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 Roobrix is a tool that helps teachers avoid grading errors when scoring rubrics.  When creating a rubric the lowest level should be minimum expectations, not a zero.  Yet when we mark rubrics, the minimum level is 1 out of 4 so the student fails with 25% instead of getting a 50% for minimum work.  So instead of failing, the student gets minimum marks.  Go to this link to understand more fully. helps you to calculate a rubric more thoroughly, and with more precision.  Plug in the numbers that you have given the students, and then it gives out the percent mark.  Take a look.