DWS Core Plus Allocation Fund


Supplement to the currently effective Statements of Additional Information
("SAIs") for the above-listed fund.

The following information supplements information contained in "The Underlying
DWS Funds" sub-heading of the "Investment Policies and Techniques" section of
the fund's SAIs:

DWS U.S. Bond Index Fund. The fund seeks to replicate, as closely as possible,
before the deduction of expenses, the performance of the Lehman Brothers U.S.
Aggregate Index, which emphasizes government mortgage-backed securities and
corporate investment grade debt securities. The fund pursues its objective by
investing primarily in the debt securities of the companies included in the
Lehman Brothers U.S. Aggregate Index and derivative instruments, such as futures
contracts and options, that provide exposure to the securities in the Lehman
Brothers U.S. Aggregate Index.

DWS RREEF Global Infrastructure Fund. The fund seeks total return from both
capital appreciation and current income through investment in a global portfolio
of securities of infrastructure-related companies. Under normal circumstances,
the fund invests at least 80% of its net assets in the securities of US and
non-US infrastructure-related companies. The fund considers a company to be an
infrastructure-related company if at least 50% of its non-cash assets are
infrastructure assets or 50% of its gross income or net profits are derived,
directly or indirectly, from the ownership, management, construction, operation,
utilization or financing of infrastructure assets. Under normal circumstances,
the fund invests principally in equity securities, though the fund may also
invest in fixed-income securities without limitation. The fund may invest in
common and preferred stock (including convertible securities), rights or
warrants to purchase common stock, debt securities and listed limited
partnership interests. Under normal circumstances, the majority of the fund's
assets are invested in securities of issuers organized or located outside the US
or doing a substantial amount of business outside the US. The fund allocates its
assets among various regions and countries, including exposure to emerging
market countries.

The above funds are also added to the list of Underlying DWS Funds contained in
the SAIs for DWS Core Plus Allocation Fund.

The following information supplements information contained in the "Investment
Policies and Techniques of the Underlying DWS Funds" section of the fund's SAIs:

Fixed Income Securities and Money Market Instruments

General. (U.S. Bond Index Fund only -- but only for domestic fixed income
securities.) The Fund may invest in a broad range of domestic fixed income
(debt) securities. Fixed income securities, including (but not limited to)
bonds, are used by issuers to borrow money from investors. The issuer pays the
investor a fixed or variable rate of interest, and must repay the amount
borrowed at maturity. Some debt securities, such as zero coupon bonds, do not
pay current interest, but are purchased at a discount from their face values.

The value of fixed income securities in the Fund generally varies inversely with
changes in interest rates. Prices of fixed income securities with longer
effective maturities are more sensitive to interest rate changes than those with
shorter effective maturities.

In periods of declining interest rates, the yield (the income generated over a
stated period of time) of the Fund that invests in fixed income securities may
tend to be higher than prevailing market rates, and in periods of rising
interest rates, the yield of the Fund may tend to be lower. Also, when interest
rates are falling, the inflow of net new money to the Fund from the continuous
sale of its shares will likely be invested in portfolio instruments producing
lower yields than the balance of the Fund, thereby reducing the yield of the
Fund. In periods of rising interest rates, the opposite can be true. The net
asset value of the Fund investing in fixed income securities can generally be
expected to change as general levels of interest rates fluctuate.



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Fixed Income Security Risk. Fixed income securities generally expose the fund to
five types of risk: (1) interest rate risk (the potential for fluctuations in
bond prices due to changing interest rates); (2) income risk (the potential for
a decline in the fund's income due to falling market interest rates); (3) credit
risk (the possibility that a bond issuer will fail to make timely payments of
either interest or principal to the fund); (4) prepayment risk or call risk (the
likelihood that, during periods of falling interest rates, securities with high
stated interest rates will be prepaid, or "called" prior to maturity, requiring
the fund to invest the proceeds at generally lower interest rates); and (5)
extension risk (the likelihood that as interest rates increase, slower than
expected principal payments may extend the average life of fixed income
securities, which will have the effect of locking in a below-market interest
rate, increasing the security's duration and reducing the value of the
security).

Short-Term Instruments. When the fund experiences large cash inflows, for
example, through the sale of securities or of their shares and attractive
investments are unavailable in sufficient quantities, the fund may hold
short-term investments (or shares of money market mutual funds) for a limited
time pending availability of such investments.

