 This second conception of value incommensurability denies what Henry Richardson calls “strong commensurability” (1994, 104–105). Strong commensurability is the thesis that there is a true ranking of the realization of one value against the realization of the other value in terms of one common value across all conflicts of value. A denial of such a singular common value, however, does not rule out what Richardson calls “weak commensurability” (1994, 105). Weak commensurability is the thesis that in any given conflict of values, there is a true ranking of the realization of one value against the realization of the other value in terms of some value. This value may be one of the values in question or some independent value. This value also may differ across value conflicts. The denial of strong commensurability does not entail a denial of weak commensurability. Even if there is no systematic or general way to resolve any given conflict of values, there may be some value in virtue of which the realization of one value ranks against realization of the other. Donald Regan defends the thesis of strong commensurability (Regan 1997).