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Piaget developed a theory of child cognitive development. He started the idea that cognitive development is a process. Intelligence was previously regarded as a set trait.

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Piaget's legacy is still in place today. Many education programs adapted his stages of development in their curriculum. The stages also improved education by teaching children in the level's they are developmentally ready. The critics of Piaget question how he selected children for his studies. It is very hard for researchers to accurately replicate his studies. Although his work is controverisal he paved the way for future research in childhood development and created an interest in the subject

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The formal operational stage is the fourth and final stage in Piaget's theory. Begins around 12 years old and continues until adulthood. Able to comprehend abstract ideas

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The concrete operational stage is the third stage of Piaget's theory. Stage of development when a child is capable of performing many mental operations and thoughts. The thoughts are concrete concepts.

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Second stage in Piaget's theory. Stage begins around age 2. As children begin talking. This stage lasts until about age 7. This includes engaging in symbolic play and manipulate symbols. Children are often egocentric and intuitive at this age.

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Intentional adaption to specific situations. An infant grows from taking apart an object to also trying to put it back together

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This typically lasts from about 4 – 8 months. Now babies repeat pleasurable actions that involve objects as well as actions involving their own bodies.

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Coordinating sensations and schemas. Actions are repeated because infants find pleasure.

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First stage in Piaget's theory, Sensorimotor stage. In Piaget's theory infants learn about the world through impressions and motor activites