MORGAN STANLEY DEAN WITTER DEVELOPING GROWTH SECURITIES TRUS
497, 1998-11-25
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<PAGE>
                                               Filed Pursuant to Rule 497(e)
                                               Registration File No.: 811-3639

                             MORGAN STANLEY DEAN WITTER
                             DEVELOPING GROWTH SECURITIES TRUST
                             PROSPECTUS -- NOVEMBER 25, 1998
- --------------------------------------------------------------------------------

MORGAN STANLEY DEAN WITTER DEVELOPING GROWTH SECURITIES TRUST (THE "FUND") IS
AN OPEN-END DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT
OBJECTIVE IS LONG-TERM CAPITAL GROWTH. WHILE THE FUND MAY INVEST IN ALL TYPES
OF EQUITY AND DEBT SECURITIES, IT INVESTS PRIMARILY IN COMMON STOCKS OF SMALLER
AND MEDIUM-SIZED COMPANIES THAT, IN THE OPINION OF THE INVESTMENT MANAGER, HAVE
THE POTENTIAL FOR GROWING MORE RAPIDLY THAN THE ECONOMY AND WHICH MAY BENEFIT
FROM NEW PRODUCTS OR SERVICES, TECHNOLOGICAL DEVELOPMENTS OR CHANGES IN
MANAGEMENT. (SEE "INVESTMENT OBJECTIVE AND POLICIES.")

The Fund offers four classes of shares (each, a "Class"), each with a different
combination of sales charges, ongoing fees and other features. The different
distribution arrangements permit an investor to choose the method of purchasing
shares that the investor believes is most beneficial given the amount of the
purchase, the length of time the investor expects to hold the shares and other
relevant circumstances. (See "Purchase of Fund Shares--Alternative Purchase
Arrangements.")

This Prospectus sets forth concisely the information you should know before
investing in the Fund. It should be read and retained for future reference.
Additional information about the Fund is contained in the Statement of
Additional Information, dated November 25, 1998, 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.

TABLE OF CONTENTS

Prospectus Summary...........................................    2
Summary of Fund Expenses.....................................    4
Financial Highlights.........................................    5
The Fund and its Management..................................    8
Investment Objective and Policies............................    8
Risk Considerations..........................................    9
Investment Restrictions......................................   13
Purchase of Fund Shares......................................   13
Shareholder Services.........................................   22
Redemptions and Repurchases..................................   25
Dividends, Distributions and Taxes...........................   25
Performance Information......................................   26
Additional Information.......................................   27

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.

MORGAN STANLEY DEAN WITTER
DEVELOPING GROWTH SECURITIES TRUST
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550 OR
(800) 869-NEWS (TOLL-FREE)

- --------------------------------------------------------------------------------
 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 NOR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
                              A CRIMINAL OFFENSE.

           Morgan Stanley Dean Witter Distributors Inc., Distributor
<PAGE>

<TABLE>
PROSPECTUS SUMMARY
- ----------------------------------------------------------------------------------------------------------------------------
<S>               <C>
THE               The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is an
FUND              open-end diversified management investment company investing primarily in securities of smaller and
                  medium-sized companies that have the potential to grow much more rapidly than the economy (see
                  page 8).
- ----------------------------------------------------------------------------------------------------------------------------
SHARES OFFERED    Shares of beneficial interest with $0.01 par value (see page 27). The Fund offers four Classes of shares,
                  each with a different combination of sales charges, ongoing fees and other features (see pages 13-21).
- ----------------------------------------------------------------------------------------------------------------------------
MINIMUM           The minimum initial investment for each Class is $1,000 ($100 if the account is opened through
PURCHASE          EasyInvestSM). Class D shares are only available to persons investing $5 million ($25 million for
                  certain qualified plans) or more and to certain other limited categories of investors. For the purpose
                  of meeting the minimum $5 million (or $25 million) investment for Class D shares, and subject to the
                  $1,000 minimum initial investment for each Class of the Fund, an investor's existing holdings of
                  Class A and Class D shares and shares of funds for which Morgan Stanley Dean Witter Advisors Inc.
                  serves as investment manager ("Morgan Stanley Dean Witter Funds") that are sold with a front-end
                  sales charge, and concurrent investments in Class D shares of the Fund and other Morgan Stanley
                  Dean Witter Funds that are multiple class funds, will be aggregated. The minimum subsequent
                  investment is $100 (see page 13).
- ----------------------------------------------------------------------------------------------------------------------------
INVESTMENT        The investment objective of the Fund is long-term capital growth (see page 8).
OBJECTIVE
- ----------------------------------------------------------------------------------------------------------------------------
INVESTMENT        The Fund invests primarily in common stock of companies believed to have potential for significant
POLICIES          growth. However, it may also invest in convertible securities, preferred stock, bonds and warrants of
                  such companies and may engage in certain portfolio techniques, including leveraging (see page 8).
- ----------------------------------------------------------------------------------------------------------------------------
INVESTMENT        Morgan Stanley Dean Witter Advisors Inc., the Investment Manager of the Fund, and its wholly-owned
MANAGER           subsidiary, Morgan Stanley Dean Witter Services Company Inc., serve in various investment
                  management, advisory, management and administrative capacities to 100 investment companies and
                  other portfolios with net assets of approximately $117.3 billion at October 31, 1998 (see page 8).
- ----------------------------------------------------------------------------------------------------------------------------
MANAGEMENT        The Investment Manager receives a monthly fee at the annual rate of 0.50% of the Fund's daily net
FEE               assets on assets not exceeding $500 million and 0.475% of the Fund's daily net assets on assets
                  exceeding $500 million (see page 8).
- ----------------------------------------------------------------------------------------------------------------------------
DISTRIBUTOR AND   Morgan Stanley Dean Witter Distributors Inc. is the Distributor of the Fund's shares. The Fund has
DISTRIBUTION      adopted a distribution plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1
FEE               Plan") with respect to the distribution fees paid by the Class A, Class B and Class C shares of the Fund
                  to the Distributor. The entire 12b-1 fee payable by Class A and a portion of the 12b-1 fee payable by
                  each of Class B and Class C equal to 0.25% of the average daily net assets of the Class are currently
                  each characterized as a service fee within the meaning of the National Association of Securities
                  Dealers, Inc. guidelines. The remaining portion of the 12b-1 fee, if any, is characterized as an
                  asset-based sales charge (see pages 13 and 20).
- ----------------------------------------------------------------------------------------------------------------------------
ALTERNATIVE       Four classes of shares are offered:
PURCHASE
ARRANGEMENTS      o  Class A shares are offered with a front-end sales charge, starting at 5.25% and reduced for larger
                  purchases. Investments of $1 million or more (and investments by certain other limited categories of
                  investors) are not subject to any sales charge at the time of purchase but a contingent deferred sales
                  charge ("CDSC") of 1.0% may be imposed on redemptions within one year of purchase. The Fund is
                  authorized to reimburse the Distributor for specific expenses incurred in promoting the distribution
                  of the Fund's Class A shares and servicing shareholder accounts pursuant to the Fund's 12b-1 Plan.
                  Reimbursement may in no event exceed an amount equal to payments at an annual rate of 0.25% of
                  average daily net assets of the Class (see pages 13, 16 and 20).
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

2
<PAGE>

<TABLE>
- ----------------------------------------------------------------------------------------------------------------------------
<S>               <C>
                  o Class B shares are offered without a front-end sales charge, but will in most cases be subject to a CDSC
                  (scaled down from 5.0% to 1.0%) if redeemed within six years after purchase. The CDSC will be imposed on
                  any redemption of shares if after such redemption the aggregate current value of a Class B account with
                  the Fund falls below the aggregate amount of the investor's purchase payments made during the six years
                  preceding the redemption. A different CDSC schedule applies to investments by certain qualified plans.
                  Class B shares are also subject to a 12b-1 fee assessed at the annual rate of 1.0% of the lesser of: (a)
                  the average daily net sales of the Fund's Class B shares or (b) the average daily net assets of Class B.
                  All shares of the Fund held prior to July 28, 1997 have been designated Class B shares. Shares held before
                  May 1, 1997 will convert to Class A shares in May, 2007. In all other instances, Class B shares convert to
                  Class A shares approximately ten years after the date of the original purchase (see pages 13, 18 and 20).

                  o Class C shares are offered without a front-end sales charge, but will in most cases be subject to a CDSC
                  of 1.0% if redeemed within one year after purchase. The Fund is authorized to reimburse the Distributor
                  for specific expenses incurred in promoting the distribution of the Fund's Class C shares and servicing
                  shareholder accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount
                  equal to payments at an annual rate of 1.0% of average daily net assets of the Class (see pages 13 
                  and 20).

                  o Class D shares are offered only to investors meeting an initial investment minimum of $5 million ($25
                  million for certain qualified plans) and to certain other limited categories of investors. Class D shares
                  are offered without a front-end sales charge or CDSC and are not subject to any 12b-1 fee (see pages 13
                  and 20).
- ----------------------------------------------------------------------------------------------------------------------------
DIVIDENDS AND     Dividends from net investment income and distributions from net capital gains, if any, are paid at least
CAPITAL GAINS     once per year. Dividends and capital gains distributions paid on shares of a Class are automatically
DISTRIBUTIONS     reinvested in additional shares of the same Class at net asset value unless the shareholder elects to
                  receive cash. The Fund may, however, determine to retain all or part of any net long-term capital gains in
                  any year for reinvestment. Shares acquired by dividend and distribution reinvestment will not be subject
                  to any sales charge or CDSC (see pages 22 and 25).
- ----------------------------------------------------------------------------------------------------------------------------
REDEMPTION        Shares are redeemable by the shareholder at net asset value less any applicable CDSC on Class A, Class B
                  or Class C shares. An account may be involuntarily redeemed if the total value of the account is less than
                  $100 or, if the account was opened through EasyInvestSM, if after twelve months the shareholder has
                  invested less than $1,000 in the account (see page 25).
- ----------------------------------------------------------------------------------------------------------------------------
RISKS             The net asset value of the Fund's shares will fluctuate with changes in the market value of its portfolio
                  securities. The Fund is intended for long-term investors who can accept the risks involved in seeking
                  long-term growth of capital through investment primarily in the securities of small and medium-sized
                  growth companies. It should be recognized that investing in such companies involves greater risk than is
                  customarily associated with more established companies. In addition, investors should consider the risks
                  which may be involved in certain of the investment policies and techniques which the Fund may employ in
                  its operations, including leveraging and investments in foreign securities (see pages 8-13).
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

 The above is qualified in its entirety by the detailed information appearing
 elsewhere in this Prospectus and in the Statement of Additional Information.

                                                                               3
<PAGE>

SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------

The following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are based on the
expenses and fees for the fiscal year ended September 30, 1998.

<TABLE>
<CAPTION>
                                                               Class A         Class B         Class C        Class D
                                                               -------         -------         -------        -------
<S>                                                             <C>             <C>             <C>             <C>
SHAREHOLDER TRANSACTION EXPENSES

Maximum Sales Charge Imposed on Purchases (as a percentage of
 offering price) ............................................   5.25%(1)        None            None            None
Sales Charge Imposed on Dividend Reinvestments ..............   None            None            None            None
Maximum Contingent Deferred Sales Charge
 (as a percentage of original purchase price or redemption
 proceeds) ..................................................   None(2)         5.00%(3)        1.00%(4)        None
Redemption Fees .............................................   None            None            None            None
Exchange Fee ................................................   None            None            None            None

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)

Management Fees .............................................   0.49%           0.49%           0.49%           0.49%
12b-1 Fees (5) (6) ..........................................   0.25%           1.00%           1.00%           None
Other Expenses ..............................................   0.20%           0.20%           0.20%           0.20%
Total Fund Operating Expenses ...............................   0.94%           1.69%           1.69%           0.69%
</TABLE>

- ---------
(1)   Reduced for purchases of $25,000 and over (see "Purchase of Fund
      Shares--Initial Sales Charge Alternative--Class A Shares").

