Shows how the degree of confidence that information from multiple sources is a function of the plausibility and the coherence of the information as well as of the reliability of the sources. There is a long-standing question in epistemology about how to construct a measure that yields a coherence ordering over sets of propositions and there are various proposals in the literature. Presents an impossibility result to the effect that there cannot exist such a measure. This has implications for the coherence theory of justification.
Keywords: Bayesian coherentism, coherence measures, coherence theory of justification, coherence, impossibility theorem, information, plausibility, reliability