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-From birth to age two, learn through trial and error, rapid cognitive expansion
-use their senses and actions to perceive the world and learn through making mistakes and learning from them, begins their understanding of whats good and bad for you
1.Primary Circular Reactions
-baby repeats actions that are pleasurable to their body
-they will move their body like wiggling their fingers because of the positive stimulation it gives their body
2.Secondary Circular Reactions
-They repeat actions that involve other objects and their body
-If they like the sound or feel of something, like shaking a rattle, they will repeat it
3.Tertiary Circular Reactions
-start to adapt to specific situations, the object they took apart they will now try to put back together
-they are transitioning from just messing around to actually trying to build. higher level of thinking

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-From ages 2 to 7. children learn how to play and manipulate symbols, not using cognitive operation yet, focus on one aspect of a situation, they are egocentric or very focused on themselves and their own needs, begin to play with others, start talking, pretend to be something theyre not, believe inanimate objects have are alive
-Children are focused on their own needs and what they are thinking rather than others around them, they are starting to understand shapes and symbols and are having imaginations and wondering about the world

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-age 7 through 11 you develop logical thought, organized and rational thinking, they can solve things logically but not hypothetically or abstractly, children can classify things, they can understand that although something looks like it has changed in size or value it hasn't, can put things in logical order, can critically evaluate
-Children start to be able to understand more in depth how to logically understand and solve problems, they can now focus on two things at once and start thinking of others around them and what is going on in the world

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-age 12 to adulthood, think abstractly, manipulate ideas in their head, mathematically calculation, think creatively, approach problems in systematic and organized matter, can think about situations before they actually occur and predict outcome
-move from a more trial and error basis to a predicting hypothesizing answering method. Move from a striaght forward way of thinking to one where your ideas and thoughts and ideas constantly change based on abstract thoughts.

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-founded the field of cognitive development as we know of it today
-transformed developmental psychology
-children developmental behavior is intrinsically motivated not extrinsically motivated
-cognitive development is gradual step by step change
-no one thought the way that he did, left a positive mark and changed the way a lot of psychologists thought about learning and developement