Strategy. One Choice Blend+ 2060 Portfolio is a fund of funds, meaning that it seeks to achieve its objective by investing in other mutual funds advised by American Century (collectively, the underlying funds) that represent a variety of asset classes and investment styles. The underlying stock funds draw on growth, value and quantitative investment techniques and diversify investments among small, medium and large U.S. and foreign companies. The underlying bond funds invest in fixed-income securities that vary by issuer type (corporate and government), credit quality (investment-grade and high-yield or junk bonds) and geographic exposure (domestic and international). Short-term investments include underlying funds that invest in fixed-income or debt instruments and have a shorter-term weighted average duration, typically three years or less. … Show more… One Choice Blend+ 2060 Portfolio is a fund of funds, meaning that it seeks to achieve its objective by investing in other mutual funds advised by American Century (collectively, the underlying funds) that represent a variety of asset classes and investment styles. The underlying stock funds draw on growth, value and quantitative investment techniques and diversify investments among small, medium and large U.S. and foreign companies. The underlying bond funds invest in fixed-income securities that vary by issuer type (corporate and government), credit quality (investment-grade and high-yield or junk bonds) and geographic exposure (domestic and international). Short-term investments include underlying funds that invest in fixed-income or debt instruments and have a shorter-term weighted average duration, typically three years or less. The following table indicates the funds neutral mix; that is, how the funds investments generally will be allocated among the major asset classes as of the date of this prospectus. Equity Securities (Stock Funds) 95.0 % U.S. Equity 60.5 % International Equity 31.6 % Real Estate 2.9 % Fixed-Income Securities (Bond Funds) 4.8 % Short-Term Investments (Short-Term Funds) 0.2 % The target date in the fund name (2060) refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The target date does not necessarily represent the specific year you expect to need your assets. It is intended only as a general guide and assumes a retirement age of 65. The fund may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. Over time, the funds neutral mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and short-term investments. The fund will reach its most conservative allocation approximately five years after the target date, at which point its neutral mix is expected to become fixed at 40% stock funds, 51% bond funds and 9% short-term funds. The following chart shows how the neutral mix is expected to change over time according to a predetermined glide path. The portfolio managers regularly review the funds allocations to determine whether rebalancing is appropriate. In order to better balance risks in changing market environments, the portfolio managers may make modest deviations from the neutral mix in light of prevailing market conditions. We reserve the right to modify the neutral mix and underlying funds from time to time should circumstances warrant a change. Show less