ROBECO BOSTON PARTNERS ALL-CAP VALUE FUND (Prospectus Summary) | ROBECO BOSTON PARTNERS ALL-CAP VALUE FUND

SUMMARY SECTION

Investment Objective

The Fund seeks to provide long-term growth of capital primarily through
investment in equity securities.

Current income is a secondary objective.

Expenses and Fees

This table describes the fees and expenses that you may pay if you buy and hold
Institutional Class shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees	ROBECO BOSTON PARTNERS ALL-CAP VALUE FUND INSTITUTIONAL
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	none
Maximum deferred sales charge (load)	none
Maximum sales charge (load) imposed on reinvested dividends	none
Redemption fee (as a percentage of amount redeemed on shares held for less than one year, if applicable)	none
Exchange fee (as a percentage of amount exchanged on shares held for less than one year, if applicable)	none

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

Annual Fund Operating Expenses		ROBECO BOSTON PARTNERS ALL-CAP VALUE FUND INSTITUTIONAL
Management fees		0.80%
Distribution (12b-1) fees		none
Other expenses		0.23%
Total annual Fund operating expenses		1.03%
Less Fee Waivers and Expense Reimbursements	[1]	(0.33%)
Net expenses		0.70%

Example

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 that you sell all
of your shares at the end of the period. The Example also assumes that your
investment has a 5% return each year and that the operating expenses of the Fund
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

Expense Example (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
ROBECO BOSTON PARTNERS ALL-CAP VALUE FUND INSTITUTIONAL	72	295	536	1,229

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells
securities (or "turns over" its portfolio). A higher portfolio turnover rate
may indicate higher transaction costs and may result in higher taxes when
Fund shares are held in a taxable account. These costs, which are not
reflected in Total Annual Fund Operating Expenses or in the Example, affect
the Fund's performance. During the fiscal year ended August 31, 2012, the
portfolio turnover rate for the Fund was 33%.

Summary of Principal Investment Strategies

The Fund pursues its objective by investing, under normal circumstances, at
least 80% of its net assets (including borrowings for investment purposes)
in a diversified portfolio consisting primarily of equity securities, such
as common stocks of issuers across the capitalization spectrum and identified
by Robeco as having value characteristics.

Robeco examines various factors in determining the value characteristics of
such issuers including price to book value ratios and price to earnings ratios.
These value characteristics are examined in the context of the issuer's
operating and financial fundamentals, such as return on equity and earnings
growth and cash flow. Robeco selects securities for the Fund based on a
continuous study of trends in industries and companies, earnings power and growth
and other investment criteria.

Robeco will sell a stock when it no longer meets one or more investment criteria,
either through obtaining target value or due to an adverse change in fundamentals
or business momentum. Each holding has a target valuation established at purchase,
which Robeco constantly monitors and adjusts as appropriate.

The Fund may also invest up to 20% of its total assets in non U.S. dollar-denominated
securities.

The Fund may invest up to 15% of its net assets in illiquid securities, including
securities that are illiquid by virtue of the absence of a readily available market
or legal or contractual restrictions on resale.

The Fund may participate as a purchaser in initial public offerings of securities
("IPO"). An IPO is a company's first offering of stock to the public.

The Fund may invest up to 10% of its net assets in securities that can be converted
into common stock, such as certain debt securities and preferred stock.

The Fund may hedge overall portfolio exposure up to 40% of its net assets through
the purchase and sale of index and individual put and call options.

In general, the Fund's investments are broadly diversified over a number of
industries and, as a matter of policy, the Fund is limited to investing less
than 25% of its total assets in any one industry.

While Robeco intends to fully invest the Fund's assets at all times in accordance
with the above-mentioned policies, the Fund reserves the right to hold up to 100%
of its assets, as a temporary defensive measure, in cash and eligible U.S.
dollar-denominated money market instruments. Robeco will determine when market
conditions warrant temporary defensive measures.

Summary of Principal Risks

• Management Risk. The Fund is subject to the risk of poor stock selection. In
other words, the individual stocks in the Fund may not perform as well as
expected, and/or the Fund's portfolio management practices do not work to
achieve their desired result.

• Market Risk. The net asset value ("NAV") of the Fund will change with changes
in the market value of its portfolio positions. Investors may lose money.
Although the Fund will invest in stocks Robeco believes to be undervalued, there
is no guarantee that the prices of these stocks will not move even lower.

• Foreign Securities Risk. International investing is subject to special risks,
including, but not limited to, currency exchange rate volatility, political,
social or economic instability, and differences in taxation, auditing and other
financial practices.
  
• Small/Mid Cap Companies Risk. Investing in securities of companies with micro,
small or mid-sized capitalizations tends to be riskier than investing in
securities of companies with large capitalizations.

Securities of companies with micro, small and mid-sized capitalizations tend to
be more volatile than those of large cap companies and, on occasion, may fluctuate
in the opposite direction of large cap company securities or the broader stock
market averages.

The small capitalization equity securities in which the Fund invests may be
traded only in the over-the-counter market or on a regional securities exchange,
may be listed only in the quotation service commonly known as the "pink sheets,"
and may not be traded every day or in the volume typical of trading on a national
securities exchange. These securities may also be subject to wide fluctuations in
market value. The trading market for any given small capitalization equity security
may be sufficiently small as to make it difficult for the Fund to dispose of a
substantial block of such securities. The sale by the Fund of portfolio securities
to meet redemptions may require the Fund to sell its small capitalization securities
at a discount from market prices or during periods when, in Robeco's judgment, such
sale is not desirable. Moreover, the lack of an efficient market for these securities
may make them difficult to value.

