Piaget's Sociological Studies is largely taken up with questions of sociology, epistemology, moral, political and legal theory. Roughly, these are by-passed in Harré's (2000, this journal) interpretation of Piaget's social account. Our critique is in two parts. In the first part, we explain the basis of our disagreement with Harré's interpretation of six specific issues. These are Piaget's model of social exchange, sociology, concept of egocentrism, response to Wallon, psycho-social parallelism, distinction between the concrete and the abstract. In the second part, we challenge two central theses invoked in Harré's review, namely (A) all psychological activity is a joint activity, and (B) any society is based on irreducible differences in psychological activity. We have tried to set the record straight as far as Piaget's social account is concerned. Harré's review shows a general lack of acquaintance with Piaget's account and our aim has been to compensate for this.