- Discussion_board_for_lectures
- discussion_board_for_assignment
- student
- ta
- grader
- teacher
- user_type
- course_category
- course_details
- course_term
- course_creator
- course_offering
- course_involvement
- student_course_details
- ta_related_to_course
- graders_related_to_course
- teachers related_to_course
- assignment_submission
- rating
- grading
- student_grading