MORGAN STANLEY WITTER DEAN AGGRESSIVE EQUITY FUND
497, 1999-10-12
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<PAGE>
                                                PROSPECTUS -  SEPTEMBER 27, 1999

MORGAN STANLEY DEAN WITTER
                                                          AGGRESSIVE EQUITY FUND

[COVER PHOTO]

                                         A MUTUAL FUND THAT SEEKS CAPITAL GROWTH

  The Securities and Exchange Commission has not approved or disapproved these
           securities or passed upon the adequacy of this PROSPECTUS.
           Any representation to the contrary is a criminal offense.
<PAGE>
CONTENTS

<TABLE>
<S>                       <C>                                                           <C>
The Fund                  Investment Objective........................................                   1
                          Principal Investment Strategies.............................                   1
                          Principal Risks.............................................                   2
                          Fees and Expenses...........................................                   4
                          Additional Investment Strategy Information..................                   5
                          Additional Risk Information.................................                   6
                          Fund Management.............................................                   7

Shareholder Information   Pricing Fund Shares.........................................                   8
                          How to Buy Shares...........................................                   8
                          How to Exchange Shares......................................                  10
                          How to Sell Shares..........................................                  11
                          Distributions...............................................                  13
                          Tax Consequences............................................                  13
                          Share Class Arrangements....................................                  14

Financial Highlights      ............................................................                  22

Our Family of Funds       ............................................................   Inside Back Cover

                          THIS PROSPECTUS CONTAINS IMPORTANT INFORMATION ABOUT THE FUND. PLEASE READ IT
                          CAREFULLY AND KEEP IT FOR FUTURE REFERENCE.
</TABLE>
<PAGE>
[Sidebar]
CAPITAL GROWTH
An investment objective having the goal of selecting securities with the
potential to rise in price and pay out income.
[End Sidebar]

THE FUND

[ICON]              INVESTMENT OBJECTIVE
- --------------------------------------------------------------------------------
                    Morgan Stanley Dean Witter Aggressive Equity Fund seeks
                    capital growth.

[ICON]              PRINCIPAL INVESTMENT STRATEGIES
- --------------------------------------------------------------------------------
                    The Fund normally invests at least 65% of its total assets
                    in common stocks and other equity securities of U.S. or
                    foreign companies that (i) are covered by Morgan Stanley
                    Dean Witter Equity Research ("MSDW Equity Research") and
                    (ii) offer the potential for superior earnings growth in the
                    opinion of the Fund's "Investment Manager," Morgan Stanley
                    Dean Witter Advisors Inc. The Fund's other equity securities
                    may include preferred stock or securities convertible into
                    common stock.

                    In deciding which securities to buy, hold, or sell, the
                    Investment Manager utilizes a process, known as sector
                    rotation, that emphasizes industry selection over individual
                    company selection. The Investment Manager invests in those
                    industries that it believes will have the strongest relative
                    earnings growth potential given the projected economic
                    outlook. After selecting the Fund's target industries, the
                    Investment Manager then selects specific companies within
                    those industries whose prospects are deemed attractive after
                    assessing company fundamentals and valuation screens.
                    Company selection is based on the Investment Manager's own
                    analysis and on its review of the research reports and
                    analysis provided by MSDW Equity Research. The Investment
                    Manager will also use research reports and analysis from the
                    equity research departments of other recognized securities
                    firms. The Investment Manager has no general criteria as to
                    the market capitalization or asset size of the companies
                    selected for investment and, accordingly, the Fund may
                    invest in small and medium-sized companies in addition to
                    larger more established companies.

                    SECTOR ROTATION. The Investment Manager will utilize a
                    sector rotation process designed to respond to changing
                    economic cycles by proactively investing in industries that
                    the Investment Manager believes to be positioned to benefit
                    from the current phase of the economic cycle. First, the
                    Investment Manager attempts to identify at what stage of the
                    business cycle the economy is in and which industries have
                    historically outperformed the overall market during that
                    stage of the cycle. To accomplish this task, the Investment
                    Manager establishes an economic forecast based on its
                    short-term and long-term views of the domestic and global
                    economic cycles. As part of this process, the Investment
                    Manager will attempt to identify secular trends, such as
                    shifting demographics or technological developments, that
                    could add clarity to its analysis. Also considered are
                    competitive industry variables, such as supply and demand,
                    pricing trends and new product cycles.

                                                                               1
<PAGE>
                    MSDW EQUITY RESEARCH. MSDW Equity Research is recognized as
                    a world leader in global financial research and provides
                    comprehensive research and in-depth knowledge about general
                    markets and specific companies from around the world. MSDW
                    Equity Research currently covers approximately 2,100
                    companies in 21 industry sectors worldwide. MSDW Equity
                    Research provides coverage of a company if, at the time of
                    investment, it has assigned a rating - currently Strong Buy,
                    Outperform, Neutral or Underperform - on that company
                    (regulatory or other reasons may restrict its ability to
                    publish research or it may temporarily suspend publishing
                    research due to transitions in the composition of its
                    industry analysts on any covered company). Coverage of a
                    company is not intended to be, and should not be viewed as,
                    a recommendation that an investor buy, sell or hold
                    securities of that company. MSDW Equity Research has no role
                    in the selection of individual securities for the Fund's
                    portfolio. It may drop coverage of any one security or
                    reduce the total number of companies covered at any time.

                    The Fund may invest up to 25% of its assets in foreign
                    securities (including depository receipts). This percentage
                    limitation, however, does not apply to securities of foreign
                    companies that are listed in the U.S. on a national
                    securities exchange.

                    In addition, the Fund may invest in equity securities that
                    are not covered by MSDW Equity Research, in fixed-income
                    securities and in options and futures.

                    Common stock is a share ownership or equity interest in a
                    corporation. It may or may not pay dividends, as some
                    companies reinvest all of their profits back into their
                    businesses, while others pay out some of their profits to
                    shareholders as dividends. A depository receipt is generally
                    issued by a bank or financial institution and represents an
                    ownership interest in the common stock or other equity
                    securities of a foreign company.

                    In pursuing the Fund's investment objective, the Investment
                    Manager has considerable leeway in deciding which
                    investments it buys, holds or sells on a day-to-day basis
                    and which trading strategies it uses. For example, the
                    Investment Manager in its discretion may determine to use
                    some permitted trading strategies while not using others.

[ICON]              PRINCIPAL RISKS
- --------------------------------------------------------------------------------
                    There is no assurance that the Fund will achieve its
                    investment objective. The Fund's share price will fluctuate
                    with changes in the market value of the Fund's portfolio
                    securities. When you sell Fund shares, they may be worth
                    less than what you paid for them and, accordingly, you can
                    lose money investing in this Fund.

                    COMMON STOCKS. A principal risk of investing in the Fund is
                    associated with its common stock investments. In general,
                    stock values fluctuate in response to activities specific to
                    the company as well as general market, economic and
                    political conditions. Stock prices can fluctuate widely in
                    response to these factors. The Fund's emphasis on industries
                    may cause its performance to be more sensitive to
                    developments affecting particular industries than a fund
                    that places primary emphasis on individual companies.

 2
<PAGE>
                    SMALL AND MEDIUM-SIZED COMPANIES. The Fund may invest in
                    small and medium-sized companies. Investing in securities of
                    these companies involves greater risk than is customarily
                    associated with investing in more established companies.
                    These companies'stocks may be more volatile and less liquid
                    than the stocks of more established companies. These stocks
                    may have returns that vary, sometimes significantly, from
                    the overall stock market.

                    FOREIGN SECURITIES. The Fund's investments in foreign
                    securities (including depository receipts) may involve risks
                    in addition to the risks associated with domestic
                    securities. One additional risk is currency risk. While the
                    price of Fund shares is quoted in U.S. dollars, the Fund
                    generally converts U.S. dollars to a foreign market's local
                    currency to purchase a security in that market. If the value
                    of that local currency falls relative to the U.S. dollar,
                    the U.S. dollar value of the foreign security will decrease.
                    This is true even if the foreign security's local price
                    remains unchanged.

                    Foreign securities also have risks related to economic and
                    political developments abroad, including expropriations,
                    confiscatory taxation, exchange control regulation,
                    limitations on the use or transfer of Fund assets and any
                    effects of foreign social, economic or political
                    instability. Foreign companies, in general, are not subject
                    to the regulatory requirements of U.S. companies and, as
                    such, there may be less publicly available information about
                    these companies. Moreover, foreign accounting, auditing and
                    financial reporting standards generally are different from
                    those applicable to U.S. companies. Finally, in the event of
                    a default of any foreign debt obligations, it may be more
                    difficult for the Fund to obtain or enforce a judgment
                    against the issuers of the securities.

