My son is a graduate student in civil engineering. He is being paid to get his degree as he has a graduate assistanceship. These folks teach labs, lower level courses, and grade papers for professors. Today, he was telling me how much he enjoys grading papers and giving feedback. He also likes to catch the cheaters. He had two guys who turned in identical papers.He held them up to the light and fitted one over the other. They had made identical copies from the computer. I thought his way of grading was good. He gave each boy 50%.