TCW DW BALANCED FUND
497, 1997-07-31
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<PAGE>
   [LOGO]
                      BALANCED FUND
 
                           PROSPECTUS
                           JULY 28, 1997
 
TCW/DW Balanced Fund (the "Fund") is an open-end, diversified management
investment company, whose investment objective is to achieve high total return
through a combination of income and capital appreciation. The Fund seeks to
achieve its investment objective by investing in a diversified portfolio of
common stocks and investment grade fixed-income securities. 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 C 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 OF CONTENTS
Prospectus Summary 2
Summary of Fund Expenses 4
Financial Highlights 5
The Fund and its Management 6
Investment Objective and Policies 6
  Special Risk Considerations 7
Investment Restrictions 11
Purchase of Fund Shares 11
Shareholder Services 19
Repurchases and Redemptions 20
Dividends, Distributions and Taxes 21
Performance Information 22
Additional Information 22
 
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.
 
         TCW/DW BALANCED FUND
         Two World Trade Center
         New York, New York 10048
         (212) 392-2550 or
         (800) 869-NEWS (toll-free)
 
            Dean Witter Distributors Inc.
 
            Distributor
 
    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.
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>                   <C>
THE                   The Fund is organized as a Trust, commonly known as a Massachusetts business trust,
FUND                  and is an open- end, diversified management investment company investing in a
                      diversified portfolio of common stocks and investment grade fixed-income securities.
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SHARES                Shares of beneficial interest with $0.01 par value (see page 22). The Fund offers four
OFFERED               Classes of Shares, each with a different combination of sales charges, ongoing fees
                      and other features (see pages 11-18).
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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 concurrent investments in Class D shares of the Fund
                      and other multiple class funds for which Dean Witter Services Company Inc. serves as
                      manager and TCW Funds Management, Inc. serves as investment adviser will be
                      aggregated. The minimum subsequent investment is $100 (see page 11).
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INVESTMENT            The investment objective of the Fund is to achieve high total return through a
OBJECTIVE             combination of income and capital appreciation. (see page 6)
- ---------------------------------------------------------------------------------------------------------
MANAGER               Dean Witter Services Company Inc. (the "Manager"), a wholly-owned subsidiary of Dean
                      Witter InterCapital Inc. ("InterCapital"), is the Fund's Manager. The Manager also
                      serves as Manager to thirteen other investment companies which are advised by TCW
                      Funds Management, Inc. (the "TCW/ DW Funds"). The Manager and InterCapital serve in
                      various investment management, advisory, management and administrative capacities to a
                      total of 100 investment companies and other portfolios with assets of approximately
                      $96.6 billion at June 30, 1997 (see page 6).
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ADVISER               TCW Funds Management, Inc. (the "Adviser") is the Fund's investment adviser. In
                      addition to the Fund, the Adviser serves as investment adviser to thirteen other
                      TCW/DW Funds. As of June 30, 1997, the Adviser and its affiliates had approximately
                      $50 billion under management or committed to management in various fiduciary or
                      advisory capacities, primarily from institutional investors (see page 6).
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MANAGEMENT            The Manager receives a monthly fee at the annual rate of 0.45% of daily net assets.
AND ADVISORY          The Adviser receives a monthly fee at an annual rate of 0.30% of daily net assets (see
FEES                  page 6).
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DISTRIBUTOR AND       Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution
DISTRIBUTION FEE      plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with
                      respect to the distribution fees paid by the Class A, Class B and Class C shares of
                      the Fund to the Distributor. The entire 12b-1 fee payable by Class A and a portion of
                      the 12b-1 fee payable by each of Class B and Class C equal to 0.25% 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 11 and 17).
- ---------------------------------------------------------------------------------------------------------
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 11, 12 and
                      17).
</TABLE>
 
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                                       2
<PAGE>
- --------------------------------------------------------------------------------
<TABLE>
<S>                   <C>
                      - Class B shares are offered without a front-end sales charge, but will in most cases
                      be subject to a CDSC (scaled down from 5.0% to 1.0%) if redeemed within six years
                      after purchase. The CDSC will be imposed on any redemption of shares if after such
                      redemption the aggregate current value of a Class B account with the Fund falls below
                      the aggregate amount of the investor's purchase payments made during the six years
                      preceding the redemption. A different CDSC schedule applies to investments by certain
                      qualified plans. Class B shares are also subject to a 12b-1 fee assessed at the annual
                      rate of 1.0% of the average daily net assets of Class B. Shares of the Fund held prior
                      to July 28, 1997 which were acquired in exchange for shares of TCW/DW Funds sold with
                      a CDSC, including shares acquired through reinvestment of dividends and distributions
                      thereon, 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 convert to Class A shares approximately ten years
                      after the date of the original purchase (see pages 11, 15 and 17).
 
                      - 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.
                      All shares of the Fund held prior to July 28, 1997 (other than shares which were
                      acquired in exchange for shares of TCW/DW Funds offered with a CDSC and shares
                      acquired through reinvestment of dividends and distributions thereon) have been
                      designated Class C shares. Shares held before July 28, 1997 that have been designated
                      Class C shares are not subject to the 1.0% CDSC (see pages 11 and 17).
 
                      - 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 11 and 17).
- ---------------------------------------------------------------------------------------------------------
DIVIDENDS             Income dividends are intended to be paid quarterly. Capital gains distributions, if
AND CAPITAL           any, will be paid at least annually. The Fund may, however, determine to retain all or
GAINS                 part of any net long-term capital gains in any year for reinvestment. Dividends and
DISTRIBUTIONS         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 19 and 21).
- ---------------------------------------------------------------------------------------------------------
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 20).
- ---------------------------------------------------------------------------------------------------------
RISK                  The net asset value of the Fund's shares will fluctuate with changes in the market
CONSIDERATIONS        value of the Fund's portfolio securities. The Fund may invest a portion of its assets
                      in mortgage-backed and asset-backed securities, including up to 5% of its net assets
                      in collateralized mortgage obligations. Mortgage-backed securities are subject to
                      special risks including prepayments or refinancings of the assets underlying such
                      securities which may have an impact on the yield and the net asset value of the Fund's
                      shares (see pages 8-9). The Fund may invest up to 25% of its total assets in
                      non-dollar denominated foreign securities, which may entail special risks (see page
                      8). The Fund also may enter into reverse repurchase agreements and dollar rolls, may
                      purchase securities on a when-issued, delayed delivery or "when, as and if issued"
                      basis and may enter into forward foreign currency exchange contracts, which involve
                      certain additional risks (see pages 9-11).
</TABLE>
 
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  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 September 30, 1996.
 
<TABLE>
<CAPTION>
                                                                                   CLASS A    CLASS B    CLASS C    CLASS D
                                                                                  ---------   -------   ---------   -------
<S>                                                                               <C>         <C>       <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price)...   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 and Advisory Fees....................................................   0.75%       0.75%     0.75%       0.75%
12b-1 Fees (5) (6)..............................................................   0.25%       1.00%     0.99%       None
Other Expenses..................................................................   0.40%       0.40%     0.40%       0.40%
Total Fund Operating Expenses (7)...............................................   1.40%       2.15%     2.14%       1.15%
</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 B 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...............................................................   $      66    $      94    $     125    $     212
    Class B...............................................................   $      72    $      97    $     135    $     248
    Class C...............................................................   $      32    $      67    $     115    $     247
    Class D...............................................................   $      12    $      37    $      63    $     140
 
You would pay the following expenses on the same $1,000 investment
 assuming no redemption at the end of the period:
    Class A...............................................................   $      66    $      94    $     125    $     212
    Class B...............................................................   $      22    $      67    $     115    $     248
    Class C...............................................................   $      22    $      67    $     115    $     247
    Class D...............................................................   $      12    $      37    $      63    $     140
</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" and "Purchase of Fund Shares -- Plan of
Distribution" and "Repurchases and Redemptions."
 