• Convertible Securities Risk. Securities that can be converted into common
stock, such as certain securities and preferred stock, are subject to the usual
risks associated with fixed income investments, such as interest rate risk and
credit risk. In addition, because they react to changes in the value of the
equity securities into which they will convert, convertible securities are also
subject to the risks associated with equity securities.

• Portfolio Turnover Risk. If the Fund frequently trades its portfolio securities,
the Fund will incur higher brokerage commissions and transaction costs, which could
lower the Fund's performance. In addition to lower performance, high portfolio
turnover could result in taxable capital gains. The annual portfolio turnover rate
for the Fund is not expected to exceed 125%; however, it may be higher if Robeco
believes it will improve the Fund's performance.

• Options Risk. An option is a type of derivative instrument that gives the
holder the right (but not the obligation) to buy (a "call") or sell (a "put") an
asset in the near future at an agreed upon price prior to the expiration date of
the option. The Fund may "cover" a call option by owning the security underlying
the option or through other means. The value of options can be highly volatile,
and their use can result in loss if Robeco is incorrect in its expectation of
price fluctuations.

• Illiquid Securities Risk. Investing in illiquid securities is subject to
certain risks, such as limitations on resale and uncertainty in determining
valuation. Limitations on resale may adversely affect the marketability of
portfolio securities and the Fund might be unable to dispose of restricted or
other illiquid securities promptly or at reasonable prices and might thereby
experience difficulty satisfying redemptions within seven days. The Fund might,
in order to dispose of restricted securities, have to register securities
resulting in additional expense and delay. Adverse market conditions could
impede such a public offering of such securities.

• IPO Risk. IPO risk is the risk that the market value of IPO shares will
fluctuate considerably due to certain factors, such as the absence of a prior
public market, unseasoned trading, the small number of shares available for
trading and limited information about the issuer. The purchase of IPO shares
may involve high transaction costs. IPO shares are subject to market risk and
liquidity risk. When the Fund's asset base is small, a significant portion of
the Fund's performance could be attributable to investments in IPOs, because
such investments would have a magnified impact on the Fund. As the Fund's assets
grow, the effect of the Fund's investments in IPOs on the Fund's performance
probably will decline, which could reduce the Fund's performance. Because of the
price volatility of IPO shares, the Fund may choose to hold IPO shares for a
very short period of time. This may increase the turnover of the Fund's portfolio
and may lead to increased expenses to the Fund, such as commissions and
transaction costs. In addition, Robeco cannot guarantee continued access to IPOs.

Performance Information

The chart below illustrates the long-term performance of the Robeco Boston
Partners All-Cap Value Fund's Institutional Class. The information shows you
how the Fund's performance has varied year by year and provides some indication
of the risks of investing in the Fund. The chart assumes reinvestment of
dividends and distributions. As with all such investments, past performance
(before and after taxes) is not an indication of future results. Performance
reflects fee waivers in effect. If fee waivers were not in place, the Fund's
performance would be reduced. Updated performance information is available at
www.robecoinvest.com or 1-888-261-4073.

Total Returns for the Calendar Years Ended December 31

Best and Worst Quarterly Performance (for the periods reflected in
the chart above):

Best Quarter: 18.60% (quarter ended June 30, 2009)
Worst Quarter: (17.49)% (quarter ended September 30, 2011)
Year-to-date total return for the nine months ended September 30, 2012: 14.21%

Average Annual Total Returns

The table below compares the average annual total returns for the Fund's
Institutional Class both before and after taxes for the past calendar year, past
five calendar years and since inception to the average annual total returns of a
broad-based securities market index for the same periods.

Average Annual Total Returns for the Periods Ended December 31, 2011

Average Annual Total Returns ROBECO BOSTON PARTNERS ALL-CAP VALUE FUND	Label		1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL	Return Before Taxes		(1.38%)	1.57%	8.27%	Jul. 01, 2002
INSTITUTIONAL After Taxes on Distributions	Return After Taxes on Distributions	[1]	(2.73%)	0.53%	7.23%	Jul. 01, 2002
INSTITUTIONAL After Taxes on Distributions and Sales	Return After Taxes on Distributions and Sale of Fund Shares		0.11%	0.92%	6.90%	Jul. 01, 2002
Russell 3000® Value Index	Russell 3000® Value Index (reflects no deduction for fees, expenses or taxes)		(0.10%)	(2.58%)	4.73%	Jul. 01, 2002

[1] The Fund's investment adviser, Robeco Investment Management, Inc. ("Robeco"), has contractually agreed to waive all or a portion of its advisory fee and/or reimburse expenses in an aggregate amount equal to the amount by which the Total Annual Fund Operating Expenses (excluding certain items discussed below) for the Fund's Institutional Class shares exceeds 0.70% of the average daily net assets attributable to the Fund's Institutional Class shares. In determining Robeco's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account and could cause net Total Annual Fund Operating Expenses to exceed 0.70%: acquired fund fees and expenses, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until December 31, 2013 and may not be terminated without the approval of the Board of Directors of The RBB Fund, Inc. Robeco may not recoup any of its waived investment advisory fees.

[1] After-tax returns 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. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.