WITTER DEAN DIVIDEND GROWTH SECURITIES INC
497, 1997-07-31
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<PAGE>
                         DEAN WITTER
                         DIVIDEND GROWTH SECURITIES
                         PROSPECTUS--JULY 28, 1997
 
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DEAN WITTER DIVIDEND GROWTH SECURITIES INC. (THE "FUND") IS AN OPEN-END,
DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT OBJECTIVE IS TO
PROVIDE REASONABLE CURRENT INCOME AND LONG-TERM GROWTH OF INCOME AND CAPITAL.
THE FUND INVESTS PRIMARILY IN COMMON STOCK OF COMPANIES WITH A RECORD OF PAYING
DIVIDENDS AND THE POTENTIAL FOR INCREASING DIVIDENDS. (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. Except as discussed herein, shares of the Fund held
prior to July 28, 1997 have been designated Class B shares. (See "Purchase of
Fund Shares--Alternative Purchase Arrangements.")
 
This Prospectus sets forth concisely the information you should know before
investing in the Fund. It should be read and retained for future reference.
Additional information about the Fund is contained in the Statement of
Additional Information, dated July 28, 1997, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
 
Summary of Fund Expenses..........................       4
 
Financial Highlights..............................       5
 
The Fund and its Management.......................       6
 
Investment Objective and Policies.................       6
 
  Risk Considerations and Investment Practices....       7
 
Investment Restrictions...........................       9
 
Purchase of Fund Shares...........................       9
 
Shareholder Services..............................      17
 
Redemptions and Repurchases.......................      19
 
Dividends, Distributions and Taxes................      20
 
Performance Information...........................      20
 
Additional Information............................      21
</TABLE>
 
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.
 
DEAN WITTER
DIVIDEND GROWTH SECURITIES INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550 or (800) 869-NEWS (toll-free)
 
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  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                   DEAN WITTER DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>             <C>
THE FUND        The Fund, a Maryland corporation, is an open-end, diversified management investment
                company investing primarily in common stock of companies with a record of paying
                dividends and the potential for increasing dividends (see page 6).
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SHARES OFFERED  Shares of common stock with $0.01 par value (see page 21). The Fund offers four Classes
                of shares, each with a different combination of sales charges, ongoing fees and other
                features (see pages 9-17).
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MINIMUM         The minimum initial investment for each Class is $1,000 ($100 if the account is opened
PURCHASE        through EasyInvest-SM-). Class D shares are only available to persons investing $5
                million or more and to certain other limited categories of investors. For the purpose of
                meeting the minimum $5 million investment for Class D shares, and subject to the $1,000
                minimum initial investment for each Class of the Fund, an investor's existing holdings
                of Class A shares and shares of funds for which Dean Witter InterCapital Inc. serves as
                investment manager ("Dean Witter Funds") that are sold with a front-end sales charge,
                and concurrent investments in Class D shares of the Fund and other Dean Witter Funds
                that are multiple class funds, will be aggregated. The minimum subsequent investment is
                $100 (see page 9).
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INVESTMENT      The investment objective of the Fund is to provide reasonable current income and
OBJECTIVE       long-term growth of income and capital.
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INVESTMENT      Dean Witter InterCapital Inc., ("InterCapital"), the Investment Manager of the Fund, and
MANAGER         its wholly- owned subsidiary, Dean Witter Services Company Inc., serve in various
                investment management, advisory, management and administrative capacities to 100
                investment companies and other portfolios with assets of approximately $96.6 billion at
                June 30, 1997 (see page 6).
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MANAGEMENT      The Investment Manager receives a monthly fee at an annual rate of 0.625 of 1% of daily
FEE             net assets, scaled down on assets over $250 million. The fee should not be compared with
                fees paid by other investment companies without also considering applicable sales loads
                and distribution fees, including those noted below (see page 6).
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DISTRIBUTOR     Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution
AND             plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with
DISTRIBUTION    respect to the distribution fees paid by the Class A, Class B and Class C shares of the
FEE             Fund to the Distributor. The entire 12b-1 fee payable by Class A and a portion of the
                12b-1 fee payable by each of Class B and Class C equal to 0.25% of the average daily net
                assets of 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 9 and 15).
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ALTERNATIVE     Four classes of shares are offered:
PURCHASE
ARRANGEMENTS    - 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 9, 12 and 15).
 
                - 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 since
                implementation of the 12b-1 Plan on July 2, 1984, or (b) the average daily net assets of
                Class B attributable to shares issued since implementation of the 12b-1 Plan. All shares
                of the Fund held prior to July 28, 1997 (other than shares which were purchased prior to
                July 2, 1984 (and, with respect to such shares, certain shares acquired through
                reinvestment of dividends and capital gains distributions) and the shares held by
                certain employee benefit plans established by Dean Witter Reynolds Inc. and its
                affiliate, SPS Transaction Services, Inc.) have been designated Class B shares. Shares
                which were purchased prior to July 2, 1984 (and, with respect to such shares, certain
                shares acquired through reinvestment of dividends and capital gains distributions) and
                shares held by those employee benefit plans prior to July 28, 1997 have been designated
                Class D shares. Shares held before May 1, 1997 that have been designated Class B shares
                will convert to Class A shares in May, 2007. In all other instances, Class B shares
                convert to Class A shares approximately ten years after the date of the original
                purchase (see pages 9, 13 and 15).
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</TABLE>
 
2
<PAGE>
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<TABLE>
<S>             <C>
                - 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 9 and 15).
 
                - Class D shares are offered only to investors meeting an initial investment minimum of
                $5 million and to certain other limited categories of investors. Class D shares are
                offered without a front-end sales charge or CDSC and are not subject to any 12b-1 fee
                (see pages 9 and 15).
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DIVIDENDS AND   Dividends from net investment income are paid quarterly; and distributions from net
CAPITAL GAINS   capital gains, if any, are distributed at least annually. The Fund may, however,
DISTRIBUTIONS   determine to retain all or part of any net long- term capital gains in any year for
                reinvestment. Dividends and capital gains distributions paid on shares of a Class are
                automatically reinvested in additional shares of the same Class at net asset value
                unless the shareholder elects to receive cash. Shares acquired by dividend and
                distribution reinvestment will not be subject to any sales charge or CDSC (see pages 17
                and 20).
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REDEMPTION      Shares are redeemable by the shareholder at net asset value less any applicable CDSC on
                Class A, Class B or Class C shares. An account may be involuntarily redeemed if the
                total value of the account is less than $100 or, if the account was opened through
                EasyInvest-SM-, if after twelve months the shareholder has invested less than $1,000 in
                the account (see page 19).
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RISKS           The net asset value of the Fund's shares will fluctuate with changes in market value of
                portfolio securities. Dividends payable by the Fund will vary in relation to the amounts
                of dividends and interest earned on portfolio securities. Investors should review the
                investment objective and policies of the Fund carefully and consider their ability to
                assume the risks involved in purchasing shares of the Fund (see pages 7-8).
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</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
  ELSEWHERE IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION
 
                                                                               3
<PAGE>
SUMMARY OF FUND EXPENSES
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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 February 28, 1997.
 
<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.................................................................   0.39%       0.39%     0.39%       0.39%
12b-1 Fees (5) (6)..............................................................   0.25%       0.74%     1.00%       None
Other Expenses..................................................................   0.09%       0.09%     0.09%       0.09%
Total Fund Operating Expenses (7)...............................................   0.73%       1.22%     1.48%       0.48%
</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").
(7) THERE WERE NO OUTSTANDING SHARES OF CLASS A, CLASS C OR CLASS D PRIOR TO THE
    DATE OF THIS PROSPECTUS. ACCORDINGLY, "TOTAL FUND OPERATING EXPENSES," AS
    SHOWN ABOVE WITH RESPECT TO THOSE CLASSES, ARE BASED UPON THE SUM OF 12B-1
    FEES, MANAGEMENT FEES AND ESTIMATED "OTHER EXPENSES."
 
<TABLE>
<CAPTION>
EXAMPLES                                                                 1 YEAR       3 YEARS      5 YEARS     10 YEARS
                                                                       -----------  -----------  -----------  -----------
<S>                                                                    <C>          <C>          <C>          <C>
You would pay the following expenses on a $1,000 investment assuming
 (1) a 5% annual return and (2) redemption at the end of each time
 period:
    Class A..........................................................   $      60    $      75    $      91    $     138
    Class B..........................................................   $      62    $      69    $      87    $     148
    Class C..........................................................   $      25    $      47    $      81    $     177
    Class D..........................................................   $       5    $      15    $      27    $      60
 
You would pay the following expenses on the same $1,000 investment
 assuming no redemption at the end of the period:
    Class A..........................................................   $      60    $      75    $      91    $     138
    Class B..........................................................   $      12    $      39    $      67    $     148
    Class C..........................................................   $      15    $      47    $      81    $     177
    Class D..........................................................   $       5    $      15    $      27    $      60
</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
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The following ratios and per share data for a share of capital stock outstanding
throughout each period have been audited by Price Waterhouse LLP, independent
accountants. The financial highlights should be read in conjunction with the
financial statements and 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 Stockholders, which may be obtained without charge upon request
to the Fund. All shares of the Fund held prior to July 28, 1997, other than
shares which were purchased prior to July 2, 1984 (and, with respect to such
shares, certain shares acquired through reinvestment of dividends and capital
gains distributions (collectively, the "Old Shares")) and shares held by certain
employee benefit plans established by Dean Witter Reynolds Inc. and its
affiliate, SPS Transaction Services, Inc., have been designated Class B shares.
The Old Shares and shares held by those employee benefit plans prior to July 28,
1997 have been designated Class D shares.
 
