Constructivist theory must choose between the hypothesis that felt perturbation drives cognitive development (the priority of felt perturbation) and the hypothesis that the particular process that eventually produces new cognitive structures first produces felt perturbation (the continuity of process). There is ambivalence in Piagetian theory…

Comments on Lewis's ideas about reconciling stage and specificity in neo-Piagetian theory in this issue. Focuses on whether general stages, domain specificity, and individual diversity are compatible from a nonlinear, dynamic perspective. Suggests that, by using catastrophe theory, intra- and interindividual diversity and domain specificity can be…

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…

Considers the mind of the epistemic psychologist, a constructivist knowledge creator within a scientific framework, guided by the social world of scientific institutions. Suggests that Piaget and Vygotsky shared respect for complexity of phenomena and were consistently developmental in their theories. A reconsideration of their common heritage…