Abstract:Theories of children's developing understanding of mind tend to emphasize either individualistic processes of theory formation, maturation, or introspection, or the process of enculturation. However, such theories must be able to account for the accumulating evidence of the role of social interaction in the development of social understanding. We propose an alternative account, according to which the development of children's social understanding occurs within triadic interaction involving the child's experience of the world as well as communicative interaction with others about their experience and beliefs (Chapman 1991;. It is through such triadic interaction that children gradually construct knowledge of the world as well as knowledge of other people. We contend that the extent and nature of the social interaction children experience will influence the development of children's social understanding. Increased opportunity to engage in cooperative social interaction and exposure to talk about mental states should facilitate the development of social understanding. We review evidence suggesting that children's understanding of mind develops gradually in the context of social interaction. Therefore, we need a theory of development in this area that accords a fundamental role to social interaction, yet does not assume that children simply adopt socially available knowledge but rather that children construct an understanding of mind within social interaction.Keywords: language; Piaget; social interaction; theories of mind; Vygotsky; Wittgenstein et al. 1998;Symons & Clark 2000), mothers' education (Cutting & Dunn 1999), and socioeconomic circumstances (Holmes et al. 1996).Furthermore, a number of studies have found correlations between language and social understanding (e.g., Cutting & Dunn 1999; de Villers 2000; Happé 1995;Jenkins & Astington 1996). In longitudinal studies, forms of family talk about mental states have been found to be related to later success on false belief tests (e.g., Brown et al. 1996;Dunn et al. 1991a;Ruffman et al. 2002). In addition, mothers who think of their children in mentalistic terms ("mindmindedness"), and therefore, presumably talk to their children about the psychological world, have children who are more advanced in understanding beliefs than are other children (Meins & Fernyhough 1999;Meins et al. 1998). Similar correlations between family interaction and the development of children's understanding of emotions have also been reported (e.g., Dunn et al. 1991b;Hooven et al. 1995;Kuebli et al. 1995;Steele et al. 1999). In a longitudinal study, Astington and Jenkins (1999) found that earlier language abilities predict later false belief performance but earlier false belief competence does not predict later language abilities, supporting the conclusion that language is important in social cognitive development.Another source of evidence that social interaction is important for the development of a mentalistic understanding comes from research with deaf children. A number o...