge fund (or in exchange for shares
of other Dean Witter Funds for which shares of a front-end sales charge fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    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
and any other conditions imposed by each fund. An exchange will be treated for
federal income tax purposes the same as a repurchase or redemption of shares, on
which the shareholder may realize a capital gain or loss. However, the ability
to deduct capital losses on an exchange may be limited in situations where there
is an exchange of shares within ninety days after the shares are purchased. The
Exchange Privilege is only available in states where an exchange may legally be
made.
 
    If DWR or other 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
 
                                       17
<PAGE>
writing or by contacting the Transfer Agent at (800) 869-NEWS (toll-free). The
Fund will employ reasonable procedures to confirm that exchange instructions
communicated over the telephone are genuine. Such procedures may include
requiring various forms of personal identification such as name, mailing
address, social security or other tax identification number and DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege Authorization Form and who is unable to
reach the Fund by telephone should contact his or her DWR or another 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 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 contingent deferred sales
charges (see below). If shares are held in a shareholder's account without a
share certificate, a written request for redemption sent 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.
 
    CONTINGENT DEFERRED SALES CHARGE.  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 charge upon redemption.
Shares redeemed sooner than six years after purchase may, however, be subject to
a charge upon redemption. This charge is called a "contingent deferred sales
charge" ("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 table below:
 
<TABLE>
<CAPTION>
                                            CONTINGENT DEFERRED
               YEAR SINCE                      SALES CHARGE
                PURCHASE                    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>
 
    A CDSC will not be imposed on: (i) any amount which represents an increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six 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 Dean Witter Funds sold with a front-end sales charge or of other
Dean Witter Funds acquired in exchange for such shares. Moreover, in determining
whether a CDSC is applicable it will be assumed that amounts described in (i),
(ii) and (iii) above (in
 
                                       18
<PAGE>
that order) are redeemed first. In addition, no CDSC will be imposed on
redemptions of shares which are attributable to reinvestment of dividends or
distributions from, or the proceeds of, certain Unit Investment Trusts.
 
    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
corporate or self-employed retirement plan qualified under Section 401(k) 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 Dean Witter Trust Company,
an affiliate of the Investment Manager, serves as recordkeeper or Trustee
("Eligible 401(k) Plan"), provided that either: (A) the plan continues to be an
Eligible 401(k) 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.
 
    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 or telegraphic 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,
the Distributor, DWR or other Selected Broker-Dealers. The offer by DWR and
other Selected Broker-Dealers to repurchase shares may be suspended without
notice by them at any time. In that event, shareholders may redeem their shares
through the Fund's Transfer Agent as set forth above under "Redemption."
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  Payment for shares presented
for repurchase or redemption will be made by check within seven days after
receipt by the Transfer Agent of the certificate and/or written request in good
order. Such payment may be postponed or the right of redemption suspended under
unusual circumstances, e.g., when normal trading is not taking place on the New
York Stock Exchange. If the shares to be redeemed have recently been
pur-
 
                                       19
<PAGE>
chased 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 executives 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 thirty 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 at the 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 Fund's Trustees or, in the case of an account opened through
EasyInvest, if after twelve months the Shareholder has invested less than $1,000
in the account. However, before the Fund redeems such shares and sends the
proceeds to the shareholder, it will notify the shareholder that the value of
the shares is less than the applicable amount and allow him or her sixty days to
make an additional investment in an amount which will increase the value of his
or her account to at least the applicable amount or more before the redemption
is processed. No CDSC will be imposed on any involuntary redemption.
    
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Fund intends to pay quarterly income
dividends and to distribute net short-term and net long-term gains, if any, at
least once per year. The Fund may, however, determine either to distribute or to
retain all or part of any long-term gains in any year for reinvestment.
 
    All dividends and capital gains distributions will be paid in additional
Fund shares and automatically credited to the shareholder's account without
issuance of a share certificate unless the shareholder requests in writing that
all dividends and/or distributions be paid in cash. (See "Shareholder Services--
Automatic Investment of Dividends and Distributions".)
 
    TAXES.  Because the Fund intends to distribute substantially all of its net
investment income and net capital gains to shareholders and otherwise remain
qualified as a regulated investment company under Subchapter M of the Internal
Revenue Code, it is not expected that the Fund will be required to pay any
federal income tax on such income and capital gains. Shareholders who are
required to pay taxes on their income will normally have to pay federal income
taxes, and any state income taxes, on the dividends and distributions they
receive from the Fund. Such dividends and distributions, to the extent they are
derived from net investment income or net short-term capital gains, are taxable
to the shareholder as ordinary dividend income regardless of whether the
shareholder receives such payments in additional shares or in cash.
 
    Gains or losses on the Fund's transactions in listed non-equity options,
futures and options on futures generally are 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
 
                                       20
<PAGE>
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 gains being available
for annual distribution.
 
    With respect to the Fund's investments in zero coupon and payment-in-kind
bonds, the Fund accrues income prior to any actual cash payments by their
issuers. In order to continue to comply with Subchapter M of the Code and remain
able to forego payment of Federal income tax on its income and capital gains,
the Fund must distribute all of its net investment income, including income
accrued from zero coupon and payment-in-kind bonds. As such, the Fund may be
required to dispose of some of its portfolio securities under disadvantageous
circumstances to generate the cash required for distribution.
 
    One of the requirements for the Fund to remain qualified as a regulated
investment company is that less than 30% of the Fund's 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.
 
    After the end of the calendar year, shareholders will receive full
information on their dividends and capital gains distributions for tax purposes.
To avoid being subject to a 31% federal backup withholding tax on taxable
dividends, capital gains distributions and the proceeds of redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to their accuracy.
 
    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.
 
    Shareholders should consult their tax advisers as to the applicability of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
    From time to time the Fund may quote its "yield" and/or its "total return"
in advertisements and sales literature. 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 the Fund is computed by dividing the Fund's net
investment income over a 30-day period by an average value (using the average
number of shares entitled to receive dividends and the net asset value per share
at the end of the period), all in accordance with applicable regulatory
requirements. Such amount is compounded for six months and then annualized for a
twelve-month period to derive the Fund's yield.
 
   
    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 the Fund of $1,000 over periods of one, five and ten
years, as well as over the life of the Fund. 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 Fund 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 over
different periods of time by means of aggregate, average, year-by-year or other
types of total return figures. Such calculations may or may not reflect the
deduction of the contingent deferred sales charge which, if reflected,
 
                                       21
<PAGE>
would reduce the performance quoted. The Fund may also advertise the growth of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
The Fund from time to time may also advertise its performance relative to
certain performance rankings and indices compiled by independent organizations
 
(such as mutual fund performance rankings of Lipper Analytical Services, Inc.).
 
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.
 
    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's
being unable to meet its obligations is remote and, thus, 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 person's employment
activities and that actual and potential conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an advance clearance process to monitor that no
investment company managed or advised by InterCapital ("Dean Witter Fund") is
engaged at the same time in a purchase or sale of the same security. The Code of
Ethics bans the purchase of securities in an initial public offering, and also
prohibits engaging in futures and options transactions and profiting on
short-term trading (that is, a purchase within sixty days of a sale or a sale
within sixty days of a purchase) of a security. In addition, investment
personnel may not purchase or sell a security for their personal account within
thirty days before or after any transaction in any Dean Witter Fund managed by
them. Any violations of the Code of Ethics are subject to sanctions, including
reprimand, demotion or suspension or termination of employment. The Code of
Ethics comports with regulatory requirements and the recommendations in the 1994
report by the Investment Company Institute Advisory Group on Personal Investing.
    
 
    SHAREHOLDER INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the telephone numbers or address set forth on the front cover of
this Prospectus.
 
                                       22
<PAGE>
APPENDIX
- --------------------------------------------------------------------------------
 
RATINGS OF INVESTMENTS
MOODY'S INVESTORS SERVICE INC. ("MOODY'S")
 
                                  BOND RATINGS
 
<TABLE>
<S>        <C>
Aaa        Bonds which are rated Aaa are judged to be of the best quality. They carry the smallest
           degree of investment risk and are generally referred to as "gilt edge." Interest payments
           are protected by a large or by an exceptionally stable margin and principal is secure.
           While the various protective elements are likely to change, such changes as can be
           visualized are most unlikely to impair the fundamentally strong position of such issues.
Aa         Bonds which are rated Aa are judged to be of high quality by all standards. Together with
           the Aaa group they comprise what are generally known as high grade bonds. They are rated
           lower than the best bonds because margins of protection may not be as large as in Aaa
           securities or fluctuation of protective elements may be of greater amplitude or there may
           be other elements present which make the long-term risks appear somewhat larger than in
           Aaa securities.
A          Bonds which are rated A possess many favorable investment attributes and are to be
           considered as upper medium grade obligations. Factors giving security to principal and
           interest are considered adequate, but elements may be present which suggest a
           susceptibility to impairment sometime in the future.
Baa        Bonds which are rated Baa are considered as medium grade obligations; i.e., 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.
           Bonds rated Aaa, Aa, A and Baa are considered investment grade bonds.
Ba         Bonds which are rated Ba are judged to have speculative elements; their future cannot be
           considered as well assured. Often the protection of interest and principal payments may be
           very moderate, and therefore not well safeguarded during both good and bad times over the
           future. Uncertainty of position characterizes bonds in this class.
B          Bonds which are rated B generally lack characteristics of desirable investments. Assurance
           of interest and principal payments or of maintenance of other terms of the contract over
           any long period of time may be small.
Caa        Bonds which are rated Caa are of poor standing. Such issues may be in default or there may
           be present elements of danger with respect to principal or interest.
Ca         Bonds which are rated Ca present obligations which are speculative in a high degree. Such
           issues are often in default or have other marked shortcomings.
C          Bonds which are rated C are the lowest rated class of bonds, and issues so rated can be
           regarded as having extremely poor prospects of ever attaining any real investment
           standing.
</TABLE>
 
    CONDITIONAL RATING:  Municipal bonds for which the security 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 unseasoned in operation experience, (c)
rentals which begin
 
                                       23
<PAGE>
when facilities are completed, or (d) payments to which some other limiting
condition attaches. Parenthetical rating denotes probable credit stature upon
completion of construction or elimination of basis of condition.
 
    RATING REFINEMENTS:  Moody's may apply numerical modifiers, 1, 2 and 3 in
each generic rating classification from Aa through B in its corporate and
municipal bond rating system. The modifier 1 indicates that the security ranks
in the higher end of its generic rating category; the modifier 2 indicates a
mid-range ranking; and a modifier 3 indicates that the issue ranks in the lower
end of its generic rating category.
 
                            COMMERCIAL PAPER RATINGS
 
    Moody's Commercial Paper ratings are opinions of the ability 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, Prime-2, Prime-3.
 
    Issuers rated Prime-1 have a superior capacity for repayment of short-term
promissory obligations. Issuers rated Prime-2 have a strong capacity for
repayment of short-term promissory obligations; and Issuers rated Prime-3 have
an acceptable capacity for repayment of short-term promissory obligations.
Issuers rated Not Prime do not fall within any of the Prime rating categories.
 
STANDARD & POOR'S CORPORATION ("STANDARD & POOR'S")
 
                                  BOND RATINGS
 
    A Standard & Poor's bond rating is a current assessment of the
creditworthiness of an obligor with respect to a specific obligation. This
assessment may take into consideration obligors such as guarantors, insurers, or
lessees.
 
    The ratings are based on current information furnished by the issuer or
obtained by Standard & Poor's from other sources it considers reliable. The
ratings are based, in varying degrees, on the following considerations: (1)
likelihood of default-capacity and willingness of the obligor as to the timely
payment of interest and repayment of principal in accordance with the terms of
the obligation; (2) nature of and provisions of the obligation; and (3)
protection afforded by, and relative position of, the obligation in the event of
bankruptcy, reorganization or other arrangement under the laws of bankruptcy and
other laws affecting creditors' rights.
 
    Standard & Poor's does not perform an audit in connection with any rating
and may, on occasion, rely on unaudited financial information. The ratings may
be changed, suspended or withdrawn as a result of changes in, or unavailability
of, such information, or for other reasons.
 
<TABLE>
<S>        <C>
AAA        Debt rated AAA has the highest rating assigned by Standard & Poor's. Capacity to pay
           interest and repay principal is extremely strong.
AA         Debt rated AA has a very strong capacity to pay interest and repay principal and differs
           from the highest-rated issues only in small degree.
A          Debt rated A has a 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 than debt in higher-rated categories.
BBB        Debt rated BBB is regarded as having an adequate capacity to pay interest and repay
           principal. Whereas it normally exhibits adequate protection parameters, adverse economic
           conditions or changing circumstances are more likely to lead to a weakened capacity to
           pay interest and repay principal for debt in this category than for debt in higher-rated
           categories.
           Bonds rated AAA, AA, A and BBB are considered investment grade bonds.
</TABLE>
 
                                       24
<PAGE>
<TABLE>
<S>        <C>
BB         Debt rated BB has less near-term vulnerability to default than other speculative grade
           debt. However, it faces major ongoing uncertainties or exposure to adverse business,
           financial or economic conditions which could lead to inadequate capacity to meet timely
           interest and principal payment.
B          Debt rated B has a greater vulnerability to default but presently has the capacity to
           meet interest payments and principal repayments. Adverse business, financial or economic
           conditions would likely impair capacity or willingness to pay interest and repay
           principal.
CCC        Debt rated CCC has a current identifiable vulnerability to default, and is dependent upon
           favorable business, financial and economic conditions to meet timely payments of interest
           and repayments of principal. In the event of adverse business, financial or economic
           conditions, it is not likely to have the capacity to pay interest and repay principal.
CC         The rating CC is typically applied to debt subordinated to senior debt which is assigned
           an actual or implied CCC rating.
C          The rating C is typically applied to debt subordinated to senior debt which is assigned
           an actual or implied CCC- debt rating.
CI         The rating CI is reserved for income bonds on which no interest is being paid.
NR         Indicates that no rating has been requested, that there is insufficient information on
           which to base a rating or that Standard & Poor's does not rate a particular type of
           obligation as a matter of policy.
           Bonds rated BB, B, CCC, CC and C are regarded as having predominantly speculative
           characteristics with respect to capacity to pay interest and repay principal. BB
           indicates the least degree of speculation and C the highest degree of speculation. While
           such debt will likely have some quality and protective characteristics, these are
           outweighed by large uncertainties or major risk exposures to adverse conditions.
           Plus (+) or minus (-): The ratings from AA to CCC may be modified by the addition of a
           plus or minus sign to show relative standing within the major ratings categories.
           In the case of municipal bonds, 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.
</TABLE>
 
                                       25
<PAGE>
                            COMMERCIAL PAPER RATINGS
 
    Standard and 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 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 group categories,
ranging from "A" for the highest quality obligations to "D" for the lowest.
Ratings are applicable to both taxable and tax-exempt commercial paper. The
categories are as follows:
 
    Issues assigned A ratings are regarded as having the greatest capacity for
timely payment. Issues in this category are further refined with the designation
1, 2 and 3 to indicate the relative degree of safety.
 
<TABLE>
<S>        <C>
A-1        indicates that the degree of safety regarding timely payment is very strong.
A-2        indicates capacity for timely payment on issues with this designation is strong. However,
           the relative degree of safety is not as overwhelming as for issues designated "A-1".
A-3        indicates a satisfactory capacity for timely payment. Obligations carrying this
           designation are, however, somewhat more vulnerable to the adverse effects of changes in
           circumstances than obligations carrying the higher designations.
</TABLE>
 
                                       26
<PAGE>
                        THE DEAN WITTER FAMILY OF FUNDS
 
   
MONEY MARKET FUNDS                       DEAN WITTER RETIREMENT SERIES
Dean Witter Liquid Asset Fund Inc.       Liquid Asset Series
Dean Witter Tax-Free Daily Income Trust  U.S. Government Money Market Series
Dean Witter U.S. Government Money        U.S. Government Securities Series
Market Trust                             Intermediate Income Securities Series
Dean Witter New York Municipal Money     American Value Series
Market Trust                             Capital Growth Series
Dean Witter California Tax-Free Daily    Dividend Growth Series
Income Trust                             Strategist Series
                                         Utilities Series
EQUITY FUNDS                             Value-Added Market Series
Dean Witter American Value Fund          Global Equity Series
Dean Witter Natural Resource
Development Securities Inc.              ASSET ALLOCATION FUNDS
Dean Witter Dividend Growth Securities   Dean Witter Strategist Fund
Inc.                                     Dean Witter Global Asset Allocation
Dean Witter Developing Growth            Fund
Securities Trust
Dean Witter World Wide Investment Trust  ACTIVE ASSETS ACCOUNT PROGRAM
Dean Witter Value-Added Market Series    Active Assets Money Trust
Dean Witter Utilities Fund               Active Assets Tax-Free Trust
Dean Witter Capital Growth Securities    Active Assets California Tax-Free Trust
Dean Witter European Growth Fund Inc.    Active Assets Government Securities
Dean Witter Pacific Growth Fund Inc.     Trust
Dean Witter Precious Metals and
Minerals Trust
Dean Witter Health Sciences Trust
Dean Witter Global Dividend Growth
Securities
Dean Witter Global Utilities Fund
Dean Witter International SmallCap Fund
Dean Witter Mid-Cap Growth Fund
Dean Witter Balanced Growth Fund
Dean Witter Capital Appreciation Fund
Dean Witter Information Fund
Dean Witter Japan Fund
Dean Witter Income Builder Fund
Dean Witter Special Value Fund
FIXED-INCOME FUNDS
Dean Witter High Yield Securities Inc.
Dean Witter Tax-Exempt Securities Trust
Dean Witter U.S. Government Securities
Trust
Dean Witter Intermediate Term U.S.
Treasury Trust
Dean Witter Federal Securities Trust
Dean Witter California Tax-Free Income
Fund
Dean Witter Convertible Securities
Trust
Dean Witter New York Tax-Free Income
Fund
Dean Witter World Wide Income Trust
Dean Witter Intermediate Income
Securities
Dean Witter Global Short-Term Income
Fund Inc.
Dean Witter Multi-State Municipal
Series Trust
Dean Witter Premier Income Trust
Dean Witter Short-Term U.S. Treasury
Trust
Dean Witter Diversified Income Trust
Dean Witter Limited Term Municipal
Trust
Dean Witter Short-Term Bond Fund
Dean Witter National Municipal Trust
Dean Witter High Income Securities
Dean Witter Balanced Income Fund
Dean Witter Hawaii Municipal Trust
    
<PAGE>
 
Dean Witter                         DEAN WITTER
Convertible Securities Trust        CONVERTIBLE
Two World Trade Center              SECURITIES
New York, New York 10048            TRUST
 
   
TRUSTEES
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
 
Sheldon Curtis
Vice President, Secretary and
General Counsel
 
Michael G. Knox                                   [LOGO]
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 -- NOVEMBER 25, 1996
 
    
<PAGE>
   
STATEMENT OF ADDITIONAL INFORMATION
NOVEMBER 25, 1996
    
 
- --------------------------------------------------------------------------------
 
DEAN WITTER
CONVERTIBLE
SECURITIES TRUST
 
    Dean  Witter  Convertible  Securities  Trust  (the  "Fund")  is  an open-end
diversified management investment company whose investment objective is to  seek
a  high level  of total return  on its  assets through a  combination of current
income and capital appreciation. It seeks to achieve its investment objective by
investing principally  in  "convertible  securities,"  that  is,  bonds,  notes,
debentures,  preferred stocks  and other  securities which  are convertible into
common stocks. (See "Investment Practices and Policies".)
 
   
    A Prospectus for the Fund dated November 25, 1996, which provides the  basic
information  you  should know  before  investing in  the  Fund, may  be obtained
without charge from the Fund at the 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
additional  information regarding the activities and operations of the Fund, and
should be read in conjunction with the Prospectus.
    
