Over this series of 12 lectures, Austin argues against the foundational assumption in analytic philosophy of language that the only forms of linguistic utterance that are worthwhile to study are assertive or descriptive in kind, and that the primary way by which to evaluate these is to determine their binary truth value. Instead, Austin proposes that the majority of our meaningful language use is non-assertive and performative; that is, we use linguistic utterances to make things happen, or get things done. Paradigmatic performatives involve "I do" at a marriage; "This baby shall be named X" in deciding the name of a new child, or "I bet X" in making a bet. In all these cases, we do not describe something that is already in existence, but we bring something into existence by virtue of our linguistic utterance. Austin dedicates Lecture 1 to introducing performatives and their significance in the background of the mainstream tradition of philosophy of language.
Performatives are not truth-evaluable, or at least not in the way that assertions have typically been taken to be. Rather, performatives can be more or less appropriate, or be more or less successful in enacting the intended outcome of the language use. For example, "I do" could be inappropriate if it is said sincerely but under circumstances other than those of an official marriage; or these circumstances could be present, but the person uttering the words could be in bad faith, not intending to keep the marriage. Austin takes Lectures 2-4 to generating a taxonomy of all the ways different kinds of performatives might succeed or fail.
Austin distinguishes between a number of kinds of performatives. There are five kinds he finds worthwhile to distinguish, and admits this is a tentative listing, for these kinds might overlap in ways or be non-exhaustive. All cases of language use, whether a performative or traditional assertion, might be examined for three primary aspects or dimensions: every utterance has (1) locutionary, (2) illocutionary, and (3) perlocutionary aspects.
The locutionary aspect refers to what we typically regard as the semantic meaning of an utterance. Austin examines this in terms of sense and reference. For example, the locutionary aspect of "I do" might include the personal identity of the speaker and the act of marrying, or whatever the speaker is doing. The illocutionary aspect refers to the action that the utterance of the linguistic expression in effect accomplishes. For example, officiating the marriage is an illocutionary effect of the aforementioned utterance. The perlocutionary aspect refers to the effects the speaker intends to have on the listener by uttering the expression. For example, the aforementioned expression, if uttered by an ecstatic soon-to-be wife, might have the perlocutionary role of making a commitment or sealing mutual joy. Austin takes the majority of the book, Lectures 5-12, to clarify these distinctions.
In the last lecture, Austin mentions that all linguistic expressions, assertions and statements included, are equally evaluable in terms of appropriateness. It is a modern myth that assertions and statements uniquely are truth-evaluable, in a logical, binary way. Austin points out that in principle truth conditions, or states of affairs or facts that would determine the truth or falsity of an assertion, require that we interpret or individuate them. This interpretative act always involves some degree of subjective decision. For example, someone might assert "His head is square-shaped." For a geometer, this is false, since for a shape to count as a square it must meet certain stringent conditions. But for laypeople, this is true, since we only expect the designation of ordinary objects as certain geometric forms to be generally approximate.
Austin thus shows that our interests, social position, and other pragmatic conditions will influence the precise states of affairs or facts that show up to us in a given situation. Different people might take up different facts as relevant to determining the truth or falsity of the same linguistic expression in the same situation.
Overall, this book was a joy to read. Austin is an extraordinarily clear writer, and his ideas are deep and against the mainstream. Particularly, I found two points in this book most fascinating. One is this pragmatist point made in the last lecture. It is lovely to acknowledge that truth values of seemingly purely factual statements depends on social conditions, as the appropriateness of uttering performatives (e.g., "I do) does. I think, however, that there are important differences between binary truth valuation and multi-dimensional appropriateness evaluation. Admittedly, it is not Austin's purpose to go into this; his work leaves me curious about it though, and I would like to read some other work that does cover it.
Here are some of my random thoughts on this matter. It seems that certain statements are just not appropriateness-evaluable in the way the examples Austin give are. For instance, the seemingly purely factual statement "My hair is 23 inches long" does not seem up to negotiation. No matter what a person's social background is, a numeric measure is the same numeric measure. However, there might be another way to take even this sort of statement as performative. By uttering it, I make it the case that it is appropriate to measure my hair according to quantitative magnitudes, and more specifically, the U.S metric system.
This fact is brought out by this counterfactual: if I instead uttered "My hair is long like the beams of moonlight" (lol) I would make it the case that it is appropriate to relate to my hair poetically, to see it as a part of the majestic realm of mother nature. I wonder whether this is the kind of way by which Austin conceives of assertions and statements to be appropriateness-evaluable, rather than truth-evaluable; Austin does not directly give such examples, and I'm not sure whether this kind of example can be accounted for by his view as presented.
If indeed Austin cannot account for this sort of example as a performative, his definition of performitivity does not go deep enough. All linguistic utterances "set the tone" of what kind of vocabulary to think in, or what kind of world shows up to us. We can enter poetic, mythic, or scientific worlds (among more fine-grained sorts of worlds, which Wittgenstein might triangulate by his term "language-game"), depending on the particular expressions we use. The constitutive parts of linguistic expressions typically belong to certain vocabularies, activities, social roles, or perspectives. By using them, we root ourselves in a certain perspective, and get our conversational partners to enter that perspective, too.
The second point I found most interesting is Austin's insight that the majority of language use is non-assertive, non-factual. We use language to get things done. He doesn't dwell on this point, however, and I'd like to do that a bit here. I think a lot of expressions that appear in the form of assertions or descriptions might actually be primarily performative. For example, our minds might easily wander into assertions like "That boy over there is very tall," "The sky is pure blue," or "I am hungry." All of these are descriptive, but their utterance is motivated by particular interests or needs. Their utterance also brings into view new features of the situation, making them phenomenologically salient. This would let our emotions, thoughts, and behaviors respond to these particular features. I mean to say all of this to elaborate on my point above: the performative or illocutionary nature of language might be deeper and more expansive than the way Austin puts it.