Perceptual categorization in the infant / Leslie B. Cohen and Barbara A. Younger -- Perceptual categorization and sensorimotor intelligence during infancy: a comparison of theoretical perspectives / Richard De Lisi -- Is the concept of the concept still elusive or what do we know about concept development? / Irving E. Sigel.
The new functionalism and Piaget's program / Harry Beilin -- Why are new trends in conceptual representation a challenge to Piaget's theory? / Ellin Kofsky Scholnick -- Prototype classification and logical classification: the two systems / Eleanor Rosch -- On doubling the concept 'concept' / Lila R. Gleitman, Sharon Lee Armstrong, and Henry Gleitman --There is one classification system with a long developmental history / Edith D. Neimark -- The derivation of concepts and categories from event representations / Katherine Nelson -- Early concept formation: models from Nelson and Piaget / Rodney R. Cocking -- Two different kinds of hierarchical organization / Ellen M. Markman -- Classes, collections, and other connections / Ellin Kofsky Scholnick.