His experience and observations at the Alfred Binet Laboratory were the beginnings of his theory of cognitive development. Piaget believed that children are not like "little adults" who may know less; ...

Jean Piaget ... to talk with children, play with them, ask them questions, and try to understand their thinking. Gradually he pieced together a "blueprint" for normal cognitive development ...

children enter the preoperational stage at around two years old Despite being over 70 years old, Piaget's theory is "still one of the prevailing theories in terms of cognitive development," Dr Sam ...

a child thinks in a completely different way. This conviction led Piaget to develop his influential theory of cognitive development. He proposed that children pass through four main stages ...