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Piaget's idea refers to the theory of cognitive development proposed by Swiss psychologist Jean Piaget. It suggests that children go through distinct stages of mental development, and their understanding of the world evolves as they grow.
Assimilation is when new information is incorporated into existing mental structures or schemas.
Accommodation is when existing mental structures or schemas are adjusted or modified to fit new information.
Object permanence: Object permanence is the understanding that objects continue to exist even when they are out of sight.