Courses taught at non-standard times and on irregular day patterns should be kept to a minimum, and will receive the lowest priority in the classroom assignment process. Scheduled classes that cross into multiple time blocks should be arranged to have the least impact and affect the least amount of time blocks. Not only do non-standard times affect the availability of rooms but they also affect the students who can enroll in them. Once non-standard classes are scheduled, they cannot be moved to accommodate higher enrollments or media needs.