The instructor teaches a CS course and overlooks students' and TAs' activities. He/She is a regular user of the software. I.e. once the instructor is familiar with the software, it should be very easy for him/her to recall this knowledge. The application supports the instructor in marking course-work - usually conveyed by TAs - and grading the course which he/she teaches. In contrast to Students (only view privileges) and TAs (restricted write privileges), an instructor has unrestricted privileges (Superuser).
Note: It is particularly important that an instructor can easily transfer configuration settings and data from one course to another (new) course.