I have a problem with grading student talks and submissions based on the popular method of having a list of fixed criteria which give a certain number of points each, which are then added up.
Think something like
completeness 4
correctness 6
slides are pretty 3
time management 3
...
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60 pts
My problem with this approach is summarized best by an old Hagar the Horrible cartoon where they find a castaway guy on a remote island who claims to have survived by eating stones. "Sure, they are very hard to digest, but very easy to catch!"
In other words, if a talk completely sucks in a crucial way, does it make sense to say, sure it's all factually wrong, but the slides are pretty and time management was perfect, so you get a B.
How to solve this? One would need Multipliers instead of just adding points.
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