Proponents of human nature perfectionism must defend an account of human nature. More precisely, they must give an account of the properties or capacities that are central to human nature and the development of which have value (Hurka 1993). By contrast, proponents of objective goods perfectionism must explain why some goods, and not others, are included. Objective goods perfectionists need not formulate an exhaustive list of objective goods. They may believe such an undertaking to be misguided. But they should have something to say about what makes an alleged good an objective good, one worthy of pursuit (Sumner 1996; Sher 1997).