The investment seeks to maximize total return, consistent with preservation of capital and prudent investment management. The portfolio invests at least 80% of total assets, which include borrowings, in a diversified portfolio of fixed-income instruments of varying maturities. The average portfolio duration varies within two years (plus or minus) of the duration of the Barclays Capital U.S. Aggregate Bond index. The portfolio may invest up to 30% of assets in non-U.S. dollar-denominated securities and may invest without limit in U.S. dollar-denominated securities of foreign issuers.