Beginning work on ethics, psychology, and situations

I’ve begun constructing a brief summary of Kwame Anthony Appiah‘s [amazonify]0674026098::text::::Experiments in Ethics[/amazonify] for next week’s philosophy club meeting.  I intend to focus on three main concepts, beginning with the assumption of virtue ethics, moving through the challenges of situationist ethics, and ultimately applying a hybrid of those two concerns to the situations provided by the book.  I intend to include a bit of my own interpretations and examples.  It is clear that Aristotle’s Nicomachean Ethics have a great relevance here, but I am looking for a bit more information on the  psychological side of things, perhaps I’ll see if William James had something to contribute here.