    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 per share data and ratios for a share of beneficial interest
outstanding throughout each of the periods through September 30, 1996 have been
audited by Price Waterhouse LLP, independent accountants. The information for
the six-month period ended March 31, 1997 is unaudited. The financial highlights
should be read in conjunction with the financial statements, notes thereto, and
the unqualified report of independent accountants, which are contained in the
Statement of Additional Information. Further information about the performance
of the Fund is contained in the Fund's Annual Report to Shareholders, which may
be obtained without charge upon request to the Fund. All shares of the Fund held
prior to July 28, 1997 (other than shares which were acquired in exchange for
shares of TCW/DW Funds offered with a CDSC and shares acquired through
reinvestment of dividends and distributions thereon) have been designated Class
C shares. Shares of the Fund held prior to July 28, 1997 which were acquired in
exchange for shares of TCW/DW Funds sold with a CDSC, including shares acquired
through reinvestment of dividends and distributions thereon, have been
designated Class B shares.
 
<TABLE>
<CAPTION>
                                         FOR THE
                                           SIX                                   FOR THE PERIOD
                                         MONTHS       FOR THE      FOR THE        OCTOBER 29,
                                          ENDED        YEAR         YEAR             1993*
                                          MARCH        ENDED        ENDED           THROUGH
                                           31,        SEPTEMBER    SEPTEMBER     SEPTEMBER 30,
                                          1997        30, 1996     30, 1995           1994
                                         -------      -------      -------      ----------------
<S>                                      <C>          <C>          <C>          <C>
                                         (UNAUDITED)
PER SHARE OPERATING PERFORMANCE:
  Net asset value, beginning of
   period..........................      $11.63       $10.46       $9.43            $ 10.00
                                         -------      -------      -------           ------
    Net investment income..........       0.05        0.15         0.20                0.10
    Net realized and unrealized
     gain (loss)...................      (0.11  )     1.12         0.93               (0.58)
                                         -------      -------      -------           ------
  Total from investment
   operations......................      (0.06  )     1.27         1.13               (0.48)
                                         -------      -------      -------           ------
  Less dividends:
    From net investment income.....      (0.05  )      --          (0.10  )           (0.09)
    In excess of net investment
     income........................       --          (0.10  )      --              --
                                         -------      -------      -------           ------
  Total dividends..................      (0.05  )     (0.10  )     (0.10  )           (0.09)
                                         -------      -------      -------           ------
  Net asset value, end of period...      $11.52       $11.63       $10.46           $  9.43
                                         -------      -------      -------           ------
                                         -------      -------      -------           ------
TOTAL INVESTMENT RETURN+...........      (0.44  )%(1) 12.20%       11.97%             (4.80)%(1)
 
RATIOS TO AVERAGE NET ASSETS:
  Expenses.........................       2.07%(2)    2.14%        2.11%               2.06%(2)
  Net investment income............       0.90%(2)    1.12%        1.88%               1.22%(2)
 
SUPPLEMENTAL DATA:
  Net assets, end of period, in
   thousands.......................      $86,693      $92,491      $106,716        $149,357
  Portfolio turnover rate..........         48%(1)     117%         123%                113%(1)
  Average commission rate paid.....      $0.0582      $0.0583       --              --
</TABLE>
 
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 *  COMMENCEMENT OF OPERATIONS.
 
 +  CALCULATED BASED ON THE NET ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE
    PERIOD.
 
(1) NOT ANNUALIZED.
 
(2) ANNUALIZED.
 
                                       5
<PAGE>
THE FUND AND ITS MANAGEMENT
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TCW/DW Balanced Fund (the "Fund") is an open-end, diversified management
investment company. The Fund is a trust of the type commonly known as a
"Massachusetts business trust" and was organized under the laws of Massachusetts
on March 2, 1993.
 
    Dean Witter Services Company Inc. (the "Manager"), whose address is Two
World Trade Center, New York, New York 10048, is the Fund's Manager. The Manager
is a wholly-owned subsidiary of Dean Witter InterCapital Inc. ("InterCapital").
InterCapital 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.
 
    The Manager acts as manager to thirteen other TCW/ DW Funds. The Manager and
InterCapital act in various investment management, advisory, management and
administrative capacities to a total of 100 investment companies, thirty of
which are listed on the New York Stock Exchange, with combined assets of
approximately $96.1 billion as of June 30, 1997. InterCapital also manages and
advises portfolios of pension plans, other institutions and individuals which
aggregated approximately $3.5 billion at such date.
 
    The Fund has retained the Manager to manage its business affairs, supervise
its overall day-to-day operations (other than providing investment advice) and
provide all administrative services.
 
    TCW Funds Management, Inc. (the "Adviser"), whose address is 865 South
Figueroa Street, Suite 1800, Los Angeles, California 90017, is the Fund's
investment adviser. The Adviser was organized in 1987 as a wholly-owned
subsidiary of The TCW Group, Inc. ("TCW"), whose subsidiaries, including Trust
Company of the West and TCW Asset Management Company, provide a variety of
trust, investment management and investment advisory services. Robert A. Day,
who is Chairman of the Board of Directors of TCW, may be deemed to be a control
person of the Adviser by virtue of the aggregate ownership by Mr. Day and his
family of more than 25% of the outstanding voting stock of TCW. The Adviser
serves as investment adviser to thirteen other TCW/DW Funds in addition to the
Fund. As of June 30, 1997, the Adviser and its affiliated companies had
approximately $50 billion under management or committed to management, primarily
from institutional investors.
 
    The Fund has retained the Adviser to invest the Fund's assets.
 
    The Fund's Trustees review the various services provided by the Manager and
the Adviser 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 Manager, the Fund pays the Manager
monthly compensation calculated daily by applying the annual rate of 0.45% to
the Fund's net assets. As compensation for its investment advisory services, the
Fund pays the Adviser monthly compensation calculated daily by applying an
annual rate of 0.30% to the Fund's net assets. The total of the management and
advisory fees paid by the Fund is higher than the advisory fees paid by most
other investment companies.
 
    For the fiscal year ended September 30, 1996, the Fund accrued to the
Manager and the Adviser total compensation amounting to 0.45% and 0.30%,
respectively, of the Fund's average daily net assets. During the period, the
Fund's total expenses amounted to 2.14% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is to achieve high total return through a
combination of income and capital appreciation. 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 obtain its objective by investing in a diversified
portfolio of common stocks and investment grade fixed-income securities. The
percentage of assets allocated between equity and fixed-income securities will
vary from time to time depending on the judgment of the Adviser as to general
economic and market conditions, changes in fiscal or monetary policies and
trends in yields and interest rates. However, under normal circumstances, it is
expected that common stocks will represent approximately 60-70% of the Fund's
total assets. In addition, the Fund under normal circumstances will maintain at
least 25% of its total assets in fixed-income securities.
 
    The investments in the equity portion of the Fund's portfolio are determined
pursuant to a "top down" investment process ranging from the overall economic
outlook, to the development of industry/sector preferences, and, last, to
specific stock selections. The following disciplines generally apply with regard
to stock selection of the equity component of the Fund's portfolio: (i) no
single issuer's equity securities will represent at the time of purchase more
than 5% of the Fund's total assets; and (ii) at least 95% of the companies
represented will have minimum market capitalizations at the time of purchase in
excess of $1 billion. Subject to the Fund's
 
                                       6
<PAGE>
investment objective, the Adviser may modify the foregoing disciplines without
notice.
 
    The fixed-income portion of the Fund's portfolio may consist of securities
issued or guaranteed by the U.S. Government (Treasury bills, notes and bonds),
investment grade corporate debt securities (including convertible securities),
mortgage-backed and asset-backed securities and money market securities (as
described below). All fixed-income securities in which the Fund invests will be
either issued or guaranteed by the U.S. Government, its agencies or
instrumentalities or rated at least BBB by Standard & Poor's Corporation ("S&P")
or Baa by Moody's Investors Service, Inc. ("Moody's") or, if not rated,
determined by the Adviser to be of comparable quality.
 
