 The concept of alienation identifies a distinct kind of psychological or social ill; namely, one involving a problematic separation between a self and other that belong together. So understood, alienation appears to play a largely diagnostic or critical role, sometimes said to suggest that something is awry with both liberal societies and liberal political philosophy. Theories of alienation typically pick out a subset of these problematic separations as being of particular importance, and then offer explanatory accounts of the extent of, and prognosis for, alienation, so understood. Discussions of alienation are especially, but not uniquely, associated with Hegelian and Marxist intellectual traditions.