 Both assertions and questions can then be taken to have the potential to change the context in which they are uttered. Assertions restrict the context set \(C\) to those worlds in which the asserted sentence is true (strictly speaking, they remove all pairs of worlds \(\langle w,v\rangle\) from \(R\) such that the asserted sentence is false in at least one of the two worlds). Questions disconnect worlds, i.e., they remove a pair \(\langle w,v\rangle\) from \(R\) just in case the true exhaustive answer to the question in \(w\) differs from the true exhaustive answer to the question in \(v\).