Piaget's Theory of Cognitive Development
Four stages of cognitive development that describe how children construct knowledge at different ages.
The Four Stages
Jean Piaget proposed that children progress through four universal stages of cognitive development:
Sensorimotor (0–2 years) — Learning through senses and actions. Key milestone: object permanence.
Preoperational (2–7 years) — Symbolic thinking develops, but reasoning is intuitive and egocentric. Children struggle with conservation and reversibility.
Concrete Operational (7–11 years) — Logical thinking about concrete events. Children master conservation, classification, and seriation.
Formal Operational (11+ years) — Abstract and hypothetical reasoning. Adolescents can think systematically about possibilities.
Classroom Application
Piaget's theory reminds educators that children are not miniature adults — they think qualitatively differently at each stage. Instruction must be developmentally appropriate. Hands-on, concrete materials are essential through the elementary years.