WITTER DEAN S&P 500 INDEX FUND
497, 1998-04-14
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                                               Filed Pursuant to Rule 497(e)
                                               Registration File No.: 333-29721

DEAN WITTER 
S&P 500 INDEX FUND 
PROSPECTUS -- MARCH 31, 1998 
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Dean Witter S&P 500 Index Fund (the "Fund") is an open-end, diversified 
management investment company whose investment objective is to provide 
investment results that, before expenses, correspond to the total return 
(i.e., the combination of capital changes and income) of the Standard & 
Poor's(Registered Trademark) 500 Composite Stock Price Index (the "S&P 500 
Index"). The Fund seeks to meet its investment objective by investing, under 
normal circumstances, at least 80% of the value of its total assets in common 
stocks included in the S&P 500 Index in approximately the same weightings as 
the Index. (See "Investment Objective and Policies.") 

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

This Prospectus sets forth concisely the information you should know before 
investing in the Fund. It should be read and retained for future reference. 
Additional information about the Fund is contained in the Statement of 
Additional Information, dated March 31, 1998, which has been filed with the 
Securities and Exchange Commission, and which is available at no charge upon 
request of the Fund at the address or telephone numbers listed on this page. 
The Statement of Additional Information is incorporated herein by reference. 

TABLE OF CONTENTS 

Prospectus Summary ....................................................      2 
Summary of Fund Expenses ..............................................      4 
Financial Highlights ..................................................      5 
The Fund and its Management ...........................................      6 
Investment Objective and Policies .....................................      6 
 Risk Considerations and Investment Practices .........................      7 
Investment Restrictions ...............................................     10 
Purchase of Fund Shares ...............................................     10 
Shareholder Services ..................................................     18 
Redemptions and Repurchases ...........................................     21 
Dividends, Distributions and Taxes ....................................     21 
Performance Information ...............................................     22 
Additional Information ................................................     22 
Financial Statements (unaudited)-- February 28, 1998 ..................     24 

Shares of the Fund are not deposits or obligations of, or guaranteed or 
endorsed by, any bank, and the shares are not federally insured by the 
Federal Deposit Insurance Corporation, the Federal Reserve Board, or any 
other agency. 

DEAN WITTER 
S&P 500 INDEX FUND 
TWO WORLD TRADE CENTER 
NEW YORK, NEW YORK 10048 
(212) 392-2550 OR 
(800) 869-NEWS (TOLL-FREE) 

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 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS
                              A CRIMINAL OFFENSE.

                   Dean Witter Distributors Inc., Distributor

<PAGE>

PROSPECTUS SUMMARY 
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THE                  The Fund is organized as a trust, commonly known as a
FUND                 Massachusetts business trust, and is an open-end,
                     diversified management investment company. The Fund
                     invests primarily in common stocks included in the
                     Standard & Poor's(Registered Trademark) 500 Composite
                     Stock Price Index (the "S&P 500 Index").
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SHARES OFFERED       Shares of beneficial interest with $0.01 par value (see
                     page 22). The Fund offers four Classes of shares, each
                     with a different combination of sales charges, ongoing
                     fees and other features (see pages 10-18).
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MINIMUM PURCHASE     The minimum initial investment for each Class is $1,000
                     ($100 if the account is opened through EasyInvest (Service
                     Mark)). Class D shares are only available to persons
                     investing $5 million ($25 million for certain qualified
                     plans) or more and to certain other limited categories of
                     investors. For the purpose of meeting the minimum $5
                     million (or $25 million) investment for Class D shares,
                     and subject to the $1,000 minimum initial investment for
                     each Class of the Fund, an investor's existing holdings of
                     Class A shares and shares of funds for which Dean Witter
                     InterCapital Inc. serves as investment manager ("Dean
                     Witter Funds") that are sold with a front-end sales
                     charge, and concurrent investments in Class D shares of
                     the Fund and other Dean Witter Funds that are multiple
                     class funds, will be aggregated. The minimum subsequent
                     investment is $100 (see page 10).
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INVESTMENT           The investment objective of the Fund is to provide  
OBJECTIVE            investment results that, before expenses, correspond to
                     the total return (i.e., the combination of capital changes
                     and income) of the S&P 500 Index (see page 6).
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INVESTMENT MANAGER   Dean Witter InterCapital Inc., the Investment Manager of
                     the Fund, and its wholly-owned subsidiary, Dean Witter
                     Services Company Inc., serve in various investment
                     management, advisory, management and administrative
                     capacities to 101 investment companies and other
                     portfolios with net assets under management of
                     approximately $110 billion at February 28, 1998 (see
                     page 6).
- -------------------------------------------------------------------------------
MANAGEMENT FEE       The Investment Manager receives a monthly fee at the
                     annual rate of 0.40% of the Fund's average daily net
                     assets. The Investment Manager has agreed to assume all
                     expenses (except for brokerage and 12b-1 fees) and to
                     waive the compensation provided for in its Management
                     Agreement to the extent that such expenses and
                     compensation on an annualized basis exceed 0.50% of the
                     daily net assets of the Fund (see page 6).
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DISTRIBUTOR AND      Dean Witter Distributors Inc. (the "Distributor"). The  
DISTRIBUTION FEE     Fund has adopted a distribution plan pursuant to Rule
                     12b-1 under the Investment Company Act (the "12b-1 Plan")
                     with respect to the distribution fees paid by the Class A,
                     Class B and Class C shares of the Fund to the Distributor.
                     The entire 12b-1 fee payable by Class A and a portion of
                     the 12b-1 fee payable by each of Class B and Class C equal
                     to 0.25% of the average daily net assets of the Class are
                     currently each characterized as a service fee within the
                     meaning of the National Association of Securities Dealers,
                     Inc. guidelines. The remaining portion of the 12b-1 fee,
                     if any, is characterized as an asset-based sales charge
                     (see pages 10 and 17).
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ALTERNATIVE          Four classes of shares are offered:
PURCHASE            
ARRANGEMENTS         o Class A shares are offered with a front-end sales
                     charge, starting at 5.25% and reduced for larger
                     purchases. Investments of $1 million or more (and
                     investments by certain other limited categories of
                     investors) are not subject to any sales charge at the time
                     of purchase but a contingent deferred sales charge
                     ("CDSC") of 1.0% may be imposed on redemptions within one
                     year of purchase. The Fund is authorized to reimburse the
                     Distributor for specific expenses incurred in promoting
                     the distribution of the Fund's Class A shares and
                     servicing shareholder accounts pursuant to the Fund's
                     12b-1 Plan. Reimbursement may in no event exceed an amount
                     equal to payments at an annual rate of 0.25% of average
                     daily net assets of the Class (see pages 10, 13 and 17).
<PAGE>
                     o Class B shares are offered without a front-end sales
                     charge, but will in most cases be subject to a CDSC
                     (scaled down from 5.0% to 1.0%) if redeemed within six
                     years after purchase. The CDSC will be imposed on any
                     redemption of shares if after such redemption the
                     aggregate current value of a Class B account with the Fund
                     falls below the aggregate amount of the investor's
                     purchase payments made during the six years preceding the
                     redemption. A different CDSC schedule applies to
                     investments by certain qualified plans. Class B shares are
                     also subject to a 12b-1 fee assessed at the annual rate of
                     1.0% of the average daily net assets of Class B. Class B
                     shares convert to Class A shares approximately ten years
                     after the date of the original purchase (see pages 10, 14
                     and 17).
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2

<PAGE>

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                     o Class C shares are offered without a front-end sales
                     charge, but will in most cases be subject to a CDSC of
                     1.0% if redeemed within one year after purchase. The Fund
                     is authorized to reimburse the Distributor for specific
                     expenses incurred in promoting the distribution of the
                     Fund's Class C shares and servicing shareholder accounts
                     pursuant to the Fund's 12b-1 Plan. Reimbursement may in no
                     event exceed an amount equal to payments at an annual rate
                     of 1.0% of average daily net assets of the Class (see
                     pages 10, 16 and 17).

                     o Class D shares are offered only to investors meeting an
                     initial investment minimum of $5 million ($25 million for
                     certain qualified plans) and to certain other limited
                     categories of investors. Class D shares are offered
                     without a front-end sales charge or CDSC and are not
                     subject to any 12b-1 fee (see pages 10, 16 and 17).
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DIVIDENDS AND        Dividends from net investment income and distributions 
CAPITAL GAINS        from net capital gains, if any, are paid at least once  
DISTRIBUTIONS        each year. The Fund may, however, determine to retain all
                     or part of any net long-term capital gains in any year for
                     reinvestment. Dividends and capital gains distributions
                     paid on shares of a Class are automatically reinvested in
                     additional shares of the same Class at net asset value
                     unless the shareholder elects to receive cash. Shares
                     acquired by dividend and distribution reinvestment will
                     not be subject to any sales charge or CDSC (see pages 18
                     and 21).
- -------------------------------------------------------------------------------
REDEMPTION           Shares are redeemable by the shareholder at net asset
                     value less any applicable CDSC on Class A, Class B or
                     Class C shares. An account may be involuntarily redeemed
                     if the total value of the account is less than $100 or, if
                     the account was opened through EasyInvest (Service Mark),
                     if after twelve months the shareholder has invested less
                     than $1,000 in the account (see page 21).
- -------------------------------------------------------------------------------
RISK CONSIDERATIONS  An investment in the Fund should be considered a long-term
                     holding and subject to all the risks associated with
                     investing in equity securities. The market value of the
                     Fund's portfolio securities and, therefore, the Fund's net
                     asset value per share, will increase or decrease due to a
                     variety of economic, market or political factors which
                     cannot be predicted. The Fund operates as a "straight"
                     index fund and will therefore not be actively managed; as
                     such, the adverse performance of a portfolio security will
                     ordinarily not result in the elimination of the security
                     from the Fund's portfolio. The Fund may enter into
                     repurchase agreements, may lend its portfolio securities
                     and may utilize transactions involving stock index futures
                     which may be considered speculative in nature and may
                     involve greater risks than those customarily assumed by
                     other investment companies which do not invest in such
                     instruments. An investment in shares of the Fund should
                     not be considered a complete investment program and is not
                     appropriate for all investors. Investors should carefully
                     consider their ability to assume these risks and the risks
                     outlined under the heading "Risk Considerations and
                     Investment Practices" (page 7) before making an investment
                     in the Fund.
- -------------------------------------------------------------------------------
 The above is qualified in its entirety by the detailed information appearing
 elsewhere in this Prospectus and in the Statement of Additional Information.

                                                                              3
<PAGE>

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

   The following table illustrates all expenses and fees that a shareholder 
of the Fund will incur. The estimated annualized fees and expenses set forth 
in the table below are based on the expenses and fees for the fiscal period 
ending August 31, 1998. 

<TABLE>
<CAPTION>
                                                                      CLASS A      CLASS B       CLASS C      CLASS D 
                                                                      -------      -------       -------      ------- 
<S>                                                                    <C>           <C>          <C>          <C>
SHAREHOLDER TRANSACTION EXPENSES 
Maximum Sales Charge Imposed on Purchases (as a percentage of 
 offering price) .................................................     5.25%(1)      None         None         None 
Sales Charge Imposed on Dividend Reinvestments ...................     None          None         None         None 
Maximum Contingent Deferred Sales Charge (as a percentage of 
 original purchase price or redemption proceeds)..................     None(2)       5.00%(3)     1.00%(4)     None 
Redemption Fees...................................................     None          None         None         None 
Exchange Fee......................................................     None          None         None         None 

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET 
 ASSETS) 
Management Fees+ .................................................     0.23%         0.23%        0.23%        0.23% 
12b-1 Fees (5)(6).................................................     0.24%         1.00%        1.00%        None 
Other Expenses+ ..................................................     0.27%         0.27%        0.27%        0.27% 
Total Fund Operating Expenses+....................................     0.74%         1.50%        1.50%        0.50% 
</TABLE>

- ------------ 
+      The Investment Manager has agreed to assume all expenses (except for 
       brokerage and 12b-1 fees) and to waive the compensation provided for in 
       its Investment Management Agreement to the extent that such expenses 
       and compensation on an annualized basis exceed 0.50% of the daily net 
       assets of the Fund. The fees and expenses disclosed above reflect the 
       assumption of such expenses and waiver of compensation by the 
       Investment Manager to the extent that such expenses and compensation on 
       an annualized basis exceed 0.50% of the daily net assets of the Fund. 
(1)    Reduced for purchases of $25,000 and over (see "Purchase of Fund 
       Shares--Initial Sales Charge Alternative--Class A Shares"). 
(2)    Investments that are not subject to any sales charge at the time of 
       purchase are subject to a CDSC of 1.00% that will be imposed on 
       redemptions made within one year after purchase, except for certain 
       specific circumstances (see "Purchase of Fund Shares--Initial Sales 
       Charge Alternative--Class A Shares"). 
(3)    The CDSC is scaled down to 1.00% during the sixth year, reaching zero 
       thereafter. 
(4)    Only applicable to redemptions made within one year after purchase (see 
       "Purchase of Fund Shares--Level Load Alternative--Class C Shares"). 
(5)    The 12b-1 fee is accrued daily and payable monthly. The entire 12b-1 
       fee payable by Class A and a portion of the 12b-1 fee payable by each 
       of Class B and Class C equal to 0.25% of the average daily net assets 
       of the Class are currently each characterized as a service fee within 
       the meaning of National Association of Securities Dealers, Inc. 
       ("NASD") guidelines and are payments made for personal service and/or 
       maintenance of shareholder accounts. The remainder of the 12b-1 fee, if 
       any, is an asset-based sales charge, and is a distribution fee paid to 
       the Distributor to compensate it for the services provided and the 
       expenses borne by the Distributor and others in the distribution of the 
       Fund's shares (see "Purchase of Fund Shares--Plan of Distribution"). 
(6)    Upon conversion of Class B shares to Class A shares, such shares will 
       be subject to the lower 12b-1 fee applicable to Class A shares. No 
       sales charge is imposed at the time of conversion of Class B shares to 
       Class A shares. Class C shares do not have a conversion feature and, 
       therefore, are subject to an ongoing 1.00% distribution fee (see 
       "Purchase of Fund Shares--Alternative Purchase Arrangements"). 

<TABLE>
<CAPTION>
EXAMPLES                                                                        1 YEAR    3 YEARS 
                                                                                ------    -------
<S>                                                                               <C>       <C>
You would pay the following expenses on a $1,000 investment assuming (1) a 5% 
annual return and (2) redemption at the end of each time period: 
  Class A ....................................................................    $60       $75 
  Class B ....................................................................    $65       $77 
  Class C ....................................................................    $25       $47 
  Class D ....................................................................    $ 5       $16 

You would pay the following expenses on the same $1,000 investment assuming 
no redemption at the end of the period: 
  Class A ....................................................................    $60       $75 
  Class B ....................................................................    $15       $47 
  Class C ....................................................................    $15       $47 
  Class D ....................................................................    $ 5       $16 
</TABLE>

THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF FUTURE 
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS MAY BE GREATER OR LESS 
THAN THOSE SHOWN. 
<PAGE>
The purpose of this table is to assist the investor in understanding the 
various costs and expenses that an investor in the Fund will bear directly or 
indirectly. For a more complete description of these costs and expenses, see 
"The Fund and its Management," "Purchase of Fund Shares--Plan of 
Distribution" and "Redemptions and Repurchases." 

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

4

<PAGE>

FINANCIAL HIGHLIGHTS (unaudited) 
- ----------------------------------------------------------------------------- 

The following ratios and per share data for a share of beneficial interest 
outstanding throughout the period have been taken from the records of the 
Fund without examination by the independent accountants. The financial 
highlights should be read in conjunction with the unaudited financial 
statements and the notes thereto which are contained in this Prospectus 
commencing on page 24. 

<TABLE>
<CAPTION>
                                            FOR THE PERIOD SEPTEMBER 26, 1997* THROUGH FEBRUARY 28, 1998++ 
                                            --------------------------------------------------------------
                                                CLASS A       CLASS B         CLASS C        CLASS D 
                                                SHARES         SHARES          SHARES         SHARES 
                                                ------         ------          ------         ------ 
<S>                                             <C>            <C>             <C>            <C>    
PER SHARE OPERATING PERFORMANCE: 
 Net asset value, beginning of period  .....    $10.00         $10.00          $10.00         $10.00 
                                                ------         ------          ------         ------ 
 Net investment income .....................      0.05           0.02            0.02           0.06 
 Net realized and unrealized gain ..........      1.10           1.09            1.09           1.09 
                                                ------         ------          ------         ------ 
 Total from investment operations ..........      1.15           1.11            1.11           1.15 
                                                ------         ------          ------         ------ 
 Less dividends from net investment income       (0.03)         (0.01)          (0.01)         (0.03) 
                                                ------         ------          ------         ------ 
 Net asset value, end of period ............    $11.12         $11.10          $11.10         $11.12 
                                                ======         ======          ======         ======
TOTAL INVESTMENT RETURN+ (1) ...............     11.47%         11.09%          11.08%         11.53% 

RATIOS TO AVERAGE NET ASSETS (2) (3): 
 Expenses ..................................      0.74%          1.50%           1.50%          0.50% 
 Net investment income .....................      1.10%          0.36%           0.37%          1.29% 

SUPPLEMENTAL DATA: 
 Net assets, end of period, in thousands ...   $19,089       $380,009         $24,126        $12,705 
 Portfolio turnover rate (1) ...............         1%             1%              1%             1% 
 Average commission rate paid ..............   $0.0157        $0.0157         $0.0157        $0.0157 
</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)    If the Fund had borne all of its expenses that were reimbursed or 
       waived by the Investment Manager, the annualized expense and net 
       investment income ratios would have been 0.91% and 0.93%, respectively, 
       for Class A shares, 1.67% and 0.19%, respectively, for Class B shares, 
       1.67% and 0.20%, respectively, for Class C shares and 0.67% and 1.12%, 
       respectively, for Class D shares. 

