They don't have to show you the grading scheme beforehand...I've actually been told outright that that would "defeat the purpose of the assignment"....which I think is total BS. If your entire assignment is based on whether or not I correctly guessed what 5 random points they wanted me to discuss in my 700word summary, AND whether or not I knew ahead of time to completely ignore the instructions they gave us before the assignment, then it's completely worthless anyways.
Afterwards, though, they should be able to tell you where/why you lost marks. I had another prof tell us that he couldn't even give us our homework assignments back, because he needed to keep the documentation to support the grades we got :S
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