Lower-and Upper-Division Courses

All University courses are assigned numbers which designate their general level of difficulty. Courses numbered 10000 to 29900 are lower-division courses and are generally taken by freshmen and sophomores. Courses numbered 30000 to 49009 are upper-division courses and are generally taken by juniors and seniors, usually after they have taken lower-division courses in the department. Upper-division courses often have prerequisites. Courses numbered 50000 and above are graduate level courses and are open to undergraduate students only under special conditions.