                                                                              5
<PAGE>

THE FUND AND ITS MANAGEMENT 
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Dean Witter S&P 500 Index Fund (the "Fund") is an open-end, diversified
management investment company. The Fund is a trust of the type commonly known
as a "Massachusetts business trust" and was organized under the laws of The
Commonwealth of Massachusetts on June 18, 1997.

   Dean Witter InterCapital Inc. ("InterCapital" or the "Investment 
Manager"), whose address is Two World Trade Center, New York, New York 10048, 
is the Fund's Investment Manager. The Investment Manager, which was 
incorporated in July, 1992, is a wholly-owned subsidiary of Morgan Stanley 
Dean Witter & Co., a preeminent global financial services firm that maintains 
leading market positions in each of its three primary businesses -- 
securities, asset management and credit services. 

   InterCapital and its wholly-owned subsidiary, Dean Witter Services Company 
Inc., serve in various investment management, advisory, management and 
administrative capacities to 101 investment companies, 28 of which are listed 
on the New York Stock Exchange, with combined assets of approximately $106 
billion at February 28, 1998. The Investment Manager also manages portfolios 
of pension plans, other institutions and individuals which aggregated 
approximately $4 billion at such date. 

   The Fund has retained the Investment Manager to provide administrative 
services, manage its business affairs and manage the investment of the Fund's 
assets, including the placing of orders for the purchase and sale of 
portfolio securities. InterCapital has retained Dean Witter Services Company 
Inc. to perform the aforementioned administrative services for the Fund. 

   The Fund's Trustees review the various services provided by the Investment 
Manager to ensure that the Fund's general investment policies and programs 
are being properly carried out and that administrative services are being 
provided to the Fund in a satisfactory manner. 

   As full compensation for the services and facilities furnished to the Fund 
and for expenses of the Fund incurred by the Investment Manager, the Fund 
pays the Investment Manager monthly compensation calculated daily by applying 
the annual rate of 0.40% to the Fund's net assets. The Investment Manager has 
agreed to assume all expenses (except for brokerage and 12b-1 fees) and to 
waive the compensation provided for in its Management Agreement to the extent 
that such expenses and compensation on an annualized basis exceed 0.50% of 
the daily net assets of the Fund. 

   The Fund's expenses include: the fee of the Investment Manager; the fee 
pursuant to the Plan of Distribution (see "Purchase of Fund Shares"); taxes; 
transfer agent, custodian, auditing fees; certain legal fees, and printing 
and other expenses relating to the Fund's operations which are not expressly 
assumed by the Investment Manager under its Investment Management Agreement 
with the Fund. 

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

   The investment objective of the Fund is to provide investment results 
that, before expenses, correspond to the total return (i.e., the combination 
of capital changes and income) of the Standard & Poor's(Registered Trademark) 
500 Composite Stock Price Index (the "S&P 500 Index"). The objective is a 
fundamental policy of the Fund and may not be changed without a vote of a 
majority of the outstanding voting securities of the Fund. There is no 
assurance that the objective will be achieved. The following policies may be 
changed by the Board of Trustees without shareholder approval. 

   The Fund seeks to achieve its objective by investing, under normal 
circumstances, at least 80% of its total assets in common stocks included in 
the S&P 500 Index in approximately the same weightings as the Index. The Fund 
intends to invest in substantially all of the stocks that comprise the S&P 
500 Index in approximately the same weightings as they are represented in the 
Index. The Fund operates as a "straight" index fund and will not be actively 
managed; as such, adverse performance of a security will ordinarily not 
result in the elimination of the security from the Fund's portfolio. The Fund 
will remain invested in common stocks even when stock prices are generally 
falling. Ordinarily, portfolio securities will not be sold except to reflect 
additions or deletions of the stocks that comprise the S&P 500 Index, 
including mergers, reorganizations and similar transactions, or as may be 
necessary to satisfy redemption requests. 

   Over the long term, the Investment Manager seeks a correlation between the 
performance of the Fund, before expenses, and that of the S&P 500 Index of 
0.95 or better. A figure of 1.00 would indicate perfect correlation. The 
Fund's ability to correlate its performance, before expenses, with the S&P 
500 Index may be affected by, among other things, changes in securities 
markets, the manner in which the S&P 500 Index is calculated and the 

6

<PAGE>

timing of purchases and redemptions. The Fund's ability to correlate its 
performance to the Index also depends to some extent on the size of the 
Fund's portfolio and the size of cash flows into and out of the Fund. To 
accomodate these cash flows, investment changes may be made to maintain the 
similarity of the Fund's portfolio to the S&P 500 Index to the maximum 
practicable extent. The Investment Manager regularly monitors the correlation 
and, in the event the desired correlation is not achieved, the Investment 
Manager will determine what additional investment changes may need to be 
made. 

STOCK INDEX FUTURES CONTRACTS. The Fund may purchase and sell stock index 
futures contracts ("futures contracts") that are traded on U.S. commodity 
exchanges on the S&P 500 Index ("stock index" futures). As a futures contract 
purchaser, the Fund incurs an obligation to take delivery of a specified 
amount of the obligation underlying the contract at a specified time in the 
future for a specified price. As a seller of a futures contract, the Fund 
incurs an obligation to deliver the specified amount of the underlying 
obligation at a specified time in return for an agreed upon price. The Fund 
will purchase or sell stock index futures contracts for the following 
reasons: to simulate full investment in the S&P 500 Index while retaining a 
cash balance for fund management purposes, to facilitate trading, to reduce 
transaction costs or to seek higher investment returns when a futures 
contract is priced more attractively than stocks comprising the S&P 500 
Index. The Fund may enter into such instruments provided that not more than 
5% of its assets are required as an initial margin deposit and provided that 
the contract prices of the stock index futures contracts do not exceed 20% of 
its total assets. While such instruments can be used as leveraged 
investments, the Fund may not use them to leverage its assets. 

ADDITIONAL INFORMATION CONCERNING THE S&P 500 INDEX. The S&P 500 Index is a 
well-known stock market index that includes common stocks of 500 companies 
from several industrial sectors representing a significant portion of the 
market value of all common stocks publicly traded in the United States, most 
of which are listed on the New York Stock Exchange Inc. (the "NYSE"). Stocks 
in the S&P 500 Index are weighted according to their market capitalization 
(i.e., the number of shares outstanding multiplied by the stock's current 
price). The Investment Manager believes that the performance of the S&P 500 
Index is representative of the performance of publicly traded common stocks 
in general. The composition of the S&P 500 Index is determined by S&P and is 
based on such factors as the market capitalization and trading activity of 
each stock and its adequacy as a representation of stocks in a particular 
industry group, and may be changed from time to time. 

   "Standard & Poor's(Registered Trademark)," "S&P(Registered Trademark)," 
"S&P 500(Registered Trademark)," "Standard & Poor's 500," and "500" are 
trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use 
by the Fund. The Fund is not sponsored, endorsed, sold or promoted by 
Standard & Poor's, a division of The McGraw Hill Companies, Inc. ("Standard & 
Poor's") and Standard & Poor's makes no representation regarding the 
advisability of investing in the Fund. 

   The Fund may also invest in Standard & Poor's Depositary Receipts, 
repurchase agreements and zero coupon securities and may lend its portfolio 
securities, as discussed under "Risk Considerations and Investment Practices" 
below. 

   The Fund reserves the right to seek to achieve its investment objective by 
converting to a "master/feeder" fund structure (see "Additional 
Information"). 

RISK CONSIDERATIONS AND INVESTMENT PRACTICES 

The net asset value of the Fund's shares will fluctuate with changes in the 
market value of the Fund's portfolio securities. The market value of the 
Fund's portfolio securities will increase or decrease due to a variety of 
economic, market or political factors which cannot be predicted. 

RISKS OF FUTURES TRANSACTIONS. The Fund may close out its position as a buyer 
or seller of a futures contract only if a liquid secondary market exists for 
futures contracts of that series. There is no assurance that such a market 
will exist. Also, exchanges may limit the amount by which the price of many 
futures contracts may move on any day. If the price moves equal the daily 
limit on successive days, then it may prove impossible to liquidate a futures 
position until the daily limit moves have ceased. 

   The extent to which the Fund may enter into transactions involving futures 
contracts may be limited by the Internal Revenue Code's requirements for 
qualification as a regulated investment company and the Fund's intention to 
qualify as such. See "Dividends, Distributions and Taxes." 

   There may exist an imperfect correlation between the price movements of 
futures contracts purchased by the Fund and the movements in the prices of 
the securities which are the subject of the contract. If participants in the 
futures market elect to close out their contracts through offsetting 
transactions rather than meet margin deposit requirements, distortions in the 
normal relationship between the securities and futures markets could result. 

                                                                              7
<PAGE>

CASH FLOWS; EXPENSES. The ability of the Fund to meet its investment 
objective depends to some extent on the Investment Manager's ability to 
manage cash flows (primarily from purchases and redemptions and distributions 
from the Fund's portfolio investments). Generally, the Investment Manager 
will employ stock index futures to provide liquidity necessary to meet 
anticipated redemptions or for day-to-day operating purposes. In addition, if 
considered appropriate in the opinion of the Investment Manager, a portion of 
a Fund's assets not exceeding 20% of its total assets may be invested in 
money market instruments. The Investment Manager will also make investment 
changes to the Fund's portfolio to accommodate cash flows while continuing to 
seek to replicate the total return of the S&P 500 Index. Investors should 
also be aware that the investment performance of the S&P 500 Index is a 
hypothetical number which does not take into account brokerage commissions 
and other transaction costs, custody and other costs of investing, which will 
be borne by the Fund, and any incremental operating costs (e.g., transfer 
agency, accounting) borne by the Fund. Finally, since the Fund seeks to 
provide investment results that, before expenses, correspond to the total 
return of the S&P 500 Index. S&P 500 Index, the Investment Manager will 
generally not attempt to judge the merits of any particular security as an 
investment. 

TEMPORARY INVESTMENTS. A portion of the Fund's assets, not exceeding 20% of 
its total assets, may be invested temporarily in money market instruments 
under any one or more of the following circumstances: (a) pending investment 
of proceeds of sale of shares of the Fund; (b) pending settlement of 
purchases of portfolio securities; or (c) to maintain liquidity for the 
purposes of meeting anticipated redemptions. The money market instruments in 
which the Fund may invest are certificates of deposit of U.S. domestic banks 
with assets of $1 billion or more; bankers' acceptances; time deposits; U.S. 
Government and U.S. Government agency securities; or commercial paper rated 
within the two highest grades by S&P or Moody's Investors Service, Inc., or, 
if not rated, are of comparable quality as determined by the Trustees, and 
which mature within one year from the date of purchase. 

FOREIGN SECURITIES. The Fund may purchase common stocks, including American 
Depository Receipts, of foreign corporations represented in the S&P 500 Index 
(such securities are listed on the New York Stock Exchange, the American 
Stock Exchange or the NASDAQ Market System). Investments in foreign 
securities may be affected by changes in governmental administration or 
economic policy (in the United States and abroad) or changed circumstances in 
dealings between nations. Foreign companies may be subject to less 
governmental regulation than U.S. companies. Securities of foreign companies 
may be more volatile than securities of U.S. companies. As noted above, the 
Fund's investment in common stock of foreign corporations represented in the 
S&P 500 Index may also be in the form of American Depository Receipts (ADRs). 
ADRs are receipts typically issued by a United States bank or trust company 
evidencing ownership of the underlying securities and are designed for use in 
the U.S. securities markets. 

STANDARD & POOR'S DEPOSITARY RECEIPTS ("SPDRS"). The Fund may purchase 
interests in a unit investment trust holding a portfolio of securities linked 
to the S&P 500 Index. SPDRs closely track the underlying portfolio of 
securities, trade like a share of common stock and pay periodic dividends 
proportionate to those paid by the portfolio of stocks that comprise the S&P 
500 Index. The Fund may invest up to 10% of its total assets in the aggregate 
in SPDRs and up to 5% of its total assets in SPDRs issued by a single unit 
investment trust. As a holder of interests in a unit investment trust, the 
Fund would indirectly bear its ratable share of that unit investment trust's 
expenses. At the same time the Fund would continue to pay its own management 
and advisory fees and other expenses, as a result of which the Fund and its 
shareholders in effect will be absorbing duplicate levels of fees with 
respect to investments in such unit investment trusts. The liquidity of small 
holdings of SPDRs will depend upon the existence and liquidity of a secondary 
market. See the Statement of Additional Information for a further discussion 
of SPDRs. 

REPURCHASE AGREEMENTS. The Fund may enter into repurchase agreements, which 
may be viewed as a type of secured lending by the Fund, and which typically 
involve the acquisition by the Fund of debt securities from a selling 
financial institution such as a bank, savings and loan association or 
broker-dealer. The agreement provides that the Fund will sell back to the 
institution, and that the institution will repurchase, the underlying 
security at a specified price and at a fixed time in the future, usually not 
more than seven days from the date of purchase. While repurchase agreements 
involve certain risks not associated with direct investments in debt 
securities, including the risks of default or bankruptcy of the selling 
financial institution, the Fund follows procedures designed to minimize such 
risks. These procedures include effecting repurchase transactions only with 
large, well-capitalized and well-established financial institutions and 
maintaining adequate collateralization. 

ZERO COUPON SECURITIES. A portion of the money market instruments in which 
the Fund may invest may be zero coupon securities. Such securities are 
purchased at a discount from their face amount, giving the purchaser the 
right to receive their full value at maturity. The interest earned on such 
securities is, implicitly, automatically 

8

<PAGE>

compounded and paid out at maturity. While such compounding at a constant 
rate eliminates the risk of receiving lower yields upon reinvestment of 
interest if prevailing interest rates decline, the owner of a zero coupon 
security will be unable to participate in higher yields upon reinvestment of 
interest received on interest-paying securities if prevailing interest rates 
rise. 

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

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

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

   Except as specifically noted, all investment policies and practices 
discussed above are not fundamental policies of the Fund and, as such, may be 
changed without shareholder approval. 

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

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

PORTFOLIO MANAGEMENT 

The Fund's portfolio is managed by its Investment Manager with a view to 
achieving the Fund's investment objective. The assets of the Fund are managed 
within InterCapital's Growth Group, which manages 26 equity funds and fund 
portfolios with approximately $9 billion in assets as of February 28, 1998. 
Kenton J. Hinchliffe, Senior Vice President of InterCapital and a member of 
InterCapital's Growth Group, is the primary portfolio manager of the Fund. 
Mr. Hinchliffe has been a portfolio manager at InterCapital for over 5 years. 

   Orders for transactions in portfolio securities and commodities are placed 
for the Fund with a number of brokers and dealers, including Dean Witter 
Reynolds Inc. ("DWR"), Morgan Stanley & Co. Incorporated and other brokers 
and dealers that are affiliates of the Investment Manager. The Fund may incur 
brokerage commissions on transactions conducted through such affiliates. 
Pursuant to an order of the Securities and Exchange Commission, the Fund may 
effect principal transactions in certain money market instruments with DWR. 
It is not anticipated that the portfolio trading will result in the Fund's 
portfolio turnover rate exceeding 100% in any one year. Ordinarily, 
securities will be sold from the portfolio only to reflect certain 
administrative changes in the S&P 500 Index or to accommodate cash flows into 
or out of the Fund while maintaining the similarity of the Fund to the 

                                                                              9
<PAGE>

S&P 500 Index. The Fund will incur brokerage costs commensurate with its 
portfolio turnover rate. See "Dividends, Distributions and Taxes" for a 
discussion of the tax implications of the Fund's trading policy. 

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

   The investment restrictions listed below are among the restrictions which 
have been adopted by the Fund as fundamental policies. Under the Act, a 
fundamental policy may not be changed without the vote of a majority of the 
outstanding voting securities of the Fund, as defined in the Act. For 
purposes of the following limitations: (i) all percentage limitations apply 
immediately after a purchase or initial investment; and (ii) any subsequent 
change in any applicable percentage resulting from market fluctuations or 
other changes in total or net assets does not require elimination of any 
security from the portfolio. 

   The Fund may not: 

   1. As to 75% of its total assets, invest more than 5% of the value of its 
total assets in the securities of any one issuer (other than obligations 
issued, or guaranteed by, the United States Government, its agencies or 
instrumentalities), except that the Fund may invest all or substantially all 
of its assets in another registered investment company having the same 
investment objective and policies and substantially the same investment 
restrictions as the Fund (a "Qualifying Portfolio"). 

   2. As to 75% of its total assets, purchase more than 10% of all 
outstanding voting securities or any class of securities of any one issuer, 
except that the Fund may invest all or substantially all of its assets in a 
Qualifying Portfolio. 

