The fund is a "fund of funds," meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund's investments generally will be allocated among the major asset classes as follow: 45% of its assets in equity securities (stock funds); 45% of its assets in fixed-income securities (bond funds); and 10% of its assets in cash equivalents (money market funds). The neutral mix of One Choice In Retirement Portfolio is expected to remain fixed over time.