 
Dean Witter
Convertible 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......................................................         11
 
Investment Restrictions................................................................         23
 
Portfolio Transactions and Brokerage...................................................         24
 
The Distributor........................................................................         25
 
Shareholder Services...................................................................         29
 
Redemptions and Repurchases............................................................         33
 
Dividends, Distributions and Taxes.....................................................         36
 
Performance Information................................................................         37
 
Description of Shares of the Fund......................................................         38
 
Custodian and Transfer Agent...........................................................         38
 
Independent Accountants................................................................         39
 
Reports to Shareholders................................................................         39
 
Legal Counsel..........................................................................         39
 
Experts................................................................................         39
 
Registration Statement.................................................................         39
 
Report of Independent Accountants......................................................         40
 
Financial Statements -- September 30, 1996.............................................         41
</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
May 21, 1985.
 
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 Dean Witter, Discover &  Co. ("DWDC"), a Delaware corporation.  In
an  internal  reorganization which  took  place in  January,  1993, InterCapital
assumed  the  investment  advisory,  administrative  and  management  activities
previously  performed by the InterCapital Division  of Dean Witter Reynolds Inc.
("DWR"), a broker-dealer affiliate of InterCapital. (As hereinafter used in this
Statement of Additional  Information, the terms  "InterCapital" and  "Investment
Manager"   refer  to   DWR's  InterCapital   Division  prior   to  the  internal
reorganization and  to  Dean Witter  InterCapital  Inc. thereafter.)  The  daily
management  of  the  Fund and  research  relating  to the  Fund's  portfolio are
conducted by  or  under  the direction  of  officers  of the  Fund  and  of  the
Investment  Manager,  subject to  review  by the  Fund's  Board of  Trustees. In
addition, Trustees of the Fund provide guidance on economic factors and interest
rate trends. 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 management  investment companies:  Active Assets  Money Trust,  Active
Assets  Tax-Free Trust, Active  Assets California Tax-Free  Trust, Active Assets
Government Securities Trust, InterCapital  Income Securities Inc.,  InterCapital
Insured Municipal Bond Trust, InterCapital Insured Municipal Trust, InterCapital
Insured  Municipal  Income  Trust,  InterCapital  Insured  Municipal Securities,
InterCapital California  Insured Municipal  Income Trust,  InterCapital  Insured
California  Municipal  Securities,  InterCapital  Quality  Municipal  Investment
Trust,  InterCapital  Quality  Municipal  Income  Trust,  InterCapital   Quality
Municipal  Securities,  InterCapital  California  Quality  Municipal Securities,
InterCapital New York Quality Municipal Securities, High Income Advantage Trust,
High Income Advantage  Trust II, High  Income Advantage Trust  III, Dean  Witter
Government  Income Trust,  Dean Witter High  Yield Securities  Inc., Dean Witter
Tax-Free Daily  Income  Trust, Dean  Witter  Tax-Exempt Securities  Trust,  Dean
Witter Dividend Growth Securities Inc., Dean Witter Natural Resource Development
Securities  Inc., Dean Witter American Value Fund, Dean Witter Developing Growth
Securities Trust, 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 World  Wide Income  Trust, Dean  Witter California  Tax-Free
Income  Fund, Dean Witter New York Tax-Free Income Fund, Dean Witter Convertible
Securities Trust, Dean Witter Federal Securities Trust, Dean Witter  Value-Added
Market Series, Dean Witter Utilities Fund, Dean Witter California Tax-Free Daily
Income  Trust,  Dean Witter  Strategist  Fund, Dean  Witter  Intermediate Income
Securites, Dean Witter  Capital Growth Securities,  Dean Witter Precious  Metals
and  Minerals Trust,  Dean Witter  New York  Municipal Money  Market Trust, Dean
Witter European  Growth Fund  Inc., 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, Dean Witter  Premier
Income  Trust, Dean Witter Diversified Income Trust, Dean Witter Health Sciences
Trust, Dean  Witter  Retirement  Series,  Dean  Witter  Global  Dividend  Growth
Securities,  Dean Witter  Limited Term  Municipal Trust,  Dean Witter Short-Term
Bond  Fund,  Dean  Witter  Global  Utilities  Fund,  Dean  Witter  High   Income
Securities,  Dean Witter Information Fund, Dean Witter National Municipal Trust,
Dean Witter International SmallCap Fund,  Dean Witter Mid-Cap Growth Fund,  Dean
Witter  Select Dimensions Investment  Series, Dean Witter  Balanced Income Fund,
Dean Witter  Balanced Growth  Fund,  Dean Witter  Hawaii Municipal  Trust,  Dean
Witter  Japan Fund, Dean  Witter Income Builder Fund,  Dean Witter Special Value
Fund, Dean Witter Capital Appreciation Fund, Dean Witter Intermediate Term  U.S.
Treasury  Trust, Municipal  Income Trust,  Municipal Income  Trust II, Municipal
Income Trust III,
    
 
                                       3
<PAGE>
Municipal Income Opportunities Trust,  Municipal Income Opportunities Trust  II,
Municipal  Income Opportunities  Trust III,  Municipal Premium  Income Trust and
Prime Income Trust. The foregoing investment companies, together with the  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  investment
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)  sub-adviser  to  Templeton  Global  Opportunities  Trust,  an open-end
investment company; (ii)  administrator of  The BlackRock  Strategic Term  Trust
Inc., a closed-end investment company; and (iii) sub-administrator of MassMutual
Participation   Investors  and   Templeton  Global   Governments  Income  Trust,
closed-end investment companies.
    
 
    Pursuant to an  Investment Management Agreement  (the "Agreement") with  the
Investment  Manager, the Fund has retained  the Investment Manager to manage the
investment of  the  Fund's assets,  including  the  placing of  orders  for  the
purchase  and sale of  portfolio securities. The  Investment Manager obtains and
evaluates such  information  and  advice relating  to  the  economy,  securities
markets,  and  specific  securities  as  it  considers  necessary  or  useful to
continuously manage  the assets  of the  Fund in  a manner  consistent with  its
investment objective and policies.
 
    Under  the  terms  of the  Agreement,  in  addition to  managing  the Fund's
investments, the Investment Manager  maintains certain of  the Fund's books  and
records  and  furnishes,  at its  own  expense, such  office  space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including the preparation  of
prospectuses, 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  such  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 (see "The Distributor") will be  paid
by  the Fund. The  expenses borne by the  Fund include, but  are not limited to:
expenses  of  the  Plan  of  Distribution  pursuant  to  Rule  12b-1  (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  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
 
                                       4
<PAGE>
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.
 
   
    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: 0.60% of the portion of
the daily net assets  of the Fund  not exceeding $750 million  and 0.55% of  the
portion  of the  daily net  assets exceeding $750  million but  not exceeding $1
billion; 0.50% of the portion of the  daily net assets of the Fund exceeding  $1
billion  but not  exceeding $1.5  billion; 0.475% of  the portion  of the Fund's
daily net assets exceeding $1.5 billion  but not exceeding $2 billion; 0.45%  of
the  portion  of  the Fund's  daily  net  assets exceeding  $2  billion  but not
exceeding $3 billion; and 0.425% of the  portion of the Fund's daily net  assets
exceeding  $3 billion. Total compensation accrued  to the Investment Manager for
the fiscal years ended September 30, 1994, 1995 and 1996 amounted to $1,201,442,
$1,074,494 and $1,234,262, 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 October 30,
1992 and by the shareholders  of the Fund at  a Special Meeting of  Shareholders
held  on January 12, 1993.  The Agreement is substantially  identical to a prior
investment management agreement which was initially approved by the Trustees  on
July  19, 1985 and by DWR as the then  sole shareholder on August 8, 1985 and by
the Shareholders of the  Fund at a Special  Meeting of Shareholders on  December
29, 1986. The Agreement took effect on June 30, 1993 upon the spin-off by Sears,
Roebuck  & Co. of its  remaining shares of DWDC.  Under its terms, the Agreement
had an initial term ending April 30, 1994 and provides that it will continue  in
effect  from year to  year thereafter, provided continuance  of the Agreement is
approved at least annually by the vote of the holders of a majority, as  defined
in  the Act, of  the outstanding shares of  the 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. At their meeting held on April  17,
1996,  the Fund's Board of Trustees,  including all of the Independent Trustees,
approved the most recent continuation of the Agreement until April 30, 1997.
    
 
    The Agreement may  be terminated  at any  time, without  penalty, on  thirty
days'  notice by  the 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).
 
   
    The Fund has acknowledged that the name "Dean Witter" is a property right of
DWR. The Fund has agreed that DWR or its parent company may use or, at any time,
permit others to use, the name "Dean  Witter." The Fund has also agreed that  in
the   event  the  Agreement  is  terminated,   or  if  the  affiliation  between
InterCapital and its parent company is  terminated, the Fund will eliminate  the
name "Dean Witter" from its name if DWR or its parent company shall so request.
    
 
                                       5
<PAGE>
TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------
 
   
    The  Trustees and Executive  Officers of the  Fund, their principal business
occupations during the  last five  years and  their affiliations,  if any,  with
InterCapital and with the 83 Dean Witter Funds and the 14 TCW/DW Funds are shown
below.
    
 
   
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------------------  ----------------------------------------------------------
<S>                                                     <C>
Michael Bozic (55)                                      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* (63)                            Chairman,  Chief   Executive  Officer   and  Director   of
Chairman of the Board, President, Chief                 InterCapital,  Dean  Witter Distributors  Inc. ("Distribu-
Executive Officer and Trustee                           tors") and DWSC; Executive Vice President and Director  of
Two World Trade Center                                  DWR;  Chairman, Director  or Trustee,  President and Chief
New York, New York                                      Executive Officer  of  the Dean  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  DWDC
                                                        subsidiaries;  formerly  Executive   Vice  President   and
                                                        Director of DWDC (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 Chemical Corporation                       Senate  Banking Committee  (1980-1986); formerly  Mayor of
500 Huntsman Way                                        Salt Lake  City,  Utah  (1972-1974);  formerly  Astronaut,
Salt Lake City, Utah                                    Space   Shuttle  Discovery   (April  12-19,   1985);  Vice
                                                        Chairman, Huntsman  Chemical Corporation  (since  January,
                                                        1993);
                                                        Director  of Franklin Quest  (time management systems) and
                                                        John Alden Financial Corp.; member of the board of various
                                                        civic and charitable organizations.
John R. Haire (71)                                      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>
Dr. Manuel H. Johnson (47)                              Senior  Partner,  Johnson  Smick  International,  Inc.,  a
Trustee                                                 consulting  firm  (since  June  1993);  Koch  Professor of
c/o Johnson Smick International, Inc.                   International Economics  and Director  of the  Center  for
1133 Connecticut Avenue, N.W.                           Global  Market Studies  at George  Mason University (since
Washington, D.C.                                        September 1990); Co-Chairman and a founder of the Group of
                                                        Seven Council (G7C), an international economic  commission
                                                        (since  September 1990);  Director or Trustee  of the Dean
                                                        Witter Funds;  Trustee of  the TCW/DW  Funds; Director  of
                                                        NASDAQ  (since June, 1995);  Director of Greenwich Capital
                                                        Markets Inc.  (broker-dealer); formerly  Vice Chairman  of
                                                        the  Board  of  Governors of  the  Federal  Reserve System
                                                        (1986-1990) and Assistant Secretary  of the U.S.  Treasury
                                                        (1982-1986).
Michael E. Nugent (60)                                  General  Partner,  Triumph  Capital, L.P.,  a  private 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* (53)                                 Chairman of  the Board  of Directors  and Chief  Executive
Trustee                                                 Officer  of  DWDC,  DWR and  Novus  Credit  Services Inc.;
Two World Trade Center                                  Director of InterCapital, DWSC and Distributors;  Director
New York, New York                                      or  Trustee  of  the Dean  Witter  Funds;  Director and/or
                                                        officer of various DWDC subsidiaries.
 
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                              Utilities Company; formerly  Executive Vice President  and
  Weitzen Shalov & Wein                                 Chief  Investment  Officer of  the Home  Insurance Company
Counsel to the Independent Trustees                     (August, 1991-September,  1995)  and  Chairman  and  Chief
114 West 47th Street                                    Investment  Officer  of  Axe-Houghton  Management  and the
New York, New York                                      Axe-Houghton Funds (1983-1991).
 
Sheldon Curtis (64)                                     Senior Vice President,  Secretary and  General Counsel  of
Vice President,                                         InterCapital  and DWSC;  Senior Vice  President, Assistant
Secretary and General Counsel                           Secretary and Assistant  General Counsel of  Distributors;
Two World Trade Center                                  Senior  Vice  President and  Secretary of  DWTC; Assistant
New York, New York                                      Secretary of DWR;  Vice President,  Secretary and  General
                                                        Counsel of the Dean Witter Funds and the TCW/DW Funds.
 
Michael G. Knox (30)                                    Senior  Portfolio Manager  of InterCapital  (since August,
Vice President                                          1993); formerly a portfolio manager and analyst with Eagle
Two World Trade Center                                  Asset Management, Inc.  (February, 1991-August, 1993)  and
New York, New York                                      assistant  portfolio  manager  and  analyst  with Heritage
                                                        Asset Management, Inc. (July, 1988-February, 1991).
</TABLE>
    
 
                                       7
<PAGE>
   
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ------------------------------------------------------  ----------------------------------------------------------
<S>                                                     <C>
Thomas F. Caloia (50)                                   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
<FN>']
- ---------
 *Denotes Trustees who are "interested persons"  of the Fund, as defined in  the
  Act.
</TABLE>
    
 
   
    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, 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 Kevin Hurley, Paul D. Vance and Ira N. Ross, Senior Vice Presidents of
InterCapital,  are  Vice  Presidents of  the  Fund.  Barry Fink  and  Marilyn K.
Cranney, First Vice  Presidents and Assistant  General Counsels of  InterCapital
and  DWSC,  LouAnne D.  McInnis and  Ruth Rossi,  Vice Presidents  and Assistant
General  Counsels  of  InterCapital  and  DWSC,  and  Carsten  Otto  and   Frank
Bruttomesso, Staff Attorneys with InterCapital, are Assistant Secretaries of the
Fund.
    
 
   
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
    
 
   
    The Board of Trustees consists of eight (8) trustees. These same individuals
also  serve as directors or  trustees for all of the  Dean Witter Funds, and are
referred to in this  section as Trustees.  As of the date  of this Statement  of
Additional  Information, there are a total of 83 Dean Witter Funds, comprised of
122 portfolios. As  of October 31,  1996, the  Dean Witter Funds  had total  net
assets of approximately $79.5 billion and more than five million shareholders.
    
 
   
    Six  Trustees  (75% of  the total  number) have  no affiliation  or business
connection with InterCapital or any of its affiliated persons and do not own any
stock or other securities issued  by InterCapital's parent company, DWDC.  These
are  the "disinterested" or "independent" Trustees.  The other two Trustees (the
"management Trustees")  are  affiliated  with  InterCapital.  Four  of  the  six
independent Trustees are also Independent Trustees of the TCW/DW Funds.
    
 
   
    Law and regulation establish both general guidelines and specific duties for
the  Independent Trustees.  The Dean Witter  Funds seek  as Independent Trustees
individuals of distinction  and experience in  business and finance,  government
service  or academia; these are people whose advice and counsel are in demand by
others and for  whom there is  often competition.  To accept a  position on  the
Funds'  Boards, such individuals may reject other attractive assignments because
the Funds make  substantial demands  on their time.  Indeed, by  serving on  the
Funds'  Boards, certain Trustees who would  otherwise be qualified and in demand
to serve on bank boards would be prohibited by law from doing so.
    
 
   
    All of the Independent Trustees serve as members of the Audit Committee  and
the  Committee of the Independent Trustees. Three  of them also serve as members
of the Derivatives Committee. During the calendar year ended December 31,  1995,
the  three Committees held a combined  total of fifteen meetings. The Committees
hold some  meetings at  InterCapital's offices  and some  outside  InterCapital.
Management  Trustees or  officers do not  attend these meetings  unless they are
invited for purposes of furnishing information or making a report.
    
 
   
    The Committee of the  Independent Trustees is  charged with recommending  to
the  full Board approval  of management, advisory  and administration contracts,
Rule 12b-1  plans  and  distribution and  underwriting  agreements;  continually
reviewing  Fund performance;  checking on  the pricing  of portfolio securities,
brokerage commissions, transfer agent costs  and performance, and trading  among
Funds  in the  same complex; and  approving fidelity bond  and related insurance
coverage and allocations, as well as other matters that arise from time to time.
The Independent Trustees are required to select and nominate individuals to fill
any Independent Trustee vacancy on the Board  of any Fund that has a Rule  12b-1
plan of distribution. Most of the Dean Witter Funds have such a plan.
    
 
                                       8
<PAGE>
   
    The  Audit  Committee is  charged with  recommending to  the full  Board the
engagement  or  discharge  of  the  Fund's  independent  accountants;  directing
investigations  into matters  within the  scope of  the independent accountants'
duties, including the power  to retain outside  specialists; reviewing with  the
independent  accountants the audit plan and  results of the auditing engagement;
approving professional  services provided  by  the independent  accountants  and
other  accounting firms prior to the performance of such services; reviewing the
independence of the independent accountants; considering the range of audit  and
non-audit  fees;  reviewing  the  adequacy  of  the  Fund's  system  of internal
controls; and preparing  and submitting  Committee meeting minutes  to the  full
Board.
    
 
   
    Finally,  the  Board of  each  Fund has  formed  a Derivatives  Committee to
establish parameters for and oversee the activities of the Fund with respect  to
derivative investments, if any, made by the Fund.
    
 
   
DUTIES OF CHAIRMAN OF COMMITTEE OF THE INDEPENDENT TRUSTEES AND AUDIT COMMITTEE
    
 
   
    The  Chairman of  the Committee  of the  Independent Trustees  and the Audit
Committee maintains an  office at  the Funds' headquarters  in New  York. He  is
responsible  for keeping abreast of regulatory and industry developments and the
Funds' operations and management. He  screens and/or prepares written  materials
and  identifies  critical  issues  for  the  Independent  Trustees  to consider,
develops agendas  for Committee  meetings,  determines the  type and  amount  of
information  that the Committees will need to form a judgment on various issues,
and arranges to have  that information furnished to  Committee members. He  also
arranges  for  the services  of independent  experts and  consults with  them in
advance of meetings  to help  refine reports and  to focus  on critical  issues.
Members of the Committees believe that the person who serves as Chairman of both
Committees  and guides their efforts is  pivotal to the effective functioning of
the Committees.
    
 
   
    The Chairman of the  Committees also maintains  continuous contact with  the
Funds' management, with independent counsel to the Independent Trustees and with
the  Funds' independent auditors.  He arranges for a  series of special meetings
involving the  annual  review  of  investment  advisory,  management  and  other
operating  contracts of  the Funds  and, on  behalf of  the Committees, conducts
negotiations with the Investment Manager and other service providers. In effect,
the Chairman of the  Committees serves as a  combination of chief executive  and
support staff of the Independent Trustees.
    
 
   
    The  Chairman of  the Committee  of the  Independent Trustees  and the Audit
Committee is  not  employed by  any  other  organization and  devotes  his  time
primarily  to the  services he  performs as  Committee Chairman  and Independent
Trustee of the Dean Witter Funds and  as an Independent Trustee and, since  July
1,  1996, as Chairman of the Committee of the Independent Trustees and the Audit
Committee of the TCW/DW Funds. The current Committee Chairman has had more  than
35 years experience as a senior executive in the investment company industry.
    
