Setup Login as admin. Go to "Site administration | Grades | General settings" and make sure the " Recover grades default " is unchecked. Create a course Go to the Participants page and enrol at two users (user1 and user2). Add an assignment to the course. Go to the assignment's grading table and enable quick grading. Give grades to user 1 and 2 Click " Grades " on the nav panel to go to the Gradebook. Confirm  that user1's and user2's assignments have been graded. Testing scenario 1 Login as admin. Access to the Participants page of the course. Unenrol the user1 from the course. Enrol again the user1. During the enrolment click over the "Show more" link and: Confirm that "Recover user's old grades if possible" is unchecked Go to the Gradebook. Confirm that user1's assignment  doesn't have a grade. Testing scenario 2 Gi to "Site administration | Grades | General settings" and enable the " Recover grades default " setting. Access to the  Participants  page of the course. Unenrol the user2 from the course. Enrol again the user2. During the enrolment click over the "Show more" link and: Confirm that "Recover user's old grades if possible" is already checked Go to the Gradebook Confirm that user2's assignment has a grade and is the same as the previously given grade. Go back to the  Participants  page of the course. Unenrol the user2 from the course. Enrol user2 again. During the enrolment click "Show more" link and uncheck the Recover grades checkbox. Go to the Gradebook Confirm that user2's assignment doesn't have a grade.