WITTER DEAN NATURAL RESOURCE DEVELOPMENT SECURITIES INC
497, 1996-05-07
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<PAGE>
 
<TABLE>
<S>                                                        <C>
              PROSPECTUS                                   TABLE OF CONTENTS
              APRIL 23, 1996                               Prospectus Summary/2
              Dean Witter Natural Resource Development     Summary of Fund Expenses/3
Securities Inc. (the "Fund") is an open-end diversified    Financial Highlights/4
management investment company whose investment objective   The Fund and its Management/4
is capital growth. The Fund invests primarily in common    Investment Objective and Policies/5
stock of companies in the natural resources and related    Risk Considerations and Investment Practices/6
areas, including companies engaged in the exploration for  Investment Restrictions/10
and development, production and distribution of natural    Purchase of Fund Shares/10
resources or in the development of energy-efficient        Shareholder Services/13
technologies or other natural resource related supplies    Redemptions and Repurchases/15
or products. (See "Investment Objective and Policies.")    Dividends, Distributions and Taxes/17
               Shares of the Fund are continuously         Performance Information/18
offered at net asset value. However, redemptions and/or    Additional Information/19
repurchases are subject in most circumstances to a         SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR
contingent deferred sales charge, scaled down from 5% to   GUARANTEED OR ENDORSED BY, ANY BANK, AND THE SHARES ARE
1% of the amount redeemed, if made within six years of     NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE
purchase, which charge will be paid to the Fund's          CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER
Distributor, Dean Witter Distributors Inc. (See            AGENCY.
"Redemptions and Repurchases--Contingent Deferred Sales    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY
Charge.") In addition, the Fund pays the Distributor a     THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
distribution fee pursuant to a Plan of Distribution at     SECURITIES COMMISSION NOR HAS THE SECURITIES AND EXCHANGE
the annual rate of 1% of the lesser of the (i) average     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
daily aggregate net sales since inception of the Plan of   THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
Distribution or (ii) average daily net assets of the Fund  REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
attributable to shares issued since the inception of the   Dean Witter
Plan of Distribution. (See "Purchase of Fund Shares--Plan  Natural Resource Development
of Distribution.")                                         Securities Inc.
               This Prospectus sets forth concisely the    Two World Trade Center
information you should know before investing in the Fund.  New York, New York 10048
It should be read and retained for future reference.       (212) 392-2550 or
Additional information about the Fund is contained in the  (800) 869-NEWS (toll-free)
Statement of Additional Information, dated April 23,
1996, 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.
    DEAN WITTER DISTRIBUTORS INC.
    DISTRIBUTOR
</TABLE>
<PAGE>
 
<TABLE>
<S>                  <C>
PROSPECTUS SUMMARY
The                  The Fund, a Maryland corporation, is an open-end diversified management
Fund                 investment company investing primarily in common stock of companies in the
                     natural resources and related areas.
Shares Offered       Common Stock with $0.01 par value (see page 19).
Offering             At net asset value. (see page 10). Shares redeemed within six years of purchase
Price                are subject to a contingent deferred sales charge under most circumstances (see
                     page 16).
Minimum Purchase     Minimum initial investment $1,000; ($100 if the account is opened through
                     EasyInvest -SM-); minimum subsequent investment $100 (see page 10).
Investment           The investment objective of the Fund is capital growth.
Objective
Investment           Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the
Manager              Fund, and its wholly-owned subsidiary, Dean Witter Services Company Inc., serve
                     in various investment management, advisory, management and administrative
                     capacities to ninety-six investment companies and other portfolios with assets
                     of approximately $82.5 billion at February 29, 1996 (see page 4).
Management           The Investment Manager receives a monthly fee at an annual rate of 0.625 of 1%
Fee                  of daily net assets up to $250 million and 0.50 of 1% of daily net assets over
                     $250 million.
Dividends and        Dividends  from net investment income dividends paid annually; capital gains, if
Capital Gains        any, distributed annually or  retained for reinvestment  by the Fund.  Dividends
Distributions        and capital gains distributions automatically reinvested in additional shares at
                     net asset value unless the shareholder elects to receive cash (see page 17).
Distributor          Dean Witter Distributors Inc. (the "Distributor"). The Distributor receives from
                     the Fund a distribution fee accrued daily and payable monthly at the rate of
                     1.0% per annum of the lesser of (a) the Fund's average daily aggregate net sales
                     or (b) the Fund's average daily net assets. This fee compensates the Distributor
                     for the services provided in distributing shares of the Fund and for its sales
                     related expenses (see pages 11 and 15). The Distributor also receives the
                     proceeds of any contingent deferred sales charges.
Redemption --        Shares are redeemable by the shareholder at net asset value. An account may be
Contingent Deferred  involuntarily redeemed if the total value of the account is less than $100, or,
Sales Charge         if the account was opened through EasyInvest -SM-, if after twelve months the
                     shareholder has invested less than $1,000 in the account. Although no commission
                     or sales charge is imposed upon the purchase of shares, a contingent deferred
                     sales charge (scaled down from 5% to 1%) is imposed on any redemption of shares
                     which causes the aggregate current value of an account with the Fund to fall
                     below the aggregate amount of the investor's purchase payments made during the
                     preceding six years. There is no charge imposed on redemption of shares
                     purchased through reinvestment of dividends or distributions (see page 15).
Retirement           You can take advantage of tax benefits for personal retirement accounts by
Plans                investing in the Fund through an IRA (Individual Retirement Account) or
                     Custodial Account under Section 403(b)(7) of the Internal Revenue Code (see page
                     13).
Risks                The net asset value of the Fund's shares will fluctuate with changes in market
                     value of portfolio securities. Emphasis on natural resources may result in
                     exposure of some companies to foreign political and currency risks and
                     substantial price fluctuations (see page 6). Investors should review the
                     investment objective and policies of the Fund carefully and consider their
                     ability to assume the risks involved in purchasing shares of the Fund (see pages
                     5 through 9). The Fund may also invest in futures and options 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 (see pages 7 through 8). In addition, the investor is directed to
                     the discussions of foreign securities on page 6.
       THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING ELSEWHERE
                  IN THE PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
</TABLE>
 
                                       2
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SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
    The  following table illustrates all expenses and fees that a shareholder of
the Fund will incur. The  expenses and fees set forth  in the table are for  the
fiscal year ended February 29, 1996, except as otherwise noted.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                   <C>                                   <C>                <C>
Maximum Sales Charge Imposed on Purchases....................................................       None
Maximum Sales Charge Imposed on Reinvested Dividends.........................................       None
Deferred Sales Charge
 (as a percentage of the lesser of original purchase price or redemption proceeds)...........       5.0%
 A contingent deferred sales charge is imposed at the following declining rates:
</TABLE>
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE                                                                 PERCENTAGE OF
PAYMENT MADE                                                                       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>
 
<TABLE>
<S>                                  <C>                                  <C>                <C>
Redemption Fees............................................................................       None
Exchange Fees..............................................................................       None
</TABLE>
 
<TABLE>
<CAPTION>
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
<S>                                                                                        <C>
Management Fees..........................................................................       0.63%
12b-1 Fees*..............................................................................       0.97%
Other Expenses...........................................................................       0.30%
Total Fund Operating Expenses............................................................       1.90%
<FN>
- ---------------
*     A  portion of  the 12b-1  fee, which  may not  exceed 0.25%  of the Fund's
      average daily net  assets, is characterized  as a service  fee within  the
      meaning  of National Association of Securities Dealers ("NASD") guidelines
      (see "Purchase of Fund Shares").
</TABLE>
 
<TABLE>
<CAPTION>
EXAMPLE                                                                 1 YEAR   3 YEARS  5 YEARS  10 YEARS
- ----------------------------------------------------------------------  -------  -------  -------  --------
<S>                                                                     <C>      <C>      <C>      <C>
You would pay the following expenses on a $1,000 investment, assuming
 (1) 5% annual return and (2) redemption at the end of each time
 period...............................................................    $ 69     $ 90     $123     $222
You would pay the following expenses on the same investment, assuming
 no redemption........................................................    $ 19     $ 60     $103     $222
</TABLE>
 
    THE ABOVE  EXAMPLE SHOULD  NOT BE  CONSIDERED A  REPRESENTATION OF  PAST  OR
FUTURE  EXPENSES OR PERFORMANCE. ACTUAL  EXPENSES OF THE FUND  MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
    The purpose of  this table is  to assist the  investor in understanding  the
various  costs and expenses that  an investor in the  Fund will bear directly or
indirectly. For a  more complete description  of these costs  and expenses,  see
"The  Fund  and its  Management," "Plan  of  Distribution" and  "Redemptions and
Repurchases."
 
    Long-term shareholders  of  the Fund  may  pay  more in  sales  charges  and
distribution  fees than the  economic equivalent of  the maximum front-end sales
charges permitted by the NASD.
 
                                       3
<PAGE>
FINANCIAL HIGHLIGHTS
 
- --------------------------------------------------------------------------------
 
    The following  ratios  and per  share  data for  a  share of  capital  stock
outstanding  throughout each period  have been audited  by Price Waterhouse LLP,
independent accountants. The financial highlights should be read in  conjunction
with  the financial  statements, notes  thereto, and  the unqualified  report of
independent accountants  which  are contained  in  the Statement  of  Additional
Information.  Further information about the performance of the Fund is contained
in the  Fund's Annual  Report to  Shareholders, which  may be  obtained  without
charge upon request to the Fund.
 
<TABLE>
<CAPTION>
                                               FOR THE YEAR ENDED FEBRUARY 28
                  ----------------------------------------------------------------------------------------
                   1996*    1995     1994     1993     1992*    1991     1990     1989     1988*    1987
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
<S>               <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>
PER SHARE OPERATING
 PERFORMANCE:
  Net asset
   value,
   beginning of
   period........  $10.77   $11.82   $11.36   $10.20   $11.03   $11.33   $ 9.93   $ 9.46   $ 9.10   $ 7.43
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Net investment
   income........    0.06     0.09     0.09     0.16     0.20     0.25     0.30     0.23     0.20     0.14
  Net realized
   and unrealized
   gain (loss)...    2.53    (0.24)    1.25     1.18    (0.44)    0.02     1.80     0.72     0.44     1.75
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Total from
   investment
   operations....    2.59    (0.15)    1.34     1.34    (0.24)    0.27     2.10     0.95     0.64     1.89
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Less dividends
   and
   distributions
   from:
    Net
     investment
     income......   (0.04)   (0.12)   (0.09)   (0.18)   (0.20)   (0.28)   (0.32)   (0.21)   (0.28)   (0.22)
    Net realized
     gain........   (0.62)   (0.78)   (0.79)      --    (0.39)   (0.29)   (0.38)   (0.27)      --       --
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Total dividends
   and
 distributions...   (0.66)   (0.90)   (0.88)   (0.18)   (0.59)   (0.57)   (0.70)   (0.48)   (0.28)   (0.22)
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
  Net asset
   value,
   end of
   period........  $12.70   $10.77   $11.82   $11.36   $10.20   $11.03   $11.33   $ 9.93   $ 9.46   $ 9.10
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
TOTAL INVESTMENT
 RETURN+.........  24.32%  (1.26)%   12.16%   13.31%  (1.91)%    2.87%   21.11%   10.29%    7.32%   26.21%
RATIOS TO AVERAGE
 NET ASSETS:
  Expenses.......   1.90%    1.90%    1.91%    1.96%    1.93%    1.80%    1.81%    1.92%    1.81%    1.74%
  Net investment
   income........   0.52%    0.77%    0.73%    1.46%    1.67%    2.28%    2.57%    2.09%    2.14%    2.61%
SUPPLEMENTAL
 DATA:
  Net assets, end
   of period, in
   thousands..... $152,661 $132,812 $139,459 $118,496 $113,145 $150,636 $154,741 $136,911 $171,725 $82,985
  Portfolio
   turnover
   rate..........     49%      59%      69%      52%      31%      29%      22%       7%      26%      14%
</TABLE>
 
- ---------------
 
* YEAR ENDED FEBRUARY 29.
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE.
 
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Dean  Witter Natural Resource Development Securities Inc. (the "Fund") is an
open-end diversified management investment  company incorporated in Maryland  on
December 22, 1980.
 
    Dean  Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
investment manager.  The Investment  Manager, which  was incorporated  in  July,
1992,  is a wholly-owned subsidiary  of Dean Witter, Discover  & Co. ("DWDC"), a
balanced financial services organization providing  a broad range of  nationally
marketed credit and investment products.
 
    InterCapital  and its wholly-owned subsidiary,  Dean Witter Services Company
Inc.,  serve  in  various   investment  management,  advisory,  management   and
administrative  capacities to  ninety-six investment companies,  thirty of which
are listed on
 
                                       4
<PAGE>
the New York Stock Exchange, with  combined total assets of approximately  $79.9
billion as of February 29, 1996. The Investment Manager also manages and advises
portfolios of pension plans, other institutions and individuals which aggregated
approximately $2.6 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 to the Fund.
 
    The  Fund's Board of Directors reviews  the various services provided by the
Investment Manager to  ensure that  the Fund's general  investment policies  and
programs  are being  properly carried out  and that  administrative services are
being provided to the Fund in a satisfactory manner.
 
    As full compensation for the services  and facilities furnished to the  Fund
and  for expenses of the  Fund assumed by the  Investment Manager, the Fund pays
the Investment Manager  monthly compensation  calculated daily  by applying  the
following  annual rates to the net assets of the Fund determined as of the close
of each  business  day: 0.625%  of  the portion  of  the daily  net  assets  not
exceeding  $250  million  and 0.50%  of  the  portion of  the  daily  net assets
exceeding $250 million. For  the fiscal year ended  February 29, 1996, the  Fund
accrued  total compensation to the Investment  Manager amounting to 0.63% of the
Fund's average daily net assets and the Fund's total expenses amounted to  1.90%
of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
    The  investment  objective  of  the  Fund is  capital  growth.  There  is no
assurance that the objective will be achieved. This objective is fundamental and
may not be changed  without the approval  of the stockholders  of the Fund.  The
Fund will invest primarily in common stock of companies in the natural resources
and  related areas, and will invest at least 65% of its net assets at all times,
except for  temporary and  defensive purposes,  in the  securities of  companies
engaged  in these areas. A portfolio company is considered to be so engaged when
at least 50% of its assets and/or revenues are currently the result of ownership
or development of assets in such areas. Such companies include those engaged  in
the  exploration  for and  development, production  and distribution  of natural
resources, in  the  development of  energy-efficient  technologies or  in  other
natural resource related supplies or services.
 
    The  Fund will  seek capital  growth by  investing in  securities of issuers
believed to be responsive to domestic and world demand for natural resources. As
a result  of  the challenges  presented  by  natural resource  needs,  the  Fund
believes  that opportunities  for growth can  be found in  securities of issuers
which: (1) own  or process  natural resources,  such as  precious metals,  other
minerals,  water, timberland and forest products;  (2) own or produce sources of
energy such  as oil,  natural  gas, coal,  uranium,  geothermal, oil  shale  and
biomass;  (3)  participate in  the exploration  for  and development  of natural
resources supplies from new  and conventional sources; (4)  own or control  oil,
gas,  or  other mineral  leases  (which may  not  produce recoverable  energy or
resources),  rights  or  royalty   interests;  (5)  provide  natural   resources
transportation,  distribution  or  processing  services,  such  as  refining and
pipeline services; (6) provide related  services or supplies, such as  drilling,
well  servicing,  chemicals, parts  and  equipment; and  (7)  contribute energy-
efficient technologies, such as systems for energy conversion, conservation  and
pollution  control. Emphasis on natural resources may result in exposure of some
portfolio companies  to foreign  political and  currency risks  and  substantial
price fluctuations.
 
                                       5
<PAGE>
    The Fund may purchase securities on a when issued or delayed delivery basis,
may  purchase or sell securities on a  forward commitment basis and may purchase
securities on  a "when,  as and  if  issued" basis,  may enter  into  repurchase
agreements  and may invest in options  and futures transactions all as described
below.
 
RISK CONSIDERATIONS AND INVESTMENT PRACTICES
 
    FOREIGN SECURITIES.    Foreign securities  investments  may be  affected  by
changes   in  currency  rates  or   exchange  control  regulations,  changes  in
governmental administration or economic or monetary policy (in the United States
and abroad) or changed circumstances  in dealings between nations.  Fluctuations
in  the relative rates  of exchange between the  currencies of different nations
will affect the value of the Fund's investments denominated in foreign currency.
Changes in foreign  currency exchange  rates relative  to the  U.S. dollar  will
affect  the U.S. dollar value of the  Fund's assets denominated in that currency
and thereby impact upon the Fund's total return on such assets.
 
    Foreign currency  exchange rates  are  determined by  forces of  supply  and
demand  on the foreign exchange markets. These forces are themselves affected by
the  international  balance  of  payments  and  other  economic  and   financial
conditions,  government intervention,  speculation and  other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges on which the currencies trade.
 
    Investments in  foreign  securities will  also  occasion risks  relating  to
political  and  economic  developments  abroad,  including  the  possibility  of
expropriations or confiscatory taxation, limitations  on the use or transfer  of
Fund   assets  and  any  effects  of   foreign  social,  economic  or  political
instability. Foreign companies are not subject to the regulatory requirements of
U.S. companies and, as  such, there may be  less publicly available  information
about  such companies.  Moreover, foreign companies  are not  subject to uniform
accounting,  auditing  and  financial   reporting  standards  and   requirements
comparable to those applicable to U.S. companies.
 
    Securities  of foreign issuers may be less liquid than comparable securities
of U.S.  issuers  and,  as such,  their  price  changes may  be  more  volatile.
Furthermore,  foreign exchanges and broker-dealers are generally subject to less
government  and   exchange  scrutiny   and   regulation  than   their   American
counterparts.  Brokerage commissions,  dealer concessions  and other transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements of  the  Fund's  trades  effected in  such  markets.  As  such,  the
inability  to dispose  of portfolio  securities due  to settlement  delays could
result in  losses to  the  Fund due  to subsequent  declines  in value  of  such
securities and the inability of the Fund to make intended security purchases due
to settlement problems could result in a failure of the Fund to make potentially
advantageous   investments.  To   the  extent  the   Fund  purchases  Eurodollar
certificates of deposit  issued by  foreign branches of  domestic Unites  States
banks,  consideration will be  given to their  domestic marketability, the lower
reserve requirements  normally mandated  for  overseas banking  operations,  the
possible   impact  of  interruptions  in  the  flow  of  international  currency
transactions and future international political and economic developments  which
might adversely affect the payment of principal or interest.
 
    PRIVATE  PLACEMENTS.  The  Fund may invest up  to 5% of  its total assets in
securities which are  subject to restrictions  on resale because  they have  not
been  registered under the  Securities Act of 1933,  as amended (the "Securities
Act"), or which are otherwise  not readily marketable. (Securities eligible  for
resale  pursuant to  Rule 144A  under the Securities  Act, and  determined to be
liquid pursuant to the procedures discussed in the following paragraph, are  not
subject  to the foregoing restriction).  These securities are generally referred
to as private placements or restricted securities. Limitations on the resale  of
such  securities  may have  an adverse  effect on  their marketability,  and may
prevent the Fund from disposing of them promptly at reasonable prices. The  Fund
may have to bear the expense of
 
                                       6
<PAGE>
registering  such securities  for resale and  the risk of  substantial delays in
effecting such registration.
 
    The Securities  and Exchange  Commission  has adopted  Rule 144A  under  the
Securities  Act,  which  permits  the  Fund  to  sell  restricted  securities to
qualified institutional  buyers  without  limitation.  The  Investment  Manager,
pursuant  to  procedures adopted  by  the Directors  of  the Fund,  will  make a
determination as to the liquidity of  each restricted security purchased by  the
Fund.  If a restricted security is determined to be "liquid," such security will
not be included within the  category "illiquid securities," which under  current
policy may not exceed 15% of the Fund's total assets.
 
    REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which
may  be viewed  as a type  of secured lending  by the Fund,  and which typically
involve the acquisition by the Fund of debt securities from a selling  financial
institution  such as a bank, savings  and loan association or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the  future, usually not more than  seven days from the date  of
purchase.  While repurchase agreements involve certain risks not associated with
direct investments in debt securities,  the Fund follows procedures designed  to
minimize  those risks. See the Statement of Additional Information for a further
discussion of such investments.
 
    ZERO COUPON SECURITIES.  A portion of the fixed-income securities  purchased
by  the Fund may be  zero coupon securities. Such  securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest  earned on such securities is,  implicitly,
automatically  compounded and paid out at  maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if  prevailing interest  rates  decline, the  owner  of a  zero  coupon
security  will be  unable to participate  in higher yields  upon reinvestment of
interest received  on interest-paying  securities if  prevailing interest  rates
rise.
 
    A  zero coupon  security pays  no interest  to its  holder during  its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash  available for distribution  to shareholders. In  addition,
zero  coupon securities are subject  to substantially greater price fluctuations
during periods  of  changing  prevailing  interest  rates  than  are  comparable
securities  which  pay interest  on  a current  basis.  Current federal  tax law
requires that a holder  (such as the  Fund) of a zero  coupon security accrue  a
portion  of the discount at which the security was purchased as income each year
even though  the Fund  receives no  interest payments  in cash  on the  security
during the year.
 
OPTIONS AND FUTURES TRANSACTIONS
 
    The  Fund may  purchase and sell  (write) call  and put options  on debt and
equity securities which  are listed  on Exchanges  or are  written in  over-the-
counter transactions ("OTC Options"). Listed options, which are currently listed
on  several different Exchanges, are issued  by the Options Clearing Corporation
("OCC"). OTC  options  are  purchased  from or  sold  (written)  to  dealers  or
financial  institutions which have entered into direct agreements with the Fund.
The Fund  will  engage  in  OTC  option  transactions  only  with  primary  U.S.
Government  securities dealers  recognized by  the Federal  Reserve Bank  of New
York. The Fund will not write covered options on portfolio securities  exceeding
in the aggregate 25% of the value of its total assets.
 
    The Fund may invest up to 10% of its total assets in the purchase of put and
call options on securities and stock indexes, with a maximum of 5% of the Fund's
total  assets invested in stock index options. The Fund may purchase put options
on securities which it holds (or has the right to acquire) in its portfolio only
to protect itself against a decline in  the value of the security. The Fund  may
also purchase put options to close out written put positions. There are no other
limits on the Fund's ability to purchase call and put options. The Fund may also
purchase and write options on stock indexes. See
 
                                       7
<PAGE>
"Risks of Options on Indexes" in the Statement of Additional Information.
 
    The  Fund may also purchase  and sell interest rate  and stock index futures
contracts ("futures contracts") that are  traded on U.S. commodity exchanges  on
such  underlying securities  as U.S. Treasury  bonds, notes, and  bills and GNMA
Certificates ("interest rate" futures) and such indexes as the S&P 500 Index and
the New York  Stock Exchange  Composite Index  ("stock index"  futures) and  the
Moody's  Investment-Grade Corporate Bond Index  ("bond index" futures). The Fund
will purchase or  sell interest rate  futures contracts and  bond index  futures
contracts  for the purpose of hedging its fixed-income portfolio (or anticipated
portfolio) securities against  changes in  prevailing interest  rates. The  Fund
will  purchase or sell stock index futures  contracts for the purpose of hedging
its equity portfolio  (or anticipated portfolio)  securities against changes  in
their prices.
 
    The  Fund  also may  purchase  and write  call  and put  options  on futures
contracts and enter into  closing transactions with respect  to such options  to
terminate an existing position.
 
    RISKS  OF  OPTIONS AND  FUTURES  TRANSACTIONS. The  Fund  may close  out its
position as writer of an option, or as  a buyer or seller of a futures  contract
only  if a liquid  secondary market exists  for options or  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  options and  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."
 
    While the futures contracts and options transactions to be engaged in by the
Fund  for  the  purpose  of  hedging the  Fund's  portfolio  securities  are not
speculative in nature, there are risks inherent in the use of such  instruments.
One  such  risk  is  that  the Investment  Manager  could  be  incorrect  in its
expectations as to  the direction or  extent of various  interest rate or  price
movements  or the time span within which  the movements take place. For example,
if the Fund sold futures contracts for the sale of securities in anticipation of
an increase in interest rates, and  then interest rates went down, causing  bond
prices  to rise, the Fund would incur a loss on the sale. Another risk which may
arise in employing futures contracts to protect against the price volatility  of
portfolio  securities is  that the prices  of securities and  indexes subject to
futures contracts  (and  thereby the  futures  contracts prices)  may  correlate
imperfectly  with  the  behavior of  the  cash  prices of  the  Fund's portfolio
securities. See the Statement of  Additional Information for further  discussion
of such risks.
 
    New  futures  contracts, options  and other  financial products  and various
combinations thereof continue to be developed.  The Fund may invest in any  such
futures,  options or products as may be developed, to the extent consistent with
its investment objective and applicable regulatory requirements.
 
SPECIFIC INVESTMENT POLICIES
 
    The  Fund  has  adopted  the  following  specific  policies  which  are  not
fundamental  investment policies and which may be changed by the Fund's Board of
Directors:
 
        (1) At least 65% of the Fund's  total assets will be invested in  common
    stock  of  domestic and  foreign companies  in  the natural  resources areas
    described above. The  Fund may  also invest in  securities convertible  into
    common  stock and  may acquire warrants  and other rights  to acquire common
    stock in connection with purchases of portfolio securities.
 
        (2) The Fund may invest in securities of foreign companies. However, the
    Fund will not invest more than 10%  of its net assets in securities of  such
    issuers   (other  than  Canadian  issuers  on  which  there  is  no  limit).
    Investments in
 
                                       8
<PAGE>
    certain Canadian issuers may be  speculative due to certain political  risks
    and may be subject to substantial price fluctuations. The Fund's investments
    in  unlisted foreign securities are deemed  to be illiquid securities, which
    under the Fund's current investment policies may not in the aggregate amount
    to more than 15% of the Fund's total assets. Foreign securities  investments
    may   be  affected  by  changes  in   currency  rates  or  exchange  control
    regulations, changes in governmental administration or economic or  monetary
    policy  (in  the  United  States and  abroad)  or  changed  circumstances in
    dealings  between  nations.  Costs  may  be  incurred  in  connection   with
    conversions between various currencies held by the Fund.
 
        (3)  Up to 35% of  the value of the Fund's  total assets may be invested
    in: (a) common stock  of companies not in  the natural resources areas;  (b)
    investment  grade  corporate debt  securities when,  in  the opinion  of the
    Investment Manager, the projected total  return on such securities is  equal
    to  or greater than the expected total  return on equity securities, or when
    such holdings might be  expected to reduce the  volatility of the  portfolio
    (for  purposes  of  this  provision,  the  term  "total  return"  means  the
    difference between the cost  of a security and  the aggregate of its  market
    value  and dividends  received); (c) U.S.  Government securities (securities
    issued or guaranteed as  to principal and interest  by the United States  or
    its  agencies and  instrumentalities); and  (d) in  money market instruments
    under any one or more of the following circumstances: (i) pending investment
    of proceeds of sale of Fund shares or of portfolio securities; (ii)  pending
    settlement  of  purchases  of  portfolio securities;  or  (iii)  to maintain
    liquidity for the purpose of meeting anticipated redemptions.
 
        (4) Notwithstanding  any  of the  foregoing  limitations, the  Fund  may
    invest  more than  35% of  its total assets  in money  market instruments to
    maintain, temporarily, a  "defensive" posture  when, in the  opinion of  the
    Investment  Manager, it is advisable to do  so because of economic or market
    conditions.
 
    The foregoing limitations will apply at the time of acquisition based on the
last determined value  of the relevant  security or other  change in the  Fund's
assets.  Any  subsequent  change  in any  applicable  percentage  resulting from
fluctuations in value  will not  require elimination  of any  security from  the
portfolio.
 
