 M-naturalists, then, construct philosophical theories that are continuous with the sciences either in virtue of their dependence upon the actual results of scientific method in different domains or in virtue of their employment and emulation of distinctively scientific ways of looking at and explaining things. We may still distinguish between two different branches of M-naturalism, represented best by Quine, on the hand, and Goldman, on the other. The former we will call Replacement Naturalism, the latter Normative Naturalism. Goldman’s paradigm of Normative Naturalism has dominated research in philosophy (see Kitcher 1992), though it is Quine’s notion of Replacement Naturalism that proves useful for understanding the American Legal Realists as naturalists in legal philosophy (Leiter 1997). Since both Replacement and Normative Naturalists share the methodological commitment distinctive of naturalism—to make philosophical theorizing continuous with and dependent upon scientific theorizing—the difference must be located elsewhere: not in methodology, but in goal. According to Replacement Naturalists, the goal of theorizing is description or explanation; to that end, conceptual and justificatory theories are to be replaced by empirical and descriptive theories. According to Normative Naturalists, the goal is regulation of practice through the promulgation of norms or standards. Of course, traditional epistemology also shares the regulative goal of Normative Naturalism; what distinguishes the Normative Naturalist is simply the methods employed to realize this objective (cf. Goldman 1986, pp. 6–9).