 On the method approach, by contrast, there is no need for a master principle that will serve as the basis for deriving some particular moral rules. The idea here is the natural law theorist needs not a master rule but a test for distinguishing correct moral rules from incorrect ones. We know from our earlier consideration of the paradigmatic natural law view that the test for distinguishing correct moral rules from incorrect ones must be something like the following: if a moral rule rules out certain choices as defective that are in fact defective, and rules out no choices as defective that are not in fact defective, then it is a correct moral rule. What would distinguish different employments of the method approach is their accounts of what features of a choice we appeal to in order to determine whether it is defective. The knowledge that we have to go on here is our knowledge of the basic goods. If a certain choice presupposes something false about the basic goods, then it responds defectively to them. So a moral rule can be justified by showing that it rules out only choices that presuppose something false about the basic goods.