You can create a graded discussion for a course group by using the Group Discussion checkbox. Canvas uses group sets to assign group discussions, and each group within the group set that is assigned to the discussion is required to complete the discussion.
You will need to assign a group set as part of the discussion. You can add an existing group set, or you can create a new group set as part of the assignment and add students to groups later. However, if you create a group set with self sign-up or manual group assignments, you will not be able to use the group set until users have been added to the subgroups.
When differentiating groups in graded discussions, students can only view the discussion if they are a member of an assigned group. Otherwise the discussion does not appear in the group's discussions page. Grades cannot be assigned for students who have not been included in the graded discussion, and graded discussions that are not assigned to a student are not factored into overall grades.
You can still view the links to all groups that are in the group set (as with any other group discussion). However, if you do not select a group in the differentiated assignments list, the group does not show a differentiated due date.
When Multiple Grading Periods are enabled in a course, graded discussions are also respected against closed grading periods.
Note: Please ensure all students have been added to a group before assigning a group set to the group discussion. If a student is not added to a group and replies to the discussion, the student's reply will be part of the original discussion topic. Replies on the original discussion topic can be viewed by clicking the View the full discussion link in SpeedGrader.