||There are three fundamental questions guiding Kant's ethics: (1) What is the supreme principle of morality? (2) What makes this principle binding? and (3) What duties arise from it? In answering the first question, Kant seeks to derive a principle of morality from the universal form we are capable of giving our maxims, whereby we exercise our power of self-legislation or what Kant calls ‘autonomy’. In answering the second question, Kant seeks to justify the principle of autonomy as a presupposition of rational agency and as a ‘fact’ illustrated in common moral thought, judgment, and feeling. In answering the third question, Kant offers a system of duties, both self-regarding and other-regarding. While commentators disagree over its ultimate success, Kant’s ethics presents us with one of the most systematic accounts of morality, autonomy, and agency in the history of moral thought, and it continues to have a lasting influence on contemporary ethics.