Classes meeting in three-hour time block, such as night classes, may be added as long as the student is able to attend the second meeting of the class. This term is used to indicate that, in order to take particular courses, another course must have been taken previously. The required first course is referred to as the prerequisite. This involves filling out certain forms in the Registrar's Office and counseling with an adviser as to the course of study. Northern offers pre- enrollment for the following semester several weeks before the end of the current one.
Early enrollment is advisable to avoid enrolling in a class that has been filled to capacity.
A class closes when the maximum class size is reached. The term staff is used in semester course schedules- to indicate that an undesignated instructor will teach the course. Frequently an instructor is not assigned to a course until the total enrollment is completed. To withdraw from all courses a student must go to the Registrar's Office and formally withdraw from all courses. Simply to stop attending classes does not constitute withdrawal.