Grading concerns various questions regarding the assignment of grades to course work
The grading tag concerns different problems associated with grading course work. Grading involves how to assess work performed and how to provide objective/fair measures of a student's ability to fulfill requirements in a course context. The tag can be used for questions regarding the use of different assessment systems, problems when setting grades etc.
The tag should not be used when discussing grades, for example comparisons between different grade systems (between countries etc). Then the grades tag should be used.