Viva voce
Viva voce means with living voice: in other words, an interview. This should take place after the final draft has been submitted. I always feel that by this time everything that should be said has been said, so it's just a final meeting to reflect on the process. One of the reasons for having the interview is so that you are sure the essay is the work of the student. However if you have any doubts, then these should...