Parts (b):
Part (c). I misspoke and said "in parallel" when I meant "in sequence", near the end. Also the video ends part way through the last sentence when my camera ran out of memory - it should say "because no info about paying in Q" or similar.
Part (b)
A question about this came up at a tutorial. Strictly speaking, in today's UML, the way this video treats some of its transitions isn't quite correct. For the 2015 exams, however, it would be acceptable. Here are the gory details for anyone interested or bothered.
Part (c)
Part (b). This video shows me dithering slightly about whether the drinks can object gets newly created or found from somewhere; sorry about that.
Part (c)
Part (c)
Part (d)
Couple of points I noticed afterwards:
perdita@inf.ed.ac.uk
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