According to Jean Piaget, a Swiss psychologist who earned a world wide reputation by studying how child's thinking process develops. To him there are four stages, no child says Piaget, can be pushed or hurried from one of this stages to another.
- Lack of awareness (below 6 months)
- Object constancy (after 6 months)
- Concervancy of mass or volume (7 - 11 yrs)
- Adult conceptualization (11 yrs)
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