Short-term instruments consist of foreign and domestic: (1) short-term
obligations of sovereign governments, their agencies, instrumentalities,
authorities or political subdivisions; (2) other investment grade short-term
debt securities; (3) investment grade commercial paper; (4) bank obligations,
including negotiable certificates of deposit, time deposits and bankers'
acceptances; and (5) repurchase agreements. At the time a fund invests in
commercial paper, bank obligations or repurchase agreements, the issuer or the
issuer's parent must have outstanding debt, commercial paper or bank obligations
rated investment grade; or, if no such ratings are available, the instrument
must be deemed to be of comparable quality in the opinion of the portfolio
management team. These instruments may be denominated in US dollars or in
foreign currencies.

At the time the fund invests in commercial paper, bank obligations or repurchase
agreements, the issuer of the issuer's parent must have outstanding debt rated
AA or higher by S&P or Aa or higher by Moody's or outstanding commercial paper
or bank obligations rated A-1 by S&P or Prime-1 by Moody's; or, if no such
ratings are available, the instrument must be of comparable quality in the
opinion of the portfolio management team. These instruments may be denominated
in US dollars or in foreign currencies.

Obligations of Banks and Other Financial Institutions. The fund may invest in US
dollar-denominated fixed rate or variable rate obligations of US or foreign
financial institutions, including banks. Obligations of domestic and foreign
financial institutions in which the fund may invest include (but are not limited
to) certificates of deposit, bankers' acceptances, bank time deposits,
commercial paper, and other US dollar-denominated instruments issued or
supported by the credit of US or foreign financial institutions, including
banks.

For purposes of a fund's investment policies with respect to bank obligations,
the assets of a bank will be deemed to include the assets of its domestic and
foreign branches. Obligations of foreign branches of US banks and foreign banks
may be general obligations of the parent bank in addition to the issuing bank or
may be limited by the terms of a specific obligation and by government
regulation. The fund may invest in obligations of foreign banks or foreign
branches of US banks, which include banks located in the United Kingdom, Grand
Cayman Island, Nassau, Japan and Canada.

Investments in these obligations may entail risks that are different from those
of investments in obligations of US domestic banks because of differences in
political, regulatory and economic systems and conditions. These risks include
future political and economic developments, currency blockage, the possible
imposition of withholding taxes on interest payments, possible seizure or
nationalization of foreign deposits, difficulty or inability of pursuing legal
remedies and obtaining judgments in foreign courts, possible establishment of
exchange controls or the adoption of other foreign governmental restrictions
that might affect adversely the payment of principal and interest on bank
obligations. Foreign branches of US banks and foreign banks may also be subject
to less stringent reserve requirements and to different accounting, auditing,
reporting and record keeping standards than those applicable to domestic
branches of US banks.



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Government Guaranteed Mortgage-Backed Securities. DWS U.S. Bond Index Fund's
investments in mortgage-backed securities may include securities issued or
guaranteed by the US government or one of its agencies, authorities,
instrumentalities or sponsored enterprises, such as Ginnie Mae, Fannie Mae and
Freddie Mac. There are several types of guaranteed mortgage-backed securities
currently available, including guaranteed mortgage pass-through certificates and
multiple class securities, which include guaranteed Real Estate Mortgage
Investment Conduit Certificates ("REMIC Certificates"), collateralized mortgage
obligations and stripped mortgage-backed securities. The fund is permitted to
invest in other types of mortgage-backed securities that may be available in the
future to the extent consistent with its investment policies and objective.

Ginnie Mae Certificates. DWS U.S. Bond Index Fund may purchase Ginnie Mae
Certificates. Ginnie Mae is a wholly owned corporate instrumentality of the
United States within the Department of Housing and Urban Development. The
National Housing Act of 1934, as amended (the "Housing Act"), authorizes Ginnie
Mae to guarantee the timely payment of the principal of and interest on
certificates that are based on and backed by a pool of mortgage loans insured by
the Federal Housing Administration under the Housing Act, or Title V of the
Housing Act of 1949 ("FHA Loans"), or guaranteed by the Department of Veterans
Affairs under the Servicemen's Readjustment Act of 1944, as amended ("VA
Loans"), or by pools of other eligible mortgage loans. The Housing Act provides
that the full faith and credit of the US government is pledged to the payment of
all amounts that may be required to be paid under any Ginnie Mae guaranty. In
order to meet its obligations under such guaranty, Ginnie Mae is authorized to
borrow from the US Treasury with no limitations as to amount.

