DFA Commodity Strategy Portfolio

DFA Commodity Strategy Portfolio

INVESTMENT OBJECTIVE

The investment objective of the DFA Commodity Strategy Portfolio is to seek total return consisting of capital appreciation and current income.

FEES AND EXPENSES OF THE PORTFOLIO

This table describes the fees and expenses you may pay if you buy and hold shares of the DFA Commodity Strategy Portfolio.

Shareholder Fees (fees paid directly from your investment):

Shareholder Fees - (USD $)	DFA Commodity Strategy Portfolio The DFA Commodity Strategy Portfolio
Shareholder Fees (fees paid directly from your investment)	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses -	DFA Commodity Strategy Portfolio The DFA Commodity Strategy Portfolio
Management Fee	0.30%
Other Expenses	0.16%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	0.47%

Example

This Example is meant to help you compare the cost of investing in the DFA Commodity Strategy Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio 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 Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example - (USD $)	1 Year	3 Years	5 Years	10 Years
DFA Commodity Strategy Portfolio The DFA Commodity Strategy Portfolio	48	151	263	591

Portfolio Turnover

The DFA Commodity Strategy Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the DFA Commodity Strategy Portfolio's performance. During the most recent fiscal year, the DFA Commodity Strategy Portfolio's portfolio turnover rate was 50% of the average of its investment portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Dimensional Fund Advisors LP (the "Advisor") believes that commodity and fixed income investing should involve a long-term view and a systematic focus on risk and return, instead of focusing on forecasting or market timing.

The DFA Commodity Strategy Portfolio seeks to achieve its investment objective by generally investing in a universe of allowable commodity-linked derivative instruments and fixed income investment opportunities.

The DFA Commodity Strategy Portfolio gains exposure to commodities markets by investing in derivative instruments, such as structured notes whose principal and/or coupon payments are linked to commodities or commodity indices, in swap agreements, and/or in other commodity-linked instruments (such as futures contracts on individual commodities or commodity indices). The DFA Commodity Strategy Portfolio may invest up to 25% of its total assets in Dimensional Cayman Commodity Fund I Ltd. (the "Subsidiary"), a wholly-owned subsidiary of the Portfolio formed in the Cayman Islands, which has the same investment objective as the Portfolio and has a strategy of investing in derivative instruments, such as commodity-linked swap agreements and other commodity-linked instruments, futures contracts on individual commodities, and options on these instruments. The DFA Commodity Strategy Portfolio, directly and/or through its investment in the Subsidiary, expects to use such derivatives extensively as part of its investment strategy.

In pursuing the fixed income portion of the DFA Commodity Strategy Portfolio's investment strategy, the Advisor identifies a broadly-diversified universe of eligible U.S. and foreign fixed income securities with precisely-defined maturity ranges and credit quality characteristics. The Advisor will then seek to purchase a broad and diverse portfolio of securities meeting these credit quality standards. In making these purchase decisions, if the anticipated maturity risk premium is greater for longer-term securities in the eligible maturity range, the Advisor will focus investment in that longer-term area; otherwise, the DFA Commodity Strategy Portfolio will focus investment in the short-term range of the eligible maturity range.

The DFA Commodity Strategy Portfolio will invest in obligations issued or guaranteed by the U.S. and foreign governments, their agencies and instrumentalities, bank obligations, commercial paper, repurchase agreements, obligations of other domestic and foreign issuers having investment grade ratings (i.e., rated AAA to BBB- by Standard & Poor's Rating Group ("S&P") or Fitch Ratings Ltd. ("Fitch") or Aaa to Baa3 by Moody's Investors Service, Inc. ("Moody's")), securities of domestic or foreign issuers denominated in U.S. dollars but not trading in the United States, and obligations of supranational organizations. At the present time, the Advisor expects that most fixed income investments will be made in the obligations of issuers that are located in developed countries. However, in the future, the Advisor anticipates investing in issuers located in other countries as well. The fixed income securities in which the Portfolio invests are considered investment grade at the time of purchase.

