Age Range
Description of Stage
Developmental
Phenomena
Birth to nearly 2 years of age
Sensorimotor
Experiencing the world through the
senses and exploration (looking, hearing, touching, mouthing, etc.)
•Object permanence
•Stranger anxiety
About 2 to 6 years of age
About 7 to 11 years of age
About 12 years of age through
adulthood
Preoperational
Representing things with words and images but have no logical reasoning abilities
•Pretend play
•Egocentrism
•Rapid language
  development
Concrete operational
Thinking logically about concrete
events; grasping concrete analogies
and performing math operations
•Conservation
•Mathematical transformations
Formal operational
Abstract reasoning; reflection; thinking about thinking
•Abstract logic
•Potential for moral reasoning
Piaget’s Stages of
Cognitive Development
Arranged by Dr. Gordon Vessels 2005