In Workshop, I have several students who correctly gave low scores to other students with poor work. Mostly, I had each student grade three other students, due to information from hours, days, weeks and months of searching in Moodle, eventually to find that's what Moodle demands in order to calculate an assessment grade. So, within each correct student's set of co-graders, the other two graders graded higher, but not as well. But the incorrect graders' scores clustered together, such that whatver Moodle is doing with these grades, the correct grader was outdistanced, and got a harsh 'grading grade'. Due to the extreme difficulty of finding answers, and the trial and error nature of implementing Workshop, I am now resorting to additional trial and error, to add my own assessment, give it a substantial weight, such as 8 or 12, making me equivalent to 8 or 12 persons! And/or overriding the assessment grade, such that the resulting grading grade is incorrect for the criteria, but such that the correct student grader's assessment grade is near to the an appropriate numeric value. I have NOT yet tried to override the poor graders' assessment grades downward, because there are more of them, and I would be incoherrent in a court of law, trying to explain how these grades were determined by Moodle. Actually, I would be able to explain what I did, but I doubt that irate students and/or their parents and lawyers would acquiesce.
At this point in time, I have 2/19 students with this issue. One of those had an additional issue, with correct grading of one Aspect of the assignment, but incorrectly harsh grading of the other Aspect of the assignment. So I had lots of trial and error, added my own assessment, and overweighted my own assessment, until the harsly graded student's grade came up to a better numerical value.
Hmm, have there been any law suits involving faculty, universities, and Moodle due to Moodle computation of Workshop assessment grades? Is there any specification, algorithm, or, in my words, formula or set of formulas, since 2009, for Moodle 2.4.4?