Jean Piaget was a Swiss psychologist who studied cognitive development in children. He proposed that children move through stages of intellectual growth: Sensorimotor stage (0–2 years) Preoperational stage (2–7 years) Concrete operational stage (7–11 years) Formal operational stage (12 years and above) This theory helps understand how children think and learn at different ages.
Who classified intellectual development into stages of sensorymotor, preoperational and operational stages?
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