The principal critical objective of this dissertation is to examine three contemporary theories about the mind-body problem: dualism, anomalous monism, and functionalism. The dualism examined is closely linked to Cartesian dualism, while functionalism is a form of materialism. Anomalous monism is a kind of dual aspect view. All these theories have a long tradition with different formulations and exponents. I examine three contemporary exponents of these views: Saul Kripke, a dualist, Donald Davidson, an anomalous monist, and Daniel Dennett, a functionalist. (...) ;I argue that each of these theories is incorrect or has serious difficulties. The chief difficulty for dualism is in giving an account of mind-body interaction. The chief difficulty for anomalous monism is that internal tensions within the theory relating to Davidson's conception of physical events and scientific laws have the consequence that anomalous monism applies to the entities of physics and chemistry but not to events in the brain. The most serious difficulty for functionalism is in accounting for the qualities of subjective experience. ;I then discuss two criteria for identifying mental phenomena: incorrigibility and intentionality. I consider the problem of mind-body interaction as a problem for dualism. I argue that the mind-body problem is misconceived in that it is supposed that a univocal definition of 'physical' can be given. I state three different definitions of this term: one containing a scientific conception, one an objective conception, and one a personal conception. ;In my final chapter, I formulate a plural aspect view that accounts for mind-body interaction. On this view, mind is an aspect of body and body is an aspect of mind. This plural aspect view can be derived from a more general theory I call Viewpoint Pluralism. (shrink)