ABSTRACT
This chapter will introduce the central concepts of Piaget's theory. It will also show how the theory can be initially characterised as a transformational theory having its roots in both biological and philosophical presuppositions about the nature of mind and knowledge. In particular, it will explain the Kantian notion of the basic categories of thought and show how Piaget believes that these categories including quality, quantity, space-time relationships, means-end relationships and values are laid down during the sensori-motor stage.
