“This is not a C paper!”  “This answer deserves more points.”  “Half of my work on this problem is correct, but I got less than half credit.”  Grades are terribly important to most students, so when they object to a grade, they often do so with passion.  For most professors, discussing contested grades is not a favorite conversation.  Often, it doesn't end well.  The grade can't be changed, and the student can't be persuaded.  However,…