Reviews five books: (1) "Modularity and Constraints in Language and Cognition" (Gunnar and Maratsos); (2) "Beyond Modularity: A Developmental Perspective on Cognitive Science" (Karmiloff-Smith"; (3) "The Self-System: Developmental Changes between and within Self-Concepts" (Oosterwegel and Oppenheimer); (4) "Children's Saving: A Study in the Development of Economic Behavior" (Sonuga-Barke and Webley); and (5) "Visual Perception and Cognition in Infancy" (Granrud). (TM)