Qu'est-ce que l'intelligence? / Robert H. Wozniak -- The role of abstract rationality in Vygotsky's image of mind / James V. Wertsch -- Structure and development : reflections by Vygotsky / René van der Veer -- Mechanisms of internalisation and externalisation of knowledge in Piaget's and Vygotsky's theories / Eduardo Marti -- Units of analysis in psychology and their interpretation / Jean-Paul Bronckart -- The social construction of rational understanding / Leslie Smith -- Construction and interpretation / Jens Brockmeier.

Social interaction and individual understanding in a community of learners / Ann L. Brown, Kathleen E. Metz, & Joseph C. Campione -- Relationships between the clinical method and the zone of proximal development in a constructivist approach to language acquisition / Ioanna Berthoud-Papandropoulou & Helga Kilcher -- Intentionality, communication, and language / Ignasi Vila -- Some impressions of a visit to Soviet psychologists / Jean Piaget.