 
   
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL DEAN
WITTER FUNDS
    
 
   
    The  Independent Trustees and the Funds'  management believe that having the
same Independent  Trustees  for  each  of  the  Dean  Witter  Funds  avoids  the
duplication  of  effort  that  would  arise  from  having  different  groups  of
individuals serving as  Independent Trustees for  each of the  Funds or even  of
sub-groups  of Funds.  They believe  that having  the same  individuals serve as
Independent Trustees of  all the  Funds tends  to increase  their knowledge  and
expertise regarding matters which affect the Fund complex generally and enhances
their  ability  to negotiate  on behalf  of  each Fund  with the  Fund's service
providers. This arrangement also precludes the possibility of separate groups of
Independent Trustees arriving at conflicting decisions regarding operations  and
management  of the  Funds and  avoids the cost  and confusion  that would likely
ensue. Finally, having the  same Independent Trustees serve  on all Fund  Boards
enhances  the ability of  each Fund to  obtain, at modest  cost to each separate
Fund, the services of Independent Trustees, and a Chairman of their  Committees,
of  the caliber, experience and business acumen  of the individuals who serve as
Independent Trustees of the Dean Witter Funds.
    
 
                                       9
<PAGE>
   
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 September 30, 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.................................................       3,850
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, 1995 for services
to the 79 Dean Witter Funds and,  in the case of Messrs. Haire, Johnson,  Nugent
and  Schroeder, the 11 TCW/DW Funds that were in operation at December 31, 1995.
With respect to Messrs. Haire, Johnson,  Nugent and Schroeder, the TCW/DW  Funds
are  included solely because of a limited exchange privilege between those Funds
and five Dean Witter Money Market Funds. Mr. Schroeder was elected as a  Trustee
of the TCW/DW Funds on April 20, 1995.
    
 
   
              COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS
    
 
   
<TABLE>
<CAPTION>
                                                                                        TOTAL
                                                                   FOR SERVICE AS   COMPENSATION
                               FOR SERVICE                          CHAIRMAN OF         PAID
                              AS DIRECTOR OR                       COMMITTEES OF    FOR SERVICES
                               TRUSTEE AND       FOR SERVICE AS     INDEPENDENT          TO
                             COMMITTEE MEMBER     TRUSTEE AND        DIRECTORS/        79 DEAN
                                OF 79 DEAN      COMMITTEE MEMBER    TRUSTEES AND       WITTER
                                  WITTER          OF 11 TCW/DW         AUDIT        FUNDS AND 11
NAME OF INDEPENDENT TRUSTEE       FUNDS              FUNDS           COMMITTEES     TCW/DW FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------
<S>                          <C>                <C>                <C>              <C>
Michael Bozic..............      $126,050           --                 --             $126,050
Edwin J. Garn..............       136,450           --                 --              136,450
John R. Haire..............        98,450           $82,038           $217,350(1)      397,838
Dr. Manuel H. Johnson......       136,450            82,038            --              218,488
Michael E. Nugent..........       124,200            75,038            --              199,238
John L. Schroeder..........       136,450            46,964            --              183,414
</TABLE>
    
 
- ---------
   
(1)  For the 79  Dean Witter Funds in  operation at December  31, 1995. As noted
    above, on July 1, 1996,  Mr. Haire became Chairman  of the Committee of  the
    Independent Trustees and the Audit Committee of the TCW/DW Funds in addition
    to continuing to serve in such positions for the Dean Witter Funds.
    
 
   
    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
    
 
                                       10
<PAGE>
   
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.(2) "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 September 30,
1996 and by the  57 Dean Witter  Funds (including the Fund)  as of December  31,
1995,  and the estimated retirement benefits for the Fund's Independent Trustees
from the Fund as of September 30, 1996  and from the 57 Dean Witter Funds as  of
December 31, 1995.
    
 
   
          RETIREMENT BENEFITS FROM THE FUND AND ALL DEAN WITTER FUNDS
    
 
   
<TABLE>
<CAPTION>
                                           FOR ALL ADOPTING FUNDS                                       ESTIMATED ANNUAL
                                   --------------------------------------    RETIREMENT BENEFITS            BENEFITS
                                        ESTIMATED                            ACCRUED AS EXPENSES       UPON RETIREMENT(3)
                                     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%       $     399   $    26,359  $     950  $    51,550
Edwin J. Garn....................              10               50.0              589        41,901        950       51,550
John R. Haire....................              10               50.0              699       261,763      2,343      130,404
Dr. Manuel H. Johnson............              10               50.0              244        16,748        950       51,550
Michael E. Nugent................              10               50.0              422        30,370        950       51,550
John L. Schroeder................               8               41.7              776        51,812        792       42,958
</TABLE>
    
 
- ---------
   
(2)  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.
    
 
   
(3) Based on  current levels  of compensation.  Amount of  annual benefits  also
    varies depending on the Trustee's elections described in Footnote (2) above.
    
 
   
    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
- --------------------------------------------------------------------------------
 
    CONVERTIBLE  SECURITIES.   A  convertible  security entitles  the  holder to
exchange it  for a  fixed  number of  shares of  common  stock or  other  equity
security, usually of the same company, at fixed prices within a specified period
of  time. As  such, a  convertible security entitles  the holder  to receive the
fixed income of a bond or the dividend preference of a preferred stock until the
holder elects to exercise the conversion privilege.
 
    A convertible security's position in  a company's capital structure  depends
upon  its  particular  provisions.  In  the  case  of  subordinated  convertible
debentures, the holders' claims on assets  and earnings are subordinated to  the
claims  of  other creditors,  and  are senior  to  the claims  of  preferred and
 
                                       11
<PAGE>
common shareholders. In the  case of convertible  preferred stock, the  holders'
claims  on assets and earnings  are subordinated to the  claims of all creditors
and are senior to the claims of common shareholders.
 
    Every convertible security may be valued,  on a theoretical basis, as if  it
did not have a conversion privilege. Such theoretical value is determined by the
yield  it  provides  in  comparison  with  the  yields  of  other  securities of
comparable character and quality which do not have a conversion privilege.  This
theoretical  value, which will change with prevailing interest rates, the credit
standing of the issuer and other pertinent factors, is often referred to as  the
"investment  value,"  and represents  the  security's theoretical  price support
level.
 
    "Conversion value" is the  amount a convertible security  would be worth  in
market  value if  it were  to be  exchanged for  the underlying  equity security
pursuant to its conversion privilege. Conversion value fluctuates directly  with
the  price of the underlying equity  security, usually common stock. If, because
of low prices for the common stock, the conversion value is substantially  below
the  investment  value,  the  price  of  the  convertible  security  is governed
principally by  the  factors  described  in  the  preceding  paragraph.  If  the
conversion  value rises  near or  above its investment  value, the  price of the
convertible security  generally will  rise above  its investment  value and,  in
addition,  will sell  at some  premium over  its conversion  value. This premium
represents the  price  investors  are  willing  to  pay  for  the  privilege  of
purchasing  a fixed-income security  with a possibility  of capital appreciation
due to the conversion privilege. If this appreciation potential is not realized,
this premium may not be recovered.
 
    To the  degree that  the price  of a  convertible security  rises above  its
investment  value  because  of  a rise  in  price  of the  common  stock,  it is
influenced more  by price  fluctuations of  the  common stock  and less  by  its
investment  value.  The  price  of  a  convertible  security  that  is supported
principally by its  conversion value will  rise along with  any increase in  the
price  of the common stock, and such price generally will decline along with any
decline in the price of the common  stock except that the security will  receive
additional  support  as its  price  approaches investment  value.  A convertible
security purchased  or held  at  a time  when its  price  is influenced  by  its
conversion   value  will  produce  a  lower  yield  than  nonconvertible  senior
securities with  comparable investment  values.  Convertible securities  may  be
purchased  by the  Fund at  varying price  levels above  their investment values
and/or their conversion values in keeping with the Fund's investment objectives.
 
    CORPORATE FIXED-INCOME SECURITIES.  As discussed in the Prospectus, in order
to generate the current income needed  to achieve its investment objective,  the
Fund  may invest in investment  grade non-convertible fixed-income securities as
well as  in  such  securities  which  are in  the  lower  rating  categories  of
recognized  rating agencies (Standard & Poor's Corporation and Moody's Investors
Service, Inc.) or which are not  rated by such agencies. The Investment  Manager
will  perform its  own credit  analyses in  addition to  using recognized rating
agencies  and  other  sources.  In  making  such  credit  analyses,  substantial
consideration  will be given to a determination of value based upon, among other
things, anticipated cash flows, interest  or dividend coverage, asset  coverage,
earnings,  experience of the issuer, responsiveness to changes in interest rates
and business conditions and liquidation value relative to the market price.
 
   
    WHEN, AS AND IF ISSUED SECURITIES.  As discussed in the Prospectus, the Fund
may purchase securities  on a "when,  as and  if issued" basis  under which  the
issuance of the security depends upon the occurrence of a subsequent event, such
as  approval of  a merger,  corporate reorganization,  leveraged buyout  or debt
restructuring. The commitment for the purchase of any such security will not  be
recognized  in the portfolio of the Fund until the Investment Manager determines
that issuance of the security  is probable. At such  time, the Fund will  record
the  transaction and, in determining its net asset value, will reflect the value
of the security daily. At such time,  the Fund will also establish a  segregated
account  with  its  custodian  bank  in which  it  will  maintain  cash  or cash
equivalents or other liquid  portfolio securities equal  in value to  recognized
commitments for such securities. Once a segregated account has been established,
if  the anticipated event does not occur  and the securities are not issued, the
Fund will  have  lost  an  investment  opportunity.  The  value  of  the  Fund's
commitments to
    
 
                                       12
<PAGE>
purchase  the  securities of  any one  issuer,  together with  the value  of all
securities of such issuer owned by the Fund,  may not exceed 5% of the value  of
the  Fund's total  assets at  the time the  initial commitment  to purchase such
securities is made  (see "Investment  Restrictions"). Subject  to the  foregoing
restrictions,  the Fund may purchase securities  on such basis without limit. An
increase in the  percentage of the  Fund's assets committed  to the purchase  of
securities  on a "when, as  and if issued" basis  may increase the volatility of
its net asset value. The Investment Manager and the Trustees do not believe that
the net asset value of  the Fund will be adversely  affected by its purchase  of
securities  on such basis. The Fund may also  sell securities on a "when, as and
if issued"  basis  provided  that  the issuance  of  the  security  will  result
automatically from the exchange or conversion of a security owned by the Fund at
the time of sale.
 
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) and facilitate the reallocation of  the Fund's assets into and  out
of  equities and fixed-income  securities 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 and equity
securities  are  listed  on  Exchanges  (currently  the  Chicago  Board  Options
Exchange,  American  Stock  Exchange,  New York  Stock  Exchange,  Pacific Stock
Exchange and Philadelphia  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
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.
 
    OPTIONS ON TREASURY BONDS  AND NOTES.  Because  trading interest in  options
written  on  Treasury bonds  and  notes tends  to  center 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 they will
be treated as being covered.
 
    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
 
                                       13
<PAGE>
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  primary  U.S.  Government  securities  dealers
recognized by the Federal Reserve Bank of New York.
 
    COVERED CALL WRITING.  The Fund  is permitted to write covered call  options
on  portfolio  securities,  without limit,  in  order  to aid  in  achieving its
investment objective. 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 high  grade debt  obligations  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.
 
    As regards  listed options  and  certain over-the-counter  ("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  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.
 
                                       14
<PAGE>
    Options written by a Fund normally have expiration dates of from up to  nine
months (equity securities) to eighteen months (fixed-income securities) 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. See "Risks of Options Transactions," below.
 
    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 the
Fund maintains, in a segregated account  maintained on its behalf at the  Fund's
Custodian, cash, U.S. Government securities or other high grade debt obligations
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  high  grade debt
obligations 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).
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) while  the  potential  loss  equals the
difference 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 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  option would
generally be acquired from the  dealer or financial institution which  purchased
the call written by the Fund.
 
    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  when it  was
purchased. 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
 
                                       15
<PAGE>
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 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  covered
put  option writer who is unable to  effect a closing purchase transaction 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 covered put
writer would be unable to utilize the amount held in cash or U.S. Government  or
other  high grade short-term  debt obligations as  cover 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.  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). In addition, 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.
 
    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.
 
    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.
 
                                       16
<PAGE>
    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.
 
    FUTURES CONTRACTS.  The  Fund may purchase and  sell futures contracts  that
are  traded on  U.S. commodity exchanges  on such underlying  securities as U.S.
Treasury bonds,  notes and  bills. 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.
 
    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 the Fund's Custodian,  in a segregated account  in the name of the
broker  performing  the  transaction,  an  "initial  margin"  of  cash  or  U.S.
Government  securities  or  other  high grade  short-term  obligations  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 mark-to-market daily and the Fund
may  be  required  to  make  subsequent  deposits  of  cash  or  U.S. Government
securities called "variation margin", with the Fund's futures contract  clearing
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), 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
 
                                       17
<PAGE>
increase  in interest rates and the resulting  negative impact on the value of a
portion of  its fixed-income  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.
 
    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 securities held  by the Fund.  However, it is possible
that the futures  market may advance  and the  value of securities  held in  the
portfolio  of the Fund may decline. If  this occurred, the Fund would lose money
on the futures contract and also experience a decline in value of its  portfolio
securities. However, while this could occur for a very brief period or to a very
small  degree, over time the value of  a diversified portfolio will tend to move
in the same direction as the futures contracts.
 
    If the Fund purchases  a futures contract to  hedge against the increase  in
value  of  securities  it intends  to  buy,  and the  value  of  such securities
decreases, then  the Investment  Manager  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
 
                                       18
<PAGE>
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 high grade debt  obligations 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  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 addition, 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.
 
    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 brokers
or financial institutions deemed creditworthy by the Investment Manager.
 
    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
and  indexes  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 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 relationship
between the debt securities and futures markets 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
 
                                       19
<PAGE>
and because of  the imperfect  correlation between  movements in  the prices  of
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.
 
    The  extent to which the Fund  may enter into transactions involving futures
contracts and options  thereon may  be limited  by the  Internal Revenue  Code's
requirements  for qualification as a regulated investment company and the Fund's
intention to qualify as  such (see "Dividends, Distributions  and Taxes" in  the
Prospectus).
 
    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 contract or underlying 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.
 
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 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 Trust 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  Trustees of the
Fund.
 
                                       20
<PAGE>
   
    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. However,  the
Fund  did not lend any of its  portfolio securities during the fiscal year ended
September 30,  1996 and  it has  no intention  of doing  so in  the  foreseeable
future.
    
 
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 Fund
will receive 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  and  may exceed  one  year.  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  by the  Investment Manager
subject to procedures established by the Trustees. 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. The Fund did not enter  into
any repurchase agreements during the fiscal year ended September 30, 1996, in an
amount greater than 5% of its net assets.
    
 
ZERO COUPON SECURITIES
 
    A  portion of  the securities  purchased by  the Fund  may be  "zero coupon"
Treasury securities. These are U.S. Treasury  bills, notes and bonds which  have
been  stripped of  their unmatured  interest coupons  and receipts  or which are
certificates representing  interests  in  such  stripped  debt  obligations  and
coupons.  "Zero coupon" securities  are purchased at a  discount from their face
amount, giving the purchaser the right to receive their full value at  maturity.
A zero coupon security pays no interest to its holder during its life. Its value
to  an investor consists of the difference between its face value at the time of
maturity and the price for which it  was acquired, which is generally an  amount
significantly  less  than  its face  value  (sometimes  referred to  as  a "deep
discount" price).
 
    The  interest  earned  on  such  securities  is,  implicitly,  automatically
compounded  and paid out at maturity. While  such compounding at a constant rate
eliminates the risk of receiving lower  yields upon reinvestment of interest  if
prevailing  interest rates decline, the owner of  a zero coupon security will be
unable to participate in higher yields upon reinvestment of interest received if
prevailing interest  rates rise.  For this  reason, zero  coupon securities  are
subject  to substantially  greater market  price fluctuations  during periods of
changing prevailing interest  rates than  are comparable  debt securities  which
make
 
                                       21
<PAGE>
current  distributions  of interest.  Current federal  tax  law requires  that a
holder (such as  the Fund) of  a zero coupon  security accrue a  portion of  the
discount at which the security was purchased as income each year even though the
Fund receives no interest payments in cash on the security during the year.
 
    Currently  the only  U.S. Treasury  security issued  without coupons  is the
Treasury bill. However, in the  last few years a  number of banks and  brokerage
firms  have  separated  ("stripped")  the  principal  portions  from  the coupon
portions of the U.S. Treasury  bonds and notes and  sold them separately in  the
form  of  receipts of  certificates  representing undivided  interests  in these
instruments (which instruments are  generally held by a  bank in a custodial  or
trust account).
 
WARRANTS
 
   
    The  Fund may invest  up to 5% of  its net assets in  warrants, but not more
than 2% of such assets in warrants not listed on either the New York or American
Stock  Exchange.  However,  the  acquisition  of  warrants  attached  to   other
securities  is  not  subject  to  this limitation.  For  the  fiscal  year ended
September 30, 1996, the Fund's investments in warrants did not exceed 5% of  its
net assets.
    
 
FOREIGN SECURITIES
 
    The  Fund may invest  in securities of foreign  companies. However, the Fund
will not invest more than 10% of the  value of its total assets, at the time  of
purchase,  in  foreign securities  (other  than securities  of  Canadian issuers
registered under  the Securities  Exchange Act  of 1934  or American  Depository
Receipts,  on which  there is  no such  limit). Investments  in certain Canadian
issuers may be speculative due to certain political risks and may be subject  to
substantial  price fluctuations. Foreign securities  investments may be affected
by changes  in  currency  rates  or exchange  control  regulations,  changes  in
governmental administration or economic or monetary policy (in the United States
and  abroad) or changed circumstances in  dealings between nations. Costs may be
incurred in connection with conversions  between various currencies held by  the
Fund.
 
   
    The  Fund may invest  in securities of foreign  companies. Dividends paid by
foreign issuers may be subject to withholding and other foreign taxes which  may
decrease the net return on such investments as compared to dividends paid to the
Fund  by  domestic corporations.  It  should be  noted  that there  may  be less
publicly  available  information  about  foreign  issuers  than  about  domestic
issuers, and foreign issuers are not subject to uniform accounting, auditing and
financial  reporting standards and requirements  comparable to those of domestic
issuers. Securities of some  foreign issuers are less  liquid and more  volatile
than securities of comparable domestic issuers and foreign brokerage commissions
are  generally higher than in the  United States. Foreign securities markets may
also be less liquid,  more volatile and less  subject to government  supervision
than  those in the United States. The Fund may be affected either unfavorably or
favorably by  fluctuations in  the relative  rates of  exchange as  between  the
currencies of different nations and exchange control regulations. Investments in
foreign  countries could be affected by other  factors not present in the United
States,   including   expropriation,   confiscatory   taxation   and   potential
difficulties  in  enforcing  contractual  obligations.  Securities  purchased on
foreign exchanges will  be held in  custody by  a foreign branch  of a  domestic
bank. During the fiscal year ended September 30, 1996, the Fund did not purchase
any foreign securities in an amount greater than 5% of its net assets.
    
 
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%.  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. During the fiscal
year ended September 30, 1996, the Fund's portfolio turnover rate was 170.61%.
    
 
                                       22
<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  or sell  commodities except  that  the Fund  may purchase
    financial futures contracts and related options thereon.
 
         4. 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.
 
         5.  Purchase  securities  of  other  investment  companies,  except  in
    connection with a  merger, consolidation, reorganization  or acquisition  of
    assets.
 
         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 and  variation margin  for
    futures are not deemed to be pledges of assets and such arrangements are not
    deemed  to be the issuance of a  senior security as set forth in restriction
    (7).)
 
         7. 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  repurchase agreement; (b)  borrowing money in  accordance
    with  restrictions described above and in the Prospectus; (c) purchasing any
    securities on  a  when-issued or  delayed  delivery basis;  or  (d)  lending
    portfolio securities.
 
         8.  Make loans of money  or securities, except: (a)  by the purchase of
    debt obligations in which the Fund may invest consistent with its investment
    objectives and policies; (b) by investment in repurchase agreements; or  (c)
    by lending its portfolio securities.
 