    Under normal circumstances, no more than 10% of the fixed-income portion of
the Fund's portfolio will be rated BBB by S&P or Baa by Moody's. Fixed-income
securities rated BBB by S&P or Baa by Moody's, which generally are regarded as
having an adequate capacity to pay interest and repay principal, have
speculative characteristics. Thus, changes in economic conditions are more
likely to lead to a weakened capacity to make principal and interest payments
than is the case with respect to higher rated securities. If a fixed-income
security held by the Fund is rated BBB or Baa and is subsequently downgraded by
a rating agency, the Fund will retain such security in its portfolio until the
Adviser 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 net assets, the Adviser will seek
to sell immediately sufficient securities to reduce the total to below 5%. A
description of fixed-income securities ratings is contained in the Appendix to
the Statement of Additional Information.
 
PORTFOLIO CHARACTERISTICS
 
Although the Fund will invest primarily in equity securities and fixed-income
corporate debt securities, it may engage to a limited extent in certain
specialized investments and investment techniques which are described below.
 
    MORTGAGE-BACKED AND ASSET-BACKED SECURITIES.  As stated above, the Fund may
invest in fixed-rate and adjustable-rate mortgage-backed securities
("Mortgage-Backed Securities").
 
    There are currently three basic types of Mortgage-Backed Securities: (i)
those issued or guaranteed by the United States Government or one of its
agencies or instrumentalities, such as the Government National Mortgage
Association ("GNMA"), the Federal National Mortgage Association ("FNMA") and the
Federal Home Loan Mortgage Corporation ("FHLMC") (securities issued by GNMA, but
not those issued by FNMA or FHLMC, are backed by the "full faith and credit" of
the United States); (ii) those issued by private issuers that represent an
interest in or are collateralized by Mortgage-Backed Securities issued or
guaranteed by the United States Government or one of its agencies or
instrumentalities; and (iii) those issued by private issuers that represent an
interest in or are collateralized by whole mortgage loans or Mortgage-Backed
Securities without a government guarantee but usually having some form of
private credit enhancement. The Fund may also invest in adjustable-rate mortgage
securities, which are pass-through mortgage securities collateralized by
mortgages with adjustable rather than fixed rates.
 
    The Fund may also invest up to 5% of its net assets in collateralized
mortgage obligations ("CMOs"), which are debt obligations collateralized by
mortgage loans or mortgage pass-through securities. Typically, CMOs are
collateralized by GNMA, FNMA or FHLMC Certificates, but also may be
collateralized by whole loans or private mortgage pass-through securities. Types
of CMOs in which the Fund may invest may be issued either by the U.S. Government
or by private issuers.
 
    The Fund may also invest in other asset-backed securities ("Asset-Backed
Securities"), which involve use of the securitization techniques utilized in
connection with Mortgage-Backed Securities in connection with other assets,
primarily automobile and credit card receivables and home equity loans.
 
    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 based on a specified 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, may 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.
 
SPECIAL RISK CONSIDERATIONS
 
The net asset value of the Fund's shares will fluctuate with changes in the
market value of the Fund's portfolio securities.
 
                                       7
<PAGE>
The market value of the Fund's portfolio securities will increase or decrease
due to a variety of economic, market and political factors, including movements
in interest rates, which cannot be predicted.
 
    FOREIGN SECURITIES.  The Fund may invest in securities of foreign companies.
The Fund will not invest more than 25% of the value of its total assets, at the
time of purchase, in non-dollar denominated foreign securities (other than
securities of Canadian issuers registered under the Securities Exchange Act of
1934 or American Depository Receipts, on which there is no such limit). The
Fund's investments in unlisted foreign securities are subject to the Fund's
overall policy limiting its investment in illiquid securities to 15% or less of
its net assets. The Fund currently does not intend to invest more than 25% of
its total assets in the securities of issuers in any one country outside the
United States.
 
    Foreign securities investments may be affected by changes in currency rates
or exchange control regulations, changes in governmental administration or
economic or monetary policy (in the United States and abroad) or changed
circumstances in dealings between nations. Fluctuations in the relative rates of
exchange between the currencies of different nations will affect the value of
the Fund's investments denominated in foreign currency. Changes in foreign
currency exchange rates relative to the U.S. dollar will affect the U.S. dollar
value of the Fund's assets denominated in that currency and thereby impact upon
the Fund's total return on such assets.
 
    Investments in foreign securities will also occasion risks relating to
political and economic developments abroad, including the possibility of
expropriations or confiscatory taxation, limitations on the use or transfer of
Fund assets and any effects of foreign social, economic or political
instability. Foreign companies are not subject to the regulatory requirements of
U.S. companies and, as such, there may be less publicly available information
about such companies. Moreover, foreign companies are not subject to uniform
accounting, auditing and financial reporting standards and requirements
comparable to those applicable to U.S. companies.
 
    Securities of foreign issuers may be less liquid than comparable securities
of U.S. issuers and, as such, their price changes may be more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to less
government and exchange scrutiny and regulation than their American
counterparts. Brokerage commissions, dealer concessions and other transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements of the Fund's trades effected in such markets. As such, the
inability to dispose of portfolio securities due to settlement delays could
result in losses to the Fund due to subsequent declines in value of such
securities and the inability of the Fund to make intended security purchases due
to settlement problems could result in a failure of the Fund to make potentially
advantageous investments.
 
    The Fund may also invest up to 5% of its net assets in a type of Mexican
government money market securities known as Cetes, which are peso-denominated
discount debt securities having maturities of one year or less that are sold
through auctions regulated by Banco de Mexico. The Fund will invest in Cetes
only if they meet the rating standards for the fixed-income portion of the
Fund's portfolio.
 
    MORTGAGE-BACKED AND ASSET-BACKED 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 decline, and when interest rates fall,
prices rise.
 
    Mortgage-Backed and Asset-Backed Securities have certain different
characteristics than traditional debt securities. Among the major differences
are that interest and principal payments are made more frequently, usually
monthly, and that principal may be prepaid at any time because the underlying
mortgage loans or other assets generally may be prepaid at any time. As a
result, if the Fund purchases such a security at a premium, a prepayment rate
that is faster than expected may reduce yield to maturity, while a prepayment
rate that is slower than expected may have the opposite effect of increasing
yield to maturity. Alternatively, if the Fund purchases these securities at a
discount, faster than expected prepayments will increase, while slower than
expected prepayments may reduce, yield to maturity.
 
    Mortgage-Backed and Asset-Backed Securities, like all fixed income
securities, generally decrease in value as a result of increases in interest
rates. In addition, although generally the value of fixed-income securities
increases during periods of falling interest rates and, as stated above,
decreases during periods of rising interest rates, as a result of prepayments
and other factors, this is not always the case with respect to Mortgage-Backed
and Asset-Backed Securities.
 
    Although the extent of prepayments on a pool of mortgage loans depends on
various economic and other factors, as a general rule prepayments on fixed rate
mortgage loans will increase during a period of falling interest rates and
decrease during a period of rising interest rates. Accordingly, amounts
available for reinvestment by the Fund are likely to be greater during a period
of declining interest rates and, as a result, likely to be reinvested at lower
interest rates than during a period of rising interest rates. Mortgage-Backed
Securities generally decrease in value as a result of increases in interest
rates and may benefit less than other fixed-income securities from declining
interest rates because of the risk of prepayment.
 
                                       8
<PAGE>
    Asset-Backed Securities involve certain risks that are not posed by
Mortgage-Backed Securities, resulting mainly from the fact that Asset-Backed
Securities do not usually contain the complete benefit of a security interest in
the related collateral. For example, credit card receivables generally are
unsecured and the debtors are entitled to the protection of a number of state
and federal consumer credit laws, some of which may reduce the ability to obtain
full payment. In the case  of automobile receivables, due to various legal and
economic factors, proceeds from repossessed collateral may not always be
sufficient to support payments on these securities.
 
    There are certain risks associated specifically with CMOs, in which the Fund
may invest up to 5% of its net assets. CMOs issued by private entities are not
U.S. Government securities and are not guaranteed by any government agency,
although the securities underlying a CMO may be subject to a guarantee.
Therefore, if the collateral securing the CMO, as well as any third party credit
support or guarantees, is insufficient to make payment, the holder could sustain
a loss. Also, a number of different factors, including the extent of prepayment
of principal of the collateralized mortgage obligations, affect the availability
of cash for principal payments by the CMO issuer on any payment date and,
accordingly, affect the timing of principal payments on each CMO class. In
addition, CMO classes with higher yields tend to be more volatile with respect
to cash flow of the underlying mortgages; as a result, the market prices of
those classes tend to be more volatile.
 
