 Both of these philosophers develop a ‘two-tiered’ approach to the content of utterances of sentences containing indexicals. “I am sitting” expresses the proposition that Moe is sitting in a context with Moe as speaker, a different proposition, that Curley is sitting, in a context with Curley as speaker. Thus we have two functions involved. The character (Kaplan) or propositional concept (Stalnaker) is a function from contexts to propositions. And, at least within possible worlds semantics, propositions are conceived as functions from worlds to truth-values.