 The key challenge for the grading-based approach to social choice is to ensure that the grades have a common meaning for all voters. Unless an ‘A’-grade, for instance, has the same meaning for all voters, the entire exercise of aggregating individually assigned grades would not be meaningful. Some voters might be tougher graders than others, and it will then not be possible to infer that an ‘A’-grade from one voter is a stronger quality signal than a ‘B’-grade from another. Just as Sen’s SWFL approach avoids the impossibility results of social choice only if we can assume interpersonal comparability of welfare, so the grading-based approach allows us to make meaningful social choices only if grades are interpersonally comparable in an appropriate sense. For a technical development of this critique of the grading-based approach, see Morreau (2016).