Explanation:

- Jean Piaget proposed the theory of cognitive development. He explained how children construct a mental model of the world.

- Piaget's theory has four stages: sensorimotor, preoperational, concrete operational, and formal operational.

- Goffman is known for his work on symbolic interaction and the concept of dramaturgy in sociology.

- Erik Erikson developed the theory of psychosocial development, focusing on social and emotional development through different stages of life.

- Lawrence Kohlberg is noted for his theory of moral development, which extends upon Piaget’s work to explain the stages of moral reasoning.

- Jean Piaget