Piaget's Periods of Development

Period I Sensori-Motor Intelligence (birth to 2 years)
Physical activities are organized around sucking, grasping, and hitting.
Period II Preoperational Thought (2 to 7 years)
Individuals use symbols and internal images.
Thinking is not systematic and not logical.
Thinking is different from that of most adults.
Period III Concrete Operations (7 to 11 years)
Individuals can think logically and systematically if linked to concrete objects and/or activities.
Period IV Formal Operations (11 to adulthood)
Individuals can think logically and systematically.
Individuals can think abstractly.

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