When creating an assignment, you can choose to set up an assignment with moderated grading, which allows multiple reviewers to grade a student’s work and create draft or provisional grades. Moderated grading is enabled on a per-assignment basis.
Once you publish the assignment you can add students to the assignment moderation set.
Select Moderated Grading
Click the Allow a moderator to review multiple independent grades for selected submissions checkbox.
If you want to notify users about any future assignment changes, click the Notify users that this content has changed checkbox . Click the Save button .
Note: If your assignment has not yet been published, the assignment will show the Save & Publish button. The Save button will create a draft of your assignment so you can publish it later. Once you publish the assignment you can add students to the assignment moderation set.