 The Realists also take the second step that Quine takes: replacement. According to the Realist indeterminacy thesis, legal reasons do not justify a unique decision, meaning that the foundationalist enterprise of theory of adjudication is impossible. Why not replace, then, the “sterile” foundational program of justifying some unique legal outcome on the basis of the applicable legal reasons with a descriptive/explanatory account of what input (i.e., what combination of facts and reasons) produces what output (i.e., what judicial decision)? As Underhill Moore puts it at the beginning of one of his articles: “This study lies within the province of jurisprudence. It also lies within the field of behavioristic psychology. It places the province within the field” (Moore &amp; Callahan 1943, p. 1). Notice how closely this echoes Quine’s idea that, “Epistemology…simply falls into place as a chapter of psychology…” (1969, p. 82). Jurisprudence—or, more precisely, the theory of adjudication—is “naturalized” because it falls into place, for the Realist, as a chapter of psychology (or economics or sociology, etc.). Moreover, it does so for essentially Quinean reasons: because the foundational account of adjudication is a failure—a consequence of accepting the Realists’ famous claim that the law is indeterminate.