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED FEBRUARY 28,
                           -------------------------------------------------------------------------------------------------
                            1997      1996*     1995      1994      1993      1992*     1991      1990      1989      1988*
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                        <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of period....  $39.65    $31.16    $30.86    $28.70    $27.01    $23.50    $22.47    $20.32    $19.28    $20.63
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net investment
   income................    0.81      0.75      0.72      0.68      0.70      0.71      0.79      0.72      0.68      0.67
  Net realized and
   unrealized gain
   (loss)................    7.55      8.50      0.24      2.16      1.72      3.63      1.04      2.83      1.78     (0.99)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Total from investment
   operations............    8.36      9.25      0.96      2.84      2.42      4.34      1.83      3.55      2.46     (0.32)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Less dividends and
   distributions from:
    Net investment
     income..............   (0.88)    (0.67)    (0.66)    (0.68)    (0.69)    (0.76)    (0.80)    (0.76)    (0.62)    (0.73)
    Net realized gain....   (0.53)    (0.09)     --        --       (0.04)    (0.07)     --       (0.64)    (0.80)    (0.30)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Total dividends and
   distributions.........   (1.41)    (0.76)    (0.66)    (0.68)    (0.73)    (0.83)    (0.80)    (1.40)    (1.42)    (1.03)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net asset value, end of
   period................  $46.60    $39.65    $31.16    $30.86    $28.70    $27.01    $23.50    $22.47    $20.32    $19.28
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT
  RETURN+................   21.37%    30.01%     3.25%     9.98%     9.13%    18.82%     8.51%    17.85%    13.26%    (1.40)%
  Ratios to Average Net
   Assets:
    Expenses.............    1.22%     1.31%     1.42%     1.37%     1.40%     1.42%     1.51%     1.41%     1.55%     1.55%
    Net investment
     income..............    1.95%     2.14%     2.42%     2.31%     2.67%     2.91%     3.62%     3.46%     3.44%     3.47%
 
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in millions...  $12,907   $9,782    $7,101    $6,712    $5,386    $4,071    $3,015    $2,760    $1,860    $1,824
  Portfolio turnover
   rate..................       4%       10%        6%       13%        8%        5%        5%        3%        8%        7%
  Average commission rate
   paid..................  $0.0541     --        --        --        --        --        --        --        --        --
</TABLE>
 
- ------------
* YEAR ENDED FEBRUARY 29.
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 
                                                                               5
<PAGE>
THE FUND AND ITS MANAGEMENT
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Dean  Witter  Dividend  Growth  Securities Inc.  (the  "Fund")  is  an open-end,
diversified management investment company  incorporated in Maryland on  December
22, 1980.
 
    Dean  Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
investment manager.  The Investment  Manager, which  was incorporated  in  July,
1992,  is a wholly-owned  subsidiary of Morgan Stanley,  Dean Witter, Discover &
Co., a preeminent global financial  services firm that maintains leading  market
positions  in each of its three primary businesses--securities, asset management
and credit services.
 
    InterCapital and its wholly-owned  subsidiary, Dean Witter Services  Company
Inc.,   serve  in  various  investment   management,  advisory,  management  and
administrative capacities  to  100 investment  companies,  thirty of  which  are
listed   on  the  New  York  Stock  Exchange,  with  combined  total  assets  of
approximately $93.1  billion  at June  30,  1997. The  Investment  Manager  also
manages  portfolios of pension  plans, other institutions  and individuals which
aggregated approximately $3.5 billion at such date.
 
    The Fund  has  retained the  Investment  Manager to  provide  administrative
services,  manage its business  affairs and manage the  investment of the Fund's
assets, including the placing of orders  for the purchase and sale of  portfolio
securities.  InterCapital  has retained  Dean  Witter Services  Company  Inc. to
perform the  aforementioned administrative  services for  the Fund.  The  Fund's
Board  of  Directors reviews  the various  services  provided by  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 at an annual  rate
of 0.625% of the daily net assets of the Fund up to $250 million, scaled down at
various  asset levels to 0.275% on assets  over $15 billion. For the fiscal year
ended February 28, 1997, the Fund  accrued total compensation to the  Investment
Manager amounting to 0.39% of the Fund's average daily net assets and the Fund's
total expenses amounted to 1.22% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is to provide reasonable current income and
long-term  growth of income  and capital. This objective  is fundamental and may
not be changed  without shareholder  approval. There  is no  assurance that  the
objective  will be achieved. The Fund  seeks to achieve its investment objective
primarily through investments  in common  stock of  companies with  a record  of
paying  dividends and the potential for increasing dividends. Net asset value of
the Fund's shares  will fluctuate  with changes  in market  values of  portfolio
securities.  The Fund will attempt to avoid speculative securities or those with
speculative characteristics.
 
SPECIFIC INVESTMENT POLICIES
 
The Fund has adopted the following  specific policies which are not  fundamental
investment policies and which may be changed by the Fund's Board of Directors:
 
        (1)  Up to 30% of  the value of the Fund's  total assets may be invested
    in: (a) convertible debt securities, convertible preferred securities,  U.S.
    Government  securities (securities issued or  guaranteed as to principal and
    interest by  the  United  States or  its  agencies  and  instrumentalities),
    investment  grade corporate debt securities  and/or money market instruments
    when, in the opinion of the  Investment Manager, the projected total  return
    on  such securities is equal to or greater than the expected total return on
    equity securities or  when such  holdings might  be expected  to reduce  the
    volatility of the portfolio (for purposes of this provision, the term "total
    return"  means  the  difference  between  the cost  of  a  security  and the
    aggregate of its  market value and  income earned); or  (b) in money  market
    instruments  under  any  one or  more  of the  following  circumstances: (i)
    pending investment  of proceeds  of  sale of  Fund  shares or  of  portfolio
    securities; (ii) pending settlement of purchases of portfolio securities; or
    (iii)   to  maintain  liquidity  for  the  purpose  of  meeting  anticipated
    redemptions.
 
        (2) Notwithstanding  any  of the  foregoing  limitations, the  Fund  may
    invest  more than  30% of  its total assets  in money  market instruments to
    maintain, temporarily, a  "defensive" posture  when, in the  opinion of  the
    Investment  Manager, it is advisable to do  so because of economic or market
    conditions.
 
    The foregoing limitations will apply at the time of acquisition based on the
last determined  value  of the  Fund's  assets.  Any subsequent  change  in  any
applicable  percentage resulting from  fluctuations in value  or other change in
total assets will not  require elimination of any  security from the  portfolio.
The Fund may purchase securities on a when-issued or delayed delivery basis, may
purchase  or  sell securities  on a  forward commitment  basis and  may purchase
securities on a "when, as and if issued" basis.
 
6
<PAGE>
REPURCHASE AGREEMENTS
 
The Fund may enter into repurchase agreements, which may be viewed as a type  of
secured  lending by the Fund, and which typically involve the acquisition by the
Fund of  government securities  or  other securities  from a  selling  financial
institution  such as a bank, savings  and loan association or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the  future, usually not more than  seven days from the date  of
purchase.
 
RISK CONSIDERATIONS AND
INVESTMENT PRACTICES
 
AMERICAN DEPOSITORY RECEIPTS.  The Fund may invest in ADRs. These securities may
not necessarily be denominated in the same currency as the securities into which
they  may be converted.  ADRs are receipts  typically issued by  a United States
bank or trust company evidencing ownership of the underlying securities.
 
INVESTMENTS IN SECURITIES  RATED BAA BY  MOODY'S OR BBB  BY S&P.   The Fund  may
invest a portion of their assets in fixed-income securities rated at the time of
purchase  Baa or better by Moody's Investors Service, Inc. ("Moody's") or BBB or
better by Standard  & Poor's  Corporation ("S&P").  Investments in  fixed-income
securities  rated either Baa by Moody's or BBB by S&P (the lowest credit ratings
designated  "investment  grade")  may  have  speculative  characteristics   and,
therefore, changes in economic conditions or other circumstances are more likely
to  weaken their capacity to make principal  and interest payments than would be
the case with investments  in securities with higher  credit ratings. If a  bond
held  by the Fund is downgraded by a rating agency to a rating below Baa or BBB,
the Fund will retain such security in its portfolio until the Investment Manager
determines that it is practicable to  sell the security without undue market  or
tax  consequences  to the  Fund. In  the event  that such  downgraded securities
constitute 5% or more of the Fund's assets, the Investment Manager will seek  to
sell immediately sufficient securities to reduce the total to below 5%.
 