The DFA Commodity Strategy Portfolio's fixed income securities primarily will mature within five years from the date of settlement, and the Portfolio maintains an average portfolio duration of three years or less. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security's price to changes in interest rates. The longer a security's duration, the more sensitive it will be to changes in interest rates. Similarly, a portfolio with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration.

The DFA Commodity Strategy Portfolio's investments may include foreign securities denominated in foreign currencies. The DFA Commodity Strategy Portfolio intends to hedge foreign currency exposure to protect against uncertainty in the level of future foreign currency rates, to hedge against fluctuations in currency exchange rates or to transfer balances from one currency to another. The DFA Commodity Strategy Portfolio may hedge such currency exposure by entering into foreign forward currency contracts. The DFA Commodity Strategy Portfolio also may enter into credit default swaps on issuers or indices to buy or sell credit protection to hedge its credit exposure, gain market or issuer exposure without owning the underlying securities, or increase the Portfolio's expected total return.

The DFA Commodity Strategy Portfolio is "non-diversified," which means that the Portfolio may invest its assets in a smaller number of issuers than a diversified fund.

The DFA Commodity Strategy Portfolio may lend its portfolio securities to generate additional income.

PRINCIPAL RISKS

Market Risk: Even a long-term investment approach cannot guarantee a profit. Economic, political, and issuer-specific events will cause the value of securities, and the DFA Commodity Strategy Portfolio that owns them, to rise or fall. Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money.

Commodity Risk: The value of commodity-linked derivative instruments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, embargoes, tariffs, and international economic, political, and regulatory developments.

Use of leveraged commodity-linked derivatives creates an opportunity for increased return but, at the same time, creates the possibility for greater loss (including the likelihood of greater volatility of the DFA Commodity Strategy Portfolio's net asset value), and there can be no assurance that the Portfolio's use of leverage will be successful.

Derivatives Risk: Derivatives can be used for hedging (attempting to reduce risk by offsetting one investment position with another) or non-hedging purposes. While hedging can reduce or eliminate losses, it also can reduce or eliminate gains. The use of derivatives for non-hedging purposes may be considered more speculative than other types of investments. When the DFA Commodity Strategy Portfolio uses derivatives, the Portfolio will be directly exposed to the risks of those derivatives. Derivative instruments are subject to a number of risks, including commodity, correlation, interest rate, liquidity, market, credit and management risks, and the risk of improper valuation. The DFA Commodity Strategy Portfolio also may use derivatives for leverage. The DFA Commodity Strategy Portfolio's use of derivatives, particularly commodity-linked derivatives, involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate, or index, and the DFA Commodity Strategy Portfolio could lose more than the principal amount invested. For example, potential losses from commodity-linked notes or swap agreements can be unlimited. Additional risks are associated with the use of credit default swaps, including counterparty and credit risk (the risk that the other party to a swap agreement will not fulfill its contractual obligations, whether because of bankruptcy or other default) and liquidity risk (the possible lack of a secondary market for the swap agreement). Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that the DFA Commodity Strategy Portfolio will engage in these transactions to reduce exposure to other risks when that would be beneficial.

Focus Risk: The DFA Commodity Strategy Portfolio may be exposed, from time to time, to the performance of a small number of commodity sectors (e.g., energy, metals or agricultural), which may represent a large portion of the Portfolio. As a result, the DFA Commodity Strategy Portfolio may be subject to greater volatility than if the Portfolio were more broadly diversified among commodity sectors.

Non-Diversification Risk: The risk that the DFA Commodity Strategy Portfolio may be more volatile than a diversified fund because the Portfolio invests its assets in a smaller number of issuers. The gains or losses on a single security, therefore, may have a greater impact on the Portfolio's net asset value.

Foreign Securities and Currencies Risk: Foreign securities prices may decline or fluctuate because of: (a) economic or political actions of foreign governments, and/or (b) less regulated or liquid securities markets. Investors holding these securities may also be exposed to foreign currency risk (the possibility that foreign currency will fluctuate in value against the U.S. dollar or that a foreign government will convert, or be forced to convert, its currency to another currency, changing its value against the U.S. dollar). The DFA Commodity Strategy Portfolio seeks to hedge foreign currency exposure.

