Piaget's cognitive development theory

1. Sensorimotor

1.1. Birth to 18-24 months old

1.2. Object permanence: object exists even when out of sight

1.3. Very active child: pushing, grabbing, shaking

2. Preoperational

2.1. 2 to 7 years old

2.2. Very curious

2.3. Child can communicate with words and pictures along with numbers

3. Concrete Operational

3.1. 7 to 11 years old

3.2. Practical child

3.3. Logical thinking

3.4. Child learns best by doing hands on things

4. Formal Operational

4.1. Adolescence to adulthood

4.2. Reflective child

4.3. Abstract thinking and hypothetical reasoning