Book excerpt: Peter Hanks defends a new theory about the nature of propositional content. According to this theory, the basic bearers of representational properties are particular mental or spoken actions. Propositions are types of these actions, which we use to classify and individuate our attitudes and speech acts. Hanks abandons several key features of the traditional Fregean conception of propositional content, including the idea that propositions are the primary bearers of truth-conditions, the distinction between content and force, and the concept of entertainment. The main difficulty for this traditional conception is the problem of the unity of the proposition, the problem of explaining how propositions have truth conditions and other representational properties. The new theory developed here, in its place, explains the unity of propositions and provides new solutions to a long list of puzzles and problems in philosophy of language.