The reason the former scheme is used (first character which isn't already used, rather than alphabetical order) is because if there are more than 26 test categories then we'll run out of characters. I would say change the test results viewing to use the former scheme.
The reason the former scheme is used (first character which isn't already used, rather than alphabetical order) is because if there are more than 26 test categories then we'll run out of characters. I would say change the test results viewing to use the former scheme.