Piaget in Education: Conservation and Egocentrism
Piaget in the Classroom
Piaget’s theory was not just an academic description of how children think — it had direct implications for education. If children at different ages are genuinely incapable of certain types of reasoning, then teaching them content that requires that reasoning is pointless. Piaget’s key educational message was: match what you teach to the stage of thinking the child has actually reached.
This influenced how schools are designed and how teachers plan lessons. Primary school classrooms with hands-on materials, practical activities and discovery learning all reflect Piaget’s insight that children at the concrete operational stage learn best through interaction with real objects, not through abstract explanation alone.
Egocentrism and Its Reduction
In the pre-operational stage, children are egocentric. This does not mean they are selfish — it means they genuinely cannot take the perspective of another person. Piaget demonstrated this with his ‘Three Mountains Task’, in which children were asked to describe what a doll placed on the other side of a model mountain range would see. Pre-operational children consistently described what they themselves could see, not what the doll’s position would show.
As children move into the concrete operational stage, egocentrism gradually reduces. They begin to understand that other people have different viewpoints, feelings and knowledge. This has important educational implications: collaborative group work, debate and perspective-taking activities become possible and valuable once children reach this stage.
Egocentrism (the inability to take another’s perspective) is characteristic of the pre-operational stage (2–7 years). It reduces as the child enters the concrete operational stage (7–11 years), enabling collaborative and perspective-taking activities in education.
The Development of Conservation
Conservation is the understanding that quantity does not change just because appearance does. Pre-operational children fail conservation tasks — they say a tall thin glass contains more water than a short wide glass even after watching the same water being poured between the two. They focus on the height of the water (what they can see) rather than reasoning about quantity.
Piaget believed children could not reliably pass conservation tasks until the concrete operational stage. In education, this means that until around age seven, lessons should not assume children understand that number, volume or mass are preserved across changes in arrangement or appearance.
McGarrigle and Donaldson’s naughty teddy study directly challenged Piaget’s claims about conservation. The aim was to investigate whether pre-operational children could demonstrate conservation when the change in arrangement was made accidentally rather than intentionally by an adult.
Method: Children aged between 4 and 6 were shown two rows of counters that were the same length. In the standard Piaget condition, the experimenter deliberately spread out one row and asked if there were now more counters. In the naughty teddy condition, a toy teddy ‘accidentally’ scattered one of the rows, and the same question was asked.
Results: In the standard condition, most children gave the incorrect answer (saying the longer row had more counters — matching Piaget’s findings). But in the naughty teddy condition, a much higher proportion of children gave the correct answer, saying the number was still the same.
Conclusion: McGarrigle and Donaldson concluded that Piaget had underestimated children’s conservation ability. When the change was accidental and natural, younger children could conserve — suggesting the issue was with Piaget’s task design rather than with the children’s cognitive capacity. The deliberate act of the experimenter spreading the counters may have signalled to children that something had changed, leading them to give the wrong answer.
Hughes’ policeman doll study challenged Piaget’s claims about egocentrism. The aim was to test whether pre-operational children could take another’s perspective when the task was made more meaningful and understandable.
Method: Hughes used a model with walls dividing it into sections, and placed two toy policemen dolls at various positions. He asked children to hide a boy doll so that neither policeman could see it. The task required the child to take the visual perspective of both policemen — a more complex perspective-taking challenge than Piaget’s Three Mountains Task, but also more meaningful because it had a real narrative purpose.
Results: Most of the children successfully hid the boy doll where neither policeman could see it, demonstrating that they could take the perspectives of the two policemen — something Piaget’s theory predicted they should not be able to do at this age.
Conclusion: Hughes concluded that pre-operational children are less egocentric than Piaget claimed. When the task is meaningful and involves a familiar scenario (hiding from a policeman), even young children can take another’s perspective. This suggests Piaget’s Three Mountains Task was too abstract and unfamiliar, leading to an underestimate of children’s abilities.
Both McGarrigle and Donaldson (naughty teddy) and Hughes (policeman doll) found that children showed conservation and perspective-taking ability earlier than Piaget claimed, when tasks were made more natural and meaningful. Both studies challenge the idea that children’s thinking is as limited as Piaget’s original tasks suggested.
Implications for Education
The findings of McGarrigle and Donaldson, and Hughes, have important implications for how we understand and apply Piaget in education. If children are more capable than Piaget’s original tasks suggested, then earlier introduction of collaborative and perspective-based activities may be appropriate. However, Piaget’s core educational insight remains valid: the cognitive demands of a lesson should be matched to where the child actually is developmentally, not where a teacher assumes they should be.