In this thread I’ve been talking about how I go about writing a trade book, and I am now dealing with the question of how an author chooses what to write about. I was indicating earlier that some of my graduate students have a difficult time knowing what to focus on in their dissertations. Most of my students come up with amazingly good ideas; but every now and then I have a student who simply can’t decide what to do. It’s hard because the dissertation is their first book, it has to be academ...