  The debate between moral realists and anti-realists assumes, though, that there is a shared object of inquiry—in this case, a range of claims all involved are willing to recognize as moral claims—about which two questions can be raised and answered: Do these claims purport to report facts in light of which they are true or false? Are some of them true? Moral realists answer ‘yes’ to both, non-cognitivists answer ‘no’ to the first (and, by default, ‘no’ to the second) while error theorists answer ‘yes’ to the first and ‘no’ to the second. (With the introduction of “minimalism” about truth and facts, things become a bit more complicated. See the section on semantics, below.) To note that some other, non-moral, claims do not (or do) purport to report facts or that none (or some) of them are true, is to change the subject. That said, it is strikingly hard to nail down with any accuracy just which claims count as moral and so are at issue in the debate. For the most part, those concerned with whether moral realism is true are forced to work back and forth between an intuitive grasp of which claims are at issue and an articulate but controversial account of what they have in common such that realism either is, or is not, defensible about them.