Jean Piaget was a Swiss psychologist who had a great influence on what is known about the way children learn. According to Piaget, these four stages appear in the same order in all children, but not at the same time.
Introducing Piaget. Jean Piaget was one of the most significant contributors to our current understanding of how children think and learn, from birth to adolescence. Located in our child studies section at 155.413/HALP