Sandra,
I feel your pain. When I have a paper due (and I have over 200 students sometimes), I'll grade them in parts. I'll grade the abstract, then the introduction, then the body, then the conclusion and references. The separate parts add up to the total grade. I grade more times, but it goes more quickly. And, if I find an issue in one part, they can make it right in the next part. Just a thought.
