 Epistemic conservatism is a methodological norm that has been prominent in philosophy at least since Quine’s notion of “minimal mutilation” of our beliefs [1951]. One version of epistemic conservatism, as we saw above, holds that inquiry should seek stable belief. Another formulation, closer to Quine’s, is the general precept that belief changes in light of new evidence should be minimal. Fairly recent work in philosophical logic has proposed a number of criteria for minimal belief change known as the AGM axioms [Gärdenfors 1988]. Learning theorists have shown that whenever there is a reliable method for investigating an empirical question, there is one that proceeds via minimal changes (as defined by the AGM postulates). The properties of reliable inquiry with minimal belief changes are investigated in [Martin and Osherson 1998, Kelly 1999, Baltag et al. 2011, Baltag et al. 2015].