   3. Invest 25% or more of the value of its total assets in securities of 
issuers in any one industry. This restriction does not apply to obligations 
issued or guaranteed by the United States Government or its agencies or 
instrumentalities. 

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

GENERAL 

   Dean Witter Distributors Inc. (the "Distributor") will act as the 
Distributor of each Class of the Fund's shares during the continuous 
offering. Pursuant to a Distribution Agreement between the Fund and the 
Distributor, an affiliate of the Investment Manager, shares of the Fund are 
distributed by the Distributor and offered by DWR and other dealers which 
have entered into selected dealer agreements with the Distributor ("Selected 
Broker-Dealers"). The principal executive office of the Distributor is 
located at Two World Trade Center, New York, New York 10048. 

   The Fund offers four classes of shares (each, a "Class"). Class A shares 
are sold to investors with an initial sales charge that declines to zero for 
larger purchases; however, Class A shares sold without an initial sales 
charge are subject to a contingent deferred sales charge ("CDSC") of 1.0% if 
redeemed within one year of purchase, except for certain specific 
circumstances. Class B shares are sold without an initial sales charge but 
are subject to a CDSC (scaled down from 5.0% to 1.0%) payable upon most 
redemptions within six years after purchase. (Class B shares purchased by 
certain qualified plans are subject to a CDSC scaled down from 2.0% to 1.0% 
if redeemed within three years after purchase.) Class C shares are sold 
without an initial sales charge but are subject to a CDSC of 1.0% on most 
redemptions made within one year after purchase. Class D shares are sold 
without an initial sales charge or CDSC and are available only to investors 
meeting an initial investment minimum of $5 million ($25 million for certain 
qualified plans), and to certain other limited categories of investors. At 
the discretion of the Board of Trustees of the Fund, Class A shares may be 
sold to categories of investors in addition to those set forth in this 
prospectus at net asset value without a front-end sales charge, and Class D 
shares may be sold to certain other categories of investors, in each case as 
may be described in the then current prospectus of the Fund. See "Alternative 
Purchase Arrangements -- Selecting a Particular Class" for a discussion of 
factors to consider in selecting which Class of shares to purchase. 

   The minimum initial purchase is $1,000 for each Class of shares, although 
Class D shares are only available to persons investing $5 million ($25 
million for certain qualified plans) or more and to certain other limited 
categories of investors. For the purpose of meeting the minimum $5 million 
(or $25 million) initial investment for Class D shares, and subject to the 
$1,000 minimum initial investment for each Class of the Fund, an investor's 
existing holdings of Class A shares of the Fund and other Dean Witter Funds 
that are multiple class funds ("Dean Witter Multi-Class Funds") and shares of 

10

<PAGE>

Dean Witter Funds sold with a front-end sales charge ("FSC Funds") and 
concurrent investments in Class D shares of the Fund and other Dean Witter 
Multi-Class Funds will be aggregated. Subsequent purchases of $100 or more 
may be made by sending a check, payable to Dean Witter S&P 500 Index Fund, 
directly to Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent" or 
"MSDW Trust") at P.O. Box 1040, Jersey City, NJ 07303 or by contacting an 
account executive of DWR or other Selected Broker-Dealer. When purchasing 
shares of the Fund, investors must specify whether the purchase is for Class 
A, Class B, Class C or Class D shares. If no Class is specified, the Transfer 
Agent will not process the transaction until the proper Class is identified. 
The minimum initial purchase in the case of investments through EasyInvest 
(Service Mark), an automatic purchase plan (see "Shareholder Services"), is 
$100, provided that the schedule of automatic investments will result in 
investments totalling at least $1,000 within the first twelve months. The 
minimum initial purchase in the case of an "Education IRA" is $500, if the 
Distributor has reason to believe that additional investments will increase 
the investment in the account to $1,000 within three years. In the case of 
investments pursuant to (i) Systematic Payroll Deduction Plans (including 
Individual Retirement Plans), (ii) the InterCapital mutual fund asset 
allocation program and (iii) fee-based programs approved by the Distributor, 
pursuant to which participants pay an asset based fee for services in the 
nature of investment advisory, administrative and/or brokerage services, the 
Fund, in its discretion, may accept investments without regard to any minimum 
amounts which would otherwise be required, provided, in the case of 
Systematic Payroll Deduction Plans, that the Distributor has reason to 
believe that additional investments will increase the investment in all 
accounts under such Plans to at least $1,000. Certificates for shares 
purchased will not be issued unless a request is made by the shareholder in 
writing to the Transfer Agent. 

   Shares of the Fund are sold through the Distributor on a normal three 
business day settlement basis; that is, payment is due on the third business 
day (settlement date) after the order is placed with the Distributor. Since 
DWR and other Selected Broker-Dealers forward investors' funds on settlement 
date, they will benefit from the temporary use of the funds if payment is 
made prior thereto. As noted above, orders placed directly with the Transfer 
Agent must be accompanied by payment. Investors will be entitled to receive 
income dividends and capital gains distributions if their order is received 
by the close of business on the day prior to the record date for such 
dividends and distributions. Sales personnel of a Selected Broker-Dealer are 
compensated for selling shares of the Fund by the Distributor and/or the 
Selected Broker-Dealer. In addition, some sales personnel of the Selected 
Broker-Dealer will receive various types of non-cash compensation as special 
sales incentives, including trips, educational and/or business seminars and 
merchandise. The Fund and the Distributor reserve the right to reject any 
purchase orders. 

ALTERNATIVE PURCHASE ARRANGEMENTS 

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

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

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

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

                                                                             11
<PAGE>

CLASS B SHARES. Class B shares are offered at net asset value with no initial 
sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%) if 
redeemed within six years of purchase. (Class B shares purchased by certain 
qualified plans are subject to a CDSC scaled down from 2.0% to 1.0% if 
redeemed within three years after purchase.) This CDSC may be waived for 
certain redemptions. Class B shares are also subject to an annual 12b-1 fee 
of 1.0% of the average daily net assets of Class B. The Class B shares' 
distribution fee will cause that Class to have higher expenses and pay lower 
dividends than Class A or Class D shares. 

   After approximately ten (10) years, Class B shares will convert 
automatically to Class A shares of the Fund, based on the relative net asset 
values of the shares of the two Classes on the conversion date. In addition, 
a certain portion of Class B shares that have been acquired through the 
reinvestment of dividends and distributions will be converted at that time. 
See "Contingent Deferred Sales Charge Alternative--Class B Shares." 

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

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

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

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

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

   For the purpose of meeting the $5 million (or $25 million) minimum 
investment amount for Class D shares, holdings of Class A shares in all Dean 
Witter Multi-Class Funds, shares of FSC Funds and shares of Dean Witter Funds 
for which such shares have been exchanged, will be included together with the 
current investment amount. 

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

12

<PAGE>

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

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

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

INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES 

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

   The offering price of Class A shares will be the net asset value per share 
next determined following receipt of an order (see "Determination of Net 
Asset Value" below), plus a sales charge (expressed as a percentage of the 
offering price) on a single transaction as shown in the following table: 

<TABLE>
<CAPTION>
                                SALES CHARGE 
                                ------------ 
                       PERCENTAGE OF     APPROXIMATE 
  AMOUNT OF SINGLE    PUBLIC OFFERING   PERCENTAGE OF 
     TRANSACTION           PRICE       AMOUNT INVESTED 
     -----------           -----       --------------- 
<S>                        <C>              <C>
Less than $25,000  ..      5.25%            5.54% 
$25,000 but less 
 than $50,000 .......      4.75%            4.99% 
$50,000 but less 
 than $100,000 ......      4.00%            4.17% 
$100,000 but less 
 than $250,000 ......      3.00%            3.09% 
$250,000 but less 
 than $1 million  ...      2.00%            2.04% 
$1 million and over           0                0 
</TABLE>

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

   The above schedule of sales charges is applicable to purchases in a single 
transaction by, among others: (a) an individual; (b) an individual, his or 
her spouse and their children under the age of 21 purchasing shares for his, 
her or their own accounts; (c) a trustee or other fiduciary purchasing shares 
for a single trust estate or a single fiduciary account; (d) a pension, 
profit-sharing or other employee benefit plan qualified or non-qualified 
under Section 401 of the Internal Revenue Code; (e) tax-exempt organizations 
enumerated in Section 501(c)(3) or (13) of the Internal Revenue Code; (f) 
employee benefit plans qualified under Section 401 of the Internal Revenue 
Code of a single employer or of employers who are "affiliated persons" of 
each other within the meaning of Section 2(a)(3)(c) of the Act; and for 
investments in Individual Retirement Accounts of employees of a single 
employer through Systematic Payroll Deduction plans; or (g) any other 
organized group of persons, whether incorporated or not, provided the 
organization has been in existence for at least six months and has some 
purpose other than the purchase of redeemable securities of a registered 
investment company at a discount. 

COMBINED PURCHASE PRIVILEGE. Investors may have the benefit of reduced sales 
charges in accordance with the above schedule by combining purchases of Class 
A shares of the Fund in single transactions with the purchase of Class A 
shares of other Dean Witter Multi-Class Funds and shares of FSC Funds. The 
sales charge payable on the purchase of the Class A shares of the Fund, the 
Class A shares of the other Dean Witter Multi-Class Funds and the shares of 
the FSC Funds will 

                                                                             13
<PAGE>

be at their respective rates applicable to the total amount of the combined 
concurrent purchases of such shares. 

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

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

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

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

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

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

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

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

   (5) investors who are clients of a Dean Witter account executive who 
joined Dean Witter from another investment firm within six months prior to 
the date of purchase of Fund shares by such investors, if the shares are 
being purchased with the proceeds from a redemption of shares of an open-end 
proprietary mutual fund of the account executive's previous firm which 
imposed either a front-end or deferred sales charge, provided such purchase 
was made within sixty days after the redemption and the proceeds of the 
redemption had been maintained in the interim in cash or a money market fund; 
and 

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

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

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

CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES 

Class B shares are sold at net asset value next determined without an initial 
sales charge so that the full 

14

<PAGE>

amount of an investor's purchase payment may be immediately invested in the 
Fund. A CDSC, however, will be imposed on most Class B shares redeemed within 
six years after purchase. The CDSC will be imposed on any redemption of 
shares if after such redemption the aggregate current value of a Class B 
account with the Fund falls below the aggregate amount of the investor's 
purchase payments for Class B shares made during the six years (or, in the 
case of shares held by certain Qualified Retirement Plans, three years) 
preceding the redemption. In addition, Class B shares are subject to an 
annual 12b-1 fee of 1.0% of the average daily net assets of Class B. 

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

<TABLE>
<CAPTION>
         YEAR SINCE 
          PURCHASE            CDSC AS A PERCENTAGE 
        PAYMENT MADE           OF AMOUNT REDEEMED 
        ------------           ------------------ 
<S>                                   <C>
First......................           5.0% 
Second.....................           4.0% 
Third......................           3.0% 
Fourth.....................           2.0% 
Fifth......................           2.0% 
Sixth......................           1.0% 
Seventh and thereafter ....           None 
</TABLE>

   In the case of Class B shares of the Fund purchased by Qualified 
Retirement Plans for which MSDW Trust serves as Trustee or DWR's Retirement 
Plan Services serves as recordkeeper pursuant to a written Recordkeeping 
Services Agreement, shares held for three years or more after purchase 
(calculated as described in the paragraph above) will not be subject to any 
CDSC upon redemption. However, shares redeemed earlier than three years after 
purchase may be subject to a CDSC (calculated as described in the paragraph 
above), the percentage of which will depend on how long the shares have been 
held, as set forth in the following table: 

<TABLE>
<CAPTION>
         YEAR SINCE 
          PURCHASE            CDSC AS A PERCENTAGE 
        PAYMENT MADE           OF AMOUNT REDEEMED 
        ------------           ------------------ 
<S>                                   <C>
First .....................           2.0% 
Second ....................           2.0% 
Third .....................           1.0% 
Fourth and thereafter  ....           None 
</TABLE>

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

   In addition, the CDSC, if otherwise applicable, will be waived in the case 
of: 

   (1) redemptions of shares held at the time a shareholder dies or becomes 
disabled, only if the shares are: (A) registered either in the name of an 
individual shareholder (not a trust), or in the names of such shareholder and 
his or her spouse as joint tenants with right of survivorship; or   (B) held 
in a qualified corporate or self-employed retirement plan, Individual 
Retirement Account ("IRA") or Custodial Account under Section 403(b)(7) of 
the Internal Revenue Code ("403(b) Custodial Account"), provided in either 
case that the redemption is requested within one year of the death or initial 
determination of disability; 

   (2) redemptions in connection with the following retirement plan 
distributions:   (A) lump-sum or other distributions from a qualified 
corporate or self-employed retirement plan following retirement (or, in the 
case of a "key employee" of a "top heavy" plan, following attainment of age 
59 1/2);   (B) distributions from an IRA or 403(b) Custodial Account following 
attainment of age 59 1/2; or   (C) a tax-free return of an excess contribution 
to an IRA; and 
<PAGE>
   (3) all redemptions of shares held for the benefit of a participant in a 
Qualified Retirement Plan which offers investment companies managed by the 
Investment Manager or its subsidiary, Dean Witter Services Company Inc., as 
self-directed investment alternatives and for which MSDW Trust serves as 
Trustee or DWR's Retirement Plan Services serves as recordkeeper pursuant to 
a written Recordkeeping Services Agreement ("Eligible Plan"), provided that 
either:   (A) the plan continues to be an Eligible Plan after the redemption; 
or   (B) the redemption is in connection with the complete termination of the 
plan involving the distribution of all plan assets to participants. 

                                                                             15
<PAGE>

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

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

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

   Effectiveness of the conversion feature is subject to the continuing 
availability of a ruling of the Internal Revenue Service or an opinion of 
counsel that (i) the conversion of shares does not constitute a taxable event 
under the Internal Revenue Code, (ii) Class A shares received on conversion 
will have a basis equal to the shareholder's basis in the converted Class B 
shares immediately prior to the conversion, and (iii) Class A shares received 
on conversion will have a holding period that includes the holding period of 
the converted Class B shares. The conversion feature may be suspended if the 
ruling or opinion is no longer available. In such event, Class B shares would 
continue to be subject to Class B 12b-1 fees. 

LEVEL LOAD ALTERNATIVE--CLASS C SHARES 

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

NO LOAD ALTERNATIVE--CLASS D SHARES 

Class D shares are offered without any sales charge on purchase or redemption 
and without any 12b-1 fee. Class D shares are offered only to investors 
meeting an initial investment minimum of $5 million ($25 million for 
Qualified Retirement Plans for which MSDW Trust serves as Trustee or DWR's 
Retirement Plan Services serves as recordkeeper pursuant to a written 
Recordkeeping Services Agreement) and the following categories of investors: 
(i) investors participating in the InterCapital mutual fund asset allocation 
program pursuant to which such 

16

<PAGE>

persons pay an asset based fee; (ii) persons participating in a fee-based 
program approved by the Distributor, pursuant to which such persons pay an 
asset based fee for services in the nature of investment advisory, 
administrative and/or brokerage services (subject to all of the terms and 
conditions of such programs referred to in (i) and (ii) above, which may 
include termination fees, mandatory redemption upon termination and such 
other circumstances as specified in the programs' agreements, and 
restrictions on transferability of Fund shares); (iii) 401(k) plans 
established by DWR and SPS Transaction Services, Inc. (an affiliate of DWR) 
for their employees; (iv) certain Unit Investment Trusts sponsored by DWR; 
(v) certain other open-end investment companies whose shares are distributed 
by the Distributor; and (vi) other categories of investors, at the discretion 
of the Board, as disclosed in the then current prospectus of the Fund. 
Investors who require a $5 million (or $25 million) minimum initial 
investment to qualify to purchase Class D shares may satisfy that requirement 
by investing that amount in a single transaction in Class D shares of the 
Fund and other Dean Witter Multi-Class Funds, subject to the $1,000 minimum 
initial investment required for that Class of the Fund. In addition, for the 
purpose of meeting the $5 million (or $25 million) minimum investment amount, 
holdings of Class A shares in all Dean Witter Multi-Class Funds, shares of 
FSC Funds and shares of Dean Witter Funds for which such shares have been 
exchanged, will be included together with the current investment amount. If a 
shareholder redeems Class A shares and purchases Class D shares, such 
redemption may be a taxable event. 

PLAN OF DISTRIBUTION 

The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the 
Act with respect to the distribution of Class A, Class B and Class C shares 
of the Fund. In the case of Class A and Class C shares, the Plan provides 
that the Fund will reimburse the Distributor and others for the expenses of 
certain activities and services incurred by them specifically on behalf of 
those shares. Reimbursements for these expenses will be made in monthly 
payments by the Fund to the Distributor, which will in no event exceed 
amounts equal to payments at the annual rates of 0.25% and 1.0% of the 
average daily net assets of Class A and Class C, respectively. In the case of 
Class B shares, the Plan provides that the Fund will pay the Distributor a 
fee, which is accrued daily and paid monthly, at the annual rate of 1.0% of 
the average daily net assets of Class B. The fee is treated by the Fund as an 
expense in the year it is accrued. In the case of Class A shares, the entire 
amount of the fee currently represents a service fee within the meaning of 
the NASD guidelines. In the case of Class B and Class C shares, a portion of 
the fee payable pursuant to the Plan, equal to 0.25% of the average daily net 
assets of each of these Classes, is currently characterized as a service fee. 
A service fee is a payment made for personal service and/or the maintenance 
of shareholder accounts. 

