Piaget's Schematic Development
Piaget came to the conclusion that all children will resemble some patterns in their behaviour and the way they 'think' & 'understand'.
This helps them come to a reasoned conclusion about the world around them.
For example: A child may develop a schema that all trousers are blue, simply because their trousers are blue.
While schemas are a constant feature of each stage of cognitive development, they change in content and sophistication, just as the stages do.