The document discusses Lawrence Kohlberg's theory of moral development. Kohlberg proposed that moral reasoning progresses through six stages grouped into three levels - pre-conventional, conventional, and post-conventional. At the pre-conventional level, reasoning is based on obedience and self-interest. At the conventional level, maintaining social order and relationships is important. At the post-conventional level, reasoning is based on abstract ethical principles and justice. Kohlberg believed people progress sequentially through these stages as their reasoning becomes more sophisticated.