This study investigates the manner in which consumers make investment decisions for mutual funds. Investors report that they consider many nonperformance related variables. When investors are grouped by similarity of investment decision process, a single small group appears to be highly knowledgeable about its investments. However, most investors appear to be naive, having little knowledge of the investment strategies or financial details of their investments. Implications for mutual fund companies are discussed. © 1996 Kluwer Academic Publishers.