(2)   Investments that are not subject to any sales charge at the time of
      purchase are subject to a CDSC of 1.00% that will be imposed on
      redemptions made within one year after purchase, except for certain
      specific circumstances (see "Purchase of Fund Shares--Initial Sales
      Charge Alternative--Class A Shares").

(3)   The CDSC is scaled down to 1.00% during the sixth year, reaching zero
      thereafter.

(4)   Only applicable to redemptions made within one year after purchase (see
      "Purchase of Fund Shares--Level Load Alternative--Class C Shares").

(5)   The 12b-1 fee is accrued daily and payable monthly. The entire 12b-1 fee
      payable by Class A and a portion of the 12b-1 fee payable by each of
      Class B and Class C equal to 0.25% of the average daily net assets of the
      Class are currently each characterized as a service fee within the
      meaning of National Association of Securities Dealers, Inc. ("NASD")
      guidelines and are payments made for personal service and/or maintenance
      of shareholder accounts. The remainder of the 12b-1 fee, if any, is an
      asset-based sales charge, and is a distribution fee paid to the
      Distributor to compensate it for the services provided and the expenses
      borne by the Distributor and others in the distribution of the Fund's
      shares (see "Purchase of Fund Shares--Plan of Distribution").

(6)   Upon conversion of Class B shares to Class A shares, such shares will be
      subject to the lower 12b-1 fee applicable to Class A shares. No sales
      charge is imposed at the time of conversion of Class B shares to Class A
      shares. Class C shares do not have a conversion feature and, therefore,
      are subject to an ongoing 1.00% distribution fee (see "Purchase of Fund
      Shares--Alternative Purchase Arrangements").

<PAGE>
<TABLE>
<CAPTION>
                                                                             1 Year     3 Years     5 Years     10 Years
                                                                             ------     -------     -------     --------
<S>                                                                         <C>        <C>         <C>         <C>
You would pay the following expenses on a $1,000 investment assuming
(1) a 5% annual return and (2) redemption at the end of each time period:
  Class A ...............................................................      $62        $81         $102        $162
  Class B ...............................................................      $67        $83         $112        $200
  Class C ...............................................................      $27        $53         $ 92        $200
  Class D ...............................................................      $ 7        $22         $ 39        $ 86

You would pay the following expenses on the same $1,000 investment
assuming no redemption at the end of the period:
  Class A ...............................................................      $62        $81         $102        $162
  Class B ...............................................................      $17        $53         $ 92        $200
  Class C ...............................................................      $17        $53         $ 92        $200
  Class D ...............................................................      $ 7        $22         $ 39        $ 86
</TABLE>

THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS MAY BE GREATER OR LESS
THAN THOSE SHOWN.

The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Fund will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Fund and its Management," "Purchase of Fund Shares--Plan of Distribution"
and "Redemptions and Repurchases."

Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.

4
<PAGE>

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by PricewaterhouseCoopers
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,
                                       -----------------------------------------------------
                                         1998++           1997*++        1996         1995
                                         ------           -------        ----         ----
<S>                                     <C>               <C>          <C>          <C>     
CLASS B SHARES
PER SHARE OPERATING PERFORMANCE:
 Net asset value, beginning
  of period ......................      $  27.46          $  27.71     $  25.54     $  17.55
                                        --------          --------     --------     --------
 Net investment income
  (loss) .........................         (0.20)            (0.28)       (0.23)       (0.19)
 Net realized and unrealized
  gain (loss) ....................         (4.76)             3.92         4.32         8.34
                                        --------          --------     --------     --------
 Total from investment
  operations .....................         (4.96)             3.64         4.09         8.15
                                        --------          --------     --------     --------
 Less dividends and
  distributions from:
   Net investment income                      --                --           --           --
   Net realized gain .............         (2.31)            (3.89)       (1.92)       (0.16)
                                        --------          --------     --------     --------
 Total dividends and
  distributions ..................         (2.31)            (3.89)       (1.92)       (0.16)
                                        --------          --------     --------     --------
 Net asset value, end of
  period .........................      $  20.19          $  27.46     $  27.71     $  25.54
                                        ========          ========     ========     ========
TOTAL INVESTMENT RETURN+ .........        (18.88)%           16.38%       17.53%       46.87%

RATIOS TO AVERAGE NET ASSETS:
 Expenses ........................          1.69%(1)          1.68%        1.69%        1.77%
 Net investment income
  (loss) .........................         (0.98)%(1)        (1.21)%      (1.03)%      (1.04)%

SUPPLEMENTAL DATA:
 Net assets, end of period,
  in thousands ...................      $596,834          $877,539     $799,201     $534,869
 Portfolio turnover rate .........           178%              154%         149%         114%

<CAPTION>
<PAGE>
                                                          For the Year Ended September 30,
                                      ---------------------------------------------------------------------------
                                        1994           1993        1992           1991       1990          1989
                                        ----           ----        ----           ----       ----          ----
<S>                                   <C>            <C>         <C>            <C>        <C>           <C>    
CLASS B SHARES
PER SHARE OPERATING PERFORMANCE:
 Net asset value, beginning
  of period ......................    $  20.50       $  12.20    $  14.05       $   8.92   $ 11.33       $  9.67
                                      --------       --------    --------       --------   -------       -------
 Net investment income
  (loss) .........................          --          (0.12)      (0.12)         (0.07)    (0.15)         0.04
 Net realized and unrealized
  gain (loss) ....................       (1.82)          8.42       (1.73)          5.20     (2.21)         1.62
                                      --------       --------    --------       --------   -------       -------
 Total from investment
  operations .....................       (1.82)          8.30       (1.85)          5.13     (2.36)         1.66
                                      --------       --------    --------       --------   -------       -------
 Less dividends and
  distributions from:
   Net investment income                    --             --          --             --     (0.05)           --
   Net realized gain .............       (1.13)            --          --             --        --            --
                                      --------       --------    --------       --------   -------       -------
 Total dividends and
  distributions ..................       (1.13)            --          --             --     (0.05)           --
                                      --------       --------    --------       --------   -------       -------
 Net asset value, end of
  period .........................    $  17.55       $  20.50    $  12.20       $  14.05   $  8.92       $ 11.33
                                      ========       ========    ========       ========   =======       =======
TOTAL INVESTMENT RETURN+ .........       (8.88)%        67.95%     (13.17)%        57.51%   (20.87)%       17.17%

RATIOS TO AVERAGE NET ASSETS:
 Expenses ........................        1.78%          1.84%       1.86%          1.92%     2.02%         1.89%
 Net investment income
  (loss) .........................       (1.32)%        (1.52)%     (1.14)%        (0.73)%   (1.32)%        0.59%

SUPPLEMENTAL DATA:
 Net assets, end of period,
  in thousands ...................    $340,169       $240,389    $112,982       $115,337   $67,604       $89,236
 Portfolio turnover rate .........         160%           203%        153%            88%       53%           84%
</TABLE>

- --------------
*    Prior to July 28, 1997, the Fund issued one class of shares. All shares of
     the Fund held prior to that date have been designated Class B shares.

++   The per share amounts were computed using an average number of shares
     outstanding during the period.

+    Does not reflect the deduction of sales charge. Calculated based on the
     net asset value as of the last business day of the period.

(1)  Reflects overall Fund ratios for investment income and non-class specific
     expenses.

                                                                               5
<PAGE>

FINANCIAL HIGHLIGHTS--Continued
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                    For the Period
                                                            For the Year            July 28, 1997*
                                                                Ended                  through
                                                        September 30, 1998++     September 30, 1997++
                                                        --------------------     --------------------
<S>                                                           <C>                     <C>   
CLASS A SHARES
PER SHARE OPERATING PERFORMANCE:
 Net asset value, beginning of period ..............          $ 27.50                 $24.62
                                                              -------                 ------
 Net investment loss ...............................           (0.06)                  (0.02)
 Net realized and unrealized gain (loss) ...........           (4.75)                   2.90
                                                              -------                 ------
 Total from investment operations ..................           (4.81)                   2.88
                                                              -------                 ------
  Less distributions from net realized gain.........           (2.31)                     --
                                                              -------                 ------
 Net asset value, end of period ....................          $ 20.38                 $27.50
                                                              =======                 ======
TOTAL INVESTMENT RETURN+ ...........................           (18.26)%                11.70%(1)

RATIOS TO AVERAGE NET ASSETS:
 Expenses ..........................................             0.94%(3)               0.99%(2)
 Net investment loss ...............................            (0.23)%(3)             (0.46)%(2)

SUPPLEMENTAL DATA:
 Net assets, end of period, in thousands ...........          $ 5,822                 $  978
 Portfolio turnover rate ...........................              178%                   154%

CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
 Net asset value, beginning of period ..............          $ 27.46                 $24.62
                                                              -------                 ------
 Net investment loss ...............................            (0.23)                 (0.05)
 Net realized and unrealized gain (loss) ...........            (4.73)                  2.89
                                                              -------                 ------
 Total from investment operations ..................            (4.96)                  2.84
                                                              -------                 ------
  Less distributions from net realized gain.........            (2.31)                    --
                                                              -------                 ------
 Net asset value, end of period ....................          $ 20.19                 $27.46
                                                              =======                 ======
TOTAL INVESTMENT RETURN+ ...........................           (18.88)%                11.54%(1)

RATIOS TO AVERAGE NET ASSETS:
 Expenses ..........................................            1.69%(3)                1.71%(2)
 Net investment loss ...............................           (0.98)%(3)              (1.19)%(2)

SUPPLEMENTAL DATA:
 Net assets, end of period, in thousands ...........         $ 2,185                  $1,066
 Portfolio turnover rate ...........................             178%                    154%
</TABLE>

- ---------
*    The date shares were first issued.
++   The per share amounts were computed using an average number of shares
     outstanding during the period.
+    Does not reflect the deduction of sales charge. Calculated based on the
     net asset value as of the last business day of the period.
(1)  Not annualized.
(2)  Annualized.
(3)  Reflects overall Fund ratios for investment income and non-class specific
     expenses.

6
<PAGE>

FINANCIAL HIGHLIGHTS--Continued
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                    For the Period
                                                            For the Year            July 28, 1997*
                                                                Ended                  through
                                                        September 30, 1998++     September 30, 1997++
                                                        --------------------     --------------------
<S>                                                          <C>                      <C>   
CLASS D SHARES
PER SHARE OPERATING PERFORMANCE:
 Net asset value, beginning of period ..............         $ 27.51                  $24.62
                                                             -------                  ------
 Net investment income (loss) ......................            0.01                   (0.01)
 Net realized and unrealized gain (loss) ...........           (4.77)                   2.90
                                                             -------                  ------
 Total from investment operations ..................           (4.76)                   2.89
                                                             -------                  ------
  Less distributions from net realized gain.........           (2.31)                     --
                                                             -------                  ------
 Net asset value, end of period ....................         $ 20.44                  $27.51
                                                             =======                  ======
TOTAL INVESTMENT RETURN+ ...........................          (18.05)%                 11.74%(1)
                                                            
RATIOS TO AVERAGE NET ASSETS:                               
 Expenses ..........................................            0.69%(3)                0.70%(2)
 Net investment income (loss) ......................            0.02%(3)               (0.20)%(2)
                                                            
SUPPLEMENTAL DATA:                                          
 Net assets, end of period, in thousands ...........         $ 3,291                  $   22
 Portfolio turnover rate ...........................             178%                    154%
</TABLE>                                                 

- ---------
*    The date shares were first issued.
++   The per share amounts were computed using an average number of shares
     outstanding during the period.
+    Calculated based on the net asset value as of the last business day of the
     period.
(1)  Not annualized.
(2)  Annualized.
(3)  Reflects overall Fund ratios for investment income and non-class specific
     expenses.

                                                                               7
<PAGE>

THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------

Morgan Stanley Dean Witter Developing Growth Securities Trust (formerly named
Dean Witter Developing Growth Securities Trust) (the "Fund") is an open-end
diversified management investment company. The Fund is a trust of the type
commonly known as a "Massachusetts business trust" and was organized under the
laws of Massachusetts on December 28, 1982.

      Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors" 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 is a
wholly-owned subsidiary of Morgan Stanley Dean Witter & Co., a preeminent
global financial services firm that maintains leading market positions in each
of its three primary businesses--securities, asset management and credit
services. The Investment Manager, which was incorporated in July, 1992 under
the name Dean Witter InterCapital Inc., changed its name to Morgan Stanley Dean
Witter Advisors Inc. on June 22, 1998.

      MSDW Advisors and its wholly-owned subsidiary, Morgan Stanley Dean Witter
Services Company Inc. ("MSDW Services"), serve in various investment
management, advisory, management and administrative capacities to 100
investment companies, 28 of which are listed on the New York Stock Exchange,
with combined total assets of approximately $112.9 billion as of October 31,
1998. The Investment Manager also manages portfolios of pension plans, other
institutions and individuals which aggregated approximately $4.4 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. MSDW Advisors has retained MSDW Services to perform the
aforementioned administrative services for the Fund.

      The Fund's Board of Trustees reviews 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 annual rate of 0.50% to the Fund's net assets not exceeding $500 million
and 0.475% to the Fund's net assets exceeding $500 million. For the fiscal year
ended September 30, 1998, the Fund accrued total compensation to the Investment
Manager amounting to 0.49% of the Fund's average daily net assets and the total
expenses of each Class amounted to 0.94%, 1.69%, 1.69% and 0.69% of the average
daily net assets of Class A, Class B, Class C and Class D, respectively.

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------

The investment objective of the Fund is long-term capital growth. There is no
assurance that the objective will be achieved. This objective is fundamental
and may not be changed without shareholder approval. The following policies may
be changed by the Board of Trustees without shareholder approval.

      The Fund seeks to achieve capital growth which significantly exceeds the
historical total return of common stocks as measured by the Standard & Poor's
500 index. The primary emphasis is on the securities of smaller and
medium-sized companies that, in the opinion of the Investment Manager, have the
potential to grow much more rapidly than the economy; at times, investments may
also be made in the securities of larger, established companies which also have
such growth potential. The Fund will normally invest at least 65% of its total
assets in the securities of such companies. In addition to common stock, this
portion of the portfolio may also include convertible securities, preferred
stocks and warrants.

      The Investment Manager attempts to identify companies whose earnings
growth will be significantly higher than the average. Dividend income is not
generally a consideration in the selection of stocks for purchase.

      The Investment Manager focuses its stock selection for the Fund upon a
diversified group of emerging growth companies which have moved beyond the
difficult and extremely risky "start-up" phase and which at the time of
selection show positive earnings with the prospects of achieving significant
further profit gains in at least the next two-to-three years after acquisition.
New technologies, techniques, products or services, cost-reducing measures,
changes in management, capitalization or asset deployment, changes in
government regulations or favorable shifts in other external circumstances may
all contribute to the anticipated phase of growth.

8
<PAGE>

      The application of the Fund's investment policies is basically dependent
upon the judgment of the Investment Manager. The proportions of the Fund's
assets invested in particular industries will shift from time to time in
accordance with the judgment of the Investment Manager.

      The Fund may invest up to 35% of its total assets in fixed-income
securities issued or guaranteed by the U.S. Government, its agencies or
instrumentalities, corporate debt securities which are rated at the time of
purchase Baa or better by Moody's Investors Service Inc. or BBB or better by
Standard & Poor's Corporation or which, if not rated, are deemed to be of
comparable quality by the Investment Manager (including zero coupon
securities), and money market instruments. There may be periods during which,
in the opinion of the Investment Manager, general market conditions warrant
reduction of some or all of the Fund's securities holdings. During such
periods, the Fund may adopt a temporary "defensive" posture in which greater
than 35% of its total assets are invested in cash or money market instruments,
including obligations issued or guaranteed as to principal or interest by the
U.S. Government, its agencies or instrumentalities, certificates of deposit,
bankers' acceptances and other obligations of domestic banks having total
assets of $1 billion or more, and short-term commercial paper of corporations
organized under the laws of any state or political subdivision of the United
States.

      The securities in which the Fund invests may or may not be listed on a
national stock exchange, but if they are not so listed, will generally have an
established over-the-counter market.

      The Fund may invest in foreign securities, real estate investment trusts
and private placements, enter into repurchase agreements, borrow money for the
purpose of leveraging its investments, purchase securities on a when-issued or
delayed delivery basis, purchase or sell securities on a forward commitment
basis, purchase securities on a "when, as and if issued" basis, and lend its
portfolio securities, as discussed under "Risk Considerations" below.


RISK CONSIDERATIONS

The net asset value of the Fund's shares will fluctuate with changes in the
market value of its portfolio securities. The market value of the Fund's
portfolio securities will increase or decrease due to a variety of economic,
market or political factors which cannot be predicted. The Fund is intended for
long-term investors who can accept the risks involved in seeking long-term
growth of capital through investment primarily in the securities of small and
medium-sized growth companies. It should be recognized that investing in such
companies involves greater risk than is customarily associated with investing
in more established companies.

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). When purchasing
foreign securities, the Fund may enter into foreign currency exchange
transactions or forward foreign exchange contracts to facilitate settlement.
The Fund may utilize forward foreign exchange contracts in these instances as
an attempt to limit the effect of changes in the relationship between the U.S.
dollar and the foreign currency during the period between the trade date and
settlement date for the transaction.

      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. Fluctuations in the relative rates
of exchange between different currencies will affect the value of the Fund's
investments denominated in foreign currency. Changes in foreign currency
exchange rates relative to the U.S. dollar will affect the U.S. dollar value of
the Fund's assets denominated in that currency and thereby impact upon the
Fund's total return on such assets.

      Foreign currency exchange rates are determined by forces of supply and
demand on the foreign exchange markets. These forces are themselves affected by
the international balance of payments and other economic and financial
conditions, government intervention, speculation and other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of
the exchanges on which the currencies trade. The Fund will incur costs in
connection with conversions between various currencies.

      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. Foreign companies are not subject to the regulatory requirements
of U.S. companies and, as such, there may be less publicly available
information about such companies. Moreover, foreign companies are not subject
to uniform accounting, auditing and financial reporting standards and
requirements comparable to those applicable to U.S. companies. Finally, in the
event of

                                                                               9
<PAGE>

a default of any foreign debt obligations, it may be more difficult for the
Fund to obtain or enforce a judgment against the issuers of such securities.

      Securities of foreign issuers may be less liquid than comparable
securities of U.S. issuers and, as such, their price changes may be more
volatile. Furthermore, foreign exchanges and broker-dealers are generally
subject to less government and exchange scrutiny and regulation than their
American counterparts. Brokerage commissions, dealer concessions and other
transaction costs may be higher on foreign markets than in the U.S. In
addition, differences in clearance and settlement procedures in foreign markets
may occasion delays in settlements of the Fund's trades effected in such
markets. As such, the inability to dispose of portfolio securities due to
settlement delays could result in losses to the Fund due to subsequent declines
in value of such securities and the inability of the Fund to make intended
security purchases due to settlement problems could result in a failure of the
Fund to make potentially advantageous investments. Investments in certain
Canadian issuers may be speculative due to certain political risks and may be
subject to substantial price fluctuations.

      Many European countries are about to adopt a single European currency,
the euro (the "Euro Conversion"). The consequences of the Euro Conversion for
foreign exchange rates, interest rates and the value of European securities
eligible for purchase by the Fund are presently unclear. Such consequences may
adversely affect the value and/or increase the volatility of securities held by
the Fund.

REPURCHASE AGREEMENTS. The Fund may enter into repurchase agreements, which may
be viewed as a type of secured lending by the Fund, and which typically involve
the acquisition by the Fund of debt securities from a selling financial
institution such as a bank, savings and loan association or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that
the institution will repurchase, the underlying security at a specified price
and at a fixed time in the future, usually not more than seven days from the
date of purchase. While repurchase agreements involve certain risks not
associated with direct investments in debt securities, the Fund follows
procedures designed to minimize those risks. These procedures include effecting
repurchase transactions only with large, well-capitalized and well-established
financial institutions whose financial condition will be continually monitored
by the Investment Manager subject to procedures established by the Board of
Trustees of the Fund. In addition, the value of the collateral underlying the
repurchase agreement will be at least equal to the repurchase price, including
any accrued interest earned on the repurchase agreement. In the event of a
default or bankruptcy by a selling financial institution, the Fund will seek to
liquidate such collateral. However, the exercising of the Fund's right to
liquidate such collateral could involve certain costs or delays and, to the
extent that proceeds from any sale upon a default of the obligation to
repurchase were less than the repurchase price, the Fund could suffer a loss.
The Fund may not invest in repurchase agreements that do not mature within
seven days if any such investment, together with any other illiquid assets held
by the Fund, amounts to more than 15% of its net assets.

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 below, are not subject to the
foregoing restriction.) These securities are generally referred to as private
placements or restricted securities. 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.
Limitations on the resale of private placements 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. In the case of restricted securities determined to be "liquid"
pursuant to Rule 144A under the Securities Act, the Fund's illiquidity could
increase if qualified institutional buyers become unavailable.

CONVERTIBLE SECURITIES. A convertible security is a bond, debenture, note,
preferred stock or other security that may be converted into or exchanged for a
prescribed amount of common stock of the same or a different issuer within a
particular period of time at a specified price or formula. 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

10
<PAGE>

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 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, the
convertible security 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.

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.

ZERO COUPON SECURITIES. A portion of the fixed-income securities purchased by
the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive
their full value at maturity. The interest earned on such securities is,
implicitly, automatically compounded and paid out at maturity. While such
compounding at a constant rate eliminates the risk of receiving lower yields
upon reinvestment of interest if prevailing interest rates decline, the owner
of a zero coupon security will be unable to participate in higher yields upon
reinvestment of interest received on interest-paying securities if prevailing
interest rates rise.

      A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will
not receive current cash available for distribution to shareholders. In
addition, zero coupon securities are subject to substantially greater price
fluctuations during periods of changing prevailing interest rates than are
comparable securities which pay interest on a current basis. Current federal
tax law requires that a holder (such as the Fund) of a zero coupon security
accrue a portion of the discount at which the security was purchased as income
each year even though the Fund receives no interest payments in cash on the
security during the year.

LEVERAGING. The Fund may borrow money, but only from a bank and in an amount up
to 25% of the value of the Fund's total assets (including the amount borrowed)
less its liabilities (not including any borrowings but including the fair
market value at the time of computation of any other senior securities then
outstanding). When the Fund borrows it will be because it seeks to enhance
capital appreciation by leveraging its investments through purchasing
securities with the borrowed funds. The Fund will be required to maintain an
asset coverage (including the proceeds of borrowings) of at least 300% of such
borrowings in accordance with the provisions of the Investment Company Act of
1940 (the "Act"). The investment policy also provides that the Fund may not
purchase or sell a security on margin.

      Borrowings for leveraging will be subject to current margin requirements
of the Federal Reserve Board and where necessary the Fund may use any or all of
its securities as collateral for such borrowings. Any investment gains made
with the additional monies in excess of interest paid will cause the net asset
value of the Fund's shares to rise to a greater extent than would otherwise be
the case. Conversely, if the investment performance of the additional monies
fails to cover their cost to the Fund, net asset value will decrease to a
greater extent than would otherwise be the case. This is the speculative factor
involved in leverage. If, due to market fluctuations or other reasons, the
value of the Fund's assets (including the proceeds of borrowings) becomes at
any time less than three times the amount of any outstanding bank debt, the
Fund, within three business days, will reduce its bank debt to the extent
necessary to meet the required 300% asset coverage. In doing this, the Fund may
have to sell a portion of its investments at a time when it may be
disadvantageous to do so.

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. There is no overall limit on
the percentage of the Fund's assets which may be committed to the purchase of
securities on a when-issued, delayed delivery or forward commitment basis. An
increase in the percentage of the

                                                                              11
<PAGE>

Fund's assets committed to the purchase of securities on a when-issued, delayed
delivery or forward commitment basis may increase the volatility of the Fund's
net asset value.

