What exactly are system roles for? Good question! You only really need them for admins (or inspectors maybe) - They are roles than run across the whole of Moodle so say if you had a teacher who taught in every subject area or needed an overview of all; they'd be in there. Or if you had (as we do) a technician who uploads stuff on Moodle for all subject areas so needs access to them all. But 99% of the time you don't need them. Students -and teachers- are assigned simply to the courses in which they are involved,as they don't need to enter the other courses.
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