Course Numbering Conventions
- 1-99 - Lower division (freshman and sophomore)
- 100-199 - Upper division (junior and senior)
- 200-299 - Graduate-level courses
- 300-399 - Courses for teachers in upper division or postgraduate standing, usually in education, designed to serve needs for professional upgrading, in-service education requirements, basic and specialized credentials.
- 400-499 - Postgraduate courses designed for professional and occupational upgrading and specialization.
- 800-899 - Noncredit programs providing opportunities to pursue intellectual, civic and cultural interests.
- 900-999 - Noncredit bearing units that may offer college prep or secondary school credit.
Letters Preceding Course Numbers
- The letters preceding a course number indicate the University of California campus at which there is an equivalent course. For example, XR denotes Riverside, XL denotes Los Angeles, etc.
- The letter C following any of these designations (e.g. XRC) indicates a concurrent course (campus regular session course in which UCR Extension students may concurrently enroll).
- X alone, or XCal, indicates a course offered only through University Extension. Note, however, that X100 series courses are structured in accordance with requirements for campus upper-division-level courses.
A capital letter after a course number indicates the quarter portion of a course that continues through two or more successive quarters.