Enable grade penalty Go to Grades > General settings in site administration Enable Grade penalty (gradepenalty_enabled) Go to Grades > Grade penalty > Manage penalty plugins in site administration Click on 'toggle' button to enable 'Late submission penalties' plugin Go to Grade penalties > Supported modules Click to select "Assignment" Save changes Go to Grade penalties > Late submission penalties > Mange penalty rules: Create some penalty rules   Create an assignment with penalty : Create a test course Create an assignment in the course: Set due date to "Yesterday" / a date in the past Make sure grade type is set to point Enable "Grade penalties" Enrol a student to the course Login as the student Add an submission Log in as an teacher to mark the submission Expected: The grade in grade book is deducted according to the penalty rules (set up in set 4.1 - Enable grade penalty) As the teacher, go back to Assignment setting Choose "Yes" in "Recalculate penalty" drop box Then change the due date Go to "View all submisisons" page: Expected: the final grade is re-calculated according to the new due date Repeat the test with "user override" and "group override", we should have the same behavior.