My overarching purpose is to illustrate the philosophical fruitfulness of expanding epistemology not only laterally across the social space of other epistemic subjects, but at the same time vertically in the temporal dimension. I set about this by first presenting central strands of Michael Williams' diagnostic engagement with scepticism, in which he crucially employs a Default and Challenge model of justification. I then develop three key aspects of Edward Craig's ‘practical explication' of the concept of knowledge so that they may (...) be seen to resonate positively with Williams's epistemological picture: the admixture of internalist and externalist features; the proto-contextualism; and, finally, the distinctively genealogical antisceptical impetus. In this way I aim to support and augment the socialized anti-sceptical case mounted by Williams, and so to show that expanding epistemology in the temporal dimension can be a productive move in central debates in epistemology. Philosophical Papers Vol. 37 (1) 2008: pp. 27-50. (shrink)