The fund normally invests at least 80% of assets in common stocks of companies with medium market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell Midcap® Index or the S&P MidCap 400® Index). It potentially invests in companies with smaller or larger market capitalizations. The fund invests in domestic and foreign issuers. It invests in either growth stocks or value stocks or both.