 Although there is still some controversy concerning the possibility of incommensurable alternatives (compare, for example, Raz 1997 and Regan 1997), there is widespread agreement that we often treat alternatives as incommensurable. Practically speaking, determining the value of two very different alternatives in terms of a common measure, even if this is possible, may be too taxing. It is thus often natural to treat two alternatives as though they are neither equal nor one better than the other.