A Quora answer worth repeating here.
It’s interesting how history repeats itself if you know where to look. Sometimes, even if you don’t know where to look, serendipity looks you right in the eye and smacks you upside the head.
Perhaps there is nothing more controversial in a classroom as the grading procedures. I have long been an staunch critic of the traditional “percentage” system of grading, for a number of reasons. As I enter the classroom yet again, my controversial system is again called in question, and I feel that perhaps this might be a useful description of why and how I grade the way I do.