PORTFOLIO MANAGEMENT
 
    The  Fund's portfolio is  actively managed by its  Investment Manager with a
view  to  achieving  the  Fund's  investment  objective.  In  determining  which
securities  to  purchase for  the  Fund or  hold  in the  Fund's  portfolio, the
Investment Manager  will rely  on information  from various  sources,  including
research,  analysis and appraisals of brokers and dealers, including Dean Witter
Reynolds Inc. ("DWR"), a broker-dealer affiliate of the Investment Manager,  the
views  of Trustees  of the Fund  and others regarding  economic developments and
interest rate trends; and  the Investment Manager's own  analysis of factors  it
deems  relevant.  No  particular  emphasis  will  be  given  to  investments  in
securities for the purpose of earning current income. The Fund is managed within
InterCapital's Growth Group, which manages 26 equity funds and fund  portfolios,
with  approximately  $10.1 billion  in assets  as of  February 29,  1996. Konrad
Krill, Vice President of InterCapital and a  member of the Growth Group, is  the
primary portfolio manager of the Fund. Mr. Krill has been a portfolio manager of
the  Fund since May,  1994 and has been  the sole portfolio  manager of the Fund
since April  1995. He  has been  a portfolio  manager or  investment analyst  at
InterCapital for over five years.
 
    Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect  principal transactions in certain money  market instruments with DWR. In
addition, the Fund  may incur  brokerage commissions  on transactions  conducted
through DWR.
 
                                       9
<PAGE>
    Although  the Fund  does not engage  in substantial short-term  trading as a
means of achieving its  investment objective, it  may sell portfolio  securities
without regard to the length of time they have been held, in accordance with the
investment policies described earlier. The Fund will incur underwriting discount
costs  (on underwritten  securities) and  brokerage costs  commensurate with its
portfolio turnover  rate. Short  term  gains and  losses  may result  from  such
portfolio  transactions.  See "Dividends,  Distributions and  Taxes" for  a full
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 Investment
Company Act of 1940,  as amended (the  "Act"), a fundamental  policy may not  be
changed  without the vote of a majority  of the outstanding voting securities of
the Fund, as defined in the Act. For purposes of the following limitations:  (i)
all  percentage  limitations  apply  immediately  after  a  purchase  or initial
investment;  and  (ii)  any  subsequent  change  in  any  applicable  percentage
resulting  from market fluctuations or other changes in total or net assets does
not require elimination of any security from the portfolio.
 
    The Fund may not:
 
        1.   Invest more  than  5% of  the  value of  its  total assets  in  the
    securities of any one issuer (other than obligations issued or guaranteed by
    the United States Government, its agencies or instrumentalities).
 
        2.   Purchase more than 10% of  all outstanding voting securities or any
    class of securities of any one issuer.
 
        3.  Invest more than 25% of the value of its total assets in  securities
    of  issuers in  any one  industry. This restriction  does not  apply to bank
    obligations or  obligations  issued  or  guaranteed  by  the  United  States
    Government or its agencies or instrumentalities.
 
        4.   Invest more than 5% of the  value of its total assets in securities
    of issuers having a record, together  with predecessors, of less than  three
    years  of  continuous operation.  This restriction  shall  not apply  to any
    obligation issued  or  guaranteed  by  the  United  States  Government,  its
    agencies or instrumentalities.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
    The  Fund offers its  shares for sale  to the public  on a continuous basis.
Pursuant  to  a  Distribution  Agreement  between  the  Fund  and  Dean   Witter
Distributors  Inc. (the "Distributor"), an  affiliate of the Investment Manager,
shares of the Fund  are distributed by  the Distributor and  offered by DWR  and
other  brokers and dealers who have entered into 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 minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may  be  made  by sending  a  check,  payable to  Dean  Witter  Natural Resource
Development  Securities  Inc.,  directly  to  Dean  Witter  Trust  Company  (the
"Transfer  Agent") at P.O. Box  1040, Jersey City, NJ  07303 or by contacting an
account executive of DWR  or other Selected  Broker-Dealer. The minimum  initial
purchase  in  the  case of  investments  through EasyInvest  -SM-,  an automatic
purchase plan (see "Shareholder Services"), is $100, provided that the  schedule
of  automatic investments will  result in investments  totalling at least $1,000
within the  first  twelve  months.  In  the  case  of  investments  pursuant  to
Systematic Payroll Deduction Plans (including
 
                                       10
<PAGE>
Individual   Retirement  Plans),  the  Fund,   in  its  discretion,  may  accept
investments without  regard to  any  minimum amounts  which would  otherwise  be
required  if the  Fund has  reason to  believe that  additional investments will
increase the investment  in each account  under such Plans  to at least  $1,000.
Certificates  for shares  purchased will not  be issued unless  requested by the
shareholder in writing to the Transfer Agent.
 
    Shares of  the Fund  are sold  through  the Distributor  on a  normal  three
business day settlement basis; that is, payment is due on the third business day
(settlement  date) after the order is placed with the Distributor. Shares of the
Fund purchased through the  Distributor are entitled  to dividends beginning  on
the  next business day  following settlement date. 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. Shares
purchased through the Transfer Agent are entitled to dividends beginning on  the
next  business day following receipt of an  order. As noted above, orders placed
directly with the Transfer Agent must be accompanied by payment.
 
    The offering price  will be the  net asset value  per share next  determined
following receipt of an order (see "Determination of Net Asset Value"). While no
sales  charge is imposed at the time shares are purchased, a contingent deferred
sales charge may  be imposed  at the time  of redemption  (see "Redemptions  and
Repurchases"). Sales personnel are compensated for selling shares of the Fund at
the  time of their sale by the  Distributor and/or Selected 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.
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted  a Plan of Distribution,  pursuant to Rule 12b-1  under
the Act (the "Plan"), under which the Fund will pay the Distributor a fee, which
is  accrued daily and payable  monthly, at an annual rate  of 1.0% of the lesser
of: (a) the average daily aggregate gross  sales of the Fund's shares since  the
Plan's  inception on July  2, 1984 (not including  reinvestments of dividends or
capital gains distributions), less the  average daily aggregate net asset  value
of the Fund's shares redeemed since the Plan's inception upon which a contingent
deferred  sales charge  has been  imposed or waived,  or (b)  the Fund's average
daily net assets. This fee is treated by  the Fund as an expense in the year  it
is accrued.
 
    Amounts paid under the Plan are 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, including the payment of commissions  for
sales  of the Fund's  shares and incentive  compensation to and  expenses of DWR
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  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 incurred.
 
    For the fiscal year ended February 29, 1996, the Fund accrued payments under
the  Plan amounting to $1,369,150, which amount  is equal to 0.97% of the Fund's
average daily net  assets for the  fiscal year. The  payments accrued under  the
Plan  were calculated pursuant  to clause (a) of  the compensation formula under
the Plan. A  portion of  the fee  payable pursuant to  the Plan,  which may  not
exceed  0.25% of  the Fund's  average daily  net assets,  is characterized  as a
service fee within the meaning of NASD guidelines. The service fee is a  payment
 
                                       11
<PAGE>
made for personal service and/or maintenance of shareholder accounts.
 
    At any given time, the Distributor may incur expenses in distributing 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 contingent deferred sales  charges
paid   by  investors  upon  the  redemption   of  shares  (see  "Redemption  and
Repurchases--Contingent Deferred Sales Charge"). For  example, if $1 million  in
expenses  in distributing 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  the excess
distribution expenses, including the  carrying charge described above,  totalled
$5,194,326  at February  29, 1996, which  was equal  to 3.40% of  the Fund's net
assets on such date.
 
    Because there  is no  requirement under  the Plan  that the  Distributor  be
reimbursed  for all expenses or any requirement  that the Plan be continued from
year to year, this excess  amount does not constitute  a liability of the  Fund.
Although  there is no legal obligation for  the Fund to pay expenses incurred in
excess of payments made to  the Distributor under the  Plan and the proceeds  of
contingent  deferred sales charges paid by  investors upon redemption of shares,
if for any reason  the Plan is  terminated the Directors  will consider at  that
time  the  manner  in which  to  treat  such expenses.  Any  cumulative expenses
incurred, but not yet recovered through distribution fees or contingent deferred
sales charges, may or may not  be recovered through future distribution fees  or
contingent deferred sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
    The  net asset value per share of the Fund is determined by taking the value
of all assets  of the  Fund, subtracting all  its liabilities,  dividing by  the
number  of shares outstanding and  adjusting to the nearest  cent. The net asset
value per share of the Fund is determined once daily at 4:00 p.m., New York time
(or, on days when the New York Stock Exchange closes prior to 4:00 p.m., at such
earlier time), on each  day that the  New York Stock Exchange  is open. 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 or quoted by  NASDAQ is valued at its  latest sale price on  that
exchange  or quotation service; if there were no sales that day, the security is
valued at the latest bid price (in cases where a security is traded on more than
one exchange, the security is valued  on the exchange designated as the  primary
market  pursuant  to procedures  adopted by  the Directors),  and (2)  all other
portfolio securities for  which over-the-counter market  quotations are  readily
available  are valued at  the latest bid  price. When market  quotations are not
readily available, including circumstances under  which it is determined by  the
Investment  Manager that sale and bid prices  are not reflective of a security's
market value, portfolio securities are valued at their fair value as  determined
in  good faith under procedures established by and under the general supervision
of the Fund's Directors.
 
    Short-term debt securities with remaining  maturities of sixty days or  less
are  valued  at amortized  cost  unless the  Directors  determine such  does not
reflect the securities'  market value, in  which case these  securities will  be
valued at their fair value as determined by the Directors.
 
    Certain  of  the Fund's  portfolio securities  may be  valued by  an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix  system incorporating  security  quality, maturity  and coupon  as  the
evaluation model parameters, and/or research evaluations by its staff, including
review  of broker-dealer market price quotations in determining what it believes
is the  fair  valuation of  the  portfolio  securities valued  by  such  pricing
service.
 
                                       12
<PAGE>
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    AUTOMATIC  INVESTMENT OF DIVIDENDS AND  DISTRIBUTIONS.  All income dividends
and capital gains distributions  are automatically paid  in full and  fractional
shares  of the  Fund (or  if specified  by the  shareholder, any  other open-end
investment  company  for  which   InterCapital  serves  as  Investment   Manager
(collectively,  with the Fund, the "Dean Witter Funds")), unless the shareholder
requests that they be paid  in cash. Shares so acquired  are not subject to  the
imposition  of a  contingent deferred  sales charge  upon their  redemption (see
"Redemptions and Repurchases").
 
    INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder
who  receives  a  cash  payment   representing  a  dividend  or  capital   gains
distribution may invest such dividend or distribution at the net asset value per
share next determined after receipt by the Transfer Agent by returning the check
or the proceeds to the Transfer Agent within thirty days after the payment date.
Shares  so acquired are not  subject to the imposition  of a contingent deferred
sales charge upon their redemption (see "Redemptions and Repurchases").
 
    EASYINVEST -SM-.   Shareholders may  subscribe to  EasyInvest, an  automatic
purchase  plan  which  provides  for  any  amount  from  $100  to  $5,000  to be
transferred automatically from a checking or savings account, 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 dollar amount,  not less than $25  or in any  whole
percentage  of  the  account balance,  on  an annualized  basis.  Any applicable
contingent deferred sales charge  will be imposed on  shares redeemed under  the
Withdrawal  Plan  (See "Redemptions  and Repurchases--Contingent  Deferred Sales
Charge"). 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 contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    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, eligible  Individual Retirement  Accounts  and
Custodial  Accounts  under  Section  403(b)(7)  of  the  Internal  Revenue Code.
Adoption of such plans should be on advice of legal counsel or tax adviser.
 
    For further information  regarding plan administration,  custodial fees  and
other  details, investors should contact their account executive or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
    The Fund  makes  available  to  its  shareholders  an  "Exchange  Privilege"
allowing  the exchange  of shares of  the Fund  for shares of  other Dean Witter
Funds sold  with a  contingent deferred  sales charge  ("CDSC funds"),  and  for
shares  of Dean Witter Short-Term U.S.  Treasury Trust, Dean Witter Limited Term
Municipal Trust, Dean Witter Intermediate Term U.S. Treasury Trust, Dean  Witter
Short-Term  Bond Fund,  Dean Witter Balanced  Income Fund,  Dean Witter Balanced
Growth Fund  and  five Dean  Witter  Funds which  are  money market  funds  (the
foregoing eleven non-CDSC funds are hereinafter collectively referred to in this
section  as the "Exchange Funds"). Exchanges may be made after the shares of the
Fund acquired by purchase (not by  exchange or dividend reinvestment) have  been
held for thirty days. There is no waiting period for
 
                                       13
<PAGE>
exchanges of shares acquired by exchange or dividend reinvestment.
 
    An  exchange to another CDSC  fund or any Exchange Fund  that is not a money
market fund is on the basis of the next calculated net asset value per share  of
each  fund after the  exchange order is  received. When exchanging  into a money
market fund from the Fund,  shares of the Fund are  redeemed out of the Fund  at
their  next calculated net  asset value and  the proceeds of  the redemption are
used to  purchase shares  of the  money market  fund at  their net  asset  value
determined  the following business day. Subsequent  exchanges between any of the
money market funds and any of the CDSC funds can be effected on the same  basis.
No  contingent deferred  sales charge  ("CDSC") is  imposed at  the time  of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different CDSC schedule  than that  of this  Fund will  be subject  to the  CDSC
schedule  of this  Fund, even if  such shares are  subsequently re-exchanged for
shares of the  CDSC fund  originally purchased. During  the period  of time  the
shareholder  remains in the Exchange  Fund (calculated from the  last day of the
month in which the shares were acquired), the holding period (for the purpose of
determining the rate of  the CDSC) is frozen.  If those shares are  subsequently
reexchanged for shares of a CDSC fund, the holding period previously frozen when
the first exchange was made resumes on the last day of the month in which shares
of a CDSC fund are reacquired. Thus, the CDSC is based upon the time (calculated
as  described above) the shareholder was invested  in shares of a CDSC fund (see
"Redemptions and Repurchases--Contingent  Deferred Sales  Charge"). However,  in
the  case of shares exchanged for shares  of an Exchange Fund, upon a redemption
of shares which results  in a CDSC  being imposed, a credit  (not to exceed  the
amount  of the CDSC) will be given in an amount equal to the Exchange Fund 12b-1
distribution fees incurred on or after that date which are attributable to those
shares. (Exchange Fund  12b-1 distribution fees,  if any, are  described in  the
prospectus for those funds.)
 
    In  addition, shares of the  Fund may be acquired  in exchange for shares of
Dean Witter Funds sold  with a front-end sales  charge ("front-end sales  charge
funds"),  but shares  of the  Fund, however acquired,  may not  be exchanged for
shares of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired  in
exchange  for shares of a front-end sales charge fund (or in exchange for shares
of other Dean Witter  Funds for which  shares of a  front-end sales charge  fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    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 may  be
exchanged,  upon  such  notice  as  may  be  required  by  applicable regulatory
agencies. Shareholders maintaining margin accounts with DWR or another  Selected
Broker-Dealer  are referred to their account executive regarding restrictions on
exchange of shares of the Fund pledged in the margin account.
 
                                       14
<PAGE>
    The current prospectus for each  fund describes its investment  objective(s)
and policies, and shareholders should obtain one and examine it carefully before
investing.  Exchanges are subject to the  minimum investment requirement and any
other conditions imposed by each fund. In the case of any shareholder holding  a
share  certificate or  certificates, no  exchanges may  be made  until the share
certificate(s) have been  received by the  Transfer Agent and  deposited in  the
shareholder's  account.  An  exchange will  be  treated for  federal  income tax
purposes the  same  as  a repurchase  or  redemption  of shares,  on  which  the
shareholder  may realize a capital gain or  loss. However, the ability to deduct
capital losses on an  exchange may be  limited in situations  where there is  an
exchange  of  shares within  ninety  days after  the  shares are  purchased. The
Exchange Privilege is only available in states where an exchange may legally  be
made.
 
    If  DWR or  another other  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  Dean
Witter  Funds (for which  the Exchange Privilege is  available) pursuant to this
Exchange Privilege  by  contacting their  DWR  or other  Selected  Broker-Dealer
account  executive (no Exchange Privilege Authorization Form is required). Other
shareholders (and those shareholders who are clients of DWR or another  Selected
Broker-Dealer  but who wish to make exchanges directly by writing or telephoning
the Transfer Agent) must complete and forward to the Transfer Agent an  Exchange
Privilege  Authorization Form, copies of which may be obtained from the Transfer
Agent, to initiate an exchange. If the Authorization Form is used, exchanges may
be made by contacting the Transfer Agent at (800) 869-NEWS (toll free).
 
    The  Fund  will  employ  reasonable  procedures  to  confirm  that  exchange
instructions  communicated  over  the  telephone  are  genuine.  Such procedures
include requiring various forms of personal identification such as name, mailing
address, social security  or other tax  identification number and  DWR or  other
Selected Broker-Dealer account number (if any). Telephone instructions will also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent  between 9:00 a.m.  and 4:00 p.m. New  York time, on any  day the New York
Stock Exchange is  open. Any  shareholder wishing to  make an  exchange who  has
previously  filed an Exchange Privilege Authorization  Form and who is unable to
reach the Fund  by telephone should  contact his  or her DWR  or other  Selected
Broker-Dealer  account  executive, if  appropriate, or  make a  written exchange
request. Shareholders are  advised that  during periods of  drastic economic  or
market  changes, it  is possible that  the telephone exchange  procedures may be
difficult to implement, although this has not been the case with the Dean Witter
Funds in the past.
 
    Shareholders should  contact  their  DWR  or  other  Selected  Broker-Dealer
account  executive  or  the Transfer  Agent  for further  information  about the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.  Shares of the Fund can be redeemed for cash at any time at  net
asset value per share next determined; however, such redemption proceeds will be
reduced  by the amount of any  applicable contingent deferred sales charges (see
below).  If  shares  are  held  in  a  shareholder's  account  without  a  stock
certificate, a written request for redemption to the Fund's Transfer Agent at P.
O.  Box 983, Jersey City, New Jersey 07303 is required. If certificates are held
by the shareholder, the shares may be redeemed by surrendering the  certificates
with  a written  request for  redemption along  with any  additional information
required by the Transfer Agent.
 
                                       15
<PAGE>
    CONTINGENT DEFERRED SALES CHARGE.  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 charge upon  redemption.
Shares redeemed sooner than six years after purchase may, however, be subject to
a  charge upon  redemption. This charge  is called a  "contingent deferred sales
charge" ("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 table below:
 
<TABLE>
<CAPTION>
                                     CONTINGENT DEFERRED
            YEAR SINCE                  SALES CHARGE
             PURCHASE                AS A PERCENTAGE OF
           PAYMENT MADE                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>
 
    A CDSC will not be imposed on:  (i) any amount which represents an  increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six 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 Dean Witter Funds sold with  a front-end sales charge or of other
Dean Witter Funds acquired in exchange for such shares. Morevoer, in determining
whether a CDSC is applicable it will  be assumed that amounts described in  (i),
(ii)  and (iii) above (in  that order) are redeemed  first. In addition, no CDSC
will be imposed on  redemptions of shares which  were purchased by certain  Unit
Investment  Trusts  (on  which  a  sales charge  has  been  paid)  or  which are
attributable to reinvestment of dividends or distributions from, or the proceeds
of, such Unit Investment Trusts.
 
    In addition, the CDSC, if otherwise  applicable, will be waived in the  case
of:
 
    (1)  redemptions of shares  held at the  time a shareholder  dies or becomes
disabled, only if  the shares  are:   (a) registered either  in the  name of  an
individual  shareholder (not a trust),  or in the names  of such shareholder and
his or her spouse as joint tenants with right of survivorship; or   (b) held  in
a  qualified corporate  or self-employed retirement  plan, Individual Retirement
Account ("IRA") or  Custodial Account  under Section 403(b)(7)  of the  Internal
Revenue  Code ("403(b)  Custodial Account"),  provided in  either case  that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2)  redemptions   in  connection   with  the   following  retirement   plan
distributions:   (a) lump-sum or other  distributions from a qualified corporate
or self-employed retirement plan following retirement (or, in the case of a "key
employee"   of   a   "top   heavy"    plan,   following   attainment   of    age
59  1/2);    distributions  from an  IRA or  403(b) Custodial  Account following
attainment of age 59 1/2; or    (C) a tax-free return of an excess  contribution
to an IRA; and
 
    (3)  all redemptions of  shares held for  the benefit of  a participant in a
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal  Revenue  Code  which  offers  investment  companies  managed  by   the
Investment  Manager or  its subsidiary,  Dean Witter  Services Company  Inc., as
self-directed investment alternatives and for  which Dean Witter Trust  Company,
an  affiliate  of  the Investment  Manager,  serves as  recordkeeper  or Trustee
("Eligible 401(k) Plan"), provided that either:  (a) the plan continues to be an
Eligible 401(k)  Plan after  the  redemption; or     (b)  the redemption  is  in
connection  with the complete termination of the plan involving the distribution
of all plan assets to participants.
 
    With reference to (1) above, for the purpose of determining disability,  the
Distributor  utilizes the definition of disability contained in Section 72(m)(7)
of the Internal Revenue Code, which relates to the
 
                                       16
<PAGE>
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.
 
    REPURCHASE.    DWR  and  other  Selected  Broker-Dealers  are  authorized to
repurchase shares represented by a stock  certificate which is delivered to  any
of  their  offices.  Shares held  in  a  shareholder's account  without  a stock
certificate may also  be repurchased  by DWR and  other Selected  Broker-Dealers
upon  the telephonic request of the shareholder. The repurchase price is the net
asset value 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,
the  Distributor, DWR  or other Selected  Broker-Dealers. The offers  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  thirty  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 at the net asset value next determined after  a
reinstatement request, together with proceeds, is received by the Transfer Agent
and  receive  a  pro rata  credit  for any  CDSC  paid in  connection  with such
redemption or repurchase.
 
    INVOLUNTARY REDEMPTION.  The Fund reserves  the right on sixty days'  notice
to  redeem at their net  asset value, the shares  of any shareholder (other than
shares held  in an  Individual  Retirement Account  or Custodial  Account  under
Section  403(b)(7) of the  Internal Revenue Code)  whose shares have  a value of
less than $100, or  such lesser amount as  may be fixed by  the Fund's Board  of
Directors  or, in  the case  of an account  opened through  EasyInvest, 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  intends to  pay dividends  and  to
distribute  substantially  all  of  the Fund's  net  investment  income  and net
short-term capital gains, if any, at least once each
 
                                       17
<PAGE>
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
Fund  shares (without  sales charge) and  will be automatically  credited to the
shareholder's account  without  issuance  of  a  stock  certificate  unless  the
shareholder  requests  in  writing that  all  dividends  be paid  in  cash. (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 of 1986, it is not expected  that the Fund will be required to pay
any federal income tax  on such income and  capital gains. Shareholders who  are
required  to pay taxes on their income  will normally have to pay Federal income
taxes, and any state  income taxes and/or local  income taxes, on the  dividends
and  distributions they receive from the Fund. Such dividends and distributions,
to the extent that they are derived from net investment income or net short-term
capital gains,  are  taxable to  the  shareholder as  ordinary  dividend  income
regardless  of whether the shareholder receives such distributions in additional
shares or in cash.
 
    As a regulated investment company, the  Fund is subject to the  requirements
that  less than 30%  of the Fund's gross  income be derived  from gains from the
sale or other disposition  of securities held for  less than three months.  This
requirement  may  limit the  Fund's  ability to  engage  in options  and futures
transactions.
 
    After the end  of the year,  shareholders will receive  full information  on
their dividends and capital gains distributions for tax purposes. To avoid being
subject  to a 31%  Federal backup withholding tax  on taxable dividends, capital
gains  distributions   and  the   proceeds  of   redemptions  and   repurchases,
shareholders' taxpayer identification numbers must be furnished and certified as
to their accuracy.
 
    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.
 
    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. 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 the
Fund of $1,000 over  periods of one,  five and ten  years. Average annual  total
return  reflects all income earned by the Fund, any appreciation or depreciation
of the Fund's assets, all  expenses incurred by the  Fund and all sales  charges
which  would be incurred  by redeeming 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  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 the  contingent deferred 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
 
                                       18
<PAGE>
shares of  the  Fund.  The  Fund  from time  to  time  may  also  advertise  its
performance  relative to  certain performance  rankings and  indexes compiled by
independent organizations (such  as mutual fund  performance rankings of  Lipper
Analytical Services, Inc.).
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
    VOTING  RIGHTS.   All shares of  common stock of  the Fund are  of $0.01 par
value and are equal as to earnings,  assets and voting privileges. There are  no
conversion,   pre-emptive  or  other  subscription   rights.  In  the  event  of
liquidation, each share of common stock of  the Fund is entitled to its  portion
of  all of the  Fund's assets after all  debts and expenses  have been paid. The
shares do not have cumulative voting rights.
 
    Under ordinary circumstances, the Fund is not required, nor does it  intend,
to hold Annual Meetings of Stockholders. The Directors may call Special Meetings
of  Stockholders for action by stockholder vote as may be required by the Act or
the Fund's By-Laws.
 
    CODE OF ETHICS.   Directors,  officers and employees  of InterCapital,  Dean
Witter Services Company Inc. and the Distributor are subject to a strict Code of
Ethics adopted by those companies. The Code of Ethics is intended to ensure that
the interests of shareholders and other clients are placed ahead of any personal
interest,  that no undue personal benefit is obtained from a person's employment
activities and that actual and potential  conflicts of interest are avoided.  To
achieve  these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an  advance clearance process to monitor that  no
Dean  Witter Fund is engaged at the same time  in a purchase or sale of the same
security. The  Code of  Ethics bans  the purchase  of securities  in an  initial
public offering, and also prohibits engaging in futures and options transactions
and  profiting on short-term  trading (that is,  a purchase within  60 days of a
sale or  a sale  within 60  days  of a  purchase) of  a security.  In  addition,
investment  personnel may  not purchase  or sell  a security  for their personal
account within 30 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.
 
    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.
 
                                       19
<PAGE>
 
   
Dean Witter
Natural Resource Development
Securities Inc.
                                    DEAN WITTER
Two World Trade Center
New York, New York 10048
BOARD OF DIRECTORS                  NATURAL RESOURCE
Michael Bozic                       DEVELOPMENT
Charles A. Fiumefreddo              SECURITIES
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Konrad Krill
Vice President
Thomas F. Caloia
Treasurer
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
TRANSFER AGENT AND DIVIDEND
DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
INVESTMENT MANAGER
Dean Witter InterCapital Inc.
 
4/23/96                                    PROSPECTUS -- APRIL 23, 1996
 
    
<PAGE>
 
STATEMENT OF ADDITIONAL INFORMATION       Dean Witter
APRIL 23, 1996                            Natural Resource
                                          Development
                                          Securities
 
- --------------------------------------------------------------------------------
 
    Dean  Witter Natural Resource Development Securities Inc. (the "Fund") is an
open-end diversified management investment company whose investment objective is
capital growth. The Fund invests primarily  in common stock of companies in  the
natural  resources  and  related  areas,  including  companies  engaged  in  the
exploration  for  and  development,  production  and  distribution  of   natural
resources  or  in  the  development of  energy-efficient  technologies  or other
natural resource related  supplies or products.  (See "Investment Practices  and
Policies.")
 
    A  Prospectus for the  Fund dated April  23, 1996, which  provides the basic
information you  should know  before  investing in  the  Fund, may  be  obtained
without charge from the Fund at the address or telephone numbers listed below or
from  the Fund's Distributor, Dean Witter Distributors Inc., or from Dean Witter
Reynolds Inc.,  at any  of  its branch  offices.  This Statement  of  Additional
Information is not a Prospectus. It contains information in addition to and more
detailed  than  that set  forth in  the  Prospectus. It  is intended  to provide
additional information regarding the activities and operations of the Fund,  and
should be read in conjunction with the Prospectus.
 
Dean Witter
Natural Resource Development
  Securities Inc.
Two World Trade Center
New York, New York 10048
(212) 392-2550 or
(800) 869-NEWS (toll-free)
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                           <C>
The Fund and its Management.................................................................          3
Directors and Officers......................................................................          6
Investment Practices and Policies...........................................................         11
Investment Restrictions.....................................................................         22
Portfolio Transactions and Brokerage........................................................         24
The Distributor.............................................................................         25
Shareholder Services........................................................................         29
Redemptions and Repurchases.................................................................         33
Dividends, Distributions and Taxes..........................................................         35
Performance Information.....................................................................         36
Shares of the Fund..........................................................................         37
Custodian and Transfer Agent................................................................         37
Independent Accountants.....................................................................         38
Reports to Shareholders.....................................................................         38
Legal Counsel...............................................................................         38
Experts.....................................................................................         38
Registration Statement......................................................................         38
Report of Independent Accountants...........................................................         39
Financial Statements--February 29, 1996.....................................................         40
</TABLE>
 
                                       2
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
THE FUND
 
    The  Fund was  incorporated in  the State of  Maryland on  December 22, 1980
under the  name InterCapital  Natural Resource  Development Securities  Inc.  On
March  16, 1983 the  Fund's shareholders approved  a change in  the Fund's name,
effective March 21, 1983, to Dean Witter Natural Resource Development Securities
Inc.
 
