Jean Piaget was a Swish Psychologist. His work (based on observations made on the development of his own kids) has been enormously influential and has sparked numerous studies through out the world.
How Children Think?
According to Piaget, a child does not think like an adult in a less effective manner. The thinking process of children is qualitatively different from the thinking of adults.
The Developmental Stages according to Piaget
Period 1 – The Sensory Motor Period – From Birth to 2 years of age
PERIOD 2 – The Concrete Operations Period – from 2 years to 12 years
Period 3 – Formal Operations Period = 12 tears through Adulthood.