A student must have certain documentable skills and/or knowledge before entering the course. This knowledge is considered necessary for a student to succeed in the course.
A certain preparation is recommended before a student enters the course. The preparation is considered advantageous for a student to succeed in the course. Since the preparation is recommended, the student is advised, but not required, to meet the condition before or in conjunction with enrollment in the course or educational program.
A student must take another specific course concurrently with the course for which it is required. In some cases, the corequisite course may be taken prior to the course for which it is required - however, in these instances the corequisite course must be completed with a grade of C or higher..