This academic year at the University of Manchester School of Computer Science we ran a five week course to MSC level students with prior CSc degrees. There was one formal and on informal contact day per week, and the students did additional group work. We covered TDD/pair programming/Scrum (two sprints in the latter four weeks), user stories, retrospectives, and velocity/estimation with a heavy emphasis on the formation of self-improving teams. We did assessment largely by test, and a pass/fail on their code and tests (all groups passed). Not my ideal kind of assessment. Regarding all of these I would say the challenge is not so much assessment (which can be difficult) but rather the amount of coaching and feedback involved in producing agile teams that can do high quality work.