INVESTMENTS  IN FIXED-INCOME SECURITIES.   The Fund may invest  a portion of its
assets in fixed-income  securities. All fixed-income  securities are subject  to
two  types of risks: the credit risk and the interest rate risk. The credit risk
relates to the ability of the issuer  to meet interest or principal payments  or
both  as they come  due. Generally, higher  yielding fixed-income securities are
subject to a credit  risk to a greater  extent than lower yielding  fixed-income
securities.  The interest rate risk refers to  the fluctuations in the net asset
value of any  portfolio of  fixed-income securities resulting  from the  inverse
relationship  between price and yield of  fixed-income securities; that is, when
the  general  level  of  interest   rates  rises,  the  prices  of   outstanding
fixed-income  securities generally decline, and when interest rates fall, prices
generally rise.
 
CONVERTIBLE SECURITIES.    The  Fund may  invest  a  portion of  its  assets  in
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
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,  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.
 
    Because of the special nature of  the Fund's permitted investments in  lower
rated  convertible  securities,  the  Investment Manager  must  take  account of
certain special  considerations  in assessing  the  risks associated  with  such
investments.  The prices of  lower rated securities  have been found  to be less
sensitive to changes in prevailing interest rates than higher rated investments,
but are likely to  be more sensitive to  adverse economic changes or  individual
corporate  developments. During  an economic  downturn or  substantial period of
rising interest rates, highly leveraged issuers may experience financial  stress
which  would  adversely  affect their  ability  to service  their  principal and
interest payment  obligations, to  meet  their projected  business goals  or  to
obtain additional financing. If the issuer of a lower rated convertible security
owned  by the  Fund defaults,  the Fund  may incur  additional expenses  to seek
recovery. In  addition,  periods  of  economic uncertainty  and  change  can  be
expected  to result in an  increased volatility of market  prices of lower rated
securities and a corresponding volatility in the  net asset value of a share  of
the Fund.
 
REPURCHASE  AGREEMENTS.  While  repurchase agreements involve  certain risks not
associated  with  direct  investments  in  debt  securities,  the  Fund  follows
procedures  designed to minimize such  risks. These procedures include effecting
 
                                                                               7
<PAGE>
repurchase transactions only with  large, well-capitalized and  well-established
financial  institutions whose financial condition  will be continually monitored
by the Investment Manager. 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. It
is the current policy of the Fund not to invest in repurchase agreements that do
not  mature within seven  days if any  such investment, together  with any other
illiquid assets held by the Fund, amounts to more than 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 in the following paragraph, are not
subject to the foregoing restriction).  These securities are generally  referred
to  as private placements or restricted securities. Limitations on the resale of
such securities  may have  an adverse  effect on  their marketability,  and  may
prevent  the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of  registering such securities for resale and  the
risk of substantial delays in effecting such registration.
 
    The  Securities  and Exchange  Commission has  adopted  Rule 144A  under the
Securities Act,  which  permits  the  Fund  to  sell  restricted  securities  to
qualified  institutional  buyers  without  limitation.  The  Investment Manager,
pursuant to  procedures  adopted by  the  Directors 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 10% of the  Fund's net assets. However, investing in  Rule
144A  securities  could  have  the  effect  of  increasing  the  level  of  Fund
illiquidity to the extent the Fund, at a particular point in time, may be unable
to find qualified institutional buyers interested in purchasing securities.
 
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.
 
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  stockholders in effect will  be absorbing duplicate levels  of
fees with respect to investments in real estate investment trusts.
 
    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. In determining which securities to
purchase for the Fund  or hold in the  Fund's portfolio, the Investment  Manager
will  rely on information from various sources, including research, analysis and
appraisals of brokers and dealers,  including Dean Witter Reynolds Inc.  ("DWR")
and  other brokers and  dealers that are affiliates  of InterCapital, and others
regarding economic developments  and interest  rate trends,  and the  Investment
Manager's  own analysis  of factors it  deems relevant. The  Fund's portfolio is
managed within InterCapital's Growth and  Income Group, which manages 22  equity
funds  and fund portfolios with approximately $27.4 billion in assets as of June
30, 1997. Paul D. Vance, Senior Vice  President of InterCapital and a member  of
InterCapital's  Growth and Income Group, has  been the primary portfolio manager
of the Fund since its inception
 
8
<PAGE>
and has been a portfolio manager at InterCapital for over five years.
 
    Although the Fund  does not engage  in substantial short-term  trading as  a
means  of achieving its  investment objective, it  may sell portfolio securities
without regard to the length of time they have been held, in accordance with the
investment policies described earlier.  Pursuant to an  order of the  Securities
and  Exchange Commission, the Fund may  effect principal transactions in certain
money market instruments  with DWR. In  addition, the Fund  may incur  brokerage
commissions  on transactions conducted through DWR and other brokers and dealers
that are affiliates of the Investment Manager.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below  are among the restrictions which  have
been  adopted by the Fund as  fundamental policies. Under the Investment Company
Act of 1940, as  amended (the "Act"),  a fundamental policy  may not be  changed
without the vote of a majority of the outstanding voting securities of the Fund,
as  defined  in the  Act. For  purposes  of the  following limitations:  (i) all
percentage limitations apply immediately after a purchase or initial investment;
and (ii)  any subsequent  change  in any  applicable percentage  resulting  from
market  fluctuations or other  changes in total  or net assets  does not require
elimination of any security from the portfolio.
 
    The Fund may not:
 
        1. Invest  more  than  5% of  the  value  of its  total  assets  in  the
    securities of any one issuer (other than obligations issued or guaranteed by
    the United States Government, its agencies or instrumentalities).
 
        2.  Purchase more than  10% of all outstanding  voting securities or any
    class of securities of any one issuer.
 
        3. Invest more than 25% of the  value of its total assets in  securities
    of  issuers in  any one  industry. This restriction  does not  apply to bank
    obligations or  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  issued  or  guaranteed  by  the  United  States  Government, its
    agencies or instrumentalities.
 
    Notwithstanding any other  investment policy  or restriction,  the Fund  may
seek  to achieve its investment objective  by investing all or substantially all
of its  assets  in another  investment  company having  substantially  the  same
investment objective and policies as the Fund.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
The  Fund offers each class of its shares for sale to the public on a continuous
basis. Pursuant to  a Distribution Agreement  between the Fund  and Dean  Witter
Distributors  Inc. (the "Distributor"), an  affiliate of the Investment Manager,
shares of the Fund  are distributed by  the Distributor and  offered by DWR  and
others  who have  entered into selected  dealer agreements  with the Distributor
("Selected Broker-Dealers"). The principal  executive office of the  Distributor
is located at Two World Trade Center, New York, New York 10048.
 
    The Fund offers four classes of shares (each, a "Class"). Class A shares are
sold  to investors with an initial sales charge that declines to zero for larger
purchases; however, Class  A shares  sold without  an initial  sales charge  are
subject  to  a contingent  deferred sales  charge ("CDSC")  of 1.0%  if redeemed
within one year of purchase, except for certain specific circumstances. Class  B
shares  are  sold without  an initial  sales charge  but are  subject to  a CDSC
(scaled down from 5.0% to 1.0%)  payable upon most redemptions within six  years
after    purchase.   (Class   B   shares    purchased   by   certain   qualified
employer-sponsored benefit plans are subject to a CDSC scaled down from 2.0%  to
1.0%  if redeemed within  three years after  purchase.) Class C  shares are sold
without an  initial sales  charge but  are subject  to a  CDSC of  1.0% on  most
redemptions made within one year after purchase. Class D shares are sold without
an  initial sales charge or CDSC and  are available only to investors meeting an
initial  investment  minimum  of  $5  million,  and  to  certain  other  limited
categories  of investors.  At the  discretion of the  Board of  Directors of the
Fund, Class A shares may be sold to categories of investors in addition to those
set forth  in this  prospectus at  net  asset value  without a  front-end  sales
charge, and Class D shares may be sold to certain other categories of investors,
in each case as may be described in the then current prospectus of the Fund. See
"Alternative  Purchase  Arrangements--  Selecting  a  Particular  Class"  for  a
discussion of  factors  to  consider  in selecting  which  Class  of  shares  to
purchase.
 
