Gradually he pieced together a "blueprint" for normal cognitive development in children ... the toy still existed. Piaget found four major developmental stages (with many subdivisions).

Jean Piaget's ideas about child development continue to influence ... An example illustrating egocentrism in this stage is when Piaget observed his young daughter talking on the phone and assuming ...

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 ...