Anderson (1990) recently proposed a model of categorization known as the rational model. The purpose of the present note is to consider formal relations between the rational model and Medin and Schaffer's (1978) well-known context model of categorization. The main point is to prove that a slightly modified version of Anderson's (1990) rational model generalizes the context model. Relations between the rational model and the fuzzy loqical model of perception (Massaro, 1987; Massaro & Friedman, 1990; Oden & Massaro, 1978) are also discussed.