Contents: M. Chandler, Foreword. E.K. Scholnick, Piaget's Legacy: Heirs to the House That Jean Built. Part I:How Should We Represent the Workings and Contents of the Mind?R. Case, Conceptual Development in the Child and in the Field: A Personal View of the Piagetian Legacy. A.N. Meltzoff, M.K. Moore, A New Foundation for Cognitive Development in Infancy: The Birth of the Representational Infant. S.A. Gelman, G. Diesendruck, A Reconsideration of Concepts: On the Compatibility of Psychological Essentialism and Context Sensitivity. F.C. Keil, K.L. Lockhart, Explanatory Understanding in Conceptual Development. D. Klahr, The Conceptual Habitat: In What Kind of System Can Concepts Develop? Part II:How Does the Child Construct a Mental Model During the Course of Development? What Is the Developmental Origin of This Model?R. Garcia, A Systemic Interpretation of Piaget's Theory of Knowledge. S. Oyama, Locating Development: Locating Developmental Systems. P.H. Miller, T.R. Coyle, Developmental Change: Lessons From Microgenesis. Part III:What Accounts for the Novelties That Are the Products and Producers of Developmental Change?J. Voneche, The Origin of Piaget's Ideas About Genesis and Development. G.B. Saxe, Sources of Concepts: A Cultural-Developmental Perspective. K. Nelson, Levels and Modes of Representation: Issues for the Theory of Conceptual Change and Development. S. Carey, Sources of Conceptual Change.