THE INVESTMENT MANAGER
 
    Dean Witter InterCapital Inc. (the "Investment Manager" or  "InterCapital"),
a  Delaware corporation, whose address is Two  World Trade Center, New York, New
York 10048, is  the Fund's  Investment Manager. InterCapital  is a  wholly-owned
subsidiary  of Dean Witter, Discover &  Co. ("DWDC"), a Delaware corporation. In
an internal  reorganization  which took  place  in January,  1993,  InterCapital
assumed  the  investment  advisory,  administrative  and  management  activities
previously performed by the InterCapital  Division of Dean Witter Reynolds  Inc.
("DWR"), a broker-dealer affiliate of InterCapital. (As hereinafter used in this
Statement  of Additional  Information, the terms  "InterCapital" and "Investment
Manager"  refer  to   DWR's  InterCapital   Division  prior   to  the   internal
reorganization  and  to Dean  Witter  InterCapital Inc.  thereafter.)  The daily
management of  the  Fund  and  research relating  to  the  Fund's  portfolio  is
conducted  by  or  under  the direction  of  officers  of the  Fund  and  of the
Investment Manager, subject  to review  of investments  by the  Fund's Board  of
Directors.  In  addition, Directors  of the  Fund  provide guidance  on economic
factors and interest rate trends. Information as to these Directors and Officers
is contained under the caption "Directors and Officers."
 
    InterCapital is also  the investment  manager or investment  adviser of  the
following investment companies: Dean Witter Liquid Asset Fund Inc., InterCapital
Income  Securities Inc., InterCapital Insured Municipal Bond Trust, InterCapital
Insured Municipal Trust,  Dean Witter  High Yield Securities  Inc., Dean  Witter
Tax-Free  Daily Income  Trust, Dean  Witter Developing  Growth Securities Trust,
Dean Witter Tax-Exempt Securities Trust, Dean Witter Dividend Growth  Securities
Inc.,  Dean Witter American Value Fund, Dean Witter U.S. Government Money Market
Trust, Dean Witter Variable Investment Series, Dean Witter World Wide Investment
Trust,  Dean  Witter  Select  Municipal  Reinvestment  Fund,  Dean  Witter  U.S.
Government  Securities Trust, Dean Witter  California Tax-Free Income Fund, Dean
Witter New York Tax-Free Income Fund, Dean Witter Convertible Securities  Trust,
Dean  Witter Federal  Securities Trust,  Dean Witter  Value-Added Market Series,
High Income  Advantage  Trust,  High  Income Advantage  Trust  II,  High  Income
Advantage  Trust III, Dean Witter Government Income Trust, Dean Witter Utilities
Fund, Dean Witter Managed  Assets Trust, Dean  Witter California Tax-Free  Daily
Income  Trust, Dean Witter Strategist Fund, Dean Witter World Wide Income Trust,
Dean Witter Intermediate Income Securities, Dean Witter New York Municipal Money
Market Trust, Dean Witter Capital Growth Securities, Dean Witter European Growth
Fund Inc., Dean Witter  Precious Metals and Minerals  Trust, Dean Witter  Global
Short-Term  Income Fund Inc., Dean Witter  Pacific Growth Fund Inc., Dean Witter
Multi-State Municipal Series Trust, Dean Witter Short-Term U.S. Treasury  Trust,
Dean  Witter  Diversified  Income  Trust,  Dean  Witter  Premier  Income  Trust,
InterCapital Quality Municipal Investment Trust, InterCapital Quality  Municipal
Income  Trust, Dean Witter Retirement Series, Dean Witter Health Sciences Trust,
InterCapital Insured  Municipal Income  Trust, InterCapital  California  Insured
Municipal  Income  Trust, Dean  Witter Global  Dividend Growth  Securities, Dean
Witter  Limited  Term  Municipal  Trust,  Dean  Witter  Short-Term  Bond   Fund,
InterCapital  Quality  Municipal  Securities,  InterCapital  California  Quality
Municipal  Securities,  InterCapital  New  York  Quality  Municipal  Securities,
InterCapital  Insured  Municipal  Securities,  InterCapital  Insured  California
Municipal Securities, Dean  Witter Global Utilities  Fund, Dean Witter  National
Municipal  Trust, Dean Witter High  Income Securities, Dean Witter International
SmallCap Fund, Dean Witter  Mid-Cap Growth Fund,  Dean Witter Select  Dimensions
Series,  Dean Witter Global  Asset Allocation Fund,  Dean Witter Balanced Income
Fund, Dean Witter Balanced Growth Fund, Dean Witter Hawaii Municipal Trust, Dean
Witter Capital  Appreciation Fund,  Dean Witter  Information Fund,  Dean  Witter
Intermediate  Term U.S.  Treasury Trust, Dean  Witter Japan  Fund, Active Assets
Money Trust, Active  Assets Tax-Free  Trust, Active  Assets California  Tax-Free
Trust,  Active  Assets  Government  Securities  Trust,  Municipal  Income Trust,
Municipal  Income  Trust  II,  Municipal  Income  Trust  III,  Municipal  Income
Opportunities  Trust, Municipal Income Opportunities  Trust II, Municipal Income
Opportunities Trust III, Prime Income Trust and Municipal Premium Income  Trust.
The  foregoing investment  companies, together  with the  Fund, are collectively
referred to  as  the  Dean  Witter Funds.  In  addition,  Dean  Witter  Services
 
                                       3
<PAGE>
Company  Inc.  ("DWSC"), a  wholly-owned subsidiary  of InterCapital,  serves as
manager for the following investment  companies, for which TCW Funds  Management
Inc.  is the investment adviser: TCW/DW Core Equity Trust, TCW/DW North American
Government Income Trust, TCW/DW  Latin American Growth  Fund, TCW/DW Income  and
Growth  Fund, TCW/DW Small  Cap Growth Fund, TCW/DW  Balanced Fund, TCW/DW Total
Return Trust, TCW/DW Mid-Cap Equity Trust,  TCW/DW Term Trust 2000, TCW/DW  Term
Trust  2002, TCW/DW  Term Trust 2003  and TCW/DW  Emerging Markets Opportunities
Trust (the  "TCW/DW Funds").  InterCapital  also serves  as (i)  sub-advisor  to
Templeton  Global  Opportunities  Trust, an  open-end  investment  company; (ii)
administrator of  The  Black  Rock  Strategic  Term  Trust  Inc.,  a  closed-end
investment  company; and  (iii) sub-administrator  of Mass  Mutual Participation
Investors and Templeton Global  Governments Income Trust, closed-end  investment
companies.
 
    The  Investment Manager also serves as an investment adviser for Dean Witter
World Wide Investment Fund,  an investment company organized  under the laws  of
Luxembourg,  shares of which are not available for purchase in the United States
or by American citizens outside the United States.
 
    Pursuant to an  Investment Management Agreement  (the "Agreement") with  the
Investment  Manager, the Fund has retained  the Investment Manager to manage the
investment of  the  Fund's assets,  including  the  placing of  orders  for  the
purchase  and sale of  portfolio securities. The  Investment Manager obtains and
evaluates such  information  and  advice relating  to  the  economy,  securities
markets,  and  specific  securities  as  it  considers  necessary  or  useful to
continuously manage  the assets  of the  Fund in  a manner  consistent with  its
investment objective and policies.
 
    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, such  office  space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including the preparation  of
prospectuses, proxy statements and reports required to be filed with federal and
state  securities commissions (except insofar as the participation or assistance
of independent accountants and  attorneys is, in the  opinion of the  Investment
Manager,  necessary or desirable). In addition,  the Investment Manager 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
service, heat, light, power and other utilities provided to the Fund.
 
    Effective December  31,  1993,  pursuant to  a  Services  Agreement  between
InterCapital  and DWSC, DWSC began to provide the administrative services to the
Fund which  were previously  performed directly  by InterCapital.  On April  17,
1995,  DWSC was  reorganized in the  State of Delaware,  necessitating the entry
into a new Services  Agreement between InterCapital and  DWSC on that date.  The
foregoing  internal reorganization did not result in any change in the nature or
scope of the administrative services  being provided to the  Fund or any of  the
fees  being paid by the Fund for  the overall services being performed under the
terms of the existing Agreement.
 
    Expenses not expressly assumed by the Investment Manager under the Agreement
or by  the  Distributor of  the  Fund's  shares Dean  Witter  Distributors  Inc.
("Distributors"  or the "Distributor")  (see "The Distributor")  will be paid by
the Fund.  The expenses  borne by  the Fund  include, but  are not  limited  to:
expenses  of  the  Plan  of  Distribution  pursuant  to  Rule  12b-1  (see  "The
Distributor"); charges and expenses of any registrar, custodian, stock  transfer
and  dividend  disbursing  agent; brokerage  commissions;  taxes;  engraving and
printing stock certificates; registration costs of the Fund and its shares under
federal and state securities laws; the  cost and expense of printing,  including
typesetting,   and  distributing  Prospectuses   and  Statements  of  Additional
Information of the Fund and supplements thereto to the Fund's shareholders;  all
expenses of shareholders' and Directors' meetings and of preparing, printing and
mailing  of  proxy  statements  and reports  to  shareholders;  fees  and travel
expenses of Directors or members of any advisory board or committee who are  not
employees of the Investment Manager or any corporate affiliate of the Investment
Manager;  all  expenses  incident  to  any  dividend,  withdrawal  or redemption
options; charges and  expenses of any  outside service used  for pricing of  the
Fund's  shares; fees  and expenses  of legal  counsel, including  counsel to the
Directors who  are not  interested persons  of  the Fund  or of  the  Investment
Manager  (not including compensation or expenses  of attorneys who are employees
of the  Investment  Manager) and  independent  accountants; membership  dues  of
industry  associations; interest on Fund borrowings; postage; insurance premiums
on
 
                                       4
<PAGE>
property or personnel (including officers and Directors) of the Fund which inure
to its benefit;  extraordinary expenses  (including, but not  limited to,  legal
claims  and liabilities  and litigation  costs and  any indemnification relating
thereto); and all other costs of the Fund's operation.
 
    As full compensation for the services  and facilities furnished to the  Fund
and  expenses of the Fund  assumed by the Investment  Manager, the Fund pays the
Investment  Manager  monthly  compensation  calculated  daily  by  applying  the
following  annual rates to the net assets of the Fund determined as of the close
of each  business  day: 0.625%  of  the portion  of  the daily  net  assets  not
exceeding  $250  million  and 0.50%  of  the  portion of  the  daily  net assets
exceeding $250 million. For the fiscal  years ended February 28, 1994,  February
28, 1995 and February 29, 1996, the Fund accrued to the Investment Manager total
compensation  under  the  Agreement in  the  amounts of  $819,273,  $886,340 and
$883,804, respectively.
 
    Pursuant to the Agreement, total operating expenses of the Fund are  subject
to  applicable limitations under rules and  regulations of states where the Fund
is authorized to sell its shares. Therefore, operating expenses are  effectively
subject  to the most restrictive of such  limitations as the same may be amended
from time to time. Presently, the most restrictive limitation is as follows. If,
in any fiscal  year, the Fund's  total operating expenses,  exclusive of  taxes,
interest,  brokerage fees, distribution fees  and extraordinary expenses (to the
extent permitted by  applicable state securities  laws and regulations),  exceed
2  1/2% of  the first $30,000,000  of average daily  net assets, 2%  of the next
$70,000,000 of  average  daily  net  assets  and  1  1/2%  of  any  excess  over
$100,000,000,  the Investment Manager will reimburse  the Fund for the amount of
such excess. Such amount,  if any, will  be calculated daily  and credited on  a
monthly  basis. During  the fiscal years  ended February 28,  1994, February 28,
1995 and February 29, 1996, the  Fund's expenses did not exceed the  limitations
set forth above.
 
    The  Agreement  provides that  in the  absence  of willful  misfeasance, bad
faith, gross negligence or reckless disregard of its obligations thereunder, the
Investment Manager is not liable to the Fund or any of its investors for any act
or omission by the Investment Manager or for any losses sustained by the Fund or
its investors. The  Agreement in no  way restricts the  Investment Manager  from
acting as investment manager or adviser to others.
 
    The  Agreement was initially  approved by the Directors  on October 30, 1992
and by the Shareholders at  a Meeting of Shareholders  on January 12, 1993.  The
Agreement  is substantially identical to a prior investment management agreement
which was initially approved by the Board  of Directors on January 18, 1983  and
by  the shareholders on  March 16, 1983.  The Agreement took  effect on June 30,
1993 upon the spin-off by Sears, Roebuck & Co. of its remaining shares of  DWDC.
The  Agreement may be terminated  at any time, without  penalty, on thirty days'
notice by the Board of Directors of the  Fund, by the holders of a majority,  as
defined  in the Investment Company  Act of 1940, as  amended (the "Act"), of the
outstanding shares of the Fund, or by the Investment Manager. The Agreement will
automatically terminate in the event of its assignment (as defined in the Act).
 
    Under its terms, the Agreement had an initial term ending April 30, 1994 and
provides  that  it  will  continue  from  year  to  year  thereafter,   provided
continuance  of the Agreement is  approved at least annually  by the vote of the
holders of a majority, as defined in  the Act, of the outstanding shares of  the
Fund,  or by the Board  of Directors of the Fund;  provided that in either event
such continuance is approved annually by the vote of a majority of the Directors
of the Fund who  are not parties  to the Agreement  or "interested persons"  (as
defined  in the Act) of any  such party, which vote must  be cast in person at a
meeting called for the purpose of  voting on such approval. The continuation  of
the  Agreement until April 30, 1997, was  approved by the Directors of the Fund,
including a majority  of the  Independent Directors,  at their  meeting held  on
April 17, 1996.
 
    The Fund has acknowledged that the name "Dean Witter" is a property right of
DWR.  The Fund has agreed that the DWR or  its parent company may use or, at any
time, permit others to  use, the name  "Dean Witter." The  Fund has also  agreed
that  in the event  the Agreement is  terminated, or if  the affiliation between
InterCapital and/or DWR  and its  parent company  is terminated,  the Fund  will
eliminate  the name "Dean Witter"  from its name if  InterCapital and/or DWR its
parent company shall so request.
 
                                       5
<PAGE>
DIRECTORS AND OFFICERS
- --------------------------------------------------------------------------------
 
    The Directors and Executive Officers  of the Fund, their principal  business
occupations  during the  last five  years and  their affiliations,  if any, with
InterCapital and with the 80 Dean Witter Funds and the 12 TCW/DW Funds are shown
below.
 
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND
               AND ADDRESS                                 PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- -----------------------------------------  -----------------------------------------------------------------------------
 
<S>                                        <C>
Michael Bozic (55)                         Chairman and Chief Executive Officer  of Levitz Furniture Corporation  (since
Director                                   November,  1995);  Director or  Trustee of  the  Dean Witter  Funds; formerly
c/o Levitz Furniture Corporation           President and Chief Executive Officer of Hills Department Stores (since  May,
6111 Broken Sound Parkway, N.W.            1991);  formerly Chairman and Chief  Executive Officer (January, 1987-August,
Boca Raton, Florida                        1990) and President and Chief Operating Officer (August, 1990-February, 1991)
                                           of the  Sears  Merchandise Group  of  Sears,  Roebuck and  Co.;  Director  of
                                           Eaglemark  Financial Services, Inc.,  the United Negro  College Fund, Weirton
                                           Steel Corporation and Domain Inc. (home decor retailer).
 
Charles A. Fiumefreddo* (62)               Chairman, Chief Executive Officer and  Director of InterCapital, Dean  Witter
Chairman, Director,                        Distributors  Inc. ("Distributors")  and DWSC;  Executive Vice  President and
President and Chief                        Director of DWR; Chairman, Trustee or Director, President and Chief Executive
Executive Officer                          Officer of  the Dean  Witter  Funds; Chairman,  Chief Executive  Officer  and
Two World Trade Center                     Trustee  of the TCW/DW Funds; formerly  Executive Vice President and Director
New York, New York                         of DWDC (until February,  1993); Chairman and Director  of Dean Witter  Trust
                                           Company  ("DWTC") (since October,  1989); Director and/or  officer of various
                                           DWDC subsidiaries.
 
Edwin J. Garn (63)                         Director or Trustee of the Dean Witter Funds; formerly United States  Senator
Director                                   (R-Utah)  (1974-1992)  and  Chairman, Senate  Banking  Committee (1980-1986);
c/o Huntsman Chemical Corporation          formerly Mayor of Salt Lake City, Utah (1971-1974); formerly Astronaut, Space
500 Huntsman Way                           Shuttle Discovery  (April  12-19,  1985); Vice  Chairman,  Huntsman  Chemical
Salt Lake City, Utah                       Corporation   (since  January,  1993);  Director   of  Franklin  Quest  (time
                                           management systems) and John  Alden Financial Corp.; member  of the board  of
                                           various civic and charitable organizations.
 
John R. Haire (71)                         Chairman  of  the  Audit  Committee  and Chairman  of  the  Committee  of the
Director                                   Independent Directors or Trustees and Director or Trustee of the Dean  Witter
Two World Trade Center                     Funds;  Trustee of the  TCW/DW Funds; formerly President,  Council for Aid to
New York, New York                         Education (1978-1989) and  formerly Chairman and  Chief Executive Officer  of
                                           Anchor Corporation, an Investment Adviser (1964-1978); Director of Washington
                                           National Corporation (insurance).
 
Dr. Manuel H. Johnson (47)                 Senior  Partner, Johnson Smick  International, Inc., a  consulting firm; Koch
Director                                   Professor of International Economics  and Director of  the Center for  Global
c/o Johnson Smick International, Inc.      Market  Studies at George Mason University;  Co-Chairman and a founder of the
1133 Connecticut Avenue, N.W.              Group of Seven Council (G7C), an international economic commission;  Director
Washington, D.C.                           or Trustee of the Dean Witter Funds; Trustee of the TCW/DW Funds; Director of
                                           NASDAQ  (since  June,  1995);  Director  of  Greenwich  Capital  Markets Inc.
                                           (broker-dealer); formerly  Vice Chairman  of the  Board of  Governors of  the
                                           Federal  Reserve  System  (1986-1990)  and Assistant  Secretary  of  the U.S.
                                           Treasury (1982-1986).
</TABLE>
 
                                       6
<PAGE>
 
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND
               AND ADDRESS                                 PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- -----------------------------------------  -----------------------------------------------------------------------------
 
<S>                                        <C>
Paul Kolton (72)                           Director or Trustee of the Dean Witter Funds; Chairman of the Audit Committee
Director                                   and Chairman of  the Committee  of Independent  Trustees and  Trustee of  the
c/o Gordon Altman Butowsky                 TCW/DW  Funds;  formerly  Chairman  of  the  Financial  Accounting  Standards
Weitzen Shalov & Wein                      Advisory Council and  Chairman and  Chief Executive Officer  of the  American
Counsel to the Independent Directors       Stock  Exchange; Director  of UCC  Investors Holding  Inc. (Uniroyal Chemical
114 West 47th Street                       Company, Inc.); director or trustee of various not-for-profit organizations.
New York, New York
 
Michael E. Nugent (59)                     General Partner,  Triumph Capital,  L.P., a  private investment  partnership;
Director                                   Director  or Trustee of the  Dean Witter Funds; Trustee  of the TCW/DW Funds;
c/o Triumph Capital, L.P.                  formerly Vice President,  Bankers Trust  Company and  BT Capital  Corporation
237 Park Avenue                            (September, 1984-March, 1988); Director of various business organizations.
New York, New York
 
Philip J. Purcell* (52)                    Chairman  of the Board of Directors and  Chief Executive Officer of DWDC, DWR
Director                                   and  Novus  Credit  Services  Inc.;   Director  of  InterCapital,  DWSC   and
Two World Trade Center                     Distributors;  Director or Trustee of the  Dean Witter Funds; Director and/or
New York, New York                         officer of various DWDC subsidiaries.
 
John L. Schroeder (65)                     Retired; Director or Trustee of the  Dean Witter Funds; Director of  Citizens
Director                                   Utilities  Company; formerly  Executive Vice  President and  Chief Investment
c/o Gordon Altman Butowsky                 Officer of the Home Insurance  Company (since August, 1991-September,  1995);
Weitzen Shalov & Wein                      formerly Chairman and Chief Investment Officer of Axe-Houghton Management and
Counsel to the Independent Trustees        the Axe- Houghton Funds and President of USF&G Financial Services, Inc. (June
114 West 47th Street                       1990-June, 1991).
New York, New York
 
Sheldon Curtis (64)                        Senior  Vice  President, Secretary  and General  Counsel of  InterCapital and
Vice President, Secretary                  DWSC; Senior  Vice President  and Secretary  of DWTC  (since October,  1989);
and General Counsel                        Senior  Vice President, Assistant Secretary  and Assistant General Counsel of
Two World Trade Center                     Distributors; Assistant  Secretary  of  DWR; Vice  President,  Secretary  and
New York, New York                         General Counsel of the Dean Witter Funds and the TCW/DW Funds.
 
Konrad Krill (36)                          Vice  President  of  InterCapital  (since  1991);  previously  Assistant Vice
Vice President                             President and Portfolio Manager of InterCapital (May, 1986-1991).
Two World Trade Center
New York, New York
 
Thomas F. Caloia (50)                      First Vice  President  (since  May,  1991)  and  Assistant  Treasurer  (since
Treasurer                                  January,  1993) of InterCapital; First Vice President and Assistant Treasurer
Two World Trade Center                     of DWSC  and  Treasurer  of the  Dean  Witter  Funds and  the  TCW/DW  Funds;
New York, New York                         previously Vice President of InterCapital.
<FN>
- ------------------------
*Denotes Directors who are "interested persons" of the Fund, as defined in the
Act.
</TABLE>
 
    In  addition,  Robert  M.  Scanlan,  President  of  InterCapital  and  Chief
Operating  Officer  of  InterCapital  and  DWSC,  Executive  Vice  President  of
Distributors  and DWTC  and Director  of DWTC,  David A.  Hughey, Executive Vice
President and Chief Administrative  Officer of InterCapital, DWSC,  Distributors
and  DWTC and Director  of DWTC, Robert  S. Giambrone, Senior  Vice President of
InterCapital, DWSC, Distributors  and DWTC and  Director of DWTC  and Joseph  J.
McAlinden,  Executive  Vice President  of InterCapital,  and Paul  Vance, Senior
 
                                       7
<PAGE>
Vice President of InterCapital,  and Ira Ross,  Vice President of  InterCapital,
are Vice Presidents of the Fund. In addition, Marilyn K. Cranney and Barry Fink,
First  Vice Presidents and  Assistant General Counsels  of InterCapital and DWSC
and LouAnne D.  McInnis and Ruth  Rossi, Vice Presidents  and Assistant  General
Counsels  of  InterCapital and  DWSC, and  Carsten Otto,  a staff  attorney with
InterCapital, are Assistant Secretaries of the Fund.
 
THE BOARD OF DIRECTORS, THE INDEPENDENT DIRECTORS, AND THE COMMITTEES
 
    The Board of Trustees consists of nine (9) directors. These same individuals
also serve as directors or  trustees for all of the  Dean Witter Funds, and  are
referred  to in this section  as Directors. As of the  date of this Statement of
Additional Information, there are a total of 80 Dean Witter Funds, comprised  of
120  portfolios. As of  February 29, 1996,  the Dean Witter  Funds had total net
assets of approximately $74.3 billion and more than five million shareholders.
 
    Seven Directors (77% of  the total number) have  no affiliation or  business
connection with InterCapital or any of its affiliated persons and do not own any
stock  or other securities issued by  InterCapital's parent company, DWDC. These
are the "disinterested" or "independent" Directors. The other two Directors (the
"management Directors")  are affiliated  with InterCapital.  Five of  the  seven
independent Directors are also Independent Trustees of the TCW/DW Funds.
 
    Law and regulation establish both general guidelines and specific duties for
the  Independent Directors. The Dean Witter  Funds seek as Independent Directors
individuals of distinction  and experience in  business and finance,  government
service  or academia; these are people whose advice and counsel are in demand by
others and for  whom there is  often competition.  To accept a  position on  the
Funds'  Boards, such individuals may reject other attractive assignments because
the Funds make  substantial demands  on their time.  Indeed, by  serving on  the
Funds'  Boards, certain Directors who would otherwise be qualified and in demand
to serve on bank boards would be prohibited by law from doing so.
 
    All of the Independent Directors serve as members of the Audit Committee and
the Committee of the Independent Directors. Three of them also serve as  members
of  the Derivatives Committee. During the calendar year ended December 31, 1995,
the three Committees held a combined  total of fifteen meetings. The  Committees
hold  some  meetings at  InterCapital's offices  and some  outside InterCapital.
Management Directors or officers  do not attend these  meetings unless they  are
invited for purposes of furnishing information or making a report.
 
    The  Committee of the Independent Directors  is charged with recommending to
the full Board  approval of management,  advisory and administration  contracts,
Rule  12b-1  plans  and distribution  and  underwriting  agreements; continually
reviewing Fund performance;  checking on  the pricing  of portfolio  securities,
brokerage  commissions, transfer agent costs  and performance, and trading among
Funds in the  same complex; and  approving fidelity bond  and related  insurance
coverage and allocations, as well as other matters that arise from time to time.
The  Independent Directors  are required to  select and  nominate individuals to
fill any Independent Director vacancy on the  Board of any Fund that has a  Rule
12b-1 plan of distribution. Most of the Dean Witter Funds have such a plan.
 
    The  Audit  Committee is  charged with  recommending to  the full  Board the
engagement  or  discharge  of  the  Fund's  independent  accountants;  directing
investigations  into matters  within the  scope of  the independent accountants'
duties, including the power  to retain outside  specialists; reviewing with  the
independent  accountants the audit plan and  results of the auditing engagement;
approving professional  services provided  by  the independent  accountants  and
other  accounting firms prior to the performance of such services; reviewing the
independence of the independent accountants; considering the range of audit  and
non-audit  fees;  reviewing  the  adequacy  of  the  Fund's  system  of internal
controls; and preparing  and submitting  Committee meeting minutes  to the  full
Board.
 
    Finally,  the  Board of  each  Fund has  formed  a Derivatives  Committee to
establish parameters for and oversee the activities of the Fund with respect  to
derivative investments, if any, made by the Fund.
 
                                       8
<PAGE>
DUTIES OF CHAIRMAN OF COMMITTEES
 
    The   Chairman  of  the  Committees  maintains   an  office  at  the  Funds'
headquarters in New York.  He is responsible for  keeping abreast of  regulatory
and  industry developments and the Funds'  operations and management. He screens
and/or prepares  written  materials  and  identifies  critical  issues  for  the
Independent  Directors  to consider,  develops  agendas for  Committee meetings,
determines the type and amount of  information that the Committees will need  to
form  a  judgment  on various  issues,  and  arranges to  have  that information
furnished to Committee members. He also arranges for the services of independent
experts and consults with them in advance of meetings to help refine reports and
to focus on critical issues. Members  of the Committees believe that the  person
who  serves as  Chairman of  all three  Committees and  guides their  efforts is
pivotal to the effective functioning of the Committees.
 
    The Chairman of the  Committees also maintains  continuous contact with  the
Funds'  management, with  independent counsel  to the  Independent Directors and
with the  Funds' independent  auditors.  He arranges  for  a series  of  special
meetings  involving  the annual  review of  investment advisory,  management and
other operating  contracts  of the  Funds  and,  on behalf  of  the  Committees,
conducts  negotiations with the Investment  Manager and other service providers.
In effect,  the Chairman  of the  Committees serves  as a  combination of  chief
executive and support staff of the Independent Directors.
 
    The Chairman of the Committees is not employed by any other organization and
devotes his time primarily to the services he performs as Committee Chairman and
Independent  Director of the Dean Witter Funds  and as an Independent Trustee of
the TCW/DW Funds.  The current  Committee Chairman has  had more  than 35  years
experience as a senior executive in the investment company industry.
 
