Literature question: is there anything out there about epistemic constraints on, or an epistemic rationale for, the use of Jeffrey conditioning? Dick Jeffrey was, himself, a radical personalist, so he had little to say about the conditions under which it might be rational to update via his famous formula. But plenty of non-personalists are interested in questions about conditionalization. I’m familiar with, e.g., Kyburg, Thalos and Bacchus’s article “Against Conditionalization,” but I’m looking for something with a positive moral as well as purely critical literature. There are some interesting considerations that I would like to see taken into account; but why reinvent the wheel if it’s rolling around out there somewhere? Feel free to offer pointers, particularly to any articles on the rigidity of likelihoods in conditionalization.