INVESTMENT TRUST
497, 2000-07-24
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                           SCUDDER S&P 500 INDEX FUND

                         SUPPLEMENT TO THE STATEMENT OF
                   ADDITIONAL INFORMATION DATED APRIL 12, 2000

                           --------------------------

On or about  September  11,  2000,  Scudder  S&P 500 Index  Fund will  offer two
classes of shares to provide investors with different purchase options.  The two
classes are Class S and Class AARP.  Each class has its own  important  features
and policies.  In addition,  as of the date noted above,  all existing shares of
the fund will be  redesignated  as Class S shares  of the fund.  Shares of Class
AARP will be especially designed for members of AARP.

The  following   disclosure  replaces  the  disclosure   regarding   "Additional
Information About Opening an Account" on page 11:

Additional Information About Opening an Account

         Clients having a regular investment counsel account with the Adviser or
its affiliates and members of their immediate  families,  officers and employees
of the Adviser or of any affiliated  organization and members of their immediate
families,  members of the  National  Association  of  Securities  Dealers,  Inc.
("NASD") and banks may, if they prefer,  subscribe initially for at least $2,500
for Class S and $1,000 for Class AARP through Scudder Investor Services, Inc. by
letter, fax, or telephone.

         Shareholders  of other  Scudder  funds who have  submitted  an  account
application  and have certified a tax  identification  number,  clients having a
regular  investment  counsel  account  with the  Adviser or its  affiliates  and
members of their immediate families, officers and employees of the Adviser or of
any affiliated  organization and their immediate families,  members of the NASD,
and banks may open an account by wire.  Investors  interesting  in  investing in
Class S must call  1-800-225-5163 to get an account number.  During the call the
investor will be asked to indicate the Fund name, class name, amount to be wired
($2,500  minimum for Class S and $1,000 for Class  AARP),  name of bank or trust
company  from  which the wire will be sent,  the exact  registration  of the new
account,  the tax identification  number or Social Security number,  address and
telephone  number.  The  investor  must  then  call the bank to  arrange  a wire
transfer to The Scudder  Funds,  Boston,  MA 02101,  ABA Number  011000028,  DDA
Account  9903-5552.  The investor  must give the Scudder fund name,  class name,
account  name and the new account  number.  Finally,  the  investor  must send a
completed and signed application to the Fund promptly.  Investors  interested in
investing in Class AARP should call 1-800-253-2277 for further instructions.

         The  minimum  initial  purchase  amount is less than $2,500 for Class S
under certain plan accounts and is $1,000 for Class AARP.

The following disclosure replaces the disclosure regarding "Minimum balances" on
page 12:

Minimum balances

         Shareholders  should maintain a share balance worth at least $2,500 for
Class S and $1,000 for Class AARP.  For  fiduciary  accounts  such as IRAs,  and
custodial  accounts such as Uniform Gift to Minor Act and Uniform Trust to Minor
Act accounts,  the minimum balance is $1000 for Class S and $500 for Class AARP.
These amounts may be changed by the Fund's Board of Trustees.  A shareholder may
open an account with at least $1,000 ($500 for fiduciary/custodial accounts), if
an automatic  investment plan (AIP) of $100/month  ($50/month for Class AARP and
fiduciary/custodial accounts) is established. Scudder group retirement plans and
certain other accounts have similar or lower minimum share balance requirements.

         The Fund  reserves  the right,  following  60 days'  written  notice to
applicable shareholders, to:

<PAGE>

         o        for Class S,  assess an annual $10 per Fund  charge  (with the
                  Fee    to    be     paid    to    the     Fund)     for    any
                  non-fiduciary/non-custodial   account   without  an  automatic
                  investment  plan  (AIP) in place  and a  balance  of less than
                  $2,500; and

         o        redeem  all  shares  in Fund  accounts  below  $1,000  where a
                  reduction in value has occurred due to a redemption,  exchange
                  or  transfer  out of the  account.  The  Fund  will  mail  the
                  proceeds of the redeemed account to the shareholder.

         Reductions  in value that result  solely from market  activity will not
trigger  an  involuntary  redemption.  Shareholders  with a  combined  household
account  balance in any of the Scudder  Funds of  $100,000  or more,  as well as
group  retirement  and certain  other  accounts  will not be subject to a fee or
automatic redemption.

         Fiduciary (e.g., IRA or Roth IRA) and custodial accounts (e.g., UGMA or
UTMA) with balances below $100 are subject to automatic  redemption following 60
days' written notice to applicable shareholders.


