 A second strategy would be to revise the theory in order to include general intelligence as a central element. This should not have to be problematic since Lewis’s theory is meant as an idealization. As Lewis notes, general intelligence is already needed to deal with vagueness, indexicality, and other phenomena. Nor would Lewis be alone in claiming this. Some have claimed that “pragmatic determinants of what is said” are at work in every single utterance. (For more on this same theme, see the entries on  pragmatics  and  defaults in semantics and pragmatics.)