I was thinking along the lines that, say you have some short questions like, for example, "translate these sentences into French". You could have maybe 5 marks per sentence, of which 2 marks go to expressing the meaning of the sentence correctly, and 3 marks go to spelling, grammar, and the like. Is that how it would work? For shorter things like that, I can see percentage grading working just fine. For longer works like essays, though, would it not become more difficult to grade them so precisely? There isn't really any one single correct answer, so the marking scheme would need to be more broad, more generalised, and it would be harder to assign precise scores to the works, no? Maybe it just depends on what the total marks are broken up into, like you said, which probably ties into what exactly the question is looking for (so, how well you stick to answering the question, and not getting too far off topic, might be worth a certain amount, spelling and grammar is worth another certain amount, and so on. I understand that length isn't usually a factor, that was just to give a sort of example of what I meant. Guess it didn't come across so well.).