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, leveraged buyout or debt restructuring. If the anticipated
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 the Fund's net asset value.

LENDING OF PORTFOLIO SECURITIES. Consistent with applicable regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers
and other financial institutions, provided that such loans are callable at any
time by the Fund (subject to certain notice provisions described in the
Statement of Additional Information), and are at all times secured by cash or
money market instruments, which are maintained in a segregated account pursuant
to applicable regulations and that are equal to at least the market value,
determined daily, of the loaned securities. As with any extensions of credit,
there are risks of delay in recovery and in some cases even loss of rights in
the collateral should the borrower of the securities fail financially. However,
loans of portfolio securities will only be made to firms deemed by the
Investment Manager to be creditworthy and when the income which can be earned
from such loans justifies the attendant risks.

YEAR 2000. The investment management services provided to the Fund by the
Investment Manager and the services provided to shareholders by the Distributor
and the Transfer Agent depend on the smooth functioning of their computer
systems. Many computer software systems in use today cannot recognize the year
2000, but revert to 1900 or some other date, due to the manner in which dates
were encoded and calculated. That failure could have a negative impact on the
handling of securities trades, pricing and account services. The Investment
Manager, the Distributor and the Transfer Agent have been actively working on
necessary changes to their own computer systems to prepare for the year 2000
and expect that their systems will be adapted before that date, but there can
be no assurance that they will be successful, or that interaction with other
non-complying computer systems will not impair their services at that time.

      In addition, it is possible that the markets for securities in which the
Fund invests may be detrimentally affected by computer failures throughout the
financial services industry beginning January 1, 2000. Improperly functioning
trading systems may result in settlement problems and liquidity issues. In
addition, corporate and governmental data processing errors may result in
production problems for individual companies and overall economic
uncertainties. Earnings of individual issuers will be affected by remediation
costs, which may be substantial and may be reported inconsistently in U.S. and
foreign financial statements. Accordingly, the Fund's investments may be
adversely affected.

      For additional risk disclosure, please refer to the "Investment Objective
and Policies" section of the Prospectus and to the "Investment Practices and
Policies" section of the Statement of Additional Information.


PORTFOLIO MANAGEMENT

The Fund's portfolio is actively managed by its Investment Manager with a view
to achieving the Fund's investment objective. No particular emphasis is given
to investments in securities for the purpose of earning current income. In
determining which securities to purchase for the Fund or hold in the Fund's
portfolio, the Investment Manager will rely on information from various
sources, including research, analysis and appraisals of brokers and dealers,
including Dean Witter Reynolds Inc., Morgan Stanley & Co. Incorporated and
other broker-dealers that are affiliates of the Investment Manager, and the
Investment Manager's own analysis of factors it deems relevant. The Fund is
managed within MSDW Advisors' Growth Group, which manages 31 funds and fund
portfolios, with approximately $11.6 billion in assets at October 31, 1998.
Jayne Stevlingson, Senior Vice President of MSDW Advisors and a member of MSDW
Advisors' Growth Group, is the primary portfolio manager of the Fund. Ms.
Stevlingson has been a portfolio manager of the Fund since September, 1994 and
has been the sole portfolio manager of the Fund since November, 1995. She has
been a portfolio manager with MSDW Advisors for over five years.

      Pursuant to an order of the Securities and Exchange Commission, the Fund
may effect principal transactions in certain money market instruments with Dean
Witter Reynolds Inc. In addition, the Fund may incur brokerage commissions on
transactions conducted through Dean Witter Reynolds Inc., Morgan Stanley & Co.
Incorporated and other brokers and dealers that are affiliates of MSDW
Advisors.

      The portfolio trading engaged in by the Fund may result in its portfolio
turnover rate exceeding 200%,

12
<PAGE>

although it is not anticipated that this rate will exceed 300%. The Fund will
incur brokerage costs commensurate with its portfolio turnover rate, and thus a
higher level (over 100%) of portfolio transactions will increase the Fund's
overall brokerage expenses. See "Dividends, Distributions and Taxes" for a
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.

INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------

The investment restrictions listed below have been adopted by the Fund as
fundamental policies, along with certain other investment restrictions. Under
the Act, a fundamental policy may not be changed without the vote of a majority
of the outstanding voting securities of the Fund, as defined in the Act.

      The Fund may not:

      1. Invest more than 5% of the value of its total assets in the securities
of any one issuer (other than obligations issued, or guaranteed, by the United
States Government, its agencies or instrumentalities).

      2. Purchase more than 10% of all outstanding voting securities or any
class of securities of any one issuer.

      3. Concentrate its investments in any particular industry, but if deemed
appropriate for attainment of its investment objective, up to 25% of its total
assets (valued at the time of investment) may be invested in any one industry
classification used by the Fund for investment purposes. This restriction does
not apply to obligations issued or guaranteed by the United States Government
or its agencies or instrumentalities.

      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 from banks for investment purposes or as a
temporary measure for extraordinary or emergency purposes, within the limits
set forth in the Act (see "Leveraging," above).

      If a percentage restriction is adhered to at the time of investment, a
later increase or decrease in percentage resulting from a change in values of
portfolio securities or amount of total or net assets will not be considered a
violation of any of the foregoing restrictions.

      Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objective by investing all or substantially all
of its assets in another investment company having substantially the same
investment objective and policies as the Fund.

PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------

GENERAL

The Fund offers each class of its shares for sale to the public on a continuous
basis. Pursuant to a Distribution Agreement between the Fund and Morgan Stanley
Dean Witter Distributors Inc. ("MSDW Distributors" or the "Distributor"), an
affiliate of the Investment Manager, shares of the Fund are distributed by the
Distributor and offered by Dean Witter Reynolds Inc. ("DWR"), a selected dealer
and subsidiary of Morgan Stanley Dean Witter & Co., and other dealers who have
entered into selected dealer agreements with the Distributor ("Selected Broker-
Dealers"). It is anticipated that DWR will undergo a change of corporate name
which is expected to incorporate the brand name of "Morgan Stanley Dean
Witter," pending approval of various regulatory authorities. The principal
executive office of the Distributor is located at Two World Trade Center, New
York, New York 10048.

      The Fund offers four classes of shares (each, a "Class"). Class A shares
are sold to investors with an initial sales charge that declines to zero for
larger purchases; however, Class A shares sold without an initial sales charge
are subject to a contingent deferred sales charge ("CDSC") of 1.0% if redeemed
within one year of purchase, except for certain specific circumstances. Class B
shares are sold without an initial sales charge but are subject to a CDSC
(scaled down from 5.0% to 1.0%) payable upon most redemptions within six years
after purchase. (Class B shares purchased by certain qualified plans are
subject to a CDSC scaled down from 2.0% to 1.0% if redeemed within three years
after purchase.) Class C shares are sold without an initial sales charge but
are subject to a CDSC of 1.0% on most redemptions made within one year after
purchase. Class D shares are sold without an initial sales charge or CDSC and
are available only to investors meeting an initial investment minimum of $5
million ($25 million for certain qualified plans), and to certain other limited
categories of investors. At the discretion of the Board of Trustees of the
Fund, Class A

                                                                              13
<PAGE>

shares may be sold to categories of investors in addition to those set forth in
this prospectus at net asset value without a front-end sales charge, and Class
D shares may be sold to certain other categories of investors, in each case as
may be described in the then current prospectus of the Fund. See "Alternative
Purchase Arrangements--Selecting a Particular Class" for a discussion of
factors to consider in selecting which Class of shares to purchase.

      The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are only available to persons investing $5 million ($25 million
for certain qualified plans) or more and to certain other limited categories of
investors. For the purpose of meeting the minimum $5 million (or $25 million)
initial investment for Class D shares, and subject to the $1,000 minimum
initial investment for each Class of the Fund, an investor's existing holdings
of Class A and Class D shares of the Fund and other Morgan Stanley Dean Witter
Funds that are multiple class funds ("Morgan Stanley Dean Witter Multi-Class
Funds") and shares of Morgan Stanley Dean Witter Funds sold with a front-end
sales charge ("FSC Funds") and concurrent investments in Class D shares of the
Fund and other Morgan Stanley Dean Witter Multi-Class Funds will be aggregated.
Subsequent purchases of $100 or more may be made by sending a check, payable to
Morgan Stanley Dean Witter Developing Growth Securities Trust, directly to
Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent" or "MSDW Trust") at
P.O. Box 1040, Jersey City, NJ 07303 or by contacting a Morgan Stanley Dean
Witter Financial Advisor or other Selected Broker-Dealer representative. When
purchasing shares of the Fund, investors must specify whether the purchase is
for Class A, Class B, Class C or Class D shares. If no Class is specified, the
Transfer Agent will not process the transaction until the proper Class is
identified. The minimum initial purchase in the case of investments through
EasyInvestSM, an automatic purchase plan (see "Shareholder Services"), is $100,
provided that the schedule of automatic investments will result in investments
totalling $1,000 within the first twelve months. The minimum initial purchase
in the case of an "Education IRA" is $500, if the Distributor has reason to
believe that additional investments will increase the investment in the account
to $1,000 within three years. In the case of investments pursuant to (i)
Systematic Payroll Deduction Plans (including Individual Retirement Plans),
(ii) the MSDW Advisors mutual fund asset allocation program and (iii) fee-based
programs approved by the Distributor, pursuant to which participants pay an
asset based fee for services in the nature of investment advisory or
administrative services, the Fund, in its discretion, may accept investments
without regard to any minimum amounts which would otherwise be required,
provided, in the case of Systematic Payroll Deduction Plans, that the
Distributor has reason to believe that additional investments will increase the
investment in all accounts under such Plans to at least $1,000. Certificates
for shares purchased will not be issued unless requested by the shareholder in
writing to the Transfer Agent.

      Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is, payment is due on the third business
day (settlement date) after the order is placed with the Distributor. 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. Sales personnel of a Selected Broker-Dealer are compensated for
selling shares of the Fund by the Distributor or any of its affiliates and/or
the Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer will receive various types of non-cash compensation as special
sales incentives, including trips, educational and/or business seminars and
merchandise. The Fund and the Distributor reserve the right to reject any
purchase orders.


ALTERNATIVE PURCHASE ARRANGEMENTS

The Fund offers several Classes of shares to investors designed to provide them
with the flexibility of selecting an investment best suited to their needs. The
general public is offered three Classes of shares: Class A shares, Class B
shares and Class C shares, which differ principally in terms of sales charges
and rate of expenses to which they are subject. A fourth Class of shares, Class
D shares, is offered only to limited categories of investors (see "No Load
Alternative--Class D Shares" below).

Each Class A, Class B, Class C or Class D share of the Fund represents an
identical interest in the investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder service
fees, Class B and Class C shares bear the expenses of the ongoing distribution
fees and Class A, Class B and Class C shares which are redeemed subject to a
CDSC bear the expense of the additional incremental distribution costs
resulting from the CDSC applicable to shares of those Classes. The ongoing
distribution fees that are imposed on Class A, Class B and Class C shares will
be imposed directly against those Classes and not against all assets of the
Fund and, accordingly, such charges against one Class will not affect the net
asset value of any other Class or have any impact on investors

14

<PAGE>

choosing another sales charge option. See "Plan of Distribution" and
"Redemptions and Repurchases."

      Set forth below is a summary of the differences between the Classes and
the factors an investor should consider when selecting a particular Class. This
summary is qualified in its entirety by detailed discussion of each Class that
follows this summary.

CLASS A SHARES. Class A shares are sold at net asset value plus an initial
sales charge of up to 5.25%. The initial sales charge is reduced for certain
purchases. Investments of $1 million or more (and investments by certain other
limited categories of investors) are not subject to any sales charges at the
time of purchase but are subject to a CDSC of 1.0% on redemptions made within
one year after purchase, except for certain specific circumstances. Class A
shares are also subject to a 12b-1 fee of up to 0.25% of the average daily net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."

