 McGrew (1995, 1999) argues that a kind of certainty or infallibility (in his terms, “incorrigibility”) is a necessary feature of empirical foundational beliefs: a belief that P is empirically foundational only if being justified in believing that P guarantees its truth. He defends the view that such foundations are available and that they are adequate to yield knowledge of the external world. Other classical foundationalists want to allow for the possibility of false foundational beliefs. (See Fumerton 1995: 77; BonJour 2003: 73–74; and Fales 1996: 174–80. For a critique of acquaintance theorists’ attempts to accommodate fallibility at the foundations, see Huemer 2007, Poston 2010, and Tucker 2016. For replies to some of these critiques, see Fumerton 2010 and 2016, Hasan 2013, and Stoutenburg (forthcoming). Stoutenburg nevertheless motivates infalliblism, and provides an account of how propositions that moderate foundationalists regard as basic derive their justification from infallibly known propositions.)