1- 99: Courses which carry no-credit toward a degree or a credential. 100-199: Lower-division courses designed as freshman level, but also open to other students. 200-299: Lower-division courses designed as sophomore level, but also open to other students. 300-399: Upper-division courses designed as junior level; may be opened to “advanced” lower division students under special circumstances with prior approval. 400-499: Upper-division courses designed as senior level not open to lower division students and may be used for post-baccalaureate or graduate credit with prior approval.