0000703642 dwsmmt:S000034486Member dwsmmt:C000106004Member 2011-11-02 2012-11-01 0000703642 dwsmmt:S000034486Member 2011-11-02 2012-11-01 0000703642 2011-11-02 2012-11-01 pure iso4217:USD 2012-09-30 <div style="display:none">~ http://www.dbadvisorsliquidity.com/role/ScheduleShareholderFeesDailyAssetsFundInstitutional column period compact * ~</div> 115 0.0109 EXAMPLE www.dbadvisorsliquidity.com/US 18 Daily Assets Fund Institutional SHAREHOLDER FEES (paid directly from your investment) ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a % of the value of your investment) How a fund's returns vary from year to year can give an idea of its risk. Best Quarter: 1.36%, Q3 2007 Worst Quarter: 0.04%, Q3 2011 Year-to-Date as of 9/30/12: 0.18% 0.0018 <div style="display:none">~ http://www.dbadvisorsliquidity.com/role/ScheduleAnnualFundOperatingExpensesDailyAssetsFundInstitutional column period compact * ~</div> 485BPOS 2012-06-30 DWS MONEY MARKET TRUST 2012-10-24 -0.0003 65 0.0185 0.0019 0.0221 Investment Objective These are the fees and expenses you may pay when you buy and hold shares. This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses (including one year of capped expenses for each period) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Principal Investment Strategy Average Annual Total Returns (for periods ended 12/31/2011 expressed as a %) 0.0136 <div style="display:none">~ http://www.dbadvisorsliquidity.com/role/ScheduleAnnualTotalReturnsDailyAssetsFundInstitutionalBarChart column period compact * ~</div> 0000703642 false 2012-11-01 2012-11-01 0 0 0.0011 0.0021 0.0018 0.014 0.0331 0.0543 0.0303 0.0057 0.0025 0.0019 Fees and Expenses of the Fund The Advisor has contractually agreed through October 31, 2013 to maintain the fund's total annual operating expenses, excluding extraordinary expenses, taxes, brokerage and interest expense at 0.18%. The agreement may only be terminated with the consent of the fund's Board. The fund is managed in accordance with Rule 2a-7 under the Investment Company Act of 1940, as amended, which governs the quality, maturity, diversity and liquidity of instruments in which a money market fund may invest. The fund invests in high quality, short-term, US dollar denominated money market instruments, including obligations of US and foreign banks, corporate obligations, US government securities, repurchase agreements and asset backed securities, paying a fixed, variable or floating interest rate. Under normal market conditions, the fund will invest more than 25% of its total assets in the obligations of banks and other financial institutions that satisfy the fund's eligibility requirements. The fund may invest up to 10% of its total assets in other money market mutual funds. Working in consultation with portfolio management, a credit team screens potential securities and develops a list of those that the fund may buy. Portfolio management, looking for attractive yield and weighing considerations such as credit quality, economic outlooks and possible interest rate movements, then decides which securities on this list to buy. There are several risk factors that could reduce the yield you get from the fund, cause the fund's performance to trail that of other investments, or cause you to lose money. Money market fund risk. An investment in the fund is not insured or guaranteed by the FDIC or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed, and if it falls below $1.00 you would lose money. The Advisor is not obligated to take any action to maintain the $1.00 share price. The share price could fall below $1.00 as a result of the actions of one or more large investors in the fund. The credit quality of the fund's holdings can change rapidly in certain markets, and the default of a single holding could cause the fund's share price to fall below $1.00, as could periods of high redemption pressures and/or illiquid markets. Interest rate risk. Rising interest rates could cause the value of the fund's investments and therefore its share price as well to decline. Conversely, any decline in interest rates is likely to cause the fund's yield to decline, and during periods of unusually low interest rates, the fund's yield may approach zero. A low interest rate environment may prevent the fund from providing a positive yield or paying fund expenses out of current income and, at times, could impair the fund's ability to maintain a stable $1.00 share price. Over time, the total return of a money market fund may not keep pace with inflation, which could result in a net loss of purchasing power for long-term investors. Credit risk. The fund's performance could be hurt if an issuer of a money market instrument suffers an adverse change in financial condition that results in a payment default, security downgrade or inability to meet a financial obligation. The credit quality of the fund's holdings can change rapidly in certain markets, and the default of a single holding could cause the fund's share price to fall below $1.00. Liquidity risk. The liquidity of portfolio securities can deteriorate rapidly due to credit events affecting issuers or guarantors or due to general market conditions and a lack of willing buyers. When there are no willing buyers and an instrument