                    Securities of foreign issuers may be less liquid than
                    comparable securities of U.S. issuers and, as such, their
                    price changes may be more volatile. Furthermore, foreign
                    exchanges and broker-dealers are generally subject to less
                    government and exchange scrutiny and regulation than their
                    U.S. counterparts. In addition, differences in clearance and
                    settlement procedures in foreign markets may occasion delays
                    in settlements of the Fund's trades effected in those
                    markets.

                    Many European countries have adopted or are in the process
                    of adopting a single European currency, referred to as the
                    "euro." The long-term consequences of the euro conversion
                    for foreign exchange rates, interest rates and the value of
                    European securities the Fund may purchase are unclear. The
                    consequences may adversely affect the value and/or increase
                    the volatility of securities held by the Fund.

                                                                               3
<PAGE>
[Sidebar]
SHAREHOLDER FEES
These fees are paid directly from your investment.

ANNUAL FUND
OPERATING EXPENSES
These expenses are deducted from the Fund's assets and are estimated based on
expenses paid for the fiscal period ended July 31, 1999.
[End Sidebar]

                    CONVERTIBLE SECURITIES. The Fund also may invest in
                    convertible securities, which are securities that generally
                    pay dividends or interest and may be converted into common
                    stock. These securities may carry risks associated with both
                    common stock and fixed-income securities.

                    The performance of the Fund also will depend on whether or
                    not the Investment Manager is successful in pursuing the
                    Fund's investment strategy. The Fund is also subject to
                    other risks from its permissible investments including the
                    risks associated with its investments in fixed-income
                    securities and options and futures. For more information
                    about these risks, see the "Additional Risk Information"
                    section.

                    Shares of the Fund are not bank deposits and are not
                    guaranteed or insured by the FDIC or any other government
                    agency.

[ICON]              FEES AND EXPENSES
- --------------------------------------------------------------------------------
                    The table below briefly describes the fees and expenses that
                    you may pay if you buy and hold shares of the Fund. The Fund
                    offers four Classes of shares: Classes A, B, C and D. Each
                    Class has a different combination of fees, expenses and
                    other features. The Fund does not charge account or exchange
                    fees. See the "Share Class Arrangements" section for further
                    fee and expense information.

<TABLE>
<CAPTION>
                                                               CLASS A     CLASS B     CLASS C    CLASS D
<S>                                                           <C>         <C>         <C>         <C>
- ---------------------------------------------------------------------------------------------------------
 SHAREHOLDER FEES
- ---------------------------------------------------------------------------------------------------------
 Maximum sales charge (load) imposed on purchases (as a
 percentage of offering price)                                  5.25%(1)    None        None       None
- ---------------------------------------------------------------------------------------------------------
 Maximum deferred sales charge (load)
 (as a percentage based on the lesser of
 the offering price or net asset value at redemption)          None(2)      5.00%(3)    1.00%(4)   None
- ---------------------------------------------------------------------------------------------------------
 ANNUAL FUND OPERATING EXPENSES
- ---------------------------------------------------------------------------------------------------------
 Management fee                                                 0.75%       0.75%       0.75%      0.75%
- ---------------------------------------------------------------------------------------------------------
 Distribution and service (12b-1) fees                          0.25%       1.00%       1.00%      None
- ---------------------------------------------------------------------------------------------------------
 Other expenses                                                 0.31%       0.31%       0.31%      0.31%
- ---------------------------------------------------------------------------------------------------------
 Total annual Fund operating expenses                           1.31%       2.06%       2.06%      1.06%
- ---------------------------------------------------------------------------------------------------------
</TABLE>

1    Reduced for purchases of $25,000 and over.
2    Investments that are not subject to any sales charge at the time of
     purchase are subject to a contingent deferred sales charge ("CDSC") of
     1.00% that will be imposed if you sell your shares within one year after
     purchase, except for certain specific circumstances.
3    The CDSC is scaled down to 1.00% during the sixth year, reaching zero
     thereafter. See "Share Class Arrangements" for a complete discussion of the
     CDSC.
4    Only applicable if you sell your shares within one year after purchase.

 4
<PAGE>
                    EXAMPLE
                    This example is intended to help you compare the cost of
                    investing in the Fund with the cost of investing in other
                    mutual funds.

                    The example assumes that you invest $10,000 in the Fund,
                    your investment has a 5% return each year, and the Fund's
                    operating expenses remain the same. Although your actual
                    costs may be higher or lower, the tables below show your
                    costs at the end of each period based on these assumptions
                    depending upon whether or not you sell your shares at the
                    end of each period.

<TABLE>
<CAPTION>
                  IF YOU SOLD YOUR     IF YOU HELD YOUR
                      SHARES:              SHARES:
                 ------------------   ------------------
                 1 YEAR    3 YEARS    1 YEAR    3 YEARS
<S>              <C>       <C>        <C>       <C>
- -----------------------------------   ------------------
 CLASS A           $651      $918       $651      $918
- -----------------------------------   ------------------
 CLASS B           $709      $946       $209      $646
- -----------------------------------   ------------------
 CLASS C           $309      $646       $209      $646
- -----------------------------------   ------------------
 CLASS D           $108      $337       $108      $337
- -----------------------------------   ------------------
</TABLE>

                    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.

[ICON]              ADDITIONAL INVESTMENT STRATEGY INFORMATION
- --------------------------------------------------------------------------------

                    This section provides additional information relating to the
                    Fund's principal strategies.

                    FIXED-INCOME SECURITIES. The Fund may invest up to 35% of
                    its total assets in debt securities (including zero coupon
                    bonds) issued by the U.S. government, U.S. or foreign
                    companies or foreign governments. Up to 5% of the Fund's
                    fixed-income investments may be rated below investment grade
                    (commonly known as "junk bonds").

                    OPTIONS AND FUTURES. The Fund may purchase and sell stock
                    index futures contracts and may purchase put options on
                    stock indexes and stock index futures. Stock index futures
                    and options on stock indexes and stock index futures may be
                    used to facilitate trading, to increase or decrease the
                    Fund's market exposure, to seek higher investment returns,
                    or to seek to protect against a decline in the value of the
                    Fund's securities or an increase in prices of securities
                    that may be purchased.

                    DEFENSIVE INVESTING. The Fund may take temporary "defensive"
                    positions in attempting to respond to adverse market
                    conditions. The Fund may invest any amount of its total
                    assets in cash or money market instruments in a defensive
                    posture when the Investment Manager believes it is advisable
                    to do so. Although taking a defensive posture is designed to
                    protect the Fund from an anticipated market downturn, it
                    could have the effect of reducing the benefit from any
                    upswing in the market. When the Fund takes a defensive
                    position, it may not achieve its investment objective.

                                                                               5
<PAGE>
                    PORTFOLIO TURNOVER. The Fund may engage in active and
                    frequent trading of portfolio securities to achieve its
                    principal investment strategies. The portfolio turnover rate
                    is not expected to exceed 400% annually under normal
                    circumstances. A high turnover rate, such as 400%, will
                    increase Fund brokerage costs. It also may increase the
                    Fund's capital gains, which are passed along to Fund
                    shareholders as distributions. This, in turn, may increase
                    your tax liability as a Fund shareholder. See the sections
                    on "Distributions" and "Tax Consequences."

                    The percentage limitations relating to the composition of
                    the Fund's portfolio apply at the time the Fund acquires an
                    investment and refer to the Fund's net assets, unless
                    otherwise noted. Subsequent percentage changes that result
                    from market fluctuations will not require the Fund to sell
                    any portfolio security. The Fund may change its principal
                    investment strategies without shareholder approval; however,
                    you would be notified of any changes.

[ICON]              ADDITIONAL RISK INFORMATION
- --------------------------------------------------------------------------------
                    This section provides additional information relating to the
                    principal risks of investing in the Fund.

                    FIXED-INCOME SECURITIES. Principal risks of investing in the
                    Fund are associated with its fixed-income investments. All
                    fixed-income securities, such as corporate debt, are subject
                    to two types of risk: credit risk and interest rate risk.
                    Credit risk refers to the possibility that the issuer of a
                    security will be unable to make interest payments and repay
                    the principal on its debt. A portion of the Fund's
                    fixed-income investments may have speculative
                    characteristics.

                    Interest rate risk refers to fluctuations in the value of a
                    fixed-income security resulting from changes in the general
                    level of interest rates. When the general level of interest
                    rates goes up, the prices of most fixed-income securities go
                    down. When the general level of interest rates goes down,
                    the prices of most fixed-income securities go up. (Zero
                    coupon securities are typically subject to greater price
                    fluctuations than comparable securities that pay interest.)