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

   For the fiscal period September 26, 1997 (commencement of operations) 
through February 28, 1998, Class A, Class B and Class C shares of the Fund 
accrued payments under the Plan amounting to $12,848, $1,127,620, and 
$75,709, respectively, which amounts on an annualized basis are equal to 
0.24%, 1.0% and 1.0% of the average daily net assets of Class A, Class B and 
Class C, respectively, for such period. 

   In the case of Class B shares, at any given time, the expenses in 
distributing Class B shares of the Fund may be in excess of the total of (i) 
the payments made by the Fund pursuant to the Plan, and (ii) the proceeds of 
CDSCs paid by investors upon the redemption of Class B shares. For example, 
if $1 million in expenses in distributing Class B shares of the Fund had been 
incurred and $750,000 had been received as described in (i) and (ii) above, 
the excess expense would amount to $250,000. The Distributor has advised the 
Fund that such excess amounts, including the carrying charge described above, 
totalled $15,470,964 at February 28, 1998, which was equal to 4.07% of the 
net assets of Class B on such date. Because there is no requirement under the 
Plan that the Distributor be reimbursed for all distribution expenses or any 
requirement that the Plan be continued from year to year, this excess amount 
does not constitute a liability of the Fund. Although there is no legal 
obligation for the Fund to pay expenses incurred in excess of payments made 
to the Distributor under the Plan, and the proceeds 

                                                                             17
<PAGE>

of CDSCs paid by investors upon redemption of shares, if for any reason the 
Plan is terminated the Trustees will consider at that time the manner in 
which to treat such expenses. Any cumulative expenses incurred, but not yet 
recovered through distribution fees or CDSCs, may or may not be recovered 
through future distribution fees or CDSCs. 

   In the case of Class A and Class C shares, expenses incurred pursuant to 
the Plan in any calendar year in excess of 0.25% or 1.0% of the average daily 
net assets of Class A or Class C, respectively, will not be reimbursed by the 
Fund through payments in any subsequent year, except that expenses 
representing a gross sales commission credited to account executives at the 
time of sale may be reimbursed in the subsequent calendar year. The 
Distributor has advised the Fund that unreimbursed expenses representing a 
gross sales commission credited to account executives at the time of sale 
totalled $145,457 in the case of Class C at December 31, 1997, which amount 
was equal to 0.76% of the net assets of Class C on such date, and that there 
were no such expenses that may be reimbursed in the subsequent year in the 
case of Class A on such date. No interest or other financing charges will be 
incurred on any Class A or Class C distribution expenses incurred by the 
Distributor under the Plan or on any unreimbursed expenses due to the 
Distributor pursuant to the Plan. 

DETERMINATION OF NET ASSET VALUE 

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

   In the calculation of the Fund's net asset value: (1) an equity portfolio 
security listed or traded on the New York or American Stock Exchange or other 
stock exchange is valued at its latest sale price on that exchange prior to 
the time assets are valued; if there were no sales that day, the security is 
valued at the latest bid price (in cases where a security is traded on more 
than one exchange, the security is valued on the exchange designated as the 
primary market pursuant to procedures adopted by the Trustees); (2) all other 
portfolio securities for which over-the-counter market quotations are readily 
available are valued at the latest bid price; (3) when market quotations are 
not readily available, including circumstances under which it is determined 
by the Investment Manager that sale or bid prices are not reflective of a 
security's market value, portfolio securities are valued at their fair value 
as determined in good faith under procedures established by and under the 
general supervision of the Fund's Trustees (valuation of debt securities for 
which market quotations are not readily available may be based upon current 
market prices of securities which are comparable in coupon, rating and 
maturity or an appropriate matrix utilizing similar factors); (4) the value 
of short-term debt securities which mature at a date less than sixty days 
subsequent to valuation date will be determined on an amortized cost or 
amortized value basis; and (5) the value of other assets will be determined 
in good faith at fair value under procedures established by and under the 
general supervision of the Fund's Trustees. Dividends receivable are accrued 
as of the ex-dividend date. Interest income is accrued daily. Certain 
securities in the Fund's portfolio may be valued by an outside pricing 
service approved by the Fund's Trustees. 

SHAREHOLDER SERVICES 
- ----------------------------------------------------------------------------- 

AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS. All income dividends and 
capital gains distributions are automatically paid in full and fractional 
shares of the applicable Class of the Fund (or, if specified by the 
shareholder, in shares of any other open-end Dean Witter Fund), unless the 
shareholder requests that they be paid in cash. Shares so acquired are 
acquired at net asset value and are not subject to the imposition of a 
front-end sales charge or a CDSC (see "Redemptions and Repurchases"). 

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

EASYINVEST (SERVICE MARK) . Shareholders may subscribe to EasyInvest, an 
automatic purchase plan which provides for any amount from $100 to $5,000 to 
be transferred automati- 

18

<PAGE>

cally from a checking or savings account or following redemption of shares of 
a Dean Witter money market fund, on a semi-monthly, monthly or quarterly 
basis, to the Transfer Agent for investment in shares of the Fund (see 
"Purchase of Fund Shares" and "Redemptions and Repurchases--Involuntary 
Redemption"). 

SYSTEMATIC WITHDRAWAL PLAN. A systematic withdrawal plan (the "Withdrawal 
Plan") is available for shareholders who own or purchase shares of the Fund 
having a minimum value of $10,000 based upon the then current net asset 
value. The Withdrawal Plan provides for monthly or quarterly (March, June, 
September and December) checks in any amount, not less than $25, or in any 
whole percentage of the account balance, on an annualized basis. Any 
applicable CDSC will be imposed on shares redeemed under the Withdrawal Plan 
(see "Purchase of Fund Shares"). Therefore, any shareholder participating in 
the Withdrawal Plan will have sufficient shares redeemed from his or her 
account so that the proceeds (net of any applicable CDSC) to the shareholder 
will be the designated monthly or quarterly amount. Withdrawal plan payments 
should not be considered as dividends, yields or income. If periodic 
withdrawal plan payments continuously exceed net investment income and net 
capital gains, the shareholder's original investment will be correspondingly 
reduced and ultimately exhausted. Each withdrawal constitutes a redemption of 
shares and any gain or loss realized must be recognized for federal income 
tax purposes. 

   Shareholders should contact their DWR or other Selected Broker-Dealer 
account executive or the Transfer Agent for further information about any of 
the above services. 

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

   For further information regarding plan administration, custodial fees and 
other details, investors should contact their DWR or other Selected 
Broker-Dealer account executive or the Transfer Agent. 

EXCHANGE PRIVILEGE 

Shares of each Class may be exchanged for shares of the same Class of any 
other Dean Witter Multi-Class Fund without the imposition of any exchange 
fee. Shares may also be exchanged for shares of the following funds: Dean 
Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal 
Trust, Dean Witter Short-Term Bond Fund, Dean Witter Intermediate Term U.S. 
Treasury Trust and five Dean Witter funds which are money market funds (the 
"Exchange Funds"). Class A shares may also be exchanged for shares of Dean 
Witter Multi-State Municipal Series Trust and Dean Witter Hawaii Municipal 
Trust, which are Dean Witter Funds sold with a front-end sales charge ("FSC 
Funds"). Class B shares may also be exchanged for shares of Dean Witter 
Global Short-Term Income Fund Inc. ("Global Short-Term") which is a Dean 
Witter Fund offered with a CDSC. Exchanges may be made after the shares of 
the Fund acquired by purchase (not by exchange or dividend reinvestment) have 
been held for thirty days. There is no waiting period for exchanges of shares 
acquired by exchange or dividend reinvestment. 

   An exchange to another Dean Witter Multi-Class Fund, any FSC Fund, Global 
Short-Term or any Exchange Fund that is not a money market fund is on the 
basis of the next calculated net asset value per share of each fund after the 
exchange order is received. When exchanging into a money market fund from the 
Fund, shares of the Fund are redeemed out of the Fund at their next 
calculated net asset value and the proceeds of the redemption are used to 
purchase shares of the money market fund at their net asset value determined 
the following day. Subsequent exchanges between any of the money market funds 
and any of the Dean Witter Multi-Class Funds, FSC Funds, Global Short-Term or 
any Exchange Fund that is not a money market fund can be effected on the same 
basis. 

   No CDSC is imposed at the time of any exchange of shares, although any 
applicable CDSC will be imposed upon ultimate redemption. During the period 
of time the shareholder remains invested in an Exchange Fund (calculated from 
the last day of the month in which the Exchange Fund shares were acquired) 
the holding period (for the purpose of determining the rate of the CDSC) is 
frozen. If those shares are subsequently re-exchanged for shares of a Dean 
Witter Multi-Class Fund or shares of Global Short-Term, the holding period 
previously frozen when the first exchange was made resumes on the last day of 
the month in which shares of a Dean Witter Multi-Class Fund or shares of 
Global Short-Term are reacquired. Thus, the CDSC is based upon the time 
(calculated as described above) the shareholder was invested in shares of a 
Dean Witter Multi-Class Fund or in shares of Global Short-Term (see "Purchase 
of Fund Shares"). In the case of exchanges of Class A shares which are 
subject to a CDSC, the holding period also includes the time (calculated as 
described above) the shareholder was invested in shares of a FSC Fund. In the 
case of shares exchanged into an Exchange Fund on or after April 23, 1990, 
upon a redemption of 

                                                                             19
<PAGE>

shares which results in a CDSC being imposed, a credit (not to exceed the 
amount of the CDSC) will be given in an amount equal to the Exchange Fund 
12b-1 distribution fees, if any, incurred on or after that date which are 
attributable to those shares. (Exchange Fund 12b-1 distribution fees are 
described in the prospectuses for those funds.) Class B shares of the Fund 
acquired in exchange for shares of Global Short-Term or Class B shares of 
another Dean Witter Multi-Class Fund having a different CDSC schedule than 
that of this Fund will be subject to the higher CDSC schedule, even if such 
shares are subsequently re-exchanged for shares of the fund with the lower 
CDSC schedule. 

ADDITIONAL INFORMATION REGARDING EXCHANGES. Purchases and exchanges should be 
made for investment purposes only. A pattern of frequent exchanges may be 
deemed by the Investment Manager to be abusive and contrary to the best 
interests of the Fund's other shareholders and, at the Investment Manager's 
discretion, may be limited by the Fund's refusal to accept additional 
purchases and/or exchanges from the investor. Although the Fund does not have 
any specific definition of what constitutes a pattern of frequent exchanges, 
and will consider all relevant factors in determining whether a particular 
situation is abusive and contrary to the best interests of the Fund and its 
other shareholders, investors should be aware that the Fund and each of the 
other Dean Witter Funds may in their discretion limit or otherwise restrict 
the number of times this Exchange Privilege may be exercised by any investor. 
Any such restriction will be made by the Fund on a prospective basis only, 
upon notice to the shareholder not later than ten days following such 
shareholder's most recent exchange. Also, the Exchange Privilege may be 
terminated or revised at any time by the Fund and/or any of such Dean Witter 
Funds for which shares of the Fund have been exchanged, upon such notice as 
may be required by applicable regulatory agencies. Shareholders maintaining 
margin accounts with DWR or another Selected Broker-Dealer are referred to 
their account executive regarding restrictions on exchange of shares of the 
Fund pledged in the margin account. 

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

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

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

   Telephone exchange instructions will be accepted if received by the 
Transfer Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the 
New York Stock Exchange is open. Any shareholder wishing to make an exchange 
who has previously filed an Exchange Privilege Authorization Form and who is 
unable to reach the Fund by telephone should contact his or her DWR or other 
Selected Broker-Dealer account executive, if appropriate, or make a written 
exchange request. Shareholders are advised that during periods of drastic 
economic or market changes, it is possible that the telephone exchange 
procedures may be difficult to implement, although this has not been the 
experience of the other Dean Witter Funds in the past. 

   For further information regarding the Exchange Privilege, shareholders 
should contact their account executive or the Transfer Agent. 

20

<PAGE>

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

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

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

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

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

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

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

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

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

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

                                                                             21
<PAGE>

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

TAXES. Because the Fund intends to distribute all of its net investment income 
and net short-term capital gains to shareholders and otherwise remain 
qualified as a regulated investment company under Subchapter M of the 
Internal Revenue Code, it is not expected that the Fund will be required to 
pay any federal income tax. Shareholders who are required to pay taxes on 
their income will normally have to pay federal income taxes, and any state 
income taxes, on the dividends and distributions they receive from the Fund. 
Such dividends and distributions, to the extent that they are derived from 
net investment income or short-term capital gains, are taxable to the 
shareholder as ordinary dividend income regardless of whether the shareholder 
receives such distributions in additional shares or in cash. Any dividends 
declared in the last quarter of any calendar year which are paid in the 
following year prior to February 1 will be deemed, for tax purposes, to have 
been received by the shareholder in the prior year. 

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

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

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

   Shareholders should consult their tax advisers as to the applicability of 
the foregoing to their current situation. 

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

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

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

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

VOTING RIGHTS. All shares of beneficial interest of the Fund are of $0.01 par 
value and are equal as to earnings, assets and voting privileges except that 
each Class will have exclusive voting privileges with respect to matters 
relating to distribution expenses borne solely by such Class or any other 
matter in which the interests of one Class differ from the interests of any 
other Class. In addition, Class B shareholders will have the right to vote 

22

<PAGE>

on any proposed material increase in Class A's expenses, if such proposal is 
submitted separately to Class A shareholders. Also, as discussed herein, 
Class A, Class B and Class C bear the expenses related to the distribution of 
their respective shares. 

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

   Under Massachusetts law, shareholders of a business trust may, under 
certain limited circumstances, be held personally liable as partners for the 
obligations of the Fund. However, the Declaration of Trust contains an 
express disclaimer of shareholder liability for acts or obligations of the 
Fund, requires that notice of such Fund obligations include such disclaimer, 
and provides for indemnification out of the Fund's property for any 
shareholder held personally liable for the obligations of the Fund. Thus, the 
risk of a shareholder incurring financial loss on account of shareholder 
liability is limited to circumstances in which the Fund itself would be 
unable to meet its obligations. Given the above limitations on shareholder 
personal liability, and the nature of the Fund's assets and operations, the 
possibility of the Fund being unable to meet its obligations is remote and 
thus, in the opinion of Massachusetts counsel to the Fund, the risk to Fund 
shareholders of personal liability is remote. 

CODE OF ETHICS. Directors, officers and employees of InterCapital, Dean 
Witter Services Company Inc. and the Distributor are subject to a strict Code 
of Ethics adopted by those companies. The Code of Ethics is intended to 
ensure that the interests of shareholders and other clients are placed ahead 
of any personal interest, that no undue personal benefit is obtained from a 
person's employment activities and that actual and potential conflicts of 
interest are avoided. To achieve these goals and comply with regulatory 
requirements, the Code of Ethics requires, among other things, that personal 
securities transactions by employees of the companies be subject to an 
advance clearance process to monitor that no Dean Witter Fund is engaged at 
the same time in a purchase or sale of the same security. The Code of Ethics 
bans the purchase of securities in an initial public offering, and also 
prohibits engaging in futures and options transactions and profiting on 
short-term trading (that is, a purchase within sixty days of a sale or a sale 
within sixty days of a purchase) of a security. In addition, investment 
personnel may not purchase or sell a security for their personal account 
within thirty days before or after any transaction in any Dean Witter Fund 
managed by them. Any violations of the Code of Ethics are subject to 
sanctions, including reprimand, demotion or suspension or termination of 
employment. The Code of Ethics comports with regulatory requirements and the 
recommendations in the 1994 report by the Investment Company Institute 
Advisory Group on Personal Investing. 