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL DEAN
WITTER FUNDS
 
    The  Independent Directors and the Funds' management believe that having the
same Independent  Directors  for  each  of the  Dean  Witter  Funds  avoids  the
duplication  of  effort  that  would  arise  from  having  different  groups  of
individuals serving as Independent  Directors for each of  the Funds or even  of
sub-groups  of Funds.  They believe  that having  the same  individuals serve as
Independent Directors of  all the Funds  tends to increase  their knowledge  and
expertise regarding matters which affect the Fund complex generally and enhances
their  ability  to negotiate  on behalf  of  each Fund  with the  Fund's service
providers. This arrangement also precludes the possibility of separate groups of
Independent Directors arriving at conflicting decisions regarding operations and
management of the  Funds and  avoids the cost  and confusion  that would  likely
ensue.  Finally, having the same Independent  Directors serve on all Fund Boards
enhances the ability of  each Fund to  obtain, at modest  cost to each  separate
Fund, the services of Independent Directors, and a Chairman of their Committees,
of  the caliber, experience and business acumen  of the individuals who serve as
Independent Directors of the Dean Witter Funds.
 
COMPENSATION OF INDEPENDENT DIRECTORS
 
    The Fund pays  each Independent  Director an  annual fee  of $1,000  ($1,200
prior  to September 30, 1995) plus a per  meeting fee of $50 for meetings of the
Board of  Directors or  committees of  the Board  of Directors  attended by  the
Director  (the Fund pays  the Chairman of  the Audit Committee  an annual fee of
$750 and pays  the Chairman  of the Committee  of the  Independent Directors  an
additional annual fee of $2,400, in each case inclusive of the Committee meeting
fees).  The Fund  also reimburses  such Directors  for travel  and other out-of-
pocket expenses incurred  by them  in connection with  attending such  meetings.
Directors  and  officers  of the  Fund  who are  or  have been  employed  by the
Investment Manager or an affiliated  company receive no compensation or  expense
reimbursement from the Fund.
 
    The  Fund  has  adopted  a retirement  program  under  which  an Independent
Director who  retires after  serving for  at least  five years  (or such  lesser
period  as may be determined by the Board) as an Independent Director or Trustee
of any Dean Witter Fund that has adopted the retirement program (each such  Fund
referred  to as  an "Adopting  Fund" and  each such  Director referred  to as an
"Eligible Director")  is  entitled  to retirement  payments  upon  reaching  the
eligible  retirement age (normally, after attaining age 72). Annual payments are
based upon length of service. Currently, upon retirement, each Eligible Director
is entitled to receive  from the Fund,  commencing as of  his or her  retirement
date and continuing for the remainder of his or
 
                                       9
<PAGE>
her life, an annual retirement benefit (the "Regular Benefit") equal to 25.0% of
his  or her Eligible Compensation plus  0.4166666% of such Eligible Compensation
for each full  month of service  as an  Independent Director or  Trustee of  any
Adopting  Fund in excess of five years up  to a maximum of 50.0% after ten years
of service. The foregoing percentages may be changed by the Board.(1)  "Eligible
Compensation"  is one-fifth  of the total  compensation earned  by such Eligible
Director for service to the  Fund in the five year  period prior to the date  of
the  Eligible Director's retirement.  Benefits under the  retirement program are
not secured  or  funded by  the  Fund.  As of  the  date of  this  Statement  of
Additional  Information,  57  Dean  Witter  Funds  have  adopted  the retirement
program.
 
    The following table  illustrates the  compensation paid  and the  retirement
benefits  accrued to the Fund's Independent Directors by the Fund for the fiscal
year ended  February 29,  1996 and  the estimated  retirement benefits  for  the
Fund's Independent Directors as of February 29, 1996.
 
<TABLE>
<CAPTION>
                             FUND COMPENSATION                             ESTIMATED RETIREMENT BENEFITS
                      -------------------------------   --------------------------------------------------------------------
 
                                                           ESTIMATED                                            ESTIMATED
                                         RETIREMENT       CREDIT YEARS       ESTIMATED                            ANNUAL
                        AGGREGATE         BENEFITS       OF SERVICE AT     PERCENTAGE OF       ESTIMATED         BENEFITS
NAME OF INDEPENDENT    COMPENSATION      ACCRUED AS        RETIREMENT         ELIGIBLE         ELIGIBLE            UPON
DIRECTOR              FROM THE FUND    FUND EXPENSES      (MAXIMUM 10)      COMPENSATION    COMPENSATION(2)   RETIREMENT(3)
- --------------------  --------------   --------------   ----------------   --------------   ---------------   --------------
<S>                   <C>              <C>              <C>                <C>              <C>               <C>
Michael Bozic.......     $ 1,700          $   442                10            50.0%            $1,900           $   950
Edwin J. Garn.......       1,900              672                10            50.0%             1,900               950
John R. Haire.......       4,488(4)         3,008                10            50.0%             4,727             2,363
Dr. Manuel H.
 Johnson............       1,900              273                10            50.0%             1,900               950
Paul Kolton.........       1,850            1,130                10            49.6%             2,260             1,121
Michael E. Nugent...       1,650              480                10            50.0%             1,900               950
John L. Schroeder...       1,850              867                 8            41.7%             1,900               792
</TABLE>
 
- ------------------------
(1)   An Eligible Director may elect alternate payments of his or her retirement
    benefits based upon the combined  life expectancy of such Eligible  Director
    and  his or her spouse  on the date of  such Eligible Director's retirement.
    The amount estimated to be payable under this method, through the  remainder
    of  the later of the lives of such Eligible Director and spouse, will be the
    actuarial equivalent  of  the Regular  Benefit.  In addition,  the  Eligible
    Director  may elect that the surviving spouse's periodic payment of benefits
    will be equal  to either 50%  or 100%  of the previous  periodic amount,  an
    election  that, respectively,  increases or decreases  the previous periodic
    amount so that the  resulting payments will be  the actuarial equivalent  of
    the Regular Benefit.
 
(2)  Based on current levels of compensation.
 
(3)   Based on  current levels of  compensation. Amount of  annual benefits also
    varies depending  on  the Director's  elections  described in  Footnote  (1)
    above.
 
(4)    Of Mr.  Haire's compensation  from the  Fund,  $3,150 is  paid to  him as
    Chairman of  the Committee  of  the Independent  Directors ($2,400)  and  as
    Chairman of the Audit Committee ($750).
 
                                       10
<PAGE>
    The  following  table  illustrates  the  compensation  paid  to  the  Fund's
Independent Directors for the calendar year ended December 31, 1995 for services
to the 79 Dean Witter Funds and,  in the case of Messrs. Haire, Johnson,  Kolton
and  Nugent, the 11  TCW/DW Funds that  were in operation  at December 31, 1995.
With respect to Messrs. Haire, Johnson, Kolton and Nugent, the TCW/DW Funds  are
included  solely because of a limited exchange privilege between those Funds and
five Dean Witter Money Market Funds. Mr.  Schroeder was elected as a Trustee  of
the TCW/DW Funds on April 20, 1995.
 
           CASH COMPENSATION FROM DEAN WITTER FUNDS AND TCW/DW FUNDS
 
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS    TOTAL CASH
                               FOR SERVICE                          CHAIRMAN OF     COMPENSATION
                              AS DIRECTOR OR                       COMMITTEES OF    FOR SERVICES
                               TRUSTEE AND       FOR SERVICE AS     INDEPENDENT          TO
                             COMMITTEE MEMBER     TRUSTEE AND        DIRECTORS/        79 DEAN
                                OF 79 DEAN      COMMITTEE MEMBER    TRUSTEES AND       WITTER
NAME OF INDEPENDENT               WITTER          OF 11 TCW/DW         AUDIT        FUNDS AND 11
 DIRECTOR                         FUNDS              FUNDS           COMMITTEES     TCW/DW FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------
<S>                          <C>                <C>                <C>              <C>
Michael Bozic..............      $126,050           --                 --             $126,050
Edwin J. Garn..............       136,450           --                 --              136,450
John R. Haire..............        98,450           $82,038           $217,350(5)      397,838
Dr. Manuel H. Johnson......       136,450            82,038            --              218,488
Paul Kolton................       136,450            54,788             36,900(6)      228,138
Michael E. Nugent..........       124,200            75,038            --              199,238
John L. Schroeder..........       136,450            46,964            --              183,414
</TABLE>
 
- ------------------------
(5)  For the 79 Dean Witter Funds in operation at December 31, 1995.
 
(6)  For the 11 TCW/DW Funds in operation at December 31, 1995.
 
    As  of the date  of this Statement of  Additional Information, the aggregate
number of shares of beneficial interest of the Fund owned by the Fund's officers
and Directors  as a  group was  less  than 1  percent of  the Fund's  shares  of
beneficial interest outstanding.
 
INVESTMENT PRACTICES AND POLICIES
- --------------------------------------------------------------------------------
 
FOREIGN SECURITIES
 
    As discussed in the Prospectus, the Fund may invest in securities of foreign
companies.  It  should  be  noted  that there  may  be  less  publicly available
information about  foreign  issuers than  about  domestic issuers,  and  foreign
issuers  may  not be  subject to  accounting,  auditing and  financial reporting
standards and requirements comparable to  those of domestic issuers.  Securities
of  some foreign issuers  are less liquid  and more volatile  than securities of
comparable domestic  issuers and  foreign  brokerage commissions  are  generally
higher  than in the United  States. Foreign securities markets  may also be less
liquid, more volatile  and less subject  to government supervision  than in  the
United  States.  Investments in  foreign countries  could  be affected  by other
factors not present in the United States, including expropriation,  confiscatory
taxation and potential difficulties in enforcing contractual obligations. During
the  fiscal year ended February  29, 1996 the Fund's  purchases of securities of
foreign issuers did not exceed 5% of the Fund's net assets.
 
SECURITY LOANS
 
    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 notice
provisions described  below), and  are at  all  times secured  by cash  or  cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations  and that are at least equal  to the market value, determined daily,
of the loaned securities. The advantage of such loans is that the Fund continues
to receive the income on  the loaned securities while  at the same time  earning
interest  on the cash amounts deposited as collateral, which will be invested in
short-term obligations.
 
    A loan may be terminated by the borrower on one business day's notice, or by
the Fund on four  business days' notice.  If the borrower  fails to deliver  the
loaned   securities   within   four   days   after   receipt   of   notice,  the
 
                                       11
<PAGE>
Fund could  use the  collateral  to replace  the  securities while  holding  the
borrower  liable for any excess of replacement cost over collateral. 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, these loans of portfolio  securities will only be made to
firms deemed by  the Fund's management  to be creditworthy  and when the  income
which  can  be  earned  from  such loans  justifies  the  attendant  risks. Upon
termination of the loan,  the borrower is required  to return the securities  to
the  Fund. Any  gain or loss  in the market  price of the  securities during the
period of  the loan  would  inure to  the Fund.  The  Fund will  pay  reasonable
finder's,  administrative and  custodial fees in  connection with a  loan of its
securities. The creditworthiness of firms to which the Fund lends its  portfolio
securities will be monitored on an ongoing basis.
 
    When  voting or consent rights which accompany loaned securities pass to the
borrower, the Fund will follow the  policy of calling the loaned securities,  to
be  delivered within one day after notice, to permit the exercise of such rights
if the matters involved would have a material effect on the Fund's investment in
such loaned securities. During its fiscal year ended February 29, 1996, the Fund
did not loan any of its portfolio securities and it has no intention of doing so
in the foreseeable future.
 
BORROWING OF MONEY
 
    The Fund did not borrow any money during its fiscal year ended February  29,
1996  and it has no intention of  borrowing any money in the foreseeable future.
(See Investment Restriction 6.)
 
OPTIONS AND FUTURES TRANSACTIONS
 
    As discussed in  the Prospectus,  the Fund  may write  covered call  options
against  securities held  in its portfolio  and covered put  options on eligible
portfolio securities and stock indexes and  purchase options of the same  series
to  effect closing transactions, and may  hedge against potential changes in the
market value of investments (or  anticipated investments) by purchasing put  and
call  options on  portfolio (or eligible  portfolio) securities  and engaging in
transactions involving futures contracts and options on such contracts. Call and
put options on U.S.  Treasury notes, bonds and  bills and equity securities  are
listed  on  Exchanges and  are  written in  over-the-counter  transactions ("OTC
options"). Listed  options  are  issued  by  the  Options  Clearing  Corporation
("OCC").  Ownership of a listed call option gives the Fund the right to buy from
the OCC the  underlying security covered  by the option  at the stated  exercise
price  (the price  per unit  of the underlying  security) by  filing an exercise
notice prior to the expiration  date of the option.  The writer (seller) of  the
option would then have the obligation to sell to the OCC the underlying security
at that exercise price prior to the expiration date of the option, regardless of
its  then current market price. Ownership of  a listed put option would give the
Fund the right to sell the underlying security to the OCC at the stated exercise
price. Upon notice of exercise  of the put option, the  writer of the put  would
have  the obligation  to purchase  the underlying security  from the  OCC at the
exercise price.
 
    OPTIONS ON TREASURY BONDS  AND NOTES.  Because  trading interest in  options
written  on  Treasury bonds  and  notes tends  to  center on  the  most recently
auctioned issues, the exchanges on which such securities trade will not continue
indefinitely to  introduce  options with  new  expirations to  replace  expiring
options  on  particular  issues.  Instead,  the  expirations  introduced  at the
commencement of options  trading on a  particular issue will  be allowed to  run
their  course, with the possible addition of a limited number of new expirations
as the original ones  expire. Options trading  on each issue  of bonds or  notes
will  thus be phased  out as new options  are listed on  more recent issues, and
options representing  a  full  range  of  expirations  will  not  ordinarily  be
available for every issue on which options are traded.
 
    OPTIONS ON TREASURY BILLS.  Because a deliverable Treasury bill changes from
week to week, writers of Treasury bill calls cannot provide in advance for their
potential   exercise  settlement  obligations  by   acquiring  and  holding  the
underlying security. However,  if the  Fund holds  a long  position in  Treasury
bills with a principal amount of the securities deliverable upon exercise of the
option,  the position may be  hedged from a risk standpoint  by the writing of a
call option. For so long as the  call option is outstanding, the Fund will  hold
the Treasury bills in a segregated account with its Custodian, so that they will
be treated as being covered.
 
    OTC  OPTIONS.  Exchange-listed  options are issued by  the OCC which assures
that all transactions  in such options  are properly executed.  OTC options  are
purchased from or sold (written) to dealers or financial
 
                                       12
<PAGE>
institutions  which have entered into direct  agreements with the Fund. With OTC
options, such variables as expiration date,  exercise price and premium will  be
agreed   upon  between  the  Fund  and   the  transacting  dealer,  without  the
intermediation of a third party such as the OCC. If the transacting dealer fails
to make or take delivery of the securities underlying an option it has  written,
in  accordance with the  terms of that  option, the Fund  would lose the premium
paid for the option as well as any anticipated benefit of the transaction.  This
Fund  will engage in  OTC option transactions only  with primary U.S. Government
securities dealers recognized by the Federal Reserve Bank of New York.
 
    COVERED CALL WRITING.  As stated in the Prospectus, the Fund is permitted to
write covered call options on portfolio securities in order to aid in  achieving
its  investment objective.  Generally, a  call option  is "covered"  if the Fund
owns, or has the right to acquire, without additional cash consideration (or for
additional cash consideration held for the Fund by its Custodian in a segregated
account) the underlying security subject to  the option except that in the  case
of  call options on U.S. Treasury Bills,  the Fund might own U.S. Treasury Bills
of a  different  series  from those  underlying  the  call option,  but  with  a
principal  amount and value  corresponding to the exercise  price and a maturity
date no later than that of the  securities deliverable under the call option.  A
call option is also covered if the Fund holds a call on the same security as the
underlying  security of the written option, where the exercise price of the call
used for  coverage is  equal to  or less  than the  exercise price  of the  call
written  or greater than the  exercise price of the call  written if the mark to
market difference is maintained by the Fund in cash, U.S. Government  securities
or  other  high grade  debt obligations  which  the Fund  holds in  a segregated
account maintained with its Custodian.
 
    The Fund  will receive  from the  purchaser, in  return for  a call  it  has
written,  a "premium"; i.e., the price of  the option. Receipt of these premiums
may better enable  the Fund  to achieve  a greater  total return  than would  be
realized  from holding  the underlying  securities alone.  Moreover, the premium
received will offset a portion of the potential loss incurred by the Fund if the
securities underlying the option are ultimately sold by the Fund at a loss.  The
premium  received will fluctuate with varying economic market conditions. If the
market value  of the  portfolio securities  upon which  call options  have  been
written  increases, the Fund may  receive less total return  from the portion of
its portfolio upon which  calls have been  written than it  would have had  such
calls not been written.
 
    During  the option period, the Fund may be required, at any time, to deliver
the underlying security against  payment of the exercise  price on any calls  it
has  written  (exercise of  certain listed  options may  be limited  to specific
expiration dates).  This obligation  is terminated  upon the  expiration of  the
option period or at such earlier time when the writer effects a closing purchase
transaction.  A closing  purchase transaction  is accomplished  by purchasing an
option of the same  series as the option  previously written. However, once  the
Fund  has been assigned an exercise notice, the  Fund will be unable to effect a
closing purchase transaction.
 
    Closing purchase transactions are ordinarily effected to realize a profit on
an outstanding call option, to prevent an underlying security from being called,
to permit the  sale of an  underlying security or  to enable the  Fund to  write
another  call option on the underlying security with either a different exercise
price or expiration date or both. Also, effecting a closing purchase transaction
will permit the  cash or  proceeds from the  concurrent sale  of any  securities
subject to the option to be used for other investments by the Fund. The Fund may
realize  a net gain or  loss from a closing  purchase transaction depending upon
whether the amount of the  premium received on the call  option is more or  less
than  the cost of effecting the  closing purchase transaction. Any loss incurred
in a  closing  purchase  transaction  may  be  wholly  or  partially  offset  by
unrealized  appreciation  in  the  market  value  of  the  underlying  security.
Conversely, a gain resulting from a closing purchase transaction could be offset
in whole  or in  part  or exceeded  by a  decline  in the  market value  of  the
underlying security.
 
    If a call option expires unexercised, the Fund realizes a gain in the amount
of the premium on the option less the commission paid. Such a gain, however, may
be  offset by depreciation in the market value of the underlying security during
the option period. If a  call option is exercised, the  Fund realizes a gain  or
loss  from the sale of  the underlying security equal  to the difference between
the purchase price of the  underlying security and the  proceeds of the sale  of
the security plus the premium received on the option less the commission paid.
 
                                       13
<PAGE>
    Options  written by a Fund normally have expiration dates of from up to nine
months (equity securities) to eighteen months (fixed-income securities) from the
date written. The  exercise price of  a call option  may be below,  equal to  or
above the current market value of the underlying security at the time the option
is written. See "Risks of Options and Futures Transactions," below.
 
    COVERED  PUT WRITING.  As stated in the Prospectus, as a writer of a covered
put option, the  Fund incurs an  obligation to buy  the security underlying  the
option from the purchaser of the put, at the option's exercise price at any time
during  the  option  period, at  the  purchaser's election  (certain  listed put
options written by  the Fund  will be  exercisable by  the purchaser  only on  a
specific  date). A put is  "covered" if, at all times,  the Fund maintains, in a
segregated account maintained on its behalf at the Fund's Custodian, cash,  U.S.
Government  securities or other high grade obligations  in an amount equal to at
least the exercise price of the option,  at all times during the option  period.
Similarly,  a short put position could be covered by the Fund by its purchase of
a put option  on the same  security as  the underlying security  of the  written
option,  where the exercise  price of the  purchased option is  equal to or more
than the exercise price of  the put written or less  than the exercise price  of
the  put written if the  mark to market difference is  maintained by the Fund in
cash, U.S. Government securities or other high grade debt obligations which  the
Fund holds in a segregated account maintained at its Custodian. In writing puts,
the  Fund assumes  the risk of  loss should  the market value  of the underlying
security decline  below  the  exercise  price of  the  option  (any  loss  being
decreased  by the  receipt of  the premium  on the  option written).  During the
option period, the Fund  may be required,  at any time, to  make payment of  the
exercise price against delivery of the underlying security. The operation of and
limitations on covered put options in other respects are substantially identical
to those of call options.
 
    The  Fund will write put options for two purposes: (1) to receive the income
derived from  the premiums  paid  by purchasers;  and  (2) when  the  Investment
Manager  wishes to purchase the security underlying  the option at a price lower
than its current market price, in which case it will write the covered put at an
exercise price reflecting the lower purchase price sought. The potential gain on
a covered put option is limited to the premium received on the option (less  the
commissions  paid  on  the  transaction) while  the  potential  loss  equals the
differences between the  exercise price  of the  option and  the current  market
price  of the  underlying securities  when the put  is exercised,  offset by the
premium received (less the commissions paid on the transaction).
 
    PURCHASING CALL AND PUT OPTIONS.  As stated in the Prospectus, the Fund  may
purchase  listed and OTC call and put options on securities and stock indexes in
amounts equalling up to  10% of its total  assets, with a maximum  of 5% of  the
Fund's  assets  invested in  stock  index options.  The  Fund may  purchase call
options only in order to  close out a covered  call position (see "Covered  Call
Writing" above). The purchase of the call option to effect a closing transaction
on  a call  written over-the-counter may  be a  listed or OTC  option. In either
case, the call purchased  is likely to  be on the same  securities and have  the
same  terms as  the written  option. If  purchased over-the-counter,  the option
would generally  be acquired  from  the dealer  or financial  institution  which
purchased the call written by the Fund.
 
    The  Fund may purchase put options on  securities which it holds (or has the
right to acquire) in its portfolio only  to protect itself against a decline  in
the  value of the security. If the value of the underlying security were to fall
below the exercise  price of the  put purchased  in an amount  greater than  the
premium  paid for the option, the Fund  would incur no additional loss. The Fund
may also purchase put  options to close  out written put  positions in a  manner
similar to call options closing purchase transactions. In addition, the Fund may
sell  a put option  which it has previously  purchased prior to  the sale of the
securities underlying such option.  Such a sale  would result in  a net gain  or
loss  depending on whether the amount received on  the sale is more or less than
the premium and other transaction  costs paid on the  put option which is  sold.
And  such gain or loss  could be offset in  whole or in part  by a change in the
market value of the underlying security. If  a put option purchased by the  Fund
expired without being sold or exercised, the premium would be lost.
 
    RISKS  OF OPTIONS TRANSACTIONS.  During  the option period, the covered call
writer has, in return for  the premium on the  option, given up the  opportunity
for capital appreciation above the exercise price should the market price of the
underlying security increase, but has retained the risk of loss should the price
of the underlying security decline. The secured put writer also retains the risk
of loss should the market value of the
 
                                       14
<PAGE>
underlying  security decline  below the  exercise price  of the  option less the
premium received on the  sale of the  option. In both cases,  the writer has  no
control  over the time  when it may be  required to fulfill  its obligation as a
writer of the option. Once an option writer has received an exercise notice,  it
cannot  effect  a  closing  purchase  transaction  in  order  to  terminate  its
obligation  under  the  option  and  must  deliver  or  receive  the  underlying
securities at the exercise price.
 
    Prior  to exercise or expiration, an  option position can only be terminated
by entering  into a  closing purchase  or sale  transaction. If  a covered  call
option writer is unable to effect a closing purchase transaction, it cannot sell
the  underlying security  until the option  expires or the  option is exercised.
Accordingly, a covered call option writer may not be able to sell an  underlying
security  at a time when it might otherwise  be advantageous to do so. A secured
put option writer who is unable  to effect a closing purchase transaction  would
continue  to bear  the risk  of decline  in the  market price  of the underlying
security until the option  expires or is exercised.  In addition, a secured  put
writer  would be unable to utilize the amount held in cash or U.S. Government or
other high  grade debt  obligations as  security for  the put  option for  other
investment purposes until the exercise or expiration of the option.
 
    The  Fund's ability to  close out its position  as a writer  of an option is
dependent upon the existence of a  liquid secondary market on Option  Exchanges.
There is no assurance that such a market will exist, particularly in the case of
OTC  options. However,  the Fund  may be able  to purchase  an offsetting option
which does not close out  its position as a writer  but constitutes an asset  of
equal  value to the obligation under the option written. If the Fund is not able
to either enter into  a closing purchase transaction  or purchase an  offsetting
position, it will be required to maintain the securities subject to the call, or
the  collateral underlying the put, even though  it might not be advantageous to
do so,  until a  closing  transaction can  be entered  into  (or the  option  is
exercised or expires).
 
    Among  the possible reasons for the absence  of a liquid secondary market on
an Exchange  are: (i)  insufficient trading  interest in  certain options;  (ii)
restrictions  on  transactions  imposed  by an  Exchange;  (iii)  trading halts,
suspensions or other restrictions imposed with respect to particular classes  or
series  of options  or underlying  securities; (iv)  interruption of  the normal
operations on an Exchange;  (v) inadequacy of the  facilities of an Exchange  or
the  OCC to  handle current trading  volume; or (vi)  a decision by  one or more
Exchanges to discontinue the trading of options (or a particular class or series
of options), in which event  the secondary market on  that Exchange (or in  that
class  or series of options) would  cease to exist, although outstanding options
on that Exchange that had been issued by  the OCC as a result of trades on  that
Exchange  would generally continue  to be excercisable  in accordance with their
terms.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in  options, the  Fund  could experience  delays and/or  losses  in
liquidating  open positions purchased or sold  through the broker and/or incur a
loss of all or part  of its margin deposits with  the broker. Similarly, in  the
event  of the bankruptcy of  the writer of an OTC  option purchased by the Fund,
the Fund could  experience a loss  of all or  part of the  value of the  option.
Transactions  are  entered  into by  the  Fund  only with  brokers  or financial
institutions deemed creditworthy by the Investment Manager.
 
    Each of  the Exchanges  has established  limitations governing  the  maximum
number  of  call or  put  options on  the  same underlying  security  or futures
contract (whether or  not covered) which  may be written  by a single  investor,
whether  acting  alone or  in concert  with others  (regardless of  whether such
options are written on the same or different Exchanges or are held or written on
one or more accounts or through one or more brokers). An Exchange may order  the
liquidation  of positions found  to be in  violation of these  limits and it may
impose other sanctions or restrictions.  These position limits may restrict  the
number of listed options which the Fund may write.
 
                                       15
<PAGE>
    The  hours of trading for options may  not conform to the hours during which
the underlying securities  are traded.  To the  extent that  the option  markets
close  before the markets  for the underlying  securities, significant price and
rate movements can take place in the underlying markets that cannot be reflected
in the option markets.
 
    STOCK INDEX OPTIONS.  As stated in the Prospectus, options on stock  indexes
are  similar to options on  stock except that, rather than  the right to take or
make delivery of stock at  a specified price, an option  on a stock index  gives
the  holder the right to receive, upon exercise of the option, an amount of cash
if the  closing level  of the  stock index  upon which  the option  is based  is
greater  than, in the case  of a call, or  less than, in the  case of a put, the
exercise price of the option.  This amount of cash  is equal to such  difference
between  the closing  price of the  index and  the exercise price  of the option
expressed  in  dollars  times  a  specified  multiple  (the  "multiplier").  The
multiplier  for  an index  option performs  a  function similar  to the  unit of
trading for a stock option. It determines the total dollar value per contract of
each point in the  difference between the  exercise price of  an option and  the
current  level  of  the underlying  index.  A  multiplier of  100  means  that a
one-point difference  will yield  $100. Options  on different  indexes may  have
different  multipliers. The writer of the option is obligated, in return for the
premium received, to  make delivery of  this amount. Unlike  stock options,  all
settlements  are in cash  and a gain or  loss depends on  price movements in the
stock market generally (or  in a particular segment  of the market) rather  than
the  price movements in individual stocks.  Currently, options are traded on the
S&P 100 Index and the S&P 500  Index on the Chicago Board Options Exchange,  the
Major   Market  Index  and   the  Computer  Technology   Index,  Oil  Index  and
Institutional Index on the American Stock  Exchange and the NYSE Index and  NYSE
Beta Index on the New York Stock Exchange, The Financial News Composite Index on
the  Pacific Stock Exchange and  the Value Line Index,  National O-T-C Index and
Utilities Index  on the  Philadelphia  Stock Exchange,  each  of which  and  any
similar  index on which  options are traded  in the future  which include stocks
that are not  limited to any  particular industry  or segment of  the market  is
referred  to as a "broadly based stock  market index." The Fund will invest only
in broadly based indexes. Options on broad-based stock indexes provide the  Fund
with  a  means of  protecting the  Fund against  the risk  of market  wide price
movements. If  the Investment  Manager anticipates  a market  decline, the  Fund
could  purchase  a  stock  index  put option.  If  the  expected  market decline
materialized, the resulting decrease in the value of the Fund's portfolio  would
be  offset to the extent of the increase in  the value of the put option. If the
Investment Manager anticipates  a market  rise, the  Fund may  purchase a  stock
index  call  option  to  enable  the Fund  to  participate  in  such  rise until
completion of  anticipated common  stock purchases  by the  Fund. Purchases  and
sales of stock index options also enable the Investment Manager to more speedily
achieve changes in the Fund's equity positions.
 
