Strategy. The Fund has a flexible investment strategy and will invest in a variety of securities and other investments and use a variety of investment techniques in pursuing its investment objective. The Fund seeks investment in, but not limited to, foreign and domestic securities and other instruments, mortgage-backed securities (MBS) and asset-backed securities, commercial mortgage-backed securities, collateralized loan obligations, collateralized mortgage obligations, stripped securities, preferred and convertible securities, bank instruments, high yield corporate debt, loans, other fixed-income securities, sovereign nations including emerging markets and so-called frontier markets (such as currencies, interest rates and debt instruments issued or guaranteed by sovereign entities (including U.S. Treasuries)), inflation and credit-linked debt securities, municipal investments, and commodities-related investments. The Fund may invest up to 20% … Show more… The Fund has a flexible investment strategy and will invest in a variety of securities and other investments and use a variety of investment techniques in pursuing its investment objective. The Fund seeks investment in, but not limited to, foreign and domestic securities and other instruments, mortgage-backed securities (MBS) and asset-backed securities, commercial mortgage-backed securities, collateralized loan obligations, collateralized mortgage obligations, stripped securities, preferred and convertible securities, bank instruments, high yield corporate debt, loans, other fixed-income securities, sovereign nations including emerging markets and so-called frontier markets (such as currencies, interest rates and debt instruments issued or guaranteed by sovereign entities (including U.S. Treasuries)), inflation and credit-linked debt securities, municipal investments, and commodities-related investments. The Fund may invest up to 20% of its net assets in equity securities and may invest up to 10% of its net assets in municipal securities. The Fund may have significant investment in a geographic region or country. The Fund may invest in investments of any maturity and without regard to a specific duration target or limit. The Fund expects to achieve certain investment exposures through purchasing and selling derivative transactions, including (but not limited to) forward foreign currency exchange contracts; futures on securities, indices, currencies, commodities, swaps and other investments; options; and interest rate swaps, cross-currency swaps, total return swaps and credit default swaps, which may create economic leverage in the Fund. The Fund may engage in derivative transactions to seek to enhance total return; to hedge against fluctuations in securities prices, interest rates or currency exchange rates; to change the effective duration of its portfolio; to manage certain investment risks; and/or as a substitute for the purchase or sale of securities, currencies or commodities. The Fund may use derivatives to implement various systematic investment processes, including taking long and short interest rate positions across various emerging markets to seek to enhance total return. The Funds use of derivatives may be extensive and, except as required by applicable regulation, there is no stated limit on their use. The Fund seeks to achieve its investment objective of total return by investing in registered investment companies managed by Eaton Vance and its affiliates that invest in different asset classes (the Portfolios). References to the Funds investments include both investments held directly by the Fund and indirectly through the Portfolios in which the Fund invests. Total return is defined as income plus capital appreciation. In making allocation decisions, the Funds portfolio managers take market and other factors into consideration. The Fund will maintain an average credit rating of at least investment grade (BBB by S&P Global Ratings (S&P) or Fitch Ratings (Fitch), or Baa by Moodys Investors Service (Moodys)). The Funds average credit rating will be the weighted-average of (i) the average credit ratings of the Portfolios in which it invests and (ii) the securities it holds directly. While the Funds average credit rating will be investment grade, the Fund may invest in securities that are rated below investment grade (rated below BBB by either S&P or Fitch, or below Baa by Moodys) or in unrated securities considered to be of comparable quality by the investment adviser (often referred to as junk instruments). The Fund may engage in repurchase agreements, reverse repurchase agreements, forward commitments and short sales. The Fund may invest in Portfolios that acquire investments with borrowings. The Fund may enter into forward commitments to buy or sell agency ?MBS (to-be-announced transactions, or TBAs). In managing the Fund, the investment adviser adjusts investments based on its ?macroeconomic views and analysis in an effort to take advantage of differences in investment sectors, such as U.S. government, investment grade and below investment grade credit markets, and foreign sectors (primarily focused on sovereign debt, currencies and interest rates). The investment adviser considers the relative risk/return characteristics of prospective investments (whether securities, currencies, derivatives, commodities or other instruments) in determining the most efficient means for achieving desired exposures. When deemed by the investment adviser to be relevant to its evaluation of creditworthiness and when applicable information is available, the investment adviser considers environmental, social and/or governance issues (referred to as ESG) which may impact the prospects of an issuer (or obligor) or financial performance of an obligation. When considered, one or more ESG issues are taken into account alongside other factors in the investment decision-making process and are not the sole determinant of whether an investment can be made or will remain in the Funds portfolio. These considerations may be taken into account alongside other fundamental research in the investment selection process. The Fund may gain exposure to commodities by investing in certain registered investment companies managed by Eaton Vance and its affiliates that invest in commodities and commodities-related investments. Each such fund may invest up to 25% of its total assets in a wholly-owned subsidiary organized under the laws of the Cayman Islands, which invests primarily in commodities-related investments, as well as securities and other instruments in which such fund is permitted to invest (the Subsidiary). Show less