CLASS B SHARES. Class B shares are offered at net asset value with no initial
sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%) if
redeemed within six years of purchase. (Class B shares purchased by certain
qualified plans are subject to a CDSC scaled down from 2.0% to 1.0% if redeemed
within three years after purchase.) This CDSC may be waived for certain
redemptions. Class B shares are also subject to an annual 12b-1 fee of 1.0% of
the lesser of: (a) the average daily aggregate gross sales of the Fund's Class
B shares since the inception of the Fund (not including reinvestments of
dividends or capital gains distributions), less the average daily aggregate net
asset value of the Fund's Class B shares redeemed since the Fund's inception
upon which a CDSC has been imposed or waived, or (b) the average daily net
assets of Class B. The Class B shares' distribution fee will cause that Class
to have higher expenses and pay lower dividends than Class A or Class D shares.
 
      After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative--Class B Shares."

CLASS C SHARES. Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on redemptions made within one
year after purchase. This CDSC may be waived for certain redemptions. They are
subject to an annual 12b-1 fee of up to 1.0% of the average daily net assets of
the Class C shares. The Class C shares' distribution fee may cause that Class
to have higher expenses and pay lower dividends than Class A or Class D shares.
See "Level Load Alternative--Class C Shares."

CLASS D SHARES. Class D shares are available only to limited categories of
investors (see "No Load Alternative--Class D Shares" below). Class D shares are
sold at net asset value with no initial sales charge or CDSC. They are not
subject to any 12b-1 fees. See "No Load Alternative--Class D Shares."

SELECTING A PARTICULAR CLASS. In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:

      The decision as to which Class of shares is more beneficial to an
investor depends on the amount and intended length of his or her investment.
Investors who prefer an initial sales charge alternative may elect to purchase
Class A shares. Investors qualifying for significantly reduced or, in the case
of purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire purchase price is
immediately invested in the Fund. Any investment return on these additional
investment amounts may partially or wholly offset the higher annual expenses of
these Classes. Because theFund's future return cannot be predicted, however,
there can be no assurance that this would be the case.

      Finally, investors should consider the effect of the CDSC period and any
conversion rights of the Classes in the context of their own investment time
frame. For example, although Class C shares are subject to a significantly
lower CDSC upon redemptions, they do not, unlike Class B shares, convert into
Class A shares after approximately ten years, and, therefore, are subject to an
ongoing 12b-1 fee of 1.0% (rather than the 0.25% fee applicable to Class A
shares) for an indefinite period of time. Thus, Class B shares may be more
attractive than Class C shares to investors with longer term investment
outlooks. Other investors, however, may elect to purchase Class C shares if,
for example, they determine that they do not wish to be subject to a front-end
sales charge and they are uncertain as to the length of time they intend to
hold their shares.

      For the purpose of meeting the $5 million (or $25 million) minimum
investment amount for Class D shares, holdings of Class A and Class D shares in
all Morgan Stanley Dean Witter Multi-Class Funds, shares of

                                                                              15
<PAGE>

FSC Funds and shares of Morgan Stanley Dean Witter Funds for which such shares
have been exchanged will be included together with the current investment
amount.

      Sales personnel may receive different compensation for selling each Class
of shares. Investors should understand that the purpose of a CDSC is the same
as that of the initial sales charge in that the sales charges applicable to
each Class provide for the financing of the distribution of shares of that
Class.

      Set forth below is a chart comparing the sales charge, 12b-1 fees and
conversion options applicable to each Class of shares:

- -----------------------------------------------------------------------------
                                                           CONVERSION 
   CLASS          SALES CHARGE          12b-1 FEE           FEATURE 
- -----------------------------------------------------------------------------
     A        Maximum 5.25%               0.25%                No 
              initial sales charge 
              reduced for 
              purchases of 
              $25,000 and over; 
              shares sold without 
              an initial sales 
              charge generally 
              subject to a 1.0% 
              CDSC during first 
              year.                       
- -----------------------------------------------------------------------------
     B        Maximum 5.0%                 1.0%          B shares convert 
              CDSC during the first                      to A shares 
              year decreasing                            automatically after 
              to 0 after six years                       approximately 
                                                         ten years 
- -----------------------------------------------------------------------------
     C        1.0% CDSC during             1.0%                No  
              first year      
- -----------------------------------------------------------------------------
     D               None                  None                No 
- -----------------------------------------------------------------------------

      See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for
other differences between the Classes of shares.


INITIAL SALES CHARGE ALTERNATIVE--
CLASS A SHARES

Class A shares are sold at net asset value plus an initial sales charge. In
some cases, reduced sales charges may be available, as described below.
Investments of $1 million or more (and investments by certain other limited
categories of investors) are not subject to any sales charges at the time of
purchase but are subject to a CDSC of 1.0% on redemptions made within one year
after purchase (calculated from the last day of the month in which the shares
were purchased), except for certain specific circumstances. The CDSC will be
assessed on an amount equal to the lesser of the current market value or the
cost of the shares being redeemed. The CDSC will not be imposed (i) in the
circumstances set forth below in the section "Contingent Deferred Sales Charge
Alternative--Class B Shares--CDSC Waivers," except that the references to six
years in the first paragraph of that section shall mean one year in the case of
Class A shares, and (ii) in the circumstances identified in the section
"Additional Net Asset Value Purchase Options" below. Class A shares are also
subject to an annual 12b-1 fee of up to 0.25% of the average daily net assets
of the Class.

      The offering price of Class A shares will be the net asset value per
share next determined following receipt of an order (see "Determination of Net
Asset Value" below), plus a sales charge (expressed as a percentage of the
offering price) on a single transaction as shown in the following table:
<PAGE>
<TABLE>
<CAPTION>
                                            Sales Charge
                                            ------------
                                  Percentage of        Approximate
       Amount of Single          Public Offering      Percentage of
         Transaction                  Price          Amount Invested
         -----------                  -----          ---------------
<S>                                  <C>                  <C>  
Less than $25,000 ...........        5.25%                5.54%
$25,000 but less
   than $50,000 .............        4.75%                4.99%
$50,000 but less
   than $100,000 ............        4.00%                4.17%
$100,000 but less
   than $250,000 ............        3.00%                3.09%
$250,000 but less
   than $1 million ..........        2.00%                2.04%
$1 million and over .........           0                    0
</TABLE>

      Upon notice to all Selected Broker-Dealers, the Distributor may reallow
up to the full applicable sales charge as shown in the above schedule during
periods specified in such notice. During periods when 90% or more of the sales
charge is reallowed, such Selected Broker-Dealers may be deemed to be
underwriters as that term is defined in the Securities Act of 1933.

      The above schedule of sales charges is applicable to purchases in a
single transaction by, among others: (a) an individual; (b) an individual, his
or her spouse and their children under the age of 21 purchasing shares for his,
her or their own accounts; (c) a trustee or other fiduciary purchasing shares
for a single trust estate or a single fiduciary account; (d) a pension,
profit-sharing or other employee benefit plan qualified or non-qualified under
Section 401 of the Internal Revenue Code; (e) tax-exempt organizations
enumerated in Section 501(c)(3) or (13) of the Internal Revenue Code; (f)
employee benefit plans qualified under Section 401 of the Internal Revenue Code
of a single employer or of employers who are "affiliated persons" of each other
within the meaning of Section 2(a)(3)(c) of the Act; and for investments in
Individual Retirement Accounts of employees of a single employer

16
<PAGE>

through Systematic Payroll Deduction plans; or (g) any other organized group of
persons, whether incorporated or not, provided the organization has been in
existence for at least six months and has some purpose other than the purchase
of redeemable securities of a registered investment company at a discount.

COMBINED PURCHASE PRIVILEGE. Investors may have the benefit of reduced sales
charges in accordance with the above schedule by combining purchases of Class A
shares of the Fund in single transactions with the purchase of Class A shares
of other Morgan Stanley Dean Witter Multi-Class Funds and shares of FSC Funds.
The sales charge payable on the purchase of the Class A shares of the Fund, the
Class A shares of the other Morgan Stanley Dean Witter Multi-Class Funds and
the shares of the FSC Funds will be at their respective rates applicable to the
total amount of the combined concurrent purchases of such shares.

RIGHT OF ACCUMULATION. The above persons and entities may benefit from a
reduction of the sales charges in accordance with the above schedule if the
cumulative net asset value of Class A shares purchased in a single transaction,
together with shares of the Fund and other Morgan Stanley Dean Witter Funds
previously purchased at a price including a front-end sales charge (including
shares of the Fund and other Morgan Stanley Dean Witter Funds acquired in
exchange for those shares, and including in each case shares acquired through
reinvestment of dividends and distributions), which are held at the time of
such transaction, amounts to $25,000 or more. If such investor has a cumulative
net asset value of shares of FSC Funds and Class A and Class D shares that,
together with the current investment amount, is equal to at least $5 million
($25 million for certain qualified plans), such investor is eligible to
purchase Class D shares subject to the $1,000 minimum initial investment
requirement of that Class of the Fund. See "No Load Alternative--Class D
Shares" below.

      The Distributor must be notified by DWR or a Selected Broker-Dealer or
the shareholder at the time a purchase order is placed that the purchase
qualifies for the reduced charge under the Right of Accumulation. Similar
notification must be made in writing by the dealer or shareholder when such an
order is placed by mail. The reduced sales charge will not be granted if: (a)
such notification is not furnished at the time of the order; or (b) a review of
the records of the Selected Broker-Dealer or the Transfer Agent fails to
confirm the investor's represented holdings.

LETTER OF INTENT. The foregoing schedule of reduced sales charges will also be
available to investors who enter into a written Letter of Intent providing for
the purchase, within a thirteen-month period, of Class A shares of the Fund
from DWR or other Selected Broker-Dealers. The cost of Class A shares of the
Fund or shares of other Morgan Stanley Dean Witter Funds which were previously
purchased at a price including a front-end sales charge during the 90-day
period prior to the date of receipt by the Distributor of the Letter of Intent,
or of Class A shares of the Fund or shares of other Morgan Stanley Dean Witter
Funds acquired in exchange for shares of such funds purchased during such
period at a price including a front-end sales charge, which are still owned by
the shareholder, may also be included in determining the applicable reduction.

ADDITIONAL NET ASSET VALUE PURCHASE OPTIONS. In addition to investments of $1
million or more, Class A shares also may be purchased at net asset value by the
following:

      (1) trusts for which MSDW Trust (which is an affiliate of the Investment
Manager) provides discretionary trustee services;

      (2) persons participating in a fee-based program approved by the
Distributor, pursuant to which such persons pay an asset based fee for services
in the nature of investment advisory, administrative and/or brokerage services
(such investments are subject to all of the terms and conditions of such
programs, which may include termination fees, mandatory redemption upon
termination and such other circumstances as specified in the programs'
agreements, and restrictions on transferability of Fund shares);

      (3) employer-sponsored 401(k) and other plans qualified under Section
401(a) of the Internal Revenue Code ("Qualified Retirement Plans") with at
least 200 eligible employees and for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement;

      (4) Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement whose Class B shares have converted to Class A
shares, regardless of the plan's asset size or number of eligible employees;

      (5) investors who are clients of a Morgan Stanley Dean Witter Financial
Advisor who joined Morgan Stanley Dean Witter from another investment firm
within six months prior to the date of purchase of Fund shares by such
investors, if the shares are being purchased with the proceeds from a
redemption of shares of an open-end proprietary mutual fund of the Financial
Advisor's

                                                                              17
<PAGE>

previous firm which imposed either a front-end or deferred sales charge,
provided such purchase was made within sixty days after the redemption and the
proceeds of the redemption had been maintained in the interim in cash or a
money market fund; and

      (6) other categories of investors, at the discretion of the Board, as
disclosed in the then current prospectus of the Fund.

      No CDSC will be imposed on redemptions of shares purchased pursuant to
paragraphs (1), (2) or (5), above.

      For further information concerning purchases of the Fund's shares,
contact DWR or another Selected Broker-Dealer or consult the Statement of
Additional Information.


