Some courses have designated pre- or co- requisites. A prerequisite is a course that must be successfully completed before a second course may be taken. A corequisite may be taken prior to, or concurrently with, the course for which it is required. For year-long courses and clinics, any pre/corequisite must be completed by the end of the first semester. When registering for a course with a requisite, students must actively ensure that they satisfy the requirement prior to commencement of the course. The electronic registration system will neither register students automatically in pre/corequisite courses nor lock them out of courses for which a prerequisite has not been satisfied. Students who fail to satisfy a prerequisite or pre/corequisite for a course will be required to drop that course. Any prerequisite or pre/corequisite may be waived with permission of the instructor.