  One scientific naturalist argument for hedonism is this: in the value domain we should be scientific naturalists in our methods of inquiry; hedonism is the best option in respect of scientific naturalism; therefore, we should be hedonists about value. Various issues arise. Both premises of the argument need support. First, what are scientific naturalist forms of inquiry into value, and why think they should be adopted them in the value domain? One broadly scientific rationale for adopting such methods is the claim that their empirical track record is superior to that of philosophical theorising about value. But the thesis that naturalistic methods have a superior empirical track record or prospect is not obviously true and needs argument. A case also needs to be made that hedonism does do better than its rivals in the scientific naturalist respect. Why think it has better naturalistic credentials, for example, than the numerous non-hedonic and extra-hedonic mental states and properties, and the various forms of agency and of personal relationship, that are amongst the promising rival or additional candidates for non-instrumental value status?