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

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

                                                                             23
<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
PORTFOLIO OF INVESTMENTS February 28, 1998 (unaudited) 

<TABLE>
<CAPTION>
 NUMBER OF 
   SHARES                                                                          VALUE 
- -------------------------------------------------------------------------------------------
<S>          <C>                                                                <C>
             COMMON STOCKS (98.2%) 
             Advertising/Marketing Services (0.3%) 
    8,466    Cognizant Corp.  ................................................  $   422,771 
             Interpublic Group of 
    6,575    Companies, Inc.  ................................................      358,337 
    8,460    Omnicom Group, Inc.  ............................................      387,045 
                                                                                -----------
                                                                                  1,168,153 
                                                                                -----------
             Aerospace & Defense (1.2%) 
   52,223    Boeing Co.  .....................................................    2,833,098 
    3,265    General Dynamics Corp.  .........................................      283,239 
   10,127    Lockheed Martin Corp.  ..........................................    1,181,694 
    3,481    Northrop Grumman Corp.  .........................................      483,859 
                                                                                -----------
                                                                                  4,781,890 
                                                                                -----------
             Agriculture Related (0.2%) 
   29,108    Archer-Daniels-Midland Co.  .....................................      653,111 
             Pioneer Hi-Bred International, 
    3,433    Inc.  ...........................................................      356,174 
                                                                                -----------
                                                                                  1,009,285 
                                                                                -----------
             Air Freight (0.1%) 
    7,626    Federal Express Corp.  ..........................................      485,681 
                                                                                -----------
             Airlines (0.4%) 
    4,790    AMR Corp.*  .....................................................      606,234 
    3,840    Delta Air Lines, Inc.  ..........................................      434,160 
   11,426    Southwest Airlines Co.  .........................................      327,783 
    4,739    US Airways Group Inc.*  .........................................      300,038 
                                                                                -----------
                                                                                  1,668,215 
                                                                                -----------
             Aluminum (0.3%) 
   11,845    Alcan Aluminium Ltd. (Canada)  ..................................      367,935 
    9,006    Aluminum Co. of America  ........................................      660,815 
    3,849    Reynolds Metals Co.  ............................................      239,841 
                                                                                -----------
                                                                                  1,268,591 
                                                                                -----------
             Auto Parts - After Market (0.5%) 
    4,108    Cooper Tire & Rubber Co.  .......................................       94,741 
    5,454    Dana Corp.  .....................................................      297,584 
    3,288    Echlin, Inc.  ...................................................      166,249 
    9,330    Genuine Parts Co.  ..............................................      345,210 
    8,142    Goodyear Tire & Rubber Co.  .....................................      562,816 
    6,179    ITT Industries, Inc.  ...........................................      211,631 
    6,427    TRW, Inc.  ......................................................      352,280 
                                                                                -----------
                                                                                  2,030,511 
                                                                                -----------
             Automobiles (1.7%) 
   34,588    Chrysler Corp.  .................................................    1,346,770 
   62,651    Ford Motor Co.  .................................................    3,543,697 
   36,926    General Motors Corp.  ...........................................    2,545,586 
                                                                                ----------- 
                                                                                  7,436,053 
                                                                                ----------- 
             Banks - Money Center (3.8%) 
   36,206    BankAmerica Corp.  ..............................................    2,805,965 
    5,115    Bankers Trust New York Corp.  ...................................      604,849 
   22,004    Chase Manhattan Corp.  ..........................................    2,729,871 
   23,887    Citicorp  .......................................................    3,165,027 
   15,188    First Chicago NBD Corp.  ........................................    1,248,264 
   32,760    First Union Corp.  ..............................................    1,726,042 
    9,275    Morgan (J.P.) & Co., Inc.  ......................................    1,108,362 
   49,094    NationsBank Corp.  ..............................................    3,362,939 
                                                                                ----------- 
                                                                                 16,751,319 
                                                                                ----------- 
             Banks - Regional (4.6%) 
   33,709    Banc One Corp.  .................................................    1,904,558 
   19,665    Bank of New York Co., Inc.  .....................................    1,151,632 
    7,598    BankBoston Corp.  ...............................................      757,426 
    7,143    BB&T Corporation  ...............................................      443,312 
    2,864    Cincinnati Financial Corp.  .....................................      386,282 
    5,502    Comerica, Inc.  .................................................      554,670 
   10,328    CoreStates Financial Corp.  .....................................      872,070 
    8,041    Fifth Third Bancorp  ............................................      633,229 
   14,225    Fleet Financial Group, Inc.  ....................................    1,121,108 
    9,971    Huntington Bancshares, Inc.  ....................................      357,710 
   11,469    KeyCorp  ........................................................      803,547 
   13,292    Mellon Bank Corp.  ..............................................      828,258 
    6,801    Mercantile Bancorporation, Inc.  ................................      378,306 
   11,157    National City Corp.  ............................................      727,994 
    5,828    Northern Trust Corp.  ...........................................      441,471 
   39,434    Norwest Corp.  ..................................................    1,614,329 
   15,926    PNC Bank Corp.  .................................................  $   883,893 
    2,858    Republic New York Corp.  ........................................      345,818 
    8,381    State Street Corp.  .............................................      518,051 
    9,187    Summit Bancorp  .................................................      456,479 
   11,009    SunTrust Banks, Inc.  ...........................................      811,914 
    9,128    Synovus Financial Corp.  ........................................      320,621 
   12,818    U.S. Bancorp  ...................................................    1,474,871 
   10,650    Wachovia Corp.  .................................................      846,675 
    4,527    Wells Fargo & Co.  ..............................................    1,457,694 
                                                                                ----------- 
                                                                                 20,091,918 
                                                                                ----------- 
             Beverages - Alcoholic (0.5%) 
   25,579    Anheuser-Busch Companies, Inc.  .................................    1,199,016 
    3,601    Brown-Forman Corp. (Class B)  ...................................      199,855 
    1,933    Coors (Adolph) Co. (Class B)  ...................................       60,406 
   18,610    Seagram Co. Ltd. (Canada)  ......................................      707,180 
                                                                                ----------- 
                                                                                  2,166,457 
                                                                                ----------- 
             Beverages - Soft Drinks (2.7%) 
   129,126   Coca Cola Co.**  ................................................    8,869,342  
    79,206   PepsiCo, Inc.  ..................................................    2,895,969 
                                                                                -----------
                                                                                 11,765,311 
                                                                                ----------- 
             Biotechnology (0.1%)                                              
    13,741   Amgen Inc.*  ....................................................      729,991 
                                                                                ----------- 
             Broadcast Media (1.0%)                                            
    36,755   CBS Corp.  ......................................................    1,137,108 
     5,116   Clear Channel Communications, Inc.*  ............................      463,637 
             Tele-Communications, Inc.                                         
    26,481   (Class A)*  .....................................................      769,604 
    31,693   U.S. West Media Group, Inc.*  ...................................    1,020,118 
    18,418   Viacom, Inc. (Class B)*  ........................................      884,064 
                                                                                ----------- 
                                                                                  4,274,531 
                                                                                ----------- 
             Building Materials (0.2%)                                         
             Armstrong World Industries                                        
     2,126   Inc.  ...........................................................      166,891 
     8,610   Masco Corp.  ....................................................      468,169 
     2,785   Owens-Corning  ..................................................       85,987 
                                                                                ----------- 
                                                                                    721,047 
                                                                                ----------- 
             Chemicals (1.7%)                                                  
     5,720   Air Products & Chemicals, Inc.  .................................      480,122 
    11,839   Dow Chemical Co.  ...............................................    1,083,268 
    59,079   DuPont (E.I.) de Nemours & Co., Inc.  ...........................    3,622,281 
     4,087   Eastman Chemical Co.  ...........................................      267,698 
     3,750   Goodrich (B.F.) Co.  ............................................      185,859 
     5,044   Hercules, Inc.  .................................................      243,688 
     9,300   PPG Industries, Inc.  ...........................................      602,756 
     8,240   Praxair, Inc.  ..................................................      393,975 
     3,209   Rohm & Haas Co.  ................................................      327,117 
     6,469   Union Carbide Corp.  ............................................      300,404 
                                                                                ----------- 
                                                                                  7,507,168 
                                                                                ----------- 
             Chemicals - Diversified (0.4%)                                     
     7,533   Engelhard Corp.  ................................................      136,536 
     1,936   FMC Corp.*  .....................................................      140,118 
    30,959   Monsanto Co.  ...................................................    1,575,039 
                                                                                ----------- 
                                                                                  1,851,693 
                                                                                ----------- 
             Chemicals - Specialty (0.3%)                                       
     3,876   Grace (W. R.) & Co.  ............................................      325,342 
     3,123   Great Lakes Chemical Corp.  .....................................      151,856 
                                                                              
                             SEE NOTES TO FINANCIAL STATEMENTS

24

<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
PORTFOLIO OF INVESTMENTS February 28, 1998 (unaudited) continued 

 NUMBER OF 
   SHARES                                                                          VALUE 
- -------------------------------------------------------------------------------------------
     5,701   International Flavors & Fragrances, Inc.  .......................  $   262,246 
     6,946   Morton International, Inc.  .....................................      229,652 
     3,485   Nalco Chemical Co.  .............................................      140,271 
     5,232   Sigma-Aldrich Corp.  ............................................      206,664 
                                                                                ----------- 
                                                                                  1,316,031 
                                                                                ----------- 
             Commercial & Consumer 
             Services (0.7%) 
     5,432   Block (H.&R.), Inc.  ............................................      255,643 
    41,270   Cendant Corp.*  .................................................    1,547,625 
     8,893   Dun & Bradstreet Corp.  .........................................      297,915 
    17,150   Laidlaw, Inc. (Canada)  .........................................      251,891 
    13,128   Service Corp. International  ....................................      497,223 
                                                                                ----------- 
                                                                                  2,850,297 
                                                                                ----------- 
             Communications Equipment (1.0%) 
     4,706   Andrew Corp.*  ..................................................      130,003 
     4,158   Harris Corp.  ...................................................      210,759 
    31,166   Motorola, Inc.  .................................................    1,737,504 
    27,358   Northern Telecom Ltd. (Canada)  .................................    1,458,523 
     4,058   Scientific-Atlanta, Inc.  .......................................       71,015 
     9,452   Tellabs, Inc.*  .................................................      570,664 
                                                                                ----------- 
                                                                                  4,178,468 
                                                                                ----------- 
             Computer - Networking (1.0%) 
    18,062   3Com Corp.*  ....................................................      645,716 
    11,047   Bay Networks, Inc.*  ............................................      374,217 
     8,229   Cabletron Systems, Inc.*  .......................................      127,549 
    52,531   Cisco Systems, Inc.*  ...........................................    3,460,480 
                                                                                ----------- 
                                                                                  4,607,962 
                                                                                ----------- 
             Computer Software & Services (3.5%) 
     3,804   Adobe Systems, Inc.  ............................................      168,089 
     2,504   Autodesk, Inc.  .................................................      118,627 
    28,543   Computer Associates International, Inc.  ........................    1,345,089 
     4,032   Computer Sciences Corp.*  .......................................      422,100 
    11,033   HBO & Co.  ......................................................      597,161 
   126,001   Microsoft Corp.*_**  ............................................   10,678,585 
    18,218   Novell, Inc.*  ..................................................      191,289 
    51,192   Oracle Corp.*  ..................................................    1,260,603 
     6,648   Parametric Technology Corp.*  ...................................      402,204 
     1,300   Shared Medical Systems Corp.  ...................................       99,369 
                                                                                ----------- 
                                                                                 15,283,116 
                                                                                ----------- 
             Computers - Peripheral 
             Equipment (0.3%) 
    25,893   EMC Corp.*  .....................................................      990,407 
    12,760   Seagate Technology, Inc.*  ......................................      310,227 
                                                                                ----------- 
                                                                                  1,300,634 
                                                                                ----------- 
             Computers - Systems (2.7%) 
     6,644   Apple Computer, Inc.*  ..........................................      156,964 
    79,046   COMPAQ Computer Corp.  ..........................................    2,534,412 
     2,495   Data General Corp.*  ............................................       51,459 
    17,043   Dell Computer Corp.*  ...........................................    2,382,824 
     7,717   Digital Equipment Corp.*  .......................................      439,387 
    50,757   International Business Machines Corp.**  ........................    5,300,934 
    19,559   Sun Microsystems, Inc.*  ........................................      931,497 
                                                                                ----------- 
                                                                                 11,797,477 
                                                                                ----------- 
             Consumer - Noncyclical (0.0%) 
             American Greetings Corp. 
     3,843   (Class A)  ......................................................      175,337 
     2,040   Jostens, Inc.  ..................................................       47,940 
                                                                                ----------- 
                                                                                    223,277 
                                                                                ----------- 
             Containers - Metal & Glass (0.1%) 
     1,574   Ball Corp.  .....................................................       51,352 
     6,696   Crown Cork & Seal Co., Inc.  ....................................      361,584 
     7,322   Owens-Illinois, Inc.*  ..........................................      280,982 
                                                                                ----------- 
                                                                                    693,918 
                                                                                ----------- 
             Containers - Paper (0.1%) 
     2,767   Bemis Company, Inc.  ............................................  $   124,688 
     5,181   Stone Container Corp.  ..........................................       58,286 
     2,970   Temple-Inland, Inc.  ............................................      177,086 
     3,622   Union Camp Corp.  ...............................................      216,414 
                                                                                ----------- 
                                                                                    576,474 
                                                                                ----------- 
             Data Processing (0.5%) 
    15,275   Automatic Data Processing, Inc.  ................................      932,730 
     3,985   Ceridian Corp.*  ................................................      185,552 
     7,867   Equifax, Inc.  ..................................................      282,720 
    22,347   First Data Corp.  ...............................................      759,798 
                                                                                ----------- 
                                                                                  2,160,800 
                                                                                ----------- 
             Distributors - Food & Health (0.2%) 
     5,709   Cardinal Health, Inc.  ..........................................      467,424 
     3,158   Supervalu, Inc.  ................................................      150,400 
     8,930   Sysco Corp.  ....................................................      420,268 
                                                                                ----------- 
                                                                                  1,038,092 
                                                                                ----------- 
             Electrical Equipment (3.9%)
    11,465   AMP, Inc.  ......................................................      506,610 
    23,138   Emerson Electric Co.  ...........................................    1,476,494 
   170,868   General Electric Co.**  .........................................   13,284,987  
     2,619   General Signal Corp.  ...........................................      106,397 
     6,651   Honeywell, Inc.  ................................................      527,092 
     4,489   Raychem Corp.  ..................................................      194,991 
    10,896   Rockwell International Corp.  ...................................      659,208 
     2,868   Thomas & Betts Corp.  ...........................................      162,580 
                                                                                ----------- 
                                                                                 16,918,359 
                                                                                ----------- 
             Electronic Components (0.0%)                                      
     2,593   Grainger (W.W.), Inc.  ..........................................      251,035 
     9,775   Silicon Graphics, Inc.*  ........................................      147,236 
                                                                                ----------- 
                                                                                    398,271 
                                                                                ----------- 
             Electronics - Defense (0.2%)                                       
    17,694   Raytheon Co. (Class B)  .........................................    1,040,628 
                                                                                ----------- 
             Electronics - Instrumentation (0.9%)                               
     2,382   EG & G, Inc.  ...................................................       64,165 
    54,273   Hewlett-Packard Co.  ............................................    3,636,291 
     2,509   Perkin-Elmer Corp.  .............................................      183,627 
     2,618   Tektronix, Inc.  ................................................      116,828 
                                                                                ----------- 
                                                                                  4,000,911 
                                                                                ----------- 
             Electronics - Semiconductors (2.2%)                                
     7,361   Advanced Micro Devices, Inc.*  ..................................      172,523 
    85,413   Intel Corp.**  ..................................................    7,655,140 
     7,402   LSI Logic Corp.*  ...............................................      175,335 
    10,999   Micron Technology, Inc.*  .......................................      365,029 
     8,523   National Semiconductor Corp.*  ..................................      203,487 
    20,374   Texas Instruments, Inc.  ........................................    1,179,145 
                                                                                ----------- 
                                                                                  9,750,659 
                                                                                ----------- 
             Engineering & Construction (0.0%)                                 
     4,378   Fluor Corp.  ....................................................      206,040 
     2,122   Foster Wheeler Corp.  ...........................................       56,763 
     2,902   McDermott International, Inc.  ..................................      114,266 
                                                                                ----------- 
                                                                                    377,069 
                                                                                ----------- 
             Entertainment (0.9%)                                              
     3,836   King World Productions Inc.*  ...................................      102,373 
    35,226   Walt Disney Co.  ................................................    3,943,110 
                                                                                ----------- 
                                                                                  4,045,483 
                                                                                ----------- 
             Facilities & Environmental                                        
             Services (0.0%)                                                   
     3,043   Safety-Kleen Corp.  .............................................       81,590 
                                                                                ----------- 
             Finance - Consumer (0.6%)                                          
     2,773   Beneficial Corp.  ...............................................      327,214 
     5,635   Countrywide Credit Industries, Inc.  ............................      250,405 
     7,090   Green Tree Financial Corp.  .....................................      162,627 
                                                                              
                             SEE NOTES TO FINANCIAL STATEMENTS

                                                                                         25
<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
PORTFOLIO OF INVESTMENTS February 28, 1998 (unaudited) continued 

