Piaget's theory of cognitive development: schemas, assimilation and accommodation, and the four stages of development with their key features.

What this dot point is asking

Edexcel wants you to explain Piaget's theory of how children's thinking develops: the idea of schemas, the processes of assimilation and accommodation, and the four stages with their key features. This is the central theory of Topic 1, and the Piaget and Inhelder (1956) core study tests it, so know the stages and processes precisely.

Schemas, assimilation and accommodation

Piaget argued that children are like little scientists who actively build their understanding rather than passively receiving it. When a child meets something new, they try to assimilate it into a schema they already have. If it does not fit, this causes disequilibrium (a feeling of imbalance), so the child must accommodate by adjusting their schema until balance (equilibrium) is restored. Through repeated cycles of assimilation and accommodation, schemas become more detailed and accurate.

For example, a toddler with a schema for "dog" (four legs, fur, tail) may at first call a cat a dog (assimilation). When told it is a cat and shown the differences, they accommodate by creating a separate cat schema.

The four stages of development

Two ideas are tested often. Egocentrism is shown by the three mountains task, where young children describe a scene only from their own viewpoint. Conservation is shown by the classic test where liquid is poured from a short wide glass into a tall thin one: a preoperational child says the tall glass has more, while a concrete operational child knows the amount is unchanged.

Evaluating Piaget's theory

You should be able to evaluate the theory. Strength: it was hugely influential and led to discovery-based teaching, where children learn by doing at their own developmental level. Weakness: later research suggests Piaget underestimated children, who can show conservation and reduced egocentrism earlier when the task is made simpler and more familiar, suggesting the stages are not as fixed as he claimed.

Try this

Q1. In which stage does a child develop object permanence? [1 mark]

• Cue. The sensorimotor stage (0 to 2 years).

Q2. Define egocentrism. [2 marks]

• Cue. The inability to see a situation from another person's point of view, typical of the preoperational stage.

Q3. Explain the difference between assimilation and accommodation. [3 marks]

• Cue. Assimilation fits new information into an existing schema unchanged; accommodation changes a schema or makes a new one when information does not fit.