Toward the end of PoliticsV. 12, Aristotle criticizes Plato’s discussion of political change in RepublicVIII-IX. Scholars often reject Aristotle’s criticism, especially because it portrays Plato’s discussion, allegedly unfairly, as developing a historically testable theory. I argue that Aristotle’s criticism is adequate, and that the seriousness with which he considers Plato’s account of political change as an alternative to his own is both warranted and instructive. First, apart from criticizing Plato’s account for its historical inaccuracies, Aristotle also exposes theoretical insufficiencies and internal inconsistencies within it. Second, Aristotle’s criticisms of historical inaccuracies in Plato’s discussion of political change are not misdirected, since there are reasons to think that Plato does intend that discussion to accord with the historical facts.