The Ginnie Mae Certificates in which the fund may invest will represent a pro
rata interest in one or more pools of the following types of mortgage loans: (1)
fixed-rate level payment mortgage loans; (2) fixed-rate graduated payment
mortgage loans; (3) fixed-rate growing equity mortgage loans; (4) fixed-rate
mortgage loans secured by manufactured (mobile) homes; (5) mortgage loans on
multifamily residential properties under construction; (6) mortgage loans on
completed multifamily projects; (7) fixed-rate mortgage loans as to which
escrowed funds are used to reduce the borrower's monthly payments during the
early years of the mortgage loans ("buy down" mortgage loans); (8) mortgage
loans that provide for adjustments in payments based on periodic changes in
interest rates or in other payment terms of the mortgage loans; and (9)
mortgage-backed serial notes.

Fannie Mae Certificates. DWS U.S. Bond Index Fund may purchase Fannie Mae
Certificates. The obligations of Fannie Mae are not backed by the full faith and
credit of the US government. Each Fannie Mae Certificate will represent a pro
rata interest in one or more pools of FHA Loans, VA Loans or conventional
mortgage loans (i.e., mortgage loans that are not insured or guaranteed by any
governmental agency) of the following types: (1) fixed-rate level payment
mortgage loans; (2) fixed-rate growing equity mortgage loans; (3) fixed-rate
graduated payment mortgage loans; (4) variable rate mortgage loans; (5) other
adjustable rate mortgage loans; and (6) fixed-rate and adjustable mortgage loans
secured by multifamily projects.

Freddie Mac Certificates. DWS U.S. Bond Index Fund may purchase Freddie Mac
Certificates. The obligations of Freddie Mac are obligations solely of Freddie
Mac and are not backed by the full faith and credit of the US government.
Freddie Mac Certificates represent a pro rata interest in a group of mortgage
loans (a "Freddie Mac Certificate group") purchased by Freddie Mac. The mortgage
loans underlying the Freddie Mac Certificates will consist of fixed-rate or
adjustable rate mortgage loans with original terms to maturity of between ten
and thirty years, substantially all of which are secured by first liens on one-
to four-family residential properties or multifamily projects. Each mortgage
loan must meet the applicable standards set forth in the Emergency Home Finance
Act of 1970, as amended. A Freddie Mac Certificate group may include whole
loans, participating interests in whole loans and undivided interests in whole
loans and participations comprising another Freddie Mac Certificate group.

Stripped Mortgage-Backed Securities. DWS U.S. Bond Index Fund may purchase
stripped mortgage-backed securities ("SMBS"), which are derivative multi-class
mortgage securities. The market value of the class consisting entirely of
principal payments generally is unusually volatile in response to changes in
interest rates. The yields on a class of SMBS that receives all or most of the
interest from the mortgaged assets are generally higher than prevailing market
yields on other mortgage-backed securities because their cash flow patterns are
more volatile and there is a greater risk that the initial investment will not
be fully recouped. See "Illiquid Securities."



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In accordance with a requirement imposed by the staff of the Securities and
Exchange Commission (the "SEC"), the portfolio management team will consider
privately issued fixed rate IOs and POs to be illiquid securities for purposes
of the Fund's limitation on investments in illiquid securities. Unless the
portfolio management team determines that a particular government-issued fixed
rate IO or PO is liquid, it will also consider these IOs and POs to be illiquid.

Adjustable Rate Mortgages-Interest Rate Indices. DWS U.S. Bond Index Fund may
invest in adjustable rate mortgages which may be adjusted on the basis of one of
several indices. The One Year Treasury Index is the figure derived from the
average weekly quoted yield on US Treasury securities adjusted to a constant
maturity of one year. The Cost of Funds Index reflects the monthly weighted
average cost of funds of savings and loan associations and savings banks whose
home offices are located in Arizona, California and Nevada (the "FHLB Eleventh
District") that are member institutions of the Federal Home Loan Bank of San
Francisco (the "FHLB of San Francisco"), as computed from statistics tabulated
and published by the FHLB of San Francisco. The FHLB of San Francisco normally
announces the Cost of Funds Index on the last working day of the month following
the month in which the cost of funds was incurred.