                    OPTIONS AND FUTURES. If the Fund invests in stock index
                    futures or options on stock indexes or stock index futures,
                    its participation in these markets would subject the Fund to
                    certain risks. If the Investment Manager's predictions of
                    movements in the direction of the stock index are
                    inaccurate, the adverse consequences to the Fund (e.g., a
                    reduction in the Fund's net asset value or a reduction in
                    the amount of income available for distribution) may leave
                    the Fund in a worse position than if these strategies were
                    not used. Other risks inherent in the use of stock index
                    futures and options on stock indexes and stock index futures
                    include, for example, the possible imperfect correlation
                    between the price of futures contracts and movements in the
                    prices of the securities, and the possible absence of a
                    liquid secondary market for any particular instrument.

 6
<PAGE>
[Sidebar]
MORGAN STANLEY DEAN WITTER ADVISORS INC.
The Investment Manager is widely recognized as a leader in the mutual fund
industry and together with Morgan Stanley Dean Witter Services Company Inc., its
wholly-owned subsidiary, has more than $136 billion in assets under management
or administration as of August 31, 1999.
[End Sidebar]

                    YEAR 2000. The Fund could be adversely affected if the
                    computer systems necessary for the efficient operation of
                    the Investment Manager, the Fund's other service providers
                    and the markets and corporate and governmental issuers in
                    which the Fund invests do not properly process and calculate
                    date-related information from and after January 1, 2000.
                    While year 2000-related computer problems could have a
                    negative effect on the Fund, the Investment Manager and its
                    affiliates are working hard to avoid any problems and to
                    obtain assurances from their service providers that they are
                    taking similar steps.

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

[ICON]              FUND MANAGEMENT
- --------------------------------------------------------------------------------
                    The Fund has retained the Investment Manager - Morgan
                    Stanley Dean Witter Advisors Inc. - to provide
                    administrative services, manage its business affairs and
                    invest its assets, including the placing of orders for the
                    purchase and sale of portfolio securities. The Investment
                    Manager is a wholly-owned subsidiary of Morgan Stanley Dean
                    Witter & Co., a preeminent global financial services firm
                    that maintains leading market positions in each of its three
                    primary businesses: securities, asset management and credit
                    services. Its main business office is located at Two World
                    Trade Center, New York, NY 10048.

                    The Fund's portfolio is managed within the Investment
                    Manager's Sector Rotation Group. Anita H. Kolleeny, Senior
                    Vice President of the Investment Manager and Director of the
                    Sector Rotation Group, has been the primary portfolio
                    manager of the Fund since its inception. Co-management is
                    provided by Michelle Kaufman, a Senior Vice President of the
                    Investment Manager and a member of the Sector Rotation
                    Group. Ms. Kolleeny and Ms. Kaufman have been with the
                    Investment Manager for over five years.

                    The Fund pays the Investment Manager a monthly management
                    fee as full compensation for the services and facilities
                    furnished to the Fund, and for Fund expenses assumed by the
                    Investment Manager. The fee is calculated at the annual rate
                    of 0.75% of the Fund's average daily net assets.

                                                                               7
<PAGE>
[Sidebar]
CONTACTING A
FINANCIAL ADVISOR
If you are new to the Morgan Stanley Dean Witter Family of Funds and would like
to contact a Financial Advisor, call (800) THE-DEAN for the telephone number of
the Morgan Stanley Dean Witter office nearest you. You may also access our
office locator on our Internet site at:
www.msdw.com/individual/funds
[End Sidebar]

SHAREHOLDER INFORMATION

[ICON]              PRICING FUND SHARES
- --------------------------------------------------------------------------------
                    The price of Fund shares (excluding sales charges), called
                    "net asset value," is based on the value of the Fund's
                    portfolio securities. While the assets of each Class are
                    invested in a single portfolio of securities, the net asset
                    value of each Class will differ because the Classes have
                    different ongoing distribution fees.

                    The net asset value per share of the Fund is determined once
                    daily at 4:00 p.m. Eastern time, on each day that the New
                    York Stock Exchange is open (or, on days when the New York
                    Stock Exchange closes prior to 4:00 p.m., at such earlier
                    time). Shares will not be priced on days that the New York
                    Stock Exchange is closed.

                    The value of the Fund's portfolio securities is based on the
                    securities' market price when available. When a market price
                    is not readily available, including circumstances under
                    which the Investment Manager determines that a security's
                    market price is not accurate, a portfolio security is valued
                    at its fair value, as determined under procedures
                    established by the Fund's Board of Trustees. In these cases,
                    the Fund's net asset value will reflect certain portfolio
                    securities' fair value rather than their market price.

                    An exception to the Fund's general policy of using market
                    prices concerns its short-term debt portfolio securities.
                    Debt securities with remaining maturities of sixty days or
                    less at the time of purchase are valued at amortized cost.
                    However, if the cost does not reflect the securities' market
                    value, these securities will be valued at their fair value.

[ICON]              HOW TO BUY SHARES
- --------------------------------------------------------------------------------
                    You may open a new account to buy Fund shares or buy
                    additional Fund shares for an existing account by contacting
                    your Morgan Stanley Dean Witter Financial Advisor or other
                    authorized financial representative. Your Financial Advisor
                    will assist you, step-by-step, with the procedures to invest
                    in the Fund. You may also purchase shares directly by
                    calling the Fund's transfer agent and requesting an
                    application.

                    Because every investor has different immediate financial
                    needs and long-term investment goals, the Fund offers
                    investors four Classes of shares: Classes A, B, C and D.
                    Class D shares are only offered to a limited group of
                    investors. Each Class of shares offers a distinct structure
                    of sales charges, distribution and service fees, and other
                    features that are designed to address a variety of needs.
                    Your Financial Advisor or other authorized financial
                    representative can help you decide which Class may be most
                    appropriate for you. When purchasing Fund shares, you must
                    specify which Class of shares you wish to purchase.

 8
<PAGE>
[Sidebar]
EASYINVEST-SM-
A purchase plan that allows you to transfer money automatically from your
checking or savings account or from a Money Market Fund on a semi-monthly,
monthly or quarterly basis. Contact your Morgan Stanley Dean Witter Financial
Advisor for further information about this service.
[End Sidebar]

                    The Fund currently expects to stop selling shares to NEW
                    investors when its net assets reach approximately $2
                    billion; if the Fund does so, shareholders already invested
                    in the Fund will be able to buy additional shares.

                    When you buy Fund shares, the shares are purchased at the
                    next share price calculated (less any applicable front-end
                    sales charge for Class A shares) after we receive your
                    purchase order. Your payment is due on the third business
                    day after you place your purchase order. We reserve the
                    right to reject any order for the purchase of Fund shares.

<TABLE>
<CAPTION>
MINIMUM INVESTMENT AMOUNTS
- ------------------------------------------------------------------------------------------------
                                                                            MINIMUM INVESTMENT
                                                                          ----------------------
 INVESTMENT OPTIONS                                                       INITIAL    ADDITIONAL
<S>                                  <C>                                  <C>        <C>
- ------------------------------------------------------------------------------------------------
 Regular accounts                                                          $ 1,000      $ 100
- ------------------------------------------------------------------------------------------------
 Individual Retirement Accounts:     Regular IRAs                          $ 1,000      $ 100
                                     Education IRAs                           $500      $ 100
- ------------------------------------------------------------------------------------------------
 EASYINVEST-SM-                      (Automatically from your checking
                                     or savings account or Money Market
                                     Fund)                                   $100*      $ 100*
- ------------------------------------------------------------------------------------------------
</TABLE>

*    Provided your schedule of investments totals $1,000 in twelve months.

                    There is no minimum investment amount if you purchase Fund
                    shares through: (1) the Investment Manager's mutual fund
                    asset allocation plan, (2) a program, approved by the Fund's
                    distributor, in which you pay an asset-based fee for
                    advisory, administrative and/or brokerage services, or (3)
                    employer-sponsored employee benefit plan accounts.

                    INVESTMENT OPTIONS FOR CERTAIN INSTITUTIONAL AND OTHER
                    INVESTORS/CLASS D SHARES. To be eligible to purchase Class D
                    shares, you must qualify under one of the investor
                    categories specified in the "Share Class Arrangements"
                    section of this PROSPECTUS.

                    SUBSEQUENT INVESTMENTS SENT DIRECTLY TO THE FUND. In
                    addition to buying additional Fund shares for an existing
                    account by contacting your Morgan Stanley Dean Witter
                    Financial Advisor, you may send a check directly to the
                    Fund. To buy additional shares in this manner:

                    - Write a "letter of instruction" to the Fund specifying the
                      name(s) on the account, the account number, the social
                      security or tax identification number, the Class of shares
                      you wish to purchase and the investment amount (which
                      would include any applicable front-end sales charge). The
                      letter must be signed by the account owner(s).

                    - Make out a check for the total amount payable to: Morgan
                      Stanley Dean Witter Aggressive Equity Fund.

