Lawrence Kohlberg's stages of moral development, which propose that individuals progress through six stages of moral reasoning from pre-conventional to post-conventional levels.
Carol Gilligan's theory of moral development, which focuses on how moral reasoning differs between men and women, highlighting the importance of care and relationships in moral decision-making.
Jean Piaget's theory of moral development, which emphasizes how children's moral reasoning progresses from a heteronomous stage, where rules are seen as fixed and externally imposed, to an autonomous stage, where rules are seen as flexible and internally based.