 Idealization alters citizens’ belief-value sets. A citizen’s belief-value set is the set of all her beliefs, desires, goals, and plans, i.e., everything she thinks and wants. (This idea derives from Bernard Williams’s (1981, 102) conception of a subjective motivational set.) A citizen is idealized when we consider her belief-value set as it might be. Theorists change one or more of her beliefs, desires, and goals according to some criteria. They may imagine her having more or different information or values. Or they must insist on modeling her as fully rational. Both models alter her belief-value set. And the appropriate level of idealization might vary with context. Perhaps it depends on the epistemic quality of reasoning demanded by the situation. (Some reasoning aims to design institutions, whereas one might use other reasoning to plan a family vacation).