    The risks of other investment techniques which may be utilized by the Fund
are described under "Other Investment Policies" below.
 
OTHER INVESTMENT POLICIES
 
As stated above, the Fund may invest in money market instruments, which are
short-term (maturities of up to thirteen months) fixed-income securities issued
by private and governmental institutions. Money market instruments in which the
Fund may invest are securities issued or guaranteed by the U.S. Government or
its agencies (Treasury bills, notes and bonds); obligations of banks subject to
regulation by the U.S. Government and having total assets of $1 billion or more;
Eurodollar certificates of deposit; obligations of savings banks and savings and
loan associations having total assets of $1 billion or more; fully insured
certificates of deposit; and commercial paper rated within the two highest
grades by Moody's or S&P or, if not rated, issued by a company having an
outstanding debt issue rated AAA by S&P or Aaa by Moody's.
 
    REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which
may be viewed as a type of secured lending by the Fund, and which typically
involve the acquisition by the Fund of debt securities from a selling financial
institution such as a bank, savings and loan association or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the future, usually not more than seven days from the date of
purchase. While repurchase agreements involve certain risks not associated with
direct investments in debt securities, including the risks of default or
bankruptcy of the selling financial institution, the Fund follows procedures
designed to minimize such risks. These procedures include effecting repurchase
transactions only with large, well-capitalized and well-established financial
institutions and maintaining adequate collateralization.
 
    REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS.  The Fund may also use
reverse repurchase agreements and dollar rolls with respect to up to 5% of its
total assets as part of its investment strategy. Reverse repurchase agreements
involve sales by the Fund of portfolio assets concurrently with an agreement by
the Fund to repurchase the same assets at a later date at a fixed price. The
Fund also may enter into dollar rolls in which the Fund sells securities for
delivery in the current month and simultaneously contracts to repurchase
substantially similar (same type and coupon) securities on a specified future
date.
 
    Reverse repurchase agreements and dollar rolls involve the risk that the
market value of the securities the Fund is obligated to repurchase under the
agreement may decline below the repurchase price. In the event the buyer of
securities under a reverse repurchase agreement or dollar roll files for
bankruptcy or becomes insolvent, the Fund's use of the proceeds of the agreement
may be restricted pending a determination by the other party, or its trustee or
receiver, whether to enforce the Fund's obligation to repurchase the securities.
Reverse repurchase agreements and dollar rolls are speculative techniques
involving leverage, and are considered borrowings by the Fund.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From
time to time, in the ordinary course of business, the Fund may purchase
securities on a when-issued or delayed delivery basis or may purchase or sell
securities on a forward commitment basis. When such transactions are negotiated,
the price is fixed at the time of the commitment, but delivery and payment can
take place a month or more after the date of the commitment. There is no overall
limit on the percentage of the Fund's assets which may be committed to the
purchase of securities on a when-issued, delayed delivery or forward commitment
basis. An increase in the percentage of the Fund's assets committed to the
purchase of securities on a when-issued, delayed delivery or forward commitment
basis may increase the volatility of the Fund's net asset value.
 
    WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a
"when, as and if issued" basis under which the issuance of the security depends
upon the occurrence of a subsequent event, such as approval of a merger,
corporate reorganization, leveraged buyout or debt restructuring. If the
anticipated event does not occur and the securities are not issued, the Fund
will have lost an investment opportunity. There is no overall limit on the
percentage of the
 
                                       9
<PAGE>
Fund's assets which may be committed to the purchase of securities on a "when,
as and if issued" basis. An increase in the percentage of the Fund's assets
committed to the purchase of securities on a "when, as and if issued" basis may
increase the volatility of its net asset value. The Fund may also sell
securities on a "when, as and if issued" basis provided that the issuance of the
security will result automatically from the exchange or conversion of a security
owned by the Fund at the time of the sale.
 
    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.
 
    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 Adviser, pursuant to
procedures adopted by the Trustees of the Fund, will make a determination as to
the liquidity of each restricted security purchased by the Fund. If a restricted
security is determined to be "liquid," such security will not be included within
the category "illiquid securities," which under current policy may not exceed
15% of the Fund's net assets. 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 such securities.
 
    FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS.  The Fund may enter into
forward foreign currency exchange contracts ("forward contracts") in connection
with its foreign securities investments.
 
    A forward contract involves an obligation to purchase or sell a currency at
a future date, which may be any fixed number of days from the date of the
contract agreed upon by the parties, at a price set at the time of the contract.
The Fund may enter into forward contracts as a hedge against fluctuations in
future foreign exchange rates.
 
    The Fund will enter into forward contracts under various circumstances. When
the Fund enters into a contract for the purchase or sale of a security
denominated in a foreign currency, it may, for example, desire to "lock in" the
price of the security in U.S. dollars or some other foreign currency which the
Fund is temporarily holding in its portfolio.
 
    At other times, when, for example, the Adviser believes that the currency of
a particular foreign country may suffer a substantial decline against the U.S.
dollar or some other foreign currency, the Fund may enter into a forward
contract to sell, for a fixed amount of dollars or other currency, the amount of
foreign currency approximating the value of some or all of the Fund's securities
holdings (or securities which the Fund has purchased for its portfolio)
denominated in such foreign currency. Under identical circumstances, the Fund
may enter into a forward contract to sell, for a fixed amount of U.S. dollars or
other currency, an amount of foreign currency other than the currency in which
the securities to be hedged are denominated approximating the value of some or
all of the portfolio securities to be hedged. This method of hedging, called
"cross-hedging," will be selected by the Adviser when it is determined that the
foreign currency in which the portfolio securities are denominated has
insufficient liquidity or is trading at a discount as compared with some other
foreign currency with which it tends to move in tandem.
 
    If the Fund enters into forward contract transactions and the currency in
which the Fund securities holdings (or anticipated portfolio securities) are
denominated rises in value with respect to the currency which is being purchased
(or sold), then the Fund will have realized fewer gains than had the Fund not
entered into the forward contracts. Moreover, the precise matching of the
forward contract amounts and the value of the securities involved will not
generally be possible, since the future value of such securities in foreign
currencies will change as a consequence of market movements in the value of
those securities between the date the forward contract is entered into and the
date it matures. The Fund is not required to enter into such transactions with
regard to its
 
                                       10
<PAGE>
foreign currency-denominated securities and will not do so unless deemed
appropriate by the Adviser.
 
    FUTURES AND OPTIONS TRANSACTIONS.  The Fund is authorized to engage in
futures and options transactions, although it has no current intention to do so
during the coming year.
 
PORTFOLIO MANAGEMENT
 
The Fund's portfolio is actively managed by its Adviser with a view to achieving
the Fund's investment objective. James A. Tilton, Managing Director of the
Adviser, is the primary portfolio manager of the equity portion of the Fund's
portfolio, and James M. Goldberg, Managing Director of the Adviser, is the
primary portfolio manager of the fixed-income portion of the Fund's portfolio.
Messrs. Tilton and Goldberg, who have been the primary portfolio managers of the
Fund since its inception, have been portfolio managers with affiliates of The
TCW Group, Inc. since 1980 and 1984, respectively.
 
    In determining which securities to purchase for the Fund or hold in the
Fund's portfolio, the Adviser 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 the Investment Manager, and others regarding economic developments
and interest rate trends, and the Adviser's own analysis of factors it deems
relevant.
 
    Orders for transactions in portfolio securities are placed for the Fund with
a number of brokers and dealers, including DWR and other brokers and dealers
that are affiliates of the Investment Manager. The Fund may incur brokerage
commissions on transactions conducted through such affiliates. Under normal
circumstances it is not anticipated that the portfolio trading will result in
the Fund's portfolio turnover rate exceeding 150% in any one year. The Fund will
incur brokerage costs commensurate with its portfolio turnover rate, and thus a
higher level (over 100%) of portfolio transactions will increase the Fund's
overall brokerage expenses. Short term gains and losses may result from such
portfolio transactions.
 
