1) The document describes Lawrence Kohlberg's stages of moral development, which include pre-conventional, conventional, and post-conventional stages.
2) In the pre-conventional stage, morality is based on obedience to rules and punishment/reward. In the conventional stage, morality is based on conforming to social norms and laws.
3) In the post-conventional stage, morality involves reasoning based on self-chosen ethical principles of justice, even if they contradict social norms or laws. Only a small minority of people reach this highest stage of moral reasoning.