I had a situation once in my class where my grading rubric prevented a serious argument.
A student came to me after a midterm exam to contest his grade. He was not satisfied with the points he had earned and believed that his answers deserved a better grade. I had structured the questions for the exam very carefully and as a result creating a rubric was easy.
Each essay question had 7 components, and each component required an accompanying example. Because I had such a specification, I was able to demonstrate to the student that he had ignored certain components… >>>