Students who are unable to be present should be in touch with the instructor in advance to see whether he or she will hold their places. Instructors are not, however, required to hold places or to admit students at the door. Permission will be granted only in cases of genuine hardship and provided the extension of the cap does not exceed four. The student must demonstrate that the course is needed to fulfill a degree or major requirement for which there is no alternative in the same or a different department, and that the course or its alternative cannot be taken in a different term or in a later year. Courses are normally capped at 25.
Some courses have lower caps.
A list of such courses is available from the Registrar's Office.