TCW Core Fixed Income Fund

TCW Core Fixed Income Fund

Investment Objective

The Fund's investment objective is to seek to maximize current income and achieve above average total return consistent with prudent investment management over a full market cycle.

Fees and Expenses of the Fund

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

Shareholder Fees (Fees paid directly from your investment)

Shareholder Fees - TCW Core Fixed Income Fund (USD $)	Class I	Class N
Shareholder Fees (Fees paid directly from your investment)	none	none

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

Annual Fund Operating Expenses - TCW Core Fixed Income Fund		Class I	Class N
Management fees		0.40%	0.40%
Distribution and/or service (12b-1) fees		none	0.25%
Other expenses		0.15%	0.20%
Total annual fund operating expenses		0.55%	0.85%
Fee Waiver [and/or Expense Reimbursement]	[1]	0.11%	0.07%
Net Expenses	[1]	0.44%	0.78%

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.

This example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all 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 remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example - TCW Core Fixed Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class I	45	165	296	679
Class N	80	264	464	1,042

Portfolio Turnover

The Fund pays transaction costs 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 annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 280.49% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests (except when maintaining a temporary defensive position) at least 80% of the value of its net assets in debt securities. If the Fund changes this investment policy, it will notify shareholders in writing at least 60 days in advance of the change. These debt securities include but are not limited to securities issued or guaranteed by the United States Government, its agencies, instrumentalities or sponsored corporations; corporate obligations (including convertible securities); mortgage-backed securities; asset backed securities; U.S. dollar denominated foreign securities (corporate and government); and other securities bearing fixed or variable interest rates of any maturity.

The Fund may invest up to 5% of its net assets in high yield/below investment grade bonds, commonly known as "junk" bonds. The Fund may also invest a portion of its assets in bank loans of companies in the high yield universe. High yield portfolio holdings are diversified by industry and issuer in an attempt to reduce the impact of negative events for an industry or issuer.

The Fund may invest, without limitation, in derivative instruments such as options, futures and swap agreements. The Fund may invest in securities that are commonly referred to as mortgage derivatives, including inverse floaters, and interest only (IO), principal-only (PO), inverse IOs and tiered index bonds. The Fund may also purchase or sell securities on a when-issued, delayed delivery or forward commitment basis.

In managing the Fund's investments, under normal market conditions, the portfolio managers use a controlled risk approach. The techniques of this approach attempt to control the principal risk components of the fixed income markets and include consideration of:

• security selection within a given sector

• relative performance of the various market sectors

• the shape of the yield curve

• fluctuations in the overall level of interest rates

The portfolio managers also utilize active asset allocation in managing the Fund's investments and monitor the duration of the Fund's portfolio securities to seek to mitigate the Fund's exposure to interest rate risk.

Portfolio securities may be sold when the Fund's portfolio managers determine to take advantage of a better investment opportunity because they believe the portfolio securities no longer represent relatively attractive investment opportunities, there is perceived deterioration in the credit fundamentals of the issuer or the individual security has reached its sell target.

Principal Risks

Since the Fund holds securities with fluctuating market prices, the value of the Fund's shares will vary as its portfolio securities increase or decrease in value. Therefore, the value of your investment in the Fund could go down as well as up. You can lose money by investing in the Fund.

The principal risks affecting the Fund that can cause a decline in value are:

• interest rate risk: the risk that debt securities will decline in value because of changes in interest rates or a decline in interest rates will lower the Fund's yield.

• credit risk: the risk that an issuer will default in the payment of principal and/or interest on a security.

• price volatility risk: the risk that the value of the Fund's investment portfolio will change as the prices of its investments go up or down.

• junk bond risk: the risk that these bonds have a higher degree of default risk and may be less liquid and subject to greater price volatility than investment grade bonds.

• prepayment risk of mortgage-backed securities: the risk that in times of declining interest rates, the Fund's higher yielding securities will be prepaid and the Fund will have to replace them with securities having a lower yield.

• extension risk of mortgage-backed securities: the risk that in times of rising interest rates mortgage prepayments will slow causing portfolio securities considered short or intermediate term to be long-term securities which fluctuate more widely in response to changes in interest rates than shorter term securities.

