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 studies clearly highlight two qualitative advances made during the preoperational period. The first is the breakthrough of representational intelligence, beginning around 2 years of age. The second is the emergence of coordinated representational thought, beginning around 4 years of age. This paper focuses on the second advance, which…

This paper examines the category-theoretic formulation of cognitive development introduced by Piaget in the late 1960's and elaborated during the 1970's. The new theory is interpreted as the focal point of Piaget's investigations into topics such as function, correspondences, and commutability. Hypotheses arising from Piaget's new model were…

The concept of autonomous identity, derived from Piaget's theory of personality, is distinguished from other applications of the term "autonomy" in psychological theory. Introductory comments suggest that both biological and mental development express autonomy in the same two senses: as self-regulating and progressively self-liberating.…