There are three semesters a year: Fall, Spring, and Summer. Admitted students may register for all the classes they wish to take during any term of a single semester, providing the classes have not yet started. For example during the first registration period of Spring Semester, you may register for your Spring I, Spring II, and, if available in your area, Spring III Term classes all at the same time. All the classes that you register for will be billed on the next billing cycle.