Alec Corper wrote:
I don't mean to be contentious, but I think this is a wrong question to be asking. As an instructor I prefer to stay focussed on what I need to teach and how best to teach it so that those who want to learn will get the best chance to do so. This may seem the same as thinking about student retention, but it isn't. It is not my job to "keep" students, it is their responsibility to learn.
It all depends on how you teach what you need to teach. I agree with this last sentence, ultimately my role as an instructor is to inspire my students to want to learn.