The new edition of this modern classic examines the influence of Lev Vygotsky on contemporary psychology. The author has developed a unique performance-based methodology of development and learning that draws upon a fresh, often unconventional reading of Vygotsky. This book shows this methodology at work in psychotherapy, classrooms and the workplace, highlighting the many ways Vygotsky's cultural theory of human development has led to a rethinking of psychology's fundamental conceptions. It will provide essential reading for a wide audience of students and practitioners in psychology, psychotherapy, social sciences and education.