This volume shares significant contemporary "Francophone" contributions to developmental psychology outside geographic and intellectual borders of French-speaking countries. Except for the spread of Piagetian theory after World War II into Anglophone psychology, these new publications have not become so well known worldwide as progress in Francophone developmental psychology warrants. However, the work of a new generation of developmental theorists and experimentalists continues to shape important and original lines of thinking and research in France, Canada, and in other French-speaking countries. This work also contributes uniquely to issues such as sensori-motor development, perception, language acquisition, social interaction, and the growth and induction of cognitive mechanisms. Scientific concepts are not only embedded in a paradigm, but also in a culture and a language. Instead of writing about Francophone developmental psychology from "outside," this volume brings together original English-language contributions written by researchers working in different Francophone countries. Chapters summarize and interpret research on a given topic, making explicit the context of philosophical and theoretical traditions in which the empirical advances are embedded. Original essays are accompanied by editorial commentaries from eminent scientists working on the same topics in other parts of the world -- topics that are closely related to Francophone streams of thought and themes of study. Together, these essays fully and faithfully represent modern scientific perspectives toward understanding many facets of mental growth and development of the young child.