The  following   disclosure  replaces  the  disclosure   regarding   "Additional
Information About Making Subsequent Investments by QuickBuy" on page 13:

Additional Information About Making Subsequent Investments by QuickBuy

         Shareholders whose  predesignated bank account of record is a member of
the Automated  Clearing  House Network (ACH) and who have elected to participate
in the QuickBuy  program may purchase  shares of the Fund by telephone.  Through
this service  shareholders  may purchase up to $250,000.  To purchase  shares by
QuickBuy,  shareholders  should call before the close of regular  trading on the
New York Stock Exchange (the "Exchange"), normally 4 p.m. eastern time. Proceeds
in the  amount of your  purchase  will be  transferred  from your bank  checking
account two or three business days following your call. For requests received by
the close of regular  trading on the  Exchange,  shares will be purchased at the
net asset value per share  calculated at the close of trading on the day of your
call.  QuickBuy  requests  received  after the close of  regular  trading on the
Exchange  will begin their  processing  and be  purchased at the net asset value
calculated  the following  business day. If you purchase  shares by QuickBuy and
redeem them within seven days of the purchase,  the Fund may hold the redemption
proceeds for a period of up to seven business  days. If you purchase  shares and
there are insufficient  funds in your bank account the purchase will be canceled
and you will be  subject  to any  losses or fees  incurred  in the  transaction.
QuickBuy  transactions  are not available  for most  retirement  plan  accounts.
However, QuickBuy transactions are available for Scudder IRA accounts.

         In order to  request  purchases  by  QuickBuy,  shareholders  must have
completed  and returned to the Transfer  Agent the  application,  including  the
designation  of a bank account from which the purchase  payment will be debited.
New investors wishing to establish  QuickBuy may so indicate on the application.
Existing  shareholders  who wish to add  QuickBuy to their  account may do so by
completing a QuickBuy  Enrollment  Form.  After  sending in an  enrollment  form
shareholders should allow 15 days for this service to be available.

         The Fund  employs  procedures,  including  recording  telephone  calls,
testing a caller's  identity,  and sending  written  confirmation  of  telephone
transactions,   designed  to  give   reasonable   assurance  that   instructions
communicated  by telephone  are genuine and to discourage  fraud.  To the extent
that the Fund does not follow such procedures, they may be liable for losses due
to  unauthorized  or  fraudulent  telephone  instructions.  The Fund will not be
liable for acting upon instructions communicated by telephone that it reasonably
believes to be genuine.

                                       2
<PAGE>

         Investors interested in making subsequent  investments in Class AARP of
the Fund should call 1-800-253-2277 for further instruction.

The following information replaces the disclosure on page 14 of the SAI relating
to "Share Price", "Share Certificates" and "Other Information":

Share Price

         Purchases  will be filled  without  sales charge at the net asset value
per share next computed  after  receipt of the  application  in good order.  Net
asset value  normally will be computed for each class as of the close of regular
trading  on each day  during  which the  Exchange  is open for  trading.  Orders
received after the close of regular  trading on the Exchange will be executed at
the next  business  day's net  asset  value.  If the order has been  placed by a
member of the NASD, other than the Distributor, it is the responsibility of that
member  broker,  rather than the Fund, to forward the purchase  order to Scudder
Service  Corporation  (the  "Transfer  Agent") in Boston by the close of regular
trading on the Exchange.

         There is no sales charge in  connection  with the purchase of shares of
any class of the Fund.

Share Certificates

         Due  to  the  desire  of  the  Fund's  management  to  afford  ease  of
redemption,  certificates will not be issued to indicate  ownership in the Fund.
Share  certificates now in a shareholder's  possession may be sent to the Fund's
Transfer  Agent  for  cancellation  and  credit to such  shareholder's  account.
Shareholders who prefer may hold the certificates in their possession until they
wish to exchange or redeem such shares.

         All issued and outstanding shares of what were formerly AARP Funds that
were  subsequently  reorganized into existing Scudder Funds were  simultaneously
cancelled  on the  books  of the AARP  Funds.  Share  certificates  representing
interests in shares of the relevant AARP Fund will  represent a number of shares
of Class  AARP of the  relevant  Scudder  Fund  into  which  the  AARP  Fund was
reorganized.  Class  AARP  shares  of each  fund  will  not  issue  certificates
representing shares in connection with the reorganization.