                    - Mail the letter and check to Morgan Stanley Dean Witter
                      Trust FSB at P.O. Box 1040, Jersey City, NJ 07303.

                                                                               9
<PAGE>
[ICON]              HOW TO EXCHANGE SHARES
- --------------------------------------------------------------------------------
                    PERMISSIBLE FUND EXCHANGES. You may exchange shares of any
                    Class of the Fund for the same Class of any other
                    continuously offered Multi-Class Fund, or for shares of a
                    No-Load Fund, a Money Market Fund, North American Government
                    Income Trust or Short-Term U.S. Treasury Trust, without the
                    imposition of an exchange fee. See the inside back cover of
                    this PROSPECTUS for each Morgan Stanley Dean Witter Fund's
                    designation as a Multi-Class Fund, No-Load Fund or Money
                    Market Fund. If a Morgan Stanley Dean Witter Fund is not
                    listed, consult the inside back cover of that Fund's
                    PROSPECTUS for its designation. For purposes of exchanges,
                    shares of FSC Funds (subject to a front-end sales charge)
                    are treated as Class A shares of a Multi-Class Fund.

                    Exchanges may be made after shares of the Fund acquired by
                    purchase have been held for thirty days. There is no waiting
                    period for exchanges of shares acquired by exchange or
                    dividend reinvestment. The current PROSPECTUS for each Fund
                    describes its investment objective(s), policies and
                    investment minimums, and should be read before investment.
                    Since exchanges are available only into continuously offered
                    Morgan Stanley Dean Witter Funds, exchanges are not
                    available into any new Morgan Stanley Dean Witter Fund
                    during its initial offering period, or when shares of a
                    particular Morgan Stanley Dean Witter Fund are not being
                    offered to purchase.

                    EXCHANGE PROCEDURES. You can process an exchange by
                    contacting your Morgan Stanley Dean Witter Financial Advisor
                    or other authorized financial representative. Otherwise, you
                    must forward an exchange privilege authorization form to the
                    Fund's transfer agent -- Morgan Stanley Dean Witter Trust
                    FSB -- and then write the transfer agent or call (800)
                    869-NEWS to place an exchange order. You can obtain an
                    exchange privilege authorization form by contacting your
                    Financial Advisor or other authorized financial
                    representative or by calling (800) 869-NEWS. If you hold
                    share certificates, no exchanges may be processed until we
                    have received all applicable share certificates.

                    An exchange to any Morgan Stanley Dean Witter Fund (except a
                    Money Market Fund) is made on the basis of the next
                    calculated net asset values of the Funds involved after the
                    exchange instructions are accepted. When exchanging into a
                    Money Market Fund, the Fund's shares are sold at their next
                    calculated net asset value and the Money Market Fund's
                    shares are purchased at their net asset value on the
                    following business day.

                    The Fund may terminate or revise the exchange privilege upon
                    required notice. The check writing privilege is not
                    available for Money Market Fund shares you acquire in an
                    exchange.

                    TELEPHONE EXCHANGES. For your protection when calling Morgan
                    Stanley Dean Witter Trust FSB, we will employ reasonable
                    procedures to confirm that exchange instructions
                    communicated over the telephone are genuine. These
                    procedures may include requiring various forms of personal
                    identification such as name, mailing address, social
                    security or other tax identification number. Telephone
                    instructions also may be recorded.

 10
<PAGE>
                    Telephone instructions will be accepted if received by the
                    Fund's transfer agent between 9:00 a.m. and 4:00 p.m.
                    Eastern time, on any day the New York Stock Exchange is open
                    for business. During periods of drastic economic or market
                    changes, it is possible that the telephone exchange
                    procedures may be difficult to implement, although this has
                    not been the case with the Fund in the past.

                    MARGIN ACCOUNTS. If you have pledged your Fund shares in a
                    margin account, contact your Morgan Stanley Dean Witter
                    Financial Advisor or other authorized financial
                    representative regarding restrictions on the exchange of
                    such shares.

                    TAX CONSIDERATIONS OF EXCHANGES. If you exchange shares of
                    the Fund for shares of another Morgan Stanley Dean Witter
                    Fund there are important tax considerations. For tax
                    purposes, the exchange out of the Fund is considered a sale
                    of Fund shares -- and the exchange into the other Fund is
                    considered a purchase. As a result, you may realize a
                    capital gain or loss.

                    You should review the "Tax Consequences" section and consult
                    your own tax professional about the tax consequences of an
                    exchange.

                    FREQUENT EXCHANGES. A pattern of frequent exchanges may
                    result in the Fund limiting or prohibiting, at its
                    discretion, additional purchases and/or exchanges. The Fund
                    will notify you in advance of limiting your exchange
                    privileges.

                    CDSC CALCULATIONS ON EXCHANGES. See the "Share Class
                    Arrangements" section of this PROSPECTUS for a further
                    discussion of how applicable contingent deferred sales
                    charges (CDSCs) are calculated for shares of one Morgan
                    Stanley Dean Witter Fund that are exchanged for shares of
                    another.

                    For further information regarding exchange privileges, you
                    should contact your Morgan Stanley Dean Witter Financial
                    Advisor or call (800) 869-NEWS.

[ICON]              HOW TO SELL SHARES
- --------------------------------------------------------------------------------
                    You can sell some or all of your Fund shares at any time. If
                    you sell Class A, Class B or Class C shares, your net sale
                    proceeds are reduced by the amount of any applicable CDSC.
                    Your shares will be sold at the next price calculated after
                    we receive your order to sell as described below.

<TABLE>
<CAPTION>
 OPTIONS            PROCEDURES
<S>                 <C>
- ------------------------------------------------------------------------------------------
 Contact your       To sell your shares, simply call your Morgan Stanley Dean Witter
 Financial Advisor  Financial Advisor or other authorized financial representative.
                    ----------------------------------------------------------------------
 [ICON]             Payment will be sent to the address to which the account is registered
                    or deposited in your brokerage account.
- ------------------------------------------------------------------------------------------
 By Letter          You can also sell your shares by writing a "letter of instruction"
                    that includes:
 [ICON]             - your account number;
                    - the dollar amount or the number of shares you wish to sell;
                    - the Class of shares you wish to sell; and
                    - the signature of each owner as it appears on the account.
                    ----------------------------------------------------------------------
</TABLE>

                                                                              11
<PAGE>

<TABLE>
<CAPTION>
 OPTIONS            PROCEDURES
<S>                 <C>
- --------------------------------------------------------------------------------
 By Letter,         If you are requesting payment to anyone other than the
 continued          registered owner(s) or that payment be sent to any address
                    other than the address of the registered owner(s) or
                    pre-designated bank account, you will need a signature
                    guarantee. You can obtain a signature guarantee from an
                    eligible guarantor acceptable to Morgan Stanley Dean Witter
                    Trust FSB. (You should contact Morgan Stanley Dean Witter
                    Trust FSB at (800) 869-NEWS for a determination as to
                    whether a particular institution is an eligible guarantor.)
                    A notary public CANNOT provide a signature guarantee.
                    Additional documentation may be required for shares held by
                    a corporation, partnership, trustee or executor.
                    ------------------------------------------------------------
                    Mail the letter to Morgan Stanley Dean Witter Trust FSB at
                    P.O. Box 983, Jersey City, NJ 07303. If you hold share
                    certificates, you must return the certificates, along with
                    the letter and any required additional documentation.
                    ------------------------------------------------------------
                    A check will be mailed to the name(s) and address in which
                    the account is registered, or otherwise according to your
                    instructions.
- --------------------------------------------------------------------------------
 Systematic         If your investment in all of the Morgan Stanley Dean Witter
 Withdrawal Plan    Family of Funds has a total market value of at least
 [ICON]             $10,000, you may elect to withdraw amounts of $25 or more,
                    or in any whole percentage of a Fund's balance (provided the
                    amount is at least $25), on a monthly, quarterly,
                    semi-annual or annual basis, from any Fund with a balance of
                    at least $1,000. Each time you add a Fund to the plan, you
                    must meet the plan requirements.
                    ------------------------------------------------------------
                    Amounts withdrawn are subject to any applicable CDSC. A CDSC
                    may be waived under certain circumstances. See the Class B
                    waiver categories listed in the "Share Class Arrangements"
                    section of this Prospectus.
                    ------------------------------------------------------------
                    To sign up for the Systematic Withdrawal Plan, contact your
                    Morgan Stanley Dean Witter Financial Advisor or call (800)
                    869-NEWS. You may terminate or suspend your plan at any
                    time. Please remember that withdrawals from the plan are
                    sales of shares, not Fund "distributions," and ultimately
                    may exhaust your account balance. The Fund may terminate or
                    revise the plan at any time.
- --------------------------------------------------------------------------------
</TABLE>

                    PAYMENT FOR SOLD SHARES. After we receive your complete
                    instructions to sell as described above, a check will be
                    mailed to you within seven days, although we will attempt to
                    make payment within one business day. Payment may also be
                    sent to your brokerage account.

