Abstract
Blockage revision is a version of descriptor revision, i.e. belief change in which a belief set K is changed with inputs whose success conditions are metalinguistic expressions containing the belief predicate $$\mathfrak {B}$$B. This is a highly general framework that allows a single revision operator $$\circ $$? to take inputs corresponding to sentential revision ($$K\circ \mathfrak {B}p$$K?Bp), contraction ($$K\circ \lnot \mathfrak {B}p$$K??Bp) as well as more complex and composite operations. In blockage revision, such an operation is based on a relation $$\rightharpoondown $$? of blockage among the set of potential outcomes. $$X\rightharpoondown Y$$X?Y signifies that if X satisfies the success condition of a belief change, then Y cannot be its outcome. The properties of blockage revision are investigated, and conditions on the blocking relation are specified that characterize various properties of the resulting operation of change.
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