As educators, it is our obligation to continuously improve our courses. In my experience, I mainly do revisions while I am teaching the course. Here's what I mean: if I find that something in the coursework needed improvement, I'll try to revise it for the current class. Sometimes this is not possible and I am left with making the revision for the next class. So sometimes, I'll create the revision and save it for the the class. Othertimes, I'll just make the note and create the revision prior to the next time I teach the course.
