The processes of assimilation and accommodation were most clearly highlighted by Jean Piaget in his cognitive development theory.
Jean Piaget suggested in his cognitive development theory that intelligence changes as children grow. A child's cognitive development is not just about obtain knowledge, the child has to develop or construct a mental model of the world through which they can adapt and learn things.
Piaget divided children’s cognitive development in four stages, each of the stages represent a new way of thinking and understanding the world.
He called the First stage as sensorimotor intelligence, Second as preoperational thinking, Third as concrete operational thinking and Fourth stage is of formal operational thinking. Each stage is correlated with an age period of childhood, but only approximately.
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