         9.  Make short sales of securities or maintain a short position, unless
    at all times when a short position is open it either owns an equal amount of
    such securities or  owns securities  which, without payment  of any  further
    consideration,  are convertible into  or exchangeable for  securities of the
    same issue as, and equal in amount to, the securities sold short.
 
        10. Purchase securities on margin,  except for such short-term loans  as
    are  necessary for  the clearance  of portfolio  securities. 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.
 
        11. 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.
 
                                       23
<PAGE>
        12.  Invest for the  purpose of exercising control  or management of any
    other issuer.
 
    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.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
- --------------------------------------------------------------------------------
 
   
    Subject to the general supervision  of the Trustees, the Investment  Manager
is  responsible for decisions  to buy and sell  securities and futures contracts
for the Fund, the  selection of brokers and  dealers to effect the  transactions
and  the negotiation  of brokerage commissions,  if any. Purchases  and sales of
securities on  a  stock exchange  are  effected  through brokers  who  charge  a
commission  for their services.  In the over-the-counter  market, securities are
generally traded on a "net" basis with dealers acting as principal for their own
accounts without a stated commission, although the price of the security usually
includes a profit to the dealer. Option and futures transactions will usually be
effected through a broker and a commission will be charged.
    
 
    The Fund  also  expects  that  securities will  be  purchased  at  times  in
underwritten  offerings where the price includes a fixed amount of compensation,
generally referred to as the underwriter's concession or discount. On  occasion,
the  Fund may  also purchase certain  money market instruments  directly from an
issuer, in which case no commissions or discounts are paid.
 
   
    The Investment Manager currently serves as investment manager to a number of
clients, including other  investment companies,  and may  in the  future act  as
investment  manager or adviser to  others. It is the  practice of the Investment
Manager to cause purchase and sale  transactions to be allocated among the  Fund
and  others whose  assets it manages  in such  manner as it  deems equitable. In
making such  allocations  among the  Fund  and other  client  accounts,  various
factors  may be considered, including  are 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  aggregate amount of  brokerage commissions paid by  the Fund during the
fiscal years ended September 30, 1994, 1995 and 1996 was $401,973, $233,311  and
$162,895, respectively.
    
 
    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.
 
    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
 
                                       24
<PAGE>
   
value of such  services. During the  fiscal year ended  September 30, 1996,  the
Fund  directed payment of  $146,315 in brokerage  commissions in connection with
transactions in  the  aggregate amount  of  $65,300,473 to  brokers  because  of
research services provided.
    
 
    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.
 
   
    Consistent with  the  policy  described  above,  brokerage  transactions  in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected  through DWR. In order for DWR to effect portfolio transactions for the
Fund, the  commissions, fees  or  other remuneration  received  by DWR  must  be
reasonable and fair compared to the commissions, fees or other remuneration paid
to  other brokers in  connection with comparable  transactions involving similar
securities being purchased or sold on an exchange during a comparable period  of
time.  This standard would  allow DWR to  receive no more  than the remuneration
which would  be  expected  to  be  received  by  an  unaffiliated  broker  in  a
commensurate  arm's-length transaction.  Furthermore, the Trustees  of the Fund,
including a majority  of the Trustees  who are not  "interested" Trustees,  have
adopted   procedures  which  are   reasonably  designed  to   provide  that  any
commissions, fees or  other remuneration  paid to  DWR are  consistent with  the
foregoing  standard. During the fiscal years  ended September 30, 1994, 1995 and
1996, the Fund paid  a total of $31,360,  $27,100 and $11,922, 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  DWR. During  the fiscal  year ended  September 30,  1996, the  brokerage
commissions  paid to DWR represented approximately  7.32% 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 7.60% of
the aggregate dollar value of all portfolio transactions of the Fund during  the
year for which commissions were paid.
    
 
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 DWDC. 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) at  their
meeting  held on October  30, 1992, approved  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. The Distribution Agreement took effect
on June 30, 1993 upon  the spin-off by Sears, Roebuck  and Co. of its  remaining
shares  of DWDC. By  its terms, the  Distribution Agreement had  an initial term
ending April 20, 1995, and provides that  it will remain in effect from year  to
year  thereafter if approved  by the Board.  At their meeting  held on April 17,
1996, the  Trustees, including  all of  the Independent  Trustees, approved  the
continuation of the Agreement until April 30, 1997.
    
 
    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  registering the  Fund  and its  shares  under federal  and  state
securities  laws. The  Fund and  the Distributor  have agreed  to indemnify each
other
 
                                       25
<PAGE>
against certain liabilities, including liabilities  under the Securities Act  of
1933,  as amended.  Under the Distribution  Agreement, the  Distributor uses its
best efforts in rendering services  to the Fund, but  in the absence of  willful
misfeasance,   bad  faith,  gross  negligence   or  reckless  disregard  of  its
obligations,  the  Distributor  is  not  liable  to  the  Fund  or  any  of  its
shareholders  for any  error of  judgment or mistake  of law  or for  any act of
omission or for any losses sustained by the Fund or its shareholders.
 
PLAN OF DISTRIBUTION
 
   
    To compensate the  Distributor for  the services provided  and the  expenses
borne  by  the  Distributor  or  any  selected  dealer  under  the  Distribution
Agreement, the Fund has  adopted a Plan of  Distribution pursuant to Rule  12b-1
under  the Act  (the "Plan")  pursuant to  which the  Fund pays  the Distributor
compensation accrued daily and payable monthly at the annual rate of 1.0% of the
lesser of: (a)  the average  daily aggregate gross  sales of  the Fund's  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 shares redeemed since the Fund's inception upon which a contingent
deferred  sales charge  has been  imposed or waived,  or (b)  the Fund's average
daily net  assets. The  Distributor  also receives  the proceeds  of  contingent
deferred  sales  charges imposed  on certain  redemptions  of shares,  which are
separate and apart from  payments made pursuant to  the Plan. (see  "Redemptions
and  Repurchases --  Contingent Deferred Sales  Charge" in  the Prospectus). The
Distributor has  informed the  Fund that  it and/or  DWR received  approximately
$38,000,  $76,212  and $144,945  in contingent  deferred  sales charges  for the
fiscal years ended  September 30,  1994, 1995  and 1996,  respectively, none  of
which was retained by the Distributor.
    
 
    The  Distributor has informed the Fund that a portion of the fees payable by
the Fund each year  pursuant to the  Plan equal to 0.25%  of the Fund's  average
daily  net assets is  characterized as a  "service fee" under  the Rules of Fair
Practice of the National Association of  Securities Dealers, Inc. (of which  the
Distributor is a member). Such portion of the fee is a payment made for personal
service and/or the maintenance of shareholder accounts. The remaining portion of
the  Plan fees  payable by  the Fund is  characterized as  an "asset-based sales
charge" as such is defined by the aforementioned Rules of Fair Practice.
 
   
    Under its terms, the Plan had an initial term ending December 31, 1985,  and
provides  that it will remain  in effect from year  to year thereafter, provided
such continuance is  approved annually by  a vote of  the Trustees, including  a
majority  of  the Trustees  who are  not  "interested persons"  of the  Fund (as
defined in the Act) and who have no direct or indirect financial interest in the
operation of the Plan (the "Independent 12b-1 Trustees"). The Plan was submitted
to and approved  by the shareholders  at the Annual  Meeting of Shareholders  on
December  29, 1986. Continuation of  the Plan was most  recently approved by the
Trustees, including a majority of the  Independent 12b-1 Trustees, on April  17,
1996 at a meeting called for the purpose of voting on such Plan. At that meeting
the  Trustees  and  the Independent  12b-1  Trustees, after  evaluating  all the
information they deemed necessary to  make an informed determination of  whether
the  Plan should be continued, approved the continuation of the Plan until April
30, 1997. The determination was based  upon the conclusion of the Trustees  that
the  Plan provides an effective means of stimulating sales of shares of the Fund
and of reducing or avoiding net redemptions and the potentially adverse  effects
that may occur therefrom.
    
 
    At  their  meeting held  on  October 30,  1992,  the Trustees  of  the Fund,
including all of the Independent 12b-1 Trustees, approved certain amendments  to
the  Plan which took  effect in January,  1993 and were  designed to reflect the
fact that  upon  the  reorganization  described  above  the  share  distribution
activities  theretofore  performed  for the  Fund  by  DWR were  assumed  by the
Distributor and DWR's sales activities are  now being performed pursuant to  the
terms  of  a selected  dealer  agreement between  the  Distributor and  DWR. The
amendments provide that payments under the Plan will be made to the  Distributor
rather  than to DWR as before the amendment, and that the Distributor in turn is
authorized  to  make  payments  to   DWR,  its  affiliates  or  other   selected
broker-dealers  (or  direct  that  the Fund  pay  such  entities  directly). The
Distributor is also authorized  to retain part of  such fee as compensation  for
its  own distribution-related expenses. At a meeting held on April 28, 1993, the
Trustees,  including   a   majority   of   the   Independent   12b-1   Trustees,
 
                                       26
<PAGE>
approved  certain technical  amendments to  the Plan  in connection  with recent
amendments adopted by the  National Association of  Securities Dealers, Inc.  to
its  Rules of Fair Practice.  At a special meeting held  on December 19, 1995, a
majority of the shareholders of the Fund,  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 holding of such shares, of an
investment company  whose  assets  are  acquired  by  the  Fund  in  a  tax-free
reorganization.  The shareholders approved the  Amendment in connection with the
Acquisition of the assets of TCW/DW Convertible Trust.
 
   
    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  to  the
Distributor, under the Plan, during the fiscal year ended September 30, 1996, of
$2,057,104.  This amount is equal to payments required to be paid monthly by the
Fund which were computed  at the annual  rate of 1.0% of  the average daily  net
assets of the Fund 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.
    
 
    The Plan was  adopted in order  to permit the  implementation of the  Fund's
method  of distribution. Under this distribution  method, shares of the Fund are
sold without a sales load  being deducted at the time  of purchase, so that  the
full amount of an investor's purchase payment will be invested in shares without
any  deduction  for  sales charges.  Shares  of the  Fund  may be  subject  to a
contingent deferred sales charge, payable to the Distributor, if redeemed during
the six years after  their purchase. DWR compensates  its account executives  by
paying  them, from its own funds, commissions for the sale of the Fund's shares,
currently a gross  sales credit of  up to 5%  of the amount  sold and an  annual
residual  commission of  up to 0.25  of 1%  of the current  value (not including
reinvested dividends  or distributions)  of  the amount  sold. 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
overhead  and  sales compensation.  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 DWR's 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, such assumed  interest (computed  at the  "broker's call  rate") has  been
calculated on the gross sales credit as it is reduced by amounts received by the
Distributor  under the Plan and any contingent deferred sales charge 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 $2,057,104  accrued under the Plan for the  fiscal
year  ended  September 30,  1996  to the  Distributor.  The Distributor  and DWR
estimate that they have spent, pursuant  to the Plan, $164,729,040 on behalf  of
the  Fund since the inception of the Fund.  It is estimated that this amount was
spent in approximately the following ways: (i) 1.51% ($2,494,229) -- advertising
and promotional expenses;  (ii) 0.33%  ($546,760) printing  of prospectuses  for
distribution to other than current shareholders; and (iii) 98.16% ($161,688,051)
- --  other expenses, including the gross sales credit and the carrying charge, of
which 25.97%  ($41,986,304) represents  carrying charges,  30.32%  ($49,018,091)
represents  commission credits to DWR branch offices for payments of commissions
to account executives, 42.80% ($69,211,748) represents overhead and other branch
office distribution-related expenses  and 0.91%  ($1,471,908) represents  excess
distribution  expenses of  TCW/DW Global  Convertible Trust,  the net  assets of
which were combined with those of the  Fund on December 22, 1995 pursuant to  an
Agreement and Plan of Reorganization. The term "overhead and other branch office
distribution-related  expenses" represents  (a) the expenses  of operating DWR's
branch offices  in connection  with the  sale of  Fund shares,  including  lease
costs,  the  salaries  and employee  benefits  of operations  and  sales support
personnel, utility costs, communications costs  and the costs of stationery  and
supplies,  (b) the costs of client sales seminars, (c) travel expenses of mutual
fund sales  coordinators  to promote  the  sale of  Fund  shares and  (d)  other
expenses relating to branch promotion of Fund share sales.
    
 
                                       27
<PAGE>
   
    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
the excess expenses, including the  carrying charge designed to approximate  the
opportunity  costs incurred  by DWR which  arise from it  having advanced monies
without having received the amount of any  sales charges imposed at the time  of
sale  of  the Fund's  shares,  totalled $71,800,910  as  of September  30, 1996.
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, this excess amount does not constitute a  liability
of  the Fund. Although there is no legal obligation for the Fund to pay expenses
incurred in excess of payments  made to the Distributor  under the Plan and  the
proceeds  of contingent deferred sales charges paid by investors upon redemption
of shares, if for any reason the Plan is terminated, the Trustees will  consider
at that time the manner in which to treat such expenses. Any cumulative expenses
incurred, but not yet recovered through distribution fees or contingent deferred
sales  charges, may or may not be  recovered through future distribution fees or
contingent deferred sales charges.
    
 
    No interested person of the Fund nor any  Trustee of the Fund who is not  an
interested  person of the Fund, as defined  in the Act, has any direct financial
interest in the operation of the Plan except to the extent that the Distributor,
InterCapital, DWSC and DWR or certain of  their employees may be deemed to  have
such  an interest as a result of  benefits derived from the successful operation
of the  Plan or  as a  result of  receiving a  portion of  the amounts  expended
thereunder by the Fund.
 
    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
Fund,  and all  material amendments  to the  Plan must  also be  approved by the
Trustees in the manner described above. The Plan may be terminated at any  time,
without  payment of any penalty, by vote  of a majority of the Independent 12b-1
Trustees or by a vote of a majority of the outstanding voting securities of  the
Fund (as defined in the Act) on not more than thirty days' written notice to any
other  party to the  Plan. So long  as the Plan  is in effect,  the election and
nomination of Independent 12b-1 Trustees shall be committed to the discretion of
the Independent 12b-1 Trustees.
 
DETERMINATION OF NET ASSET VALUE
 
    As stated in the Prospectus, short-term securities with remaining maturities
of sixty days  or less at  the time of  purchase are valued  at amortized  cost,
unless  the  Trustees determine  such does  not  reflect the  securities' market
value, in which  case these securities  will be  valued at their  fair value  as
determined by the Trustees. Other short-term debt securities will be valued on a
mark-to-market basis until such time as they reach a remaining maturity of sixty
days,  whereupon they will be valued at  amortized cost using their value on the
61st day unless  the Trustees determine  such does not  reflect the  securities'
market  value, in which case these securities will be valued at their fair value
as determined by the Trustees. Listed  options on debt securities 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 on debt
securities and all options on equity  securities 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.
 
    The net asset value per share of  the Fund is determined once daily at  4:00
p.m. New York time (or, on days when the New York Stock Exchange closes prior to
4:00  p.m., at such earlier time), on each  day that the New York Stock Exchange
is open and on each other day in  which there is a sufficient degree of  trading
in  the Fund's investments  to affect the  net asset value,  except that the net
asset value may  not be computed  on a day  on which no  orders to purchase,  or
tenders  to sell or redeem, Fund shares  have been received, by taking the value
of all  assets  of  the  Fund, subtracting  its  liabilities,  dividing  by  the
 
                                       28
<PAGE>
number  of shares outstanding  and adjusting to  the nearest cent.  The New York
Stock Exchange  currently  observes  the following  holidays:  New  Year's  Day;
President's  Day;  Good  Friday;  Memorial  Day;  Independence  Day;  Labor Day;
Thanksgiving Day; and Christmas Day.
 
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  Fund's
Transfer  Agent, Dean  Witter Trust Company  (the "Transfer Agent").  This is an
open account in which shares owned by the investor are credited by the  Transfer
Agent  in lieu  of issuance of  a share  certificate. 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  Fund,  unless the
shareholder requests that they be paid in  cash. Each purchase of shares of  the
Fund is made upon the condition that the Transfer Agent is thereby automatically
appointed  as agent of the  investor to receive all  dividends and capital gains
distributions on shares owned by the investor. Such dividends and  distributions
will  be paid, at the  net asset value per  share, in shares of  the Fund (or in
cash if the shareholder so requests) as  of the close of business on the  record
date.  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 record  date of the dividend or  distribution. In the case of
recently purchased  shares for  which registration  instructions have  not  been
received on the 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 an open-end Dean Witter Fund other than Dean
Witter Convertible Securities Trust. Such  investment will be made as  described
above for automatic investment in shares 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 Dean Witter Fund  targeted
to  receive  investments from  dividends  at the  time  they enter  the Targeted
Dividends program. Investors should review  the prospectus of the targeted  Dean
Witter Fund before entering the program.
 
    EASYINVEST.-SM-    Shareholders may  subscribe  to EasyInvest,  an automatic
purchase plan  which  provides  for  any  amount  from  $100  to  $5,000  to  be
transferred automatically from a checking or savings account, on a semi-monthly,
monthly  or quarterly basis, to  the Transfer Agent for  investment in shares of
the 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.  Any shareholder
who receives a cash payment representing  a dividend or distribution may  invest
such  dividend or distribution at the net asset value, without the imposition of
a contingent deferred sales  charge 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
 
                                       29
<PAGE>
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  contingent deferred  sales  charge  will  be
imposed  on  shares redeemed  under the  Withdrawal  Plan (see  "Redemptions and
Repurchases--Contingent Deferred  Sales  Charge").  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  contingent
deferred  sales charge)  to the  shareholder will  be the  designated monthly or
quarterly amount.
 
    The Transfer Agent  acts as agent  for the shareholder  in tendering to  the
Fund  for redemption sufficient full and fractional shares to provide the amount
of the periodic  withdrawal payment  designated in the  application. The  shares
will  be  redeemed at  their net  asset value  determined, at  the shareholder's
option, on the tenth or twenty-fifth day (or next following business day) of the
relevant month or quarter and normally a  check for the proceeds will be  mailed
by  the Transfer  Agent, or  amounts credited  to a  shareholder's DWR  or other
selected broker-dealer brokerage  account, within five  business days after  the
date  of redemption. The  Withdrawal Plan may  be terminated at  any time by the
Fund.
 
    Withdrawal Plan payments should  not be considered  as dividends, yields  or
income.  If periodic withdrawal plan payments continuously exceed net investment
income and  net capital  gains, the  shareholder's original  investment will  be
correspondingly reduced and ultimately exhausted.
 
    Each  withdrawal constitutes  a redemption  of shares  and any  gain or loss
realized must  be  recognized for  federal  income tax  purposes.  Although  the
shareholder  may  make  additional  investments  of  $2,500  or  more  under the
Withdrawal Plan,  withdrawals made  concurrently  with purchases  of  additional
shares  may  be  inadvisable because  of  the contingent  deferred  sales charge
applicable to the redemption of shares purchased during the preceding six  years
(see "Redemption and Repurchases -- Contingent Deferred Sales Charge").
 
    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. Shareholders wishing to enroll  in
the  Withdrawal  Plan should  contact their  account  executive or  the Transfer
Agent.
 
    DIRECT INVESTMENTS THROUGH TRANSFER AGENT.  As discussed in the  Prospectus,
a  shareholder may  make additional  investments in Fund  shares at  any time by
sending a  check in  any amount,  not less  than $100,  payable to  Dean  Witter
Convertible  Securities  Trust,  directly  to the  Fund's  Transfer  Agent. Such
amounts will be applied to  the purchase of Fund shares  at the net asset  value
per  share next determined after receipt of the check or purchase payment by the
Transfer Agent.  The shares  so purchased  will be  credited to  the  investor's
account.
 
                                       30
<PAGE>
    TAX-SHELTERED  RETIREMENT PLANS.  Retirement plans  are available for use by
corporations, the self-employed,  Individual Retirement  Accounts and  Custodial
Accounts  under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax adviser.
 
    For further information  regarding plan administration,  custodial fees  and
other   details,  investors   should  contact   their  DWR   or  other  selected
broker-dealer account executive or the Transfer Agent.
 