    The  minimum initial purchase  is $1,000 for each  Class of shares, although
Class D shares are only available to persons investing $5 million or more and to
certain other limited categories  of investors. For the  purpose of meeting  the
minimum  $5 million initial  investment for Class  D shares, and  subject to the
$1,000 minimum initial
invest-
 
                                                                               9
<PAGE>
ment for each  Class of the  Fund, an  investor's existing holdings  of Class  A
shares  of the Fund  and other Dean  Witter Funds that  are multiple class funds
("Dean Witter Multi-Class Funds")  and shares of Dean  Witter Funds sold with  a
front-end  sales  charge ("FSC  Funds") and  concurrent  investments in  Class D
shares of the Fund and other  Dean Witter Multi-Class Funds will be  aggregated.
Subsequent  purchases of $100 or more may be made by sending a check, payable to
Dean Witter  Dividend Growth  Securities  Inc., directly  to Dean  Witter  Trust
Company  (the "Transfer Agent")  at P.O. Box  1040, Jersey City,  NJ 07303 or by
contacting an account  executive of  DWR or other  Selected Broker-Dealer.  When
purchasing  shares of the  Fund, investors must specify  whether the purchase is
for Class A, Class B, Class C or  Class D shares. If no Class is specified,  the
Transfer  Agent  will not  process  the transaction  until  the proper  Class is
identified. The  minimum initial  purchase in  the case  of investments  through
EasyInvest-SM-,  an  automatic purchase  plan  (see "Shareholder  Services"), is
$100, provided  that  the  schedule  of automatic  investments  will  result  in
investments  totalling $1,000  within the  first twelve  months. In  the case of
investments pursuant to Systematic Payroll Deduction Plans (including Individual
Retirement Plans), the Fund, in  its discretion, may accept investments  without
regard to any minimum amounts which would otherwise be required, if the Fund has
reason  to believe that  additional investments will  increase the investment in
all accounts  under such  Plans  to at  least  $1,000. Certificates  for  shares
purchased  will not be issued unless requested  by the shareholder in writing to
the Transfer Agent.
 
    Shares of  the Fund  are sold  through  the Distributor  on a  normal  three
business day settlement basis; that is, payment is due on the third business day
(settlement  date) after the order is placed with the Distributor. 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 Trust by the  Distributor or any of its affiliates and/or
the Selected Broker-Dealer. In  addition, some sales  personnel of the  Selected
Broker-Dealer  will receive  various types  of non-cash  compensation as special
sales incentives,  including trips,  educational  and/or business  seminars  and
merchandise.  The  Fund and  the  Distributor reserve  the  right to  reject any
purchase orders.
 
ALTERNATIVE PURCHASE ARRANGEMENTS
 
The Fund offers several Classes of shares to investors designed to provide  them
with  the flexibility of selecting an investment best suited to their needs. The
general public  is offered  three Classes  of shares:  Class A  shares, Class  B
shares  and Class C shares,  which differ principally in  terms of sales charges
and rate of expenses to which they are subject. A fourth Class of shares,  Class
D  shares, is  offered only  to limited  categories of  investors (see  "No Load
Alternative--Class D Shares" below).
 
    Each Class A, Class B,  Class C or Class D  share of the Fund represents  an
identical  interest in the investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder  service
fees,  Class B and Class C shares  bear the expenses of the ongoing distribution
fees and Class A,  Class B and Class  C shares which are  redeemed subject to  a
CDSC bear the expense of the additional incremental distribution costs resulting
from  the CDSC applicable  to shares of those  Classes. The ongoing distribution
fees that are imposed  on Class A, Class  B and Class C  shares will be  imposed
directly  against those  Classes and  not against  all assets  of the  Fund and,
accordingly, such charges against one Class will not affect the net asset  value
of any other Class or have any impact on investors choosing another sales charge
option. See "Plan of Distribution" and "Redemptions and Repurchases."
 
    Set  forth below is a summary of the differences between the Classes and the
factors an  investor should  consider when  selecting a  particular Class.  This
summary  is qualified in its entirety by  detailed discussion of each Class that
follows this summary.
 
CLASS A SHARES.   Class A  shares are sold  at net asset  value plus an  initial
sales  charge of up  to 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 employer-sponsored benefit  plans are  subject to a  CDSC scaled  down
from  2.0% to 1.0% if redeemed within three years after purchase.) This CDSC may
be waived for certain redemptions. Class B shares are also subject to an  annual
12b-1  fee of 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 12b-1 Plan on July  2,
1984  (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 inception  of the  12b-1 Plan  upon which  a CDSC  has been
imposed  or  waived,  or   (b)  the  average  daily   net  assets  of  Class   B
attrib-
 
10
<PAGE>
utable  to shares issued, net of related shares redeemed, since inception of the
12b-1 Plan. 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 the  Fund's future return  cannot be predicted,  however,
there can be no assurance that this would be the case.
 
    Finally,  investors should  consider the effect  of the CDSC  period and any
conversion rights of  the Classes in  the context of  their own investment  time
frame. For example, although Class C shares are subject to a significantly lower
CDSC  upon redemptions, they do not, unlike Class B shares, convert into Class A
shares after approximately ten years, and, therefore, are subject to an  ongoing
12b-1  fee of 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 minimum  investment amount  for
Class D shares, holdings of Class A shares in all Dean Witter Multi-Class Funds,
shares  of FSC Funds and shares of Dean  Witter Funds for which such shares have
been exchanged will be included together with the current investment amount.
 
    Sales personnel may receive different compensation for selling each Class of
shares. Investors should understand that  the purpose of a  CDSC is the same  as
that  of the initial sales  charge in that the  sales charges applicable to each
Class provide for the financing of the distribution of shares of that Class.
 
    Set forth  below is  a chart  comparing  the sales  charge, 12b-1  fees  and
conversion options applicable to each Class of shares:
 
<TABLE>
<CAPTION>
                                                   CONVERSION
  CLASS          SALES CHARGE         12b-1 FEE      FEATURE
<C>        <S>                        <C>        <C>
    A      Maximum 5.25% initial        0.25%          No
           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% CDSC during     1.0%     B shares
           the first year decreasing             convert to A
           to 0 after six years                  shares
                                                 automatically
                                                 after
                                                 approximately
                                                 ten years
    C      1.0% CDSC during first       1.0%           No
           year
    D                None               None           No
</TABLE>
 
    See  "Purchase  of Fund  Shares" and  "The  Fund and  its Management"  for a
complete description of the sales charges and service and distribution fees  for
each  Class  of  shares  and "Determination  of  Net  Asset  Value," "Dividends,
Distributions and  Taxes"  and "Shareholder  Services--Exchange  Privilege"  for
other differences between the Classes of shares.
 
                                                                              11
<PAGE>
INITIAL SALES CHARGE ALTERNATIVE-- CLASS A SHARES
 
Class A shares are sold at net asset value plus an initial sales charge. In some
cases,  reduced sales charges may be  available, as described below. Investments
of $1 million or  more (and investments by  certain other limited categories  of
investors)  are not subject to any sales charges at the time of purchase but are
subject to a CDSC  of 1.0% on  redemptions made within  one year after  purchase
(calculated  from the last day of the month in which the shares were purchased),
except for  certain specific  circumstances. The  CDSC will  be assessed  on  an
amount equal to the lesser of the current market value or the cost of the shares
being  redeemed. The CDSC will not be imposed (i) in the circumstances set forth
below in  the section  "Contingent Deferred  Sales Charge  Alternative--Class  B
Shares--  CDSC Waivers," except  that the references  to six years  in the first
paragraph of that section shall mean one year in the case of Class A shares, and
(ii) in the circumstances identified in the section "Additional Net Asset  Value
Purchase  Options" below. Class A shares are also subject to an annual 12b-1 fee
of up to 0.25% of the average daily net assets of the Class.
 
    The offering price of Class A shares  will be the net asset value per  share
next  determined following receipt of an  order (see "Determination of Net Asset
Value" below), plus a  sales charge (expressed as  a percentage of the  offering
price) on a single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                         SALES CHARGE
                             -------------------------------------
                               PERCENTAGE OF       APPROXIMATE
         AMOUNT OF            PUBLIC OFFERING     PERCENTAGE OF
    SINGLE 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 through Systematic Payroll  Deduction
plans; or (g) any other organized group of persons, whether incorporated or not,
provided  the organization has been in existence for at least six months and has
some purpose other than  the purchase of redeemable  securities of a  registered
investment company at a discount.
 
COMBINED  PURCHASE PRIVILEGE.   Investors may have the  benefit of reduced sales
charges in accordance with the above schedule by combining purchases of Class  A
shares of the Fund in single transactions with the purchase of Class A shares of
other  Dean Witter Multi-Class Funds  and shares of FSC  Funds. The sales charge
payable on the purchase of the Class A shares of the Fund, the Class A shares of
the other Dean Witter Multi-Class Funds and the shares of the FSC Funds will  be
at  their  respective  rates applicable  to  the  total amount  of  the combined
concurrent purchases of such shares.
 
RIGHT OF  ACCUMULATION.   The above  persons  and entities  may benefit  from  a
reduction  of the  sales charges  in accordance with  the above  schedule if the
cumulative net asset value of Class A shares purchased in a single  transaction,
together  with  shares  of  the  Fund and  other  Dean  Witter  Funds previously
purchased at a price including a front-end sales charge (including shares of the
Fund and other  Dean Witter  Funds acquired in  exchange for  those shares,  and
including  in each  case shares acquired  through reinvestment  of dividends and
distributions), which  are held  at the  time of  such transaction,  amounts  to
$25,000  or more. If such investor has a cumulative net asset value of shares of
FSC Funds and  Class A and  Class D shares  equal to at  least $5 million,  such
investor  is eligible to purchase  Class D shares subject  to the $1,000 minimum
initial investment  requirement  of  that  Class  of  the  Fund.  See  "No  Load
Alternative--Class D Shares" below.
 
