 On the other hand, some philosophers—externalists of various stripes, for instance—may find fault with the epistemological presuppositions underlying Harman’s conception of a theory of reasoning. Harman views the aim of epistemology as closely linked to his project of providing a theory of reasoning. According to Harman’s “general conservatism”, central epistemological notions, like that of justification are approached from the first-personal standpoint: “general conservatism is a methodological principle, offering methodological advice of a sort a person can take” (Harman 2010: 154). As such Harman's approach contrasts with much of contemporary epistemology which, unconcerned with direct epistemic advice, is mainly in the business of seeking to lay down explanatorily illuminating necessary and sufficient conditions for epistemic  justification.[12]  Summarizing the first line of response, then, Harman's skepticism is partly premised on particular conceptions of logic and of epistemological methodology both of which may be called into question.