Two studies are reported which examine the contribution of linguistic factors to attribute inferences and semantic similarity judgements. For this purpose a new method is developed which allows us to examine the contribution of language as a symbolically shared system. The two studies show that a substantial amount of the variance in both attribute inferences and semantic similarity judgements is mediated by socially shared linguistic conventions. The implications of these findings and the methodology for social cognition, and some models of personality and affect are discussed.The relationship between language and social cognition occupies a central position in any analysis concerning our abilities to process, store and retrieve information about behaviour and persons. By and large, however, the role of language has not attracted any direct theoretical and research interest in the examination of social cognition, except as a vehicle for communication (cf. Clark, 1985, Kraut andHiggins, 1984). There are isolated and notable exceptions examining the relationship between social cognition and language (e.g., Abelson and Kanouse, 1972;Brown and Fish, 1983; Fiedler and Semin, 1988;Garvey et al., 1976;McGuire, McGuire and Cheever, 1986; Semin and Fiedler, 1988;Semin and Greenslade, 1985).The two studies reported here investigate the relationship between language and social cognition by a new method that assesses the contribution of linguistic factors in *The research reported here was supported through an ESRC personal grant G 00 24 2033 (Social psychology of Language and Social Cognition). Thanks are due to Barbara Krahi? and an anonymous reviewer for their kind and helpful comments on an earlier version of this paper and to David Hitchin who generously gave his time to develop the programmes necessary for computing the linguistic index and providing statistical advice.