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Belief revision and belief update have heen proposed as two types of belief change serving different purposes, revision intended to capture changes in belief state reflecting new information about a static world, and update intended to capture changes of belief in response to a changing world. We argue that routine belief change involves elements of both and present a model of generalized update that allows updates in response to external changes to inform an agent about its prior beliefs. Thisdoi:10.1016/s0004-3702(97)00066-0 fatcat:5vmau75jarhpffrhxyqte47yx4