A single mutual fund which tries to accomplish the goals of asset allocation all by itself. Such a fund invests in a variety of securities in different asset classes. The purpose is to provide investors with truly diversified holdings and consistent returns, while sparing the investor the trouble of having to accomplish asset allocation by purchasing a large number of different funds. Some asset allocation funds have a specific breakdown of asset classes that they try to maintain over time, while others vary the composition as opportunities and circumstances change.