 Kuhn’s insightful treatment of science from the working scientists’ point of view provided a microlevel conception of rational decision-making. But did he have a metamethodological account of how to decide among competing theories of scientific rationality? Again, not an explicit and comprehensive account, only some constructive suggestions. Like all historicists, he said that a rationality theory must fit the history of science and that the traditional accounts failed this history test. An adequate theory must also be progressive and avoid epistemological relativism. Kuhn (and many others) simply built in these norms from the outset. Such a move works well among most friends of historicism but not well for critics, who think these presuppositions simply beg the normativity of history question. Given incommensurability, are not rationality, progressiveness, and denial of relativism key items that must be argued for? In other passages, Kuhn did argue for them, but few critics were convinced.