 Considering a similar problem, Quine and Ullian (1970) enunciated the principle of “conservatism,” conseling that our new beliefs “may have to conflict with some of our previous beliefs; but the fewer the better.” In his (1990), Quine dubs this the “maxim of minimal mutilation.” Inspired by these suggestive principles, Alchourrón, Gärdenfors, and Makinson (1985) developed a highly influential theory of belief revision, known thereafter as AGM theory, after its three originators. 