The University has adopted a policy for the selection, training and support of Postgraduates Who Teach (PGWTs). You can find it here: http://www.york.ac.uk/admin/hr/resources/policy/postgraduates-who-teach.htm
Students who began their degree programme before October 2011 should consult the MA Handbook 2010-11 (listed above) for information on assessements.
(Departmental Colloquia events take place on Wednesdays and start at 4.30pm in the Philosophy Department, Seminar room SB/A009 unless otherwise stated)