 NUMBER OF 
   SHARES                                                                          VALUE 
- -------------------------------------------------------------------------------------------
    5,575    Household International, Inc.  ..................................  $   724,053 
   26,149    MBNA Corp.  .....................................................      936,461 
    4,967    Providian Financial Corp.  ......................................      281,877 
                                                                                ----------- 
                                                                                  2,682,637 
                                                                                ----------- 
             Finance - Diversified (2.8%) 
   24,265    American Express Co.  ...........................................    2,185,367 
   12,718    American General Corp.  .........................................      739,234 
   55,357    Fannie Mae  .....................................................    3,532,469 
   36,260    Freddie Mac  ....................................................    1,713,285 
             Hartford Financial Services 
    6,155    Group Inc.  .....................................................      604,729 
    5,320    Lehman Brothers Holdings, Inc.  .................................      335,492 
    5,957    MGIC Investment Corp.  ..........................................      438,956 
   30,930    Morgan Stanley, Dean Witter, Discover & Co. (Note 4)  ...........    2,155,434 
   10,178    SunAmerica, Inc.  ...............................................      461,191 
                                                                                ----------- 
                                                                                 12,166,157 
                                                                                ----------- 
             Foods (2.0%) 
    7,495    Bestfoods  ......................................................      789,786 
   23,888    Campbell Soup Co.  ..............................................    1,386,997 
   24,664    ConAgra, Inc.  ..................................................      739,920 
    8,262    General Mills, Inc.  ............................................      594,348 
   19,171    Heinz (H.J.) Co.  ...............................................    1,079,567 
    7,453    Hershey Foods Corp.  ............................................      497,022 
   21,454    Kellogg Co.  ....................................................      914,477 
    7,230    Quaker Oats Company (The)  ......................................      389,516 
    5,560    Ralston-Ralston Purina Group  ...................................      563,992 
   25,057    Sara Lee Corp.  .................................................    1,415,720 
    6,063    Wrigley (WM.) Jr. Co. (Class A)  ................................      463,062 
                                                                                ----------- 
                                                                                  8,834,407 
                                                                                ----------- 
             Footwear (0.2%) 
   15,164    Nike, Inc. (Class B)  ...........................................      665,320 
    2,934    Reebok International Ltd. (United Kingdom)  .....................       91,504 
                                                                                ----------- 
                                                                                    756,824 
                                                                                ----------- 
             Gaming, Lottery, & Pari-mutuel Companies (0.0%) 
    5,266    Harrah's Entertainment, Inc.*  ..................................      110,915 
    9,335    Mirage Resorts, Inc.*  ..........................................      213,538 
                                                                                ----------- 
                                                                                    324,453 
                                                                                ----------- 
             Gold & Precious Metals Mining (0.2%) 
   19,447    Barrick Gold Corp. (Canada)  ....................................      375,570 
   11,986    Battle Mountain Gold Co.  .......................................       71,916 
    7,655    Homestake Mining Co.  ...........................................       76,550 
    8,156    Newmont Mining Corp.  ...........................................      236,014 
   12,497    Placer Dome Inc. (Canada)  ......................................      160,899 
                                                                                ----------- 
                                                                                    920,949 
                                                                                ----------- 
             Hardware & Tools (0.1%) 
    4,930    Black & Decker Corp.  ...........................................      248,349 
    3,189    Snap-On, Inc.  ..................................................      135,532 
    4,647    Stanley Works  ..................................................      222,185 
                                                                                ----------- 
                                                                                    606,066 
                                                                                ----------- 
             Healthcare - Diversified (4.4%) 
   39,933    Abbott Laboratories  ............................................    2,987,488 
    3,387    Allergan, Inc.  .................................................      118,545 
   33,918    American Home Products Corp.  ...................................    3,179,813 
   51,910    Bristol-Myers Squibb Co.  .......................................    5,200,733 
   70,214    Johnson & Johnson  ..............................................    5,301,157 
    3,823    Mallinckrodt Group, Inc.  .......................................      148,380 
   14,218    Warner-Lambert Co.  .............................................    2,079,383 
                                                                                ----------- 
                                                                                 19,015,499 
                                                                                ----------- 
             Healthcare - Drugs (5.0%) 
   57,917    Lilly (Eli) & Co.  ..............................................    3,811,663 
   62,560    Merck & Co., Inc.**  ............................................    7,980,310 
   67,521    Pfizer, Inc.  ...................................................    5,975,609 
   26,484    Pharmacia & Upjohn, Inc.  .......................................  $ 1,047,773 
   38,222    Schering-Plough Corp.  ..........................................    2,907,261 
                                                                                ----------- 
                                                                                 21,722,616 
                                                                                ----------- 
             Healthcare - HMOs (0.2%) 
    8,543    Humana, Inc.*  ..................................................      217,313 
    9,833    United Healthcare Corp.  ........................................      596,740 
                                                                                ----------- 
                                                                                    814,053 
                                                                                ----------- 
             Healthcare - Long Term (0.2%) 
   20,551    Healthsouth Corp.*  .............................................      554,877 
    3,320    Manor Care, Inc.  ...............................................      124,708 
                                                                                ----------- 
                                                                                    679,585 
                                                                                ----------- 
             Healthcare - Specialized Services (0.0%) 
    4,439    ALZA Corp. (Class A)*  ..........................................      165,908 
                                                                                ----------- 
             Heavy Duty Trucks & Parts (0.1%) 
    1,994    Cummins Engine Co., Inc.  .......................................      115,403 
    3,932    Navistar International Corp.*  ..................................      119,435 
    4,060    PACCAR, Inc.  ...................................................      256,288 
                                                                                ----------- 
                                                                                    491,126 
                                                                                ----------- 
             Home Building (0.0%)
    1,522    Centex Corp.  ...................................................     111,201 
    1,875    Fleetwood Enterprises, Inc.  ....................................      87,891 
    2,029    Kaufman & Broad Home Corp.  .....................................      52,500 
    1,106    Pulte Corp.  ....................................................      50,323 
                                                                                ----------- 
                                                                                   301,915 
                                                                                ----------- 
             Hospital Management (0.3%) 
   33,809    Columbia/HCA Healthcare Corp.  ..................................     917,069 
   15,937    Tenet Healthcare Corp.*  ........................................     594,649 
                                                                                ----------- 
                                                                                 1,511,718 
                                                                                ----------- 
             Household Furnishings & 
             Appliances (0.1%) 
    4,958    Maytag Corp.  ...................................................      223,110 
    3,893    Whirlpool Corp.  ................................................      260,101 
                                                                                ----------- 
                                                                                    483,211 
                                                                                ----------- 
             Household Products -                                              
             Non-durable (2.7%)                                                
    5,392    Clorox Co.  .....................................................      473,148 
   15,437    Colgate-Palmolive Co.  ..........................................    1,253,291 
   10,903    Fort James Corp.  ...............................................      494,724 
   28,671    Kimberly-Clark Corp.  ...........................................    1,596,616 
   70,169    Procter & Gamble Co.  ...........................................    5,959,979 
             Unilever N.V. & PLC                                               
   33,404    (Netherlands)  ..................................................    2,148,295 
                                                                                ----------- 
                                                                                 11,926,053 
                                                                                ----------- 
             Housewares (0.2%)                                                 
    8,942    Fortune Brands, Inc.  ...........................................      354,886 
    8,302    Newell Co.  .....................................................      380,854 
    7,819    Rubbermaid, Inc.  ...............................................      226,751 
    3,193    Tupperware Corp.  ...............................................       85,812 
                                                                                ----------- 
                                                                                  1,048,303 
                                                                                ----------- 
             Insurance Brokers (0.4%)                                          
    8,729    AON Corp.  ......................................................      522,103 
    8,868    Marsh & McLennan Co., Inc.  .....................................      768,745 
    5,111    MBIA Inc.  ......................................................      374,061 
                                                                                ----------- 
                                                                                  1,664,909 
                                                                                ----------- 
             Investment Banking/Brokerage (0.4%)                               
   17,392    Merrill Lynch & Co., Inc.  ......................................    1,244,615 
   13,866    Schwab (Charles) Corp.  .........................................      523,441 
                                                                                ----------- 
                                                                                  1,768,056 
                                                                                ----------- 
             Leisure Time - Products (0.2%)                                     
    5,185    Brunswick Corp.  ................................................      164,624 
    6,619    Hasbro, Inc.  ...................................................      240,352 
   15,157    Mattel, Inc.  ...................................................      641,331 
                                                                                ----------- 
                                                                                  1,046,307 
                                                                                ----------- 
             Life & Health Insurance (0.6%)                                    
    7,757    Aetna Inc.  .....................................................      677,768 
    9,808    Conseco, Inc.  ..................................................      460,363 
    3,694    Jefferson-Pilot Corp.  ..........................................      309,834 
                                                                              
                             SEE NOTES TO FINANCIAL STATEMENTS

26

<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
PORTFOLIO OF INVESTMENTS February 28, 1998 (unaudited) continued 

 NUMBER OF 
   SHARES                                                                          VALUE 
- -------------------------------------------------------------------------------------------
    7,310    Torchmark Corp.  ................................................   $  340,372 
    3,299    Transamerica Corp.  .............................................      384,127 
    7,271    UNUM Corp.  .....................................................      374,002 
                                                                                ----------- 
                                                                                  2,546,466 
                                                                                ----------- 
             Lodging - Hotels (0.2%)                                            
   13,048    Hilton Hotels Corp.  ............................................      388,994 
    6,643    Marriot International, Inc.  ....................................      503,207 
                                                                                ----------- 
                                                                                    892,201 
                                                                                ----------- 
             Machinery - Diversified (0.8%)                                     
    3,895    Case Corp.  .....................................................      253,418 
   19,436    Caterpillar Inc.  ...............................................    1,061,692 
    2,080    Cincinnati Milacron, Inc.  ......................................       64,220 
    6,319    Cooper Industries, Inc.  ........................................      354,654 
   13,154    Deere & Co.  ....................................................      738,268 
   11,603    Dover Corp.  ....................................................      448,166 
    2,577    Harnischfeger Industries, Inc.  .................................       91,161 
    8,654    Ingersoll-Rand Co.  .............................................      412,147 
      424    NACCO Industries, Inc. (Class A) ................................       55,147 
    3,284    Timken Co.  .....................................................      105,909 
                                                                                ----------- 
                                                                                  3,584,782 
                                                                                ----------- 
             Manufacturing - Diversified (2.2%)                                 
    1,468    Aeroquip-Vickers, Inc.  .........................................       85,236 
   29,452    AlliedSignal, Inc.  .............................................    1,253,551 
   12,044    Corning, Inc.  ..................................................      489,288 
    2,394    Crane Co.  ......................................................      117,306 
    4,030    Eaton Corp.  ....................................................      387,132 
   13,014    Illinois Tool Works Inc.  .......................................      780,027 
    4,371    Johnson Controls, Inc.  .........................................      242,864 
   21,337    Minnesota Mining & Manufacturing Co.  ...........................    1,820,313 
    2,255    National Service Industries, Inc.  ..............................      125,012 
    8,883    Tenneco, Inc.  ..................................................      365,313 
    8,599    Textron Inc.  ...................................................      644,388 
    7,901    Thermo Electron Corp.*  .........................................      323,941 
   27,800    Tyco International Ltd.  ........................................    1,410,850 
   12,164    United Technologies Corp.  ......................................    1,086,397 
    9,594    UST, Inc.  ......................................................      339,987 
                                                                                ----------- 
                                                                                  9,471,605 
                                                                                ----------- 
             Manufacturing - Specialized (0.2%)                                 
    5,375    Avery Dennison Corp.  ...........................................      271,438 
    1,315    Briggs & Stratton Corp.  ........................................       58,271 
    2,273    Millipore Corp.  ................................................       85,948 
    6,641    Pall Corp.  .....................................................      139,046 
    5,825    Parker-Hannifin Corp.  ..........................................      271,591 
                                                                                ----------- 
                                                                                    826,294 
                                                                                ----------- 
             Medical Products & Supplies (1.0%)                                
    2,992    Bard (C.R.), Inc.  ..............................................      104,346 
    2,890    Bausch & Lomb, Inc.  ............................................      129,508 
   14,621    Baxter International, Inc.  .....................................      827,914 
    6,376    Becton, Dickinson & Co.  ........................................      405,673 
    5,806    Biomet, Inc.  ...................................................      173,091 
   10,135    Boston Scientific Corp.*  .......................................      605,566 
    7,732    Guidant Corp.  ..................................................      563,953 
   24,487    Medtronic, Inc.  ................................................    1,300,872 
    4,792    St. Jude Medical, Inc.*  ........................................      174,908 
    3,953    United States Surgical Corp.  ...................................      121,061 
                                                                                ----------- 
                                                                                  4,406,892 
                                                                                ----------- 
             Metals & Mining (0.1%)                                            
    2,106    ASARCO, Inc.  ...................................................       46,595 
    4,875    Cyprus Amax Minerals Co.  .......................................       79,828 
   10,098    Freeport-McMoran Copper & Gold, Inc. (Class B)  .................      152,101 
    8,711    Inco Ltd. (Canada)  .............................................      154,076 
    3,067    Phelps Dodge Corp.  .............................................      194,755 
                                                                                ----------- 
                                                                                    627,355 
                                                                                ----------- 
             Multi-line Insurance (2.2%)                                       
   36,625    American International Group, Inc.  .............................  $ 4,401,867 
    3,862    CIGNA Corp.  ....................................................      737,642 
    5,322    Lincoln National Corp.  .........................................      445,718 
    6,001    Loews Corp.  ....................................................      601,975 
   59,868    Travelers Group, Inc.  ..........................................    3,337,641 
                                                                                ----------- 
                                                                                  9,524,843 
                                                                                ----------- 
             Office Equipment & Supplies (0.2%)                                
    4,629    Moore Corp. Ltd. (Canada)  ......................................       72,617 
   15,070    Pitney Bowes, Inc.  .............................................      706,406 
    9,134    Unisys Corp.*  ..................................................      163,270 
                                                                                ----------- 
                                                                                    942,293 
                                                                                ----------- 
             Oil & Gas - Exploration &                                          
             Production (0.2%)                                                 
    8,156    Burlington Northern Santa Fe Corp.  .............................      812,542 
                                                                                ----------- 
             Oil & Gas - Refining &                                             
             Marketing (0.0%)                                                  
    3,899    Ashland, Inc.  ..................................................      217,126 
                                                                                ----------- 
             Oil & Gas Drilling (0.8%)                                         
    8,805    Baker Hughes, Inc.  .............................................      360,455 
    9,137    Dresser Industries, Inc.  .......................................      408,310 
   13,678    Halliburton Co.  ................................................      636,027 
    2,604    Helmerich & Payne, Inc.  ........................................       75,353 
    4,516    Rowan Companies, Inc.*  .........................................      127,295 
    25,828   Schlumberger Ltd.  ..............................................    1,946,786 
     2,819   Western Atlas, Inc.*  ...........................................      214,068 
                                                                                ----------- 
                                                                                  3,768,294 
                                                                                ----------- 
             Oil - Exploration & Production (0.2%)                              
     3,116   Anardarko Petroleum Corp.*  .....................................      200,982 
     4,737   Apache Corp.*  ..................................................      161,058 
     9,204   Burlington Resources, Inc.  .....................................      411,879 
     5,502   Oryx Energy Co.*  ...............................................      139,957 
                                                                                ----------- 
                                                                                    913,876 
                                                                                ----------- 
             Oil - Integrated - Domestic (1.0%)                                  
     4,787   Amerada Hess Corp.  .............................................      283,929 
    16,737   Atlantic Richfield Co.  .........................................    1,301,302 
     2,487   Kerr-McGee Corp.  ...............................................      168,183 
    17,687   Occidental Petroleum Corp.  .....................................      452,124 
     2,466   Pennzoil Co.  ...................................................      165,068 
    13,741   Phillips Petroleum Co.  .........................................      673,309 
     3,774   Sun Co., Inc.  ..................................................      150,724 
    13,241   Union Pacific Resources Group, Inc.  ............................      296,267 
    12,880   Unocal Corp.  ...................................................      485,415 
    15,032   USX-Marathon Group  .............................................      519,544 
                                                                                ----------- 
                                                                                  4,495,865 
                                                                                ----------- 
             Oil - Integrated - International (5.4%)                             
    25,423   Amoco Corp.  ....................................................    2,160,955 
    34,288   Chevron Corp.  ..................................................    2,781,614 
   128,744   Exxon Corp.**  ..................................................    8,223,523 
    40,988   Mobil Corp.  ....................................................    2,969,068 
             Royal Dutch Petroleum Co.                                         
   111,878   (ADR)(Netherlands)**  ...........................................    6,076,374 
    28,613   Texaco, Inc.  ...................................................    1,596,963 
                                                                                ----------- 
                                                                                 23,808,497 
                                                                                ----------- 
             Paper & Forest Products (0.6%)                                    
     2,907   Boise Cascade Corp.  ............................................       96,839 
     5,007   Champion International Corp.  ...................................      255,670 
     4,835   Georgia-Pacific Corp.  ..........................................      283,754 
    15,777   International Paper Co.  ........................................      735,603 
     5,704   Louisiana-Pacific Corp.  ........................................      125,132 
     5,459   Mead Corp.  .....................................................      186,630 
     1,507   Potlatch Corp.  .................................................       65,272 
     5,322   Westvaco Corp.  .................................................      172,965 
    10,406   Weyerhaeuser Co.  ...............................................      519,650 
                                                                              
                       SEE NOTES TO FINANCIAL STATEMENTS

                                                                             27
<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
PORTFOLIO OF INVESTMENTS February 28, 1998 (unaudited) continued 