Other Information

         The Fund has  authorized  certain  members  of the NASD  other than the
Distributor  to accept  purchase  and  redemption  orders for its shares.  Those
brokers may also  designate  other  parties to accept  purchase  and  redemption
orders on the Fund's behalf. Orders for purchase or redemption will be deemed to
have been received by the Fund when such brokers or their  authorized  designees
accept the orders. Subject to the terms of the contract between the Fund and the
broker,  ordinarily  orders  will be priced at a class's  net asset  value  next
computed  after  acceptance  by such  brokers  or  their  authorized  designees.
Further,  if  purchases  or  redemptions  of the Fund's  shares are arranged and
settlement is made at an investor's  election  through any other authorized NASD
member, that member may, at its discretion,  charge a fee for that service.  The
Board of Trustees and the Distributor, each has the right to limit the amount of
purchases  by, and to refuse to sell to, any person.  The Board of Trustees  and
the  Distributor  may suspend or terminate the offering of shares of the Fund at
any time for any reason.

         The "Tax  Identification  Number"  section of the  Application  must be
completed when opening an account.  Applications  and purchase  orders without a
certified  tax  identification  number and certain other  certified  information
(e.g.,  from exempt  organizations  a certification  of exempt status),  will be
returned  to the  investor.  The Fund  reserves  the right,  following  30 days'
notice,  to redeem all shares in  accounts  without a correct  certified  Social
Security or tax  identification  number.  A  shareholder  may avoid  involuntary
redemption  by providing  the Fund with a tax  identification  number during the
30-day notice period.

                                       3
<PAGE>

         The Trust may issue  shares at net asset value in  connection  with any
merger or  consolidation  with, or  acquisition of the assets of, any investment
company or personal  holding  company,  subject to the  requirements of the 1940
Act.

The following disclosure replaces the disclosure  regarding  "Exchanges" on page
15:

Exchanges

         Exchanges  are  comprised of a  redemption  from one Scudder Fund and a
purchase into another Scudder Fund. The purchase side of the exchange either may
be an additional  investment  into an existing  account or may involve opening a
new account in the other Fund. When an exchange involves a new account,  the new
account  will be  established  with the same  registration,  tax  identification
number,  address,  telephone redemption option,  "Scudder Automated  Information
Line"  (SAIL)  transaction  authorization  and  dividend  option as the existing
account.  Other features will not carry over  automatically  to the new account.
Exchanges  to a new Fund account must be for a minimum of $2,500 for Class S and
$1,000 for Class AARP. When an exchange represents an additional investment into
an existing  account,  the account  receiving  the exchange  proceeds  must have
identical registration,  address, and account options/features as the account of
origin. Exchanges into an existing account must be for $100 or more for Class S.
If the  account  receiving  the  exchange  proceeds  is to be  different  in any
respect,  the  exchange  request must be in writing and must contain an original
signature guarantee.

         Exchange  orders  received  before the close of regular  trading on the
Exchange on any business day ordinarily will be executed at respective net asset
values  determined  on that day.  Exchange  orders  received  after the close of
regular trading on the Exchange will be executed on the following business day.

         Investors  may also  request,  at no extra  charge,  to have  exchanges
automatically  executed on a predetermined  schedule from one Scudder Fund to an
existing  account in another  Scudder Fund, at current net asset value,  through
Scudder's  Systematic Exchange Program.  Exchanges must be for a minimum of $50.
Shareholders  may add this  free  feature  over  the  telephone  or in  writing.
Automatic Exchanges will continue until the shareholder requests by telephone or
in writing to have the  feature  removed,  or until the  originating  account is
depleted. The Trust and the Transfer Agent each reserves the right to suspend or
terminate the privilege of the Systematic Exchange Program at any time.

         There is no charge to the shareholder for any exchange described above.
An exchange  into another  Scudder Fund is a redemption  of shares and therefore
may  result  in tax  consequences  (gain or loss)  to the  shareholder,  and the
proceeds  of such  an  exchange  may be  subject  to  backup  withholding.  (See
"TAXES.")

         Investors currently receive the exchange privilege,  including exchange
by  telephone,  automatically  without  having  to elect  it.  The Fund  employs
procedures,  including recording  telephone calls,  testing a caller's identity,
and sending  written  confirmation of telephone  transactions,  designed to give
reasonable  assurance that  instructions  communicated by telephone are genuine,
and to  discourage  fraud.  To the  extent  that the Fund does not  follow  such
procedures,  it may be liable  for  losses  due to  unauthorized  or  fraudulent
telephone instructions. The Fund will not be liable for acting upon instructions
communicated  by telephone that it reasonably  believes to be genuine.  The Fund
and the  Transfer  Agent each  reserves  the right to suspend or  terminate  the
privilege of exchanging by telephone or fax at any time.

