Communication through language fundamentally involves performing acts—making requests, sharing information, expressing emotions, committing to positions. Understanding communication requires analyzing the acts speakers perform through utterances, not just the propositions they express. This act-based framework unifies diverse phenomena: irony, politeness, indirect requests, and presupposition all become intelligible when viewed through the lens of what a speaker is doing with words.
From your study of Austin's speech act theory, you know that utterances are not merely vehicles for expressing propositions — they perform actions. Saying "I promise" creates a commitment; saying "I apologize" performs an apology; saying "I sentence you" imposes a legal consequence. The topic of speech acts and the nature of communication extends this insight beyond the special case of explicit performatives to a general theory of what communication is: not the transmission of propositions from one mind to another, but the performance of acts that coordinate, commit, request, warn, and persuade.
The central claim is that every utterance has multiple dimensions. The locutionary act is the propositional content — what is literally said. The illocutionary act is what the speaker is doing with the utterance — asserting, requesting, warning, promising, questioning. The perlocutionary act is the effect the speaker intends to produce in the hearer — convincing, reassuring, intimidating, amusing. A purely propositional analysis captures only the first dimension and misses the other two. When a dinner guest says "it's quite chilly in here" while glancing at an open window, the locutionary content is a temperature report, but the illocutionary force is an indirect request to close the window, and the intended perlocutionary effect is that the host closes it. Understanding the communication requires identifying the act being performed, not just parsing the proposition expressed.
Indirect speech acts make the gap between propositional content and illocutionary force especially vivid. "Can you pass the salt?" is grammatically a question about ability, but communicatively a request. "It would be nice if someone took out the trash" is grammatically a hypothetical observation, but communicatively a directive. These are not failures of language — they are a systematic feature of how communication works. Speakers rely on shared context, social conventions, and mutual knowledge to convey illocutionary force that the literal content does not encode. Listeners routinely interpret utterances at the level of intended act rather than literal proposition. This is why context is so central to meaning: the same sentence — "the door is open" — can be a report, an invitation, a warning, or a complaint depending on who says it, to whom, and in what situation.
The speech-act framework unifies phenomena that seem unrelated under a purely propositional view of language. Irony, politeness strategies, presupposition, and conversational implicature all become intelligible when we recognize that speakers are doing things with words, not just encoding information. A polite refusal ("I'm afraid I have other plans") performs the act of declining while minimizing social friction — its propositional content is almost irrelevant to its communicative function. An ironic remark ("great weather we're having" during a storm) performs an act of complaint or bonding precisely by saying something whose literal content is false. Understanding communication as action — as speakers performing acts and hearers recognizing those acts — is the foundation on which Grice's theory of conversational implicature and the broader pragmatics-semantics boundary are built.
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