 NUMBER OF 
   SHARES                                                                          VALUE 
- -------------------------------------------------------------------------------------------
    5,797    Willamette Industries, Inc.  ....................................  $   214,127 
                                                                                ----------- 
                                                                                  2,655,642 
                                                                                ----------- 
             Personal Care (0.8%)                                              
    2,929    Alberto-Culver Co. (Class B)  ...................................       89,151 
    6,903    Avon Products, Inc.  ............................................      486,230 
   29,241    Gillette Co.  ...................................................    3,154,373 
                                                                                ----------- 
                                                                                  3,729,754 
                                                                                ----------- 
             Photography/Imaging (0.6%)                                        
   16,992    Eastman Kodak Co.  ..............................................    1,115,100 
    6,931    Ikon Office Solutions, Inc.  ....................................      226,557 
    2,370    Polaroid Corp.  .................................................      108,576 
   17,016    Xerox Corp.  ....................................................    1,509,107 
                                                                                ----------- 
                                                                                  2,959,340 
                                                                                ----------- 
             Property - Casualty Insurance (1.1%)                               
   22,388    Allstate Corp.  .................................................    2,087,681 
    8,885    Chubb Corp.  ....................................................      709,134 
    4,095    General Re Corp.  ...............................................      872,235 
    3,764    Progressive Corp.  ..............................................      436,154 
    7,369    SAFECO Corp.  ...................................................      385,951 
    4,376    St. Paul Companies, Inc.  .......................................      387,823 
    5,882    USF&G Corp.  ....................................................      143,741 
                                                                                ----------- 
                                                                                  5,022,719 
                                                                                ----------- 
             Publishing (0.7%)                                                 
    5,009    Dow Jones & Co., Inc.  ..........................................      257,337 
    5,161    McGraw-Hill, Inc.  ..............................................      390,301 
    2,789    Meredith Corp.  .................................................      119,753 
   29,208    Time Warner, Inc.  ..............................................    1,971,540 
    4,618    Times Mirror Co. (Class A)  .....................................      284,296 
                                                                                ----------- 
                                                                                  3,023,227 
                                                                                ----------- 
             Publishing - Newspaper (0.4%)                                      
   14,791    Gannett Co., Inc.  ..............................................      954,944 
    4,408    Knight-Ridder Newspapers, Inc.  .................................      247,950 
    5,004    New York Times Co. (Class A)  ...................................      327,449 
    6,407    Tribune Co.  ....................................................      413,652 
                                                                                ----------- 
                                                                                  1,943,995 
                                                                                ----------- 
             Railroads (0.4%)                                                  
   11,370    CSX Corp.  ......................................................      636,009 
   19,668    Norfolk Southern Corp.  .........................................      677,317 
   12,892    Union Pacific Corp.  ............................................      657,492 
                                                                                ----------- 
                                                                                  1,970,818 
                                                                                ----------- 
             Restaurants (0.5%)                                                
    7,979    Darden Restaurants, Inc.  .......................................      107,717 
   35,895    McDonald's Corp.  ...............................................    1,965,251 
    7,923    TRICON Global Restaurants, Inc.*  ...............................      224,815 
    6,877    Wendy's International, Inc.  ....................................      149,145 
                                                                                ----------- 
                                                                                  2,446,928 
                                                                                ----------- 
             Retail - Building Supplies (0.7%)                                  
   38,194    Home Depot, Inc.  ...............................................    2,437,255 
    9,113    Lowe's Companies, Inc.  .........................................      532,541 
    9,009    Sherwin-Williams Co.  ...........................................      301,238 
                                                                                ----------- 
                                                                                  3,271,034 
                                                                                ----------- 
             Retail - Computers & Electronics (0.1%)                            
    5,142    Circuit City Stores, Inc.  ......................................      198,610 
    5,397    Tandy Corp.  ....................................................      240,167 
                                                                                ----------- 
                                                                                    438,777 
                                                                                ----------- 
             Retail - Department Stores (0.6%)                                  
    5,815    Dillard Department Stores, Inc. (Class A)  ......................      207,159 
   10,917    Federated Department Stores, Inc.*  .............................      511,734 
    3,691    Harcourt General, Inc.  .........................................      199,314 
   12,075    May Department Stores Co.  ......................................      733,556 
    1,918    Mercantile Stores Co., Inc.  ....................................      126,228 
    4,031    Nordstrom, Inc.  ................................................      230,775 
   13,049    Penney (J.C.) Co., Inc.  ........................................      922,401 
                                                                                ----------- 
                                                                                  2,931,167 
                                                                                ----------- 
             Retail - Drug Stores (0.5%)                                        
    8,977    CVS Corp.  ......................................................  $   664,859 
    2,040    Longs Drug Stores Corp.  ........................................       64,643 
   13,021    Rite Aid Corp.  .................................................      421,555 
   25,683    Walgreen Co.  ...................................................      942,245 
                                                                                ----------- 
                                                                                  2,093,302 
                                                                                ----------- 
             Retail - Food Chains (0.5%)                                        
   12,820    Albertson's, Inc.  ..............................................      600,136 
   14,214    American Stores Co.  ............................................      358,015 
    3,130    Giant Food, Inc. (Class A)  .....................................      113,658 
             Great Atlantic & Pacific Tea                                      
    1,995    Co., Inc.  ......................................................       60,723 
   13,278    Kroger Co.*  ....................................................      560,996 
    7,768    Winn-Dixie Stores, Inc.  ........................................      418,987 
                                                                                ----------- 
                                                                                  2,112,515 
                                                                                ----------- 
             Retail - General Merchandise (2.0%)                                
    5,601    Consolidated Stores Corp.*  .....................................      230,341 
   11,089    Costco Companies, Inc.*  ........................................      541,975 
   11,359    Dayton-Hudson Corp.  ............................................      878,193 
   25,411    Kmart Corp.*  ...................................................      339,872 
    20,437   Sears, Roebuck & Co.  ...........................................    1,084,438 
   117,651   Wal-Mart Stores, Inc.  ..........................................    5,448,712 
                                                                                ----------- 
                                                                                  8,523,531 
                                                                                ----------- 
             Retail - Specialty (0.2%)                                          
     7,882   AutoZone, Inc.*  ................................................      238,431 
     3,302   Pep Boys-Manny, Moe & Jack  .....................................       84,614 
    14,888   Toys 'R' Us, Inc.*  .............................................      390,810 
     7,039   Woolworth Corp.*  ...............................................      167,176 
                                                                                ----------- 
                                                                                    881,031 
                                                                                ----------- 
             Retail - Specialty Apparel (0.4%)                                  
     5,519   Charming Shoppes, Inc.*  ........................................       24,491 
    20,982   Gap, Inc. (The)  ................................................      937,633 
    14,172   Limited (The), Inc.  ............................................      410,988 
     8,520   TJX Companies, Inc.  ............................................      329,085 
                                                                                ----------- 
                                                                                  1,702,197 
                                                                                ----------- 
             Savings & Loan Companies (0.3%)                                   
     5,714   Ahmanson (H.F.) & Co.  ..........................................      356,768 
     2,959   Golden West Financial Corp.  ....................................      264,091 
    13,434   Washington Mutual, Inc.  ........................................      900,918 
                                                                                ----------- 
                                                                                  1,521,777 
                                                                                ----------- 
             Semiconductor Equipment (0.2%)                                    
    19,023   Applied Materials, Inc.*  .......................................      700,284 
     4,417   KLA-Tencor Corp.*  ..............................................      203,734 
                                                                                ----------- 
                                                                                    904,018 
                                                                                ----------- 
             Specialty Printing (0.1%)                                         
     4,289   Deluxe Corp.  ...................................................      146,094 
     7,629   Donnelley (R.R.) & Sons Co.  ....................................      302,299 
     6,753   Ecolab, Inc.  ...................................................      194,571 
     1,617   Harland (John H.) Co.  ..........................................       24,558 
                                                                                ----------- 
                                                                                    667,522 
                                                                                ----------- 
             Steel & Iron (2.0%)                                               
     9,099   Allegheny Teledyne Inc.  ........................................      246,810 
     5,596   Armco, Inc.  ....................................................       29,729 
     5,876   Bethlehem Steel Corp.*  .........................................       62,433 
     2,549   Inland Steel Industries, Inc.  ..................................       52,573 
     4,584   Nucor Corp.  ....................................................      236,076 
     4,476   USX-U.S. Steel Group, Inc.  .....................................      157,220 
     5,048   Worthington Industries, Inc.  ...................................       86,447 
                                                                                ----------- 
                                                                                    871,288 
                                                                                ----------- 
             Telecommunications -                                              
             Cellular/Wireless (0.3%)                                          
    26,352   Airtouch Communications, Inc.*  .................................    1,184,193 
     6,132   DSC Communications Corp.*  ......................................      120,341 
     7,693   General Instrument Corp.  .......................................      128,377 
                                                                                ----------- 
                                                                                  1,432,911 
                                                                                ----------- 
                             SEE NOTES TO FINANCIAL STATEMENTS

28

<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
PORTFOLIO OF INVESTMENTS February 28, 1998 (unaudited) continued 

 NUMBER OF 
   SHARES                                                                          VALUE 
- -------------------------------------------------------------------------------------------
             Telecommunications - Long Distance (2.3%) 
    84,801   AT&T Corp.  ..................................................... $  5,162,261 
    36,364   MCI Communications Corp.  .......................................    1,738,654 
    22,452   Sprint Corp.  ...................................................    1,481,832 
    52,872   WorldCom, Inc.*  ................................................    2,019,050 
                                                                               ------------ 
                                                                                 10,401,797 
                                                                               ------------ 
             Telephones (5.0%) 
     9,676   Alltel Corp.  ...................................................      442,072 
    57,143   Ameritech Corp.  ................................................    2,382,149 
    40,548   Bell Atlantic Corp.  ............................................    3,639,183 
    51,771   BellSouth Corp.  ................................................    3,158,031 
    18,200   Comcast Corp. (Class A Special)  ................................      637,000 
     8,564   Frontier Corp.  .................................................      237,116 
    49,993   GTE Corp.  ......................................................    2,705,871 
    33,479   Lucent Technologies Inc.  .......................................    3,628,287 
    47,856   SBC Communications, Inc.  .......................................    3,619,110 
             U.S. West Communications 
    25,224   Group  ..........................................................    1,313,225 
                                                                               ------------ 
                                                                                 21,762,044 
                                                                               ------------ 
             Textiles - Apparel (0.1%) 
     3,822   Fruit of the Loom, Inc. (Class A)*  .............................      122,782 
     3,491   Liz Claiborne, Inc.  ............................................      174,550 
     1,899   Russell Corp.  ..................................................       51,510 
     6,380   VF Corp.  .......................................................      304,246 
                                                                               ------------ 
                                                                                    653,088 
                                                                               ------------ 
             Textiles - Home Furnishings (0.0%) 
             Springs Industries, Inc. 
     1,051   (Class A)  ......................................................       58,790 
                                                                               ------------ 
             Tobacco (1.2%) 
   126,577   Philip Morris Companies, Inc.  ..................................    5,498,188 
                                                                               ------------ 
             Truckers (0.0%) 
     3,995   Ryder System, Inc.  .............................................      146,567 
                                                                               ------------ 
             Utilities - Electric (2.4%) 
     7,160   Ameren Corp.  ...................................................      275,213 
     9,876   American Electric Power Co., Inc. ...............................      474,048 
     7,704   Baltimore Gas & Electric Co.  ...................................      243,158 
     7,887   Carolina Power & Light Co.  .....................................      329,282 
    11,074   Central & South West Corp.  .....................................      296,922 
     8,226   CINergy Corp.  ..................................................      286,368 
    12,262   Consolidated Edison Co. of New York, Inc.  ......................      521,135 
     9,760   Dominion Resources, Inc.  .......................................      389,180 
     7,572   DTE Energy Co.  .................................................      278,271 
    18,774   Duke Power Co.  .................................................    1,043,130 
    19,917   Edison International  ...........................................      550,207 
    12,734   Entergy Corp.  ..................................................      368,490 
    12,016   FirstEnergy Corp.*  .............................................      347,713 
     9,498   FPL Group, Inc.  ................................................      551,478 
     6,621   GPU, Inc.  ......................................................      266,081 
    14,884   Houston Industries, Inc.  .......................................      385,124 
     7,534   Niagara Mohawk Power Corp.*  ....................................       96,529 
     3,858   Northern States Power Co.  ......................................      211,949 
    15,459   PacifiCorp  .....................................................      373,915 
    11,610   PECO Energy Co.  ................................................      229,298 
    22,877   PG & E Corp.  ...................................................      690,599 
     8,624   PP&L Resources, Inc.  ...........................................      192,962 
    12,103   Public Service Enterprise Group, Inc.  ..........................      390,322 
    36,031   Southern Co.  ...................................................      889,515 
    12,867   Texas Utilities Co.  ............................................      520,309 
    11,286   Unicom Corp.  ...................................................      361,857 
                                                                               ------------ 
                                                                                 10,563,055 
                                                                               ------------ 
             Utilities - Natural Gas (0.6%) 
     5,531   Coastal Corp.  ..................................................      351,910 
     2,891   Columbia Gas System, Inc.  ......................................      220,619 
     4,977   Consolidated Natural Gas Co.  ...................................      286,178 
     1,062   Eastern Enterprises  ............................................       47,060 
    16,604   Enron Corp.  ....................................................      780,388 
     2,531   NICOR, Inc.  ....................................................      104,087 
     1,619   ONEOK, Inc.  .................................................... $     56,665 
     4,347   Pacific Enterprises  ............................................      157,850 
     1,831   Peoples Energy Corp.  ...........................................       66,145 
     5,739   Sonat, Inc.  ....................................................      247,494 
    16,687   Williams Companies, Inc.  .......................................      545,456 
                                                                               ------------ 
                                                                                  2,863,852 
                                                                               ------------ 
             Waste Management (0.2%) 
    10,320   Browning-Ferris Industries, Inc.  ...............................      343,785 
    23,757   Waste Management Inc.  ..........................................      593,925 
                                                                               ------------ 
                                                                                    937,710 
                                                                               ------------ 
             TOTAL COMMON STOCKS 
             (Identified Cost $390,140,659)  .................................  428,105,597 
                                                                               ------------ 

 PRINCIPAL 
 AMOUNT IN 
 THOUSANDS 
- ----------- 

             SHORT-TERM INVESTMENT (0.7%) 
             REPURCHASE AGREEMENT 

    $2,915   The Bank of New York 5.4375%
               due 03/02/98 (dated 02/27/98; 
                proceeds $2,916,669)(a)
               (Identified Cost $2,915,348) ..................................    2,915,348 
                                                                               ------------ 
             TOTAL INVESTMENTS  ..............................................  431,020,945 
                                                                               ------------ 
                                         DESCRIPTION, 
 NUMBER OF                              DELIVERY YEAR, 
 CONTRACTS                                AND MONTH 
 ---------                                --------- 
               FINANCIAL FUTURES (B)(0.0%) 
               SHORT POSITION 

     23        S&P 500 Index/March 1998  .....................................       (8,150) 
                                                                               ------------ 
TOTAL INVESTMENTS 
(Identified Cost $393,056,007)(c) ................................      98.9%   431,020,945 
                                                                   
TOTAL FINANCIAL FUTURES ..........................................       0.0         (8,150) 
                                                                   
CASH AND OTHER ASSETS IN EXCESS OF                                 
LIABILITIES ......................................................       1.1      4,916,185 
                                                                       -----   ------------
NET ASSETS .......................................................     100.0%  $435,928,980 
                                                                       =====   ============

</TABLE>                            

- --------------
ADR     American Depository Receipt. 
*       Non-income producing security. 
**      Some or all of these securities are segregated in connection with 
        open futures contracts. 
(a)     Collateralized by $330,862 Federal Home Loan Banks 6.55% due 03/04/02 
        valued at $343,209, $1,015,000 Federal Home Loan Banks 6.25% due 
        10/29/01 valued at $1,039,968, $1,000,000 Federal National Mortgage 
        Assoc. 7.15% due 09/15/05 valued at $1,038,943 and $530,069 Federal 
        National Mortgage Assoc. 6.65% due 03/08/06 valued at $551,535. 
(b)     Value represents variation margin on open futures contracts at 
        February 28, 1998. The market value of these futures contracts is 
        $5,901,900 and the unrealized appreciation is $138,268. 
(c)     The aggregate cost for federal income tax purposes approximates 
        identified cost. The aggregate gross unrealized appreciation is 
        $42,956,830 and the aggregate gross unrealized depreciation is 
        $4,991,892, resulting in net unrealized appreciation of $37,964,938. 

