A key aspect of beliefs which is not yet represented in the above models is that they are revisable in the presence of new information. While there is an extensive literature on the theory of belief revision in the “AGM” style (Alchourrón, Gärdenfors, &amp; Makinson 1985), we focus on how to extend an epistemic model with a representation of softer, revisable informational attitudes. The standard approach is to include a plausibility ordering for each agent: a preorder (reflexive and transitive) denoted \(\preceq_i\,\subseteq W\times W\). If \(w\preceq_i v\) we say “player \(i\) considers \(w\) at least as plausible as \(v\).” For an event \(X\subseteq W\), let