 Yet incorporating self-locating attitudes into decision theory takes a little more work than the “very little” Lewis supposed (as Lewis himself acknowledged in a footnote to his 1996 (n. 6, pp. 309–10)). The trouble comes when we ask how self-locating doxastic states change over time. Formal decision theories have updating rules to manage these transitions. We will focus on how self-locating states interact with Bayesian updating rules (see entry on  Bayesian epistemology);  similar problems arise on other updating formalisms of which we are aware.