 The prescriptive issue mentioned above raises some other questions. There is an empirical, computational question: What is the extent to which a human brain can approximate the Bayesian ideal of synchronic and diachronic coherence? See Griffiths, Kemp, &amp; Tenenbaum (2008) for a survey of some recent results. And there are philosophical questions: Why is it epistemically better for a human’s credences to be less incoherent? Speaking of being less incoherent, how can we develop a measure of degrees of incoherence? See de Bona &amp; Staffel (2018) and Staffel (2019) for proposals.