Bittner R. Autonomy, and then. Philosophical Explorations. 2002;5(3):217-228.Among the numerous conceptions of autonomy, three are particularly important: Kant's notion of humans' being subject, and subject only, to moral laws they gave themselves, Frankfurt's idea of persons' willing and acting deriving from the essential character of their wills, and the popular conception of persons' being master over whether others do or do not certain things to them. Kant's moral conception of autonomy, it is argued, is untenable because the moral character of a law and its self-givenness are incompatible. Frankfurt's idea suffers from the fact that we cannot give substance to talk of the essential character of one's will. The third conception is pract...