The stages were named after psychologist and developmental biologist Jean Piaget, who recorded and studied the intellectual development and abilities of infants, children, and teens.

Piaget believed that teaching should provide rich experiences for students to explore and discover on their own.

Piaget describes stages of cognitive development 1923 - 1952. Photo: Jean Piaget. Jean Piaget (1896-1980) ... The stage from 18-24 months to 7 years Piaget called preoperational, ...

Piaget's work with children led to his identifying four main stages in cognitive development. Her first two years of life, the sensori-motor stage, a child learns through her body.

Jean Piaget’s theory of cognitive development has been a central framework for understanding how children grow and learn. His model describes development through four sequential stages ...