Conservation Ability of Children (Psychology) Link to theory Piaget's four stage theory of cognitive development Piaget's theory is that children move through four stages (birth to adulthood). The stages are: Sensorimotor stage (birth to two years) construct their understanding of the world be co-ordinating their sensory experience with motor abilities. Sensorimotor stage has different areas ... thinking. Other areas to Pre-Operation stage are symbolic thinking, egocentrism, animism, transformation and reversibility. Concrete Operational Stage (seven years to 12 years) children knowing what t...

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