EXCHANGE PRIVILEGE
 
    As discussed in the Prospectus, the Fund makes available to its shareholders
an Exchange Privilege whereby shareholders of the Fund may exchange their shares
for shares of  other Dean  Witter Funds sold  with a  contingent deferred  sales
charge  ("CDSC funds"), and  for shares of Dean  Witter Short-Term U.S. Treasury
Trust, Dean Witter  Limited Term  Municipal Trust, Dean  Witter Short-Term  Bond
Fund,  Dean Witter Balanced Growth Fund,  Dean Witter Balanced Income Fund, Dean
Witter Intermediate Term U.S.  Treasury Trust and five  Dean Witter Funds  which
are  money market  funds (the  foregoing eleven  non-CDSC funds  are hereinafter
referred to as the "Exchange Funds"). Exchanges may be made after the shares  of
the  Fund acquired by  purchase (not by exchange  or dividend reinvestment) have
been held for thirty days.  There is no waiting  period for exchanges of  shares
acquired  by exchange or dividend reinvestment.  An exchange will be treated for
federal income tax purposes the same as a repurchase or redemption of shares, on
which the shareholder may realize a capital gain or loss.
 
    Any new account  established through  the Exchange Privilege  will have  the
same registration and cash dividend or dividend reinvestment plan as the present
account,  unless  the  Transfer  Agent  receives  written  notification  to  the
contrary. For  telephone  exchanges,  the exact  registration  of  the  existing
account and the account number must be provided.
 
    Any  shares  held  in  certificate  form cannot  be  exchanged  but  must be
forwarded to the  Transfer Agent  and deposited into  the shareholder's  account
before  being eligible for exchange. (Certificates  mailed in for deposit should
not be endorsed.)
 
    As described  below, and  in  the Prospectus  under the  captions  "Exchange
Privilege"  and "Contingent Deferred Sales  Charge", a contingent deferred sales
charge ("CDSC")  may be  imposed upon  a redemption,  depending on  a number  of
factors,  including the number of years from the time of purchase until the time
of redemption or  exchange ("holding period").  When shares of  the Fund or  any
other  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 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  CDSC fund  from the Exchange
Fund, with  no  charge  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 CDSC fund  are
reacquired.  A CDSC is imposed only upon  an ultimate redemption, based upon the
time (calculated as  described above)  the shareholder  was invested  in a  CDSC
fund.
 
    In  addition, shares of the  Fund may be acquired  in exchange for shares of
Dean Witter Funds sold  with a front-end sales  charge ("front-end sales  charge
funds")  but shares  of the  Fund, however  acquired, may  not be  exchanged for
shares of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired  in
exchange  for shares of a front-end sales charge fund (or in exchange for shares
of other Dean Witter  Funds for which  shares of a  front-end sales charge  fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
                                       31
<PAGE>
    When  shares initially purchased in a CDSC  fund are exchanged for shares of
another CDSC fund, or for  shares of an Exchange Fund,  the date of purchase  of
the shares of the fund exchanged into, for purposes of the CDSC upon redemption,
will  be the  last day  of the month  in which  the shares  being exchanged were
originally purchased.  In allocating  the purchase  payments between  funds  for
purposes  of the CDSC the amount which represents the current net asset value of
shares at the time of the exchange  which were (i) purchased more than three  or
six years (depending on the CDSC schedule applicable to the shares) prior to the
exchange,   (ii)  originally  acquired  through  reinvestment  of  dividends  or
distributions and  (iii) acquired  in  exchange for  shares of  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 (all such shares called  "Free
Shares"),  will be  exchanged first. Shares  of Dean Witter  American Value Fund
acquired prior  to  April  30,  1984, shares  of  Dean  Witter  Dividend  Growth
Securities  Inc. and  Dean Witter  Natural Resource  Development Securities Inc.
acquired prior  to July  2, 1984,  and  shares of  Dean Witter  Strategist  Fund
acquired  prior to November 8, 1989, are also considered Free Shares and will be
the first Free Shares to be  exchanged. After an exchange, all dividends  earned
on  shares in 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  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 which  are subject to a lower  CDSC rate will be  exchanged
prior  to the  shares of  that block that  are subject  to a  higher CDSC rate).
Shares equal to any appreciation in the value of non-Free Shares exchanged  will
be  treated as  Free Shares,  and the  amount of  the purchase  payments for the
non-Free Shares of the fund  exchanged into will be equal  to the lesser of  (a)
the  purchase payments for, or (b) the current net asset value of, the exchanged
non-Free Shares. If an exchange between  funds would result in exchange of  only
part  of  a  particular block  of  non-Free  Shares, then  shares  equal  to any
appreciation in the value of the block  (up to the amount of the exchange)  will
be treated as Free Shares and exchanged first, and the purchase payment for that
block  will be allocated on a pro rata basis between the non-Free Shares of that
block to  be retained  and the  non-Free Shares  to be  exchanged. The  prorated
amount  of such  purchase payment attributable  to the  retained non-Free Shares
will remain as the purchase payment for such shares, and the amount of  purchase
payment for the exchanged non-Free Shares will be equal to the lesser of (a) the
prorated  amount of the purchase payment for, or (b) the current net asset value
of, those exchanged non-Free Shares. Based upon the procedures described in  the
Prospectus  under the caption "Contingent Deferred Sales Charge", any applicable
CDSC will  be  imposed upon  the  ultimate redemption  of  shares of  any  fund,
regardless  of  the  number  of exchanges  since  those  shares  were originally
purchased.
 
    With respect to  the redemption  or repurchase of  shares of  the Fund,  the
application  of proceeds to the purchase of new  shares in the Fund or any other
of the  funds and  the general  administration of  the Exchange  Privilege,  the
Transfer  Agent  acts as  agent for  the Distributor  and for  the shareholder's
selected broker-dealer,  if  any, in  the  performance of  such  functions.  The
Transfer Agent shall be liable for its own negligence and not for the default or
negligence of its correspondents or for losses in transit. The Fund shall not be
liable  for any default or negligence of  the Transfer Agent, the Distributor or
any selected broker-dealer.
 
    The Distributor and any selected broker-dealer have authorized and appointed
the Transfer Agent to act as their  agent in connection with the application  of
proceeds of any redemption of Fund shares to the purchase of shares of any other
fund  and the general administration of the Exchange Privilege. No commission or
discounts will be paid to the Distributor or any selected broker-dealer for  any
transactions pursuant to this Exchange Privilege.
 
   
    Exchanges  are subject to  the minimum investment  requirement and any other
conditions imposed by each fund. (The  minimum initial investment 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,  at their discretion,
accept initial investments of as low as $1,000. The minimum investment for  Dean
Witter  Short-Term U.S.  Treasury Trust is  $10,000, although that  fund, in its
discretion,   may   accept   initial   purchases   as   low   as   $5,000.   The
    
 
                                       32
<PAGE>
   
minimum  initial investment  is $5,000 for  Dean Witter Special  Value Fund. The
minimum initial  investment  for 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 this Exchange Privilege and provided further that the Exchange
Privilege may be terminated  or materially revised without  notice at times  (a)
when the New York Stock Exchange is closed for other than customary weekends and
holidays, (b) when trading on that Exchange is restricted, (c) when an emergency
exists  as a result of which  disposal by the Fund of  securities owned by it is
not reasonably practicable  or it  is not  reasonably practicable  for the  Fund
fairly  to determine the  value of its  net assets, (d)  during any other period
when the Securities and Exchange Commission  by order so permits (provided  that
applicable rules and regulations of the Securities and Exchange Commission shall
govern  as to whether the  conditions prescribed in (b) or  (c) exist) or (e) if
the Fund would be  unable to invest amounts  effectively in accordance with  its
investment objectives, policies and restrictions.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and  shareholders should obtain  a copy and  examine it  carefully
before  investing. An exchange  will be treated for  federal income tax purposes
the same as a repurchase or redemption  of shares, on which the shareholder  may
realize a capital gain or loss. However, the ability to deduct capital losses on
an  exchange may be limited  in situations where there  is an exchange of shares
within ninety days  after the shares  are purchased. The  Exchange Privilege  is
only available in states where an exchange may legally be made.
 
    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 the Fund can be redeemed
for  cash at any time at the net asset value per share next determined; however,
such redemption  proceeds  may  be  reduced by  the  amount  of  any  applicable
contingent  deferred  sales  charges  (see  below).  If  shares  are  held  in a
shareholder's account  without  a  share  certificate,  a  written  request  for
redemption  to the Fund's Transfer Agent at  P.O. Box 983, Jersey City, NJ 07303
is required. If  certificates are  held by the  shareholder, the  shares may  be
redeemed by surrendering the certificates with a written request for redemption.
The  share  certificate, or  an accompanying  stock power,  and the  request for
redemption, must be  signed by the  shareholder or shareholders  exactly as  the
shares  are registered. Each request for  redemption, whether or not accompanied
by a share certificate, must  be sent to the  Fund's Transfer Agent, which  will
redeem  the shares at their net asset value next computed (see "Purchase of Fund
Shares" in the Prospectus)  after it receives the  request, and certificate,  if
any,  in good order. Any redemption request received after such computation will
be redeemed at the next determined net asset value. The term "good order"  means
that  the share  certificate, if  any, and  request for  redemption are properly
signed, accompanied by  any documentation  required by the  Transfer Agent,  and
bear  signature guarantees when required  by the Fund or  the Transfer Agent. If
redemption is requested by a  corporation, partnership, trust or fiduciary,  the
Transfer  Agent may require that written evidence of authority acceptable to the
Transfer Agent be submitted before such request is accepted.
 
                                       33
<PAGE>
   
    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  supplement
to the prospectus or a new prospectus.
    
 
    CONTINGENT DEFERRED SALES CHARGE.  As stated in the Prospectus, a contingent
deferred  sales charge ("CDSC") will be imposed on any redemption by an investor
if after such redemption the current value of the investor's shares of the  Fund
is  less  than the  dollar amount  of all  payments by  the shareholder  for the
purchase of Fund shares during the preceding six 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
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  years.
The  CDSC will be paid to the Distributor.  In addition, no CDSC will be imposed
on redemptions of shares which are attributable to reinvestment of dividends  or
distributions from, or the proceeds of, certain Unit Investment Trusts.
 
    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 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  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  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 Fund  shares until  the time of
redemption of such shares. For purposes of determining the number of years  from
the  time of any payment for the purchase  of shares, all payments made during a
month will be aggregated  and deemed to have  been made on the  last day of  the
month. The following table sets forth the rates of the CDSC:
 
<TABLE>
<CAPTION>
                                                                                              CONTINGENT DEFERRED
                                         YEAR SINCE                                               SALES CHARGE
                                          PURCHASE                                             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>
 
                                       34
<PAGE>
    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 period. This will result in  any such CDSC being imposed at
the  lowest  possible  rate.  Accordingly,  shareholders  may  redeem,   without
incurring  any CDSC,  amounts equal to  any net  increase in the  value of their
shares above the  amount of  their purchase payments  made within  the past  six
years  and amounts equal to the current  value of shares purchased more than six
years prior  to the  redemption  and shares  purchased through  reinvestment  of
dividends  or distributions  or 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.  The CDSC will  be
imposed, in accordance with the table shown above, on any redemptions within six
years of purchase which are in excess of these amounts and which redemptions are
not  (a)  requested  within  one  year  of  death  or  initial  determination of
disability  of  a  shareholder,  or   (b)  made  pursuant  to  certain   taxable
distributions  from retirement plans or retirement accounts, as described in the
Prospectus.
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  As discussed in the Prospectus,
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. The  term  good  order means  that  the  share
certificate, if any, and request for redemption are properly signed, accompanied
by  any  documentation  required  by  the  Transfer  Agent,  and  bear signature
guarantees when required by the Fund or the Transfer Agent. Such payment may  be
postponed  or the right of  redemption suspended at times  (a) when the New York
Stock Exchange is  closed for other  than customary weekends  and holidays,  (b)
when  trading on that Exchange is restricted,  (c) when an emergency exists as a
result of which disposal by the Fund of securities owned by it is not reasonably
practicable or it is not reasonably practicable for the Fund fairly to determine
the value of its net assets, or (d) during any other period when the  Securities
and  Exchange Commission by order so permits; provided that applicable rules and
regulations of the Securities and Exchange Commission shall govern as to whether
the conditions prescribed in (b) or (c) exist. If the shares to be redeemed have
recently been  purchased  by check  (including  a certified  or  bank  cashier's
check),  payment  of redemption  proceeds may  be delayed  for the  minimum time
needed to verify that the check used  for investment has been honored (not  more
than  fifteen days  from the  time of  investment 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.
 
    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 contingent  deferred sales charge 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  contingent deferred  sales charge  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 thirty 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 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.
 
                                       35
<PAGE>
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 such undistributed gains in
determining their taxable income and  may claim their share  of the tax paid  by
the Fund as a credit against their individual federal income tax.
 
    Because  the Fund intends to distribute all of its net investment income and
capital gains to shareholders and otherwise  continue to qualify as a  regulated
investment  company under Subchapter M  of the Internal Revenue  Code, it is not
expected that  the  Fund  will  be  required to  pay  any  federal  income  tax.
Shareholders  will  normally have  to pay  federal income  taxes, and  any state
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 calendar
quarter of any year to shareholder of  record for that period which are paid  in
the  following calendar year prior to February  1 will be deemed received by the
shareholder in the prior calendar year.
 
    Gains or losses on  the sales of  securities by the  Fund will be  long-term
capital  gains or losses if  the securities have been held  by the Fund for more
than twelve months. Gains or  losses on the sale  of securities held for  twelve
months or less will be short-term 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.
 
    The  Fund  has qualified  and  intends to  remain  qualified as  a regulated
investment company under Subchapter M of the Internal Revenue Code of 1986  (the
"Code").  If so qualified, the Fund will not be subject to federal income tax on
its net investment  income and net  short-term capital gains,  if any,  realized
during  any fiscal year in which it distributes such income and capital gains to
its shareholders.
 
    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.
 
    Dividend  payments  will  be  eligible for  the  federal  dividends received
deduction available to the Fund's corporate shareholders only to the extent  the
aggregate  dividends received by the Fund would be eligible for the deduction if
the Fund were  the shareholder  claiming the dividends  received deduction.  The
amount  of  dividends paid  by  the Fund  which  may qualify  for  the dividends
received deduction is limited  to the aggregate  amount of qualifying  dividends
which the Fund derives from its portfolio investments which the Fund has held to
a  minimum period, usually 46 days. Any  distributions made by the Fund will not
be eligible for the  dividends received deduction with  respect to shares  which
are  held by  the shareholder for  45 days  or less. Any  long-term capital gain
distributions will also not  be eligible for  the dividends received  deduction.
The ability to take the dividends received deduction will also be limited in the
case  of  a Fund  shareholder which  incurs or  continues indebtedness  which is
directly attributable to its investment in the Fund.
 
                                       36
<PAGE>
    After the end  of the 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  the portion  eligible for  the dividends  received
deduction.  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. Yield
is calculated for any  30-day period as follows:  the amount of interest  and/or
dividend  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". The resulting amount
is divided by the product of  the net asset value per  share on the last day  of
the  period multiplied by  the average number of  Fund shares 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
September 30,  1996,  the  Fund's  yield, calculated  pursuant  to  the  formula
described above, was 4.99%.
    
 
   
    The  Fund's "average annual total return" represents an annualization of the
Fund's total return  over a  particular period and  is computed  by finding  the
annual  percentage rate which  will result in  the ending redeemable  value of a
hypothetical $1,000 investment made at the beginning of a one, five or ten  year
period,  or  for  the  period  from  the  date  of  commencement  of  the Fund's
operations, if shorter than any of the foregoing. The ending redeemable value is
reduced by any contingent deferred sales charge  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 return  of
the  Fund for the fiscal year ended September 30, 1996, for the five years ended
September 30, 1996 and  for the ten  years ended September  30, 1996 was  9.70%,
12.01% and 7.31%, respectively.
    
 
   
    In  addition to the foregoing, the Fund  may advertise its total return over
different periods of time by means of aggregate, average, year-by-year or  other
types  of total  return figures.  Such calculations may  or may  not reflect the
deduction of the  contingent deferred  sales charge 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 return of the Fund for the fiscal year ended  September
30,  1996, for  the five years  ended September 30,  1996 and for  the ten years
ended September 30, 1996 was 14.70%, 12.27% and 7.31%, respectively.
    
 
   
    In addition, the Fund may compute  its aggregate total return 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  contingent deferred  sales  charge) by  the  initial  $1,000
investment   and  subtracting  1  from  the   result.  Based  on  the  foregoing
calculation, the Fund's  total return for  the fiscal year  ended September  30,
1996,  for the five years  ended September 30, 1996 and  for the ten years ended
September 30, 1996 was 14.70%, 78.33% and 102.49%, respectively.
    
 
                                       37
<PAGE>
   
    The Fund  may  also advertise  the  growth of  hypothetical  investments  of
$10,000,  $50,000 and $100,000 in  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  extent of  any applicable  contingent  deferred sales  charge) and
multiplying by $10,000, $50,000 or $100,000, as the case may be. Investments  of
$10,000,  $50,000  or $100,000  in the  Fund  at inception  would have  grown to
$24,281, $121,405 and $242,810, respectively, at September 30, 1996.
    
 
    The Fund  may advertise,  from time  to time,  its performance  relative  to
certain performance rankings and indices compiled by independent organizations.
 
DESCRIPTION OF SHARES OF THE FUND
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, the shareholders of the Fund are entitled to
a  full vote  for each full  share held. The  Trustees have been  elected by the
shareholders of the  Fund, most recently  at a Special  Meeting of  Shareholders
held  on January 12, 1993. Messrs. Bozic,  Purcell and Schroeder were elected by
the other Trustees of the  Fund on April 8,  1994. 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, the Trustees may be removed by action of the
Trustees. The shareholders also have the right, under certain circumstances,  to
remove  the Trustees. The  voting rights of shareholders  are not cumulative, so
that holders of more than 50 percent  of the shares voting can, if they  choose,
elect  all Trustees  being selected, while  the holders of  the remaining shares
would be unable to elect any Trustees.
 
    The Declaration of Trust permits the  Trustees to authorize the creation  of
additional  series  of  shares  (the  proceeds of  which  would  be  invested in
separate, independently  managed portfolios)  and additional  classes of  shares
within  any  series (which  would be  used  to distinguish  among the  rights of
different categories of shareholders, as might be required by future regulations
or other unforeseen  circumstances). However, the  Trustees have not  authorized
any such additional series or classes of shares.
 
    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 a rise 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 Trust 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
 
                                       38
<PAGE>
Manager and 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; including  providing
subaccounting  and  recordkeeping  services  for  certain  retirement  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 September 30. 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.
 
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
    Sheldon  Curtis, 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 annual financial statements  of the Fund 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.
 
                                       39
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND TRUSTEES
OF DEAN WITTER CONVERTIBLE 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 Convertible Securities
Trust, (the "Fund") at September 30, 1996, the results of its operations for the
year then ended, the changes in its net assets for each of the two years in the
period then ended and the financial highlights for each of the ten years in the
period then ended, in conformity with generally accepted accounting principles.
These financial statements and financial highlights (hereafter referred to as
"financial statements") are the responsibility of the Fund's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these financial statements in accordance
with generally accepted auditing standards which require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits, which included confirmation of securities at
September 30, 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
NOVEMBER 8, 1996
 
- --------------------------------------------------------------------------------
                      1996 FEDERAL TAX NOTICE (UNAUDITED)
 
       During  the fiscal  year ended September  30, 1996,  21.74% of the
       income  dividends  qualified  for  dividends  received   deduction
       available to corporations.
 
