1-99: Course not applicable for credit toward a bachelor's degree. 100-199: Initial or introductory courses. 200-299: Second-year courses in a sequence or development in a field of study. 200-level courses that have an explicit college-level course prerequisite count toward the non-introductory credit requirement. 300-499: Third- and fourth-year courses in a sequence of courses or first courses in professional curricula. May be accepted by Graduate Division to fulfill graduate degree requirements. Course numbered 300 or above are upper-division and count toward the non-introductory credit requirement.