         The Scudder Funds into which  investors may make an exchange are listed
under  "THE  SCUDDER  FAMILY  OF  FUNDS"  herein.  Before  making  an  exchange,
shareholders should obtain from Scudder Investor Services,  Inc. a prospectus of
the Scudder  Fund into which the  exchange is being  contemplated.  The exchange
privilege may not be available  for certain  Scudder Funds or classes of Scudder
Funds.  For  more  information,   please  call   1-800-225-5163   (Class  S)  or
1-800-253-2277 (Class AARP).

                                       4
<PAGE>

         Scudder  retirement  plans may have  different  exchange  requirements.
Please refer to appropriate plan literature.


The following disclosure replaces the disclosure regarding "Redemptions" on page
16:

Redemption By Telephone

         Shareholders currently receive the right automatically,  without having
to elect it, to redeem by telephone up to $100,000 and have the proceeds  mailed
to their address of record.  Shareholders  may also request by telephone to have
the proceeds mailed or wired to their  predesignated  bank account.  In order to
request wire  redemptions  by telephone,  shareholders  must have  completed and
returned to the Transfer Agent the  application,  including the designation of a
bank account to which the redemption proceeds are to be sent.

         (a)      NEW INVESTORS  wishing to establish  the telephone  redemption
                  privilege  must  complete  the  appropriate   section  on  the
                  application.

         (b)      EXISTING  SHAREHOLDERS  (except  those  who are  Scudder  IRA,
                  Scudder pension and profit-sharing, Scudder 401(k) and Scudder
                  403(b) Planholders) who wish to establish telephone redemption
                  to a predesignated bank account or who want to change the bank
                  account previously  designated to receive redemption  proceeds
                  should  either  return  a  Telephone  Redemption  Option  Form
                  (available  upon request),  or send a letter  identifying  the
                  account and  specifying  the exact  information to be changed.
                  The letter must be signed exactly as the shareholder's name(s)
                  appears on the account.  An original signature and an original
                  signature guarantee are required for each person in whose name
                  the account is registered.

         If a request for a redemption to a  shareholder's  bank account is made
by  telephone or fax,  payment will be by Federal  Reserve bank wire to the bank
account  designated  on the  application,  unless  a  request  is made  that the
redemption  check be mailed to the designated  bank account.  There will be a $5
charge for all wire redemptions.

         Note:  Investors  designating a savings bank to receive their telephone
         redemption  proceeds  are  advised  that if the  savings  bank is not a
         participant in the Federal Reserve System,  redemption proceeds must be
         wired through a commercial bank which is a correspondent of the savings
         bank. As this may delay  receipt by the  shareholder's  account,  it is
         suggested  that  investors  wishing to use a savings  bank discuss wire
         procedures  with  their  bank and  submit  any  special  wire  transfer
         information with the telephone redemption authorization. If appropriate
         wire information is not supplied, redemption proceeds will be mailed to
         the designated bank.

         The  Fund  employs  procedure,  including  recording  telephone  calls,
testing a caller's  identity,  and sending  written  confirmation  of  telephone
transactions,   designed  to  give   reasonable   assurance  that   instructions
communicated  by telephone are genuine,  and to discourage  fraud. To the extent
that the Fund does not follow such  procedures,  it may be liable for losses due
to  unauthorized  or  fraudulent  telephone  instructions.  The Fund will not be
liable for acting upon instructions communicated by telephone that it reasonably
believes to be genuine.

         Redemption  requests by telephone  (technically a repurchase  agreement
between the Fund and the  shareholder) of shares  purchased by check will not be
accepted  until  the  purchase  check  has  cleared  which  may take up to seven
business days.

                                       5
<PAGE>

Redemption by QuickSell

         Shareholders whose  predesignated bank account of record is a member of
the Automated  Clearing  House Network (ACH) and have elected to  participate in
the QuickSell program may sell shares of the Fund by telephone. Redemptions must
be for at  least  $250.  Proceeds  in the  amount  of  your  redemption  will be
transferred  to  your  bank  checking  account  in two or  three  business  days
following  your call. For requests  received by the close of regular  trading on
the Exchange,  normally 4 p.m. eastern time,  Shares will be redeemed at the net
asset  value per share  calculated  at the close of  trading  on the day of your
call.  QuickSell  requests  received  after the close of regular  trading on the
Exchange  will begin their  processing  the following  business  day.  QuickSell
transactions  are not available for IRA accounts and most other  retirement plan
accounts.

