1. Piaget's Stages of Development
1.1. The cognitive development stages: 1. Sensorimotor (during the first two years)
1.2. Sub-stage 1: Reflex activity
1.3. Sub-stage 2: Primary circular reactions
1.3.1. Sub-stage 3: Secondary circular reactions
1.3.1.1. Sub-stage 4: Coordination of secondary schemes
1.3.1.1.1. Sub-stage 5: Tertiary circular reactions
1.3.1.1.2. The cognitive development stages: 3. Concrete operational (7-11 years)
1.3.1.1.3. At this stage, the child understands the principle of conservation.
1.3.1.1.4. The child starts to apply logic, working things out through thought, not just action.
1.3.1.1.5. A child will group, count and measure objects at this stage.
1.3.1.2. The cognitive development stages: 4. Formal operational (12-15 years)
1.3.1.3. The child is now systematically experimenting, forming hypotheses and testing them out by trying out alternatives, just like scientists do.
1.3.1.4. Piaget recognised that not everyone expresses skills at this stage as if they were scientists in a laboratory
1.3.1.5. He thought that every adult may reach this stage in their own area of expertise – farmers, bakers, mechanics and so on.