The problem of exclusion threatens non-reductive physicalist theories of the mind by implying that they cannot account for mental causation. This paper attempts to clarify what exactly the exclusion problem is, and, given the problem, to survey the theoretical options open. First I reconstruct the problem from its most influential sources (Malcolm and Kim), showing that it should be understood as an ontological rather than an explanatory problem. I then distinguish the problem from some consequences that seem to follow from (...) it. Finally I sketch a map of possible answers to exclusion. (shrink)