Beginning Summer 1988, the course numbering system changed from three-digit course numbers to four-digit course numbers for all campuses except Colorado Springs. Courses since Summer 1988 are numbered 1000-2999 for lower division; 3000-4999 for upper division; 5000-6999 for graduate, master’s level or first and second year professional; and 7000-8999 for graduate, doctoral level or third and fourth year professional. As of fall 2010, all campuses are using the four-digit course numbering standard.