The author reflects on Piaget's 1972 article, "Intellectual evolution from adolescence to adulthood," addressed to questions regarding what he alleged to be the final, most advanced level of cognition in his developmental stage theory--formal operations, as described in his 1958 volume coauthored with Inhelder, "The growth of logical thinking from…

Piaget's last two works may add a new level of coherence and generality to his theories, which are grounded in an insight about the interdependence of reality and knowledge about reality. Piaget expanded Kant's epistemology to encompass three systems operating in the frames of biology, psychology, and culture. (MDM)

Piaget's last writings in the 1980s and early 1990s contained both a coherent constructivist account of explanation in science and specific suggestions for revising the logic of operations as a logic of meanings. Demonstrates the interdependence of these two aspects of his work by examining the merits of Piaget's revised logical competence model…