ABSTRACT
This chapter considers critically some of Jean Piaget's original achievements and reviews some of his important errors. It aims to contribute to human science from a constructivist, dynamic or dialectical perspective—to explain normal human change: development and learning. Notice that human change is prompted, among others, by maturation and experience, and it leads to individual differences. Piaget was a leader of cognitive developmental theory in humans and of dialectical constructivism—a middle way between rationalism and empiricism. His epistemological orientation anticipated aspects of the contemporary dynamic systems approach. The chapter discusses his dialectical constructivism and aspects of his epistemology and cognitive development, examines problems raised. In psychological processes, affirmations are schemes relevant for the intended praxis; negations are either external features of the situation that are inconvenient and must be overcome or internal schemes that are misleading, because they propitiate unwanted performances.
