Stage 1. Sensori-motor stage. The first stage corresponds from birth to infancy. This is the stage when the child who is initially reflexive in grsping, sucking and reaching becomes more organized in his movement and activity.
Stage 2. Pre-operational stage. The preoperational stage covers from about two to seven years old, roughly corresponding to the preschool years. Intelligence at this stage is intuitive in nature.
Stage 3. Concrete-Operational Stage. This stage is characterized by the ability of the child to think logically by only interms of concrete objects.this covers approximately the ages between 8-11 years or the elementary school years.
Stage 4. Formal Operational Stage. In the final stage of formal operations covering ages between 12 and 15 years, thinking becomes more logical.they can now solve abstract problems and can hypothesize.
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