A number of factors affect the performance of the Cost of Funds Index and may
cause the Cost of Funds Index to move in a manner different from indices based
upon specific interest rates, such as the One Year Treasury Index. Because of
the various origination dates and maturities of the liabilities of members of
the FHLB Eleventh District upon which the Cost of Funds Index is based, among
other things, at any time the Cost of Funds Index may not reflect the average
prevailing market interest rates on new liabilities of similar maturities. There
can be no assurance that the Cost of Funds Index will necessarily move in the
same direction or at the same rate as prevailing interest rates, since as longer
term deposits or borrowings mature and are renewed at market interest rates, the
Cost of Funds Index will rise or fall depending upon the differential between
the prior and the new rates on such deposits and borrowings. In addition,
dislocations in the thrift industry in recent years have caused and may continue
to cause the cost of funds of thrift institutions to change for reasons
unrelated to changes in general interest rate levels. Furthermore, any movement
in the Cost of Funds Index as compared to other indices based upon specific
interest rates may be affected by changes instituted by the FHLB of San
Francisco in the method used to calculate the Cost of Funds Index. To the extent
that the Cost of Funds Index may reflect interest changes on a more delayed
basis than other indices, in a period of rising interest rates, any increase may
produce a higher yield later than would be produced by such other indices, and
in a period of declining interest rates, the Cost of Funds Index may remain
higher than other market interest rates which may result in a higher level of
principal prepayments on mortgage loans which adjust in accordance with the Cost
of Funds Index than mortgage loans which adjust in accordance with other
indices.

LIBOR, the London InterBank Offered Rate, is the interest rate that the most
creditworthy international banks dealing in US dollar-denominated deposits and
loans charge each other for large dollar-denominated loans. LIBOR is also
usually the base rate for large dollar-denominated loans in the international
market. LIBOR is generally quoted for loans having rate adjustments at one,
three, six or twelve month intervals.

Mortgage-Backed Securities and Asset-Backed Securities -- Types of Credit
Support. Mortgage-backed securities and asset-backed securities are often backed
by a pool of assets representing the obligations of a number of different
parties. To lessen the effect of failure by obligors on underlying assets to
make payments, such securities may contain elements of credit support. Such
credit support falls into two categories: (1) liquidity protection and (2)
protection against losses resulting from ultimate default by an obligor on the
underlying assets. Liquidity protection refers to the provision of advances,
generally by the entity administering the pool of assets, to ensure that the
pass-through of payments due on the underlying pool occurs in a timely fashion.
Protection against losses resulting from ultimate default enhances the
likelihood of ultimate payment of the obligations on at least a portion of the
assets in the pool. Such protection may be provided through guarantees,
insurance policies or letters of credit obtained by the issuer or sponsor from
third parties; through various means of structuring the transaction; or through
a combination of such approaches. The fund will not usually pay any additional
fees for such credit support, although the existence of credit support may
increase the price of a security.



                                       4
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The ratings of mortgage-backed securities and asset-backed securities for which
third-party credit enhancement provides liquidity protection or protection
against losses from default are generally dependent upon the continued
creditworthiness of the provider of the credit enhancement. The ratings of such
securities could be subject to reduction in the event of deterioration in the
creditworthiness of the credit enhancement provider even in cases where the
delinquency and loss experience on the underlying pool of assets is better than
expected.

Examples of credit support arising out of the structure of the transaction
include "senior-subordinated securities" (multiple class securities with one or
more classes subordinate to other classes as to the payment of principal thereof
and interest thereon, with the result that defaults on the underlying assets are
borne first by the holders of the subordinated class), creation of "reserve
funds" (where cash or investments, sometimes funded from a portion of the
payments on the underlying assets, are held in reserve against future losses)
and "over-collateralization" (where the scheduled payments on, or the principal
amount of, the underlying assets exceed those required to make payment of the
securities and pay any servicing or other fees). The degree of credit support
provided for each issue is generally based on historical information with
respect to the level of credit risk associated with the underlying assets.
Delinquency or losses in excess of that which is anticipated could adversely
affect the return on an investment in such a security.