cannot be readily sold at a desired time or price, the fund may have to accept a lower price or may not be able to sell the instrument at all. An inability to sell one or more portfolio securities can adversely affect the fund's ability to maintain a $1.00 share price or prevent the fund from being able to take advantage of other investment opportunities. Unusual market conditions, an unusually high volume of redemption requests, or other similar conditions, could cause the fund to be unable to pay redemption proceeds within a short period of time. If the fund is forced to sell securities at an unfavorable time and/or under unfavorable conditions, such sales may adversely affect the fund's ability to maintain a $1.00 share price. Security selection risk. Although short-term securities are relatively stable investments, it is possible that the securities in which the fund invests will not perform as expected. This could cause the fund's returns to lag behind those of similar money market mutual funds and could result in a decline in share price. Repurchase agreement risk. If the party that sells the securities to the fund defaults on its obligation to repurchase them at the agreed-upon time and price, the fund could lose money. Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund. Concentration risk. Any fund that concentrates in a particular segment of the market will generally be more volatile than a fund that invests more broadly. Any market price movements, regulatory or technological changes, or economic conditions affecting banks or financial institutions will have a significant impact on the fund's performance. Prepayment and extension risk. When interest rates fall, issuers of high interest debt obligations may pay off the debts earlier than expected (prepayment risk), and the fund may have to reinvest the proceeds at lower yields. When interest rates rise, issuers of lower interest debt obligations may pay off the debts later than expected (extension risk), thus keeping the fund's assets tied up in lower interest debt obligations. Ultimately, any unexpected behavior in interest rates could increase the volatility of the fund's yield and could hurt fund performance. Prepayments could also create capital gains tax liability in some instances. Foreign investment risk. Foreign investments include certain special risks, such as unfavorable political and legal developments, limited financial information, regulatory risk and economic and financial instability. Regulatory risk. In 2010, the SEC adopted amendments to then-existing money market fund regulations, imposing new liquidity, credit quality, and maturity requirements on all money market funds. The SEC may adopt additional amendments to these regulations in the future that may affect the fund's operations and/or return potential. Past Performance Past performance may not indicate future results. CALENDAR YEAR TOTAL RETURNS (%) Total returns would have been lower if operating expenses hadn't been reduced. Year-to-Date 2007-09-30 Worst Quarter: 2011-09-30 <div style="display:none">~ http://www.dbadvisorsliquidity.com/role/ScheduleAverageAnnualTotalReturnsTransposedDailyAssetsFundInstitutional column period compact * ~</div> October 31, 2013 Under normal market conditions, the fund will invest more than 25% of its total assets in the obligations of banks and other financial institutions that satisfy the fund's eligibility requirements. There are several risk factors that could reduce the yield you get from the fund, cause the fund's performance to trail that of other investments, or cause you to lose money. 0.001 265 0.051 0.0187 The fund seeks a high level of current income consistent with liquidity and the preservation of capital. Main Risks How a fund's returns vary from year to year can give an idea of its risk. Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. The 7-day yield, which is often referred to as the "current yield," is the income generated by the fund over a seven-day period. This amount is then annualized, which means that we assume the fund generates the same income every week for a year. For more recent performance figures and the current yield, go to www.dbadvisorsliquidity.com/US (the Web site does not form a part of this prospectus) or call the phone number for your share class included in this prospectus. Best Quarter: 0.0004 <div style="display:none">~ http://www.dbadvisorsliquidity.com/role/ScheduleExpenseExampleTransposedDailyAssetsFundInstitutional column period compact * ~</div> Money market fund risk. An investment in the fund is not insured or guaranteed by the FDIC or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed, and if it falls below $1.00 you would lose money. The Advisor is not obligated to take any action to maintain the $1.00 share price. The share price could fall below $1.00 as a result of the actions of one or more large investors in the fund. The credit quality of the fund's holdings can change rapidly in certain markets, and the default of a single holding could cause the fund's share price to fall below $1.00, as could periods of high redemption pressures and/or illiquid markets. An investment in the fund is not insured or guaranteed by the FDIC or any other government agency.