Foreign Government Debt Risk. The risk that: (a) the governmental entity that controls the repayment of government debt may not be willing or able to repay the principal and/or to pay the interest when it becomes due, due to factors such as political considerations, the relative size of the governmental entity's debt position in relation to the economy, cash flow problems, insufficient foreign currency reserves, the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies, and/or other national economic factors; (b) governments may default on their debt securities, which may require holders of such securities to participate in debt rescheduling; and (c) there is no legal or bankruptcy process by which defaulted government debt may be collected in whole or in part.

Interest Rate Risk: Fixed income securities are subject to interest rate risk because the prices of fixed income securities tend to move in the opposite direction of interest rates. When interest rates rise, fixed income security prices fall. When interest rates fall, fixed income security prices rise. In general, fixed income securities with longer maturities are more sensitive to these price changes. In addition, falling interest rates may cause the DFA Commodity Strategy Portfolio's income to decline.

Credit Risk: Credit risk is the risk that the issuer of a security, or the counterparty to an agreement or contract, including a derivative instrument, such as a credit default swap, may be unable or unwilling to meet its financial obligations. A downgrade to an issuer's credit rating or a perceived change in an issuer's financial strength may affect a security's value, and thus, impact the DFA Commodity Strategy Portfolio's performance.

Call Risk: Call risk is the risk that during periods of falling interest rates, a bond issuer will call or repay a higher-yielding bond before its maturity date, forcing the DFA Commodity Strategy Portfolio to reinvest in bonds with lower interest rates than the original obligations.

Liquidity Risk: Certain portfolio holdings, such as commodity-linked derivative instruments and swap agreements, may be difficult or impossible to sell at the time and the price that the DFA Commodity Strategy Portfolio would like. The DFA Commodity Strategy Portfolio may have to lower the price, sell other holdings instead, or forego an investment opportunity. Any of these could have a negative effect on management of the DFA Commodity Strategy Portfolio or the Portfolio's performance.

Subsidiary Risk: By investing in the Subsidiary, the DFA Commodity Strategy Portfolio is indirectly exposed to the risks associated with the Subsidiary's investments. The derivatives and other investments held by the Subsidiary are generally similar to those that are permitted to be held by the DFA Commodity Strategy Portfolio and are subject to the same risks that apply to similar investments if held directly by the DFA Commodity Strategy Portfolio. These risks are described elsewhere in this Prospectus. There can be no assurance that the investment objective of the Subsidiary will be achieved.

The Subsidiary is not registered under the Investment Company Act of 1940, as amended (the "1940 Act"), and, unless otherwise noted in this Prospectus, is not subject to all of the investor protections of the 1940 Act. However, the DFA Commodity Strategy Portfolio wholly owns and controls the Subsidiary, and the Portfolio and the Subsidiary are both managed by the Advisor, making it unlikely that the Subsidiary will take action contrary to the interests of the Portfolio and its shareholders. The Board of Directors of DFA Investment Dimensions Group Inc. (the "Fund") has oversight responsibility for the investment activities of the DFA Commodity Strategy Portfolio, including its investment in the Subsidiary, and the Portfolio's role as the sole shareholder of the Subsidiary. The Subsidiary will be subject to investment restrictions and limitations and compliance policies and procedures substantially similar to those imposed on the DFA Commodity Strategy Portfolio by the 1940 Act.

Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the DFA Commodity Strategy Portfolio and/or the Subsidiary to continue to operate as it does currently and could adversely affect the Portfolio. For example, the Cayman Islands currently do not impose any income, corporate, or capital gains tax, estate duty, inheritance tax, gift tax, or withholding tax on the Subsidiary. If Cayman Islands law changes, such that the Subsidiary must pay Cayman Islands taxes, Portfolio shareholders likely would suffer decreased investment returns.