Yankee Bonds. DWS U.S. Bond Index Fund may invest in Yankee bonds. Yankee Bonds
are US dollar-denominated bonds sold in the US by non-US issuers. As compared
with bonds issued in the US, such bond issues normally carry an interest rate
but are less actively traded. Investing in the securities of foreign companies
involves more risks than investing in securities of US companies. Their value is
subject to economic and political developments in the countries where the
companies operate and to changes in foreign currency values. Values may also be
affected by foreign tax laws, changes in foreign economic or monetary policies,
exchange control regulations and regulations involving prohibitions on the
repatriation of foreign currencies. In many foreign countries, there is less
publicly available information about foreign issuers, and there is less
government regulation and supervision of foreign stock exchanges, brokers and
listed companies. Also in many foreign countries, companies are not subject to
uniform accounting, auditing, and financial reporting standards comparable to
those applicable to domestic issuers. Security trading practices and custody
arrangements abroad may offer less protection to the fund's investments and
there may be difficulty in enforcing legal rights outside the United States.
Settlement of transactions in some foreign markets may be delayed or may be less
frequent than in the United States which could affect the liquidity of the
fund's portfolio. Additionally, in some foreign countries, there is the
possibility of expropriation or confiscatory taxation, limitations on the
removal of securities, property, or other fund assets, political or social
instability or diplomatic developments which could affect investments in foreign
securities. In addition, the relative performance of various countries' fixed
income markets historically has reflected wide variations relating to the unique
characteristics of each country's economy. Year-to-year fluctuations in certain
markets have been significant, and negative returns have been experienced in
various markets from time to time.

Yield Curve Options. DWS U.S. Bond Index Fund may enter into options on the
yield spread or yield differential between two securities. These options are
referred to as yield curve options. In contrast to other types of options, a
yield curve option is based on the difference between the yields of designated
securities, rather than the prices of the individual securities, and is settled
through cash payments. Accordingly, a yield curve option is profitable to the
holder if this differential widens (in the case of a call) or narrows (in the
case of a put), regardless of whether the yields of the underlying securities
increase or decrease.

Spreadlocks. DWS U.S. Bond Index Fund may enter into spreadlocks. A spreadlock
is a form of swap contract that involves an exchange of a one-time cash payment
based on a specific financial index between the fund and another party. A
spreadlock allows an interest rate swap user to lock in the forward differential
between the interest rate swap rate and the yield of the government bond
underlying the swap. Essentially, a spreadlock allows the investor to buy or
sell the spread forward by entering into a forward contract on the swap spread
(i.e., the spread between the government yield and the swap rate (or yield)) for
a given maturity. The price of a spreadlock is determined by the yield spread
between a forward starting fixed/floating swap and a forward transaction in a
government bond. The value of the swap is adjusted daily and the change in value
is recorded as unrealized


                                       5
<PAGE>

appreciation or depreciation until the agreement matures, at which time the cash
payment, based on the value of the swap on the maturity date, is exchanged
between the two parties.

Short Sales. DWS RREEF Global Infrastructure Fund may engage in short sales, if,
at the time of the short sale, the fund owns or has the right to acquire
securities equivalent in kind and amount to the securities being sold short.

In a short sale, the seller does not immediately deliver the securities sold and
is said to have a short position in those securities until delivery occurs. To
make delivery to the purchaser, the executing broker borrows the securities
being sold short on behalf of the seller. While the short position is
maintained, the seller collateralizes its obligation to deliver the securities
sold short in an amount equal to the proceeds of the short sale plus an
additional margin amount established by the Board of Governors of the Federal
Reserve. If the fund engages in a short sale, the collateral account will be
maintained by State Street Bank and Trust Company, the fund's custodian. While
the short sale is open, the fund will maintain, in a segregated custodial
account, an amount of securities convertible into, or exchangeable for, such
equivalent securities at no additional cost. These securities would constitute
the fund's long position.

The fund may make a short sale, as described above, when it wants to sell the
security it owns at a current attractive price, but also wishes to defer
recognition of gain or loss for federal income tax purposes. There will be
certain additional transaction costs associated with short sales, but the fund
will endeavor to offset these costs with returns from the investment of the cash
proceeds of short sales.

Non-diversification. DWS RREEF Global Infrastructure Fund is classified as a
non-diversified management investment company under the 1940 Act, which means
that the fund is not limited by the 1940 Act in the proportion of its assets
that it may invest in the obligations of a single issuer. The investment of a
large percentage of the fund's assets in the securities of a small number of
issuers may cause the fund's share price to fluctuate more than that of a
diversified fund.










               Please Retain This Supplement for Future Reference












September 29, 2008