                                       40
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             CORPORATE BONDS (59.4%)
             CONVERTIBLE BONDS (58.7%)
             AUTO PARTS (0.1%)
 $     190   Magna International, Inc. (Canada)..........      5.00  %    10/15/02  $       202,918
                                                                                    ---------------
             BANKING (0.2%)
       340   Banco de Galicia y Buenos Aires S.A.
             (Argentina).................................      7.00       08/01/02          335,288
       130   Bangkok Bank Public Co. (Hong Kong).........      3.25       03/03/04          144,300
                                                                                    ---------------
                                                                                            479,588
                                                                                    ---------------
             BIOTECHNOLOGY (0.9%)
     2,050   Nabi, Inc. - 144A**.........................      6.50       02/01/03        2,207,542
                                                                                    ---------------
             BROADCAST MEDIA (0.9%)
     4,000   Jacor Communications, Inc...................      0.00       06/12/11        2,010,000
                                                                                    ---------------
             BUILDING MATERIALS (0.1%)
       220   Cemex S.A. (Mexico).........................      4.25       11/01/97          211,475
                                                                                    ---------------
             CABLE/CELLULAR (3.7%)
       210   Comcast Corp................................      3.375      09/09/05          181,463
     4,130   Comcast Corp................................      1.125      04/15/07        1,890,797
     4,000   Tele-Communications International,
             Inc.........................................      4.50       02/15/06        3,210,000
    10,270   U.S. Celluar Corp...........................      0.00       06/15/15        3,414,775
                                                                                    ---------------
                                                                                          8,697,035
                                                                                    ---------------
             CHEMICALS (2.4%)
       125   Formosa Chem & Fibre Corp. (Taiwan).........      1.75       07/19/01          131,094
    12,500   RPM, Inc....................................      0.00       09/30/12        5,546,875
                                                                                    ---------------
                                                                                          5,677,969
                                                                                    ---------------
             COMPUTER SERVICES (0.1%)
       250   Automatic Data Processing, Inc..............      0.00       02/20/12          141,442
                                                                                    ---------------
             COMPUTER SOFTWARE (0.1%)
       295   Softkey International Inc. - 144A**.........      5.50       11/01/00          236,457
                                                                                    ---------------
             CONGLOMERATES (0.9%)
     1,500   Alfa S.A. de C.V. (Mexico)..................      8.00       09/15/00        1,605,000
       300   Alfa S.A. de C.V. (Mexico) - 144A**.........      8.00       09/15/00          321,000
       100   Renong Berhad (Malaysia) - 144A**...........      2.00       07/15/05          100,750
                                                                                    ---------------
                                                                                          2,026,750
                                                                                    ---------------
             CONSTRUCTION PLANT & EQUIPMENT (0.0%)
       125   Kumagai Gumi Finance (Hong Kong)............      4.875      12/08/98          115,781
                                                                                    ---------------
             CONSUMER PRODUCTS (0.1%)
       150   President Enterprises Corp. (Taiwan)........      0.00       07/22/01          233,250
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       41
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             DRUGS (1.4%)
 $   3,075   Bindley Western Industries, Inc.............      6.50  %    10/01/02  $     3,198,000
       240   Elan International Finance Ltd..............      0.00       10/16/12          155,954
                                                                                    ---------------
                                                                                          3,353,954
                                                                                    ---------------
             ELECTRONICS & ELECTRICAL (1.5%)
       120   Johnson Electric Holdings, Ltd. (Hong
             Kong).......................................      4.50       11/05/00          110,100
       850   Recognition Equipment Inc...................      7.25       04/15/11          791,350
     3,000   Richey Electronics Inc......................      7.00       03/01/06        2,702,670
                                                                                    ---------------
                                                                                          3,604,120
                                                                                    ---------------
             ELECTRONICS - SEMICONDUCTORS (0.1%)
        90   Integrated Device Technology................      5.50       06/01/02           71,787
       185   Xilinx Inc. - 144A**........................      5.25       11/01/02          176,486
                                                                                    ---------------
                                                                                            248,273
                                                                                    ---------------
             ENTERTAINMENT/GAMING (1.4%)
     1,353   Argosy Gaming Co............................     12.00       06/01/01        1,190,640
     2,050   Savoy Pictures Entertainment, Inc...........      7.00       07/01/03        1,476,000
       170   Technology Resources Industries Berhad
             (Malaysia)..................................      2.75       11/28/04          191,250
       500   WMS Industries, Inc.........................      5.75       11/30/02          525,045
                                                                                    ---------------
                                                                                          3,382,935
                                                                                    ---------------
             FINANCIAL SERVICES (0.9%)
     2,000   AT&T Latin American Equity - 144A**.........      0.00       03/30/99        1,750,000
       175   HSH Overseas Finance Ltd. (Cayman
             Islands)....................................      5.00       01/06/01          196,437
       200   Lend Lease Finance International Ltd.
             (Australia).................................      4.75       06/01/03          271,500
                                                                                    ---------------
                                                                                          2,217,937
                                                                                    ---------------
             FOODS (0.0%)
        80   Grand Metropolitan PLC (United Kingdom).....      6.50       01/31/00           92,700
                                                                                    ---------------
             FOREIGN GOVERNMENT (0.9%)
     2,000   Republic of Italy...........................      5.00       06/28/01        2,017,500
                                                                                    ---------------
             HEALTHCARE (8.6%)
     2,500   ARV Assisted Living, Inc. - 144A**..........      6.75       04/01/06        2,462,475
     3,450   Beverly Enterprises, Inc....................      5.50       08/01/18        3,297,613
       200   Integrated Health Services, Inc.............      5.75       01/01/01          200,478
     2,000   Integrated Health Services, Inc.............      6.00       01/01/03        1,979,680
        90   Multicare Companies, Inc....................      7.00       03/15/03          119,925
     3,155   Quantum Health Resources Inc................      4.75       10/01/00        2,918,375
     2,000   Rotech Medical Corp. - 144A**...............      5.25       06/01/03        1,725,000
     3,000   Tenet Healthcare Corp.......................      6.00       12/01/05        3,180,060
     4,000   Vivra, Inc. - 144A**........................      5.00       07/01/01        4,245,400
                                                                                    ---------------
                                                                                         20,129,006
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       42
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             HEALTHCARE - MISCELLANEOUS (1.2%)
 $   3,800   Pharmaceutical Marketing Services, Inc......      6.25  %    02/01/03  $     2,843,502
                                                                                    ---------------
             HOME BUILDING (1.1%)
     3,015   U.S. Home Corp..............................      4.875      11/01/05        2,460,994
                                                                                    ---------------
             HOTELS/MOTELS (1.8%)
     1,000   Pailburg International Finance (Hong
             Kong).......................................      3.50       02/06/01        1,002,500
       225   Shangri-La Asia Capital (Hong Kong).........      2.875      12/16/00          188,156
     3,400   Sholodge Inc................................      7.50       05/01/04        3,076,966
                                                                                    ---------------
                                                                                          4,267,622
                                                                                    ---------------
             INDUSTRIALS (1.4%)
       120   Banpu PCL (Thailand)........................      3.50       08/25/04          144,000
       100   Sampo Corp. (Taiwan)........................      2.625      11/23/01          114,375
     2,575   Trimas Corp.................................      5.00       08/01/03        2,833,890
       100   YTL Corp. Berhad (Malaysia) - 144A**........      0.00       08/15/02          139,500
                                                                                    ---------------
                                                                                          3,231,765
                                                                                    ---------------
             INSURANCE (1.7%)
        75   Aegon NV (Netherlands) - 144A**.............      4.75       11/01/04          132,750
     3,000   CII Financial, Inc..........................      7.50       09/15/01        2,712,750
     1,000   Pioneer FinanciaI Services, Inc.............      6.50       04/01/03        1,027,700
       200   USF&G Corp..................................      0.00       03/03/09          126,750
                                                                                    ---------------
                                                                                          3,999,950
                                                                                    ---------------
             LEISURE (2.6%)
    20,995   Coleman Worldwide Corp......................      0.00       05/27/13        6,036,062
                                                                                    ---------------
             MACHINERY (1.3%)
     1,500   Cooper Industries, Inc......................      7.05       01/01/15        1,645,980
     1,500   Robbins & Meyers, Inc.......................      6.50       09/01/03        1,524,375
                                                                                    ---------------
                                                                                          3,170,355
                                                                                    ---------------
             MEDIA GROUP (2.7%)
     2,055   All American Communications Inc.............      6.50       10/01/03        2,013,900
       395   News America Holdings, Inc..................      0.00       03/11/13          177,750
     4,065   Scandinavian Broadcasting (Luxembourg)......      7.25       08/01/05        4,075,162
                                                                                    ---------------
                                                                                          6,266,812
                                                                                    ---------------
             MEDICAL PRODUCTS & SUPPLIES (0.2%)
       500   Phoenix Shannon PLC - 144A**................      9.50       11/01/00          385,625
                                                                                    ---------------
             METALS (0.4%)
     1,250   Crown Resources Corp........................      5.75       08/27/01        1,000,000
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       43
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             OFFICE EQUIPMENT & SUPPLIES (1.8%)
 $   1,000   U.S. Office Products Co.....................      5.50  %    05/15/03  $       948,750
     3,500   U.S. Office Products Co. - 144A**...........      5.50       05/15/03        3,290,000
                                                                                    ---------------
                                                                                          4,238,750
                                                                                    ---------------
             OIL & GAS (0.1%)
       145   Apache Corp.................................      6.00       01/15/02          164,213
                                                                                    ---------------
             PAPER & FOREST PRODUCTS (0.2%)
        70   PT International Indorayon Utama
             (Indonesia).................................      5.50       10/01/02           80,745
       120   Riverwood International Corp................      6.75       09/15/03          138,300
       350   Sappi BVI Finance Ltd. (South Africa) -
             144A**......................................      7.50       08/01/02          322,875
                                                                                    ---------------
                                                                                            541,920
                                                                                    ---------------
             POLLUTION CONTROL (0.1%)
        85   Laidlaw Inc. (Canada) - 144A**..............      6.00       01/15/99          110,118
       213   WMX Technologies, Inc.......................      2.00       01/24/05          197,157
                                                                                    ---------------
                                                                                            307,275
                                                                                    ---------------
             PUBLISHING (2.3%)
    10,000   Hollinger, Inc. (Canada)....................      0.00       10/05/13        3,337,500
        45   Nelson (Thomas), Inc. - 144A**..............      5.75       11/30/99           42,165
        90   Scholastic Corp. - 144A**...................      5.00       08/15/05          101,186
     5,000   Time Warner, Inc............................      0.00       12/17/12        1,839,250
                                                                                    ---------------
                                                                                          5,320,101
                                                                                    ---------------
             REAL ESTATE (0.3%)
        80   Guangzhou Investment Co. (Hong Kong)........      4.50       10/08/98           84,600
       200   HD Finance Cayman Ltd. (Cayman Islands) -
             144A**......................................      6.75       06/01/00          229,500
       290   New World Development (Hong Kong)...........      4.375      12/11/00          330,238
                                                                                    ---------------
                                                                                            644,338
                                                                                    ---------------
             REAL ESTATE INVESTMENT TRUST (4.2%)
     2,850   Alexander Haagen Properties, Inc. (Series
             A)..........................................      7.50       01/15/01        2,597,063
     1,850   Camden Property Trust.......................      7.33       04/01/01        1,868,500
        40   Liberty Property Trust......................      8.00       07/01/01           43,500
     2,750   Mid Atlantic Realty Trust...................      7.625      09/15/03        2,586,293
     2,720   Pacific Gulf Properties Inc.................      8.375      02/15/01        2,720,000
                                                                                    ---------------
                                                                                          9,815,356
                                                                                    ---------------
             RESTAURANTS (1.2%)
     3,375   TPI Enterprises, Inc........................      8.25       07/15/02        2,868,750
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       44
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             RETAIL (4.9%)
 $   2,000   Charming Shoppes, Inc.......................      7.50  %    07/15/06  $     2,189,340
       100   Federated Department Stores, Inc............      5.00       10/01/03          111,688
     1,750   Home Depot, Inc.............................      3.25       10/01/01        1,778,438
     3,700   Men's Wearhouse, Inc. (The).................      5.25       03/01/03        3,552,000
     3,145   Office Depot, Inc...........................      0.00       11/01/08        1,914,456
        75   Pep Boys-Manny, Moe & Jack..................      4.00       09/01/99           78,265
     2,000   Sports & Recreation Inc.....................      4.25       11/01/00        1,500,000
       275   Staples, Inc. - 144A**......................      4.50       10/01/00          315,098
                                                                                    ---------------
                                                                                         11,439,285
                                                                                    ---------------
             STEEL (2.2%)
     1,275   Nippon Denro Ltd. (India) - 144A**..........      3.00       04/01/01          605,625
     3,900   Quanex Corp.................................      6.88       06/30/07        3,948,750
       700   Sahaviriya Steel Industries (Thailand) -
             144A**......................................      3.50       07/26/05          497,000
                                                                                    ---------------
                                                                                          5,051,375
                                                                                    ---------------
             TECHNOLOGY (1.3%)
       130   EMC Corp....................................      4.25       01/01/01          155,401
     2,000   Park Electrochemical Corp...................      5.50       03/01/06        1,642,500
       150   Storage Technology Corp.....................      8.00       05/31/15          176,250
       135   Unisys Corp.................................      8.25       08/01/00          125,550
       750   Unisys Corp.................................      8.25       03/15/06          836,250
                                                                                    ---------------
                                                                                          2,935,951
                                                                                    ---------------
             TELECOMMUNICATIONS (0.8%)
       137   General Instrument Corp.....................      5.00       06/15/00          150,096
     1,750   SA Telecommunications Inc. - 144A**.........     10.00       08/15/06        1,837,500
                                                                                    ---------------
                                                                                          1,987,596
                                                                                    ---------------
             TEXTILES (0.1%)
       200   Far Eastern Textile (Taiwan)................      4.00       10/07/06          236,750
                                                                                    ---------------
             TRANSPORTATION - INTERNATIONAL (0.5%)
     1,651   Consorcio G Grupo Dina S.A. de C.V.
             (Mexico)....................................      8.00       08/08/04        1,122,680
                                                                                    ---------------
 
             TOTAL CONVERTIBLE BONDS
             (IDENTIFIED COST $138,135,816).......................................      137,623,659
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       45
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             NON-CONVERTIBLE BONDS (0.7%)
             OIL & GAS (0.1%)
 $      70   SFP Pipeline Holdings, Inc..................     11.16  %    08/15/10  $        85,400
                                                                                    ---------------
             RESTAURANTS (0.6%)
     2,500   Flagstar Corp...............................     11.375      09/15/03        1,512,500
                                                                                    ---------------
 
             TOTAL NON-CONVERTIBLE BONDS
             (IDENTIFIED COST $2,541,700).........................................        1,597,900
                                                                                    ---------------
 
             TOTAL CORPORATE BONDS
             (IDENTIFIED COST $140,677,516).......................................      139,221,559
                                                                                    ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                                                    VALUE
- ------------------------------------------------------------------------------------------------------
<C>          <S>                                                                       <C>
             CONVERTIBLE PREFERRED STOCKS (18.5%)
             AUTO PARTS (0.4%)
     1,300   Federal Mogul Corp. (Series D) $3.875 - 144A**..........................           79,300
    66,600   Mascotech, Inc. $1.20...................................................          949,050
                                                                                       ---------------
                                                                                             1,028,350
                                                                                       ---------------
             BANKS (0.8%)
    40,000   BCP International Bank, Ltd. (Series A) (Portugal) $4.00................        1,985,000
                                                                                       ---------------
             BIOTECHNOLOGY (0.4%)
    63,500   Gensia, Inc. $3.75 - 144A**.............................................        1,016,000
                                                                                       ---------------
             CABLE/CELLULAR (0.5%)
    30,000   TCI Communications, Inc. (Series A) $2.125..............................        1,196,250
                                                                                       ---------------
             CHEMICALS (0.1%)
     1,700   Occidental Petroleum Corp. $3.875 - 144A**..............................           96,475
     3,300   Occidental Petroleum Corp. (Series A) $3.00.............................          193,875
                                                                                       ---------------
                                                                                               290,350
                                                                                       ---------------
             FINANCIAL SERVICES (0.1%)
     1,700   Advanta Corp. $2.50.....................................................           72,250
     2,000   Merrill Lynch & Co., Inc. $3.12.........................................          122,000
                                                                                       ---------------
                                                                                               194,250
                                                                                       ---------------
             FOODS (0.5%)
    30,000   Chiquita Brands International, Inc. (Series A) $2.875...................        1,271,250
                                                                                       ---------------
             INSURANCE (2.0%)
    40,000   American Bankers Insurance Group, Inc. (Series B) $3.125................        2,360,000
    40,000   PennCorp Financial Group, Inc. $3.50 - 144A**...........................        2,280,000
                                                                                       ---------------
                                                                                             4,640,000
                                                                                       ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       46
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                                                    VALUE
- ------------------------------------------------------------------------------------------------------
<C>          <S>                                                                       <C>
             MEDIA GROUP (1.0%)
   240,000   Triathlon Broadcasting Co. $0.95........................................  $     2,460,000
                                                                                       ---------------
             OIL & GAS (3.0%)
   120,000   Callon Petroleum Co. (Series A) $2.125..................................        4,080,000
    40,000   ENRON Corp. $1.36.......................................................          950,000
    30,000   NorAm Financing I $3.125................................................        1,841,250
                                                                                       ---------------
                                                                                             6,871,250
                                                                                       ---------------
             PAPER & FOREST PRODUCTS (0.1%)
     2,200   International Paper Capital Trust $2.625 - 144A**.......................          105,325
                                                                                       ---------------
             POLLUTION CONTROL (0.1%)
     4,000   Browning-Ferris Industries, Inc. $2.58..................................          114,000
                                                                                       ---------------
             PUBLISHING (1.5%)
    27,000   Golden Books Financing Trust $4.375 - 144A**............................        1,520,451
   165,000   Hollinger International, Inc. $0.951....................................        1,835,625
     1,400   Houghton Mifflin Co. $4.08..............................................          135,800
                                                                                       ---------------
                                                                                             3,491,876
                                                                                       ---------------
             REAL ESTATE (0.8%)
    35,000   Catellus Development Corp. (Series B) $3.625 - 144A**...................        1,903,125
                                                                                       ---------------
             REAL ESTATE INVESTMENT TRUST (1.7%)
   151,100   FelCor Suite Hotels, Inc. (Series A) $1.95..............................        3,928,600
                                                                                       ---------------
             STEEL (1.7%)
    45,000   WHX Corp. (Series A) $3.25..............................................        1,873,125
    49,000   WHX Corp. (Series B) $3.75..............................................        2,002,875
                                                                                       ---------------
                                                                                             3,876,000
                                                                                       ---------------
             TELECOMMUNICATIONS (2.2%)
    70,000   General Datacomm Industries, Inc. $2.25 - 144A**........................        1,754,410
    48,000   Globalstar Telecommunications $3.25 - 144A**............................        2,280,000
    35,000   Sprint Corp. $2.63......................................................        1,225,000
                                                                                       ---------------
                                                                                             5,259,410
                                                                                       ---------------
             TOYS (1.5%)
   575,500   Tyco Toys, Inc. (Series C) $0.413.......................................        3,596,875
                                                                                       ---------------
             WHOLESALE DISTRIBUTOR (0.1%)
     1,300   Alco Standard Corp. $5.04...............................................          118,300
                                                                                       ---------------
 
             TOTAL CONVERTIBLE PREFERRED STOCKS
             (IDENTIFIED COST $39,390,610)...........................................       43,346,211
                                                                                       ---------------
 
