If I have 75 students and I spend 25 hours a week grading, that is 20 minutes per student. A grader would net me 20 hours a week for research and writing.
You see why people have things machine graded. You see also why the instructors, who teach up to 7 courses which means over 200 students, use the test banks and the autograde function.
Axé.
coldhearted scientist وداد 