The standard argument for the incompatibility of determinism and moral responsibility employs the following two premises:A person is morally responsible for what he has done only if he could have done otherwise:A person could have done otherwise only if his action was not causally determined.While premise two has been the focus of an enormous amount of controversy, premise one until recently has remained virtually unchallenged. However, since Harry Frankfurt’s provocative paper in 1969, premise one, which he dubbed the principle of (...) alternate possibilities, has begun to attract its share of the debate. Frankfurt argued that PAP is false and that its falsity undermines the position of those who assert the incompatibility of determinism and moral responsibility. Two previous papers I wrote were devoted in part to showing that Frankfurt’s argument is ineffective; one of those papers also argued that, while PAP is indeed false as it stands, if it is appropriately supplemented, it can continue to serve its traditional role in the determinism-responsibility debate. (shrink)