    The  Fund will write put options on stock indexes only if such positions are
covered by cash, U.S. Government securities or other high grade debt obligations
equal to the aggregate  exercise price of the  puts, or by a  put option on  the
same  stock index with a strike price no  lower than the strike price of the put
option sold  by the  Fund, which  cover is  held for  the Fund  in a  segregated
account  maintained for it  by the Fund's  Custodian. All call  options on stock
indexes written by  the Fund will  be covered  either by a  portfolio of  stocks
substantially  replicating the movement of the  index underlying the call option
or by holding a separate call option on the same stock index with a strike price
no higher than the strike price of the call option sold by the Fund.
 
    RISKS OF OPTIONS ON INDEXES.   Because exercises of stock index options  are
settled  in cash, call  writers such as  the Fund cannot  provide in advance for
their potential settlement obligations by  acquiring and holding the  underlying
securities. A call writer can offset some of the risk of its writing position by
holding  a  diversified  portfolio  of  stocks similar  to  those  on  which the
underlying index  is  based. However,  most  investors cannot,  as  a  practical
matter,  acquire and hold a portfolio containing  exactly the same stocks as the
underlying index, and, as a result, bear a risk that the value of the securities
held will vary from the value of the  index. Even if an index call writer  could
assemble  a  stock  portfolio that  exactly  reproduced the  composition  of the
underlying index,  the writer  still would  not  be fully  covered from  a  risk
standpoint  because of the "timing risk" inherent in writing index options. When
an index option is exercised, the amount of cash that the holder is entitled  to
receive  is  determined by  the difference  between the  exercise price  and the
closing index level  on the date  when the  option is exercised.  As with  other
kinds  of  options,  the  writer  will  not  learn  that  it  has  been assigned
 
                                       16
<PAGE>
until the next business day, at the earliest. The time lag between exercise  and
notice  of  assignment poses  no risk  for the  writer  of a  covered call  on a
specific underlying security, such as a common stock, because there the writer's
obligation is to deliver the underlying security,  not to pay its value as of  a
fixed  time  in the  past. So  long as  the writer  already owns  the underlying
security, it can satisfy its settlement obligations by simply delivering it, and
the risk that its value  may have declined since the  exercise date is borne  by
the  exercising holder. In contrast,  even if the writer  of an index call holds
stocks that exactly match the composition  of the underlying index, it will  not
be able to satisfy its assignment obligations by delivering those stocks against
payment  of the exercise price.  Instead, it will be required  to pay cash in an
amount based on the closing index value on the exercise date; and by the time it
learns that  it  has  been  assigned,  the  index  may  have  declined,  with  a
corresponding  decrease in the value of  its stock portfolio. This "timing risk"
is an inherent limitation on  the ability of index  call writers to cover  their
risk exposure by holding stock positions.
 
    A  holder of an index option who exercises it before the closing index value
for that day is available runs the  risk that the level of the underlying  index
may  subsequently change. If such  a change causes the  exercised option to fall
out-of-the-money, the exercising holder will  be required to pay the  difference
between  the closing index value and the exercise price of the option (times the
applicable multiplier) to the assigned writer.
 
    If dissemination of the current level of an underlying index is interrupted,
or if trading is interrupted in  stocks accounting for a substantial portion  of
the  value of an index, the trading of  options on that index will ordinarily be
halted. If the trading of options on an underlying index is halted, an  exchange
may impose restrictions prohibiting the exercise of such options.
 
    FUTURES  CONTRACTS.  As stated in the  Prospectus, the Fund may purchase and
sell interest rate and stock index futures contracts ("futures contracts")  that
are  traded on  U.S. commodity exchanges  on such underlying  securities as U.S.
Treasury bonds, notes, bills and GNMA Certificates ("interest rate" futures) and
such indexes as the S&P 500  Index, the Moody's Investment-Grade Corporate  Bond
Index and the New York Stock Exchange Composite Index ("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 interest  rate futures  contracts and bond
index futures contracts for  the purpose of  hedging its fixed-income  portfolio
(or  anticipated portfolio)  securities against  changes in  prevailing interest
rates. If the Investment Manager anticipates  that interest rates may rise  and,
concomitantly,  the price of fixed-income securities falls, the Fund may sell an
interest rate futures contract  or a bond index  futures contract. If  declining
interest  rates are anticipated, the Fund  may purchase an interest rate futures
contract to protect against a potential increase in the price of U.S. Government
securities the Fund intends to purchase. Subsequently, appropriate  fixed-income
securities may be purchased by the Fund in an orderly fashion; as securities are
purchased,  corresponding futures  positions would  be terminated  by offsetting
sales of contracts.
 
    The Fund will purchase or sell stock index futures contracts for the purpose
of hedging its  equity portfolio (or  anticipated portfolio) securities  against
changes  in their prices. If the  Investment Manager anticipates that the prices
of stock held  by the Fund  may fall, the  Fund may sell  a stock index  futures
contract.  Conversely,  if  the  Investment  Manager  wishes  to  hedge  against
anticipated price rises in those stocks which the Fund intends to purchase,  the
Fund  may purchase stock index futures contracts. In addition, interest rate and
stock index futures contracts  will be bought  or sold in order  to close out  a
short or long position in a corresponding futures contract.
 
    Although  most interest rate  futures contracts call  for actual delivery or
acceptance of  securities,  the contracts  usually  are closed  out  before  the
settlement  date without the  making or taking of  delivery. Stock index futures
contracts provide for the  delivery of an  amount of cash  equal to a  specified
dollar  amount times the difference between the stock index value at the open or
close   of    the    last   trading    day    of   the    contract    and    the
 
                                       17
<PAGE>
futures  contract price. A  futures contract sale  is closed out  by effecting a
futures contract purchase for the same aggregate amount of the specific type  of
equity  security  and the  same delivery  date.  If the  sale price  exceeds the
offsetting purchase price,  the seller would  be paid the  difference and  would
realize  a gain. If  the offsetting purchase  price exceeds the  sale price, the
seller would pay the difference and  would realize a loss. Similarly, a  futures
contract  purchase is closed  out by effecting  a futures contract  sale for the
same aggregate amount  of the specific  type of security  and the same  delivery
date.  If the  offsetting sale price  exceeds the purchase  price, the purchaser
would realize a gain, whereas if the purchase price exceeds the offsetting  sale
price,  the purchaser would realize a loss.  There is no assurance that the Fund
will be able to enter into a closing transaction.
 
    INTEREST RATE FUTURES CONTRACTS.  When the Fund enters into an interest rate
futures contract, it is initially required to deposit with the Fund's Custodian,
in a segregated account in the name of the broker performing the transaction, an
"initial margin"  of cash  or U.S.  Government securities  or other  high  grade
short-term obligations equal to approximately 2% of the contract amount. Initial
margin  requirements are established by the Exchanges on which futures contracts
trade and may,  from time to  time, change. In  addition, brokers may  establish
margin deposit requirements in excess of those required by the Exchanges.
 
    Initial   margin  in  futures  transactions  is  different  from  margin  in
securities transactions in that initial margin does not involve the borrowing of
funds by a brokers' client but is,  rather, a good faith deposit on the  futures
contract  which will be returned to the  Fund upon the proper termination of the
futures contract. The margin  deposits made are marked  to market daily and  the
Fund  may be  required to  make subsequent deposits  of cash  or U.S. Government
securities called "variation margin," with the Fund's futures contract  clearing
broker,  which are  reflective of  price fluctuations  in the  futures contract.
Currently, interest rate futures contracts  can be purchased on debt  securities
such  as  U.S. Treasury  Bills and  Bonds, U.S.  Treasury Notes  with Maturities
between 6 1/2 and 10 years, GNMA Certificates and Bank Certificates of Deposit.
 
    INDEX FUTURES  CONTRACTS.   As discussed  in the  Prospectus, the  Fund  may
invest  in index  futures contracts. An  index futures contract  sale creates an
obligation by the Fund, as seller, to  deliver cash at a specified future  time.
An  index futures contract purchase  would create an obligation  by the Fund, as
purchaser, to  take  delivery  of  cash at  a  specified  future  time.  Futures
contracts  on indexes  do not require  the physical delivery  of securities, but
provide for  a final  cash  settlement on  the  expiration date  which  reflects
accumulated profits and losses credited or debited to each party's account.
 
    The  Fund  is  required to  maintain  margin deposits  with  brokerage firms
through which it  effects index futures  contracts in a  manner similar to  that
described  above  for interest  rate futures  contracts. Currently,  the initial
margin requirements  range from  3% to  10%  of the  contract amount  for  index
futures.  In addition,  due to  current industry  practice, daily  variations in
gains and losses on open contracts are  required to be reflected in cash in  the
form  of variation margin payments. The Fund  may be required to make additional
margin payments during the term of the contract.
 
    At any time prior to expiration of the futures contract, the Fund may  elect
to  close the  position by  taking an  opposite position  which will  operate to
terminate the Fund's position in the futures contract. A final determination  of
variation  margin is  then made, additional  cash is  required to be  paid by or
released to the Fund and the Fund realizes a loss or a gain.
 
    Currently, index futures contracts can be purchased or sold with respect to,
among others, the Standard  & Poor's 500  Stock Price Index  and the Standard  &
Poor's  100 Stock Price Index  on the Chicago Mercantile  Exchange, the New York
Stock Exchange  Composite Index  on the  New York  Futures Exchange,  the  Major
Market  Index on the American Stock Exchange,  the Value Line Stock Index on the
Kansas City Board of Trade and the Moody's Investment-Grade Corporate Bond Index
on the Chicago Board of Trade.
 
    OPTIONS ON FUTURES CONTRACTS.  The Fund may purchase and write call and  put
options on futures contracts and enter into closing transactions with respect to
such  options to terminate an existing position. An option on a futures contract
gives the purchaser the right (in return  for the premium paid), and the  writer
the  obligation, to assume a position in  a futures contract (a long position if
the option is a call and a short position if the option is a put) at a specified
exercise price at  any time  during the  term of  the option.  Upon exercise  of
 
                                       18
<PAGE>
the  option, the delivery of the futures position by the writer of the option to
the holder of the option is  accompanied by delivery of the accumulated  balance
in the writer's futures margin account, which represents the amount by which the
market  price of the  futures contract at  the time of  exercise exceeds, in the
case of a call, or is less than, in the case of a put, the exercise price of the
option on the futures contract.
 
    The Fund will purchase and write options on futures contracts for  identical
purposes  to  those set  forth  above for  the  purchase of  a  futures contract
(purchase of a call option or  sale of a put option)  and the sale of a  futures
contract  (purchase of a put option or sale of a call option), or to close out a
long or short  position in futures  contracts. If, for  example, the  Investment
Manager  wished  to  protect  against  an increase  in  interest  rates  and the
resulting negative  impact  on  the  value of  a  portion  of  its  fixed-income
portfolio,  it might write a  call option on an  interest rate futures contract,
the underlying security of  which correlates with the  portion of the  portfolio
the  Investment Manager seeks to hedge. Any  premiums received in the writing of
options on futures  contracts may, of  course, augment the  total return of  the
Fund  and thereby  provide a further  hedge against losses  resulting from price
declines in portions of the Fund's portfolio.
 
    The writer of an option on a futures contract is required to deposit initial
and variation margin  pursuant to  requirements similar to  those applicable  to
futures  contracts. Premiums received from the writing of an option on a futures
contract are included in initial margin deposits.
 
    LIMITATIONS ON FUTURES CONTRACTS AND OPTIONS  ON FUTURES.  The Fund may  not
enter into futures contracts or purchase related options thereon if, immediately
thereafter, the amount committed to margin plus the amount paid for premiums for
unexpired  options on futures  contracts exceeds 5%  of the value  of the Fund's
total assets, after taking into  account unrealized gains and unrealized  losses
on such contracts it has entered into, provided, however, that in the case of an
option that is in-the-money (the exercise price of the call (put) option is less
(more)  than  the  market price  of  the  underlying security)  at  the  time of
purchase, the  in-the-money  amount  may  be excluded  in  calculating  the  5%.
However,  there is no overall limitation on  the percentage of the Fund's assets
which may be subject to  a hedge position. In  addition, in accordance with  the
regulations of the Commodity Futures Trading Commission ("CFTC") under which the
Fund  is exempted from registration  as a commodity pool  operator, the Fund may
only enter into futures contracts and options on futures contracts  transactions
for  purposes of hedging a part or all of its portfolio. If the CFTC changes its
regulations so that  the Fund  would be permitted  to write  options on  futures
contracts  for purposes other  than hedging the  Fund's investments without CFTC
registration, the  Fund may  engage  in such  transactions for  those  purposes.
Except  as described above, there are no other limitations on the use of futures
and options thereon by the Fund.
 
    RISKS OF TRANSACTIONS IN FUTURES CONTRACTS  AND RELATED OPTIONS.  As  stated
in  the Prospectus, the Fund may sell  a futures contract to protect against the
decline in the value  of securities held  by the Fund.  However, it is  possible
that  the futures  market may advance  and the  value of securities  held in the
portfolio of the Fund may decline. If  this occurred, the Fund would lose  money
on  the futures contract and also experience a decline in value of its portfolio
securities. However, while this could occur for a very brief period or to a very
small degree, over time the value of  a diversified portfolio will tend to  move
in the same direction as the futures contracts.
 
    If  the Fund purchases a  futures contract to hedge  against the increase in
value of  securities  it  intends to  buy,  and  the value  of  such  securities
decreases,  then  the Fund  may determine  not  to invest  in the  securities as
planned and will realize a loss on the futures contract that is not offset by  a
reduction in the price of the securities.
 
    In  order to assure that  the Fund is entering  into transactions in futures
contracts for hedging  purposes as  such is  defined by  the CFTC  either: 1)  a
substantial  majority  (i.e.,  approximately  75%)  of  all  anticipatory  hedge
transactions (transactions in which  the Fund does  not own at  the time of  the
transaction,  but  expects to  acquire, the  securities underlying  the relevant
futures contract) involving the purchase of futures contracts will be  completed
by  the purchase  of securities  which are the  subject of  the hedge  or 2) the
underlying value of all long positions in futures contracts will not exceed  the
total value of a) all short-term debt obligations held by the Fund; b) cash held
by the Fund; c) cash proceeds due to the Fund on investments within thirty days;
d)  the margin deposited on the contracts; and e) any unrealized appreciation in
the value of the contracts.
 
                                       19
<PAGE>
    If the Fund maintains a short position  in a futures contract or has sold  a
call  option in a futures contract, it will cover this position by holding, in a
segregated account maintained at its Custodian, cash, U.S. Government securities
or other high grade debt obligations equal  in value (when added to any  initial
or variation margin on deposit) to the market value of the securities underlying
the  futures contract or the  exercise price of the  option. Such a position may
also be covered by owning the securities underlying the futures contract (in the
case of a stock index futures  contract a portfolio of securities  substantially
replicating the relevant index), or by holding a call option permitting the Fund
to  purchase the same contract at a price  no higher than the price at which the
short position was established.
 
    In addition, if the Fund holds a long position in a futures contract or  has
sold  a put  option on a  futures contract,  it will hold  cash, U.S. Government
securities or other high grade debt  obligations equal to the purchase price  of
the contract or the exercise price of the put option (less the amount of initial
or  variation margin on deposit) in a segregated account maintained for the Fund
by its  Custodian. Alternatively,  the Fund  could cover  its long  position  by
purchasing  a put option on the same  futures contract with an exercise price as
high or higher than the price of the contract held by the Fund.
 
    Exchanges limit the amount by which the price of a futures contract 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. In the event of adverse price movements, the Fund would continue to
be required to  make daily  cash payments of  variation margin  on open  futures
positions. In such situations, if the Fund has insufficient cash, it may have to
sell  portfolio securities to meet daily variation margin requirements at a time
when it may be disadvantageous to do  so. In addition, the Fund may be  required
to  take or  make delivery of  the instruments underlying  interest rate futures
contracts it holds at a time when it is disadvantageous to do so. The  inability
to  close out options and futures positions could also have an adverse impact on
the Fund's ability to effectively hedge its portfolio.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in futures  or options  thereon, the Fund  could experience  delays
and/or losses in liquidating open positions purchased or sold through the broker
and/or  incur a  loss of  all or part  of its  margin deposits  with the broker.
Transactions are  entered  into by  the  Fund  only with  brokers  or  financial
institutions deemed creditworthy by the Investment Manager.
 
    As  stated  in  the Prospectus,  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 hedge. 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.  Price distortions  could  also result  if  investors  in
futures  contracts opt to make or  take delivery of underlying securities rather
than engage  in closing  transactions  due to  the  resultant reduction  in  the
liquidity  of the futures  market. In addition,  due to the  fact that, from the
point of view of  speculators, the deposit requirements  in the futures  markets
are  less  onerous  than  margin  requirements  in  the  cash  market, increased
participation by speculators in the  futures market could cause temporary  price
distortions.  Due to the possibility of  price distortions in the futures market
and because of  the imperfect  correlation between  movements in  the prices  of
securities  and movements in the prices of futures contracts, a correct forecast
of stock price or interest rate trends  by the Investment Manager may still  not
result in a successful hedging transaction.
 
    As  stated in the Prospectus, there is  no assurance that a liquid secondary
market will exist for  futures contracts and related  options in which the  Fund
may  invest. In the event a liquid market does not exist, it may not be possible
to close out a futures  position and, in the  event of adverse price  movements,
the  Fund would continue to be required to make daily cash payments of variation
margin. In addition,  limitations imposed by  an exchange or  board of trade  on
which  futures contracts are traded may compel  or prevent the Fund from closing
out a contract which may result in  reduced gain or increased loss to the  Fund.
The absence of a liquid market in futures contracts might cause the Fund to make
or  take  delivery  of  the underlying  securities  at  a time  when  it  may be
disadvantageous to do so.
 
                                       20
<PAGE>
    Compared to the purchase or sale of futures contracts, the purchase of  call
or  put options on  futures contracts involves  less potential risk  to the Fund
because the maximum amount  at risk is  the premium paid  for the options  (plus
transaction  costs). However, there may be  circumstances when the purchase of a
call or put  option on a  futures contract would  result in a  loss to the  Fund
notwithstanding that the purchase or sale of a futures contract would not result
in  a loss, as in the  instance where there is no  movement in the prices of the
futures contract or underlying securities.
 
REPURCHASE AGREEMENTS
 
    When cash may be available  for only a few days,  it may be invested by  the
Fund in repurchase agreements until such time as it may otherwise be invested or
used  for payments of  obligations of the  Fund. These agreements,  which may be
viewed as  a  type  of  secured  lending by  the  Fund,  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  ("collateral")  at  a
specified  price and at a fixed time in  the future, usually not more than seven
days from  the  date  of  purchase.  The collateral  will  be  maintained  in  a
segregated  account and  will be  marked to market  daily to  determine that the
value of the collateral, as specified in the agreement, does not decrease  below
the  purchase price plus  accrued interest. If  such decrease occurs, additional
collateral will  be  requested and,  when  received,  added to  the  account  to
maintain  full  collateralization.  The  Fund  will  accrue  interest  from  the
institution until the time when the  repurchase is to occur. Although such  date
is  deemed by the  Fund to be the  maturity date of  a repurchase agreement, the
maturities of securities subject to repurchase agreements are not subject to any
limits.
 
    While repurchase agreements involve certain risks not associated with direct
investments in debt securities, the Fund follows procedures designed to minimize
such risks. These procedures include effecting repurchase transactions only with
large,  well-capitalized  and  well-established  financial  institutions   whose
financial  condition  will be  continually monitored  by the  Investment Manager
subject to procedures  established by  the Board of  Directors of  the Fund.  In
addition,  as  described  above,  the value  of  the  collateral  underlying the
repurchase agreement will be at least  equal to the repurchase price,  including
any  accrued interest  earned on  the repurchase  agreement. In  the event  of a
default or bankruptcy by a selling financial institution, the Fund will seek  to
liquidate  such  collateral.  However, the  exercising  of the  Fund's  right to
liquidate such collateral  could involve  certain costs  or delays  and, to  the
extent  that  proceeds  from  any  sale upon  a  default  of  the  obligation to
repurchase were less than the repurchase price, the Fund could suffer a loss. It
is the current policy of the Fund not to invest in repurchase agreements that do
not mature within  seven days if  any such investment,  together with any  other
illiquid assets held by the Fund, amounts to more than 15% of its total assets.
 
WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS
 
    From  time to  time the  Fund may  purchase securities  on a  when-issued or
delayed delivery  basis  or  may  purchase  or  sell  securities  on  a  forward
commitment  basis. When such transactions are  negotiated, the price is fixed at
the time of the commitment, but delivery  and payment can take place a month  or
more  after the date of commitment. While the Fund will only purchase securities
on a  when-issued,  delayed  delivery  or  forward  commitment  basis  with  the
intention  of acquiring the securities, the  Fund may sell the securities before
the settlement date, if it is  deemed advisable. The securities so purchased  or
sold  are subject to market  fluctuation and no interest  or dividends accrue to
the purchaser prior  to the  settlement date.  At the  time the  Fund makes  the
commitment  to purchase or sell securities on a when-issued, delayed delivery or
forward commitment basis, it will record the transaction and thereafter  reflect
the  value, each day, of such security purchased,  or if a sale, the proceeds to
be received, in determining its net asset value. At the time of delivery of  the
securities, their value may be more or less than the purchase or sale price. The
Fund  will also establish a segregated account  with its custodian bank in which
it will continually maintain cash or  cash equivalents or other high grade  debt
portfolio  securities equal in value to  commitments to purchase securities on a
when-issued, delayed delivery  or forward  commitment basis.  During the  fiscal
year  ended  February  29, 1996,  the  Fund  did not  purchase  securities  on a
when-issued, delayed delivery or forward commitment basis.
 
                                       21
<PAGE>
WHEN, AS AND IF ISSUED SECURITIES
 
    The Fund may purchase securities on a  "when, as and if issued" basis  under
which  the issuance of the security depends  upon the occurrence of a subsequent
event,  such  as  approval  of  a  merger,  corporate  reorganization  or   debt
restructuring.  The commitment for the purchase of any such security will not be
recognized in the portfolio of the Fund until the Investment Manager  determines
that  issuance of the security  is probable. At such  time, the Fund will record
the transaction and, in determining its net asset value, will reflect the  value
of  the security daily. At such time,  the Fund will also establish a segregated
account with  its  custodian  bank  in  which it  will  maintain  cash  or  cash
equivalents  or other  high grade  debt portfolio  securities equal  in value to
recognized commitments for such securities. The value of the Fund's  commitments
to  purchase the securities  of any one  issuer, together with  the value of all
securities of such issuer owned by the Fund,  may not exceed 5% of the value  of
the  Fund's total  assets at  the time the  initial commitment  to purchase such
securities  is  made  (see  "Investment  Restrictions").  An  increase  in   the
percentage  of the Fund's  assets committed to  the purchase of  securities on a
"when, as and  if issued" basis  may increase  the volatility of  its net  asset
value. The Investment Manager and the Board of Directors do not believe that the
net  asset  value of  the Fund  will be  adversely affected  by its  purchase of
securities on such basis.  During the fiscal year  ended February 29, 1996,  the
Fund  did not purchase securities on a "when,  as and if issued" basis. The Fund
may also sell securities on a "when,  as and if issued" basis provided that  the
issuance  of  the  security  will  result  automatically  from  the  exchange or
conversion of a security owned by the Fund at the time of sale.
 
PRIVATE PLACEMENTS
 
    The Fund may invest  up to 5%  of its total assets  in securities which  are
subject  to restrictions on  resale because they have  not been registered under
the Securities  Act of  1933, as  amended, or  which are  otherwise not  readily
marketable.  These securities are generally referred to as private placements or
restricted securities. Limitations on the resale of such securities may have  an
adverse  effect on their marketability, and  may prevent the Fund from disposing
of them promptly at reasonable prices. The Fund may have to bear the expense  of
registering  such securities  for resale and  the risk of  substantial delays in
effecting such registration.
 
    The Securities and Exchange Commission has recently adopted Rule 144A  under
the  Securities  Act of  1933, which  will  permit the  Fund to  sell restricted
securities to qualified  institutional buyers without  limitation. The Board  of
Directors  of the  Fund will make  a determination  as to the  liquidity of each
restricted  security  purchased  by  the  Fund.  If  a  restricted  security  is
determined  to  be  "liquid," such  security  will  not be  included  within the
category "illiquid securities," which under current policy may not exceed 15% of
the Fund's total  assets. The  Rule 144A  marketplace of  sellers and  qualified
institutional  buyers is new and still developing  and may take a period of time
to develop into a mature liquid market. As such, the market for certain  private
placements  purchased  pursuant to  Rule  144A may  be  initially small  or may,
subsequent to purchase, become illiquid. Furthermore, the Investment Manager may
not be possessed of all the  information concerning an issue of securities  that
it wishes to purchase in a private placement to which it would normally have had
access,  had the registration  statement necessitated by  a public offering been
filed with the Securities and Exchange Commission. During the fiscal year  ended
February 29, 1996, the Fund did not purchase any restricted securities.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    In addition to the investment restrictions enumerated in the Prospectus, the
investment   restrictions  listed  below  have  been  adopted  by  the  Fund  as
fundamental  policies,  except  as  otherwise   indicated.  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.  Such  a
majority  is defined as the lesser of (a) 67% or more of the shares present at a
meeting of shareholders  of the Fund,  if the holders  of more than  50% of  the
outstanding  shares are present or represented by proxy; or (b) more than 50% of
the outstanding shares of the Fund. For purposes of the following  restrictions:
(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.
 
                                       22
<PAGE>
    The Fund may not:
 
          1.  Invest in  securities of any  issuer if, to  the knowledge of  the
    Fund,  any officer or director of the Fund or of the Investment Manager owns
    more than 1/2 of 1% of the  outstanding securities of such issuer, and  such
    officers and directors who own more than 1/2 of 1% own in the aggregate more
    than 5% of the outstanding securities of such issuer.
 
          2.    Purchase or  sell real  estate  or interests  therein (including
    limited partnership interests), although the Fund may purchase securities of
    issuers which  engage in  real estate  operations and  securities which  are
    secured by real estate or interests therein.
 
          3.  Purchase or sell commodities except that the Fund may purchase and
    sell futures contracts and related options.
 
          4.    Purchase oil,  gas or  other mineral  leases, rights  or royalty
    contracts or exploration or development  programs, except that the Fund  may
    invest  in the securities of companies  which operate, invest in, or sponsor
    such programs.
 
          5.   Purchase  securities of  other  investment companies,  except  in
    connection  with a  merger, consolidation, reorganization  or acquisition of
    assets.
 
          6.  Borrow  money, except that  the Fund  may borrow from  a bank  for
    temporary  or emergency purposes  in amounts not exceeding  5% (taken at the
    lower of  cost or  current value)  of its  total assets  (not including  the
    amount borrowed).
 
          7.   Pledge its assets or assign  or otherwise encumber them except to
    secure borrowings effected within the  limitations set forth in  restriction
    (6).  (To meet the requirements of  regulations in certain states, the Fund,
    as a matter of operating policy but not as a fundamental policy, will  limit
    any  pledge of its assets to 4.5% of its net assets so long as shares of the
    Fund are being sold in those states.) For the purposes of this  restriction,
    collateral   arrangements  with  respect  to  the  writing  of  options  and
    collateral arrangements  with respect  to initial  or variation  margin  for
    futures are not deemed to be pledges of assets.
 
