Piaget's theory argues that we have to conquer 4 stages of cognitive development. Only once we have gone through all the stages, at what age can vary, we are able to reach full human intelligence.

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Sources:
https://www.biography.com/people/jean...
https://en.wikipedia.org/wiki/Jean_Pi...
https://en.wikipedia.org/wiki/Piaget%...
http://www.appsychology.com/Book/Deve...

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