  Another realist reply to the epistemic challenge is to argue that mathematics and logic, not science, are the right models of moral theory (Scanlon 2014). Neither mathematics nor logic, some maintain, rely on experience for their confirmation. They are, instead, supportable a priori by appeal to the nature of the concepts they involve. On this view, a sound defense of the principles we need to ground moral arguments can be found in a suitably subtle and careful bit of conceptual analysis. In light of Moore’s Open Question Argument, those who advocate an epistemology of conceptual analysis acknowledge that the correct analysis, whatever it is, is likely not at all obvious. And, they point out, this means that people who are genuinely competent with the relevant concepts might themselves not recognize the correct analysis as correct (Jackson 1998). Nonetheless, the analysis might be correct. If there is some such analysis to be had, and if it is rich enough to provide the sort of substantive principles needed to underwrite our various particular judgments, realism will have met well its epistemic burden. Of course putting things this way assumes we have a good epistemology of conceptual analysis, which might well be called into question. But worries about conceptual analysis are not specific to morality. And if they prove decisive, then those worries leave mathematics and logic, no less than morals, in need of some grounding or other. Whatever might be advanced on behalf of mathematics and logic, many think, should work as well for morality.