    Except as specifically noted, all investment policies and practices
discussed above are not fundamental policies of the Fund and, as such, may be
changed without shareholder approval.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below are among the restrictions 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.  As to 75% of its total assets, 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.  As to 75% of its total assets, purchase more than 10% of the voting
    securities of any issuer.
 
        3.  Invest 25% or more of the value of its total assets in securities of
    issuers in any one industry. This restriction does not apply to obligations
    issued or guaranteed by the United States Government, 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 does not apply to
    obligations issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
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 Manager, shares of
the Fund are distributed by the Distributor and offered by DWR and others (which
may include TCW Brokerage Services, an affiliate of the Adviser) which have
entered into selected dealer agreements with the Distributor ("Selected Broker-
Dealers"). The principal executive office of the Distributor is located at Two
World Trade Center, New York, New York 10048.
 
    The Fund offers four classes of shares (each, a "Class"). Class A shares are
sold to investors with an initial sales charge
 
                                       11
<PAGE>
that declines to zero for larger purchases; however, Class A shares sold without
an initial sales charge are subject to a contingent deferred sales charge
("CDSC") of 1.0% if redeemed within one year of purchase, except for certain
specific circumstances. Class B shares are sold without an initial sales charge
but are subject to a CDSC (scaled down from 5.0% to 1.0%) payable upon most
redemptions within six years after purchase. (Class B shares purchased by
certain qualified employer-sponsored benefit plans are subject to a CDSC scaled
down from 2.0% to 1.0% if redeemed within three years after purchase.) Class C
shares are sold without an initial sales charge but are subject to a CDSC of
1.0% on most redemptions made within one year after purchase. Class D shares are
sold without an initial sales charge or CDSC and are available only to investors
meeting an initial investment minimum of $5 million, and to certain other
limited categories of investors. At the discretion of the Board of Trustees of
the Fund, Class A shares may be sold to categories of investors in addition to
those set forth in this prospectus at net asset value without a front-end sales
charge, and Class D shares may be sold to certain other categories of investors,
in each case as may be described in the then current prospectus of the Fund. See
"Alternative Purchase Arrangements -- Selecting a Particular Class" for a
discussion of factors to consider in selecting which Class of shares to
purchase.
 
    The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are only available to persons investing $5 million or more and to
certain other limited categories of investors. For the purpose of meeting the
minimum $5 million initial investment for Class D shares, and subject to the
$1,000 minimum initial investment for each Class of the Fund, an investor's
existing holdings of Class A shares and concurrent investments in Class D shares
of the Fund and other TCW/DW Funds which are multiple class funds ("TCW/DW
Multi-Class Funds") will be aggregated. Subsequent purchases of $100 or more may
be made by sending a check, payable to TCW/DW Balanced Fund, 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 at least $1,000 within the first twelve months.
In the case of investments pursuant to Systematic Payroll Deduction Plans
(including Individual Retirement Plans), the Fund, in its discretion, may accept
investments without regard to any minimum amounts which would otherwise be
required if the Fund has reason to believe that additional investments will
increase the investment in all accounts under such Plans to at least $1,000.
Certificates for shares purchased will not be issued unless a request is made by
the shareholder in writing to the Transfer Agent.
 
    Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is, payment is due on the third business day
(settlement date) after the order is placed with the Distributor. Since DWR and
other Selected Broker-Dealers forward investors' funds on settlement date, they
will benefit from the temporary use of the funds if payment is made prior
thereto. As noted above, orders placed directly with the Transfer Agent must be
accompanied by payment. Investors will be entitled to receive income dividends
and capital gains distributions if their order is received by the close of
business on the day prior to the record date for such dividends and
distributions.
 
    Sales personnel of a Selected Broker-Dealer are compensated for selling
shares of the Fund by the Distributor or any of its affiliates and/or the
Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer will receive various types of non-cash compensation as special
sales incentives, including trips, educational and/or business seminars and
merchandise. The Fund and the Distributor reserve the right to reject any
purchase order.
 
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 "Repurchases and Redemptions."
 
    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
 
                                       12
<PAGE>
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 average daily net assets of Class B. The Class B
shares' distribution fee will cause that Class to have higher expenses and pay
lower dividends than Class A or Class D shares.
 
    After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative -- Class B Shares."
 
    CLASS C SHARES.  Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on redemptions made within one
year after purchase. This CDSC may be waived for certain redemptions. They are
subject to an annual 12b-1 fee of up to 1.0% of the average daily net assets of
the Class C shares. The Class C shares' distribution fee may cause that Class to
have higher expenses and pay lower dividends than Class A or Class D shares. See
"Level Load Alternative -- Class C Shares."
 
    CLASS D SHARES.  Class D shares are available only to limited categories of
investors (see "No Load Alternative -- Class D Shares" below). Class D shares
are sold at net asset value with no initial sales charge or CDSC. They are not
subject to any 12b-1 fees. See "No Load Alternative -- Class D Shares."
    SELECTING A PARTICULAR CLASS.  In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:
 
    The decision as to which Class of shares is more beneficial to an investor
depends on the amount and intended length of his or her investment. Investors
who prefer an initial sales charge alternative may elect to purchase Class A
shares. Investors qualifying for significantly reduced or, in the case of
purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire purchase price is
immediately invested in the Fund. Any investment return on these additional
investment amounts may partially or wholly offset the higher annual expenses of
these Classes. Because 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 TCW/DW Multi-Class Funds, and
holdings of shares of "Exchange Funds" (see "Shareholder Services -- Exchange
Privilege") for which Class A shares have been exchanged, will be included
together with the current investment amount.
 
    Sales personnel may receive different compensation for selling each Class of
shares. Investors should understand that the purpose of a CDSC is the same as
that of the initial sales charge in that the sales charges applicable to each
Class provide for the financing of the distribution of shares of that Class.
 
    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 sales    0.25%          No
           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 year    1.0%           No
    D                 None                None           No
</TABLE>
 
                                       13
<PAGE>
    See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services -- Exchange Privilege" for
other differences between the Classes of shares.
 
INITIAL SALES CHARGE ALTERNATIVE -- CLASS A SHARES
 
Class A shares are sold at net asset value plus an initial sales charge. In some
cases, reduced sales charges may be available, as described below. Investments
of $1 million or more (and investments by certain other limited categories of
investors) are not subject to any sales charges at the time of purchase but are
subject to a CDSC of 1.0% on redemptions made within one year after purchase
(calculated from the last day of the month in which the shares were purchased),
except for certain specific circumstances. The CDSC will be assessed on an
amount equal to the lesser of the current market value or the cost of the shares
being redeemed. The CDSC will not be imposed (i) in the circumstances set forth
below in the section "Contingent Deferred Sales Charge Alternative -- Class B
Shares -- CDSC Waivers," except that the references to six years in the first
paragraph of that section shall mean one year in the case of Class A shares, and
(ii) in the circumstances identified in the section "Additional Net Asset Value
Purchase Options" below. Class A shares are also subject to an annual 12b-1 fee
of up to 0.25% of the average daily net assets of the Class.
 
    The offering price of Class A shares will be the net asset value per share
next determined following receipt of an order (see "Determination of Net Asset
Value" below), plus a sales charge (expressed as a percentage of the offering
price) on a single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                     SALES CHARGE
                          -----------------------------------
                           PERCENTAGE OF       APPROXIMATE
       AMOUNT OF          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 TCW/DW Multi-Class Funds. The sales charge payable on the
purchase of the Class A shares of the Fund and the Class A shares of the other
TCW/DW Multi-Class 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 TCW/DW Multi-Class Funds previously
purchased at a price including a front-end sales charge (including shares of the
Fund, other TCW/ DW Multi-Class Funds or "Exchange Funds" (see "Shareholder
Services -- Exchange Privilege") 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 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
 
                                       14
<PAGE>
Broker-Dealer or the Transfer Agent fails to confirm the investor's represented
holdings.
 
