Presents a model of the development of desociocentering, decentering relative to the social group, which is based on Piagetian research and theory and Wernerian concepts. (Author/SS)

Piaget's conceptualization of concrete and formal operations is presented. It is contended that Piaget has obfuscated logic, metaphysics and methodology. (MS)

Presents and reviews Piaget's recent work on equilibration. (BD)

Explores age differences in children's conceptions of play, pretending, and toys. Examines parallel structural changes in other areas of development, such as language acquisition. Subjects for the study were 5-, 7-, 9-, and 11-year-old children. (BD)

To resolve tension between general stages and conceptual specificity in neo-Piagetian theory, R. Case introduced the idea of central conceptual structures. To resolve difficulties of separating developmental level and conceptual diversity, this article reconceptualizes central conceptual structures as self-organizing systems that stabilize in…

Comments on Lewis's ideas about reconciling stage and specificity in neo-Piagetian theory in this issue. Summarizes R. Case's central conceptual structure and its relation to other neo-Piagetian theories. Notes similarities between Lewis and Piaget, suggesting that differences adhere to a limited number of general laws instead of being…

Provides clarification of the Piagetian theory of the development of conservation and reviews the state of knowledge regarding the theory. It is concluded that reasonable evidence exists suggesting that conservation by identity precedes and induces the emergence of conservation by inversion and compensation. (Author/DB)

Several experiments with 8- to 9-year-old children are reported to demonstrate that "decalage" observed between success in problems of conservation of weight, volume, and density is due to the different task situation as presented by Piaget and Inhelder. (Author)