         In order to request  redemptions by QuickSell,  shareholders  must have
completed  and returned to the Transfer  Agent the  application,  including  the
designation of a bank account.  New investors wishing to establish QuickSell may
so indicate on the application.  Existing shareholders who wish to add QuickSell
to their  account may do so by  completing a QuickSell  Enrollment  Form.  After
sending in an enrollment  form,  shareholders  should allow for 15 days for this
service to be available.

         The  Fund  employ  procedures,  including  recording  telephone  calls,
testing a caller's  identity,  and sending  written  confirmation  of  telephone
transactions,   designed  to  give   reasonable   assurance  that   instructions
communicated  by telephone are genuine,  and to discourage  fraud. To the extent
that the Fund does not follow such  procedures,  it may be liable for losses due
to  unauthorized  or  fraudulent  telephone  instructions.  The Fund will not be
liable for acting upon instructions communicated by telephone that it reasonably
believes to be genuine.

Redemption by Mail or Fax

         Any existing share certificates representing shares being redeemed must
accompany a request for  redemption  and be duly  endorsed or  accompanied  by a
proper stock assignment form with signature(s) guaranteed.

         In order to ensure proper  authorization  before redeeming shares,  the
Transfer Agent may request additional  documents such as, but not restricted to,
stock  powers,  trust  instruments,   certificates  of  death,  appointments  as
executor,  certificates  of corporate  authority and waivers of tax (required in
some states when settling estates).

         It is suggested that  shareholders  holding shares  registered in other
than  individual  names contact the Transfer  Agent prior to any  redemptions to
ensure that all necessary documents accompany the request.  When shares are held
in the name of a corporation,  trust,  fiduciary agent, attorney or partnership,
the Transfer Agent requires, in addition to the stock power,  certified evidence
of authority to sign.  These  procedures are for the protection of  shareholders
and should be followed to ensure prompt payment. Redemption requests must not be
conditional as to date or price of the redemption. Proceeds of a redemption will
be sent within seven (7) business days after receipt by the Transfer  Agent of a
request for redemption that complies with the above requirements. Delays of more
than seven (7) days of payment for shares  tendered for repurchase or redemption
may result, but only until the purchase check has cleared.

         The  requirements  for IRA  redemptions  are  different  from those for
regular accounts. For more information call 1-800-225-5163.

The following  disclosure replaces the disclosure regarding "Internet access" on
page 18 and applies to each class of the Fund except as noted:

Internet access

                                       6
<PAGE>

World Wide Web Site -- The address of the Scudder Funds site is www.scudder.com.
The  address  for Class AARP of shares is  aarp.scudder.com.  These  sites offer
guidance on global  investing and  developing  strategies to help meet financial
goals and  provides  access to the Scudder  investor  relations  department  via
e-mail.  The sites also  enable  users to access or view Fund  prospectuses  and
profiles with links between summary information in Fund Summaries and details in
the  Prospectus.  Users  can fill out new  account  forms  on-line,  order  free
software, and request literature on Funds.

Account  Access -- The Adviser is among the first mutual fund  families to allow
shareholders to manage their fund accounts  through the World Wide Web.  Scudder
Fund  shareholders  can view a snapshot  of  current  holdings,  review  account
activity and move assets between Scudder Fund accounts.

         The Adviser's personal portfolio capabilities -- known as SEAS (Scudder
Electronic  Account  Services) -- are  accessible  only by current  Scudder Fund
shareholders  who have set up a Personal  Page on Scudder's  Web sites.  Using a
secure Web  browser,  shareholders  sign on to their  account  with their Social
Security  number and their SAIL  password.  As an additional  security  measure,
users can change their  current  password or disable  access to their  portfolio
through the World Wide Web.

         An Account Activity option reveals a financial  history of transactions
for an account,  with trade dates,  type and amount of transaction,  share price
and number of shares traded.  For users who wish to trade shares between Scudder
Funds,  the Fund Exchange option  provides a step-by-step  procedure to exchange
shares among existing fund accounts or to new Scudder Fund accounts.

The  following   information  replaces  the  disclosure  on  page  18  regarding
"Dividends and Capital Gains Distribution Options":

Dividends and Capital Gains Distribution Options

         Investors have freedom to choose whether to receive cash or to reinvest
any dividends from net investment income or distributions  from realized capital
gains in additional  shares of the Fund. A change of instructions for the method
of  payment  may be given to the  Transfer  Agent in  writing at least five days
prior to a dividend record date.  Shareholders  may change their dividend option
by calling  1-800-225-5163  for Class S and  1-800-253-2277 for Class AARP or by
sending written  instructions to the Transfer Agent. Please include your account
number with your written request.