    LETTER OF INTENT.  The foregoing schedule of reduced sales charges will also
be available to investors who enter into a written Letter of Intent providing
for the purchase, within a thirteen-month period, of Class A shares of the Fund
from DWR or other Selected Broker-Dealers. The cost of Class A shares of the
Fund or Class A shares of other TCW/DW Multi-Class Funds which were previously
purchased at a price including a front-end sales charge during the 90-day period
prior to the date of receipt by the Distributor of the Letter of Intent, or of
Class A shares of the Fund or other TCW/DW Multi-Class Funds or shares of
"Exchange Funds" (see "Shareholder Services -- Exchange Privilege") acquired in
exchange for Class A 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 average daily net assets of Class B.
 
    Except as noted below, Class B shares of the Fund which are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased) will not be subject to any CDSC upon redemption.
Shares redeemed earlier than six years after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed. The size of this percentage will depend
upon how long the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
             YEAR SINCE
              PURCHASE                 CDSC AS A PERCENTAGE
            PAYMENT MADE                OF AMOUNT REDEEMED
- -------------------------------------  ---------------------
<S>                                    <C>
First................................             5.0%
Second...............................             4.0%
Third................................             3.0%
Fourth...............................             2.0%
Fifth................................             2.0%
Sixth................................             1.0%
Seventh and thereafter...............             None
</TABLE>
 
    In the case of Class B shares of the Fund held by 401(k) plans or other
employer-sponsored plans qualified under Section 401(a) of the Internal Revenue
Code for which DWTC or DWTFSB serves as Trustee or the 401(k) Support
 
                                       15
<PAGE>
Services Group of DWR serves as recordkeeper and whose accounts are opened on or
after July 28, 1997, shares held for three years or more after purchase
(calculated as described in the paragraph above) will not be subject to any CDSC
upon redemption. However, shares redeemed earlier than three years after
purchase may be subject to a CDSC (calculated as described in the paragraph
above), the percentage of which will depend on how long the shares have been
held, as set forth in the following table:
 
<TABLE>
<CAPTION>
             YEAR SINCE
              PURCHASE                 CDSC AS A PERCENTAGE
            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. Moreover, in determining whether a CDSC is
applicable it will be assumed that amounts described in (i), (ii) and (iii)
above (in that order) are redeemed first.
 
    In addition, the CDSC, if otherwise applicable, will be waived in the case
of:
 
        (1) redemptions of shares held at the time a shareholder dies or becomes
    disabled, only if the shares are: (a) registered either in the name of an
    individual shareholder (not a trust), or in the names of such shareholder
    and his or her spouse as joint tenants with right of survivorship; or  (b)
    held in a qualified corporate or self-employed retirement plan, Individual
    Retirement Account ("IRA") or Custodial Account under Section 403(b)(7) of
    the Internal Revenue Code ("403(b) Custodial Account"), provided in either
    case that the redemption is requested within one year of the death or
    initial determination of disability;
 
        (2) redemptions in connection with the following retirement plan
    distributions:  (a) lump-sum or other distributions from a qualified
    corporate or self-employed retirement plan following retirement (or, in the
    case of a "key employee" of a "top heavy" plan, following attainment of age
    59 1/2);  (b) distributions from an IRA or 403(b) Custodial Account
    following attainment of age 59 1/2; or  (c) a tax-free return of an excess
    contribution to an IRA; and
 
        (3) all redemptions of shares held for the benefit of a participant in a
    401(k) plan or other employer-sponsored plan qualified under Section 401(a)
    of the Internal Revenue Code which offers investment companies managed by
    the Manager or its parent, Dean Witter InterCapital 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.  Shares of the Fund held prior to July 28,
1997 which were acquired in exchange for shares of TCW/DW Funds sold with a
CDSC, including shares acquired through reinvestment of dividends and
distributions thereon, have been designated Class B shares. Shares held before
May 1, 1997 will convert to Class A shares in May, 2007. In all other instances
Class B shares will convert automatically to Class A shares, based on the
relative net asset values of the shares of the two Classes on the conversion
date, which will be approximately ten (10) years after the date of the original
purchase. The ten year period is calculated from the last day of the month in
which the shares were purchased or, in the case of Class B shares acquired
through an exchange or a series of exchanges, from the last day of the month in
which the original Class B shares were purchased, provided that shares
originally purchased before May 1, 1997 will convert to Class A shares in May,
2007. The conversion of shares purchased on or after May 1, 1997 will take place
in the month following the tenth anniversary of the purchase. There will also be
converted at that time such proportion of Class B shares acquired through
automatic reinvestment of dividends and distributions owned by the shareholder
as the total number of his or her Class B shares converting at the time bears to
the total number of outstanding Class B shares purchased and owned by the
shareholder. In the case of Class B shares held by a 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 TCW/DW 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
 
                                       16
<PAGE>
shares were acquired) is excluded from the holding period for conversion. If
those shares are subsequently re-exchanged for Class B shares of a TCW/DW
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 Trustees and regulatory limitations. All shares
of the Fund held prior to July 28, 1997 (other than shares which were acquired
in exchange for shares of TCW/DW Funds sold with a CDSC and shares acquired
through reinvestment of dividends and distributions thereon) have been
designated Class C shares. Shares held before July 28, 1997 that have been
designated Class C shares are not subject to the 1.0% CDSC.
 
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) certain Unit Investment
Trusts sponsored by DWR; (iv) certain other open-end investment companies whose
shares are distributed by the Distributor; and (v) other categories of
investors, at the discretion of the Board, as disclosed in the then current
prospectus of the Fund. Investors who require a $5 million minimum initial
investment to qualify to purchase Class D shares may satisfy that requirement by
investing that amount in a single transaction in Class D shares of the Fund and
other TCW/DW 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 TCW/DW
Multi-Class Funds, and holdings of shares of "Exchange Funds" (see "Shareholder
Services -- Exchange Privilege") for which Class A shares have been exchanged,
will be included together with the current investment amount. If a shareholder
redeems Class A shares and purchases Class D shares, such redemption may be a
taxable event.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
with respect to the distribution of Class A, Class B and Class C shares of the
Fund. In the case of Class A and Class C shares, the Plan provides that the Fund
will reimburse the Distributor and others for the expenses of certain activities
and services incurred by them specifically on behalf of those shares.
Reimbursements for these expenses will be made in monthly payments by the Fund
to the Distributor, which will in no event exceed amounts equal to payments at
the annual rates of 0.25% and 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 average daily net assets of Class B.
The fee is treated by the Fund as an expense in the year it is accrued. In the
case of Class A shares, the entire amount of the fee currently represents a
service fee within the meaning of the NASD guidelines. In the case of Class B
and Class C shares, a portion of the fee payable pursuant to the Plan, equal to
0.25% of the average daily net
 
                                       17
<PAGE>
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 September 30, 1996, Class C shares of the Fund
accrued payments under the Plan amounting to $971,665, which amount is equal to
0.99% of the Fund's average daily net assets for the fiscal year.
 
    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. Because there is no requirement under the Plan
that the Distributor be reimbursed for all distribution expenses or any
requirement that the Plan be continued from year to year, such excess amount
does not constitute a liability of the Fund. Although there is no legal
obligation for the Fund to pay expenses incurred in excess of payments made to
the Distributor under the Plan, and the proceeds of CDSCs paid by investors upon
redemption of shares, if for any reason the Plan is terminated the Trustees will
consider at that time the manner in which to treat such expenses. Any cumulative
expenses incurred, but not yet recovered through distribution fees or CDSCs, may
or may not be recovered through future distribution fees or CDSCs.
 
    In the case of Class A and Class C shares, expenses incurred pursuant to the
Plan in any calendar year in excess of 0.25% or 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 the net assets of the Fund, dividing by the number of shares outstanding
and adjusting to the nearest cent. The assets belonging to the Class A, Class B,
Class C and Class D shares will be invested together in a single portfolio. The
net asset value of each Class, however, will be determined separately by
subtracting each Class's accrued expenses and liabilities. The net asset value
per share will not be determined on Good Friday and on such other federal and
non-federal holidays as are observed by the New York Stock Exchange.
 
