Jean Piaget · 1896–1980
Cognitive stages
Children are not miniature adults. They construct knowledge through action, and they think in qualitatively different ways at different ages.
Why it matters when you teach
If you argue a four-year-old into conservation, you have only taught them to nod. If you hand them two cups and water, you have given them a problem their mind can grow on. Matching the task to the stage is respect, not lowering the bar.
Core ideas
Sensorimotor (0–2)
Knowing is doing. Object permanence is the great cognitive leap: the world continues when I am not looking.
Preoperational (2–7)
Symbols, language, pretend — and egocentrism, animism, failure of conservation. Magical, not stupid.
Concrete operational (7–11)
Logic about real things: conservation, classification, reversibility. Hypotheticals still need a scaffold.
Formal operational (11+)
Abstract and hypothetical thought. Not every adult lives here all day. Do not assume a ten-year-old does.
In the room
- When they insist the smashed ball of clay is 'more,' wonder with them. Pour it back.
- Use objects before symbols. Fingers, then pictures, then numbers.
- Pretend is cognitive work in the preoperational years — protect it.
- A child who cannot take your perspective is not being rude yet. Show them your view with a prop, not a scolding.
Try this
- Conservation demo with juice in a short wide cup and a tall thin one. Ask, don't tell.
- Three-mountain style: sit on opposite sides of a block castle. 'What do I see?'
Hold it lightly
- He underestimated many children — some skills appear earlier with the right materials.
- Culture and teaching change the timetable. Stages are a map, not a cage.