 The coherence theory of justification represents an initially suggestive solution to some deeply rooted problems of epistemology. Perhaps most significantly, it suggests a way of thinking about epistemic justification as arising in a “web of belief”. As such, it competes with, and could potentially replace, the historically dominating, but increasingly disreputable, foundationalist picture of knowledge as resting on a secure base of indubitable fact. Coherentism may also be more promising than alternative foundationalist views with their reliance on non-doxastic support. Unfortunately, coherence theorists have generally struggled to provide the details necessary for their theory to advance beyond the metaphorical stage, something which has not gone unnoticed by their critics. Following the seminal work of C. I. Lewis, contemporary scholars have taken on that challenge with considerable success in terms of clarity and established results, although a fair number of the latter are to the coherentist’s disadvantage. Some results support a weak foundationalist theory according to which coherence can boost credibility that is already there, without creating it from scratch. However, on the face of it, the impossibility results negatively affect this less radical form of coherence theory as well. It is often observed that while it is relatively easy to put forward a convincing theory in the outline, the ultimate test for any philosophical endeavor is whether the product will survive detailed specification (the devil is in the details, and so on). What the recent developments in this area have shown, if nothing else, is that this is very much true for the coherence theory of epistemic justification.