Kohlberg's theory of moral development proposes 6 stages grouped into 3 levels of moral reasoning:
1) Pre-conventional morality focuses on obedience and self-interest.
2) Conventional morality emphasizes maintaining social order and relationships.
3) Post-conventional morality prioritizes social contracts and universal ethical principles.
Kohlberg studied how children reason through moral dilemmas like the Heinz dilemma. His work influenced education by suggesting teachers encourage perspective-taking and discussions that are slightly above students' current stage of reasoning. While criticized, Kohlberg's theory highlighted the role of environment and experience in developing morality.