Abstract
In this paper I shall attempt to locate and articulate Aristotle's answer to a foundational question in the theory of action—viz., 'what is the proximate (efficient) cause of action?' This task is certainly of historical importance, since one cannot hope to understand Aristotle's interesting and influential theory of action without understanding his views on the proximate efficient cause of action. But the present project is not, I should think, of historical interest alone; for it has recently been argued by a leading figure in the study of action, Myles Brand, that "What [proximately] initiates action?' is the fundamental question in action theory, and we shall see that Aristotle has the makings of a very plausible answer.