 Gärdenfors 1988 advocates this perspective with particular attention to belief revision. Veltman 1985 develops the update view for the treatment of conditionals. One advantage of the idea is that it is possible to show why the mini discourse “It rains. It may not be raining.” is infelicitous in contrast to “It may not be raining. It rains.”. Given that an update is felicitous only to a consistent theory, and that “may \(\phi\)” (with epistemic “may”) simply means “it is consistent” (written \(\diamond\phi\)), the first is the sequence of updates with \(\phi\) and \(\diamond \neg\phi\). The second step leads to inconsistency, since \(\phi\) has already been added. It is vital in this approach that the context is constantly changing.