Drawn from a conference held in 1996 to celebrate the centenary of the births of Piaget and Vygotsky, this collection of papers brings together a wide range of talent to discuss the future implications and the seminal nature of the work by the two most important figures in developmental psychology and education. These original contributions cover educational intervention and teaching, social collaboration and learning, cognitive skills and domains, the measurement of development and the development of modal understanding. Comprehensive in scope, it will be useful both to scholars and practitioner-researchers.