          8.   Issue senior securities  as defined in the  Act except insofar as
    the Fund may be deemed  to have issued a senior  security by reason of:  (a)
    entering  into any repurchase  agreement; (b) borrowing  money in accordance
    with restrictions described above; or (c) lending portfolio securities.
 
          9.  Make loans of money or securities, except: (a) by the purchase  of
    debt obligations in which the Fund may invest consistent with its investment
    objective  and policies; (b) by investment  in repurchase agreements; or (c)
    by lending its portfolio securities.
 
         10.  Make short sales of securities.
 
         11.  Purchase securities on margin, except for such short-term loans as
    are necessary for the  clearance of purchases  of portfolio securities.  The
    deposit  or payment by the Fund of initial or variation margin in connection
    with futures  contracts or  related options  thereon is  not considered  the
    purchase of a security on margin.
 
         12.   Engage in  the underwriting of securities,  except insofar as the
    Fund may  be deemed  an underwriter  under  the Securities  Act of  1933  in
    disposing  of a portfolio security and then  only in an aggregate amount not
    to exceed 5% of the Fund's total assets.
 
         13.  Invest for the purpose of exercising control or management of  any
    other issuer.
 
    In  addition, the  Fund, as a  non-fundamental policy, will  not invest more
than 5% of the value of its net  assets in warrants, including not more than  2%
of  such  assets  in warrants  not  listed on  the  New York  or  American Stock
Exchange. However, the acquisition of  warrants attached to other securities  is
not subject to this restriction.
 
                                       23
<PAGE>
PORTFOLIO TRANSACTIONS AND BROKERAGE
- --------------------------------------------------------------------------------
 
    Subject to the general supervision of the Board of Directors, the Investment
Manager  is responsible for decisions  to buy and sell  securities for the Fund,
the selection  of  brokers and  dealers  to  effect the  transactions,  and  the
negotiation  of brokerage commissions, if any. Purchases and sales of securities
on a stock  exchange are effected  through brokers who  charge a commission  for
their  services. In the over-the-counter market, securities are generally traded
on a "net" basis with dealers acting as principal for their own accounts without
a stated  commission, although  the price  of the  security usually  includes  a
profit to the dealer. The Fund also expects that securities will be purchased at
times  in  underwritten offerings  where the  price includes  a fixed  amount of
compensation, generally referred to as the underwriter's concession or discount.
Options and futures transactions will usually be effected through a broker and a
commission will be  charged. On  occasion, the  Fund may  also purchase  certain
money  market instruments directly from an  issuer, in which case no commissions
or discounts are paid.  For the fiscal years  ended February 28, 1994,  February
28,  1995 and February 29, 1996, the Fund paid a total of $439,781, $373,465 and
$270,398, respectively, in brokerage commissions.
 
    The Investment Manager currently serves as investment manager or adviser  to
a number of clients, including other investment companies, and may in the future
act  as  investment manager  or adviser  to others.  It is  the practice  of the
Investment Manager to cause purchase and sale transactions to be allocated among
the Fund  and  others  whose assets  it  manages  in such  manner  as  it  deems
equitable.  In making such allocations among the Fund and other client accounts,
the various  factors  may be  considered,  including the  respective  investment
objectives,  the relative size  of portfolio holdings of  the same or comparable
securities, the  availability of  cash for  investment, the  size of  investment
commitments  generally  held and  the opinions  of  the persons  responsible for
managing the portfolios of the  Fund and other client  accounts. In the case  of
certain  initial  and secondary  public  offerings, the  Investment  Manager may
utilize a  pro-rata  allocation based  on  the size  of  the Dean  Witter  Funds
involved and the number of shares available from the public offering.
 
    The  policy of the Fund regarding purchases  and sales of securities for its
portfolio is that  primary consideration  will be  given to  obtaining the  most
favorable  prices and efficient executions of transactions. Consistent with this
policy, when  securities transactions  are  effected on  a stock  exchange,  the
Fund's  policy is  to pay commissions  which are considered  fair and reasonable
without necessarily determining that the lowest possible commissions are paid in
all circumstances.  The Fund  believes that  a requirement  always to  seek  the
lowest  possible commission cost could impede effective portfolio management and
preclude the Fund and  the Investment Manager from  obtaining a high quality  of
brokerage  and research services. In seeking  to determine the reasonableness of
brokerage commissions paid  in any  transaction, the  Investment Manager  relies
upon  its experience  and knowledge  regarding commissions  generally charged by
various brokers and  on its judgment  in evaluating the  brokerage and  research
services received from the broker effecting the transaction. Such determinations
are necessarily subjective and imprecise, as in most cases an exact dollar value
for those services is not ascertainable.
 
    In  seeking to implement the Fund's policies, the Investment Manager effects
transactions with those brokers and dealers who the Investment Manager  believes
provide  the  most  favorable  prices and  are  capable  of  providing efficient
executions. If  the Investment  Manager believes  such price  and execution  are
obtainable  from more than  one broker or  dealer, it may  give consideration to
placing portfolio transactions with those  brokers and dealers who also  furnish
research and other services to the Fund or the Investment Manager. Such services
may  include,  but  are  not limited  to,  any  one or  more  of  the following:
information  as  to  the  availability  of  securities  for  purchase  or  sale;
statistical  or factual information  or opinions pertaining  to investment; wire
services; and  appraisals or  evaluations of  portfolio securities.  During  the
fiscal  year ended February 29, 1996, the  Fund directed the payment of $165,793
in brokerage commissions in connection with transactions in the aggregate amount
of $27,798,999 to brokers because of research services provided.
 
    Consistent with  the  policy  described  above,  brokerage  transactions  in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected  through DWR. In order for DWR to effect any portfolio transactions for
the Fund, the commissions,  fees or other remuneration  received by DWR must  be
reasonable and fair compared to the commissions, fees or other remuneration paid
to other brokers in connection with
 
                                       24
<PAGE>
comparable  transactions involving similar securities being purchased or sold on
an exchange during a comparable period of time. This standard would allow DWR to
receive no more than the remuneration which would be expected to be received  by
an  unaffiliated broker in a commensurate arm's-length transaction. Furthermore,
the Directors of the  Fund, including a  majority of the  Directors who are  not
"interested" persons of the Fund, as defined in the Act, have adopted procedures
which  are reasonably  designed to provide  that any commissions,  fees or other
remuneration paid to DWR are consistent with the foregoing standard. During  the
fiscal  years ended February 28, 1994, February  28, 1995 and February 29, 1996,
the Fund  paid  a  total  of $52,240,  $84,230  and  $88,566,  respectively,  in
brokerage  commissions to DWR.  The Fund does  not reduce the  management fee it
pays to the Investment Manager by any amount of the brokerage commissions it may
pay to DWR. During the year  ended February 29, 1996, the brokerage  commissions
paid  to DWR represented approximately 32.75% of the total brokerage commissions
paid by the Fund during the year and were paid on account of transactions having
an aggregate dollar value equal to approximately 42.45% of the aggregate  dollar
value  of  all portfolio  transactions of  the  Fund during  the year  for which
commissions were paid.
 
    Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect principal transactions in certain money market instruments with DWR.  The
Fund  will limit  its transactions  with DWR  to U.S.  Government and Government
Agency Securities,  Bank Money  Instruments (i.e.  Certificates of  Deposit  and
Bankers'  Acceptances) and Commercial Paper.  Such transactions will be effected
with DWR only when the  price available from DWR  is better than that  available
from other dealers. During its fiscal year ended February 29, 1996, the Fund did
not effect any principal transactions with DWR.
 
    The information and services received by the Investment Manager from brokers
and  dealers may be  of benefit to  the Investment Manager  in the management of
accounts of some of its other clients and may not in all cases benefit the  Fund
directly.  While  the receipt  of  such information  and  services is  useful in
varying degrees and would  generally reduce the amount  of research or  services
otherwise  performed by the Investment Manager  and thereby reduce its expenses,
it is of indeterminable value and the Fund does not reduce the management fee it
pays to the Investment  Manager by any  amount that may  be attributable to  the
value of such services.
 
PORTFOLIO TRADING
 
    It  is anticipated that  the Fund's portfolio turnover  rate will not exceed
100% during the fiscal year ending February 28, 1997. A 100% turnover rate would
occur, for  example, if  100% of  the securities  held in  the Fund's  portfolio
(excluding all securities whose maturities at acquisition were one year or less)
were  sold and replaced within one year.  During the fiscal years ended February
28, 1995 and February 29, 1996, the Fund's portfolio turnover rates were 59% and
49%, respectively.
 
THE DISTRIBUTOR
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, shares  of the Fund are distributed by  Dean
Witter Distributors Inc. (the "Distributor"). The Distributor has entered into a
selected  dealer agreement  with DWR, which  through its  own sales organization
sells shares of the Fund. In  addition, the Distributor may enter into  selected
dealer  agreements  with  other  selected  broker-dealers.  The  Distributor,  a
Delaware corporation,  is  an  indirect wholly-owned  subsidiary  of  DWDC.  The
Directors  of the Fund, including  a majority of the  Directors who are not, and
were not at the time they voted,  interested persons of the Fund, as defined  in
the  Act  (the  "Independent Directors"),  approved,  at their  meeting  held on
October 30,  1992,  a  Distribution  Agreement  (the  "Distribution  Agreement")
appointing  the  Distributor  exclusive  distributor of  the  Fund's  shares and
providing for the  Distributor to bear  distribution expenses not  borne by  the
Fund.  The Distribution Agreement took effect on June 30, 1993 upon the spin-off
by Sears, Roebuck  & Co.  of its  remaining shares of  DWDC. By  its terms,  the
Distribution  Agreement has an initial term  ending April 30, 1994, and provides
that it will remain in  effect from year to year  thereafter if approved by  the
Board.  At their  meeting held  on April  17, 1996,  the Directors,  including a
majority  of  the  Independent  Directors,  approved  the  continuation  of  the
Distribution Agreement until April 30, 1997.
 
                                       25
<PAGE>
    The  Distributor bears all expenses it may incur in providing services under
the Distribution Agreement. Such expenses include the payment of commissions for
sales of the Fund's shares and incentive compensation to account executives. The
Distributor also pays certain  expenses in connection  with the distribution  of
the  Fund's shares, including the costs  of preparing, printing and distributing
advertising or promotional materials, and the costs of printing and distributing
prospectuses and supplements thereto  used in connection  with the offering  and
sale  of the  Fund's shares.  The Fund bears  the costs  of initial typesetting,
printing and distribution of prospectuses and supplements thereto to prospective
shareholders. The Fund  also bears  the costs of  registering the  Fund and  its
shares  under federal  and state securities  laws. The Fund  and the Distributor
have agreed  to  indemnify each  other  against certain  liabilities,  including
liabilities under the Securities Act of 1933, as amended. Under the Distribution
Agreement,  the Distributor uses  its best efforts in  rendering services to the
Fund, but in the absence of willful misfeasance, bad faith, gross negligence  or
reckless disregard of its obligations, the Distributor is not liable to the Fund
or  any of its shareholders for any error  of judgement or mistake of law or for
any act or omission or for any losses sustained by the Fund or its shareholders.
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act (the "Plan"), pursuant to which  the Fund pays the Distributor  compensation
accrued  daily and payable monthly at the annual  rate of 1.0% of the lesser of:
(a) the  average daily  aggregate gross  sales of  the Fund's  shares since  the
inception  of the Plan on July 2, 1984 (not including reinvestments of dividends
or capital  gains distributions),  less the  average daily  aggregate net  asset
value  of the  Fund's shares  redeemed since the  Plan's inception  upon which a
contingent deferred sales charge has been imposed or upon which such charge  has
been  waived, or (b) the  Fund's average daily net  assets. The Distributor also
receives the proceeds of  contingent deferred sales  charges imposed on  certain
redemptions  of shares, which are separate and apart from payments made pursuant
to the  Plan (see  "Redemptions  and Repurchases  -- Contingent  Deferred  Sales
Charge" in the Prospectus). The Distributor has informed the Fund that it and/or
DWR  received  approximately  $143,000,  $177,000  and  $184,694  in  contingent
deferred sales charges for  the fiscal years ended  February 28, 1994,  February
28,  1995 and February 29, 1996, respectively, none of which was retained by the
Distributor.
 
    The Distributor has informed the Fund that a portion of the fees payable  by
the  Fund each year  pursuant to the Plan  equal to 0.25%  of the Fund's average
daily net assets, is characterized  as a "service fee  under" the Rules of  Fair
Practice  of  the  National  Association of  Securities  Dealers  (of  which the
Distributor is a member). Such portion of the fee is a payment made for personal
service and/or the maintenance of shareholder accounts. The remaining portion of
the Plan of Distribution fee  payments made by the  Fund is characterized as  an
"asset-based  sales  charge"  pursuant  to  the  aforementioned  Rules  of  Fair
Practice. At their meeting held on October 26, 1995, the Directors of the  Fund,
including  all of the Independent 12b-1  Directors, approved an amendment to the
Plan to  permit payments  to be  made under  the Plan  with respect  to  certain
distribution  expenses incurred in  connection with the  distribution of shares,
including personal services  to shareholders  with respect to  holdings of  such
shares,  of an  investment company whose  assets are  acquired by the  Fund in a
tax-free reorganization.
 
    The Plan  was  originally  adopted  by  a majority  vote  of  the  Board  of
Directors,  including all of  the Directors who are  not "interested persons" of
the Fund, as defined in the Act, (the "Independent Directors") none of whom  had
or  have any direct or indirect financial  interest in the operation of the Plan
(the "Independent 12b-1 Directors"), cast in person at a meeting called for  the
purpose  of  voting on  the Plan,  on April  16, 1984,  and by  the shareholders
holding a majority,  as defined in  the Act,  of the outstanding  shares of  the
Fund, at the Fund's Annual Meeting of Stockholders held on June 22, 1984.
 
    At  their  meeting held  on October  30,  1992, the  Directors of  the Fund,
including all of the Independent 12b-1 Directors, approved certain amendments to
the Plan which took  effect in January,  1993 and were  designed to reflect  the
fact  that  upon  the  reorganization described  above,  the  share distribution
activities theretofore  performed  for the  Fund  by  DWR were  assumed  by  the
Distributor  and DWR's sales activities are  now being performed pursuant to the
terms of  a selected  dealer  agreement between  the  Distributor and  DWR.  The
amendments  provide that payments under the Plan will be made to the Distributor
rather than to DWR as
 
                                       26
<PAGE>
before the amendment,  and that the  Distributor in turn  is authorized to  make
payments to DWR, its affiliates or other selected broker-dealers (or direct that
the  Fund pay  such entities  directly). The  Distributor is  also authorized to
retain part  of  such  fee  as compensation  for  its  own  distribution-related
expenses.
 
    Pursuant  to the Plan, and as required  by Rule 12b-1, the Distributor shall
provide the Fund, for review by  the Directors, and the Directors shall  review,
at  least quarterly, a written report of the amounts expended under the Plan and
the purpose for which such expenditures  were made. The Fund accrued  $1,369,150
to the Distributor, pursuant to the Plan, for the fiscal year ended February 29,
1996.  This is an accrual at an annual rate of 1% of the average daily aggregate
gross sales of the Fund's shares  issued, net of related shares redeemed,  since
the implementation of the Plan.
 
    The  Plan was adopted  in order to  permit the implementation  of the Fund's
method of distribution. Under  this distribution method shares  of the Fund  are
sold  without a sales load  being deducted at the time  of purchase, so that the
full amount of an investor's purchase payment will be invested in shares without
any deduction  for  sales charges.  Shares  of the  Fund  may be  subject  to  a
contingent deferred sales charge, payable to the Distributor, if redeemed during
the  six years after  their purchase. DWR compensates  its account executives by
paying them, from its own funds, commissions for the sale of the Fund's  shares,
currently  a gross sales  credit of up  to 5% of  the amount sold  and an annual
residual commission of up to .25 of 1%  of the current value of the amount  sold
(not  including reinvested dividends and  distributions). The gross sales credit
is a charge which reflects commissions paid by DWR to its account executives and
DWR's   Fund   associated   distribution-related   expenses,   including   sales
compensation  and overhead. The  distribution fee that  the Distributor receives
from the Fund under the Plan, in effect, offsets distribution expenses  incurred
on  behalf of  the Fund  and DWR's  opportunity costs,  such as  the gross sales
credit and  an  assumed interest  charge  thereon ("carrying  charge").  In  the
Distributor's  reporting  of distribution  expenses  to the  Fund,  such assumed
interest (computed at the "broker's call rate") has been calculated on the gross
sales credit as it is reduced by  amounts received by the Distributor under  the
Plan  and any contingent deferred sales charges received by the Distributor upon
redemption of shares  of the Fund.  No other  interest charge is  included as  a
distribution  expense in the Distributor's calculation of its distribution costs
for this  purpose.  The broker's  call  rate is  the  interest rate  charged  to
securities brokers on loans secured by exchange-listed securities.
 
    The  Fund paid 100% of the $1,369,150  accrued under the Plan for the fiscal
year ended February 29, 1996 to the Distributor and DWR. The Distributor and DWR
estimate that they have  spent, pursuant to the  Plan, $21,460,579 on behalf  of
the  Fund since the inception of the Plan.  It is estimated that this amount was
spent  in  approximately  the  following   ways:  (i)  12.38%  ($2,657,640)   --
advertising  and  promotional expenses;  (ii)  1.46% ($312,369)  --  printing of
prospectuses for  distribution to  other than  current shareholders;  and  (iii)
86.16% ($18,490,570) -- other expenses, including the gross sales credit and the
carrying  charge,  of  which 12.93%  ($2,390,067)  represents  carrying charges,
35.13% ($6,496,553)  represents commission  credits to  DWR branch  offices  for
payments of commissions to account executives and 51.94% ($9,603,950) represents
overhead and other branch office distribution-related expenses.
 
    At  any given time, the  expenses of distributing shares  of the Fund may be
more or less than the total of (i) the payments made by the Fund pursuant to the
Plan and  (ii)  the  proceeds  of contingent  deferred  sales  charges  paid  by
investors  upon redemption of shares. The  Distributor has advised the Fund that
the excess  distribution expenses,  including the  carrying charge  designed  to
approximate  the opportunity  costs incurred by  DWR which arise  from it having
advanced monies without having received the amount of any sales charges  imposed
at the time of sale of the Fund's shares, totalled $5,194,326 as of February 29,
1996,  which amount  constitutes 3.40%  of the Fund's  net assets  on such date.
Because there  is  no  requirement  under  the  Plan  that  the  Distributor  be
reimbursed  for all its 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 by the Distributor 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
Directors will consider at that time the manner in which to treat such expenses.
Any cumulative expenses  incurred, but  not yet  recovered through  distribution
fees  or contingent deferred sales charges, may  or may not be recovered through
future distribution fees or contingent deferred sales charges.
 
                                       27
<PAGE>
    No interested person of the Fund nor any Director of the Fund who is not  an
interested person of the Fund, as defined in the Act, had any direct or indirect
financial  interest in the operation  of the Plan except  to the extent that the
Distributor, InterCapital, DWR or  certain of their employees  may be deemed  to
have such interest as a result of benefits derived from the successful operation
of  the Plan  or as  a result  of receiving  a portion  of the  amounts expended
thereunder by the Fund.
 
    Under its  terms,  the Plan  will  continue in  effect  from year  to  year,
provided such continuance is approved annually by a vote of the Directors in the
manner  described above. Continuance of  the Plan for one  year, until April 30,
1997, was approved by the Board of  Directors of the Fund, including a  majority
of  the Independent 12b-1 Directors, at a  Board meeting held on April 17, 1996.
At that  meeting,  the  Directors of  the  Fund,  including a  majority  of  the
Independent  12b-1 Directors, also approved  certain technical amendments to the
Plan in connection with recent amendments adopted by the National Association of
Securities Dealers  to  its Rules  of  Fair  Practice. Prior  to  approving  the
continuation of the Plan, the Board requested and received from DWR and reviewed
all  the  information  which  it  deemed  necessary  to  arrive  at  an informed
determination. In making their determination to continue the Plan, the Directors
considered: (1) the Fund's experience under the Plan and whether such experience
indicates that the Plan is operating  as anticipated; (2) the benefits the  Fund
had  obtained, was obtaining and  would be likely to  obtain under the Plan; and
(3) what services had been provided and were continuing to be provided under the
Plan by  the Distributor  to the  Fund and  its stockholders.  Based upon  their
review,  the  Directors of  the Fund,  including each  of the  Independent 12b-1
Directors, determined  that  continuation of  the  Plan  would be  in  the  best
interest  of the Fund  and would have  a reasonable likelihood  of continuing to
benefit the Fund and its shareholders. In the Directors' quarterly review of the
Plan, they  will  consider  its  continued  appropriateness  and  the  level  of
compensation provided therein.
 
    The  Plan may not be  amended to increase materially  the amount to be spent
for the services described therein without  approval of the shareholders of  the
Fund,  and all  material amendments  of the  Plan must  also be  approved by the
Directors in the manner described above. The Plan may be terminated at any time,
without payment of any penalty, by vote  of a majority of the Directors who  are
not  interested persons of the Fund and who have no direct or indirect financial
interest in  the operation  of the  Plan, or  by a  vote of  a majority  of  the
outstanding  voting securities of the  Fund (as defined in  the Act) on not more
than thirty days' written notice to any other party to the Plan. So long as  the
Plan is in effect, the election and nomination of Independent Directors shall be
committed to the discretion of the Independent Directors.
 
DETERMINATION OF NET ASSET VALUE
 
    The  net asset value per share of the  Fund is determined once daily at 4:00
p.m., New York time (or, on days  when the New York Stock Exchange closes  prior
to  4 p.m., at such earlier time), on  each day that the New York Stock Exchange
is open  by  taking  the value  of  all  assets of  the  Fund,  subtracting  its
liabilities,  dividing by the number of  shares outstanding and adjusting to the
nearest cent.  The New  York  Stock Exchange  currently observes  the  following
holidays:   New  Year's  Day,  Presidents'   Day,  Good  Friday,  Memorial  Day,
Independence Day, Labor Day, Thanksgiving Day, and Christmas Day.
 
    As stated  in  the Prospectus,  short-term  debt securities  with  remaining
maturities  of 60 days or  less at the time of  purchase are valued at amortized
cost, unless  the Directors  determine  such does  not reflect  the  securities'
market  value, in which case these securities will be valued at their fair value
as determined by the Trustees. Other  short-term debt securities will be  valued
on  a mark-to-market basis until such time as they reach a remaining maturity of
60 days, whereupon they will  be valued at amortized  cost using their value  on
the  61st  day  unless  the  Directors  determine  such  does  not  reflect  the
securities' market value, in which case these securities will be valued at their
fair value as determined by the Directors. Listed options on debt securities are
valued at the latest sale price on the exchange on which they are listed  unless
no  sales of such options have taken place  that day, in which case they will be
valued at the mean between their  latest bid and asked prices. Unlisted  options
on  debt securities and all options on  equity securities are valued at the mean
between their latest bid and asked prices. Futures are valued at the latest sale
price on  the commodities  exchange on  which they  trade unless  the  Directors
determine that such price does not reflect their market
 
                                       28
<PAGE>
value,  in which case they  will be valued at their  fair value as determined by
the Directors. All other  securities and other assets  are valued at their  fair
value  as determined in good faith under procedures established by and under the
supervision of the Directors.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    Upon the purchase of shares of the Fund, a Shareholder Investment Account is
opened for the investor on the books  of the Fund and maintained by Dean  Witter
Trust  Company (the "Transfer Agent").  This is an open  account in which shares
owned by the investor are credited by the Transfer Agent in lieu of issuance  of
a  stock certificate. If a stock certificate is desired, it must be requested in
writing for each transaction. Certificates are  issued only for full shares  and
may  be  redeposited in  the account  at any  time.  There is  no charge  to the
investor for  issuance  of  a certificate.  Whenever  a  shareholder  instituted
transaction  takes place in the  Shareholder Investment Account, the shareholder
will be mailed a written confirmation of  the transaction from the Fund or  from
DWR or other broker-dealer.
 
    AUTOMATIC  INVESTMENT  OF DIVIDENDS  AND DISTRIBUTIONS.    As stated  in the
Prospectus,  all   income  dividends   and  capital   gains  distributions   are
automatically  paid  in  full and  fractional  shares  of the  Fund,  unless the
shareholder requests that they be paid in  cash. Each purchase of shares of  the
Fund is made upon the condition that the Transfer Agent is thereby automatically
appointed  as agent of the  investor to receive all  dividends and capital gains
distributions on shares owned by the investor. Such dividends and  distributions
will  be paid, at the  net asset value per  share, in shares of  the Fund (or in
cash if the shareholder so requests) as  of the close of business on the  record
date.  At any time  an investor may  request the Transfer  Agent, in writing, to
have subsequent dividends and/or capital gains distributions paid to him or  her
in  cash rather than  shares. To assure  sufficient time to  process the change,
such request should  be received by  the Transfer Agent  at least five  business
days  prior to the record  date of the dividend or  distribution. In the case of
recently purchased  shares for  which registration  instructions have  not  been
received on the record date, cash payments will be made to DWR or other selected
broker-dealer,  and will  be forwarded to  the shareholder, upon  the receipt of
proper instructions.
 
    TARGETED  DIVIDENDS.-TM-    In  states  where  it  is  legally  permissible,
shareholders  may also have all income dividends and capital gains distributions
automatically invested in shares of an open-end Dean Witter Fund other than Dean
Witter Natural Resource Development Securities. Such investment will be made  as
described above for automatic investment in shares of the Fund, at the net asset
value  per share of the selected Dean Witter Fund as of the close of business on
the payment  date  of  the dividend  or  distribution  and will  begin  to  earn
dividends,  if any, in the  selected Dean Witter Fund  the next business day. To
participate in the Targeted Dividends program, shareholders should contact their
DWR or other  selected broker-dealer  account executive of  the Transfer  Agent.
Shareholders  of the Fund must be shareholders  of the Dean Witter Fund targeted
to receive  investments from  dividends  at the  time  they enter  the  Targeted
Dividends  program. Investors should review the  prospectus of the targeted Dean
Witter Fund before entering the program.
 
    EASYINVEST.-TM-   Shareholders may  subscribe  to EasyInvest,  an  automatic
purchase  plan  which  provides  for  any  amount  from  $100  to  $5,000  to be
transferred automatically from a checking or savings account, on a semi-monthly,
monthly or quarterly basis,  to the Transfer Agent  for investment in shares  of
the Fund. Shares purchased through EasyInvest will be added to the shareholder's
existing  account at the  net asset value  calculated the same  business day the
transfer of  funds is  effected.  For further  information  or to  subscribe  to
EasyInvest,   shareholders   should  contact   their   DWR  or   other  selected
broker-dealer account executive or the Transfer Agent.
 
    INVESTMENT OF DIVIDENDS OR DISTRIBUTIONS RECEIVED IN CASH.  Any  shareholder
who  receives a cash payment representing  a dividend or distribution may invest
such dividend or distribution at net asset  value by returning the check or  the
proceeds to the Transfer Agent within thirty days after the payment date. If the
shareholder  returns the proceeds of a dividend or distribution, such funds must
be accompanied by a signed statement  indicating that the proceeds constitute  a
dividend or distribution to be invested. Such investment will be made at the net
asset  value per share next determined after receipt of the check or proceeds by
the Transfer Agent.
 
                                       29
<PAGE>
    SYSTEMATIC WITHDRAWAL PLAN.   As discussed in  the Prospectus, a  withdrawal
plan  (the "Withdrawal Plan") is available  for shareholders who own or purchase
shares of the Fund having a minimum value of $10,000 based upon the then current
net asset value. The Withdrawal Plan  provides for monthly or quarterly  (March,
June, September and December) checks in any dollar amount, not less than $25, or
in  any whole  percentage of  the account balance,  on an  annualized basis. Any
applicable contingent deferred sales charge  will be imposed on shares  redeemed
under  the  Withdrawal  Plan  (see "Redemptions  and  Repurchases  -- Contingent
Deferred  Sales  Charge"   in  the  Prospectus).   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  contingent
deferred  sales charge)  to the  shareholder will  be the  designated monthly or
quarterly amount.
 
