Kohlberg's theory of moral development proposes that individuals progress through six stages of moral reasoning grouped into three levels - pre-conventional, conventional, and post-conventional. At the pre-conventional level, morality is based on obedience and self-interest. The conventional level considers societal expectations and laws. The post-conventional level involves reasoning about universal ethical principles and justice. Kohlberg believed most people only reach the conventional level of moral reasoning. The educational implications aim to help students progress through the stages by considering cooperation, individual rights, social order, and universal principles.