 The lessons from Arrow’s theorem depend, in part, on how we interpret an Arrovian social welfare function. The use of ordinal preferences as the ‘aggreganda’ may be easier to justify if we interpret the aggregation rule as a voting method than if we interpret it as a social evaluation method. Sen argued that when a social planner seeks to rank different social alternatives in an order of social desirability (thereby employing some aggregation rule as a social evaluation method), it may be justifiable and even necessary to use additional information over and above ordinal preferences, such as interpersonally comparable welfare measurements (e.g., Sen 1982) or information about people’s capabilities to achieve valuable functionings (e.g., Sen 1992).