What aspect of cognitive development is Piaget primarily known for?

Piaget is primarily known for his theory outlining the stages of cognitive development in children. He proposed that children progress through a series of distinct stages—specifically, the sensorimotor, preoperational, concrete operational, and formal operational stages—each characterized by different cognitive abilities and ways of thinking about the world.

His research emphasized that children actively construct their understanding of the world through interactions and experiences, and that cognitive development occurs in a sequential manner, where each stage builds upon the previous one. This stage-based approach illustrates how children's thinking evolves over time, leading to increasingly complex cognitive processes. Understanding these stages provides valuable insight into how children learn and develop intellectual skills as they grow.