Every deadline session has 3 dates

There are two kinds of session: attendance only, and deadline. A deadline session has associated with it some work which students have to complete and get marked. These deadline sessions each have 3 dates:

• The (unextended) deadline: this is always the end of the session.

• The extended deadline: this is normally the start of the following session, although it can sometimes be the start of a later session. But it is always the start of a session, to allow work completed by it to be marked in that session. Students have a right to obtain the extension from the deadline to the extended deadline, without penalty.

• The excuse expiry: for special circumstances, a student may be given an excuse for not meeting the extended deadline. There are two kinds of excuse: expiring and non-expiring. Supervisors can only award expiring excuses. The date of expiry is normally the start of the session following the extended deadline: this date is printed near the top of the sheet.

So for example, for a typical fortnightly laboratory in week B, the deadline in week 2 can be extended to the next session in week 4, and an excuse for good reason may be awarded by you to further extend this to the next session in week 6.

As an exception, excuses you award for the last real session (i.e. the one before the Marking session) are non-expiring.