                       SEE NOTES TO FINANCIAL STATEMENTS

                                                                             29
<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
FINANCIAL STATEMENTS 

STATEMENT OF ASSETS AND LIABILITIES 
February 28, 1998 (unaudited) 

<TABLE>
<CAPTION>
<S>                                              <C>
ASSETS: 
Investments in securities, at value 
 (identified cost $393,056,007)................  $431,020,945 
Cash...........................................        25,567 
Receivable for: 
  Shares of beneficial interest sold  .........     5,630,771 
  Dividends....................................       637,467 
Deferred organizational expenses ..............        45,271 
Prepaid expenses and other assets .............           980 
                                                 ------------
  TOTAL ASSETS ................................   437,361,001 
                                                 ------------
LIABILITIES: 
Payable for: 
  Shares of beneficial interest repurchased ...       855,292 
  Plan of distribution fee ....................       300,567 
  Investment management fee ...................        57,587 
  Variation margin on futures contracts  ......         8,150 
Organizational expenses .......................        49,500 
Accrued expenses and other payables ...........       160,925 
                                                 ------------
  TOTAL LIABILITIES ...........................     1,432,021 
                                                 ------------
  NET ASSETS...................................  $435,928,980 
                                                 ============
COMPOSITION OF NET ASSETS: 
Paid-in-capital................................  $397,807,150 
Net unrealized appreciation ...................    38,103,206 
Undistributed net investment income............       219,833 
Net realized loss .............................      (201,209) 
                                                 ------------
  NET ASSETS...................................  $435,928,980 
                                                 ============
CLASS A SHARES: 
Net Assets.....................................  $ 19,088,917 
Shares Outstanding (unlimited authorized, $.01 
 par value) ...................................     1,716,869 
  NET ASSET VALUE PER SHARE....................        $11.12 
                                                       ======
  MAXIMUM OFFERING PRICE PER SHARE, 
   (net asset value plus 5.54% of net asset 
   value)......................................        $11.74 
                                                       ======
CLASS B SHARES: 
Net Assets.....................................  $380,009,145 
Shares Outstanding (unlimited authorized, $.01 
 par value) ...................................    34,233,805 
  NET ASSET VALUE PER SHARE ...................        $11.10 
                                                       ======
CLASS C SHARES: 
Net Assets.....................................   $24,126,224 
Shares Outstanding (unlimited authorized, $.01 
 par value) ...................................     2,173,252 
  NET ASSET VALUE PER SHARE ...................        $11.10 
                                                       ======
CLASS D SHARES: 
Net Assets.....................................   $12,704,694 
Shares Outstanding (unlimited authorized, $.01 
 par value) ...................................     1,142,033 
  NET ASSET VALUE PER SHARE ...................        $11.12 
                                                       ======
</TABLE>

STATEMENT OF OPERATIONS 
For the period September 26, 1997* 
through February 28, 1998 (unaudited) 

<TABLE>
<CAPTION>
<S>                                               <C>
NET INVESTMENT INCOME: 
INCOME 
Dividends (net of $3,216 foreign withholding 
 tax)..........................................   $ 1,967,904 
Dividends from affiliate (Note 4)..............         7,287 
Interest ......................................       398,787 
                                                  -----------
  TOTAL INCOME ................................     2,373,978 
                                                  -----------
EXPENSES                                         
Plan of distribution fee (Class A shares)  ....        12,848 
Plan of distribution fee (Class B shares)  ....     1,127,620 
Plan of distribution fee (Class C shares) .....        75,709 
Investment management fee......................       510,357 
Registration fees .............................       136,736 
Transfer agent fees and expenses...............       117,693 
Custodian fees.................................        38,277 
Professional fees .............................        17,577 
S&P license fees ..............................        12,759 
Shareholder reports and notices ...............         6,426 
Trustees' fees and expenses....................         6,145 
Organizational expenses .......................         4,229 
                                                  -----------
  TOTAL EXPENSES...............................     2,066,376 
Less: amounts waived/reimbursed................      (212,252) 
                                                  -----------
  NET EXPENSES ................................     1,854,124 
                                                  -----------
  NET INVESTMENT INCOME........................       519,854 
                                                  -----------
NET REALIZED AND UNREALIZED GAIN (LOSS):         
Net realized loss on:                            
  Investments .................................       (67,320) 
  Futures contracts............................      (133,889) 
                                                  -----------
  NET LOSS.....................................      (201,209) 
                                                  -----------
Net unrealized appreciation on:                  
  Investments .................................    37,964,938 
  Futures contracts............................       138,268 
                                                  -----------
  NET GAIN.....................................    38,103,206 
                                                  -----------
NET INCREASE...................................   $38,421,851 
                                                  ===========
</TABLE>                                      

- --------------
*   Commencement of operations. 

                       SEE NOTES TO FINANCIAL STATEMENTS

30

<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
FINANCIAL STATEMENTS, continued 


STATEMENT OF CHANGES IN NET ASSETS 

<TABLE>
<CAPTION>
                                                                    FOR THE PERIOD 
                                                                 SEPTEMBER 26, 1997* 
                                                                       THROUGH 
                                                                  FEBRUARY 28, 1998 
- ------------------------------------------------------------------------------------ 
                                                                     (UNAUDITED) 
<S>                                                                  <C>
INCREASE (DECREASE) IN NET ASSETS: 
OPERATIONS: 
Net investment income ..........................................     $    519,854 
Net realized loss...............................................         (201,209) 
Net unrealized appreciation.....................................       38,103,206 
                                                                     ------------
  NET INCREASE .................................................       38,421,851 
                                                                     ------------
DIVIDENDS TO SHAREHOLDERS FROM NET INVESTMENT INCOME: 
Class A shares..................................................          (32,194) 
Class B shares..................................................         (218,935) 
Class C shares..................................................          (12,314) 
Class D shares..................................................          (36,578) 
                                                                     ------------
  TOTAL DIVIDENDS  .............................................         (300,021) 
                                                                     ------------
Net increase from transactions in shares of beneficial interest.      397,707,150 
                                                                     ------------
  NET INCREASE .................................................      435,828,980 
NET ASSETS: 
Beginning of period.............................................          100,000 
                                                                     ------------
  END OF PERIOD 
  (Including undistributed net investment income of $219,833) ..     $435,928,980 
                                                                     ============
</TABLE>

- --------------
*  Commencement of operations. 

                       SEE NOTES TO FINANCIAL STATEMENTS

                                                                             31
<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
NOTES TO FINANCIAL STATEMENTS February 28, 1998 (unaudited) 


1. ORGANIZATION AND ACCOUNTING POLICIES 

Dean Witter S&P 500 Index Fund (the "Fund") is registered under the 
Investment Company Act of 1940, as amended (the "Act"), as a diversified, 
open-end management investment company. The Fund's investment objective is to 
provide investment results that, before expenses, correspond to the total 
return of the Standard & Poor's 500 Composite Stock Price Index (the "S&P 500 
Index"). The Fund seeks to achieve its objective by investing at least 80% of 
its total assets in common stocks included in the S&P 500 Index in 
approximately the same weighting as the Index. The Fund was organized as a 
Massachusetts business trust on June 18, 1997 and had no other operations 
other than those relating to organizational matters and the issuance of 2,500 
shares of beneficial interest by each class for $25,000 of each class to Dean 
Witter InterCapital Inc. (the "Investment Manager") to effect the Fund's 
initial capitalization. The Fund commenced operations on September 26, 1997. 

The Fund offers Class A shares, Class B shares, Class C shares and Class D 
shares. The four classes are substantially the same except that most Class A 
shares are subject to a sales charge imposed at the time of purchase, some 
Class A shares, and most Class B shares and Class C shares are subject to a 
contingent deferred sales charge imposed on shares redeemed within one year, 
six years and one year, respectively. Class D shares are not subject to a 
sales charge. Additionally, Class A shares, Class B shares and Class C shares 
incur distribution expenses. 

The preparation of financial statements in accordance with generally accepted 
accounting principles requires management to make estimates and assumptions 
that affect the reported amounts and disclosures. Actual results could differ 
from those estimates. 

The following is a summary of significant accounting policies: 

A. VALUATION OF INVESTMENTS -- (1) an equity security listed or traded on the 
New York, American or other domestic or foreign stock exchange is valued at 
its latest sale price on that exchange prior to the time when assets are 
valued; if there were no sales that day, the security is valued at the latest 
bid price (in cases where a security is traded on more than one exchange, the 
security is valued on the exchange designated as the primary market pursuant 
to procedures adopted by the Trustees); (2) all other portfolio securities 
for which over-the-counter market quotations are readily available are valued 
at the latest available bid price prior to the time of valuation; (3) when 
market quotations are not readily available, including circumstances under 
which it is determined by the Investment Manager that sale or bid prices are 
not reflective of a security's market value, portfolio securities are valued 
at their fair value as determined in good faith under procedures established 
by and under the general supervision of the Trustees; and (4) short-term debt 
securities having a maturity date of more than sixty days at time of purchase 
are valued on a mark-to-market basis until sixty days prior to maturity and 
thereafter at amortized cost based on their value on the 61st day. Short-term 
debt securities having a maturity date of sixty days or less at the time of 
purchase are valued at amortized cost. 

B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on 
the trade date (date the order to buy or sell is executed). Realized gains 
and losses on security transactions are determined by the identified cost 
method. Dividend income and other distributions are recorded on the 
ex-dividend date. Discounts are accreted over the respective life of the 
securities. Interest income is accrued daily. 

C. MULTIPLE CLASS ALLOCATIONS -- Investment income, expenses (other than 
distribution fees), and realized and unrealized gains and losses are 
allocated to each class of shares based upon the relative net asset value on 
the date such items are recognized. Distribution fees are charged directly to 
the respective class. 

32

<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
NOTES TO FINANCIAL STATEMENTS February 28, 1998 (unaudited) continued 


D. FEDERAL INCOME TAX STATUS -- It is the Fund's policy to comply with the 
requirements of the Internal Revenue Code applicable to regulated investment 
companies and to distribute all of its taxable income to its shareholders. 
Accordingly, no federal income tax provision is required. 

E. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends 
and distributions to its shareholders on the ex-dividend date. The amount of 
dividends and distributions from net investment income and net realized 
capital gains are determined in accordance with federal income tax 
regulations which may differ from generally accepted accounting principles. 
These "book/tax" differences are either considered temporary or permanent in 
nature. To the extent these differences are permanent in nature, such amounts 
are reclassified within the capital accounts based on their federal tax-basis 
treatment; temporary differences do not require reclassification. Dividends 
and distributions which exceed net investment income and net realized capital 
gains for financial reporting purposes but not for tax purposes are reported 
as dividends in excess of net investment income or distributions in excess of 
net realized capital gains. To the extent they exceed net investment income 
and net realized capital gains for tax purposes, they are reported as 
distributions of paid-in-capital. 

F. ORGANIZATIONAL EXPENSES -- The Investment Manager incurred the 
organizational expenses of the Fund in the amount of approximately $49,500 
which will be reimbursed for the full amount thereof. Such expenses have been 
deferred and are being amortized on the straight-line method over a period 
not to exceed five years from the commencement of operations. 

2. INVESTMENT MANAGEMENT AGREEMENT 

Pursuant to an Investment Management Agreement, the Fund pays the Investment 
Manager a management fee, accrued daily and payable monthly, by applying the 
annual rate of 0.40% to the net assets of the Fund determined as of the close 
of each business day. 

Under the terms of the Agreement, in addition to managing the Fund's 
investments, the Investment Manager maintains certain of the Fund's books and 
records and furnishes, at its own expense, office space, facilities, 
equipment, clerical, bookkeeping and certain legal services and pays the 
salaries of all personnel, including officers of the Fund who are employees 
of the Investment Manager. The Investment Manager also bears the cost of 
telephone services, heat, light, power and other utilities provided to the 
Fund. 

The Investment Manager has agreed to assume all operating expenses (except 
for 12b-1 fees) and to waive the compensation provided for in its Investment 
Management Agreement to the extent that such expenses and compensation on an 
annualized basis exceed 0.50% of the daily net assets of the Fund. 

3. PLAN OF DISTRIBUTION 

Shares of the Fund are distributed by Dean Witter Distributors Inc. (the 
"Distributor"), an affiliate of the Investment Manager. The Fund has adopted 
a Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the Act. The 
Plan provides that the Fund will pay the Distributor a fee which is accrued 
daily and paid monthly at the following annual rates: (i) Class A -up to 
0.25% of the average daily net assets of Class A; (ii) Class B -1.0% of the 
average daily net assets of Class B; and (iii) Class C -up to 1.0% of the 
average daily net assets of Class C. In the case of Class A shares, amounts 
paid under the Plan are paid to the Distributor for services provided. In the 
case of Class B and Class C shares, amounts paid under the Plan are paid to 
the Distributor for services provided and the expenses borne by it and others 
in the distribution of the shares of these Classes, including the payment of 
commissions for sales of these 

                                                                             33
<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
NOTES TO FINANCIAL STATEMENTS February 28, 1998 (unaudited) continued 


Classes and incentive compensation to, and expenses of, the account 
executives of Dean Witter Reynolds Inc. ("DWR"), an affiliate of the 
Investment Manager and Distributor, and others who engage in or support 
distribution of the shares or who service shareholder accounts, including 
overhead and telephone expenses; printing and distribution of prospectuses 
and reports used in connection with the offering of these shares to other 
than current shareholders; and preparation, printing and distribution of 
sales literature and advertising materials. In addition, the Distributor may 
utilize fees paid pursuant to the Plan, in the case of Class B shares, to 
compensate DWR and other selected broker-dealers for their opportunity costs 
in advancing such amounts, which compensation would be in the form of a 
carrying charge on any unreimbursed expenses. 

In the case of Class B shares, provided that the Plan continues in effect, 
any cumulative expenses incurred by the Distributor but not yet recovered may 
be recovered through the payment of future distribution fees from the Fund 
pursuant to the Plan and contingent deferred sales charges paid by investors 
upon redemption of Class B shares. Although there is no legal obligation for 
the Fund to pay expenses incurred in excess of payments made to the 
Distributor under the Plan and the proceeds of contingent deferred sales 
charges paid by investors upon redemption of shares, if for any reason the 
Plan is terminated, the Trustees will consider at that time the manner in 
which to treat such expenses. The Distributor has advised the Fund that such 
excess amounts, including carrying charges, totaled $15,470,964 at February 
28, 1998. 

In the case of Class A shares and Class C shares, expenses incurred pursuant 
to the Plan in any calendar year in excess of 0.25% or 1.0% of the average 
daily net assets of Class A or Class C, respectively, will not be reimbursed 
by the Fund through payments in any subsequent year, except that expenses 
representing a gross sales credit to account executives may be reimbursed in 
the subsequent calendar year. For the period ended February 28, 1998, the 
distribution fee was accrued for Class A shares and Class C shares at the 
annual rate of 0.24% and 1.0%, respectively. 

The Distributor has informed the Fund that for the period ended February 28, 
1998, it received contingent deferred sales charges from certain redemptions 
of the Fund's Class A shares, Class B shares and Class C shares of $1,233, 
$176,043 and $2,465, respectively and received $317,745 in front-end sales 
charges from sales of the Fund's Class A shares. The respective shareholders 
pay such charges which are not an expense of the Fund. 

4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES 

The cost of purchases and proceeds from sales of portfolio securities, 
excluding short-term investments, for the period ended February 28, 1998 
aggregated $391,998,552 and $1,790,565, respectively. Included in the 
aforementioned are purchases of U.S. Government securities of $4,238,575, and 
purchases of Morgan Stanley, Dean Witter, Discover & Co. common stock of 
$1,744,549. 

34

<PAGE>

DEAN WITTER S&P 500 INDEX FUND 
NOTES TO FINANCIAL STATEMENTS February 28, 1998 (unaudited) continued 


5. SHARES OF BENEFICIAL INTEREST 

Transactions in shares of beneficial interest were as follows: 

<TABLE>
<CAPTION>
                                                        FOR THE PERIOD       
                                                      SEPTEMBER 26, 1997* 
                                                            THROUGH 
                                                       FEBRUARY 28, 1998 
                                                  --------------------------
                                                    SHARES         AMOUNT 
                                                  ----------    ------------ 
<S>                                                <C>          <C>
CLASS A                                         
Sold............................................   2,174,952    $ 22,337,813 
Reinvestment of                                 
 dividends......................................       2,992          30,640 
Redeemed........................................    (463,575)     (4,833,628) 
                                                  ----------    ------------ 
Net increase - Class A .........................   1,714,369      17,534,825 
                                                  ----------    ------------ 
CLASS B                                         
Sold............................................  35,877,610     363,073,563 
Reinvestment of                                 
 dividends......................................      19,650         201,230 
Redeemed........................................  (1,665,955)    (17,145,091) 
                                                  ----------    ------------ 
Net increase - Class B .........................  34,231,305     346,129,702 
                                                  ----------    ------------ 
CLASS C                                         
Sold............................................   2,361,111      23,865,804 
Reinvestment of                                 
 dividends......................................       1,135          11,618 
Redeemed........................................    (191,494)     (1,986,049) 
                                                  ----------    ------------ 
Net increase - Class C .........................   2,170,752      21,891,373 
                                                  ----------    ------------ 
CLASS D                                         
Sold............................................   2,170,273      22,597,466 
Reinvestment of                                 
 dividends......................................         189           1,939 
Redeemed........................................  (1,030,929)    (10,448,155) 
                                                  ----------    ------------ 
Net increase - Class D .........................   1,139,533      12,151,250 
                                                  ----------    ------------ 
Net increase in Fund ...........................  39,255,959    $397,707,150 
                                                  ==========    ============
</TABLE>                   

- --------------
*     Commencement of operations. 

6. FINANCIAL HIGHLIGHTS 

See the "Financial Highlights" table on page 5 of this prospectus. 

                                                                             35
<PAGE>

DEAN WITTER 
S&P 500 INDEX FUND 
TWO WORLD TRADE CENTER 
NEW YORK, NEW YORK 10048 


TRUSTEES 

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


OFFICERS 

Charles A. Fiumefreddo 
Chairman and Chief Executive Officer 
Barry Fink 
Vice President, Secretary and 
General Counsel 
Kenton J. Hinchliffe 
Vice President 
Thomas F. Caloia 
Treasurer 


CUSTODIAN 

The Bank of New York 
90 Washington Street 
New York, New York 10286 


TRANSFER AGENT AND 
DIVIDEND DISBURSING AGENT 

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


INDEPENDENT ACCOUNTANTS 

Price Waterhouse LLP 
1177 Avenue of the Americas 
New York, New York 10036 


INVESTMENT MANAGER 

Dean Witter InterCapital Inc. 




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