                    Payment may be postponed or the right to sell your shares
                    suspended under unusual circumstances. If you request to
                    sell shares that were recently purchased by check, payment
                    of the sale proceeds may be delayed for the minimum time
                    needed to verify that the check has been honored (not more
                    than fifteen days from the time we receive the check).

                    TAX CONSIDERATIONS. Normally, your sale of Fund shares is
                    subject to federal and state income tax. You should review
                    the "Tax Consequences" section of this PROSPECTUS and
                    consult your own tax professional about the tax consequences
                    of a sale.

                    REINSTATEMENT PRIVILEGE. If you sell Fund shares and have
                    not previously exercised the reinstatement privilege, you
                    may, within 35 days after the date of sale, invest any
                    portion of the proceeds in the same Class of Fund shares at
                    their net asset value and receive a pro rata credit for any
                    CDSC paid in connection with the sale.

 12
<PAGE>
[Sidebar]
TARGETED DIVIDENDS-SM-
You may select to have your Fund distributions automatically invested in other
Classes of Fund shares or Classes of another Morgan Stanley Dean Witter Fund
that you own. Contact your Morgan Stanley Dean Witter Financial Advisor for
further information about this service.
[End Sidebar]

                    INVOLUNTARY SALES. The Fund reserves the right, on sixty
                    days' notice, to sell the shares of any shareholder (other
                    than shares held in an IRA or 403(b) Custodial Account)
                    whose shares, due to sales by the shareholder, have a value
                    below $100, or in the case of an account opened through
                    EASYINVEST-SM-, if after 12 months the shareholder has
                    invested less than $1,000 in the account.

                    However, before the Fund sells your shares in this manner,
                    we will notify you and allow you sixty days to make an
                    additional investment in an amount that will increase the
                    value of your account to at least the required amount before
                    the sale is processed. No CDSC will be imposed on any
                    involuntary sale.

                    MARGIN ACCOUNTS. If you have pledged your Fund shares in a
                    margin account, contact your Morgan Stanley Dean Witter
                    Financial Advisor or other authorized financial
                    representative regarding restrictions on the sale of such
                    shares.

[ICON]              DISTRIBUTIONS
- --------------------------------------------------------------------------------
                    The Fund passes substantially all of its earnings from
                    income and capital gains along to its investors as
                    "distributions." The Fund earns income from stock
                    investments. These amounts are passed along to Fund
                    shareholders as "income dividend distributions." The Fund
                    realizes capital gains whenever it sells securities for a
                    higher price than it paid for them. These amounts may be
                    passed along as "capital gain distributions."

                    The Fund declares income dividends separately for each
                    Class. Distributions paid on Class A and Class D shares
                    usually will be higher than for Class B and Class C because
                    distribution fees that Class B and Class C pay are higher.
                    Normally, income dividends are distributed to shareholders
                    annually. Capital gains, if any, are usually distributed in
                    December. The Fund, however, may retain and reinvest any
                    long-term capital gains. The Fund may at times make payments
                    from sources other than income or capital gains that
                    represent a return of a portion of your investment.

                    Distributions are reinvested automatically in additional
                    shares of the same Class and automatically credited to your
                    account, unless you request in writing that all
                    distributions be paid in cash. If you elect the cash option,
                    the Fund will mail a check to you no later than seven
                    business days after the distribution is declared. No
                    interest will accrue on uncashed checks. If you wish to
                    change how your distributions are paid, your request should
                    be received by the Fund's transfer agent, Morgan Stanley
                    Dean Witter Trust FSB, at least five business days prior to
                    the record date of the distributions.

[ICON]              TAX CONSEQUENCES
- --------------------------------------------------------------------------------
                    As with any investment, you should consider how your Fund
                    investment will be taxed. The tax information in this
                    PROSPECTUS is provided as general information. You should
                    consult your own tax professional about the tax consequences
                    of an investment in the Fund.

                                                                              13
<PAGE>
                    Unless your investment in the Fund is through a tax-deferred
                    retirement account, such as a 401(k) plan or IRA, you need
                    to be aware of the possible tax consequences when:

                    - The Fund makes distributions; and

                    - You sell Fund shares, including an exchange to another
                      Morgan Stanley Dean Witter Fund.

                    TAXES ON DISTRIBUTIONS. Your distributions are normally
                    subject to federal and state income tax when they are paid,
                    whether you take them in cash or reinvest them in Fund
                    shares. A distribution also may be subject to local income
                    tax. Any income dividend distributions and any short-term
                    capital gain distributions are taxable to you as ordinary
                    income. Any long-term capital gain distributions are taxable
                    as long-term capital gains, no matter how long you have
                    owned shares in the Fund.

                    Every January, you will be sent a statement (IRS Form
                    1099-DIV) showing the taxable distributions paid to you in
                    the previous year. The statement provides full information
                    on your dividends and capital gains for tax purposes.

                    TAXES ON SALES. Your sale of Fund shares normally is subject
                    to federal and state income tax and may result in a taxable
                    gain or loss to you. A sale also may be subject to local
                    income tax. Your exchange of Fund shares for shares of
                    another Morgan Stanley Dean Witter Fund is treated for tax
                    purposes like a sale of your original shares and a purchase
                    of your new shares. Thus, the exchange may, like a sale,
                    result in a taxable gain or loss to you and will give you a
                    new tax basis for your new shares.

                    When you open your Fund account, you should provide your
                    social security or tax identification number on your
                    investment application. By providing this information, you
                    will avoid being subject to a federal backup withholding tax
                    of 31% on taxable distributions and redemption proceeds. Any
                    withheld amount would be sent to the IRS as an advance tax
                    payment.

[ICON]              SHARE CLASS ARRANGEMENTS
- --------------------------------------------------------------------------------
                    The Fund offers several Classes of shares having different
                    distribution arrangements designed to provide you with
                    different purchase options according to your investment
                    needs. Your Morgan Stanley Dean Witter Financial Advisor or
                    other authorized financial representative can help you
                    decide which Class may be appropriate for you.

                    The general public is offered three Classes: Class A shares,
                    Class B shares and Class C shares, which differ principally
                    in terms of sales charges and ongoing expenses. A fourth
                    Class, Class D shares, is offered only to a limited category
                    of investors. Shares that you acquire through reinvested
                    distributions will not be subject to any front-end sales
                    charge or CDSC -- contingent deferred sales charge. Sales
                    personnel may receive different compensation for selling
                    each Class of shares. The sales charges applicable to each
                    Class provide for the distribution financing of shares of
                    that Class.

 14
<PAGE>
[Sidebar]
FRONT-END SALES
CHARGE OR FSC
An initial sales charge you pay when purchasing Class A shares that is based on
a percentage of the offering price. The percentage declines based upon the
dollar value of Class A shares you purchase. We offer three ways to reduce your
Class A sales charges - the Combined Purchase Privilege, Right of Accumulation
and Letter of Intent.
[End Sidebar]
                    The chart below compares the sales charge and the maximum
                    annual 12b-1 fee applicable to each Class:

<TABLE>
<CAPTION>
                                                                            MAXIMUM
CLASS     SALES CHARGE                                                  ANNUAL 12b-1 FEE
<S>       <C>                                                           <C>
- ----------------------------------------------------------------------------------------
 A        Maximum 5.25% initial sales charge reduced for purchase of         0.25%
          $25,000 or more; shares sold without an initial sales charge
          are generally subject to a 1.0% CDSC during the first year
- ----------------------------------------------------------------------------------------
 B        Maximum 5.0% CDSC during the first year decreasing to 0%           1.0%
          after six years
- ----------------------------------------------------------------------------------------
 C        1.0% CDSC during the first year                                    1.0%
- ----------------------------------------------------------------------------------------
 D        None                                                                None
- ----------------------------------------------------------------------------------------
</TABLE>

                     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 purchases of $25,000 or more
                    according to the schedule below. Investments of $1 million
                    or more are not subject to an initial sales charge, but are
                    generally subject to a contingent deferred sales charge, or
                    CDSC, of 1.0% on sales made within one year after the last
                    day of the month of purchase. The CDSC will be assessed in
                    the same manner and with the same CDSC waivers as with Class
                    B shares. Class A shares are also subject to a distribution
                    (12b-1) fee of up to 0.25% of the average daily net assets
                    of the Class.
                    The offering price of Class A shares includes a sales charge
                    (expressed as a percentage of the offering price) on a
                    single transaction as shown in the following table:

<TABLE>
<CAPTION>
                                                       FRONT-END SALES CHARGE
                                          -------------------------------------------------
 AMOUNT OF SINGLE                             PERCENTAGE OF       APPROXIMATE PERCENTAGE OF
 TRANSACTION                              PUBLIC OFFERING PRICE      NET 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                               0.00%                     0.00%
- -------------------------------------------------------------------------------------------
</TABLE>

                    The reduced sales charge schedule is applicable to purchases
                    of Class A shares in a single transaction by:
                    - A single account (including an individual, trust or
                      fiduciary account).
                    - Family member accounts (limited to husband, wife and
                      children under the age of 21).
                    - Pension, profit sharing or other employee benefit plans of
                      companies and their affiliates.
                    - Tax-exempt organizations.

