This is reviving quite a few suggestions, including Grades - Filter or Sort Students by Groups, Add "Groups" filtering feature to Assignments/Grading, and Gradebook Smart View by Group.
We need a way to filter the gradebook using student groups. Right now, the gradebook can only be filtered by sections within a course. There are quite a few use cases for requesting this functionality:
1. We have several large classes where the TAs are responsible for grading a subsection of a section within a course. This becomes tedious, because the filtering options for the gradebook limit this by section only. So if they have a section of 40 students but are only responsible for grading 20 of those, they need to create a section to filter the gradebook. This becomes troublesome when there are 400+ students in the course since creating sections requires the manual work of clicking on each student to change their associated sections. Even with section-anonymity turned on, this is still 60+ clicks for one subsection of 20 students.
2. We have several programs that use outside folks as facilitators who grade/interact with students. We set-up student groups for these folks so they can communicate with just their group of students. It would be nice to filter the gradebook of these groups instead of writing the facilitator's name in the Notes column or manually creating sections for the groups.
3. Some of our courses have several different groups in them for various purposes (different projects, in-class groups, etc). In general, it would be nice if instructors could filter off these groups to compare student performance and involvement.
As a final note, the drag-and-drop functionality of Groups is much easier to use than the manual process of creating sections. While manageable for small numbers, it's simply too much to handle for large courses.