Book excerpt: This collection of original contributions by leading researchers celebrates the 1996 centenary of the births of the two most seminal figures in education and developmental psychology - Jean Piaget and Lev Vygotsky. Research in their footsteps continues worldwide and is growing. What are the implications for the future for this extensive programme? Which of the large body of findings has proved most important to current research? Based around five themes, 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.