                    - Groups organized for a purpose other than to buy mutual
                      fund shares.

                                                                              15
<PAGE>
                    COMBINED PURCHASE PRIVILEGE. You also will have the benefit
                    of reduced sales charges by combining purchases of Class A
                    shares of the Fund in a single transaction with purchases of
                    Class A shares of other Multi-Class Funds and shares of FSC
                    Funds.

                    RIGHT OF ACCUMULATION. You also may benefit from a reduction
                    of sales charges if the cumulative net asset value of Class
                    A shares of the Fund purchased in a single transaction,
                    together with shares of other Funds you currently own which
                    were previously purchased at a price including a front-end
                    sales charge (including shares acquired through reinvestment
                    of distributions), amounts to $25,000 or more. Also, if you
                    have a cumulative net asset value of all your Class A and
                    Class D shares equal to at least $5 million (or $25 million
                    for certain employee benefit plans), you are eligible to
                    purchase Class D shares of any Fund subject to the Fund's
                    minimum initial investment requirement.

                    You must notify your Morgan Stanley Dean Witter Financial
                    Advisor or other authorized financial representative (or
                    Morgan Stanley Dean Witter Trust FSB if you purchase
                    directly through the Fund), 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 when an order is placed by mail. The
                    reduced sales charge will not be granted if: (i)
                    notification is not furnished at the time of the order; or
                    (ii) a review of the records of Dean Witter Reynolds or
                    other authorized dealer of Fund shares or the Fund's
                    transfer agent does not confirm your represented holdings.

                    LETTER OF INTENT. The schedule of reduced sales charges for
                    larger purchases also will be available to you if you enter
                    into a written "letter of intent." A letter of intent
                    provides for the purchase of Class A shares of the Fund or
                    other Multi-Class Funds or shares of FSC Funds within a
                    thirteen-month period. The initial purchase under a letter
                    of intent must be at least 5% of the stated investment goal.
                    To determine the applicable sales charge reduction, you may
                    also include: (1) the cost of shares of other Morgan Stanley
                    Dean Witter Funds which were previously purchased at a price
                    including a front-end sales charge during the 90-day period
                    prior to the distributor receiving the letter of intent, and
                    (2) the cost of shares of other Funds you currently own
                    acquired in exchange for shares of Funds purchased during
                    that period at a price including a front-end sales charge.
                    You can obtain a letter of intent by contacting your Morgan
                    Stanley Dean Witter Financial Advisor or other authorized
                    financial representative, or by calling (800) 869-NEWS. If
                    you do not achieve the stated investment goal within the
                    thirteen-month period, you are required to pay the
                    difference between the sales charges otherwise applicable
                    and sales charges actually paid, which may be deducted from
                    your investment.

                    OTHER SALES CHARGE WAIVERS. In addition to investments of $1
                    million or more, your purchase of Class A shares is not
                    subject to a front-end sales charge (or a CDSC upon sale) if
                    your account qualifies under one of the following
                    categories:

                    - A trust for which Morgan Stanley Dean Witter Trust FSB
                      provides discretionary trustee services.

 16
<PAGE>
[Sidebar]
CONTINGENT DEFERRED SALES CHARGE OR CDSC
A fee you pay when you sell shares of certain Morgan Stanley Dean Witter Funds
purchased without an initial sales charge. This fee declines the longer you hold
your shares as set forth in the table.
[End Sidebar]
                    -Persons participating in a fee-based investment program
                    (subject to all of its terms and conditions, including
                    mandatory sale or transfer restrictions on termination)
                    approved by the Fund's distributor pursuant to which they
                    pay an asset-based fee for investment advisory,
                    administrative and/or brokerage services.

                    -Employer-sponsored employee benefit plans, whether or not
                    qualified under the Internal Revenue Code, for which Morgan
                    Stanley Dean Witter Trust FSB serves as trustee or Dean
                    Witter Reynolds' Retirement Plan Services serves as
                    recordkeeper under a written Recordkeeping Services
                    Agreement ("MSDW Eligible Plans") which have at least 200
                    eligible employees.

                    -An MSDW Eligible Plan whose Class B shares have converted
                    to Class A shares, regardless of the plan's asset size or
                    number of eligible employees.

                    -A client of a Morgan Stanley Dean Witter Financial Advisor
                    who joined us from another investment firm within six months
                    prior to the date of purchase of Fund shares, and you used
                    the proceeds from the sale of shares of a proprietary mutual
                    fund of that Financial Advisor's previous firm that imposed
                    either a front-end or deferred sales charge to purchase
                    Class A shares, provided that: (1) you sold the shares not
                    more than 60 days prior to the purchase of Fund shares, and
                    (2) the sale proceeds were maintained in the interim in cash
                    or a money market fund.

                    -Current or retired Directors/Trustees of the Morgan Stanley
                    Dean Witter Funds, such persons' spouses and children under
                    the age of 21, and trust accounts for which any of such
                    persons is a beneficiary.

                    -Current or retired directors, officers and employees of
                    Morgan Stanley Dean Witter & Co. and any of its
                    subsidiaries, such persons' spouses and children under the
                    age of 21, and trust accounts for which any such persons is
                    a beneficiary.

                     CLASS B SHARES  Class B shares are offered at net asset
                    value with no initial sales charge but are subject to a
                    contingent deferred sales charge, or CDSC, as set forth in
                    the table below. For the purpose of calculating the CDSC,
                    shares are deemed to have been purchased on the last day of
                    the month during which they were purchased.

<TABLE>
<CAPTION>
 YEAR SINCE PURCHASE PAYMENT MADE         CDSC AS A PERCENTAGE 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>

                                                                              17
<PAGE>
                    Each time you place an order to sell or exchange shares,
                    shares with no CDSC will be sold or exchanged first, then
                    shares with the lowest CDSC will be sold or

 18
<PAGE>
                    exchanged next. For any shares subject to a CDSC, the CDSC
                    will be assessed on an amount equal to the lesser of the
                    current market value or the cost of the shares being sold.

                    CDSC WAIVERS. A CDSC, if otherwise applicable, will be
                    waived in the case of:

                    - Sales of shares held at the time you die or become
                      disabled (within the definition in Section 72(m)(7) of the
                      Internal Revenue Code which relates to the ability to
                      engage in gainful employment), if the shares are: (i)
                      registered either in your name (not a trust) or in the
                      names of you and your spouse as joint tenants with right
                      of survivorship; or (ii) held in a qualified corporate or
                      self-employed retirement plan, IRA or 403(b) Custodial
                      Account, provided in either case that the sale is
                      requested within one year of your death or initial
                      determination of disability.

                    - Sales in connection with the following retirement plan
                      "distributions": (i) 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); (ii) distributions from an IRA or 403(b) Custodial
                      Account following attainment of age 59 1/2; or (iii) a
                      tax-free return of an excess IRA contribution (a
                      "distribution" does not include a direct transfer of IRA,
                      403(b) Custodial Account or retirement plan assets to a
                      successor custodian or trustee).

                    - Sales of shares held for you as a participant in an MSDW
                      Eligible Plan.

                    - Sales of shares in connection with the Systematic
                      Withdrawal Plan of up to 12% annually of the value of each
                      Fund from which plan sales are made. The percentage is
                      determined on the date you establish the Systematic
                      Withdrawal Plan and based on the next calculated share
                      price. You may have this CDSC waiver applied in amounts up
                      to 1% per month, 3% per quarter, 6% semi-annually or 12%
                      annually. Shares with no CDSC will be sold first, followed
                      by those with the lowest CDSC. As such, the waiver benefit
                      will be reduced by the amount of your shares that are not
                      subject to a CDSC. If you suspend your participation in
                      the plan, you may later resume plan payments without
                      requiring a new determination of the account value for the
                      12% CDSC waiver.

                    All waivers will be granted only following the Fund's
                    distributor receiving confirmation of your entitlement. If
                    you believe you are eligible for a CDSC waiver, please
                    contact your Financial Advisor or call (800) 869-NEWS.

                    DISTRIBUTION FEE. Class B shares are subject to an annual
                    12b-1 fee of 1.0% of the average daily net assets of Class
                    B.

