 Nevertheless, in certain circumstances different users may be expected to come to assign similar or even identical quantum states by updating their prior credences to take account of common (though never identical) experiences, some of which each may describe as experiences of the outcomes of quantum measurements on systems. Because QBists take the quantum state to have the role of representing an agent’s epistemic state they may avail themselves of personalist Bayesian arguments purporting to show the convergence of priors on updating in the light of common information. Also, just as de Finetti showed that a subjectivist agent’s credences may evolve as if refining estimates of an unknown objective probability, QBists (Caves, Fuchs, and Schack 2002b) have shown that the credences of a user of quantum theory may evolve as if refining his or her assignment of an unknown objective quantum state.