CONTINGENT DEFERRED SALES CHARGE
ALTERNATIVE--CLASS B SHARES

Class B shares are sold at net asset value next determined without an initial
sales charge so that the full amount of an investor's purchase payment may be
immediately invested in the Fund. A CDSC, however, will be imposed on most
Class B shares redeemed within six years after purchase. The CDSC will be
imposed on any redemption of shares if after such redemption the aggregate
current value of a Class B account with the Fund falls below the aggregate
amount of the investor's purchase payments for Class B shares made during the
six years (or, in the case of shares held by certain Qualified Retirement
Plans, three years) preceding the redemption. In addition, Class B shares are
subject to an annual 12b-1 fee of 1.0% of the lesser of: (a) the average daily
aggregate gross sales of the Fund's Class B shares since the inception of the
Fund (not including reinvestments of dividends or capital gains distributions),
less the average daily aggregate net asset value of the Fund's Class B shares
redeemed since the Fund's inception upon which a CDSC has been imposed or
waived, or (b) the average daily net assets of Class B.

      Except as noted below, Class B shares of the Fund which are held for six
years or more after purchase (calculated from the last day of the month in
which the shares were purchased) will not be subject to any CDSC upon
redemption. Shares redeemed earlier than six years after purchase may, however,
be subject to a CDSC which will be a percentage of the dollar amount of shares
redeemed and will be assessed on an amount equal to the lesser of the current
market value or the cost of the shares being redeemed. The size of this
percentage will depend upon how long the shares have been held, as set forth in
the following table:

<TABLE>
<CAPTION>
           Year Since
            Purchase                CDSC as a Percentage
          Payment Made               of Amount Redeemed
          ------------               ------------------
<S>                                        <C> 
First ..........................           5.0%
Second .........................           4.0%
Third ..........................           3.0%
Fourth .........................           2.0%
Fifth ..........................           2.0%
Sixth ..........................           1.0%
Seventh and thereafter .........           None
</TABLE>

      In the case of Class B shares of the Fund purchased on or after July 28,
1997 by Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement, shares held for three years or more after
purchase (calculated as described in the paragraph above) will not be subject
to any CDSC upon redemption. However, shares redeemed earlier than three years
after purchase may be subject to a CDSC (calculated as described in the
paragraph above), the percentage of which will depend on how long the shares
have been held, as set forth in the following table:
<PAGE>
<TABLE>
<CAPTION>
           Year Since
            Purchase               CDSC as a Percentage
          Payment Made              of Amount Redeemed
          ------------              ------------------
<S>                                       <C> 
First .........................           2.0%
Second ........................           2.0%
Third .........................           1.0%
Fourth and thereafter .........           None
</TABLE>

CDSC WAIVERS. A CDSC will not be imposed on: (i) any amount which represents an
increase in value of shares purchased within the six years (or, in the case of
shares held by certain Qualified Retirement Plans, three years) preceding the
redemption; (ii) the current net asset value of shares purchased more than six
years (or, in the case of shares held by certain Qualified Retirement Plans,
three years) prior to the redemption; and (iii) the current net asset value of
shares purchased through reinvestment of dividends or distributions and/or
shares acquired in exchange for shares of FSC Funds or of other Morgan Stanley
Dean Witter Funds acquired in exchange for such shares. Moreover, in
determining whether a CDSC is applicable it will be assumed that amounts
described in (i), (ii) and (iii) above (in that order) are redeemed first. In
addition, 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:

18
<PAGE>

(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;

      (3) all redemptions of shares held for the benefit of a participant in a
Qualified Retirement Plan which offers investment companies managed by the
Investment Manager or its subsidiary, MSDW Services, as self-directed
investment alternatives and for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement ("Eligible Plan"), provided that either: (A)
the plan continues to be an Eligible Plan after the redemption; or (B) the
redemption is in connection with the complete termination of the plan involving
the distribution of all plan assets to participants; and

      (4) certain redemptions pursuant to the Fund's Systematic Withdrawal Plan
(see "Shareholder Services--Systematic Withdrawal Plan").

      With reference to (1) above, for the purpose of determining disability,
the Distributor utilizes the definition of disability contained in Section
72(m)(7) of the Internal Revenue Code, which relates to the inability to engage
in gainful employment. With reference to (2) above, the term "distribution"
does not encompass a direct transfer of IRA, 403(b) Custodial Account or
retirement plan assets to a successor custodian or trustee. All waivers will be
granted only following receipt by the Distributor of confirmation of the
shareholder's entitlement.

CONVERSION TO CLASS A SHARES. All shares of the Fund held prior to July 28,
1997 have been designated Class B shares. Shares held before May 1, 1997 will
convert to Class A shares in May, 2007. In all other instances Class B shares
will convert automatically to Class A shares, based on the relative net asset
values of the shares of the two Classes on the conversion date, which will be
approximately ten (10) years after the date of the original purchase. The ten
year period is calculated from the last day of the month in which the shares
were purchased or, in the case of Class B shares acquired through an exchange
or a series of exchanges, from the last day of the month in which the original
Class B shares were purchased, provided that shares originally purchased before
May 1, 1997 will convert to Class A shares in May, 2007. The conversion of
shares purchased on or after May 1, 1997 will take place in the month following
the tenth anniversary of the purchase. There will also be converted at that
time such proportion of Class B shares acquired through automatic reinvestment
of dividends and distributions owned by the shareholder as the total number of
his or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a Qualified Retirement Plan for which MSDW Trust
serves as Trustee or DWR's Retirement Plan Services serves as recordkeeper
pursuant to a written Recordkeeping Services Agreement, the plan is treated as
a single investor and all Class B shares will convert to Class A shares on the
conversion date of the first shares of a Morgan Stanley Dean Witter Multi-Class
Fund purchased by that plan. In the case of Class B shares previously exchanged
for shares of an "Exchange Fund" (see "Shareholder Services--Exchange
Privilege"), the period of time the shares were held in the Exchange Fund
(calculated from the last day of the month in which the Exchange Fund shares
were acquired) is excluded from the holding period for conversion. If those
shares are subsequently re-exchanged for Class B shares of a Morgan Stanley
Dean Witter Multi-Class Fund, the holding period resumes on the last day of the
month in which Class B shares are reacquired.

      If a shareholder has received share certificates for Class B shares, such
certificates must be delivered to the Transfer Agent at least one week prior to
the date for conversion. Class B shares evidenced by share certificates that
are not received by the Transfer Agent at least one week prior to any
conversion date will be converted into Class A shares on the next scheduled
conversion date after such certificates are received.

      Effectiveness of the conversion feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel that (i) the conversion of shares does not constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion
will have a basis equal to the shareholder's basis in the converted Class B
shares immediately prior to the conversion, and (iii) Class A shares received
on conversion will have a holding period that includes the holding period of
the converted Class B

                                                                              19
<PAGE>

shares. The conversion feature may be suspended if the ruling or opinion is no
longer available. In such event, Class B shares would continue to be subject to
Class B 12b-1 fees.

LEVEL LOAD ALTERNATIVE--CLASS C SHARES

Class C shares are sold at net asset value next determined without an initial
sales charge but are subject to a CDSC of 1.0% on most redemptions made within
one year after purchase (calculated from the last day of the month in which the
shares were purchased). The CDSC will be assessed on an amount equal to the
lesser of the current market value or the cost of the shares being redeemed.
The CDSC will not be imposed in the circumstances set forth above in the
section "Contingent Deferred Sales Charge Alternative--Class B Shares--CDSC
Waivers," except that the references to six years in the first paragraph of
that section shall mean one year in the case of Class C shares. Class C shares
are subject to an annual 12b-1 fee of up to 1.0% of the average daily net
assets of the Class. Unlike Class B shares, Class C shares have no conversion
feature and, accordingly, an investor that purchases Class C shares will be
subject to 12b-1 fees applicable to Class C shares for an indefinite period
subject to annual approval by the Fund's Board of Trustees and regulatory
limitations.

NO LOAD ALTERNATIVE--CLASS D SHARES

Class D shares are offered without any sales charge on purchase or redemption
and without any 12b-1 fee. Class D shares are offered only to investors meeting
an initial investment minimum of $5 million ($25 million for Qualified
Retirement Plans for which MSDW Trust serves as Trustee or DWR's Retirement
Plan Services serves as recordkeeper pursuant to a written Recordkeeping
Services Agreement) and the following categories of investors: (i) investors
participating in the MSDW Advisors mutual fund asset allocation program
pursuant to which such persons pay an asset based fee; (ii) persons
participating in a fee-based program approved by the Distributor, pursuant to
which such persons pay an asset based fee for services in the nature of
investment advisory, administrative and/or brokerage services (subject to all
of the terms and conditions of such programs referred to in (i) and (ii) above,
which may include termination fees, mandatory redemption upon termination and
such other circumstances as specified in the programs' agreements, and
restrictions on transferability of Fund shares); (iii) employee benefit plans
maintained by Morgan Stanley Dean Witter & Co. or any of its subsidiaries for
the benefit of certain employees of Morgan Stanley Dean Witter & Co. and its
subsidiaries; (iv) certain Unit Investment Trusts sponsored by DWR; (v) certain
other open-end investment companies whose shares are distributed by the
Distributor; (vi) investors who were shareholders of Dean Witter Retirement
Series on September 11, 1998 (with respect to additional purchases for their
former Dean Witter Retirement Series accounts); and (vii) other categories of
investors, at the discretion of the Board, as disclosed in the then current
prospectus of the Fund. Investors who require a $5 million (or $25 million)
minimum initial investment to qualify to purchase Class D shares may satisfy
that requirement by investing that amount in a single transaction in Class D
shares of the Fund and other Morgan Stanley Dean Witter Multi-Class Funds,
subject to the $1,000 minimum initial investment required for that Class of the
Fund. In addition, for the purpose of meeting the $5 million (or $25 million)
minimum investment amount, holdings of Class A and Class D shares in all Morgan
Stanley Dean Witter Multi-Class Funds, shares of FSC Funds and shares of Morgan
Stanley Dean Witter Funds for which such shares have been exchanged will be
included together with the current investment amount. If a shareholder redeems
Class A shares and purchases Class D shares, such redemption may be a taxable
event.

PLAN OF DISTRIBUTION

The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act with respect to the distribution of Class A, Class B and Class C shares of
the Fund. In the case of Class A and Class C shares, the Plan provides that the
Fund will reimburse the Distributor and others for the expenses of certain
activities and services incurred by them specifically on behalf of those
shares. Reimbursements for these expenses will be made in monthly payments by
the Fund to the Distributor, which will in no event exceed amounts equal to
payments at the annual rates of 0.25% and 1.0% of the average daily net assets
of Class A and Class C, respectively. In the case of Class B shares, the Plan
provides that the Fund will pay the Distributor a fee, which is accrued daily
and paid monthly, at the annual rate of 1.0% of the lesser of: (a) the average
daily aggregate gross sales of the Fund's Class B shares since the inception of
the Fund (not including reinvestments of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the Fund's inception upon which a CDSC has been
imposed or waived, or (b) the average daily net assets of Class B. The fee is
treated by the Fund as an expense in the year it is accrued. In the case of
Class A shares, the entire amount of the fee currently represents a service fee
within the meaning of the NASD guidelines. In the case of Class B and Class C

20
<PAGE>

shares, a portion of the fee payable pursuant to the Plan, equal to 0.25% of
the average daily net assets of each of these Classes, is currently
characterized as a service fee. A service fee is a payment made for personal
service and/or the maintenance of shareholder accounts.

      Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of Morgan Stanley Dean
Witter Financial Advisors and others who engage in or support distribution of
shares or who service shareholder accounts, including overhead and telephone
expenses; printing and distribution of prospectuses and reports used in
connection with the offering of the Fund's shares to other than current
shareholders; and preparation, printing and distribution of sales literature
and advertising materials. In addition, the Distributor may utilize fees paid
pursuant to the Plan in the case of Class B shares to compensate DWR and other
Selected Broker-Dealers for their opportunity costs in advancing such amounts,
which compensation would be in the form of a carrying charge on any
unreimbursed expenses.