         Reinvestment  is usually  made at the  closing  net asset  value of the
class  determined on the business day  following the record date.  Investors may
leave standing instructions with the Transfer Agent designating their option for
either  reinvestment  or cash  distribution  of any income  dividends or capital
gains distributions. If no election is made, dividends and distributions will be
invested in additional class shares of the Fund.

         Investors  may also  have  dividends  and  distributions  automatically
deposited  to  their   predesignated   bank  account  through  Scudder's  Direct
Distributions  Program.  Shareholders  who elect to  participate  in the  Direct
Distributions  Program,  and whose  predesignated  checking account of record is
with a member bank of Automated Clearing House Network (ACH) can have income and
capital  gain  distributions  automatically  deposited  to their  personal  bank
account usually within three business days after the Fund pays its distribution.
A Direct  Distributions  request form can be obtained by calling  1-800-225-5163
for Class S and 1-800-253-2277 for Class AARP.  Confirmation  Statements will be
mailed to shareholders as notification that distributions have been deposited.

         Investors  choosing to  participate in Scudder's  Automatic  Withdrawal
Plan must  reinvest any dividends or capital  gains.  For most  retirement  plan
accounts, the reinvestment of dividends and capital gains is also required.

                                       7
<PAGE>

The  following   information  replaces  the  information   regarding  "Automatic
Withdrawal Plan" on page 23:

         Non-retirement plan shareholders may establish an Automatic  Withdrawal
Plan to receive  monthly,  quarterly  or  periodic  redemptions  from his or her
account for any  designated  amount of $50 or more.  Shareholders  may designate
which day they want the automatic withdrawal to be processed.  The check amounts
may be based on the  redemption  of a fixed dollar  amount,  fixed share amount,
percent of account  value or  declining  balance.  The Plan  provides for income
dividends  and  capital  gains  distributions,  if  any,  to  be  reinvested  in
additional  Shares.  Shares are then  liquidated  as  necessary  to provide  for
withdrawal  payments.  Since the  withdrawals  are in  amounts  selected  by the
investor and have no relationship to yield or income,  payments  received cannot
be  considered  as  yield  or  income  on  the   investment  and  the  resulting
liquidations may deplete or possibly  extinguish the initial  investment and any
reinvested dividends and capital gains distributions.  Requests for increases in
withdrawal  amounts or to change the payee must be submitted in writing,  signed
exactly as the account is registered,  and contain signature  guarantee(s).  Any
such  requests must be received by the Fund's  transfer  agent ten days prior to
the date of the first automatic withdrawal.  An Automatic Withdrawal Plan may be
terminated  at any time by the  shareholder,  the Trust or its agent on  written
notice,  and will be terminated  when all Shares of the Fund under the Plan have
been  liquidated  or upon  receipt  by the  Trust  of  notice  of  death  of the
shareholder.

         An  Automatic  Withdrawal  Plan request form can be obtained by calling
1-800-225-5163 for Class S and 1-800-253-2277 for Class AARP.

The  following   information  replaces  the  information   regarding  "Automatic
Investment Plan" on page 24:

         Shareholders may arrange to make periodic investments in Class S shares
through   automatic   deductions  from  checking   accounts  by  completing  the
appropriate  form and providing the necessary  documentation  to establish  this
service. The minimum investment is $50 for Class S shares.

         Shareholders may arrange to make periodic  investments in Class AARP of
the Fund  through  automatic  deductions  from  checking  accounts.  The minimum
pre-authorized  investment  amount is $50. New  shareholders  who open a Gift to
Minors Account pursuant to the Uniform Gift to Minors Act (UGMA) and the Uniform
Transfer to Minors Act (UTMA) and who sign up for the Automatic  Investment Plan
will be able to open  the  Fund  account  for less  than  $500 if they  agree to
increase their  investment to $500 within a 10 month period.  Investors may also
invest  in any  Class  AARP for $500 if they  establish  a plan  with a  minimum
automatic  investment of at least $100 per month. This feature is only available
to Gifts to Minors  Account  investors.  The  Automatic  Investment  Plan may be
discontinued at any time without prior notice to a shareholder if any debit from
their bank is not paid, or by written notice to the  shareholder at least thirty
days prior to the next scheduled payment to the Automatic Investment Plan.

         The Automatic  Investment  Plan involves an investment  strategy called
dollar cost averaging.  Dollar cost averaging is a method of investing whereby a
specific dollar amount is invested at regular  intervals.  By investing the same
dollar amount each period, when shares are priced low the investor will purchase
more  shares  than when the share  price is  higher.  Over a period of time this
investment  approach may allow the  investor to reduce the average  price of the
shares purchased.  However, this investment approach does not assure a profit or
protect  against loss. This type of regular  investment  program may be suitable
for various  investment  goals such as, but not limited to, college  planning or
saving for a home.