    The Transfer Agent  acts as agent  for the shareholder  in tendering to  the
Fund  for redemption sufficient full and fractional shares to provide the amount
of the periodic  withdrawal payment  designated in the  application. The  shares
will  be  redeemed at  their net  asset value  determined, at  the shareholder's
option, on the tenth or twenty-fifth day (or next following business day) of the
relevant month or quarter and normally a  check for the proceeds will be  mailed
by  the Transfer  Agent, or  amounts credited  to a  shareholder's DWR  or other
broker-dealer brokerage account,  within five  business days after  the date  of
redemption. The Withdrawal Plan may be terminated at any time by the Fund.
 
    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.  Although the
shareholder may  make  additional  investments  of  $2,500  or  more  under  the
Withdrawal  Plan,  withdrawals made  concurrently  with purchases  of additional
shares may  be  inadvisable because  of  the contingent  deferred  sales  charge
applicable  to the redemption of shares purchased during the preceding six years
(see "Redemptions and Repurchases -- Contingent Deferred Sales Charge").
 
    Any shareholder who wishes to have  payments under the Withdrawal Plan  made
to  a third party or sent to an address other than the one listed on the account
must send complete written instructions to  the Transfer Agent to enroll in  the
Withdrawal  Plan.  The  shareholder's  signature on  such  instructions  must be
guaranteed  by  an   eligible  guarantor  acceptable   to  the  Transfer   Agent
(shareholders  should  contact  the Transfer  Agent  for a  determination  as to
whether a particular institution is  such an eligible guarantor). A  shareholder
may,  at any time, change the amount and interval of withdrawal payments through
his or her account executive or  by written notification to the Transfer  Agent.
In  addition, the  party and/or the  address to  which checks are  mailed may be
changed by written notification to the Transfer Agent, with signature guarantees
required in the manner described above.  The shareholder may also terminate  the
Withdrawal  Plan at  any time by  written notice  to the Transfer  Agent. In the
event  of  such  termination,  the  account  will  be  continued  as  a  regular
shareholder  investment account. The shareholder may  also redeem all or part of
the  shares  held  in  the   Withdrawal  Plan  account  (see  "Redemptions   and
Repurchases") at any time.
 
    DIRECT  INVESTMENTS THROUGH TRANSFER AGENT.  As discussed in the Prospectus,
a shareholder may  make additional  investments in Fund  shares at  any time  by
sending  a  check in  any amount,  not less  than $100,  payable to  Dean Witter
Natural Resource Development  Securities Inc., directly  to the Fund's  Transfer
Agent.  Such amounts will be  applied to the purchase of  Fund shares at the net
asset value  per share  next computed  after receipt  of the  check or  purchase
payment  by the Transfer Agent. The shares  so purchased will be credited to the
investor's account.
 
EXCHANGE PRIVILEGE
 
    As discussed in the Prospectus, the Fund makes available to its shareholders
an Exchange Privilege whereby shareholders of the Fund may exchange their shares
for shares of  other Dean  Witter Funds sold  with a  contingent deferred  sales
charge  ("CDSC funds"), and  for shares of Dean  Witter Short-Term U.S. Treasury
Trust, Dean Witter Intermediate  Term U.S. Treasury  Trust, Dean Witter  Limited
Term  Municipal Trust,  Dean Witter Short-Term  Bond Fund,  Dean Witter Balanced
Income Fund, Dean Witter Balanced Growth Fund, and
 
                                       30
<PAGE>
for five Dean Witter  Funds which are money  market funds (the foregoing  eleven
non-CDSC  funds  are  hereinafter  collectively  referred  to  as  the "Exchange
Funds"). Exchanges may be made after the shares of the Fund acquired by purchase
(not by exchange or dividend reinvestment) have been held for thirty days. There
is no waiting period  for exchanges of shares  acquired by exchange or  dividend
reinvestment.  An exchange will  be treated for federal  income tax purposes the
same as  a repurchase  or redemption  of shares,  on which  the shareholder  may
realize a capital gain or loss.
 
    Any  new account  established through the  Exchange Privilege  will have the
same registration and cash dividend or dividend reinvestment plan as the present
account,  unless  the  Transfer  Agent  receives  written  notification  to  the
contrary.  For  telephone  exchanges,  the exact  registration  of  the existing
account and the account number must be provided.
 
    Any shares  held  in  certificate  form cannot  be  exchanged  but  must  be
forwarded  to the  Transfer Agent and  deposited into  the shareholder's account
before being eligible for exchange.  (Certificates mailed in for deposit  should
not be endorsed.)
 
    As  described  below, and  in the  Prospectus  under the  captions "Exchange
Privilege" and "Contingent Deferred Sales  Charge," a contingent deferred  sales
charge  ("CDSC") may  be imposed  upon a  redemption, depending  on a  number of
factors, including the number of years from the time of purchase until the  time
of  redemption or exchange  ("holding period"). When  shares of the  Fund or any
other CDSC fund are exchanged  for shares of an  Exchange Fund, the exchange  is
executed  at no charge to the shareholder, without the imposition of the CDSC at
the time of the exchange. During the  period of time the shareholder remains  in
the  Exchange  Fund (calculated  from the  last day  of the  month in  which the
Exchange Fund shares were acquired), the holding period or "year since  purchase
payment made" is frozen. When shares are redeemed out of the Exchange Fund, they
will  be subject  to a CDSC  which would  be based upon  the period  of time the
shareholder held shares in the Fund. However, in the case of shares of the  Fund
exchanged into an Exchange Fund on or after April 23, 1990, upon a redemption of
shares which results in a CDSC being imposed, a credit (not to exceed the amount
of  the  CDSC) will  be given  in an  amount  equal to  the Exchange  Fund 12b-1
distribution fees incurred on or after that date which are attributable to those
shares. Shareholders  acquiring shares  of  an Exchange  Fund pursuant  to  this
exchange  privilege  may  exchange those  shares  back  into the  Fund  from the
Exchange Fund, with no CDSC being  imposed on such exchange. The holding  period
previously  frozen when shares  were first exchanged for  shares of the Exchange
Fund resumes on the  last day of the  month in which shares  of a CDSC fund  are
reacquired.  A CDSC is imposed only upon  an ultimate redemption, based upon the
time (calculated as  described above)  the shareholder  was invested  in a  CDSC
fund.
 
    In  addition, shares of the  Fund may be acquired  in exchange for shares of
Dean Witter Funds sold  with a front-end sales  charge ("front-end sales  charge
funds")  but shares  of the  Fund, however  acquired, may  not be  exchanged for
shares of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired  in
exchange  for shares of a front-end sales charge fund (or in exchange for shares
of other Dean Witter  Funds for which  shares of a  front-end sales charge  fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    When  shares initially purchased in a CDSC  fund are exchanged for shares of
an Exchange Fund, the date of purchase of the shares of the fund exchanged into,
for purposes of the CDSC upon redemption, will  be the last day of the month  in
which  the shares being  exchanged were originally  purchased. In allocating the
purchase payments  between funds  for  purposes of  the  CDSC the  amount  which
represents  the current net  asset value of  shares at the  time of the exchange
which were (i) purchased  more than three  or six years  (depending on the  CDSC
schedule  applicable  to  the shares)  prior  to the  exchange,  (ii) originally
acquired through reinvestment of dividends  or distributions and (iii)  acquired
in  exchange for shares of front-end sales  charge funds, or for shares of other
Dean Witter Funds  for which shares  of front-end sales  charge funds have  been
exchanged  (all  such shares  called "Free  Shares"),  will be  exchanged first.
Shares of Dean Witter American Value Fund (formerly Dean Witter  Industry-Valued
Securities  Inc.) acquired prior to April 30,  1984, shares of the Fund and Dean
Witter Dividend  Growth Securities  Inc. acquired  prior to  July 2,  1984,  and
shares  of Dean Witter Strategist  Fund acquired prior to  November 8, 1989, are
also considered Free Shares and will be  the first Free Shares to be  exchanged.
After   an   exchange,  all   dividends  earned   on   shares  in   an  Exchange
 
                                       31
<PAGE>
Fund will be considered Free Shares.  If the exchanged amount exceeds the  value
of such Free Shares, an exchange is made, on a block-by-block basis, of non-Free
Shares  held for  the longest  period of  time (except  that if  shares held for
identical periods of time  but subject to different  CDSC schedules are held  in
the  same Exchange Privilege account, the shares  of that block that are subject
to a lower CDSC rate  will be exchanged prior to  the shares of that block  that
are  subject to  a higher CDSC  rate). Shares  equal to any  appreciation in the
value of  non-Free Shares  exchanged will  be treated  as Free  Shares, and  the
amount  of the purchase payments  for the non-Free Shares  of the fund exchanged
into will be equal to  the lesser of (a) the  purchase payments for, or (b)  the
current  net  asset value  of,  the exchanged  non-Free  Shares. If  an exchange
between funds would result  in exchange of  only part of  a particular block  of
non-Free Shares, then shares equal to any appreciation in the value of the block
(up  to the amount of the exchange) will be treated as Free Shares and exchanged
first, and the purchase payment for that  block will be allocated on a pro  rata
basis  between the non-Free Shares of that block to be retained and the non-Free
Shares  to  be  exchanged.  The   prorated  amount  of  such  purchase   payment
attributable to the retained non-Free Shares will remain as the purchase payment
for  such shares, and the amount of  purchase payment for the exchanged non-Free
Shares will be equal to  the lesser of (a) the  prorated amount of the  purchase
payment  for, or (b)  the current net  asset value of,  those exchanged non-Free
Shares. Based upon the procedures described in the Prospectus under the  caption
"Contingent Deferred Sales Charge," any applicable CDSC will be imposed upon the
ultimate redemption of shares of any fund, regardless of the number of exchanges
since those shares were originally purchased.
 
    With  respect to  the redemption  or repurchase of  shares of  the Fund, the
application of proceeds to the purchase of  new shares in the Fund or any  other
of  the  funds and  the general  administration of  the Exchange  Privilege, the
Transfer Agent  acts as  agent for  the Distributor  and for  the  shareholder's
selected broker-dealer, if any, in the performance of such functions.
 
    With  respect to exchanges,  redemptions or repurchases,  the Transfer Agent
shall be liable for its own negligence and not for the default or negligence  of
its  correspondents or for losses  in transit. The Fund  shall not be liable for
any default or negligence of the Transfer Agent, the Distributor or any selected
broker-dealer.
 
    The Distributor and any selected broker-dealer have authorized and appointed
the Transfer Agent to act as their  agent in connection with the application  of
proceeds of any redemption of Fund shares to the purchase of shares of any other
fund  and the general administration of the Exchange Privilege. No commission or
discounts will be paid to the Distributor or any selected broker-dealer for  any
transactions pursuant to this Exchange Privilege.
 
    Exchanges  are subject to  the minimum investment  requirement and any other
conditions imposed by each fund. (The  minimum initial investment is $5,000  for
Dean  Witter Liquid  Asset Fund Inc.,  Dean Witter Tax-Free  Daily Income Trust,
Dean Witter New  York Municipal Money  Market Trust and  Dean Witter  California
Tax-Free  Daily  Income Trust  although those  funds  may, at  their discretion,
accept initial investments of as low  as $1,000. The minimum initial  investment
for  Dean Witter Short-Term U.S. Treasury  Trust is $10,000. The minimum initial
investment for all other Dean Witter  Funds for which the Exchange Privilege  is
available  is $1,000.) Upon exchange  into an Exchange Fund,  the shares of that
fund will  be held  in  a special  Exchange  Privilege Account  separately  from
accounts of those shareholders who have acquired their shares directly from that
fund.  As a result, certain services normally available to shareholders of those
funds, including the check writing feature, will not be available for funds held
in that account.
 
    The Fund and each  of the other  Dean Witter Funds may  limit the number  of
times  this  Exchange  Privilege  may  be exercised  by  any  investor  within a
specified period of  time. Also,  the Exchange  Privilege may  be terminated  or
revised  at any time by the  Fund and/or any of the  Dean Witter Funds for which
shares of the Fund have been exchanged,  upon such notice as may be required  by
applicable regulatory agencies (presently sixty days for termination or material
revision), provided that six months' prior written notice of termination will be
given  to the shareholders who  hold shares of Exchange  Funds, pursuant to this
Exchange Privilege  and provided  further  that the  Exchange Privilege  may  be
terminated  or materially revised without notice at  times (a) when the New York
Stock Exchange is  closed for other  than customary weekends  and holidays,  (b)
when  trading on that Exchange is restricted,  (c) when an emergency exists as a
result of which disposal by the Fund of securities owned by it is not reasonably
practicable or it is not reasonably practicable
 
                                       32
<PAGE>
for the Fund fairly  to determine the  value of its net  assets, (d) during  any
other  period when  the Securities and  Exchange Commission by  order so permits
(provided that applicable rules and  regulations of the Securities and  Exchange
Commission  shall govern as to  whether the conditions prescribed  in (b) or (c)
exist) or (e)  if the  Fund would  be unable  to invest  amounts effectively  in
accordance with its investment objective, policies and restrictions.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and  shareholders should obtain  a copy and  examine it  carefully
before  investing. An exchange  will be treated for  federal income tax purposes
the same as a repurchase or redemption  of shares, on which the shareholder  may
realize a capital gain or loss. However, the ability to deduct capital losses on
an  exchange may be limited  in situations where there  is an exchange of shares
within ninety days  after the shares  are purchased. The  Exchange Privilege  is
only available in states where an exchange may legally be made.
 
    For  further  information  regarding  the  Exchange  Privilege, shareholders
should contact their DWR  or other selected  broker-dealer account executive  or
the Transfer Agent.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.  As stated in the Prospectus, shares of the Fund can be redeemed
for  cash at any time at the net asset value per share next determined; however,
such redemption  proceeds  may  be  reduced by  the  amount  of  any  applicable
contingent  deferred  sales  charges  (see  below).  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.
The  share  certificate, or  an accompanying  stock power,  and the  request for
redemption must be  signed by  the shareholder  or shareholders  exactly as  the
shares  are registered. Each request for  redemption, whether or not accompanied
by a share certificate, must  be sent to the  Fund's Transfer Agent, which  will
redeem  the shares at their net asset value next computed (see "Purchase of Fund
Shares" in the Prospectus)  after it receives the  request, and certificate,  if
any,  in good order. Any redemption request received after such computation will
be redeemed at the next determined net asset value. The Term "good order"  means
that  the share  certificate, if  any, and  request for  redemption are properly
signed, accompanied by  any documentation  required by the  Transfer Agent,  and
bear  signature guarantees when required  by the Fund or  the Transfer Agent. If
redemption is requested by a  corporation, partnership, trust or fiduciary,  the
Transfer  Agent may require that written evidence of authority acceptable to the
Transfer Agent be submitted before such request is accepted.
 
    Whether certificates are  held by the  shareholder or shares  are held in  a
shareholder's  account, if the proceeds are to  be paid to any person other than
the record owner, or if the proceeds are to be paid to a corporation (other than
the Distributor or a selected broker-dealer for the account of the shareholder),
partnership, trust or fiduciary, or sent to the shareholder at an address  other
than  the  registered  address, signatures  must  be guaranteed  by  an eligible
guarantor acceptable  to the  Transfer Agent  (shareholders should  contact  the
Transfer  Agent for  a determination as  to whether a  particular institution is
such an eligible guarantor). A  stock power may be  obtained from any dealer  or
commercial  bank. The Fund may change  the signature guarantee requirements from
time to  time upon  notice to  shareholders,  which may  be by  means of  a  new
prospectus.
 
    CONTINGENT DEFERRED SALES CHARGE.  As stated in the Prospectus, a contingent
deferred  sales charge ("CDSC") will be imposed on any redemption by an investor
if after such redemption the current value of the investor's shares of the  Fund
is  less  than the  dollar amount  of all  payments by  the shareholder  for the
purchase of Fund shares during the preceding six years. However, no CDSC will be
imposed to the extent that the net  asset value of the shares redeemed does  not
exceed:  (a) the current net asset value of shares purchased more than six years
prior to  the  redemption,  plus (b)  the  current  net asset  value  of  shares
purchased  through reinvestment  of dividends  or distributions  of the  Fund or
another Dean Witter  Fund (see  "Shareholder Services  -- Targeted  Dividends"),
plus  (c) the  current net asset  value of  shares acquired in  exchange for (i)
shares of Dean Witter front-end sales charge funds, or (ii) shares of other Dean
Witter Funds
 
                                       33
<PAGE>
for which  shares of  front-end  sales charge  funds  have been  exchanged  (see
"Shareholder  Services --  Exchange Privilege"), plus  (d) increases  in the net
asset value of the investor's shares above the total amount of payments for  the
purchase  of Fund shares made  during the preceding six  years. The CDSC will be
paid to the Distributor. In addition, no CDSC will be imposed on redemptions  of
shares  which were purchased by certain Unit Investment Trusts (on which a sales
charge has been paid) or which are attributable to reinvestment of dividends  or
distributions from, or the proceeds of, such Unit Investment Trusts.
 
    In  determining the applicability of the CDSC to each redemption, the amount
which represents an  increase in the  net asset value  of the investor's  shares
above  the amount of  the total payments  for the purchase  of shares within the
last six  years will  be redeemed  first.  In the  event the  redemption  amount
exceeds  such increase in value, the next portion of the amount redeemed will be
the amount  which  represents the  net  asset  value of  the  investor's  shares
purchased  more than six  years prior to the  redemption and/or shares purchased
through reinvestment of  dividends or  distributions and/or  shares acquired  in
exchange  for shares  of Dean  Witter front-end sales  charge funds,  or for the
shares of other  Dean Witter funds  for which shares  of front-end sales  charge
funds  have been exchanged.  A portion of  the amount redeemed  which exceeds an
amount which represents  both such  increase in value  and the  value of  shares
purchased  more than six  years prior to the  redemption and/or shares purchased
through reinvestment of dividends or distributions and/or shares acquired in the
above-described exchanges will be subject to a CDSC.
 
    The amount of the CDSC, if any,  will vary depending on the number of  years
from  the time  of payment  for the purchase  of Fund  shares until  the time of
redemption of such shares. For purposes of determining the number of years  from
the  time of any payment for the purchase  of shares, all payments made during a
month will be aggregated  and deemed to have  been made on the  last day of  the
month. The following table sets forth the rates of the CDSC:
 
<TABLE>
<CAPTION>
                                         CONTINGENT
                                          DEFERRED
            YEAR SINCE                  SALES CHARGE
             PURCHASE                AS A PERCENTAGE OF
           PAYMENT MADE               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  determining the rate of the CDSC it will be assumed that a redemption is
made of shares held by  the investor for the longest  period of time within  the
applicable  six-year period. This will result in  any such CDSC being imposed at
the  lowest  possible  rate.  Accordingly,  shareholders  may  redeem,   without
incurring  any CDSC,  amounts equal to  any net  increase in the  value of their
shares above the  amount of  their purchase payments  made within  the past  six
years  and amounts equal to the current  value of shares purchased more than six
years prior  to the  redemption  and shares  purchased through  reinvestment  of
dividends  or distributions  or acquired in  exchange for shares  of Dean Witter
front-end sales charge funds, or for shares of other Dean Witter Funds for which
shares of front-end  sales charge funds  have been exchanged.  The CDSC will  be
imposed, in accordance with the table shown above, on any redemptions within six
years of purchase which are in excess of these amounts and which redemptions are
not  (a)  requested  within  one  year  of  death  or  initial  determination of
disability  of  a  shareholder,  or   (b)  made  pursuant  to  certain   taxable
distributions  from retirement plans or retirement accounts, as described in the
Prospectus.
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  As discussed in the Prospectus,
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 at times (a) when the New York Stock Exchange is closed for
other than customary weekends and holidays, (b) when trading on that Exchange is
restricted,  (c) when an emergency  exists as a result  of which disposal by the
Fund of  securities owned  by it  is not  reasonably practicable  or it  is  not
 
                                       34
<PAGE>
reasonably  practicable for the  Fund fairly to  determine the value  of its net
assets, or  (d)  during  any  other period  when  the  Securities  and  Exchange
Commission  by order so permits; provided  that applicable rules and regulations
of the  Securities  and Exchange  Commission  shall  govern as  to  whether  the
conditions  prescribed in (b)  or (c) exist.  If the shares  to be redeemed have
recently been  purchased  by check  (including  a certified  or  bank  cashier's
check),  payment  of 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  investment of  the check  by the Transfer
Agent). If  the shares  to be  redeemed have  recently been  purchased by  check
(including  a  certificate  or  bank  cashier's  check),  payment  of 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 investment  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.
 
    TRANSFERS OF SHARES.  In the event a shareholder requests a transfer of  any
shares  to a  new registration,  such shares  will be  transferred without sales
charge at the time of  transfer. With regard to the  status of shares which  are
either  subject to the contingent  deferred sales charge or  free of such charge
(and with regard to the  length of time shares subject  to the charge have  been
held),  any transfer involving less than all of the shares in an account will be
made on a pro-rata basis (that is, by transferring shares in the same proportion
that the transferred shares bear to the total shares in the account  immediately
prior to the transfer). The shares to be transferred will be determined by using
the  same  order  as  used  in processing  a  redemption  (see  "Redemptions and
Repurchases" in  the Prospectus).  The transferred  shares will  continue to  be
subject  to any applicable contingent  deferred sales charge as  if they had not
been so transferred.
 
    REINSTATEMENT PRIVILEGE.  As discussed in the Prospectus, a shareholder  who
has  had  his or  her  shares redeemed  or  repurchased and  has  not previously
exercised this reinstatement  privilege may, within  30 days after  the date  of
redemption  or repurchase, reinstate any portion or  all of the proceeds of such
redemption or repurchase  in shares  of the  Fund at  the net  asset value  next
determined after a reinstatement request is received by the Transfer Agent.
 
    Exercise  of the reinstatement privilege will  not affect the federal income
tax treatment of any  gain or loss realized  upon the redemption or  repurchase,
except that if the redemption or repurchase resulted in a loss and reinstatement
is  made in shares of the Fund, some or all of the loss, depending on the amount
reinstated, will not be allowed as  a deduction for federal income tax  purposes
but  will  be applied  to  adjust the  cost basis  of  the shares  acquired upon
reinstatement.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, the Fund will determine either to distribute
or to retain  all or part  of any net  long-term capital gains  in any year  for
reinvestment.  If any such gains are retained,  the Fund will pay federal income
tax thereon, and shareholders will be able to claim their share of the tax  paid
by the Fund as a credit against their individual federal income tax.
 
    Because  the Fund intends to distribute all of its net investment income and
capital gains to shareholders and otherwise  continue to qualify as a  regulated
investment  company under Subchapter M  of the Internal Revenue  Code, it is not
expected that  the  Fund  will  be  required to  pay  any  federal  income  tax.
Shareholders  will  normally have  to pay  federal income  taxes, and  any state
and/or income taxes, on  the dividends and distributions  they receive from  the
Fund. Such dividends and distributions, to the extent that they are derived from
net   investment  income  or  short-term  capital  gains,  are  taxable  to  the
shareholder as ordinary  income regardless of  whether the shareholder  receives
such  payments in additional  shares or in  cash. Any dividends  declared in the
last quarter of any year which are paid in the following year prior to  February
1 will be deemed received by the shareholder in the prior year.
 
    Gains or losses on sales of securities by the Fund will be long-term capital
gains  or losses if the securities have been  held by the Fund for more than one
year. Gains or losses on the sale of  securities held for one year or less  will
be short-term gains or losses.
 
                                       35
<PAGE>
    The  Fund  has qualified  and  intends to  remain  qualified as  a regulated
investment company under Subchapter M of  the Internal Revenue Code of 1986.  If
so  qualified, the  Fund will not  be subject to  federal income tax  on its net
investment income  and  net short-term  and  long-term capital  gains,  if  any,
realized  during any fiscal year in which it distributes such income and capital
gains to its shareholders. 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.
 
    Dividends  and  interest  received  by  the  Fund  with  respect  to foreign
securities in its portfolio may give rise to withholding and other taxes imposed
by foreign countries. Tax conventions  between certain countries and the  United
States may reduce or eliminate such taxes.
 
    Any  dividend or capital  gains distribution received  by a shareholder from
any investment company will have the effect  of reducing the net asset value  of
the  shareholder's stock in that company by  the exact amount of the dividend or
capital gains distribution.  Furthermore, capital gains  distributions and  some
portion  of the dividends are subject to  federal income taxes. If the net asset
value of the shares should be reduced below a shareholder's cost as a result  of
the  payment  of dividends  or the  distribution  of realized  long-term capital
gains, such payment or distribution would be a return of capital but nonetheless
would be taxable to the shareholder. Therefore, an investor should consider  the
tax  implications of purchasing Fund shares  immediately prior to a distribution
record date.
 
    Dividend payments  will  be  eligible for  the  federal  dividends  received
deduction  available to the Fund's corporate shareholders only to the extent the
aggregate dividends received by the Fund would be eligible for the deduction  if
the  Fund were  the shareholder claiming  the dividends  received deduction. The
amount of  dividends  paid by  the  Fund which  may  qualify for  the  dividends
received  deduction is limited  to the aggregate  amount of qualifying dividends
which the Fund derives from its portfolio investments which the Fund had held to
a minimum period, usually 46 days. Any  distributions made by the Fund will  not
be  eligible for the  dividends received deduction with  respect to shares which
are held by  the shareholder for  45 days  or less. Any  long-term capital  gain
distributions  will also not  be eligible for  the dividends received deduction.
The ability to take the dividends received deduction will also be limited in the
case of  a Fund  shareholder which  incurs or  continues indebtedness  which  is
directly attributable to its investment in the Fund.
 
    After  the end of  the year, shareholders  will be sent  full information on
their dividends  and capital  gains distributions  for tax  purposes,  including
information as to the portion taxable as ordinary income, the portion taxable as
long-term  capital gains  and the  portion eligible  for the  dividends received
deduction. 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 are urged to consult their attorneys or tax advisers  regarding
specific questions as to federal, state or local taxes.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
    As  discussed in the  Prospectus, from time  to time the  Fund may quote its
"total return"  in  advertisements and  sales  literature. The  Fund's  "average
annual total return" represents an annualization of the Fund's total return over
a  particular period and is computed by finding the annual percentage rate which
will result in the ending redeemable  value of a hypothetical $1,000  investment
made  at the beginning of a one, five  or ten year period. The ending redeemable
value is reduced by any contingent deferred sales charge at the end of the  one,
five  or ten year  or other period. For  the purpose of  this calculation, it is
assumed that all  dividends and  distributions are reinvested.  The formula  for
computing  the average  annual total  return involves  a percentage  obtained by
dividing the ending redeemable  value by the amount  of the initial  investment,
taking  a root of  the quotient (where the  root is equivalent  to the number of
years in the period) and subtracting 1 from the result.
 
                                       36
<PAGE>
    The average annual total returns of the Fund for the year ended February 29,
1996, the  five years  ended February  29, 1996,  and for  the ten  years  ended
February 29, 1996, were 19.32%, 8.59% and 11.03%, respectively.
 
    In  addition to the foregoing, the Fund  may advertise its total return 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 the  contingent deferred  sales charge which,  if reflected,  would
reduce the performance quoted. For example, the average total return of the Fund
may  be  calculated in  the  manner described  in  the preceding  paragraph, but
without deduction of any applicable  contingent deferred sales charge. Based  on
this  calculation, the  average annual  total returns of  the Fund  for the year
ended February 29, 1996, for the five years ended February 29, 1996, and for the
ten years ended February 29, 1996 were 24.32%, 8.88% and 11.03%, respectively.
 
    In addition, the Fund may compute  its aggregate total return for  specified
periods  by determining the  aggregate percentage rate which  will result in the
ending value of a  hypothetical $1,000 investment made  at the beginning of  the
period.  For the purpose of  this calculation, it is  assumed that all dividends
and distributions  are reinvested.  The formula  for computing  aggregate  total
return  involves a percentage obtained by dividing the ending value (without the
reduction for  any  contingent deferred  sales  charge) by  the  initial  $1,000
investment   and  subtracting  1  from  the   result.  Based  on  the  foregoing
calculation, the Fund's total  return for the year  ended February 29, 1996  was
24.32%,  the total return for the five years ended February 29, 1996 was 53.02%,
and the total return for the ten years ended February 29, 1996 was 184.79%.
 
    The Fund  may  also advertise  the  growth of  hypothetical  investments  of
$10,000,  $50,000 and $100,000 in  shares of the Fund by  adding 1 to the Fund's
aggregate total return to date (expressed  as a decimal and without taking  into
account  the effect of any applicable  CDSC) and multiplying by $10,000, $50,000
and $100,000.  Investments of  $10,000,  $50,000 and  $100,000  in the  Fund  at
inception  would have grown  to $26,749, $133,745  and $267,490, respectively at
February 29, 1996.
 
