... from its own point of view and no one else's. His second stage is the Pre-operational stage. This is from 2-7 years of age. Things are exactly how they seem and the child lacks logical thought. The child cannot deal with seriasation and can only concentrate on one thing at a time. A child could complete a task but only by trial and error. Language develops at this point. His third stage is the Concrete operational stage. At this age (7-11) a child cannot sort out mental problems. The child can deal with reversibility and can conserve. His last stage was the Formal operational stage and spans the 11-15-age range. The child can now sort out mental problems and can think hypothetically. The child can ask questions about itself and can experiment and search systematically and methodically to solve problems. These four stages were split further into two pre-operational sub-stages, ...

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