Searle refined and systematized Austin's speech act theory, introducing the concept of illocutionary force—the kind of act performed by an utterance (asserting, questioning, commanding, promising). He distinguished between the propositional content (what) and the illocutionary force (what kind of act). Searle argued that speech acts have structural rules and conditions of satisfaction, and that understanding utterances requires grasping their illocutionary force, not just their semantic content.
Study a single sentence with different illocutionary forces ('Close the door!' vs. 'Will you close the door?' vs. 'You will close the door.') to see that propositional content and illocutionary force are independent. Classify speech acts by their conditions of satisfaction.
Illocutionary force is always marked grammatically—many languages perform the same illocution with identical syntax and rely on context. Speech acts are only for performance contexts—all assertion, reference, and predication are speech acts.
From Austin's speech act theory, you know that utterances do things: they assert, promise, warn, declare, apologize. Austin distinguished the locutionary act (saying something with a meaning), the illocutionary act (performing a social action in saying it), and the perlocutionary act (producing an effect on the listener). Searle took this framework and gave it systematic structure — moving from Austin's taxonomy of examples to a theory of what illocutionary acts fundamentally are and how they work.
Searle's central move was to separate propositional content from illocutionary force. Consider three utterances: "You will close the door," "Close the door!" and "Will you close the door?" All three have the same propositional content — they are all about the same state of affairs, namely you closing the door. What differs is the illocutionary force: the first is a prediction or assertion, the second a command, the third a question or request. This separation is not cosmetic — it reveals that the same content can be packaged in radically different kinds of social acts. Searle introduced the force indicator (F) and propositional content indicator (p) to formalize this: an illocutionary act has the structure F(p), where F specifies the kind of act and p specifies what it is about.
Searle also argued that illocutionary acts have conditions of satisfaction — conditions that must hold for the act to succeed or be fulfilled. An assertion is satisfied if the proposition asserted is true. A promise is satisfied if the speaker performs the promised action. A question is satisfied if the hearer provides the requested information. This framework explains why illocutionary acts generate normative commitments: to assert sincerely is to commit yourself to the truth of what you asserted; to promise is to incur an obligation. Language is not just a channel for information — it is a mechanism for creating normative relationships between speakers.
Searle classified illocutionary acts into five broad categories: assertives (committing the speaker to the truth of a proposition), directives (attempting to get the hearer to do something), commissives (committing the speaker to a future action), expressives (expressing a psychological state), and declarations (changing the world by saying something, like "I hereby declare you married"). This taxonomy is powerful because it shows that illocutionary diversity is not chaos — underlying the variety of things we do with words is a small number of fundamental relationships between speaker, hearer, and world. Understanding Searle's framework equips you to analyze any utterance: what is the propositional content? What kind of act is being performed? What conditions would satisfy it? And what normative commitments does the speaker thereby incur?
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