Piaget's theory argues that we have to conquer 4 stages of cognitive development: 1. Sensori-Motor Stage 2. Pre-Operational Stage 3. Concrete Operational Stage 4. Formal Operational Stage Only once we have gone through all the stages, at what age can vary, we are able to reach full human intelligence. Never miss a new video with our newsletter: http://eepurl.com/dNU4BQ Join and support us! www.patreon.com/sprouts www.sproutsschools.com Special thanks for our patron supporters: Ville Medeiros, Chutimon Nuangnit, Cedric Wang, Mike, Eva Marie Koblin, Julien Dumesnil, Mathis, and the others. You are amazing !!! Join our supporters and help us reach students and teachers worldwide with friendly videos that explain difficult things simple. Subscribe to our channel, write a comment or support us as a Patron: www.patreon.com/sprouts Sources: https://www.biography.com/people/jean-piaget-9439915 https://en.wikipedia.org/wiki/Jean_Piaget https://en.wikipedia.org/wiki/Piaget%27s