This document provides an overview of Jean Piaget's theory of cognitive development in primary school aged children. It discusses Piaget's life and background, focusing on his observations of his own children which informed his theories. It then describes the concrete operational stage from ages 7-11, where children begin logical thinking about concrete concepts but struggle with abstract ideas. Key developments include understanding reversibility and inductive/deductive reasoning. Cognitive milestones are outlined, such as understanding time, attention span, and early reading skills. The document also briefly discusses information processing models of memory.