    The  Distributor must be notified by DWR  or a Selected Broker-Dealer or the
shareholder at the time a purchase  order is placed that the purchase  qualifies
for  the reduced  charge under the  Right of  Accumulation. Similar notification
must be made  in writing  by the  dealer or shareholder  when such  an order  is
placed  by  mail. The  reduced sales  charge will  not be  granted if:  (a) such
notification is not furnished at the time of  the order; or (b) a review of  the
records of the Selected Broker-Dealer or the Transfer Agent fails to confirm the
investor's represented holdings.
 
LETTER  OF INTENT.  The foregoing schedule of reduced sales charges will also be
available to investors who enter into  a written Letter of Intent providing  for
the purchase, within a thirteen-month period, of Class A shares of the Fund from
 
12
<PAGE>
DWR  or other Selected Broker-Dealers. The cost of Class A shares of the Fund or
shares of other  Dean Witter Funds  which were previously  purchased at a  price
including a front-end sales charge during the 90-day period prior to the date of
receipt  by the Distributor of the Letter of Intent, or of Class A shares of the
Fund or shares of  other Dean Witter  Funds acquired in  exchange for shares  of
such  funds purchased during such period at  a price including a front-end sales
charge, which  are still  owned by  the  shareholder, may  also be  included  in
determining the applicable reduction.
 
ADDITIONAL  NET ASSET VALUE PURCHASE OPTIONS.   In addition to investments of $1
million or more, Class A shares also may be purchased at net asset value by  the
following:
 
    (1) trusts for which Dean Witter Trust Company ("DWTC") or Dean Witter Trust
FSB  ("DWTFSB")  (each  of which  is  an  affiliate of  the  Investment Manager)
provides discretionary trustee services;
 
    (2)  persons  participating   in  a  fee-based   program  approved  by   the
Distributor,  pursuant to which such persons pay an asset based fee for services
in  the  nature  of  investment   advisory  or  administrative  services   (such
investments  are subject to  all of the  terms and conditions  of such programs,
which may include termination fees  and restrictions on transferability of  Fund
shares);
 
    (3)  retirement plans qualified under Section 401(k) of the Internal Revenue
Code ("401(k) plans") and other employer-sponsored plans qualified under Section
401(a) of the Internal Revenue Code with at least 200 eligible employees and for
which DWTC or DWTFSB serves as Trustee  or the 401(k) Support Services Group  of
DWR serves as recordkeeper;
 
    (4)  401(k) plans and other employer-sponsored plans qualified under Section
401(a) of the Internal Revenue Code for  which DWTC or DWTFSB serves as  Trustee
or the 401(k) Support Services Group of DWR serves as recordkeeper whose Class B
shares  have converted to Class A shares, regardless of the plan's asset size or
number of eligible employees;
 
    (5) investors who are clients of a Dean Witter account executive who  joined
Dean  Witter from another investment firm within six months prior to the date of
purchase of Fund  shares by such  investors, if the  shares are being  purchased
with  the proceeds from a redemption of shares of an open-end proprietary mutual
fund of the account executive's previous  firm which imposed either a  front-end
or  deferred sales  charge, provided  such purchase  was made  within sixty days
after the redemption and the proceeds  of the redemption had been maintained  in
the interim in cash or a money market fund; and
 
    (6)  other  categories of  investors,  at the  discretion  of the  Board, as
disclosed in the then current prospectus of the Fund.
 
    No CDSC  will be  imposed on  redemptions of  shares purchased  pursuant  to
paragraphs (1), (2) or (5), above.
 
    For  further information concerning purchases  of the Fund's shares, contact
DWR or another  Selected Broker-Dealer  or consult the  Statement of  Additional
Information.
 
CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES
 
Class  B shares are sold  at net asset value  next determined without an initial
sales charge so that the  full amount of an  investor's purchase payment may  be
immediately invested in the Fund. A CDSC, however, will be imposed on most Class
B  shares redeemed within six years after  purchase. The CDSC will be imposed on
any redemption of shares if after such redemption the aggregate current value of
a Class  B  account with  the  Fund falls  below  the aggregate  amount  of  the
investor's  purchase payments for Class B shares  made during the six years (or,
in the case of  shares held by certain  employer-sponsored benefit plans,  three
years)  preceding the redemption. In addition, Class  B shares are subject to an
annual 12b-1 fee of 1.0% of the lesser of: (a) the average daily aggregate gross
sales of the Fund's Class B shares since the inception of the Fund's 12b-1  Plan
on  July  2, 1984  (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 Plan's inception upon  which a CDSC has been
imposed or waived, or (b) the average  daily net assets of Class B  attributable
to Class B shares issued, net of related shares redeemed, since inception of the
Plan.
 
    Except  as noted below,  Class B shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were  purchased) will  not be subject  to any  CDSC upon  redemption.
Shares  redeemed earlier than six years  after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed.  The size of this percentage will  depend
upon how long the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
               YEAR SINCE                 CDSC AS A PERCENTAGE
         PURCHASE 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  held by 401(k)  plans or other
employer-sponsored plans qualified under Section 401(a) of the Internal  Revenue
Code   for   which   DWTC  or   DWTFSB   serves   as  Trustee   or   the  401(k)
 
                                                                              13
<PAGE>
Support Services Group  of DWR  serves as  recordkeeper and  whose accounts  are
opened  on or  after July 28,  1997, shares held  for three years  or more after
purchase (calculated as described in the paragraph above) will not be subject to
any CDSC  upon redemption.  However, shares  redeemed earlier  than three  years
after  purchase  may  be subject  to  a  CDSC (calculated  as  described  in the
paragraph above), the  percentage of which  will depend on  how long the  shares
have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
               YEAR SINCE                 CDSC AS A PERCENTAGE
         PURCHASE 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 employer-sponsored benefit plans, three years)  preceding
the  redemption; (ii) the current net asset  value of shares purchased more than
six years (or, in the case of shares held by certain employer-sponsored  benefit
plans,  three years) prior  to the redemption;  and (iii) the  current net asset
value of shares  purchased through  reinvestment of  dividends or  distributions
and/or  shares acquired  in exchange for  shares of  FSC Funds or  of other Dean
Witter Funds  acquired in  exchange for  such shares.  Moreover, in  determining
whether  a CDSC is applicable it will  be assumed that amounts described in (i),
(ii) and (iii) above (in  that order) are redeemed  first. In addition, no  CDSC
will  be imposed on redemptions of shares which are attributable to reinvestment
of dividends or distributions from, or the proceeds of, certain Unit  Investment
Trusts.
 
    In  addition, the CDSC, if otherwise applicable,  will be waived in the case
of:
 
    (1) redemptions of  shares held at  the time a  shareholder dies or  becomes
disabled,  only if  the shares  are:  (A)  registered either  in the  name of an
individual shareholder (not a  trust), or in the  names of such shareholder  and
his or her spouse as joint tenants with right of survivorship; or  (B) held in a
qualified  corporate  or  self-employed retirement  plan,  Individual Retirement
Account ("IRA") or  Custodial Account  under Section 403(b)(7)  of the  Internal
Revenue  Code ("403(b)  Custodial Account"),  provided in  either case  that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2)  redemptions   in  connection   with  the   following  retirement   plan
distributions:   (A) lump-sum or other  distributions from a qualified corporate
or self-employed retirement plan following retirement (or, in the case of a "key
employee" of a  "top heavy"  plan, following  attainment of  age 59  1/2);   (B)
distributions  from an IRA  or 403(b) Custodial  Account following attainment of
age 59 1/2; or  (C) a tax-free return of an excess contribution to an IRA; and
 
    (3) all redemptions of  shares held for  the benefit of  a participant in  a
401(k)  plan or other employer-sponsored plan  qualified under Section 401(a) of
the Internal  Revenue Code  which  offers investment  companies managed  by  the
Investment  Manager or  its subsidiary,  Dean Witter  Services Company  Inc., as
self-directed investment alternatives  and for  which DWTC or  DWTFSB serves  as
Trustee  or  the 401(k)  Support Services  Group of  DWR serves  as recordkeeper
("Eligible Plan"),  provided that  either:   (A)  the plan  continues to  be  an
Eligible Plan after the redemption; or  (B) the redemption is in connection with
the  complete termination  of the  plan involving  the distribution  of all plan
assets to participants.
 
    With reference to (1) above, for the purpose of determining disability,  the
Distributor  utilizes the definition of disability contained in Section 72(m)(7)
of the  Internal Revenue  Code, which  relates  to the  inability to  engage  in
gainful  employment. With reference  to (2) above,  the term "distribution" does
not encompass a direct transfer of  IRA, 403(b) Custodial Account or  retirement
plan  assets to a  successor custodian or  trustee. All waivers  will be granted
only following receipt by the  Distributor of confirmation of the  shareholder's
entitlement.
 
