Piaget's theory of cognitive development outlines four stages: sensorimotor (birth to 2 years), preoperational (2 to 7 years), concrete operational (7 to 11 years), and formal operational (12 years and up). Each stage marks significant developmental milestones, including the development of object permanence, egocentrism, logical reasoning, and abstract thought. Key concepts include schema, assimilation, accommodation, conservation, and the ability to think about moral and philosophical issues.
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