    In the calculation of the Fund's net asset value: (1) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
stock exchange is valued at its latest sale price on that exchange prior to the
time when assets are valued; if there were no sales that day, the security, is
valued at the latest bid price (in cases where securities are traded on more
than one exchange, the securities are valued on the exchange designated as the
primary market pursuant to procedures adopted by the Trustees); and (2) all
other portfolio securities for which over-the-counter market quotations are
readily available are valued at the latest available bid price prior to the time
of valuation. When market quotations are not readily available, including
circumstances under which it is determined by the Adviser that sale or bid
prices are not reflective of a security's market value, portfolio securities are
valued at their fair value as determined in good faith under procedures
established by and under the general supervision of the Fund's Trustees. For
valuation purposes, quotations of foreign portfolio securities are translated
into U.S. dollar equivalents at the prevailing market rates prior to the close
of the New York Stock Exchange as of the morning of valuation. Dividends
receivable are accrued as of the ex-dividend date or as of the time that the
relevant ex-dividend date and amounts become known.
 
    Short-term debt securities with remaining maturities of 60 days or less at
the time of purchase are valued at amortized cost, unless the Trustees determine
such does not reflect the securities' market value, in which case these
securities will be valued at their fair value as determined by the Trustees.
 
    Certain of the Fund's portfolio securities may be valued by an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix system incorporating security quality, maturity and coupon as the
evaluation model parameters, and/or research and 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.
 
                                       18
<PAGE>
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 TCW/DW 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
"Repurchases and Redemptions").
 
    INVESTMENT OF DIVIDENDS OR 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 30 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 "Repurchases and Redemptions").
 
    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 "Repurchases and Redemptions --
Involuntary Redemption").
 
    SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset value.
The Withdrawal Plan provides for monthly or quarterly (March, June, September
and December) checks in any dollar amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Any applicable CDSC
will be imposed on shares redeemed under the Withdrawal Plan (see "Purchase of
Fund Shares"). Therefore, any shareholder participating in the Withdrawal Plan
will have sufficient shares redeemed from his or her account so that the
proceeds (net of any applicable CDSC) to the shareholder will be the designated
monthly or quarterly amount. Withdrawal plan payments should not be considered
as dividends, yields or income. If periodic withdrawal plan payments
continuously exceed net investment income and net capital gains, the
shareholder's original investment will be correspondingly reduced and ultimately
exhausted. Each withdrawal constitutes a redemption of shares and any gain or
loss realized must be recognized for federal income tax purposes.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
    TAX SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their DWR or other Selected
Broker-Dealer account executive or the Fund.
 
EXCHANGE PRIVILEGE
 
Shares of each Class may be exchanged for shares of the same Class of any other
TCW/DW Multi-Class Fund without the imposition of any exchange fee. Shares may
also be exchanged for shares of TCW/DW North American Government Income Trust
and for shares of five money market funds for which InterCapital serves as
investment manager: Dean Witter Liquid Asset Fund Inc., Dean Witter U.S.
Government Money Market Trust, Dean Witter Tax-Free Daily Income Trust, Dean
Witter California Tax-Free Daily Income Trust and Dean Witter New York Municipal
Money Market Trust (the foregoing six funds are hereinafter collectively
referred to as "Exchange Funds"). Exchanges may be made after the shares of the
Fund acquired by purchase (not by exchange or dividend reinvestment) have been
held for thirty days. There is no waiting period for exchanges of shares
acquired by exchange or dividend reinvestment.
 
    An exchange to another TCW/DW Multi-Class 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 TCW/DW Multi-Class 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 TCW/DW Multi-Class Fund,
the holding period previously frozen when the first exchange was made resumes on
the last day of the month in which shares of a TCW/DW Multi-Class Fund are
reacquired. Thus, the CDSC is based upon the time (calculated as described
above) the shareholder was invested in shares of a TCW/DW Multi-Class Fund (see
"Purchase of Fund
 
                                       19
<PAGE>
Shares"). However, in the case of shares exchanged into an Exchange Fund, 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 which are attributable to those shares. (Exchange
Fund 12b-1 distribution fees are described in the prospectuses for those funds.)
 
    ADDITIONAL INFORMATION REGARDING EXCHANGES.  Purchases and exchanges should
be made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Manager to be abusive and contrary to the best interests of the
Fund's other shareholders and, at the 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, each of the other TCW/DW Funds and each of the money market
funds may in their discretion limit or otherwise restrict the number of times
this Exchange Privilege may be exercised by any investor. Any such restriction
will be made by the Fund on a prospective basis only, upon notice to the
shareholder not later than ten days following such shareholder's most recent
exchange. Also, the Exchange Privilege may be terminated or revised at any time
by the Fund and/or any of such TCW/DW Funds or money market funds for which
shares of the Fund have been exchanged, upon such notice as may be required by
applicable regulatory agencies. Shareholders maintaining margin accounts with
DWR or another Selected Broker-Dealer are referred to their account executive
regarding restrictions on exchange of shares pledged in the margin account.
 
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain a copy and examine it carefully
before investing. Exchanges are subject to the minimum investment requirement of
each Class of shares and any other conditions imposed by each fund. In the case
of a shareholder holding a share certificate or certificates, no exchanges may
be made until all applicable share certificates have been received by the
Transfer Agent and deposited in the shareholder's account. An exchange will be
treated for federal income tax purposes the same as a repurchase or redemption
of shares, on which the shareholder may realize a capital gain or loss. However,
the ability to deduct capital losses on an exchange may be limited in situations
where there is an exchange of shares within ninety days after the shares are
purchased. The Exchange Privilege is only available in states where an exchange
may legally be made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the funds for
which the Exchange Privilege is available pursuant to this Exchange Privilege by
contacting their DWR or other Selected Broker-Dealer account executive (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or another Selected Broker-Dealer but
who wish to make exchanges directly by writing or telephoning the Transfer
Agent) must complete and forward to the Transfer Agent an Exchange Privilege
Authorization Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization Form is used, exchanges may be made
in writing or by contacting the Transfer Agent at (800) 869-NEWS (toll free).
The Fund will employ reasonable procedures to confirm that exchange instructions
communicated over the telephone are genuine. The 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 DWR or other Selected
Broker-Dealer account executive, if appropriate, or make a written exchange
request. Shareholders are advised that during periods of drastic economic or
market changes, it is possible that the telephone exchange procedures may be
difficult to implement, although this has not been the case in the past with
other funds managed by the Manager.
 
    For further information regarding the Exchange Privilege, shareholders
should contact their DWR or other Selected Broker-Dealer account executive or
the Transfer Agent.
 
REPURCHASES AND REDEMPTIONS
- --------------------------------------------------------------------------------
 
    REPURCHASES.  DWR and other Selected Broker-Dealers are authorized to
repurchase shares represented by a share certificate which is delivered to any
of their offices. Shares held in a shareholder's account without a share
certificate may also be repurchased by DWR and other Selected Broker-Dealers
upon the telephonic request of the shareholder. The repurchase price is the net
asset value next determined (see "Purchase of Fund Shares") after such
repurchase order
 
                                       20
<PAGE>
is received by DWR or the other Selected Broker-Dealer reduced by any applicable
CDSC.
 
    The CDSC, if any, will be the only fee imposed by the Fund or the
Distributor. The offer by DWR and other Selected Broker-Dealers to repurchase
shares may be suspended without notice by them at any time. In that event,
shareholders may redeem their shares through the Fund's Transfer Agent as set
forth below under "Redemptions."
 
    REDEMPTIONS.  Shares of each Class of the Fund can be redeemed for cash at
any time at net asset value per share next determined less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see "Purchase
of Fund Shares"). If shares are held in a shareholder's account without a share
certificate, a written request for redemption to the Fund's Transfer Agent at
P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by the
shareholder, the shares may be redeemed by surrendering the certificates with a
written request for redemption, along with any additional information required
by the Transfer Agent.
 
