Piaget's theory of cognitive development - Wikipedia
https://en.wikipedia.org/wiki/Piaget%27s_theory_of_cognitive_development
WEBPiaget proposed four stages to describe the development process of children: sensorimotor stage, pre-operational stage, concrete operational stage, and formal operational stage. [5] Each stage describes a specific age group. In each stage, he described how children develop their cognitive skills.
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