      For the fiscal year ended September 30, 1998, Class B shares of the Fund
accrued payments under the Plan amounting to $7,916,623, which amount is equal
to 1.0% of the average daily net assets of Class B for the fiscal year. These
payments were calculated pursuant to clause (b) of the compensation formula
under the Plan. For the fiscal year ended September 30, 1998, Class A and Class
C shares of the Fund accrued payments under the Plan amounting to $10,097 and
$21,641, respectively, which amounts are equal to 0.25% and 1.0% of the average
daily net assets of Class A and Class C, respectively, for the fiscal year.

      In the case of Class B shares, at any given time, the expenses of
distributing Class B shares of the Fund may be in excess of the total of (i)
the payments made by the Fund pursuant to the Plan and (ii) the proceeds of
CDSCs paid by investors upon redemption of Class B shares. For example, if $1
million in expenses in distributing Class B shares of the Fund had been
incurred and $750,000 had been received as described in (i) and (ii) above, the
excess expense would amount to $250,000. The Distributor has advised the Fund
that such excess amounts, including the carrying charge described above,
totalled $24,581,350 at September 30, 1998, which was equal to 4.12% of the net
assets of Class B on such date. Because there is no requirement under the Plan
that the Distributor be reimbursed for all distribution expenses or any
requirement that the Plan be continued from year to year, 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 CDSCs paid by investors upon
redemption of shares, if for any reason the Plan is terminated the Trustees
will consider at that time the manner in which to treat such expenses. Any
cumulative expenses incurred, but not yet recovered through distribution fees
or CDSCs, may or may not be recovered through future distribution fees or
CDSCs.

      In the case of Class A and Class C shares, expenses incurred pursuant to
the Plan in any calendar year in excess of 0.25% or 1.0% of the average daily
net assets of Class A or Class C, respectively, will not be reimbursed by the
Fund through payments in any subsequent year, except that expenses representing
a gross sales commission credited to Morgan Stanley Dean Witter Financial
Advisors and other Selected Broker-Dealer representatives at the time of sale
may be reimbursed in the subsequent calendar year. The Distributor has advised
the Fund that unreimbursed expenses representing a gross sales commission
credited to Morgan Stanley Dean Witter Financial Advisors and other Selected
Broker-Dealer representatives at the time of sale totalled $14,710 in the case
of Class C at December 31, 1997, which amount was equal to 0.72% of the net
assets of Class C on such date, and that there were no such expenses that may
be reimbursed in the subsequent year in the case of Class A on such date. No
interest or other financing charges will be incurred on any Class A or Class C
distribution expenses incurred by the Distributor under the Plan or on any
unreimbursed expenses due to the Distributor pursuant to the Plan.


DETERMINATION OF NET ASSET VALUE

The net asset value per share is determined once daily at 4:00 p.m., New York
time (or, on days when the New York Stock Exchange closes prior to 4:00 p.m.,
at such earlier time), on each day that the New York Stock Exchange is open by
taking the net assets of the Fund, dividing by the number of shares outstanding
and adjusting to the nearest cent. The assets belonging to the Class A, Class
B, Class C and Class D shares will be invested together in a single portfolio.
The net asset value of each Class, however, will be determined separately by
subtracting each Class's accrued expenses and liabilities. The net asset value
per share will not be determined on Good Friday and on such other federal and
non-federal holidays as are observed by the New York Stock Exchange.

      In the calculation of the Fund's net asset value: (1) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
domestic or foreign

                                                                              21
<PAGE>

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, 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 Board of Trustees (valuation of debt securities for which market
quotations are not readily available may be based upon current market prices of
securities which are comparable in coupon, rating and maturity or an
appropriate matrix utilizing similar factors).

      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 securitieswill 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 applicable Class of the Fund (or, if specified by the
shareholder, in shares of any other open-end Morgan Stanley Dean Witter Fund),
unless the shareholder requests that they be paid in cash. Shares so acquired
are acquired at net asset value and are not subject to the imposition of a
front-end sales charge or a CDSC (see "Redemptions and Repurchases").

EASYINVEST.SM Shareholders may subscribe to EasyInvest, an automatic purchase
plan which provides for any amount from $100 to $5,000 to be transferred
automatically from a checking or savings account or following redemption of
shares of a Morgan Stanley Dean Witter money market fund, on a semi-monthly,
monthly or quarterly basis, to the Transfer Agent for investment in shares of
the Fund (see "Purchase of Fund Shares" and "Redemptions and
Repurchases--Involuntary Redemption").

INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH. Any shareholder who
receives a cash payment representing a dividend or capital gains distribution
may invest such dividend or distribution in shares of the applicable Class at
the net asset value per share next determined after receipt by the Transfer
Agent, by returning the check or the proceeds to the Transfer Agent within
thirty days after the payment date. Shares so acquired are acquired at net
asset value and are not subject to the imposition of a front-end sales charge
or a CDSC (see "Redemptions and Repurchases").

SYSTEMATIC WITHDRAWAL PLAN. A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders whose shares of Morgan Stanley Dean Witter
Funds have an aggregate value of $10,000 or more. Shares of any Fund from which
redemptions will be made pursuant to the Plan must have a value of $1,000 or
more (referred to as a "SWP Fund"). The required share values are determined on
the date the shareholder establishes the Withdrawal Plan. The Withdrawal Plan
provides for monthly, quarterly, semi-annual or annual payments in any amount
not less than $25, or in any whole percentage of the value of the SWP Funds'
shares, on an annualized basis. Any applicable CDSC will be imposed on shares
redeemed under the Withdrawal Plan (see "Purchase of Fund Shares"), except that
the CDSC, if any, will be waived on redemptions under the Withdrawal Plan of up
to 12% annually of the value of each SWP Fund account, based on the share
values next determined after the shareholder establishes the Withdrawal Plan.
Redemptions for which this CDSC waiver policy applies may be in amounts up to
1% per month, 3% per quarter, 6% semi-annually or 12% annually. Under this CDSC
waiver policy, amounts withdrawn each period will be paid by first redeeming
shares not subject to a CDSC because the shares were purchased by the
reinvestment of dividends or capital gains distributions, the CDSC period has
elapsed or some other waiver of the CDSC applies. If shares subject to a CDSC
must be redeemed, shares held for the longest period of time will be redeemed
first and continuing with shares held the next longest period of time until
shares held the shortest period of time are redeemed. Any shareholder
participating in the Withdrawal Plan will have sufficient shares redeemed from
his or her account so that the proceeds (net of any applicable CDSC) to the
shareholder will be the designated monthly, quarterly, semi-annual or annual
amount.

22
<PAGE>

      A shareholder may suspend or terminate participation in the Withdrawal
Plan at any time. A shareholder who has suspended participation may resume
payments under the Withdrawal Plan, without requiring a new determination of
the account value for the 12% CDSC waiver. The Withdrawal Plan may be
terminated or revised at any time by the Fund.

      Prior to adding an additional SWP Fund to an existing Withdrawal Plan,
the required $10,000/$1,000 share values must be met, to be calculated on the
date the shareholder adds the additional SWP Fund. However, the addition of a
new SWP Fund will not change the account value for the 12% CDSC waiver for the
SWP Funds already participating in the Withdrawal Plan.

      Withdrawal Plan payments should not be considered dividends, yields or
income. If periodic Withdrawal Plan payments continuously exceed net investment
income and net capital gains, the shareholder's original investment will be
correspondingly reduced and ultimately exhausted. Each withdrawal constitutes a
redemption of shares and any gain or loss realized must be recognized for
federal income tax purposes.

      Shareholders should contact their Morgan Stanley Dean Witter Financial
Advisor or other Selected Broker-Dealer representative or the Transfer Agent
for further information about any of the above services.

TAX SHELTERED RETIREMENT PLANS. Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax advisor.

      For further information regarding plan administration, custodial fees and
other details, investors should contact their Morgan Stanley Dean Witter
Financial Advisor or other Selected Broker-Dealer representative or the
Transfer Agent.


EXCHANGE PRIVILEGE

Shares of each Class may be exchanged for shares of the same Class of any other
Morgan Stanley Dean Witter Multi-Class Fund without the imposition of any
exchange fee. Shares may also be exchanged for shares of the following funds:
Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust, Morgan Stanley Dean
Witter Limited Term Municipal Trust, Morgan Stanley Dean Witter Short-Term Bond
Fund and five Morgan Stanley Dean Witter Funds which are money market funds
(the "Exchange Funds"). Class A shares may also be exchanged for shares of
Morgan Stanley Dean Witter Multi-State Municipal Series Trust and Morgan
Stanley Dean Witter Hawaii Municipal Trust, which are Morgan Stanley Dean
Witter Funds sold with a front-end sales charge ("FSC 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 Morgan Stanley Dean Witter Multi-Class Fund, any
FSC Fund or any Exchange Fund that is not a money market fund is on the basis
of the next calculated net asset value per share of each fund after the
exchange order is received. When exchanging into a money market fund from the
Fund, shares of the Fund are redeemed out of the Fund at their next calculated
net asset value and the proceeds of the redemption are used to purchase shares
of the money market fund at their net asset value determined the following
business day. Subsequent exchanges between any of the money market funds and
any of the Morgan Stanley Dean Witter Multi-Class Funds, FSC Funds or any
Exchange Fund that is not a money market fund can be effected on the same
basis.

      No CDSC is imposed at the time of any exchange of shares, although any
applicable CDSC will be imposed upon ultimate redemption. During the period of
time the shareholder remains in an Exchange Fund (calculated from the last day
of the month in which the Exchange Fund shares were acquired), the holding
period (for the purpose of determining the rate of the CDSC) is frozen. If
those shares are subsequently re-exchanged for shares of a Morgan Stanley Dean
Witter Multi-Class Fund, the holding period previously frozen when the first
exchange was made resumes on the last day of the month in which shares of a
Morgan Stanley Dean Witter Multi-Class Fund are reacquired. Thus, the CDSC is
based upon the time (calculated as described above) the shareholder was
invested in shares of a Morgan Stanley Dean Witter Multi-Class Fund (see
"Purchase of Fund Shares"). In the case of exchanges of Class A shares which
are subject to a CDSC, the holding period also includes the time (calculated as
described above) the shareholder was invested in shares of a FSC Fund. In the
case of shares exchanged into an Exchange Fund on or after April 23, 1990, upon
a redemption of shares which results in a CDSC being imposed, a credit (not to
exceed the amount of the CDSC) will be given in an amount equal to the Exchange
Fund 12b-1 distribution fees incurred on or after that date which are
attributable to those shares. (Exchange Fund 12b-1 distribution fees are
described in the prospectuses for those funds.) Class B shares of the Fund
acquired in exchange for Class B shares of another Morgan Stanley

                                                                              23
<PAGE>

Dean Witter Multi-Class Fund having a different CDSC schedule than that of this
Fund will be subject to the higher CDSC schedule, even if such shares are
subsequently re-exchanged for shares of the fund with the lower CDSC schedule.

ADDITIONAL INFORMATION REGARDING EXCHANGES. Purchases and exchanges should be
made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Investment Manager to be abusive and contrary to the best
interests of the Fund's other shareholders and, at the Investment Manager's
discretion, may be limited by the Fund's refusal to accept additional purchases
and/or exchanges from the investor. Although the Fund does not have any
specific definition of what constitutes a pattern of frequent exchanges, and
will consider all relevant factors in determining whether a particular
situation is abusive and contrary to the best interests of the Fund and its
other shareholders, investors should be aware that the Fund and each of the
other Morgan Stanley 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 Morgan Stanley
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 Morgan Stanley Dean Witter Financial Advisor or other
Selected Broker-Dealer representative regarding restrictions on exchange of
shares of the Fund pledged in the margin account.

      The current prospectus for each fund describes its investment
objective(s) and policies, and shareholders should obtain a copy and examine it
carefully before investing. Exchanges are subject to the minimum investment
requirement of each Class of shares and any other conditions imposed by each
fund. In the case of a shareholder holding a share certificate or certificates,
no exchanges may be made until all applicable share certificates have been
received by the Transfer Agent and deposited in the shareholder's account. An
exchange will be treated for federal income tax purposes the same as a
repurchase or redemption of shares, on which the shareholder may realize a
capital gain or loss. However, the ability to deduct capital losses on an
exchange may be limited in situations where there is an exchange of shares
within ninety days after the shares are purchased. The Exchange Privilege is
only available in states where an exchange may legally be made.