Tax Risk: As a regulated investment company, the Portfolio must derive at least 90% of its gross income for each taxable year from sources treated as qualifying income under the Internal Revenue Code of 1986, as amended (the "Code"). The Portfolio has obtained private letter rulings from the Internal Revenue Service (the "IRS") confirming that the income the Portfolio derives from a form of commodity-linked note and the Subsidiary constitutes qualifying income under the Code. As of the date of this prospectus, the IRS has reportedly suspended the issuance of further such private letter rulings, but has taken no action to revoke any such previously issued rulings. In the event the IRS were to change its position with respect to the conclusions reached in these private letter rulings, the income and gains from the Portfolio's investment in the commodity-linked notes and/or the Subsidiary might be nonqualifying income, and there is a possibility such change in position might be applied to the Portfolio retroactively, in which case the Portfolio might not qualify as a regulated investment company for one or more years. In this event, the Portfolio's Board may authorize a significant change in investment strategy or Portfolio liquidation. In lieu of potential disqualification, the Portfolio is permitted to pay a tax for certain failures to satisfy the income requirement, which, in general, are limited to those due to reasonable cause and not willful neglect for taxable years of the Portfolio with respect to which the extended due date of the return is after December 22, 2010. For more information, please see the "DIVIDENDS, DISTRIBUTIONS AND TAX MATTERS" section in the Portfolio's Statement of Additional Information.

Leveraging Risk: Certain transactions that the DFA Commodity Strategy Portfolio may enter into may give rise to a form of leverage. Such transactions may include, among others, structured notes, swap agreements, futures contracts, and loans of portfolio securities. The use of leverage may cause the DFA Commodity Strategy Portfolio to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements. Leverage may cause the DFA Commodity Strategy Portfolio to be more volatile than if the Portfolio had not been leveraged. This is because leverage tends to exaggerate the effect of any increase or decrease in the value of the Portfolio's portfolio securities.

Regulatory Risk: Governments, agencies, or other regulatory bodies may adopt or change laws or regulations that could adversely affect the issuer, the market value of the security, or the Portfolio's performance.

Valuation Risk: The lack of an active trading market may make it difficult to obtain an accurate price for a security held by the DFA Commodity Strategy Portfolio. Many commodity-linked derivative instruments are not actively traded.

Securities Lending Risk: Securities lending involves the risk that the borrower may fail to return the securities in a timely manner or at all. As a result, the DFA Commodity Strategy Portfolio may lose money and there may be a delay in recovering the loaned securities. The DFA Commodity Strategy Portfolio could also lose money if the Portfolio does not recover the securities and/or the value of the collateral falls, including the value of investments made with cash collateral. Securities lending also may have certain adverse tax consequences.

PERFORMANCE

The bar chart and table immediately following illustrate the variability of the DFA Commodity Strategy Portfolio's returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the DFA Commodity Strategy Portfolio's performance from year to year. The table illustrates how annualized one year and since inception returns, both before and after taxes, compare with those of a broad measure of market performance. The DFA Commodity Strategy Portfolio's past performance (before and after taxes) is not an indication of future results. Updated performance information for the Portfolio can be obtained by visiting www.dimensional.com.

The after-tax returns presented in the table for the DFA Commodity Strategy Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown in the table. In addition, the after-tax returns shown are not relevant to investors who hold shares of the Portfolio through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

DFA Commodity Strategy Portfolio Institutional Class Shares

Total Returns (%)

January 2011-December 2011
Highest Quarter	Lowest Quarter
5.21 (1/11-3/11)	-11.13 (7/11-9/11)

Periods ending December 31, 2011

Annualized Returns (%)

Average Annual Total Returns - DFA Commodity Strategy Portfolio	One Year	Since Inception	Inception Date
The DFA Commodity Strategy Portfolio	(12.10%)	(7.05%)	Nov. 08, 2010
The DFA Commodity Strategy Portfolio Return After Taxes on Distributions	(12.28%)	(7.23%)	Nov. 08, 2010
The DFA Commodity Strategy Portfolio Return After Taxes on Distributions and Sale of Portfolio Shares	(7.85%)	(6.08%)	Nov. 08, 2010
Dow Jones-UBS Commodity Index Total Return (reflects no deduction for fees, expenses, or taxes on sales)	(13.32%)	(8.52%)