How many possible answers are there to the problem of the individuation of actions? In this dissertation I shall confine myself to but two answers. I will not state categorically that there are no other lines of approach to the problem. I am, however, reasonably confident that no other line is at all feasible and that no one has formulated one. There is the possibility of blending the two answers with which I shall deal, but such a blending would at best be mere temporising. It should become obvious that the two answers are mutually antagonistic and that no such blending could be convincingly defended.