      If DWR or another Selected Broker-Dealer is the current dealer of record
and its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the Morgan
Stanley Dean Witter Funds (for which the Exchange Privilege is available)
pursuant to this Exchange Privilege by contacting their Morgan Stanley Dean
Witter Financial Advisor or other Selected Broker-Dealer representative (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or another Selected Broker-Dealer but
who wish to make exchanges directly by writing or telephoning the Transfer
Agent) must complete and forward to the Transfer Agent an Exchange Privilege
Authorization Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization Form is used, exchanges may be made
in writing or by contacting the Transfer Agent at (800) 869-NEWS (toll-free).

      The Fund will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. Such procedures may
include requiring various forms of personal identification such as name,
mailing address, social security or other tax identification number and DWR or
other Selected Broker-Dealer account number (if any). Telephone instructions
may also be recorded. If such procedures are not employed, the Fund may be
liable for any losses due to unauthorized or fraudulent instructions.

      Telephone exchange instructions will be accepted if received by the
Transfer Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the
New York Stock Exchange is open. Any shareholder wishing to make an exchange
who has previously filed an Exchange Privilege Authorization Form and who is
unable to reach the Fund by telephone should contact his or her Morgan Stanley
Dean Witter Financial Advisor or other Selected Broker-Dealer representative,
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 Morgan Stanley Dean Witter Funds in the past.

      Shareholders should contact their Morgan Stanley Dean Witter Financial
Advisor or other Selected Broker-Dealer representative or the Transfer Agent
for further information about the Exchange Privilege.

24
<PAGE>

REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------

REDEMPTION. Shares of each Class of the Fund can be redeemed for cash at any
time at the net asset value per share next determined less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see
"Purchase of Fund Shares"). If shares are held in a shareholder's account
without a share certificate, a written request for redemption to the Fund's
Transfer Agent at P.O. Box 983, Jersey City, NJ 07303 is required. If
certificates are held by the shareholder, the shares may be redeemed by
surrendering the certificates with a written request for redemption, along with
any additional information required by the Transfer Agent.

REPURCHASE. DWR and other Selected Broker-Dealers are authorized to repurchase
shares represented by a share certificate which is delivered to any of their
offices. Shares held in a shareholder's account without a share certificate may
also be repurchased by DWR and other Selected Broker-Dealers upon the
telephonic request of the shareholder. The repurchase price is the net asset
value next computed (see "Purchase of Fund Shares") after such purchase order
is received by DWR or other Selected Broker-Dealer, reduced by any applicable
CDSC.

      The CDSC, if any, will be the only fee imposed by the Fund or the
Distributor. The offer by DWR and other Selected Broker-Dealers to repurchase
shares may be suspended without notice by them at any time. In that event,
shareholders may redeem their shares through the Fund's Transfer Agent as set
forth above under "Redemption."

PAYMENT FOR SHARES REDEEMED OR REPURCHASED. Payment for shares presented for
repurchase or redemption will be made by check within seven days after receipt
by the Transfer Agent of the certificate and/or written request in good order.
Such payment may be postponed or the right of redemption suspended under
unusual circumstances, e.g., when normal trading is not taking place on the New
York Stock Exchange. If the shares to be redeemed have recently been purchased
by check, payment of the redemption proceeds may be delayed for the minimum
time needed to verify that the check used for investment has been honored (not
more than fifteen days from the time of receipt of the check by the Transfer
Agent). Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their Morgan Stanley Dean Witter Financial
Advisor or other Selected Broker-Dealer representative regarding restrictions
on redemption of shares of the Fund pledged in the margin account.

REINSTATEMENT PRIVILEGE. A shareholder who has had his or her shares redeemed
or repurchased and has not previously exercised this reinstatement privilege
may, within 35 days after the date of the redemption or repurchase, reinstate
any portion or all of the proceeds of such redemption or repurchase in shares
of the Fund in the same Class from which such shares were redeemed or
repurchased, at their net asset value next determined after a reinstatement
request, together with the proceeds, is received by the Transfer Agent and
receive a pro rata credit for any CDSC paid in connection with such redemption
or repurchase.

INVOLUNTARY REDEMPTION. The Fund reserves the right, on sixty days' notice, to
redeem, at their net asset value, the shares of any shareholder (other than
shares held in an Individual Retirement Account or custodial account under
Section 403(b)(7) of the Internal Revenue Code) whose shares due to redemptions
by the shareholder have a value of less than $100, or such lesser amount as may
be fixed by the Board of Trustees or, in the case of an account opened through
EasyInvestSM, if after twelve months the shareholder has invested less than
$1,000 in the account. However, before the Fund redeems such shares and sends
the proceeds to the shareholder, it will notify the shareholder that the value
of the shares is less than the applicable amount and allow the shareholder
sixty days to make an additional investment in an amount which will increase
the value of his or her account to at least the applicable amount before the
redemption is processed. No CDSC will be imposed on any involuntary redemption.
 

DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------

DIVIDENDS AND DISTRIBUTIONS. The Fund declares dividends separately for each
Class of shares and intends to distribute substantially all of its net
investment income and net realized short-term and long-term capital gains, if
any, at least once each year. The Fund may, however, determine to retain all or
part of any net long-term capital gains in any year for reinvestment.

      All dividends and any capital gains distributions will be paid in
additional shares of the same Class and automatically credited to the
shareholder's account without issuance of a share certificate unless the
shareholder requests in writing that all dividends and/or distributions be paid
in cash. Shares acquired by dividend and distribution reinvestments will not be
subject to any front-end

                                                                              25
<PAGE>

sales charge or CDSC. Class B shares acquired through dividend and distribution
reinvestments will become eligible for conversion to Class A shares on a pro
rata basis. Distributions paid on Class A and Class D shares will be higher
than for Class B and Class C shares because distribution fees paid by Class B
and Class C shares are higher. (See "Shareholder Services--Automatic Investment
of Dividends and Distributions.")

TAXES. Because the Fund intends to distribute all of its net investment income
and net capital gains (to the extent not offset by capital loss carryovers) to
shareholders and 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. Shareholders who are required
to pay taxes on their income will normally have to pay federal income taxes,
and any state and local income taxes, on any dividends and distributions they
receive from the Fund. Such dividends and distributions, to the extent they are
derived from net investment income and net short-term capital gains, are
taxable to the shareholder as ordinary dividend income regardless of whether
the shareholder receives such payments in additional shares or in cash. All
dividends declared in the last quarter of any calendar year which are paid in
the following year prior to February 1 will be deemed, for tax purposes, to
have been received by the shareholder in the prior year.

      Distributions of net long-term capital gains, if any, are taxable to
shareholders as long-term capital gains regardless of how long a shareholder
has held the Fund's shares and regardless of whether the distribution is
received in additional shares or in cash. Capital gains distributions are not
eligible for the corporate dividends received deduction.

      The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources will, in effect, represent a return
of a portion of each shareholder's investment. All, or a portion, of such
payments will not be taxable to shareholders.

      After the end of the calendar year, shareholders will receive full
information on their dividends and capital gains distributions for tax
purposes. Shareholders will also be notified of their proportionate share of
long-term capital gains distributions that are eligible for a reduced rate of
tax under the Taxpayer Relief Act of 1997. To avoid being subject to a 31%
federal backup withholding tax on taxable dividends, capital gains
distributions and the proceeds of redemptions and repurchases, shareholders'
taxpayer identification numbers must be furnished and certified as to accuracy.
 
      Shareholders should consult their tax advisors as to the applicability of
the foregoing to their current situation.

PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------

From time to time the Fund may quote its "total return" in advertisements and
sales literature. These figures are computed separately for Class A, Class B,
Class C and Class D shares. The total return of the Fund is based on historical
earnings and is not intended to indicate future performance. The "average
annual total return" of the Fund refers to a figure reflecting the average
annualized percentage increase (or decrease) in the value of an initial
investment in a Class of the Fund of $1,000 over periods of one, five and ten
years. Average annual total return reflects all income earned by the Fund, any
appreciation or depreciation of the Fund's assets, all expenses incurred by the
applicable Class and all sales charges which will be incurred by shareholders,
for the stated periods. It also assumes reinvestment of all dividends and
distributions paid by the Fund.

      In addition to the foregoing, the Fund may advertise its total return for
each Class over different periods of time by means of aggregate, average, year
by year or other types of total return figures. Such calculations may or may
not reflect the deduction of any sales charge which, if reflected, would reduce
the performance quoted. The Fund may also advertise the growth of hypothetical
investments of $10,000, $50,000 and $100,000 in each Class of shares of the
Fund. The Fund from time to time may also advertise its performance relative to
certain performance rankings and indexes compiled by independent organizations,
such as mutual fund performance rankings of Lipper Analytical Services, Inc.

26
<PAGE>

ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

VOTING RIGHTS. All shares of beneficial interest of the Fund are of $0.01 par
value and are equal as to earnings, assets and voting privileges except that
each Class will have exclusive voting privileges with respect to matters
relating to distribution expenses borne solely by such Class or any other
matter in which the interests of one Class differ from the interests of any
other Class. In addition, Class B shareholders will have the right to vote on
any proposed material increase in Class A's expenses, if such proposal is
submitted separately to Class A shareholders. Also, as discussed herein, Class
A, Class B and Class C bear the expenses related to the distribution of their
respective shares.

      The Fund is not required to hold Annual Meetings of Shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Trustees may call Special Meetings of Shareholders for action by shareholder
vote as may be required by the Act or the Declaration of Trust. Under certain
circumstances the Trustees may be removed by action of the Trustees or by the
shareholders.

      Under Massachusetts law, shareholders of a business trust may, under
certain circumstances, be held personally liable as partners for the
obligations of the Fund. However, the Declaration of Trust contains an express
disclaimer of shareholder liability for acts or obligations of the Fund,
requires that Fund obligations include such disclaimer, and provides for
indemnification and reimbursement of expenses out of the property of the Fund
for any shareholder held personally liable for the obligations of the Fund.
Thus, the risk of a shareholder incurring financial loss on account of
shareholder liability is limited to circumstances in which the Fund itself
would be unable to meet its obligations. Given the above limitations on
shareholder personal liability, and the nature of the Fund's assets and
operations, the possibility of the Fund being unable to meet its obligations is
remote and 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 MSDW Advisors, MSDW
Services and MSDW Distributors are subject to a strict Code of Ethics adopted
by those companies. The Code of Ethics is intended to ensure that the interests
of shareholders and other clients are placed ahead of any personal interest,
that no undue personal benefit is obtained from a person's employment
activities and that actual and potential conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by
employees of the companies be subject to an advance clearance process to
monitor that no Morgan Stanley 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 Morgan Stanley Dean Witter Fund managed by them. Any
violations of the Code of Ethics are subject to sanctions, including reprimand,
demotion or suspension or termination of employment. The Code of Ethics
comports with regulatory requirements and the recommendations in the 1994
report by the Investment Company Institute Advisory Group on Personal
Investing.

MASTER/FEEDER CONVERSION. The Fund reserves the right to seek to achieve its
investment objective by investing all of its investable assets in a
diversified, open-end management investment company having the same investment
objective and policies and substantially the same investment restrictions as
those applicable to the Fund.

SHAREHOLDER INQUIRIES. All inquiries regarding the Fund should be directed to
the Fund at the telephone numbers or address set forth on the front cover of
this Prospectus.

                                                                              27
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MORGAN STANLEY DEAN WITTER
DEVELOPING GROWTH SECURITIES TRUST
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048


BOARD OF TRUSTEES

Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Wayne E. Hedien
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder


OFFICERS

Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Barry Fink
Vice President, Secretary and
General Counsel

Jayne Stevlingson
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

Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311


INDEPENDENT ACCOUNTANTS

PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036


INVESTMENT MANAGER

Morgan Stanley Dean Witter Advisors Inc.



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