• derivatives risk: the risk of investing in derivative instruments, including liquidity, interest rate, market and management risks, mispricing or improper value. Changes in the value of a derivative may not correlate perfectly with the underlying asset, reference rate or index and the Fund could lose more than the principal amount invested.

• leveraging risk: the risk that leverage created from borrowing or certain types of transactions or instruments, including derivatives, may impair the Fund's liquidity, cause it to liquidate positions at an unfavorable time, increase volatility or otherwise not achieve its intended result.

• counterparty risk: the risk that the other party to a contract, such as a swap agreement, will not fulfill its contractual obligations.

• issuer risk: the risk that the value of a security may decline for reasons directly related to the issuer such as management performance, financial leverage and reduced demand for the issuer's goods or services.

• liquidity risk: the risk that there may be no willing buyer of the Fund's portfolio securities and the Fund may have to sell those securities at a lower price or may not be able to sell the securities at all, each of which would have a negative effect on performance.

• market risk: the risk that returns from the securities in which the Fund invests will underperform returns from the general securities markets or other types of securities.

• securities selection risk: the risk that the securities held by the Fund will underperform other funds investing in the same asset class or benchmarks that are representative of the asset class because of the portfolio managers' choice of securities.

• portfolio management risk: the risk that an investment strategy may fail to produce the intended results.

• globalization risk: the risk that the growing inter-relationship of all global economies and financial markets has increased the effect of conditions in one country or region on issuers of securities in a different country or region.

• foreign investing risk: the risk that Fund share prices will fluctuate with market conditions, currencies, and the economic and political climates where investments are made.

• asset-backed securities investment risk: the risk that the impairment of the value of the collateral underlying a security in which the Fund invests such as non-payment of loans, will result in a reduction in the value of the security.

Please see "Principal Risks and Risk Definitions" for a more detailed description of the risks of investing in the Fund.

Your investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency entity or person.

Investment Results

The bar chart below shows how the Fund's investment results have varied from year to year and the table below shows how the Fund's average annual returns for various periods compare with a broad measure of market performance. This information provides some indication of the risks of investing in the Fund by showing the changes in the Fund's performance from year to year. The bar chart shows performance of the Fund's Class I shares. Class N performance would be lower than Class I performance because of the lower expenses paid by Class I shares. Past results (before and after taxes) are not predictive of future results. Updated information on the Fund's investment results can be obtained by visiting tcwfunds.com.

Calendar Year Total Returns

For Class I Shares

Highest/Lowest quarterly results during this period were:

Highest	7.35%	(quarter ended 9/30/2009)
Lowest	-2.34%	(quarter ended 6/30/2004)

Average Annual Total Returns

(For the period ended December 31, 2011)

Average Annual Total Returns - TCW Core Fixed Income Fund		1 Year	5 Years	10 Years
Class I		6.98%	8.73%	7.14%
Class I - After taxes on distributions		5.50%	6.54%	5.13%
Class I - After taxes on distributions and sale of fund shares		4.66%	6.22%	4.95%
Class N		6.62%	8.39%	6.88%
Barclays Capital U.S. Aggregate Bond Index	[1]	7.84%	6.50%	5.78%

After-tax returns are calculated using the highest individual federal income tax rates in effect each year and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your individual tax situation and likely will differ from the results shown above, and after-tax returns shown are not relevant if you hold your Fund shares through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account (IRA).

[1] The Fund's investment advisor has agreed to waive fees and/or reimburse expenses to limit the Fund's total annual operating expenses (excluding interest and acquired fund fees and expenses, if any) to 0.44% with respect to Class I shares and 0.78% with respect to Class N shares of average daily net assets. This contractual fee waiver/expense reimbursement is for the period March 1, 2012 through February 28, 2013. At the conclusion of this period, the Fund's investment advisor, in its sole discretion, may extend, terminate or otherwise modify the contractual fee waiver/expense reimbursement.

[1] The Barclays Capital U.S. Aggregate Bond Index is a market capitalization-weighted index of investment grade fixed-rate debt issues, including government, corporate, asset-backed and mortgage-backed securities with maturities of at least one year.