Jean Piaget developed:

Jean Piaget developed:

• A. Stages of cognitive development
• B. Eight stages of development
• C. Moral development
• D. Psychosocial development

Answer: (A)

Piaget’s work centers on how children's thinking changes in quality as they grow, unfolding through distinct stages of cognitive development. He proposed four stages—sensorimotor, preoperational, concrete operational, and formal operational—through which kids move from basic, action-based understanding to more abstract and systematic thought. This is why the description “stages of cognitive development” is the best fit: it directly names the area Piaget is famous for and the idea that development occurs in ordered, qualitatively different stages. The other options point to theories by other researchers. Moral development is the focus of Kohlberg, who studied how people reason about right and wrong. Psychosocial development is Erikson’s territory, outlining eight stages of social and emotional growth. Saying there are eight stages is not Piaget’s framework.

Piaget’s work centers on how children's thinking changes in quality as they grow, unfolding through distinct stages of cognitive development. He proposed four stages—sensorimotor, preoperational, concrete operational, and formal operational—through which kids move from basic, action-based understanding to more abstract and systematic thought. This is why the description “stages of cognitive development” is the best fit: it directly names the area Piaget is famous for and the idea that development occurs in ordered, qualitatively different stages.

The other options point to theories by other researchers. Moral development is the focus of Kohlberg, who studied how people reason about right and wrong. Psychosocial development is Erikson’s territory, outlining eight stages of social and emotional growth. Saying there are eight stages is not Piaget’s framework.