    The Fund from time  to time may also  advertise its performance relative  to
certain performance rankings and indexes compiled by independent organizations.
 
SHARES OF THE FUND
- --------------------------------------------------------------------------------
 
    The  Fund is authorized to issue 500,000,000 shares of common stock of $0.01
par value. Shares of the Fund, when issued, are fully paid, nonassessable, fully
transferable and redeemable at the option  of the holder. Except for  agreements
entered  into  by  the  Fund  in its  ordinary  course  of  business  within the
limitations of the Fund's fundamental investment policies (which may be modified
only by shareholder  vote), the Fund  will not issue  any securities other  than
common stock.
 
    The  shares of the  Fund do not  have cumulative voting  rights, which means
that the holders of more than 50% of  the shares voting for the election of  the
directors  can elect 100% of the directors if  they choose to do so, and in such
event, the holders of the remaining shares voting for the election of  directors
will not be able to elect any person or persons to the Board of Directors.
 
CUSTODIAN AND TRANSFER AGENT
- --------------------------------------------------------------------------------
 
    The  Bank of New York, 90 Washington Street, New York, New York 10286 is the
Custodian of  the  Fund's assets.  Any  of the  Fund's  cash balances  with  the
Custodian  in excess of  $100,000 are unprotected  by federal deposit insurance.
Such balances may, at times, be substantial.
 
    Dean Witter Trust  Company, Harborside Financial  Center, Plaza Two,  Jersey
City,  New Jersey 07311 is the Transfer  Agent of the Fund's shares and Dividend
Disbursing Agent for payment of dividends  and distributions on Fund shares  and
Agent  for shareholders  under various  investment plans  described herein. Dean
Witter Trust  Company is  an affiliate  of Dean  Witter InterCapital  Inc.,  the
Fund's  Investment Manager,  and of  Dean Witter  Distributors Inc.,  the Fund's
Distributor. As Transfer Agent and Dividend Disbursing Agent, Dean Witter  Trust
Company's  responsibilities include maintaining  shareholder accounts, including
providing sub-account
 
                                       37
<PAGE>
and recordkeeping  services for  certain  retirement accounts;  disbursing  cash
dividends  and reinvesting  dividends; processing  account registration changes;
handling purchase and redemption transactions; mailing prospectuses and reports;
mailing and tabulating proxies;  processing share certificate transactions;  and
maintaining shareholder records and lists. For these services, Dean Witter Trust
Company receives a per shareholder account fee from the Fund.
 
INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
    Price  Waterhouse LLP, 1177 Avenue of the Americas, New York, New York 10036
serves as the independent accountants  of the Fund. The independent  accountants
are responsible for auditing the annual financial statements of the Fund.
 
REPORTS TO SHAREHOLDERS
- --------------------------------------------------------------------------------
 
    The  Fund will send to shareholders, at least semi-annually, reports showing
the Fund's  portfolio  and  other  information.  An  annual  report,  containing
financial  statements  audited  by  independent  accountants,  will  be  sent to
shareholders each year.
 
    The Fund's  fiscal year  ends on  the last  day of  February. The  financial
statements  of the  Fund must  be audited  at least  once a  year by independent
accountants whose selection is made annually by the Fund's Board of Directors.
 
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
    Sheldon Curtis,  Esq., who  is an  officer and  the General  Counsel of  the
Investment Manager, is an officer and the General Counsel of the Fund.
 
EXPERTS
- --------------------------------------------------------------------------------
 
    The  financial statements of the Fund for the fiscal year ended February 29,
1996 included in this  Statement of Additional  Information and incorporated  by
reference  in the Prospectus have been  so included and incorporated in reliance
on the report  of Price Waterhouse  LLP, independent accountants,  given on  the
authority of said firm as experts in auditing and accounting.
 
REGISTRATION STATEMENT
- --------------------------------------------------------------------------------
 
    This  Statement of Additional Information and  the Prospectus do not contain
all of the  information set  forth in the  Registration Statement  the Fund  has
filed  with the  Securities and  Exchange Commission.  The complete Registration
Statement may  be obtained  from  the Securities  and Exchange  Commission  upon
payment of the fee prescribed by the rules and regulations of the Commission.
 
                                       38
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
REPORT OF INDEPENDENT ACCOUNTANTS
 
TO THE SHAREHOLDERS AND BOARD OF DIRECTORS
OF DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
 
In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights present fairly, in all
material respects, the financial position of Dean Witter Natural Resource
Development Securities Inc. (the "Fund") at February 29, 1996, the results of
its operations for the year then ended, the changes in its net assets for each
of the two years in the period then ended and the financial highlights for each
of the ten years in the period then ended, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Fund's management; our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audits, which included
confirmation of securities owned at February 29, 1996 by correspondence with the
custodian and brokers, and the application of alternative auditing procedures
where confirmations from brokers were not received, provide a reasonable basis
for the opinion expressed above.
 
PRICE WATERHOUSE LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
APRIL 12, 1996
 
- --------------------------------------------------------------------------------
                      1996 FEDERAL TAX NOTICE (UNAUDITED)
 
       During  the year  ended February  29, 1996,  the Fund  paid to its
       shareholders $0.46  per share  from long-term  capital gains.  For
       such period, 86.38% of the income paid qualified for the dividends
       received deduction available to corporations.
 
                                       39
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
PORTFOLIO OF INVESTMENTS FEBRUARY 29, 1996
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             COMMON STOCKS (92.5%)
             BASIC ENERGY (39.2%)
             NATURAL GAS - DIVERSIFIED (2.8%)
    30,000   Enron Corp..........................  $     1,098,750
    30,000   Sonat, Inc..........................        1,005,000
    25,000   Tenneco Inc.........................        1,396,875
    17,000   Williams Companies, Inc.............          807,500
                                                   ---------------
                                                         4,308,125
                                                   ---------------
             NATURAL GAS - EXPLORATION & PRODUCTION (5.1%)
    30,000   Anardarko Petroleum Corp............        1,635,000
    55,000   Apache Corp.........................        1,430,000
    50,000   Enron Oil & Gas Co..................        1,250,000
    65,000   Enserch Exploration, Inc.*..........          617,500
    20,000   Newfield Exploration Co.*...........          585,000
    25,000   Triton Energy Corp. (Canada)*.......        1,240,625
    40,000   Union Pacific Resources Group
             Inc.................................        1,030,000
                                                   ---------------
                                                         7,788,125
                                                   ---------------
             OIL INTEGRATED - DOMESTIC (7.7%)
    30,000   Amerada Hess Corp...................        1,545,000
    48,000   Amoco Corp..........................        3,336,000
    30,000   Kerr-McGee Corp.....................        1,788,750
    35,000   Phillips Petroleum Co...............        1,225,000
    40,000   Unocal Corp.........................        1,200,000
    75,000   USX-Marathon Group..................        1,387,500
    60,000   Vintage Petroleum, Inc..............        1,230,000
                                                   ---------------
                                                        11,712,250
                                                   ---------------
             OIL INTEGRATED - INTERNATIONAL (19.4%)
    25,000   British Petroleum Co. PLC (ADR)
             (United Kingdom)....................        2,509,375
    45,000   Chevron Corp........................        2,503,125
    35,000   Ente Nazionale Idrocarburi SpA (ADR)
             Italy*..............................        1,316,875
    85,000   Exxon Corp..........................        6,757,500
    40,000   Imperial Oil Ltd. (F Shares)
             (Canada)............................        1,460,000
    50,000   Mobil Corp..........................        5,481,250
    25,000   Royal Dutch Petroleum Co. (ADR)
             (Netherlands).......................        3,443,750
    50,000   Texaco, Inc.........................        3,987,500
    30,000   Total S.A. (ADR) (France)...........          986,250
    60,000   Yacimentos Petroliferos Fiscales
             S.A. (ADR) (Argentina)..............        1,162,500
                                                   ---------------
                                                        29,608,125
                                                   ---------------
             OIL INTERNATIONAL - EXPLORATION & PRODUCTION (1.2%)
    90,000   Union Texas Petroleum Holdings,
             Inc.................................        1,777,500
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             OIL PRODUCTION - DOMESTIC (2.8%)
    35,000   Louisiana Land &
             Exploration Co......................  $     1,461,250
    40,000   Murphy Oil Corp.....................        1,670,000
    30,000   Oryx Energy Co.*....................          386,250
    35,000   Parker & Parsley
             Petroleum Co........................          752,500
                                                   ---------------
                                                         4,270,000
                                                   ---------------
             OIL REFINERIES (0.2%)
    10,000   Repsol S.A. (ADR) (Spain)...........          362,500
                                                   ---------------
 
             TOTAL BASIC ENERGY..................       59,826,625
                                                   ---------------
 
             ENERGY DEVELOPMENT & TECHNOLOGY (11.8%)
             OIL DRILLING (2.7%)
    20,000   Diamond Offshore
             Drilling, Inc.*.....................          732,500
    35,000   Ensco International Inc.*...........          844,375
    25,000   Helmerich & Payne, Inc..............          837,500
    75,000   Rowan Companies, Inc.*..............          815,625
    20,000   Sonat Offshore Drilling, Inc........          870,000
                                                   ---------------
                                                         4,100,000
                                                   ---------------
             OIL EQUIPMENT & SERVICES (9.1%)
    35,000   BJ Services Co.*....................          966,875
    30,000   Baker Hughes Inc....................          791,250
    25,000   Camco International, Inc............          709,375
    25,000   Coflexip S.A. (ADR) (France)........          437,500
    60,000   Core Laboratories NV
             (Netherlands)*......................          600,000
    30,000   Dresser Industries, Inc.............          843,750
    35,000   Falcon Drilling Company, Inc.*......          704,375
    25,000   Input/Output, Inc.*.................          743,750
    35,000   McDermott International, Inc........          673,750
    35,000   Schlumberger Ltd. (Netherlands
             Antilles)...........................        2,550,625
    25,000   SEACOR Holdings, Inc.*..............          831,250
    25,000   Seitel, Inc.*.......................          646,875
    60,000   Smith International, Inc.*..........        1,222,500
    30,000   Weatherford Enterra, Inc............          918,750
    23,000   Western Atlas Inc.*.................        1,210,375
                                                   ---------------
                                                        13,851,000
                                                   ---------------
 
             TOTAL ENERGY DEVELOPMENT &
             TECHNOLOGY..........................       17,951,000
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       40
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
PORTFOLIO OF INVESTMENTS FEBRUARY 29, 1996, CONTINUED
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             METALS & BASIC MATERIALS (41.5%)
             ALUMINUM (2.8%)
    25,000   Alumax Inc.*........................  $       903,125
    40,000   Aluminum Co. of America.............        2,270,000
    20,000   Reynolds Metals Co..................        1,032,500
                                                   ---------------
                                                         4,205,625
                                                   ---------------
             BUILDING MATERIALS (0.8%)
    40,000   Masco Corp..........................        1,140,000
                                                   ---------------
             CHEMICALS - DIVERSIFIED (11.2%)
    25,000   Air Products &
             Chemicals, Inc......................        1,331,250
    35,000   Dow Chemical Co.....................        2,808,750
    65,000   Du Pont (E.I.) de Nemours & Co.,
             Inc.................................        4,972,500
    25,000   Engelhard Corp......................          509,375
    30,000   First Mississippi Corp..............          783,750
    50,000   Georgia Gulf Corp...................        1,593,750
    18,000   Grace (W.R.) & Co...................        1,242,000
    22,000   Monsanto Co.........................        2,961,750
    25,000   Praxair, Inc........................          862,500
                                                   ---------------
                                                        17,065,625
                                                   ---------------
             CHEMICALS - SPECIALTY (4.5%)
    65,000   Agrium Inc. (Canada)................        1,002,061
    60,000   Calgon Carbon Corp..................          675,000
    40,000   Corning, Inc........................        1,300,000
    15,000   Cytec Industries Inc.*..............        1,155,000
    50,000   Ethyl Corp..........................          537,500
    25,000   IMC Global, Inc.....................        1,031,250
    30,000   Morton International, Inc...........        1,136,250
                                                   ---------------
                                                         6,837,061
                                                   ---------------
             COAL (0.6%)
    60,000   Hanson PLC (ADR)
             (United Kingdom)....................          885,000
                                                   ---------------
             COPPER (1.5%)
    40,687   Freeport-McMoran Copper & Gold, Inc.
             (Series A)..........................        1,301,984
    15,000   Phelps Dodge Corp...................          916,875
                                                   ---------------
                                                         2,218,859
                                                   ---------------
             GOLD MINING (5.9%)
    60,000   Barrick Gold Corp. (Canada).........        1,815,000
    45,954   Newmont Mining Corp.................        2,613,634
    25,000   Pegasus Gold, Inc.*.................          393,750
    60,000   Placer Dome Inc. (Canada)...........        1,695,000
   105,000   Santa Fe Pacific Gold Corp..........        1,640,625
    90,000   TVX Gold, Inc. (Canada)*............          888,750
                                                   ---------------
                                                         9,046,759
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             MACHINERY - CONSTRUCTION & MATERIALS (3.1%)
    15,000   Caterpillar, Inc....................  $     1,003,125
    30,000   Deere & Co..........................        1,173,750
    25,000   Fluor Corp..........................        1,678,125
    40,000   Global Industrial
             Technologies, Inc.*.................          935,000
                                                   ---------------
                                                         4,790,000
                                                   ---------------
             METALS & MINING (1.2%)
    25,000   Inco Ltd. (Canada)..................          796,875
    50,000   Stillwater Mining Co.*..............        1,075,000
                                                   ---------------
                                                         1,871,875
                                                   ---------------
             PAPER & FOREST PRODUCTS (3.8%)
    40,000   International Paper Co..............        1,425,000
    50,000   Jefferson Smurfit Corp.*............          568,750
    40,000   Longview Fibre Co...................          650,000
    50,000   Louisiana-Pacific Corp..............        1,156,250
    25,000   Temple-Inland Inc...................        1,006,250
    25,000   Weyerhaeuser Co.....................        1,059,375
                                                   ---------------
                                                         5,865,625
                                                   ---------------
             RAILROADS (3.6%)
    20,000   Burlington Northern Sante Fe
             Corp................................        1,600,000
    10,000   Conrail, Inc........................          721,250
    25,000   CSX Corp............................        1,121,875
    30,000   Union Pacific Corp..................        1,980,000
                                                   ---------------
                                                         5,423,125
                                                   ---------------
             STEEL (0.7%)
    10,000   Nucor Corp..........................          538,750
    45,000   Oregon Steel Mills, Inc.............          590,625
                                                   ---------------
                                                         1,129,375
                                                   ---------------
             WASTE DISPOSAL (1.8%)
    80,000   Allwaste, Inc.*.....................          350,000
    25,000   Browning-Ferris
             Industries, Inc.....................          740,625
    60,000   WMX Technologies, Inc...............        1,710,000
                                                   ---------------
                                                         2,800,625
                                                   ---------------
 
             TOTAL METALS & BASIC MATERIALS......       63,279,554
                                                   ---------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $114,540,877)......      141,057,179
                                                   ---------------
 
             CONVERTIBLE PREFERRED STOCK (0.6%)
             STEEL
    20,000   USX Corp. $6.50
             (Identified Cost $1,004,910)........          975,000
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       41
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
PORTFOLIO OF INVESTMENTS FEBRUARY 29, 1996, CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             SHORT-TERM INVESTMENT (2.2%)
             REPURCHASE AGREEMENT
  $  3,418   The Bank of New York 5.75% due
             03/01/96 (dated 02/29/96; proceeds
             $3,418,142; collateralized by
             $647,042 Federal Home Loan Mortgage
             Corp. 9.50% due 06/01/25 valued at
             $678,300, and $2,951,567 Federal
             National Mortgage Assoc. 6.36% due
             11/01/22 valued at $2,807,648)
             (Identified Cost $3,417,596)........  $     3,417,596
                                                   ---------------
 
TOTAL INVESTMENTS
(IDENTIFIED COST $118,963,383)
(A)...........................       95.3%   145,449,775
 
OTHER ASSETS IN EXCESS OF
LIABILITIES...................        4.7      7,211,667
                                    -----   ------------
 
NET ASSETS....................      100.0%  $152,661,442
                                    -----   ------------
                                    -----   ------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
 *   Non-income producing security.
(a)  The aggregate cost for federal income tax purposes approximates identified
     cost.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       42
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
FINANCIAL STATEMENTS
 
STATEMENT OF ASSETS AND LIABILITIES
FEBRUARY 29, 1996
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $118,963,383)............................  $145,449,775
Receivable for:
    Capital stock sold......................................     6,752,653
    Investments sold........................................     2,471,708
    Dividends...............................................       433,387
    Foreign withholding taxes reclaimed.....................        22,945
Prepaid expenses............................................        29,138
                                                              ------------
 
     TOTAL ASSETS...........................................   155,159,606
                                                              ------------
 
LIABILITIES:
Payable for:
    Investments purchased...................................     2,095,261
    Plan of distribution fee................................       116,437
    Capital stock repurchased...............................        96,912
    Investment management fee...............................        74,960
Accrued expenses............................................       114,594
                                                              ------------
 
     TOTAL LIABILITIES......................................     2,498,164
                                                              ------------
 
NET ASSETS:
Paid-in-capital.............................................   122,965,473
Net unrealized appreciation.................................    26,486,392
Accumulated undistributed net investment income.............       235,202
Accumulated undistributed net realized gain.................     2,974,375
                                                              ------------
 
     NET ASSETS.............................................  $152,661,442
                                                              ------------
                                                              ------------
 
NET ASSET VALUE PER SHARE,
  12,017,301 SHARES OUTSTANDING (500,000,000 SHARES
  AUTHORIZED OF $.01 PAR VALUE).............................
                                                                    $12.70
                                                              ------------
                                                              ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       43
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED FEBRUARY 29, 1996
 
<TABLE>
<S>                                                           <C>
NET INVESTMENT INCOME:
 
INCOME
Dividends (net of $60,390 foreign withholding tax)..........  $ 3,172,448
Interest....................................................      254,278
                                                              -----------
 
     TOTAL INCOME...........................................    3,426,726
                                                              -----------
 
EXPENSES
Plan of distribution fee....................................    1,369,150
Investment management fee...................................      883,804
Transfer agent fees and expenses............................      222,760
Shareholder reports and notices.............................       67,979
Professional fees...........................................       43,463
Registration fees...........................................       38,845
Custodian fees..............................................       28,491
Directors' fees and expenses................................       22,030
Other.......................................................        6,530
                                                              -----------
 
     TOTAL EXPENSES.........................................    2,683,052
                                                              -----------
 
     NET INVESTMENT INCOME..................................      743,674
                                                              -----------
 
NET REALIZED AND UNREALIZED GAIN:
Net realized gain...........................................    9,657,602
Net change in unrealized appreciation.......................   20,867,725
                                                              -----------
 
     NET GAIN...............................................   30,525,327
                                                              -----------
 
NET INCREASE................................................  $31,269,001
                                                              -----------
                                                              -----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       44
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                FOR THE YEAR        FOR THE YEAR
                                                                    ENDED               ENDED
                                                              FEBRUARY 29, 1996   FEBRUARY 28, 1995
- ---------------------------------------------------------------------------------------------------
<S>                                                           <C>                 <C>
 
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income.......................................    $    743,674        $  1,091,182
Net realized gain...........................................       9,657,602           4,977,602
Net change in unrealized appreciation.......................      20,867,725          (7,920,860)
                                                              -----------------   -----------------
 
     NET INCREASE (DECREASE)................................      31,269,001          (1,852,076)
                                                              -----------------   -----------------
 
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income.......................................        (476,340)         (1,433,023)
Net realized gain...........................................      (7,165,637)         (9,652,919)
                                                              -----------------   -----------------
 
     TOTAL..................................................      (7,641,977)        (11,085,942)
                                                              -----------------   -----------------
Net increase (decrease) from capital stock transactions.....      (3,777,196)          6,290,710
                                                              -----------------   -----------------
 
     TOTAL INCREASE (DECREASE)..............................      19,849,828          (6,647,308)
 
NET ASSETS:
Beginning of period.........................................     132,811,614         139,458,922
                                                              -----------------   -----------------
 
     END OF PERIOD
    (INCLUDING UNDISTRIBUTED NET INVESTMENT INCOME OF
    $235,202 AND DISTRIBUTIONS IN EXCESS OF NET INVESTMENT
    INCOME OF $32,132, RESPECTIVELY)........................    $152,661,442        $132,811,614
                                                              -----------------   -----------------
                                                              -----------------   -----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
                                       45
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
NOTES TO FINANCIAL STATEMENTS FEBRUARY 29, 1996
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter Natural Resource Development Securities Inc. (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 capital growth. The Fund invests primarily in common stock of
companies in the natural resources and related areas. The Fund was incorporated
in Maryland on December 22, 1980.
 
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 or American 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; (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 Directors (valuation of debt securities for
which market quotations are not readily available may be based upon current
market prices of securities which are comparable in coupon, rating and maturity
or an appropriate matrix utilizing similar factors); 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 life of the respective securities. Interest
income is accrued daily.
 
                                       46
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
NOTES TO FINANCIAL STATEMENTS FEBRUARY 29, 1996, CONTINUED
 
C. 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.
 
D. 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.
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an Investment Management Agreement with Dean Witter InterCapital
Inc. (the "Investment Manager"), the Fund pays a management fee, accrued daily
and payable monthly, by applying the following annual rates to the net assets of
the Fund determined at the close of each business day: 0.625% to the portion of
daily net assets not exceeding $250 million and 0.50% to the portion of daily
net assets exceeding $250 million.
 
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.
 
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 pursuant
to which the Fund pays the Distributor compensation, accrued
 
                                       47
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
NOTES TO FINANCIAL STATEMENTS FEBRUARY 29, 1996, CONTINUED
 
daily and payable monthly, at an annual rate of 1.0% of the lesser of: (a) the
average daily aggregate gross sales of the Fund's shares since the
implementation of the Plan on July 2, 1984 (not including reinvestment of
dividend or capital gain distributions) less the average daily aggregate net
asset value of the Fund's shares redeemed since the implementation of the Plan
upon which a contingent deferred sales charge has been imposed or upon which
such charge has been waived; or (b) the Fund's average daily net assets
attributable to shares issued, net of related shares redeemed, since the
implementation of the Plan. Amounts paid under the Plan are paid to the
Distributor to compensate it for the services provided and the expenses borne by
it and others in the distribution of the Fund's shares, including the payment of
commissions for sales of the Fund's shares 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 other employees or
selected broker-dealers who engage in or support distribution of the Fund's
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 be compensated under the
Plan for its opportunity costs in advancing such amounts, which compensation
would be in the form of a carrying charge on any unreimbursed expenses incurred
by the Distributor.
 
Provided that the Plan continues in effect, any cumulative expenses incurred but
not yet recovered may be recovered through future distribution fees from the
Fund and contingent deferred sales charges from the Fund's shareholders.
 
The Distributor has informed the Fund that for the year ended February 29, 1996,
it received approximately $185,000 in contingent deferred sales charges from
certain redemptions of the Fund's shares.
 
4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The cost of purchases and proceeds from sales of portfolio securities, excluding
short-term investments, for the year ended February 29, 1996 aggregated
$66,474,179 and $87,368,509, respectively.
 
For the year ended February 29, 1996, the Fund incurred brokerage commissions of
$88,566 with DWR for portfolio transactions executed on behalf of the Fund.
 
                                       48
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
NOTES TO FINANCIAL STATEMENTS FEBRUARY 29, 1996, CONTINUED
 
Dean Witter Trust Company, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At February 29, 1996, the Fund had
transfer agent fees and expenses payable of approximately $18,000.
 
The Fund has an unfunded noncontributory defined benefit pension plan covering
all independent Directors of the Fund who will have served as independent
Directors/Trustees for at least five years at the time of retirement. Benefits
under this plan are based on years of service and compensation during the last
five years of service. Aggregate pension costs for the year ended February 29,
1996 included in Directors' fees and expenses in the Statement of Operations
amounted to $5,556. At February 29, 1996, the Fund had an accrued pension
liability of $51,995 which is included in accrued expenses in the Statement of
Assets and Liabilities.
 
5. CAPITAL STOCK
 
Transactions in capital stock were as follows:
 
<TABLE>
<CAPTION>
                                                                        FOR THE YEAR ENDED            FOR THE YEAR ENDED
                                                                        FEBRUARY 29, 1996             FEBRUARY 28, 1995
                                                                   ----------------------------   --------------------------
                                                                     SHARES          AMOUNT         SHARES         AMOUNT
                                                                   -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Sold.............................................................   17,740,630   $  213,549,836     8,003,288   $ 91,308,700
Reinvestment of dividends and distributions......................      587,535        7,130,881       943,312     10,339,857
                                                                   -----------   --------------   -----------   ------------
                                                                    18,328,165      220,680,717     8,946,600    101,648,557
Repurchased......................................................  (18,637,754)    (224,457,913)   (8,419,961)   (95,357,847)
                                                                   -----------   --------------   -----------   ------------
Net increase (decrease)..........................................     (309,589)  $   (3,777,196)      526,639   $  6,290,710
                                                                   -----------   --------------   -----------   ------------
                                                                   -----------   --------------   -----------   ------------
</TABLE>
 
                                       49
<PAGE>
DEAN WITTER NATURAL RESOURCE DEVELOPMENT SECURITIES INC.
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of capital stock outstanding
throughout each period:
 
<TABLE>
<CAPTION>
                                               FOR THE YEAR ENDED FEBRUARY 28
                  ----------------------------------------------------------------------------------------
                   1996*    1995     1994     1993     1992*    1991     1990     1989     1988*    1987
- ----------------------------------------------------------------------------------------------------------
 
<S>               <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>
PER SHARE OPERATING
PERFORMANCE:
 
Net asset value,
 beginning of
 period.......... $ 10.77  $ 11.82  $ 11.36  $ 10.20  $ 11.03  $ 11.33  $  9.93  $  9.46  $  9.10  $  7.43
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
Net investment
 income..........    0.06     0.09     0.09     0.16     0.20     0.25     0.30     0.23     0.20     0.14
Net realized and
 unrealized gain
 (loss)..........    2.53    (0.24)    1.25     1.18    (0.44)    0.02     1.80     0.72     0.44     1.75
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
Total from
 investment
 operations......    2.59    (0.15)    1.34     1.34    (0.24)    0.27     2.10     0.95     0.64     1.89
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
Less dividends
 and
 distributions
 from:
   Net investment
   income........   (0.04)   (0.12)   (0.09)   (0.18)   (0.20)   (0.28)   (0.32)   (0.21)   (0.28)   (0.22)
   Net realized
   gain..........   (0.62)   (0.78)   (0.79)   --       (0.39)   (0.29)   (0.38)   (0.27)   --       --
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
Total dividends
 and
 distributions...   (0.66)   (0.90)   (0.88)   (0.18)   (0.59)   (0.57)   (0.70)   (0.48)   (0.28)   (0.22)
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
Net asset value,
 end of period... $ 12.70  $ 10.77  $ 11.82  $ 11.36  $ 10.20  $ 11.03  $ 11.33  $  9.93  $  9.46  $  9.10
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
                  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------
 
TOTAL INVESTMENT
RETURN+..........   24.32%   (1.26)%   12.16%   13.31%   (1.91)%    2.87%   21.11%   10.29%    7.32%   26.21%
 
RATIOS TO AVERAGE
NET ASSETS:
Expenses.........    1.90%    1.90%    1.91%    1.96%    1.93%    1.80%    1.81%    1.92%    1.81%    1.74%
 
Net investment
 income..........    0.52%    0.77%    0.73%    1.46%    1.67%    2.28%    2.57%    2.09%    2.14%    2.61%
 
SUPPLEMENTAL DATA:
Net assets, end
 of period, in
 thousands....... $152,661 $132,812 $139,459 $118,496 $113,145 $150,636 $154,741 $136,911 $171,725 $82,985
 
Portfolio
 turnover rate...      49%      59%      69%      52%      31%      29%      22%       7%      26%      14%
<FN>
 
- ---------------------
 *   Year ended February 29.
 +   Does not reflect the deduction of sales charge.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                       50


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