                    CONVERSION FEATURE. After ten (10) years, Class B shares
                    will convert automatically to Class A shares of the Fund
                    with no initial sales charge. The ten year period runs 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, from the last day of the month in which the
                    original Class B shares were purchased; the shares will
                    convert to Class A shares based on their relative net asset
                    values in the month following the

                                                                              19
<PAGE>
                    ten year period. At the same time, an equal proportion of
                    Class B shares acquired through automatically reinvested
                    distributions will convert to Class A shares on the same
                    basis. (Class B shares acquired in exchange for shares of
                    another Morgan Stanley Dean Witter Fund originally purchased
                    before May 1, 1997, however, will convert to Class A shares
                    in May 2007.)

                    In the case of Class B shares held in an MSDW Eligible Plan,
                    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 Class B shares of a Morgan Stanley Dean Witter Fund
                    purchased by that plan.

                    Currently, the Class B share conversion is not a taxable
                    event; the conversion feature may be cancelled if it is
                    deemed a taxable event in the future by the Internal Revenue
                    Service.

                    If you exchange your Class B shares for shares of a Money
                    Market Fund, a No-Load Fund, North American Government
                    Income Trust or Short-Term U.S. Treasury Trust, the holding
                    period for conversion is frozen as of the last day of the
                    month of the exchange and resumes on the last day of the
                    month you exchange back into Class B shares.

                    EXCHANGING SHARES SUBJECT TO A CDSC. There are special
                    considerations when you exchange Fund shares that are
                    subject to a CDSC. When determining the length of time you
                    held the shares and the corresponding CDSC rate, any period
                    (starting at the end of the month) during which you held
                    shares of a fund that does NOT charge a CDSC WILL NOT BE
                    COUNTED. Thus, in effect the "holding period" for purposes
                    of calculating the CDSC is frozen upon exchanging into a
                    fund that does not charge a CDSC.

                    For example, if you held Class B shares of the Fund in a
                    regular account for one year, exchanged to Class B of
                    another Morgan Stanley Dean Witter Multi-Class Fund for
                    another year, then sold your shares, a CDSC rate of 4% would
                    be imposed on the shares based on a two year holding period
                    -- one year for each Fund. However, if you had exchanged the
                    shares of the Fund for a Money Market Fund (which does not
                    charge a CDSC) instead of the Multi-Class Fund, then sold
                    your shares, a CDSC rate of 5% would be imposed on the
                    shares based on a one year holding period. The one year in
                    the Money Market Fund would not be counted. Nevertheless, if
                    shares subject to a CDSC are exchanged for a Fund that does
                    not charge a CDSC, you will receive a credit when you sell
                    the shares equal to the distribution (12b-1) fees, if any,
                    you paid on those shares while in that Fund up to the amount
                    of any applicable CDSC.

                    In addition, shares that are exchanged into or from a Morgan
                    Stanley Dean Witter Fund subject to a higher CDSC rate will
                    be subject to the higher rate, even if the shares are
                    re-exchanged into a Fund with a lower CDSC rate.

 20
<PAGE>
                     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 sales made within one year after the last day of the
                    month of purchase. The CDSC will be assessed in the same
                    manner and with the same CDSC waivers as with Class B
                    shares.

                    DISTRIBUTION FEE. Class C shares are subject to an annual
                    distribution (12b-1) fee of up to 1.0% of the average daily
                    net assets of that Class. 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. Unlike Class
                    B shares, Class C shares have no conversion feature and,
                    accordingly, an investor that purchases Class C shares may
                    be subject to distribution (12b-1) fees applicable to Class
                    C shares for an indefinite period.

                     CLASS D SHARES  Class D shares are offered without any
                    sales charge on purchases or sales and without any
                    distribution (12b-1) fee. Class D shares are offered only to
                    investors meeting an initial investment minimum of $5
                    million ($25 million for MSDW Eligible Plans) and the
                    following investor categories:

                    - Investors participating in the Investment Manager's mutual
                      fund asset allocation program (subject to all of its terms
                      and conditions, including mandatory sale or transfer
                      restrictions on termination) pursuant to which they pay an
                      asset-based fee.

                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      mandatory sale or transfer restrictions on termination)
                      approved by the Fund's distributor pursuant to which they
                      pay an asset-based fee for investment advisory,
                      administrative and/or brokerage services.

                    - Employee benefit plans maintained by Morgan Stanley Dean
                      Witter & Co. or any of its subsidiaries for the benefit of
                      certain employees of Morgan Stanley Dean Witter & Co. and
                      its subsidiaries.

                    - Certain unit investment trusts sponsored by Dean Witter
                      Reynolds.

                    - Certain other open-end investment companies whose shares
                      are distributed by the Fund's distributor.

                    - Investors who were shareholders of the Dean Witter
                      Retirement Series on September 11, 1998 for additional
                      purchases for their former Dean Witter Retirement Series
                      accounts.

                    MEETING CLASS D ELIGIBILITY MINIMUMS. To meet the $5 million
                    ($25 million for MSDW Eligible Plans) initial investment to
                    qualify to purchase Class D shares you may combine: (1)
                    purchases in a single transaction of Class D shares of the
                    Fund and other Morgan Stanley Dean Witter Multi-Class Funds
                    and/or (2) previous purchases of Class A and Class D shares
                    of Multi-Class Funds and shares of FSC Funds you currently
                    own, along with shares of Morgan Stanley Dean Witter Funds
                    you currently own that you acquired in exchange for those
                    shares.

                                                                              21
<PAGE>
                     NO SALES CHARGES FOR REINVESTED CASH DISTRIBUTIONS  If you
                    receive a cash payment representing an income dividend or
                    capital gain and you reinvest that amount in the applicable
                    Class of shares by returning the check within 30 days of the
                    payment date, the purchased shares would not be subject to
                    an initial sales charge or CDSC.

                     PLAN OF DISTRIBUTION (RULE 12B-1 FEES)  The Fund has
                    adopted a Plan of Distribution in accordance with Rule 12b-1
                    under the Investment Company Act of 1940 with respect to the
                    distribution of Class A, Class B and Class C shares. The
                    Plan allows the Fund to pay distribution fees for the sale
                    and distribution of these shares. It also allows the Fund to
                    pay for services to shareholders of Class A, Class B and
                    Class C shares. Because these fees are paid out of the
                    Fund's assets on an ongoing basis, over time these fees will
                    increase the cost of your investment in these Classes and
                    may cost you more than paying other types of sales charges.

 22
<PAGE>
FINANCIAL HIGHLIGHTS

        The financial highlights table is intended to help you understand the
        Fund's financial performance for the life of the Fund. Certain
        information reflects financial results for a single Fund share
        throughout each year. The total returns in the table represent the rate
        an investor would have earned or lost on an investment in the Fund
        (assuming reinvestment of all dividends and distributions).

        This information has been audited by PricewaterhouseCoopers LLP,
        independent accountants, whose report, along with the Fund's financial
        statements, is included in the annual report, which is available upon
        request.

<TABLE>
<CAPTION>
                                                                   FOR THE PERIOD FEBRUARY 24, 1999*
                                                                        THROUGH JULY 31, 1999**
<S>                                                              <C>
- ------------------------------------------------------------------------------------------------------

 CLASS B SHARES
- ------------------------------------------------------------------------------------------------------

 SELECTED PER SHARE DATA:
- ------------------------------------------------------------------------------------------------------
 Net asset value, beginning of period                                            $10.00
- ------------------------------------------------------------------------------------------------------
 INCOME (LOSS) FROM INVESTMENT OPERATIONS:
    Net investment loss                                                           (0.04)
    Net realized and unrealized gain                                               0.88
                                                                               --------
 Total income from investment operations                                           0.84
- ------------------------------------------------------------------------------------------------------
 Net asset value, end of period                                                  $10.84
- ------------------------------------------------------------------------------------------------------

 TOTAL RETURN+(1)                                                                  8.40%
- ------------------------------------------------------------------------------------------------------

 RATIOS TO AVERAGE NET ASSETS(2)(3):
- ------------------------------------------------------------------------------------------------------
 Expenses                                                                          2.06%
- ------------------------------------------------------------------------------------------------------
 Net investment loss                                                              (0.91)%
- ------------------------------------------------------------------------------------------------------

 SUPPLEMENTAL DATA:
- ------------------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                                      $ 665,848
- ------------------------------------------------------------------------------------------------------
 Portfolio turnover rate(1)                                                         177%
- ------------------------------------------------------------------------------------------------------
</TABLE>