The following information supplements the first paragraph of "Fund Organization"
on page 27:

         The Fund is further divided into two classes of shares,  Class AARP and
Class S shares.

                                       8
<PAGE>

The  following   information   replaces  the  information   regarding  "Personal
Investments by Employees of the Adviser" on page 29:

Code of Ethics

The Fund,  the Adviser and  principal  underwriter  have each  adopted  codes of
ethics under rule 17j-1 of the Investment  Company Act. Board members,  officers
of the Fund and employees of the Adviser and principal underwriter are permitted
to make personal securities  transactions,  including transactions in securities
that  may be  purchased  or  held  by the  Fund,  subject  to  requirements  and
restrictions  set forth in the applicable Code of Ethics.  The Adviser's Code of
Ethics  contains  provisions and  requirements  designed to identify and address
certain  conflicts of interest  between personal  investment  activities and the
interests  of the  Fund.  Among  other  things,  the  Adviser's  Code of  Ethics
prohibits  certain types of  transactions  absent prior  approval,  imposes time
periods  during  which  personal   transactions  may  not  be  made  in  certain
securities,  and requires the submission of duplicate broker  confirmations  and
quarterly reporting of securities transactions. Additional restrictions apply to
portfolio  managers,  traders,  research  analysts  and others  involved  in the
investment  advisory  process.  Exceptions to these and other  provisions of the
Adviser's Code of Ethics may be granted in particular circumstances after review
by appropriate personnel.

The  following  information  replaces the  information  regarding  "Trustees and
Officers" on page 32:

<TABLE>
<CAPTION>
                    TRUSTEES AND OFFICERS OF INVESTMENT TRUST

                                                                                                  Position with
                                                                                                  Underwriter,
                                                                                                  Scudder Investor
Name, Age, and Address            Position with Fund      Principal Occupation**                  Services, Inc.
----------------------            ------------------      ----------------------                  --------------
<S>                               <C>                     <C>                                            <C>
Henry P. Becton, Jr. (56)         Trustee                 President and General Manager, WGBH             --
WGBH                                                      Educational Foundation
125 Western Avenue
Allston, MA 02134

Linda C. Coughlin (48)+*          Trustee                 Managing Director of Scudder Kemper     Senior Vice President
                                                          Investments, Inc.

Dawn-Marie Driscoll (53)          Trustee                 Executive Fellow, Center for Business           --
4909 SW 9th Place                                         Ethics, Bentley College; President,
Cape Coral, FL  33914                                     Driscoll Associates (consulting firm)

Edgar R. Fiedler (70)             Trustee                 Senior Fellow and Economic                      --
50023 Brogden                                             Counsellor, The Conference Board, Inc.
Chapel Hill, NC

Keith R. Fox (45)                 Trustee                 Private Equity Investor, President,             --
10 East 53rd Street                                       Exeter Capital Management Corporation
New York, NY  10022

                                       9
<PAGE>
                                                                                                  Position with
                                                                                                  Underwriter,
                                                                                                  Scudder Investor
Name, Age, and Address            Position with Fund      Principal Occupation**                  Services, Inc.
----------------------            ------------------      ----------------------                  --------------

Joan E. Spero (55)                Trustee                 President, Doris Duke Charitable                --
Doris Duke Charitable Foundation                          Foundation; Department of State -
650 Fifth Avenue                                          Undersecretary of State for Economic,
New York, NY  10128                                       Business and Agricultural Affairs
                                                          (March 1993 to January 1997)

Jean Gleason Stromberg (56)       Trustee                 Consultant; Director, Financial                 --
3816 Military Road, NW                                    Institutions Issues, U.S. General
Washington, D.C.                                          Accounting Office (1996-1997);
                                                          Partner, Fulbright & Jaworski Law
                                                          Firm (1978-1996)

Jean C. Tempel (56)               Trustee                 Managing Director, First Light Capital          --
One Boston Place, 23rd Floor
Boston, MA 02108

Steven Zaleznick (45)*            Trustee                 President and CEO, AARP Services, Inc.          --
(address)


Ann M. McCreary (43) #            Vice President          Managing Director of Scudder Kemper             --
                                                          Investments, Inc.


John R. Hebble (42)+              Treasurer               Senior Vice President of Scudder        Assistant Treasurer
                                                          Kemper Investments, Inc.