             COMMON STOCKS (7.3%)
             AIR TRANSPORT (0.1%)
     2,345   Delta Air Lines, Inc....................................................          168,840
                                                                                       ---------------
             AUTO PARTS (0.5%)
    79,200   Mascotech, Inc..........................................................        1,128,600
                                                                                       ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       47
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                                                    VALUE
- ------------------------------------------------------------------------------------------------------
<C>          <S>                                                                       <C>
             CABLE/CELLULAR (0.2%)
    40,000   Centennial Cellular Corp................................................  $       530,000
                                                                                       ---------------
             DRUGS (0.1%)
    20,000   Bindley Western Industries, Inc.........................................          350,000
                                                                                       ---------------
             ENTERTAINMENT/GAMING (1.4%)
   861,328   Alliance Gaming Corp....................................................        3,229,980
                                                                                       ---------------
             HEALTHCARE (0.5%)
    50,000   Integrated Health Services, Inc.........................................        1,262,500
                                                                                       ---------------
             MANUFACTURING (0.1%)
     4,982   Fisher Scientific International, Inc....................................          205,508
                                                                                       ---------------
             MEDICAL PRODUCTS & SUPPLIES (0.5%)
    60,000   Neuromedical Systems, Inc.*.............................................        1,117,500
                                                                                       ---------------
             POLLUTION CONTROL (0.4%)
   122,000   OHM Corp.*..............................................................          960,750
                                                                                       ---------------
             REAL ESTATE INVESTMENT TRUST (1.7%)
    75,000   American General Hospitality Corp.......................................        1,425,000
    48,100   Avalon Properties, Inc..................................................        1,118,325
    30,000   Cali Realty Corp........................................................          813,750
    16,400   Urban Shopping Centers, Inc.............................................          399,750
                                                                                       ---------------
                                                                                             3,756,825
                                                                                       ---------------
             RESTAURANTS (0.7%)
   100,000   Brinker International, Inc.*............................................        1,700,000
                                                                                       ---------------
             RETAIL (0.2%)
    35,000   Michaels Stores, Inc.*..................................................          507,500
                                                                                       ---------------
             TELECOMMUNICATIONS (0.6%)
    30,000   BCE, Inc. (Canada)......................................................        1,282,500
     6,231   General Instrument Corp.*...............................................          154,217
                                                                                       ---------------
                                                                                             1,436,717
                                                                                       ---------------
             TRANSPORTATION (0.3%)
    40,000   Team Rental Group, Inc.*................................................          730,000
                                                                                       ---------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $16,332,011)...........................................       17,084,720
                                                                                       ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF                                                              EXPIRATION
 WARRANTS                                                                  DATE           VALUE
- ----------------------------------------------------------------------------------------------------
<C>          <S>                                                        <C>          <C>
             WARRANT (0.0%)
             TELECOMMUNICATIONS
    45,000   Audiovox Corp.* - 144A** (Identified Cost $0)............     03/15/01           56,250
                                                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       48
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             SHORT-TERM INVESTMENTS (10.5%)
             COMMERCIAL PAPER (a) (5.5%)
             AUTOMOTIVE - FINANCE (1.7%)
 $   3,900   Ford Motor Credit Co........................      5.31  %  10/03/96..  $     3,898,849
                                                                                    ---------------
             CHEMICALS (1.7%)
     4,000   Du Pont (E.I.) de Nemours & Co., Inc........      5.388    10/04/96..        3,998,207
                                                                                    ---------------
             ENTERTAINMENT (2.1%)
     5,000   Walt Disney Co..............................      5.05     10/01/96..        5,000,000
                                                                                    ---------------
 
             TOTAL COMMERCIAL PAPER
             (AMORTIZED COST $12,897,056).........................................       12,897,056
                                                                                    ---------------
 
             REPURCHASE AGREEMENT (5.0%)
    11,682   The Bank of New York (dated 09/30/96;
             proceeds $11,684,007; collateralized by
             $11,670,451 U.S. Treasury Note 5.625% due
             10/31/97 valued at $11,916,032) (Identified
             Cost $11,682,384)...........................      5.00     10/01/96..       11,682,384
                                                                                    ---------------
 
             TOTAL SHORT-TERM INVESTMENTS
             (IDENTIFIED COST $24,579,440)........................................       24,579,440
                                                                                    ---------------
 
TOTAL INVESTMENTS
(IDENTIFIED COST $220,979,577) (B)...........       95.7%   224,288,180
 
CASH AND OTHER ASSETS IN EXCESS OF
LIABILITIES..................................        4.3     10,046,026
                                                   -----   ------------
 
NET ASSETS...................................      100.0%  $234,334,206
                                                   -----   ------------
                                                   -----   ------------
 
<FN>
- ---------------------
 *   Non-income producing security.
**   Resale is restricted to qualified institutional investors.
(a)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation was $11,991,694 and the
     aggregate gross unrealized depreciation was $8,683,091, resulting in net
     unrealized appreciation of $3,308,603.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       49
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
SEPTEMBER 30, 1996
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $220,979,577)............................  $ 224,288,180
Cash........................................................      9,812,251
Receivable for:
    Interest................................................      1,823,016
    Investments sold........................................        641,875
    Shares of beneficial interest sold......................        468,023
    Dividends...............................................        295,102
Prepaid expenses............................................         39,148
                                                              -------------
 
     TOTAL ASSETS...........................................    237,367,595
                                                              -------------
 
LIABILITIES:
Payable for:
    Investments purchased...................................      1,750,000
    Shares of beneficial interest repurchased...............        727,233
    Plan of distribution fee................................        190,520
    Investment management fee...............................        114,312
    Dividends to shareholders...............................        107,695
Accrued expenses............................................        143,629
                                                              -------------
 
     TOTAL LIABILITIES......................................      3,033,389
                                                              -------------
 
NET ASSETS:
Paid-in-capital.............................................    582,151,590
Net unrealized appreciation.................................      3,308,603
Accumulated undistributed net investment income.............      4,914,784
Accumulated net realized loss...............................   (356,040,771)
                                                              -------------
 
     NET ASSETS.............................................  $ 234,334,206
                                                              -------------
                                                              -------------
 
NET ASSET VALUE PER SHARE,
  18,422,346 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED
  OF $.01 PAR VALUE)........................................
                                                                     $12.72
                                                              -------------
                                                              -------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       50
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED SEPTEMBER 30, 1996
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
 
INCOME
Interest....................................................  $10,804,205
Dividends (net of $8,958 foreign withholding tax)...........    2,916,746
                                                              -----------
 
     TOTAL INCOME...........................................   13,720,951
                                                              -----------
 
EXPENSES
Plan of distribution fee....................................    2,057,104
Investment management fee...................................    1,234,262
Transfer agent fees and expenses............................      373,604
Professional fees...........................................       81,464
Shareholder reports and notices.............................       53,986
Custodian fees..............................................       27,197
Registration fees...........................................       24,311
Trustees' fees and expenses.................................       16,451
Other.......................................................       18,564
                                                              -----------
 
     TOTAL EXPENSES.........................................    3,886,943
                                                              -----------
 
     NET INVESTMENT INCOME..................................    9,834,008
                                                              -----------
 
NET REALIZED AND UNREALIZED GAIN:
Net realized gain...........................................   13,199,408
Net change in unrealized appreciation.......................    5,765,842
                                                              -----------
 
     NET GAIN...............................................   18,965,250
                                                              -----------
 
NET INCREASE................................................  $28,799,258
                                                              -----------
                                                              -----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       51
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                              FOR THE YEAR ENDED   FOR THE YEAR ENDED
                                                              SEPTEMBER 30, 1996   SEPTEMBER 30, 1995
- -----------------------------------------------------------------------------------------------------
<S>                                                           <C>                  <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income.......................................     $  9,834,008         $  9,380,335
Net realized gain...........................................       13,199,408           10,976,243
Net change in unrealized appreciation.......................        5,765,842            2,262,729
                                                              ------------------   ------------------
 
     NET INCREASE...........................................       28,799,258           22,619,307
 
Dividends from net investment income........................      (10,327,902)          (8,166,179)
Net increase (decrease) from transactions in shares of
  beneficial interest.......................................       30,464,485          (19,449,807)
                                                              ------------------   ------------------
 
     TOTAL INCREASE (DECREASE)..............................       48,935,841           (4,996,679)
 
NET ASSETS:
Beginning of period.........................................      185,398,365          190,395,044
                                                              ------------------   ------------------
 
     END OF PERIOD
    (INCLUDING UNDISTRIBUTED NET INVESTMENT INCOME OF
    $4,914,784 AND $5,408,228, RESPECTIVELY)................     $234,334,206         $185,398,365
                                                              ------------------   ------------------
                                                              ------------------   ------------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       52
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1996
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter Convertible 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
seek a high level of total return on its assets through a combination of current
income and capital appreciation. The Fund was organized as a Massachusetts
business trust on May 21, 1985 and commenced operations on October 31, 1985.
 
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) an equity security listed or traded on the
New York or American Stock Exchange or other domestic or foreign exchange is
valued at its latest sale price on that exchange prior to the time when assets
are valued; if there were no sales that day, the security is valued at the
latest bid price (in cases where a security is traded on more than one exchange,
the security is valued on the exchange designated as the primary market by the
Trustees); (2) all other 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; (3) when market quotations are not readily
available, including circumstances under which it is determined by the
Investment Manager that sale and 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; (4) certain portfolio securities may be valued by an outside
pricing service approved by the Trustees. The pricing service utilizes a matrix
system incorporating security quality, maturity and coupon as the evaluation
model parameters, and/or research and evaluations by its staff, including review
of broker-dealer market price quotations, if available, in determining what it
believes is the fair valuation of the portfolio securities valued by such
pricing service; and (5) short-term debt securities having a maturity date of
more than sixty days at time of purchase are valued on a mark-to-market basis
until sixty days prior to maturity and thereafter at amortized cost based on
their value on the 61st day. Short-term 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. Dividend
income is recorded on the ex-dividend date. Interest income is accrued daily.
 
                                       53
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1996, CONTINUED
 
C. FEDERAL INCOME TAX STATUS -- It is the Fund's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable income to its shareholders.
Accordingly, no federal income tax provision is required.
 
D. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends and
distributions to its shareholders on the record date. The amount of dividends
and distributions from net investment income and net realized capital gains are
determined in accordance with federal income tax regulations which may differ
from generally accepted accounting principles. These "book/tax" differences are
either considered temporary or permanent in nature. To the extent these
differences are permanent in nature, such amounts are reclassified within the
capital accounts based on their federal tax-basis treatment; temporary
differences do not require reclassification. Dividends and distributions which
exceed net investment income and net realized capital gains for financial
reporting purposes but not for tax purposes are reported as dividends in excess
of net investment income or distributions in excess of net realized capital
gains. To the extent they exceed net investment income and net realized capital
gains for tax purposes, they are reported as distributions of paid-in-capital.
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an Investment Management Agreement with 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 as of the close of each
business day: 0.60% to the portion of daily net assets not exceeding $750
million; 0.55% to the portion of daily net assets exceeding $750 million but not
exceeding $1 billion; 0.50% to the portion of daily net assets exceeding $1
billion but not exceeding $1.5 billion; 0.475% to the portion of daily net
assets exceeding $1.5 billion but not exceeding $2 billion; 0.45% to the portion
of daily net assets exceeding $2 billion but not exceeding $3 billion; and
0.425% to the portion of daily net assets exceeding $3 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.
 
                                       54
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 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 1.0% 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 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
$71,800,910 at September 30, 1996. Of this amount, $1,471,908 represents excess
distribution expenses of TCW/DW Global Convertible Trust, the net assets of
which were combined with those of the Fund on December 22, 1995 pursuant to an
Agreement and Plan of Reorganization.
 
                                       55
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1996, CONTINUED
 
The Distributor has informed the Fund that for the year ended September 30,
1996, it received approximately $145,000 in contingent deferred sales charges
from certain redemptions of the Fund's shares. The Fund's shareholders pay such
charges which are not an expense of the Fund.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The cost of purchases and proceeds from sales of portfolio securities, excluding
short-term investments, for the year ended September 30, 1996 aggregated
$309,357,627 and $305,835,298, respectively.
 
For the same period, the Fund incurred brokerage commissions of $11,922 with DWR
for portfolio transactions executed on behalf of the Fund.
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At September 30, 1996, the Fund had
transfer agent fees and expenses payable of approximately $30,000.
 
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 September 30, 1996
included in Trustees' fees and expenses in the Statement of Operations amounted
to $1,286. At September 30, 1996, the Fund had an accrued pension liability of
$49,151 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
                                                                        SEPTEMBER 30, 1996            SEPTEMBER 30, 1995
                                                                   ----------------------------   --------------------------
                                                                     SHARES          AMOUNT         SHARES         AMOUNT
                                                                   -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Sold.............................................................    6,348,274   $   78,466,531     2,692,941   $ 29,337,865
Reinvestment of dividends........................................      715,417        8,632,934       648,602      6,920,932
Shares issued in connection with the acquisition of TCW/DW Global
 Convertible Trust (Note 6)......................................    1,665,682       19,179,898       --             --
                                                                   -----------   --------------   -----------   ------------
                                                                     8,729,373      106,279,363     3,341,543     36,258,797
Repurchased......................................................   (6,193,018)     (75,814,878)   (5,171,631)   (55,708,604)
                                                                   -----------   --------------   -----------   ------------
Net increase (decrease)..........................................    2,536,355   $   30,464,485    (1,830,088)  $(19,449,807)
                                                                   -----------   --------------   -----------   ------------
                                                                   -----------   --------------   -----------   ------------
</TABLE>
 
                                       56
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
NOTES TO FINANCIAL STATEMENTS SEPTEMBER 30, 1996, CONTINUED
 
6. ACQUISITION OF TCW/DW GLOBAL CONVERTIBLE TRUST
 
As of the close of business on December 22, 1995, the Fund acquired all the net
assets of TCW/DW Global Convertible Trust ("Global Convertible") pursuant to a
plan of reorganization approved by the shareholders of Global Convertible on
December 19, 1995. The acquisition was accomplished by a tax-free exchange of
1,665,682 shares of the Fund at a net asset value of $11.52 for 1,811,960 shares
of Global Convertible. The net assets of the Fund and Global Convertible
immediately before the acquisition were $181,407,832 and $19,179,898,
respectively, including unrealized depreciation of $1,047,150 and distributions
in excess of net realized gains of $4,600. Immediately after the acquisition,
the combined net assets of the Fund amounted to $200,587,730.
 
7. FEDERAL INCOME TAX STATUS
 
During the year ended September 30, 1996, the Fund utilized approximately
$15,672,000 of its net capital loss carryover. At September 30, 1996, the Fund
had a net capital loss carryover of approximately $352,695,000 to offset future
capital gains to the extent provided by regulations through September 30 of the
following years:
 
<TABLE>
<CAPTION>
            AMOUNTS IN THOUSANDS
- ---------------------------------------------
  1997     1998     1999     2000     TOTAL
- --------  -------  -------  -------  --------
<S>       <C>      <C>      <C>      <C>
$207,480  $36,349  $46,135  $62,731  $352,695
- --------  -------  -------  -------  --------
- --------  -------  -------  -------  --------
</TABLE>
 
Capital losses incurred after October 31 ("post-October" losses) within the
taxable year are deemed to arise on the first business day of the Fund's next
taxable year. The Fund incurred and will elect to defer net capital losses of
approximately $2,373,000 during fiscal 1996.
 
As of September 30, 1996, the Fund had temporary book/tax differences primarily
attributable to post-October losses and capital loss deferrals on wash sales.
 
                                       57
<PAGE>
DEAN WITTER CONVERTIBLE SECURITIES TRUST
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED SEPTEMBER 30
                                ---------------------------------------------------------------------------------------
                                 1996     1995     1994     1993     1992     1991     1990     1989     1988     1987
- -----------------------------------------------------------------------------------------------------------------------
 
<S>                             <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>
PER SHARE OPERATING
PERFORMANCE:
 
Net asset value, beginning of
 period.......................  $11.67   $10.75   $10.62   $8.92    $8.67    $7.65    $9.68    $8.63    $12.42   $11.22
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
 
Net investment income.........   0.55     0.60     0.42     0.37     0.34     0.37     0.46     0.48     0.38     0.48
Net realized and unrealized
 gain (loss)..................   1.12     0.82     0.11     1.67     0.15     1.05    (2.06)    1.20    (2.87)    1.59
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
 
Total from investment
 operations...................   1.67     1.42     0.53     2.04     0.49     1.42    (1.60)    1.68    (2.49)    2.07
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
 
Less dividends and
 distributions from:
  Net investment income.......  (0.62)   (0.50)   (0.40)   (0.34)   (0.24)   (0.40)   (0.43)   (0.63)   (0.23)   (0.46)
  Net realized gain...........   --       --       --       --       --       --       --       --      (1.07)   (0.41)
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
 
Total dividends and
 distributions................  (0.62)   (0.50)   (0.40)   (0.34)   (0.24)   (0.40)   (0.43)   (0.63)   (1.30)   (0.87)
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
 
Net asset value, end of
 period.......................  $12.72   $11.67   $10.75   $10.62   $8.92    $8.67    $7.65    $9.68    $8.63    $12.42
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
                                ------   ------   ------   ------   ------   ------   ------   ------   ------   ------
 
TOTAL INVESTMENT RETURN+......  14.70 %  13.68 %   5.02 %  23.22 %   5.69 %  18.93 %  (16.93)% 20.20 %  (19.79)% 19.21 %
 
RATIOS TO AVERAGE NET ASSETS:
Expenses......................   1.89 %   1.96 %   1.93 %   1.93 %   1.92 %   1.92 %   1.88 %   1.76 %   1.79 %   1.62 %
 
Net investment income.........   4.78 %   5.24 %   3.68 %   3.44 %   3.43 %   4.34 %   4.96 %   4.93 %   3.87 %   3.85 %
 
SUPPLEMENTAL DATA:
Net assets, end of period, in
 millions.....................   $234     $185     $190     $208     $218     $297     $413     $822    $1,073   $2,029
 
Portfolio turnover rate.......    171 %    138 %    184 %    221 %    145 %    133 %     92 %    167 %    472 %    572 %
 
Average commission rate
 paid.........................  $0.0581   --       --       --       --       --       --       --       --       --
<FN>
 
- ---------------------
+    Does not reflect the deduction of sales charge. Calculated based on the net
     asset value as of the last business day of the period.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       58
<PAGE>

                    DEAN WITTER CONVERTIBLE SECURITIES TRUST

                            PART C  OTHER INFORMATION

Item 24.  Financial Statements and Exhibits

     (a)  FINANCIAL STATEMENTS 

          (1)  Financial statements and schedules, included in Prospectus
               (Part A):

                                                            Page in
                                                            -------
                                                           Prospectus
                                                           ----------
          Financial highlights for the fiscal years ended
          September 30, 1987, 1988, 1989, 1990, 1991,
          1992, 1993, 1994, 1995 and 1996 .................      4
                                
          
          (2)  Financial statements included in the Statement of Additional
               Information (Part B):
                                                             Page in
                                                             -------
                                                               SAI
                                                               --- 

          Portfolio of Investments at September 30, 1996...     41

          Statement of assets and liabilities at
          September 30, 1996...............................     50

          Statement of operations for the year ended
          September 30, 1996...............................     51

          Statement of changes in net assets for the years
          ended September 30, 1995 and
          September 30, 1996...............................     52

          Notes to Financial Statements....................     53


          (3)  Financial statements included in Part C:

          None

     (b)  EXHIBITS:

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

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

11.  --        Consent of Independent Accountants

16.  --        Schedule for Computation of Performance Quotations


                                        1

<PAGE>

27.  --        Financial Data Schedule


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 October 31, 1996  
     --------------                  ------------------------

Shares of Beneficial Interest                 26,569


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 


                                        2

<PAGE>

is, therefore, unenforceable.  In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a trustee, officer, or controlling person of the Registrant
in connection with the successful defense of any action, suit or proceeding) is
asserted against the Registrant by such trustee, officer or controlling person
in connection with the shares being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act, and will
be governed by the final adjudication of such issue.

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

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


                                        3

<PAGE>

Item 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.

