Explores children's understanding of a variety of interpersonal events, focusing mainly on the question of whether, and in what way, their conceptions of these events were heterogeneous or undifferentiated. (HOD)

Appraises the respective contribution of initial competence and of imitation of modeled response in the observational learning of conservation among first grade children. (HOD)

Presents a continuation of previous research on a general development process consisting of successive levels in conceptualization. Explores how young children conceptualize the writing system. Considers both social background and preschool system of education. Concludes that teaching activities used in French nursery schools are less effective…