CONVERSION  TO CLASS A  SHARES.  All shares  of the Fund held  prior to July 28,
1997 (other than shares which  were purchased prior to  July 2, 1984 (and,  with
respect  to such  shares, including such  proportion of  shares acquired through
reinvestment of dividends and capital gains distributions as the total number of
shares acquired prior  to such date  bears to  the total number  of Fund  shares
purchased  and  owned by  a shareholder  (collectively,  the "Old  Shares")) and
shares held  by  certain employee  benefit  plans  established by  DWR  and  its
affiliate,  SPS Transaction Services, Inc.) have been designated Class B shares.
Shares held before May  1, 1997 that  have been designated  Class B shares  will
convert  to Class A shares  in May, 2007. In all  other instances Class B shares
will convert automatically to  Class A shares, based  on the relative net  asset
values  of the shares of  the two Classes on the  conversion date, which will be
approximately ten (10) years  after the date of  the original purchase. The  ten
year  period is calculated  from the last day  of the month  in which the shares
were purchased or, in the case of Class B shares acquired through an exchange or
a series of  exchanges, from the  last day of  the month in  which the  original
Class  B shares were purchased, provided that shares originally purchased before
May 1, 1997  will convert  to Class  A shares in  May, 2007.  The conversion  of
shares  purchased on or after May 1, 1997 will take place in the month following
the tenth anniversary of the purchase. There will also be converted at that time
such proportion of  Class B  shares acquired through  automatic reinvestment  of
dividends  and distributions owned by the shareholder as the total number of his
or her  Class B  shares converting  at the  time bears  to the  total number  of
 
14
<PAGE>
outstanding  Class B shares purchased and owned  by the shareholder. In the case
of Class  B  shares held  by  a 401(k)  plan  or other  employer-sponsored  plan
qualified  under Section 401(a) of the Internal  Revenue Code and for which DWTC
or DWTFSB serves as Trustee or the  401(k) Support Services Group of DWR  serves
as recordkeeper, the plan is treated as a single investor and all Class B shares
will  convert to Class A shares on the  conversion date of the first shares of a
Dean Witter Multi-Class  Fund purchased by  that plan.  In the case  of Class  B
shares  previously exchanged for shares of  an "Exchange Fund" (see "Shareholder
Services--Exchange Privilege"), the period of time  the shares were held in  the
Exchange  Fund (calculated from the last day  of the month in which the Exchange
Fund shares were acquired) is excluded  from the holding period for  conversion.
If  those shares  are subsequently  re-exchanged for  Class B  shares of  a Dean
Witter Multi-Class Fund, the holding period resumes on the last day of the month
in which Class B shares are reacquired.
 
    If a shareholder has  received share certificates for  Class B shares,  such
certificates  must be delivered to the Transfer Agent at least one week prior to
the date for conversion. Class B shares evidenced by share certificates that are
not received by the  Transfer Agent at  least one week  prior to any  conversion
date will be converted into Class A shares on the next scheduled conversion date
after such certificates are received.
 
    Effectiveness  of  the  conversion  feature  is  subject  to  the continuing
availability of  a ruling  of the  Internal  Revenue Service  or an  opinion  of
counsel  that (i) the conversion  of shares does not  constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion will
have a basis equal to  the shareholder's basis in  the converted Class B  shares
immediately  prior  to the  conversion,  and (iii)  Class  A shares  received on
conversion will have a  holding period that includes  the holding period of  the
converted  Class B shares. The conversion feature may be suspended if the ruling
or opinion is no longer available. In such event, Class B shares would  continue
to be subject to Class B 12b-1 fees.
 
    Class  B shares purchased before  July 28, 1997 by  trusts for which DWTC or
DWTFSB provides discretionary trustee services will convert to Class A shares on
or about August 29, 1997. The CDSC will not be applicable to such shares.
 
LEVEL LOAD ALTERNATIVE--
CLASS C SHARES
 
Class C shares are sold  at net asset value  next determined without an  initial
sales  charge but are subject to a CDSC  of 1.0% on most redemptions made within
one year after purchase (calculated from the last day of the month in which  the
shares  were purchased).  The CDSC will  be assessed  on an amount  equal to the
lesser of the current market value or the cost of the shares being redeemed. The
CDSC will not be  imposed in the  circumstances set forth  above in the  section
"Contingent  Deferred Sales Charge Alternative--  Class B Shares--CDSC Waivers,"
except that the references to six years  in the first paragraph of that  section
shall mean one year in the case of Class C shares. Class C shares are subject to
an  annual 12b-1 fee of up to 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 Directors and regulatory limitations.
 
NO LOAD ALTERNATIVE--
CLASS D SHARES
 
Class  D shares are offered  without any sales charge  on purchase or redemption
and without any 12b-1 fee. Class D shares are offered only to investors  meeting
an  initial investment  minimum of  $5 million  and the  following categories of
investors: (i) investors  participating in  the InterCapital  mutual fund  asset
allocation  program pursuant to which such persons  pay an asset based fee; (ii)
persons participating  in  a  fee-based program  approved  by  the  Distributor,
pursuant to which such persons pay an asset based fee for services in the nature
of  investment advisory or administrative services  (subject to all of the terms
and conditions  of  such  programs,  which  may  include  termination  fees  and
restrictions  on transferability of Fund shares); (iii) 401(k) plans established
by DWR  and SPS  Transaction Services,  Inc.  (an affiliate  of DWR)  for  their
employees;  (iv) certain  Unit Investment Trusts  sponsored by  DWR; (v) certain
other  open-end  investment  companies  whose  shares  are  distributed  by  the
Distributor;  and (vi) other  categories of investors, at  the discretion of the
Board, as disclosed in the then current  prospectus of the Fund. The Old  Shares
and  shares held by the employee benefit plans referred to in clause (iii) above
prior to  July 28,  1997 have  been  designated Class  D shares.  Investors  who
require  a $5 million minimum initial investment  to qualify to purchase Class D
shares may  satisfy  that requirement  by  investing  that amount  in  a  single
transaction  in Class  D shares  of the Fund  and other  Dean Witter Multi-Class
Funds, subject to the $1,000 minimum initial investment required for that  Class
of  the Fund.  In addition, for  the purpose  of meeting the  $5 million minimum
investment amount, holdings  of Class A  shares in all  Dean Witter  Multi-Class
Funds, shares of FSC Funds and shares of Dean Witter Funds for which such shares
have  been  exchanged  will be  included  together with  the  current investment
amount. If a shareholder  redeems Class A shares  and purchases Class D  shares,
such redemption may be a taxable event.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
with  respect to the distribution of Class A,  Class B and Class C shares of the
Fund. In the case
 
                                                                              15
<PAGE>
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 Plan on July 2,
1984 (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 Plan's  inception upon  which  a CDSC  has been  imposed  or
waived,  or (b) the average daily net assets  of Class B attributable to Class B
shares issued, net of related shares redeemed, since inception of the Plan.  The
fee  is treated by the Fund as an expense in the year it is accrued. In the case
of Class A shares, the entire amount  of the fee currently represents a  service
fee  within the meaning of the NASD guidelines. In the case of Class B and Class
C shares, a portion of the fee payable  pursuant to the Plan, equal to 0.25%  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 DWR's account executives
and others  who engage  in or  support  distribution of  shares or  who  service
shareholder  accounts, including  overhead and telephone  expenses; printing and
distribution of prospectuses and reports used in connection with the offering of
the Fund's shares to other than current shareholders; and preparation,  printing
and distribution of sales literature and advertising materials. In addition, the
Distributor  may utilize fees paid  pursuant to the Plan in  the case of Class B
shares to compensate DWR and other Selected Broker-Dealers for their opportunity
costs in advancing such amounts,  which compensation would be  in the form of  a
carrying charge on any unreimbursed expenses.
 
    For  the fiscal  year ended February  28, 1997,  Class B shares  of the Fund
accrued payments under the Plan amounting to $81,976,079, which amount is  equal
to  0.74%  of the  Fund's  average daily  net assets  for  the fiscal  year. The
payments accrued under the  Plan were calculated pursuant  to clause (a) of  the
compensation  formula under  the Plan.  All shares held  prior to  July 28, 1997
(other than the  Old Shares and  shares held by  certain employee benefit  plans
established  by DWR and its affiliate, SPS Transaction Services, Inc.) have been
designated Class B shares.
 
