 Proponents of MMR may allow that moral disagreements sometimes are rationally resolved. In particular, they may grant that this often happens when the parties to a moral dispute share a moral framework. The characteristic relativist contention is that a common moral framework is often lacking, especially in moral disagreements between one society and another, and that differences in moral frameworks usually cannot be explained simply by supposing that one society or the other is making factual or logical mistakes. These moral disagreements are ultimately rooted in fundamentally different moral orientations, and there is usually no reason to think these differences result from the fact that, in relevant respects, one side is less reasonable or well-informed than the other. They are faultless disagreements. This conclusion might rest on the observation that it is not evident that mistakes are at the root of these disagreement. But it might also depend on a theory, developed to explain such observations, that the frameworks are incommensurable: They do not have enough in common, in terms of either shared concepts or shared standards, to resolve their differences, and there is no impartial third standpoint, accessible to any reasonable and well-informed person, that could be invoked to resolve the conflict.