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We now change so that minfraction is -6 and maxfraction is 3, so getting the question right a low certainty gives maxmark marks, and you get a bonus for being more confident (rather than being penalised for being unconfident). Mathematically it is the same, but the difference is importnat psychologically. We also change how partially correct scores are handled. It is too harsh to penalise a partially correct score with full certainty by doing a linear interpolation between -6 and +3. Instead, any partially correct score (e.g. 0.5) becomes that fraction of the correct score (e.g. 0.5 * 3 = 1.5). Also, any incorrect score is treated as 0, so if you have a multiple choice question that normally gives a negative score for a wrong choice, this will now never give a score of less than -6. Finally we change how this is displayed to students beside the question. Rather than saying "Marked out of 1.00", we say "Base mark 1.00", and then later we say "CBM mark 3.00" (or whatever it is).