This essay writing assignment forces the students to revise their writing. They must keep resubmitting the essay until it has only a few minor errors.

That might sound like a lot of grading, but it really isn't. You only grade until you see a few errors, and then you stop and return it to the student for revision.

I've used this assignment for years, and it really drives home for the students the importance of carefully proofreading what they turn in.

I use it as an exam grade, but you can modify it to fit your needs.