That certain suicides (which can be designated as rational) ought not to be interfered with is closely tied to the notion of the "right to autonomy." Specifically it is because the individual in question has this right that interference is prohibited. A proper understanding of the right to autonomy, while essential to understanding why suicide is not always to be prevented, also serves to elucidate further the notion of rational suicide itself. Second-level autonomies, including free action, authenticity, effective deliberation, and reflection on moral values, determine the extent of first-level autonomy. A free act is intentional and voluntary. Authenticity involves consistency of action with values, interests, attitudes, disposition, and metaphysical worldview. Effective deliberation involves the weighing of alternatives and their consequences, followed by decision. Moral reflection involves choice of values. When the above criteria are satisfied, a person is autonomous and his suicide, if it should occur, is rational. (Author/ABL)