 Even with the metaphysical premise  (1)  removed, a purely epistemological version of PEW, consisting of  (2)  through  (4),  still challenges the justification of our perceptual beliefs. A satisfying solution to the problem of the external world requires the articulation of some plausible epistemic principles, one that explains which of the two crucial premises  (2)  and  (3)  of PEW are being rejected, and provides an epistemological context which renders that rejection plausible. An entirely metaphysical solution to the problem of the external world will not suffice. An epistemological solution to this epistemological problem will be needed in addition or instead.