Jean Piaget


Best Known For

Found the stages of mental devolopment called schema. Also created the fields of cogintive theory and developmental psychology.

Occupation: Psychologist and Biologist

Birth Date: August 9th, 1896 in Neuchâtel, Switzerland

Death Date: September 16th, 1980

This test was measure a child's intellegence and draw connections between a child's age and the nature of his errors.


The four stages of mental development were sensorimotor which involves learning through motor actions, and takes place when children are 1 to 2 years old. The "preoperation stage," children aged 3–7 develop intelligence by using their natural intuition.

During the "concrete operational stage," children 8–11 develop cognitively through the use of logic that is based on concrete evidence. "Formal operations," the fourth and final stage, involves 12-to-15-year-olds forming the ability to think abstractly. Piaget called his collective theories on child development "Piaget’s Genetic Epistemology."

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