What is Aristotelian Prohairesis?

A few weeks back, I gave my last talk for the semester, presenting a paper at the 7th Felician Ethics conference, asking and answering the question just what does Aristotle mean by that slippery term prohairesis?

Should it be taken to be what many translators -- at least in the Nicomachean Ethics -- have made it out to be, namely "deliberative choice"?  Does that really encompass all of the uses Aristotle makes of this term, not only in the two Ethics, but also in works as diverse as the...