Abstract
InExplaining Science: A Cognitive Approach, Ronald Giere (1988), proposes what he calls a cognitive theory of science (p. 2). Giere intends his view to be a broadly scientific account employing the resources of the cognitive sciences (Giere, 1988, p. 2). This paper argues that Giere does not secure a firm foundation for a cognitive theory of science because he leaves the door wide open for social constructivist interpretations of his views. In order to avoid social constructivism, Giere needs to adopt or develop an objective (i.e. non-conventionalist) concept of similarity.