 The various dualistic theories of the mind treat the interaction problem in different ways. The theory called ‘dualistic interactionism’ does not, of itself, have anything to say about the problem—although its various proponents (Broad, for example) have proposed solutions to it. ‘Occasionalism’ simply concedes that the “local” counterfactual dependence of the behavior of a physical system on a non-physical event requires a miracle. The theory of pre-established harmony, which substitutes “global” for local counterfactual dependence of voluntary physical movements on the mental states of agents, avoids problems with conservation principles—but secures this advantage at a great price. (Like occasionalism, it presupposes theism, and, unlike occasionalism, it entails either that free will does not exist or that free will is compatible with determinism.) ‘Epiphenomenalism’ simply denies that the mental can affect the physical, and contents itself with an explanation of why the mental appears to affect the physical.