Is there a way to only allow one submission for assignments?
Hi Deborah. There currently is no way to limit students to one assignment submission. However, within the SpeedGrader interface you can always see the submission history with time stamps (How do I use SpeedGrader?). This allows an instructor to determine if the first submission is graded, the most recent submission before the deadline, or any submission thereafter. After the due date, you can close access to an assignment so late work is not possible (see availability dates in How do I add or edit details in an assignment?) .
I hope this helps and best wishes!
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