Who identified the four distinct stages of children's intellectual development?

Who identified the four distinct stages of children's intellectual development?

بچوں کی فکری نشوونما کے چار الگ الگ مراحل کی نشاندہی کس نے کی؟
Explanation

Jean Piaget identified four cognitive development stages:

  1. Sensorimotor
  2. Preoperational
  3. Concrete operational
  4. Formal operational

He focused on how children's thinking evolves with age and experience.