Strategy. To pursue its goal, the fund normally invests principally in bonds, including government securities, corporate bonds issued by U.S. and non-U.S. corporations, mortgage-backed securities, and asset-backed securities. In constructing the fund's portfolio, the fund's sub-adviser, Insight North America LLC, relies primarily on proprietary, internally-generated credit research. This credit research focuses on both industry/sector analysis and detailed individual security selection. The sub-adviser seeks to identify investment opportunities for the fund based on its evaluation of the relative value of sectors and securities and the credit risk of individual issuers. The sub-adviser uses fundamental credit analysis to estimate the relative value and attractiveness of various sectors and securities and to exploit pricing inefficiencies in the bond market. The sub-adviser analyzes individual issuer … Show more… To pursue its goal, the fund normally invests principally in bonds, including government securities, corporate bonds issued by U.S. and non-U.S. corporations, mortgage-backed securities, and asset-backed securities. In constructing the fund's portfolio, the fund's sub-adviser, Insight North America LLC, relies primarily on proprietary, internally-generated credit research. This credit research focuses on both industry/sector analysis and detailed individual security selection. The sub-adviser seeks to identify investment opportunities for the fund based on its evaluation of the relative value of sectors and securities and the credit risk of individual issuers. The sub-adviser uses fundamental credit analysis to estimate the relative value and attractiveness of various sectors and securities and to exploit pricing inefficiencies in the bond market. The sub-adviser analyzes individual issuer credit risk based on factors such as management depth and experience, competitive advantage, market and product position and overall financial strength. The sub-adviser may supplement its internal research with external, third-party credit research and related credit tools. The fund normally invests primarily in bonds rated, at the time of purchase, investment grade (i.e., Baa3/BBB- or higher) or the unrated equivalent as determined by the fund's sub-adviser. The fund, however, may invest up to 25% of its net assets in bonds rated, at the time of purchase, below investment grade ("high yield" or "junk" bonds) or the unrated equivalent as determined by the fund's sub-adviser. Typically, the fund's portfolio can be expected to have an average effective duration ranging between three and eight years. The fund's sub-adviser may lengthen or shorten the average effective duration outside this range depending on its evaluation of market conditions. Duration is an indication of an investment's "interest rate risk," or how sensitive a bond or the fund's portfolio may be to changes in interest rates. Generally, the longer a bond's duration, the more likely it is to react to interest rate fluctuations and the greater its long-term risk/return potential. The fund may sell securities when the sub-adviser anticipates market declines or credit downgrades. In addition, the fund may sell securities when the sub-adviser identifies new investment opportunities. As of the date of this Prospectus, the fund expects to invest a significant portion of its assets in securities of companies in the financials and industrials sectors. The fund may, but is not required to, use derivative instruments as a substitute for investing directly in an underlying asset, to increase returns, to manage interest rate risk, to manage the effective duration or maturity of the fund's portfolio, or as part of a hedging strategy. The derivative instruments in which the fund may invest typically include options, futures and options on futures (including those relating to securities, indices and interest rates), and swaps (including total return, interest rate and credit default swaps). Show less