    In the  case  of  Class  B  shares, at  any  given  time,  the  expenses  in
distributing Class B shares of the Fund may be in excess of the total of (i) the
payments  made by the Fund pursuant to the  Plan, and (ii) the proceeds of CDSCs
paid by investors  upon the redemption  of Class  B shares. For  example, if  $1
million in expenses in distributing Class B shares of the Fund had been incurred
and  $750,000 had been received  as described in (i)  and (ii) above, the excess
expense would amount to $250,000. The Distributor has advised the Fund that such
excess  amounts,  including  the  carrying  charge  described  above,   totalled
$221,826,761 at February 28, 1997, which was equal to 1.72% of the net assets of
the  Fund on such date. Because there is  no requirement under the Plan that the
Distributor be reimbursed for all distribution expenses or any requirement  that
the  Plan be continued from year to year, such excess amount does not constitute
a liability of the Fund. Although there  is no legal obligation for the Fund  to
pay  expenses incurred in excess  of payments made to  the Distributor under the
Plan, and the proceeds of CDSCs paid by investors upon redemption of shares,  if
for  any reason the Plan is terminated  the Directors 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 account executives at the time of sale may be
reimbursed  in  the subsequent  calendar year.  No  interest or  other financing
charges will  be  incurred on  any  Class A  or  Class C  distribution  expenses
incurred  by the Distributor under the Plan  or on any unreimbursed expenses due
to the Distributor pursuant to the Plan.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per  share is determined once daily  at 4:00 p.m., New  York
time (or, on days when the New York Stock Exchange closes prior to 4:00 p.m., at
such  earlier time),  on each day  that the New  York Stock Exchange  is open by
taking 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.
 
16
<PAGE>
    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
stock exchange is valued  at its latest  sale price on  that exchange; 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   Directors);   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 Fund's
Directors (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 Directors
determine such does  not reflect  the securities'  market value,  in which  case
these  securities  will be  valued  at their  fair  value as  determined  by the
Directors.
 
    Certain securities  in the  Fund's portfolio  may be  valued by  an  outside
pricing  service  approved  by the  Fund's  Directors. The  pricing  service may
utilize a matrix system incorporating  security quality, maturity and coupon  as
the  evaluation  model parameters,  and/or  research evaluations  by  its staff,
including review of broker-dealer market  price quotations, in determining  what
it  believes is the  fair valuation of  the portfolio securities  valued by such
pricing service.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC INVESTMENT OF DIVIDENDS AND  DISTRIBUTIONS.  All income dividends  and
capital gains distributions are automatically paid in full and fractional shares
of  the applicable Class  of the Fund  (or, if specified  by the shareholder, in
shares of any other open-end Dean Witter Fund), unless the shareholder  requests
that  they be paid in  cash. Shares so acquired are  acquired at net asset value
and are not subject to the imposition of a front-end sales charge or a CDSC (see
"Redemptions and Repurchases").
 
EASYINVEST.-SM-  Shareholders may subscribe to EasyInvest, an automatic purchase
plan which  provides  for any  amount  from $100  to  $5,000 to  be  transferred
automatically  from a  checking or savings  account, or  following redemption of
shares of  a  Dean Witter  money  market fund,  on  a semi-monthly,  monthly  or
quarterly basis, to the Transfer Agent for investment in shares of the Fund (see
"Purchase   of  Fund  Shares"   and  "Redemptions  and  Repurchases--Involuntary
Redemption").
 
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  who own or  purchase shares  of the  Fund
having  a minimum value of $10,000 based  upon the then current net asset value.
The Withdrawal Plan provides  for monthly or  quarterly (March, June,  September
and  December)  checks  in  any amount,  not  less  than $25,  or  in  any whole
percentage of the account balance, on  an annualized basis. Any applicable  CDSC
will  be imposed on shares redeemed under  the Withdrawal Plan (see "Purchase of
Fund Shares"). Therefore, any shareholder  participating in the Withdrawal  Plan
will  have  sufficient shares  redeemed  from his  or  her account  so  that the
proceeds (net of any applicable CDSC) to the shareholder will be the  designated
monthly  or quarterly amount. Withdrawal Plan  payments should not be considered
as  dividends,  yields   or  income.  If   periodic  withdrawal  plan   payments
continuously   exceed  net  investment   income  and  net   capital  gains,  the
shareholder's original investment will be correspondingly reduced and ultimately
exhausted. Each withdrawal constitutes  a redemption of shares  and any gain  or
loss realized must be recognized for Federal income tax purposes.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
TAX SHELTERED RETIREMENT PLANS.  Retirement plans are available through DWR  for
use  by corporations, the self-employed, eligible Individual Retirement Accounts
and Custodial Accounts  under Section  403(b)(7) of the  Internal Revenue  Code.
Adoption of such plans should be on advice of legal counsel or tax adviser.
 
    For  further information  regarding plan administration,  custodial fees and
other details, investors should contact their account executive or the  Transfer
Agent.
 
                                                                              17
<PAGE>
EXCHANGE PRIVILEGE
 
Shares  of each Class may be exchanged for shares of the same Class of any other
Dean Witter Multi-Class Fund without the imposition of any exchange fee.  Shares
may  also be exchanged for shares of the following funds: Dean Witter Short-Term
U.S. Treasury  Trust, Dean  Witter  Limited Term  Municipal Trust,  Dean  Witter
Short-Term Bond Fund, Dean Witter Intermediate Term U.S. Treasury Trust and five
Dean  Witter funds which are money market  funds (the "Exchange Funds"). Class A
shares may also  be exchanged for  shares of Dean  Witter Multi-State  Municipal
Series Trust and Dean Witter Hawaii Municipal Trust, which are Dean Witter Funds
sold  with a front-end  sales charge ("FSC  Funds"). Class B  shares may also be
exchanged for shares  of Dean Witter  Global Short-Term Income  Fund Inc.,  Dean
Witter  High Income Securities  and Dean Witter  National Municipal Trust, which
are Dean Witter Funds offered with a CDSC ("CDSC Funds"). Exchanges may be  made
after  the shares of the Fund acquired  by purchase (not by exchange or dividend
reinvestment) have been  held for thirty  days. There is  no waiting period  for
exchanges of shares acquired by exchange or dividend reinvestment.
 
    An  exchange to another Dean Witter Multi-Class Fund, any FSC Fund, any CDSC
Fund or any Exchange Fund that is not a money market fund is on the basis of the
next calculated net asset value per share of each fund after the exchange  order
is  received. When exchanging into a money  market fund from the Fund, shares of
the Fund are redeemed out of the  Fund at their next calculated net asset  value
and  the proceeds  of the redemption  are used  to purchase shares  of the money
market fund at  their net  asset value  determined the  following business  day.
Subsequent  exchanges between any of the money  market funds and any of the Dean
Witter Multi-Class Funds, FSC Funds or CDSC  Funds or any Exchange Fund that  is
not a money market fund can be effected on the same basis.
 
    No  CDSC is  imposed at  the time  of any  exchange of  shares, although any
applicable CDSC will be imposed upon  ultimate redemption. During the period  of
time  the shareholder remains in an Exchange  Fund (calculated from the last day
of the  month in  which the  Exchange Fund  shares were  acquired), the  holding
period (for the purpose of determining the rate of the CDSC) is frozen. If those
shares  are subsequently  re-exchanged for shares  of a  Dean Witter Multi-Class
Fund or shares of  a CDSC Fund,  the holding period  previously frozen when  the
first  exchange was made resumes on the last day of the month in which shares of
a Dean Witter Multi-Class Fund  or shares of a  CDSC Fund are reacquired.  Thus,
the  CDSC is based upon the time (calculated as described above) the shareholder
was invested in shares of a Dean Witter Multi-Class Fund or in shares of a  CDSC
Fund (see "Purchase of Fund Shares"). In the case of exchanges of Class A shares
which  are  subject  to  a  CDSC, the  holding  period  also  includes  the time
(calculated as described above) the shareholder was invested in shares of a  FSC
Fund. However, in the case of shares exchanged into an Exchange Fund on or after
April  23,  1990, upon  a redemption  of shares  which results  in a  CDSC being
imposed, a credit (not  to exceed the amount  of the CDSC) will  be given in  an
amount  equal to the Exchange Fund 12b-1  distribution fees incurred on or after
that  date  which  are  attributable  to  those  shares.  (Exchange  Fund  12b-1
distribution  fees are described  in the prospectuses for  those funds.) Class B
shares of the  Fund acquired  in exchange  for Class  B shares  of another  Dean
Witter  Multi-Class  Fund or  shares  of a  CDSC  Fund having  a  different CDSC
schedule than that of  this Fund will  be subject to  the higher CDSC  schedule,
even  if such shares are  subsequently re-exchanged for shares  of the fund with
the lower CDSC schedule.
 
ADDITIONAL INFORMATION REGARDING EXCHANGES.   Purchases and exchanges should  be
made for investment purposes only. A pattern of frequent exchanges may be deemed
by  the Investment Manager to  be abusive and contrary  to the best interests of
the Fund's other shareholders and,  at the Investment Manager's discretion,  may
be limited by the Fund's refusal to accept additional purchases and/or exchanges
from  the investor. Although the  Fund does not have  any specific definition of
what constitutes a pattern of frequent exchanges, and will consider all relevant
factors in determining whether a particular situation is abusive and contrary to
the best interests of the Fund  and its other shareholders, investors should  be
aware  that  the Fund  and each  of the  other  Dean Witter  Funds may  in their
discretion limit  or  otherwise  restrict  the number  of  times  this  Exchange
Privilege may be exercised by any investor. Any such restriction will be made by
the  Fund on a prospective basis only,  upon notice to the shareholder not later
than ten days following such shareholder's most recent exchange.
 
