PART I: MEMORY DEVELOPMENT 1. Skills, Plans, and Self-Regulation 2. Intellectual Development from Birth to Adulthood: A Neo-Piagetian Interpretation 3. Knowledge Structures and Memory Development 4. Comments PART II: PROBLEM SOLVING 5. The Origins of Scientific Reasoning 6. How Do Children Solve Class-Inclusion Problems? 7. Goal Formation, Planning, and Learning by Pre-School Problem Solvers or: “My Socks are in the Dryer” 8. Counting in the Preschooler: What Does and Does Not Develop 9. A Discussion of the Chapters by Siegler, Trabasso, Klahr, and Gelman PART III: REPRESENTATIONAL PROCESSES 10. How Children Represent Knowledge of Their World In and Out of Language: A Preliminary Report 11. Spatial Concepts, Spatial Names, and the Development of Exocentric Representations 12. Imagery and Cognitive Development: A Teleological Approach 13. Individual Differences in Solving Physics Problems 14. Representing Knowledge Development