A concept-by-concept approach to Jean Piaget's ideas and findings about the intellectual growth of children is presented in simplified form for the lay reader. It first reviews the theoretical rationale behind Piaget's work and sets forth his basic principles of development. Then comes an overview of developmental stages of intellectual growth from infancy to adolescence. Next, there follows a more detailed presentation of Piaget's work in many different areas, including his studies of time, speed and perception. Piaget's views on education and teacher training sum up the impact of his thinking on child psychology today. The chapters include: Piaget: a Profile, Adaptation: the Basis of Behavior, The Beginnings of Intelligence, An Overview of Development, Conservation, The Preoperational Child, Concrete Operations, Formal Operations, Morality, Emotional Development, Play and Imitation, Representation, Numbers, The Geometry of Space, Perception and Learning, Time, Movement and Speed, and Education. Appendices include Piaget's works in chronological order according to French publication dates. (JG)