    The Exchange Privilege may be terminated or revised at any time by the  Fund
and/or  any  of such  Dean Witter  Funds for  which  shares of  the Fund  may be
exchanged, upon  such  notice  as  may  be  required  by  applicable  regulatory
agencies.  Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions  on
exchange of shares of the Fund pledged in the margin account.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and shareholders should obtain one 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
 
18
<PAGE>
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 broker-dealer  of
record and its account numbers are part of the account information, shareholders
may  initiate an exchange  of shares of the  Fund for shares of  any of the Dean
Witter Funds (for which  the Exchange Privilege is  available) pursuant to  this
Exchange  Privilege by contacting their account executive (no Exchange Privilege
Authorization Form is required). Other shareholders (and those shareholders  who
are  clients of  DWR or  another 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 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
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 will 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  account executive, if
appropriate, or make a written  exchange request. Shareholders are advised  that
during  periods of drastic economic  or market changes, it  is possible that the
telephone exchange procedures may be  difficult to implement, although this  has
not been the case with the Dean Witter Funds in the past.
 
    For  further  information  concerning the  Exchange  Privilege, shareholders
should contact their DWR  or other Selected  Broker-Dealer account executive  or
the Transfer Agent.
 
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 Investment 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
or telegraphic request of the shareholder. The repurchase price is the net asset
value next  determined (see  "Purchase of  Fund Shares")  after such  repurchase
order  is  received  by DWR  or  other  Selected Broker-Dealer,  reduced  by any
applicable CDSC.
 
    The CDSC, if any, will be the only fee imposed by the Fund, the Distributor,
or DWR or other Selected Broker-Dealer.  The offer by the Distributor and  other
Selected  Broker-Dealers to repurchase shares may be suspended without notice by
the Distributor at any time. In that event, shareholders may redeem their shares
through the Fund's Transfer Agent as set forth above under "Redemption".
 
PAYMENT FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented  for
repurchase  or redemption will be made by  check within seven days after receipt
by the Transfer Agent of the  certificate and/or written request in good  order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances;  E.G., when normal  trading is not  taking place on  the New York
Stock Exchange. If  the shares to  be redeemed have  recently been purchased  by
check,  payment of the redemption  proceeds may be delayed  for the minimum time
needed to verify that the check used  for investment has been honored (not  more
than  fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders  maintaining  margin   accounts  with  DWR   or  another   Selected
Broker-Dealer  are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
REINSTATEMENT PRIVILEGE.  A shareholder who  has had his or her shares  redeemed
or  repurchased and  has not  previously exercised  this reinstatement privilege
may, within 35 days  after the date of  the redemption or repurchase,  reinstate
any portion or all of the proceeds of such redemption or repurchase in shares of
the  Fund in the same Class from  which such shares were redeemed or repurchased
at their net asset value next determined after a reinstatement request, together
with the proceeds, is received by the
 
                                                                              19
<PAGE>
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 to redeem, upon sixty days'
notice  and at net asset value, the shares of any shareholder (other than shares
held in  an Individual  Retirement Account  or Custodial  Account under  Section
403(b)(7)  of the Internal Revenue Code) whose  shares have a value of less than
$100, or such lesser amount as may be fixed by the Fund's Board of Directors or,
in the case of an account opened through EasyInvest-SM-, if after twelve  months
the  shareholder has invested  less than $1,000 in  the account. However, before
the Fund redeems such shares and sends the proceeds to the shareholder, it  will
notify  the shareholder that the value of the shares is less than the applicable
amount and allow the shareholder sixty days to make an additional investment  in
an  amount  which  will  increase the  value  of  the 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 pay quarterly income dividends and to distribute
net short-term and long-term capital gains, if any, at least once per year.  The
Fund  may, however, determine either  to distribute or to  retain all or part of
any long-term 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 will be automatically credited to the shareholder's
account without issuance of a share certificate unless the shareholder  requests
in  writing that all dividends be paid  in cash. Shares acquired by dividend and
distribution reinvestments will not be subject to any front-end sales charge  or
CDSC.  Class B shares  acquired through dividend  and distribution reinvestments
will become eligible  for conversion  to Class  A shares  on a  pro rata  basis.
Distributions paid on Class A and Class D shares will be higher than for Class B
and  Class C shares because distribution fees paid by Class B and Class C shares
are higher. (See  "Shareholder Services--Automatic Investment  of Dividends  and
Distributions.")
 
TAXES.   Because the Fund intends to distribute all of its net investment income
and net  short-term capital  gains to  shareholders and  remain qualified  as  a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is  not expected that the Fund will be required to pay any federal income tax on
such income and capital  gains. Shareholders will normally  have to pay  Federal
income  taxes, and  any state income  taxes, on the  dividends and distributions
they receive from the Fund. Such dividends and distributions, to the extent that
they are derived from net investment income or 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.  Any
dividends  declared in the last  quarter of any calendar  year which are paid in
the following  calendar  year  prior to  February  1  will be  deemed,  for  tax
purposes,  to have been received by the  shareholder in the prior year. Dividend
distributions will  be eligible  for the  Federal dividends  received  deduction
available  to the Fund's corporate shareholders only to the extent the aggregate
dividends received by the Fund would be  eligible for the deduction if the  Fund
were  the shareholder claiming the dividends received deduction. In this regard,
a 46-day holding period generally must be met.
 
    Distributions of  net  long-term  capital  gains, if  any,  are  taxable  to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional  shares or in cash. Capital  gains distributions are not eligible for
the dividends received deduction.
 
    The Fund 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 year,  shareholders will be  sent full information  on
their  dividends  and capital  gains distributions  for tax  purposes, including
information as to the portion taxable as ordinary income, the portion taxable as
capital gains, and the  amount of dividends eligible  for the Federal  dividends
received  deduction available to  corporations. To avoid being  subject to a 31%
Federal backup withholding tax on taxable dividends, capital gains distributions
and  the  proceeds  of  redemptions  and  repurchases,  shareholders'   taxpayer
identification numbers must be furnished and certified as to their accuracy.
 
    Shareholders  should consult their  tax advisers as  to the applicability of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From time to time the  Fund may quote its  "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
 
20
<PAGE>
to  a figure reflecting the average annualized percentage increase (or decrease)
in the value  of an initial  investment in a  Class of the  Fund of $1,000  over
periods  of one, five  and ten years.  Average annual total  return reflects all
income earned  by the  Fund,  any appreciation  or  depreciation of  the  Fund's
assets,  all expenses  incurred by  the applicable  Class and  all sales charges
which would be incurred by 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  a
hypothetical  investment of $10,000, $50,000 or $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.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING  RIGHTS.  All shares of  common stock 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.
 
    Under ordinary circumstances, the Fund is not required, nor does it  intend,
to hold Annual Meetings of Shareholders. The Directors may call Special Meetings
of  Shareholders for action by shareholder vote as may be required by the Act or
the Fund's By-Laws.
 
CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean  Witter
Services Company Inc. and the Distributor are subject to a strict Code of Ethics
adopted  by those companies. The  Code of Ethics is  intended to ensure that the
interests of shareholders  and other clients  are placed ahead  of any  personal
interest,  that no undue personal benefit is obtained from a person's employment
activities and that actual and potential  conflicts of interest are avoided.  To
achieve  these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an  advance clearance process to monitor that  no
Dean  Witter Fund is engaged at the same time  in a purchase or sale of the same
security. The  Code of  Ethics bans  the purchase  of securities  in an  initial
public  offering and prohibits engaging in  futures and options transactions and
profiting on short-term trading (that is, a purchase within sixty days of a sale
or a  sale  within  sixty days  of  a  purchase) of  a  security.  In  addition,
investment  personnel may  not purchase  or sell  a security  for their personal
account within thirty days  before or after any  transaction in any Dean  Witter
Fund  managed  by them.  Any violations  of the  Code of  Ethics are  subject to
sanctions,  including  reprimand,  demotion  or  suspension  or  termination  of
employment.  The Code  of Ethics comports  with regulatory  requirements and the
recommendations in the 1994 report by the Investment Company Institute  Advisory
Group on Personal Investing.
 
MASTER/FEEDER  CONVERSION.  The Fund  reserves the right to  seek to achieve its
investment objective by investing all of its investable assets in a diversified,
open-end management investment company having the same investment objective  and
policies  and substantially the same investment restrictions as those applicable
to the Fund.
 
SHAREHOLDER INQUIRIES.  All inquiries regarding  the Fund should be directed  to
the  Fund at the  telephone numbers or address  set forth on  the front cover of
this Prospectus.
 
                                                                              21
<PAGE>
DEAN WITTER
DIVIDEND GROWTH SECURITIES INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
BOARD OF DIRECTORS
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Barry Fink
Vice President, Secretary and
General Counsel
Paul D. Vance
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.


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