Some reflections on learning and individual differences / Robert M. Gagne -- Aptitude-treatment interaction as a framework for research on individual differences in learning / Richard E. Snow -- Cognitive diversity: a framework of learning / John L. Horn -- A taxonomy of learning skills / Patrick C. Kyllonen and Valerie J. Shute -- Individual differences and skill acquisition / Phillip L. Ackerman -- Individual differences in children's strategy choices / Robert S. Siegler and Jamie Campbell -- Individual differences in practical knowledge and its application / Robert J. Sternberg and Richard K. Wagner -- Inference and discovery in an exploratory laboratory / Valerie J. Shute, Robert Glaser, and Kalyani Raghaven.