 The noncognitivist and the error theorist, it should be noted, count as neither moral naturalists nor moral non-naturalists, since they do not believe in moral facts at all. These kinds of moral anti-realist, however, may well be naturalists in a more general sense: they may maintain that the only items that we should admit into our ontology are those that fit within the scientific worldview. Indeed, it is quite likely that it is their commitment to this more general ontological naturalism that lies behind the noncognitivist’s and the error theorist’s moral skepticism, since they may deem that moral properties (were they to exist) would have to have characteristics that cannot be accommodated within a naturalistic framework.