    PAYMENT FOR SHARES REPURCHASED OR REDEEMED.  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. 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
repurchased or redeemed and has not previously exercised this reinstatement
privilege may, within 35 days after the date of the repurchase or redemption,
reinstate any portion or all of the proceeds of such repurchase or redemption in
shares of the Fund in the same Class from which such shares were redeemed or
repurchased, at net asset value next determined after a reinstatement request,
together with the proceeds, is received by the Transfer Agent and receive a pro
rata credit for any CDSC paid in connection with such redemption or repurchase.
 
    INVOLUNTARY REDEMPTION.  The Fund reserves the right, on 60 days' notice, to
redeem, at their net asset value, the shares of any shareholder (other than
shares held in an Individual Retirement Account or Custodial Account under
Section 403(b)(7) of the Internal Revenue Code) whose shares due to redemptions
by the shareholder have a value of less than $100 or such lesser amount as may
be fixed by the Trustees or, in the case of an account opened through
EasyInvest-SM-, if after twelve months the shareholder has invested less than
$1,000 in the account. However, before the Fund redeems such shares and sends
the proceeds to the shareholder, it will notify the shareholder that the value
of the shares is less than the applicable amount and allow him or her 60 days to
make an additional investment in an amount which will increase the value of his
or her account to at least the applicable amount or more before the redemption
is processed. No CDSC will be imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Fund declares dividends separately for
each Class of shares and intends to pay quarterly income dividends and to
distribute net short-term and net long-term capital gains, if any, at least once
each year. The Fund may, however, determine either to distribute or to retain
all or part of any net long-term capital gains in any year for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
shares of the same Class and automatically credited to the shareholder's account
without issuance of a share certificate unless the shareholder requests in
writing that all dividends and/or distributions be paid in cash. Shares acquired
by dividend and distribution reinvestments will not be subject to any front-end
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 capital gains to shareholders and otherwise continue to qualify as a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is not expected that the Fund will be required to pay any federal income tax.
Shareholders who are required to pay taxes on their income will normally have to
pay federal income taxes, and any state income taxes, on the dividends and
distributions they receive from the Fund. Such dividends and distributions to
the extent that they are derived from net investment income or short-term
capital gains, are taxable to the shareholder as ordinary income regardless of
whether the shareholder receives such payments in additional shares or in cash.
Any dividends declared in the last quarter of any calendar year which are paid
in the following year prior to
 
                                       21
<PAGE>
February 1 will be deemed to have been received by the shareholder in the prior
year. Dividend payments will be eligible for the federal dividends received
deduction available to the Fund's corporate shareholders only to the extent the
aggregate dividends received by the Fund would be eligible for the deduction if
the Fund were the shareholder claiming the dividends received deduction. 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 would, in effect, represent a return
of a portion of each shareholder's investment. All, or a portion, of such
payments would not be taxable to shareholders.
 
    After the end of the year, shareholders will be sent full information on
their dividends and capital gains distributions for tax purposes. To avoid being
subject to a 31% federal backup withholding tax on taxable dividends, capital
gains distributions and the proceeds of redemptions and repurchases,
shareholders' taxpayer identification numbers must be furnished and certified as
to 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 "yield" and/or its "total return" in
advertisements and sales literature. These figures are computed separately for
Class A, Class B, Class C and Class D shares. Both the yield and the total
return of the Fund are based on historical earnings and are not intended to
indicate future performance. The yield of each Class of the Fund is computed by
dividing the Class's net investment income over a 30-day period by an average
value (using the average number of shares entitled to receive dividends and the
net asset value per share at the end of the period), all in accordance with
applicable regulatory requirements. Such amount is compounded for six months and
then annualized for a twelve-month period to derive the yield of the Fund for
each Class.
 
    The "average annual total return" of the Fund refers to a figure reflecting
the average annualized percentage increase (or decrease) in the value of an
initial investment in a Class of the Fund of $1,000 over a period of one, five
and ten years or over the life of the Fund, if less than any of the foregoing.
Average annual total return reflects all income earned by the Fund, any
appreciation or depreciation of the Fund's assets, all expenses incurred by the
applicable Class and all sales charges 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, and
year-by-year or other types of total return figures. Such calculations may or
may not reflect the deduction of any sales charge which, if reflected, would
reduce the performance quoted. The Fund may also advertise the growth of
hypothetical investments of $10,000, $50,000 and $100,000 in each Class of
shares of the Fund. The Fund from time to time may also advertise its
performance relative to certain performance rankings and indexes compiled by
independent organizations (such as mutual fund performance rankings of Lipper
Analytical Services, Inc.).
 
    Prior to July 28, 1997, the Fund offered only one Class of shares. Because
all shares of the Fund held prior to such time (other than shares which were
acquired in exchange for shares of TCW/DW Funds offered with a CDSC and shares
acquired through reinvestment of dividends and distributions thereon) have been
designated Class C shares, the Fund's historical performance may be restated to
reflect the current maximum sales charge applicable to Class C.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
    VOTING RIGHTS.  All shares of beneficial interest of the Fund are of $0.01
par value and are equal as to earnings, assets and voting privileges except that
each Class will have exclusive voting privileges with respect to matters
relating to distribution expenses borne solely by such Class or any other matter
in which the interests of one Class differ from the interests of any other
Class. In addition, Class B shareholders will have the right to vote on any
proposed material increase in Class A's expenses, if such proposal is submitted
separately to Class A shareholders. Also, as discussed herein, Class A, Class B
and Class C bear the expenses related to the distribution of their respective
shares.
 
    The Fund is not required to hold Annual Meetings of Shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Trustees may call
 
                                       22
<PAGE>
Special Meetings of Shareholders for action by shareholder vote as may be
required by the Act or the Declaration of Trust. Under certain circumstances the
Trustees may be removed by action of the Trustees or by the shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
limited circumstances, be held personally liable as partners for obligations of
the Fund. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Fund, requires that Fund
obligations include such disclaimer, and provides for indemnification and
reimbursement of expenses out of the Fund's property for any shareholder held
personally liable for the obligations of the Fund. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Fund itself would be unable to meet its
obligations. Given the above limitations on shareholder personal liability, and
the nature of the Fund's assets and operations, in the opinion of Massachusetts
counsel to the Fund, the risk to shareholders of personal liability is remote.
 
    CODE OF ETHICS.  The Adviser is subject to a Code of Ethics with respect to
investment transactions in which the Adviser's officers, directors and certain
other persons have a beneficial interest to avoid any actual or potential
conflict or abuse of their fiduciary position. The Code of Ethics, as it
pertains to the TCW/DW Funds, contains several restrictions and procedures
designed to eliminate conflicts of interest including: (a) pre-clearance of
personal investment transactions to ensure that personal transactions by
employees are not being conducted at the same time as the Adviser's clients; (b)
quarterly reporting of personal securities transactions; (c) a prohibition
against personally acquiring securities in an initial public offering, entering
into uncovered short sales and writing uncovered options; (d) a seven day
"black-out period" prior or subsequent to a TCW/DW Fund transaction during which
portfolio managers are prohibited from making certain transactions in securities
which are being purchased or sold by a TCW/DW Fund; (e) a prohibition, with
respect to certain investment personnel, from profiting in the purchase and
sale, or sale and purchase, of the same (or equivalent) securities within 60
calendar days; and (f) a prohibition against acquiring any security which is
subject to firm wide or, if applicable, a department restriction of the Adviser.
The Code of Ethics provides that exemptive relief may be given from certain of
its requirements, upon application. The Adviser's Code of Ethics complies with
regulatory requirements and, insofar as it relates to persons associated with
registered investment companies, the 1994 Report of the Advisory Group on
Personal Investing of the Investment Company Institute.
 
    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.
 
                                       23
<PAGE>
TCW/DW BALANCED FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
TRUSTEES
John C. Argue
Richard M. DeMartini
Charles A. Fiumefreddo
John R. Haire
Dr. Manuel H. Johnson
Thomas E. Larkin, Jr.
Michael E. Nugent
John L. Schroeder
Marc I. Stern
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
 
Thomas E. Larkin, Jr.
President
 
Barry Fink
Vice President, Secretary and General Counsel
 
James A. Tilton
Vice President
 
James M. Goldberg
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
 
MANAGER
Dean Witter Services Company Inc.
 
ADVISER
TCW Funds Management, Inc.


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