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

 22
<PAGE>

<TABLE>
<CAPTION>
                                                        FOR THE PERIOD FEBRUARY 24, 1999*
                                                             THROUGH JULY 31, 1999**
<S>                                                    <C>
- -------------------------------------------------------------------------------------------
 CLASS A
- -------------------------------------------------------------------------------------------
 SELECTED PER SHARE DATA:
- -------------------------------------------------------------------------------------------
 Net asset value, beginning of period                                 $10.00
- -------------------------------------------------------------------------------------------
 INCOME (LOSS) FROM INVESTMENT OPERATIONS:
    Net investment loss                                                (0.01)
    Net realized and unrealized gain                                    0.88
                                                                     -------
 Total income from investment operations                                0.87
- -------------------------------------------------------------------------------------------
 Net asset value, end of period                                       $10.87
- -------------------------------------------------------------------------------------------
 TOTAL RETURN+(1)                                                       8.70%
- -------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS(2)(3):
- -------------------------------------------------------------------------------------------
 Expenses                                                               1.31%
- -------------------------------------------------------------------------------------------
 Net investment loss                                                   (0.16)%
- -------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA:
- -------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                             $32,165
- -------------------------------------------------------------------------------------------
 Portfolio turnover rate(1)                                              177%
- -------------------------------------------------------------------------------------------
</TABLE>

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

<TABLE>
<CAPTION>
                                                        FOR THE PERIOD FEBRUARY 24, 1999*
                                                             THROUGH JULY 31, 1999**
<S>                                                    <C>
- -------------------------------------------------------------------------------------------
 CLASS C
- -------------------------------------------------------------------------------------------
 SELECTED PER SHARE DATA:
- -------------------------------------------------------------------------------------------
 Net asset value, beginning of period                                 $10.00
- -------------------------------------------------------------------------------------------
 INCOME (LOSS) FROM INVESTMENT OPERATIONS:
    Net investment loss                                                (0.04)
    Net realized and unrealized gain                                    0.88
                                                                     -------
 Total income from investment operations                                0.84
- -------------------------------------------------------------------------------------------
 Net asset value, end of period                                       $10.84
- -------------------------------------------------------------------------------------------
 TOTAL RETURN+(1)                                                       8.40%
- -------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS(2)(3):
- -------------------------------------------------------------------------------------------
 Expenses                                                               2.06%
- -------------------------------------------------------------------------------------------
 Net investment loss                                                   (0.91)%
- -------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA:
- -------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                             $64,053
- -------------------------------------------------------------------------------------------
 Portfolio turnover rate(1)                                              177%
- -------------------------------------------------------------------------------------------
</TABLE>

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

                                                                              23
<PAGE>

<TABLE>
<CAPTION>
                                                       FOR THE PERIOD FEBRUARY 24, 1999*
                                                            THROUGH JULY 31, 1999**
<S>                                                    <C>
- -----------------------------------------------------------------------------------------

 CLASS D
- -----------------------------------------------------------------------------------------

 SELECTED PER SHARE DATA:
- -----------------------------------------------------------------------------------------
 Net asset value, beginning of period                                $10.00
- -----------------------------------------------------------------------------------------
 INCOME (LOSS) FROM INVESTMENT OPERATIONS:
    Net investment loss                                                  --
    Net realized and unrealized gain                                   0.89
                                                                     ------
 Total income from investment operations                               0.89
- -----------------------------------------------------------------------------------------
 Net asset value, end of period                                      $10.89
- -----------------------------------------------------------------------------------------

 TOTAL RETURN+(1)                                                      8.90%
- -----------------------------------------------------------------------------------------

 RATIOS TO AVERAGE NET ASSETS(2)(3):
- -----------------------------------------------------------------------------------------
 Expenses                                                              1.06%
- -----------------------------------------------------------------------------------------
 Net investment income                                                 0.09%
- -----------------------------------------------------------------------------------------

 SUPPLEMENTAL DATA:
- -----------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                               $316
- -----------------------------------------------------------------------------------------
 Portfolio turnover rate(1)                                             177%
- -----------------------------------------------------------------------------------------
</TABLE>

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

 24
<PAGE>
MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS
        The Morgan Stanley Dean Witter Family of Funds offers investors a wide
        range of investment choices. Come on in and meet the family!
- --------------------------------------------------------------------------------
 GROWTH FUNDS
- --------------------------------
GROWTH FUNDS
Aggressive Equity Fund
American Opportunities Fund
Capital Growth Securities
Developing Growth Securities
Growth Fund
Market Leader Trust
Mid-Cap Equity Trust
Small Cap Growth Fund
Special Value Fund

THEME FUNDS
Financial Services Trust
Health Sciences Trust
Information Fund
Natural Resource Development Securities
Precious Metals and Minerals Trust

GLOBAL/INTERNATIONAL FUNDS
Competitive Edge Fund - "Best Ideas"
 Portfolio
European Growth Fund
Fund of Funds - International Portfolio
International Fund
International SmallCap Fund
Japan Fund
Latin American Growth Fund
Pacific Growth Fund
- --------------------------------------------------------------------------------
 GROWTH AND INCOME FUNDS
- --------------------------------
Balanced Growth Fund
Balanced Income Fund
Convertible Securities Trust
Dividend Growth Securities
Equity Fund
Fund of Funds - Domestic Portfolio
Income Builder Fund
Mid-Cap Dividend Growth Securities
S&P 500 Index Fund
S&P 500 Select Fund
Strategist Fund
Total Market Index Fund
Total Return Trust
Value Fund
Value-Added Market Series/Equity Portfolio

THEME FUNDS
Global Utilities Fund
Real Estate Fund
Utilities Fund

GLOBAL FUNDS
Global Dividend Growth Securities
- --------------------------------------------------------------------------------
 INCOME FUNDS
- --------------------------------
GOVERNMENT INCOME FUNDS
Federal Securities Trust
Short-Term U.S. Treasury Trust
U.S. Government Securities Trust

DIVERSIFIED INCOME FUNDS
Diversified Income Trust

CORPORATE INCOME FUNDS
High Yield Securities
Intermediate Income Securities
Short-Term Bond Fund (NL)

GLOBAL INCOME FUNDS
North American Government Income Trust
World Wide Income Trust

TAX-FREE INCOME FUNDS
California Tax-Free Income Fund
Hawaii Municipal Trust (FSC)
Limited Term Municipal Trust (NL)
Multi-State Municipal Series Trust (FSC)
New York Tax-Free Income Fund
Tax-Exempt Securities Trust
- --------------------------------------------------------------------------------
 MONEY MARKET FUNDS
- --------------------------------
TAXABLE MONEY MARKET FUNDS
Liquid Asset Fund (MM)
U.S. Government Money Market Trust (MM)

TAX-FREE MONEY MARKET FUNDS
California Tax-Free Daily Income Trust (MM)
N.Y. Municipal Money Market Trust (MM)
Tax-Free Daily Income Trust (MM)

There may be Funds created after this PROSPECTUS was published. Please consult
the inside back cover of a new Fund's prospectus for its designation, e.g.,
Multi-Class Fund or Money Market Fund.

Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
North American Government Income Trust and Short-Term U.S. Treasury Trust, is a
Multi-Class Fund. A Multi-Class Fund is a mutual fund offering multiple Classes
of shares. The other types of funds are: NL - No-Load (Mutual) Fund; MM - Money
Market Fund; FSC - A mutual fund sold with a front-end sales charge and a
distribution (12b-1) fee.
<PAGE>
MORGAN STANLEY DEAN WITTER
AGGRESSIVE EQUITY FUND

                    Additional information about the Fund's investments is
                    available in the Fund's ANNUAL AND SEMI-ANNUAL REPORTS TO
                    SHAREHOLDERS. In the Fund's ANNUAL REPORT, you will find a
                    discussion of the market conditions and investment
                    strategies that significantly affected the Fund's
                    performance during its last fiscal year. The Fund's
                    Statement of Additional Information also provides additional
                    information about the Fund. The Statement of Additional
                    Information is incorporated herein by reference (legally is
                    part of this PROSPECTUS). For a free copy of any of these
                    documents, to request other information about the Fund, or
                    to make shareholder inquiries, please call:

                                           (800) 869-NEWS

                    You also may obtain information about the Fund by calling
                    your Morgan Stanley Dean Witter Financial Advisor or by
                    visiting our Internet site at:

                                   www.msdw.com/individual/funds

                    Information about the Fund (including the STATEMENT OF
                    ADDITIONAL INFORMATION) can be viewed and copied at the
                    Securities and Exchange Commission's Public Reference Room
                    in Washington, DC. Information about the Reference Room's
                    operations may be obtained by calling the SEC at (800)
                    SEC-0330. Reports and other information about the Fund are
                    available on the SEC's Internet site (www.sec.gov) and
                    copies of this information may be obtained, upon payment of
                    a duplicating fee, by writing the Public Reference Section
                    of the SEC, Washington, DC 20549-6009.

                                         A MUTUAL FUND THAT SEEKS CAPITAL GROWTH

(THE FUND'S INVESTMENT COMPANY ACT FILE NO. IS 811-8471)


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