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

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

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

OPEN-END INVESTMENT COMPANIES:
 (1) Dean Witter Short-Term Bond Fund
 (2) Dean Witter Tax-Exempt Securities Trust
 (3) Dean Witter Tax-Free Daily Income Trust
 (4) Dean Witter Dividend Growth Securities Inc.
 (5) Dean Witter Convertible Securities Trust
 (6) Dean Witter Liquid Asset Fund Inc.
 (7) Dean Witter Developing Growth Securities Trust
 (8) Dean Witter Retirement Series
 (9) Dean Witter Federal Securities Trust
(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.


                                        4

<PAGE>

(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 American Value Fund
(20) Dean Witter Strategist Fund
(21) Dean Witter Utilities Fund
(22) Dean Witter World Wide Income Trust
(23) Dean Witter New York Municipal Money Market Trust
(24) Dean Witter Capital Growth Securities
(25) Dean Witter Precious Metals and Minerals Trust
(26) Dean Witter European Growth Fund Inc.
(27) Dean Witter Global Short-Term Income Fund Inc.
(28) Dean Witter Pacific Growth Fund Inc.
(29) Dean Witter Multi-State Municipal Series Trust
(30) Dean Witter Premier Income Trust
(31) Dean Witter Short-Term U.S. Treasury Trust
(32) Dean Witter Diversified Income Trust
(33) Dean Witter U.S. Government Money Market Trust
(34) Dean Witter Global Dividend Growth Securities
(35) Active Assets California Tax-Free Trust
(36) Dean Witter Natural Resource Development Securities Inc.
(37) Active Assets Government Securities Trust
(38) Active Assets Money Trust
(39) Active Assets Tax-Free Trust
(40) Dean Witter Limited Term Municipal Trust
(41) Dean Witter Variable Investment Series
(42) Dean Witter Value-Added Market Series
(43) Dean Witter Global Utilities Fund
(44) Dean Witter High Income Securities
(45) Dean Witter National Municipal Trust
(46) Dean Witter International SmallCap Fund
(47) Dean Witter Mid-Cap Growth Fund
(48) Dean Witter Select Dimensions Investment Series
(49) Dean Witter Global Asset Allocation Fund
(50) Dean Witter Balanced Growth Fund
(51) Dean Witter Balanced Income Fund
(52) Dean Witter Hawaii Municipal Trust
(53) Dean Witter Capital Appreciation Fund
(54) Dean Witter Intermediate Term U.S. Treasury Trust
(55) Dean Witter Information Fund
(56) Dean Witter Japan Fund
(57) Dean Witter Income Builder Fund
(58) Dean Witter Special Value Fund
 
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

<PAGE>

 (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; Formerly Executive
                              Vice President and Director of Dean Witter,
                              Discover & Co. ("DWDC"); Director and/or officer
                              of various DWDC subsidiaries.

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

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

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

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


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

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

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

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

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

Sheldon Curtis                Assistant Secretary of DWR; Senior Vice President,
Senior Vice President,        Secretary and General Counsel of DWSC; Senior Vice
General Counsel and           President, Assistant General Counsel and Assistant
Secretary                     Secretary of Distributors; Senior Vice President
                              and Secretary of DWTC; 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 Gaylor                 
Senior Vice President         Vice President of various Dean Witter Funds.

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

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

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

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


                                        7

<PAGE>

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

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

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

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

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

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

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

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


Elizabeth A. Vetell           
Senior Vice President

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

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

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

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

Barry Fink                    First Vice President and Assistant Secretary of
First Vice President          DWSC; Assistant Secretary of the Dean Witter
and Assistant Secretary       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. 


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

Robert Zimmerman
First Vice President

Joan Allman
Vice President

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

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

Douglas Brown
Vice President

Philip Caparius
Vice President

Thomas Chronert
Vice President

Rosalie Clough
Vice President

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

B. Catherine Connelly
Vice President

Salvatore DeSteno
Vice President                Vice President of DWSC.

Frank J. DeVito               
Vice President                Vice President of DWSC.

Dwight Doolan                 
Vice President

Bruce Dunn
Vice President

Jeffrey D. Geffen
Vice President

Deborah Genovese
Vice President


                                        9

<PAGE>

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

Peter W. Gurman
Vice President

Russell Harper
Vice President

John Hechtlinger
Vice President

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

Elizabeth Hinchman
Vice President

David Hoffman
Vice President

David Johnson
Vice President

Christopher Jones
Vice President

James Kastberg
Vice President

Stanley Kapica
Vice President

Michael Knox
Vice President                Vice President of Dean Witter Convertible
                              Securities Trust.

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

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

Thomas Lawlor
Vice President

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

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

Sharon K. Milligan            
Vice President

Julie Morrone
Vice President 


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

David Myers
Vice President

James Nash
Vice President

Richard Norris
Vice President

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

Hugh Rose
Vice President

Robert Rossetti
Vice President

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

Carl F. Sadler
Vice President

Rafael Scolari
Vice President                Vice President of Prime Income Trust

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


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

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

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

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

Katherin 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.


                                       11

<PAGE>

 (6)      Dean Witter Natural Resource Development Securities Inc.
 (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 Federal Securities Trust
(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 World Wide Income Trust
(23)      Dean Witter Utilities Fund
(24)      Dean Witter Strategist Fund
(25)      Dean Witter New York Municipal Money Market Trust
(26)      Dean Witter Intermediate Income Securities
(27)      Prime Income Trust
(28)      Dean Witter European Growth Fund Inc.
(29)      Dean Witter Developing Growth Securities Trust
(30)      Dean Witter Precious Metals and Minerals Trust
(31)      Dean Witter Pacific Growth Fund Inc.
(32)      Dean Witter Multi-State Municipal Series Trust
(33)      Dean Witter Premier Income Trust
(34)      Dean Witter Short-Term U.S. Treasury Trust
(35)      Dean Witter Diversified Income Trust
(36)      Dean Witter Health Sciences Trust
(37)      Dean Witter Global Dividend Growth Securities
(38)      Dean Witter American Value Fund
(39)      Dean Witter U.S. Government Money Market Trust
(40)      Dean Witter Global Short-Term Income Fund Inc.
(41)      Dean Witter Variable Investment Series
(42)      Dean Witter Value-Added Market Series
(43)      Dean Witter Global Utilities Fund
(44)      Dean Witter High Income Securities
(45)      Dean Witter National Municipal Trust    
(46)      Dean Witter International SmallCap Fund
(47)      Dean Witter Mid-Cap Growth Fund
(48)      Dean Witter Global Asset Allocation Fund
(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
 (1)      TCW/DW Core Equity Trust
 (2)      TCW/DW North American Government Income Trust


                                       12

<PAGE>

 (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 Fund
 (9)      TCW/DW Global Telecom Trust
 (10)     TCW/DW Strategic Income Trust

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

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

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

     Michael T. Gregg                   Vice President and Assistant Secretary.


Item 30.  LOCATION OF ACCOUNTS AND RECORDS

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

Item 31.  MANAGEMENT SERVICES

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

Item 32.  UNDERTAKINGS

     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.


                                       13

 
<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 25th day of November, 1996.

                                        DEAN WITTER CONVERTIBLE SECURITIES TRUST

                                      By /s/    Sheldon Curtis 
                                         ------------------------------
                                                Sheldon Curtis
                                         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                              11/25/96
     ---------------------------
        Charles A. Fiumefreddo

(2)  Principal Financial Officer   Treasurer and Principal
                                   Accounting Officer

By   /s/Thomas F. Caloia                                    11/25/96
     ---------------------------
        Thomas F. Caloia

(3)  Majority of the Trustees

     Charles A. Fiumefreddo (Chairman)
     Philip J. Purcell

By   /s/Sheldon Curtis                                      11/25/96
     ---------------------------
        Sheldon Curtis
        Attorney-in-Fact

     Michael Bozic 
     Edwin J. Garn
     John R. Haire
     Manuel H. Johnson
     Michael E. Nugent
     John L. Schroeder
By   /s/David M. Butowsky                                   11/25/96
     ---------------------------
        David M. Butowsky
        Attorney-in-Fact

 
<PAGE>

                                  EXHIBIT INDEX


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

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

11.     --     Consent of Independent Accountants

16.     --     Schedules for Computation of Performance Quotations 

27.     --     Financial Data Schedule

 

<PAGE>



                                   BY-LAWS

                                      OF

                   DEAN WITTER CONVERTIBLE SECURITIES TRUST
                 AMENDED AND RESTATED AS OF OCTOBER 25, 1996

                                  ARTICLE I
                                 DEFINITIONS

   The terms "COMMISSION", "DECLARATION", "DISTRIBUTOR", "INVESTMENT
ADVISER", "MAJORITY SHAREHOLDER VOTE", "1940 ACT", "SHAREHOLDER", "SHARES",
"TRANSFER AGENT", "TRUST", "TRUST PROPERTY", and "TRUSTEES" have the
respective meanings given them in the Declaration of Trust of Dean Witter
Convertible Securities Trust dated May 21, 1985.

                                  ARTICLE II
                                   OFFICES

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

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

                                 ARTICLE III
                            SHAREHOLDERS' MEETINGS

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

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

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

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

<PAGE>


meeting from time to time. Any adjourned meeting may be held as adjourned
without further notice. At any adjourned meeting at which a quorum shall be
present, any business may be transacted as if the meeting had been held as
originally called.

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

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

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

   SECTION 3.8. INSPECTION OF BOOKS AND RECORDS. Shareholders shall have such
rights and procedures of inspection of the books and records of the Trust as
are granted to Shareholders under Section 32 of the Corporations Law of the
State of Maryland.

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

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

                                  ARTICLE IV
                                   TRUSTEES

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

                                          2

<PAGE>


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

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

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

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

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

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

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


                                          3

<PAGE>


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

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

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

       (2) The determination shall be made:

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

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

     (iii) By the Shareholders.

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

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

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

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

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

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

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

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


                                          4

<PAGE>


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

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

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

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

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

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

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

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

                                  ARTICLE V
                                  COMMITTEES

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

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

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

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


                                          5

<PAGE>


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

                                  ARTICLE VI
                                   OFFICERS

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

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

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

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

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

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

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

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

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


                                          6

<PAGE>


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

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

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

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

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

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

                                 ARTICLE VII
                         DIVIDENDS AND DISTRIBUTIONS

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

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

                                 ARTICLE VIII
                            CERTIFICATES OF SHARES

   SECTION 8.1. CERTIFICATES OF SHARES. Certificates for Shares of each
series or class of Shares shall be in such form and of such design as the
Trustees shall approve, subject to the right of the Trustees to change such
form and design at any time or from time to time, and shall be entered in the
records of the Trust as they are issued. Each such certificate shall bear a
distinguishing number; shall exhibit the holder's name and certify the number
of full Shares owned by such holder; shall be signed by or in the name of


                                          7

<PAGE>

the Trust by the President, or a Vice President, and countersigned by the
Secretary or an Assistant Secretary or the Treasurer and an Assistant
Treasurer of the Trust; shall be sealed with the seal; and shall contain such
recitals as may be required by law. Where any certificate is signed by a
Transfer Agent or by a Registrar, the signature of such officers and the seal
may be facsimile, printed or engraved. The Trust may, at its option,
determine not to issue a certificate or certificates to evidence Shares owned
of record by any Shareholder.

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

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

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

                                  ARTICLE IX
                                  CUSTODIAN

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

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

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

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

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

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

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


                                          8

<PAGE>


                                  ARTICLE X
                               WAIVER OF NOTICE

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

                                  ARTICLE XI
                                MISCELLANEOUS

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

   SECTION 11.2. RECORD DATE. The Trustees may fix in advance a date as the
record date for the purpose of determining Shareholders entitled to notice
of, or to vote at, any meeting of Shareholders, or Shareholders entitled to
receive payment of any dividend or the allotment of any rights, or in order
to make a determination of Shareholders for any other proper purpose. Such
date, in any case, shall be not more than ninety (90) days, and in case of a
meeting of Shareholders not less than ten (10) days, prior to the date on
which particular action requiring such determination of Shareholders is to be
taken. In lieu of fixing a record date the Trustees may provide that the
transfer books shall be closed for a stated period but not to exceed, in any
case, twenty (20) days. If the transfer books are closed for the purpose of
determining Shareholders entitled to notice of a vote at a meeting of
Shareholders, such books shall be closed for at least ten (10) days
immediately preceding such meeting.

   SECTION 11.3. SEAL. The Trustees shall adopt a seal, which shall be in
such form and shall have such inscription thereon as the Trustees may from
time to time provide. The seal of the Trust may be affixed to any document,
and the seal and its attestation may be lithographed, engraved or otherwise
printed on any document with the same force and effect as if it had been
imprinted and attested manually in the same manner and with the same effect
as if done by a Massachusetts business corporation under Massachusetts law.

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

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

                                 ARTICLE XII
                     COMPLIANCE WITH FEDERAL REGULATIONS

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


                                          9

<PAGE>

                                 ARTICLE XIII
                                  AMENDMENTS

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

                                 ARTICLE XIV
                             DECLARATION OF TRUST

   The Declaration of Trust establishing Dean Witter Convertible Securities
Trust, dated May 21, 1985, a copy of which, together with all amendments
thereto, is on file in the office of the Secretary of the Commonwealth of
Massachusetts, provides that the name Dean Witter Convertible 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 Convertible 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 Convertible Securities Trust, but the
Trust Estate only shall be liable.


                                          10


<PAGE>


                         AMENDMENT TO CUSTODY AGREEMENT


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

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

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

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

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

<PAGE>


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

                                   DEAN WITTER CONVERTIBLE SECURITIES TRUST

[SEAL]                                  By: /s/ David A Hughey
                                            ------------------------------------

Attest:

/s/ R. M. Scanlan
- ------------------------------

                                        THE BANK OF NEW YORK

[SEAL]                                  By: /s/ S. Arunston
                                            ------------------------------------

Attest:

/s/ V. Blazewicz
- ------------------------------

<PAGE>

                                   SCHEDULE A


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

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

<PAGE>


                                   SCHEDULE A


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

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





*Not yet 17(f)5 compliant

<PAGE>


CONSENT OF INDEPENDENT ACCOUNTANTS

we hereby consent to the use in the 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
November 8, 1996, relating to the financial statements and financial highlights
of Dean Witter Convertible 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
November 22, 1996

<PAGE>

               SCHEDULE FOR COMPUTATIONS OF PERFORMANCE QUOTATIONS
                          CONVERTIBLE SECURITIES TRUST



(A)  AVERAGE ANNUAL TOTAL RETURNS (I.E. STANDARDIZED COMPUTATIONS)

                _                                       _
               |        ______________________  |
FORMULA:       |       |           |
               |  /\ n |          ERV        |
          T  = |    \  |     -------------  |  - 1
               |     \ |           P       |
               |      \|          |
               |_                 _|

          T = AVERAGE ANNUAL TOTAL RETURN
          n = NUMBER OF YEARS
          ERV = ENDING REDEEMABLE VALUE
          P = INITIAL INVESTMENT

                                                      (A)
   $1,000        ERV AS OF         NUMBER OF         AVERAGE ANNUAL 
INVESTED - P       30-Sep-96       YEARS - n         TOTAL RETURN - T
- ------------     -----------       ---------         ----------------------

30-Sep-95          $1,097.00            1.00                         9.70%

30-Sep-91          $1,763.30            5.00                        12.01%

30-Sep-86          $2,024.90           10.00                         7.31%



(B)  AVERAGE ANNUAL TOTAL RETURNS WITHOUT DEDUCTION FOR APPLICABLE SALES CHARGE
     (NON STANDARD COMPUTATIONS)

(C)  TOTAL RETURN WITHOUT DEDUCTION FOR APPLICABLE SALES CHARGE (NON STANDARD
     COMPUTATIONS)

               _                                      _
               |        ______________________  |
FORMULA:       |       |           |
               |  /\ n |           EV        |
          t  = |    \  |      -------------  |  - 1
               |     \ |           P        |
               |      \|           |
               |_                  _|

                    EV
          TR =  ----------    - 1
                    P


     t = AVERAGE ANNUAL TOTAL RETURN 
        (NO DEDUCTION FOR APPLICABLE SALES CHARGE)
     n = NUMBER OF YEARS
     EV = ENDING VALUE (NO DEDUCTION FOR APPLICABLE SALES CHARGE)
     P = INITIAL INVESTMENT
     TR = TOTAL RETURN (NO DEDUCTION FOR APPLICABLE SALES CHARGE)


                               (C)                              (B)
  $1,000        EV AS OF      TOTAL          NUMBER OF          AVERAGE ANNUAL 
INVESTED - P    30-Sep-96     RETURN - TR    YEARS - n          TOTAL RETURN - t
- ------------    ---------     -----------    ----------------   ------------

   30-Sep-95    $1,147.00          14.70%                1.00           14.70%
  
   30-Sep-91    $1,783.30          78.33%                5.00           12.27%

   30-Sep-86    $2,024.90         102.49%               10.00            7.31%

(D)  GROWTH OF $10,000
(E)  GROWTH OF $50,000
(F) GROWTH OF $100,000

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


<TABLE>
<CAPTION>
$10,000        TOTAL         (D) GROWTH OF           (E) GROWTH OF           (F) GROWTH OF
INVESTED - P   RETURN - TR   $10,000 INVESTMENT - G  $50,000 INVESTMENT - G  $100,000 INVESTMENT - G
- ------------   -----------   ----------------------------------------------   ----------------------
<S>            <C>           <C>                                              <C>
31-Oct-85           142.81       $24,281                           $121,405            $242,810
</TABLE>

<PAGE>

                   SCHEDULE OF COMPUTATION OF YIELD QUOTATION
                         DW CONVERTIBLE SECURITIES TRUST
                           30 day Yield as of 9/30/96




                                    6
     YIELD = 2{ [ ((a-b)/c * d) + 1] -1}



     WHERE:    a = Dividends and interest earned during the period

               b = Expenses accrued for the period

               c = The average daily number of shares outstanding during the
                   period that were entitled to receive dividends

               d = The maximum offering price per share on the last day of the
                   period


                                                                     6
     YIELD = 2{ [(( 1,288,449.66-354,844.65)/17,849,237*12.72)+1] -1}

          =    4.985443%

 

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 6
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1996
<PERIOD-END>                               SEP-30-1996
<INVESTMENTS-AT-COST>                      220,979,577
<INVESTMENTS-AT-VALUE>                     224,288,180
<RECEIVABLES>                                3,228,016
<ASSETS-OTHER>                               9,851,399
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             237,367,595
<PAYABLE-FOR-SECURITIES>                     1,750,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,283,389
<TOTAL-LIABILITIES>                          3,033,389
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   582,151,590
<SHARES-COMMON-STOCK>                       18,422,346
<SHARES-COMMON-PRIOR>                       15,885,991
<ACCUMULATED-NII-CURRENT>                    4,914,784
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                  (356,040,771)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     3,308,603
<NET-ASSETS>                               234,334,206
<DIVIDEND-INCOME>                            2,916,746
<INTEREST-INCOME>                           10,804,205
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               3,886,943
<NET-INVESTMENT-INCOME>                      9,834,008
<REALIZED-GAINS-CURRENT>                    13,199,408
<APPREC-INCREASE-CURRENT>                    5,765,542
<NET-CHANGE-FROM-OPS>                       28,799,258
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (10,327,902)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      8,013,956
<NUMBER-OF-SHARES-REDEEMED>                (6,193,018)
<SHARES-REINVESTED>                            715,417
<NET-CHANGE-IN-ASSETS>                      48,935,841
<ACCUMULATED-NII-PRIOR>                      5,408,228
<ACCUMULATED-GAINS-PRIOR>                (369,255,129)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,234,262
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,886,943
<AVERAGE-NET-ASSETS>                       205,710,351
<PER-SHARE-NAV-BEGIN>                            11.67
<PER-SHARE-NII>                                    .55
<PER-SHARE-GAIN-APPREC>                           1.12
<PER-SHARE-DIVIDEND>                             (.62)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.72
<EXPENSE-RATIO>                                   1.89
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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