Criterion is a writing assessment tool that provides automated feedback on student writing submissions. Several studies found that Criterion helped improve student writing in the following ways: 1) Students who submitted multiple drafts to Criterion had higher average writing scores than those who only submitted one draft. 2) Students with lower initial scores were able to improve their writing to the level of students with higher initial scores by submitting multiple drafts to Criterion. 3) Classes that used Criterion showed greater overall improvements in student writing from first to last drafts, especially when instructors engaged in discussions about how to use Criterion's feedback.