Caroline Pearson (38)+            Assistant Secretary     Senior Vice President of Scudder        Clerk
                                                          Kemper Investments, Inc.; Associate,
                                                          Dechert Price & Rhoads (law firm)
                                                          1989 - 1997

John Millette (37)+               Vice President and      Vice President of Scudder Kemper                --
                                  Secretary               Investments, Inc.
</TABLE>


*        Ms.  Coughlin  and Mr.  Zaleznick  are  considered  by the Fund and its
         counsel to be  "interested  persons"  of the Adviser or of the Trust as
         defined in the 1940 Act.
**       Unless  otherwise   stated,   all  officers  and  directors  have  been
         associated  with their  respective  companies for more than five years,
         but not necessarily in the same capacity.
+        Address:  Two International Place, Boston, Massachusetts 02110
#        Address:  345 Park Avenue, New York, New York 10154

         The Trustees and officers of the Trust also serve in similar capacities
with respect to other Scudder Funds. The  newly-constituted  Board may determine
to change its compensation structure.

         As of June 15, 2000, all Trustees and Officers of the fund, as a group,
owned  beneficially (as that term is defined in Section 13 (d) of The Securities
and Exchange Act of 1934) less than 1% of the outstanding shares.

                                       10
<PAGE>

         To the  knowledge  of the Fund,  as of June 15,  2000,  no person owned
beneficially more than 5% of the outstanding shares of the fund.

The following  information  regarding the "Administrative  Fee" is added on page
39:

Administrative Fee

         The Fund has entered  into an  administration  agreement  with  Scudder
Kemper (the "Administration  Agreement"),  pursuant to which Scudder Kemper will
provide  or pay  others  to  provide  substantially  all  of the  administrative
services required by the Fund (other than those provided by Scudder Kemper under
its  investment  management  agreement  and  current   Administrative   Services
Agreement with the Fund, as described  above) in exchange for the payment by the
Fund of an administrative  services fee (the "Administrative  Fee") of 0.250% of
its average daily net assets.  One effect of these  arrangements  is to make the
Fund's future expense ratio more predictable. The Administrative Fee will become
effective on or about September 11, 2000.

         Various third-party service providers (the "Service  Providers"),  some
of which are affiliated  with Scudder Kemper,  provide  certain  services to the
Fund  pursuant to separate  agreements  with the Fund.  Scudder Fund  Accounting
Corporation,  a subsidiary of Scudder  Kemper,  computes net asset value for the
Fund and maintains their accounting records. Scudder Service Corporation, also a
subsidiary  of  Scudder  Kemper,  is the  transfer,  shareholder  servicing  and
dividend-paying  agent for the shares of the Fund.  Scudder  Trust  Company,  an
affiliate of Scudder Kemper,  provides  subaccounting and recordkeeping services
for shareholders in certain retirement and employee benefit plans. As custodian,
State Street Bank and Trust Company holds the portfolio  securities of the Fund,
pursuant  to  a  custodian  agreement.  PricewaterhouseCoopers  LLP  audits  the
financial  statements  of the Fund and provides  other  audit,  tax, and related
services.  Dechert  Price & Rhoads  acts as  general  counsel  for the Fund.  In
addition to the fees they pay under the investment  management  agreements  with
Scudder  Kemper,  the Fund  pays the fees and  expenses  associated  with  these
service arrangements, as well as the Fund's insurance,  registration,  printing,
postage and other costs.

         Scudder  Kemper will pay the Service  Providers  for the  provision  of
their  services  to the  Fund  and  will  pay  other  Fund  expenses,  including
insurance, registration, printing and postage fees. In return, the Fund will pay
Scudder Kemper an Administrative Fee.

         The  Administration  Agreement  has an  initial  term of  three  years,
subject to earlier  termination by the Fund's Board. The fee payable by the Fund
to Scudder Kemper  pursuant to the  Administration  Agreements is reduced by the
amount of any credit received from the Fund's custodian for cash balances.

         Certain  expenses of the Fund will not be borne by Scudder Kemper under
the  Administration   Agreements,   such  as  taxes,  brokerage,   interest  and
extraordinary  expenses;  and the fees and expenses of the Independent  Trustees
(including the fees and expenses of their independent counsel). In addition, the
Fund  will  continue  to pay the fees  required  by its  current  Administrative
Services  Agreement with Scudder Kemper and would continue to bear,  indirectly,
the fees paid under the portfolio's  investment  advisory agreement with Bankers
Trust.

The following information regarding "Other Information" is added on page 46:

The CUSIP number of Scudder S&P 500 Index Fund Class AARP is 460965-775.



July 24, 2000

                                       11



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