Birth - 2 years 2. Concrete operational 7 - 11 years 4. The Sensorimotor Period 1. An explosion in mental representation. Children reason better about causation.
Children can classify and organize objectsbased on several characteristics.
Increasing ability to manipulate symbols. Hypothetico-deductive reasoning 2. Propositional thought 3. Physical Reasoning 2. Not as egocentric as once thought.