Lawrence Kohlberg was an influential American psychologist best known for his work in moral development. He built upon the ideas of Jean Piaget to propose a theory consisting of six stages of moral reasoning, grouped into three levels: pre-conventional, conventional, and post-conventional. These stages reflect a progression in moral understanding from a focus on self-interest to a more abstract understanding of justice and human rights. Kohlberg's research involved presenting subjects, primarily children, with moral...