 With the exception of sets of probabilities, every model of partial belief that we have seen in this section is a special case of plausibility measures. While it is fairly uncontroversial that partial belief functions should obey Halpern’s plausibility calculus, it is questionable whether his minimal principles capture anything of epistemic interest. The resulting epistemology is, in any case, very thin. It should be noted, though, that Halpern does not intend plausibility measures to provide a complete epistemology, but rather a general framework to study more specific accounts.