1. Straightforward warnings in the author's own voice.
2. Known error proclaimed.
3. Conflict of facts within the work.
4. Conflicts of belief.
He also describes a number of internal and contextual clues.
1. Readers recognize that a violation has taken place.
2. They infer that the speaker is not opting out (speakers seldom do in literary works, or else there would be no point in writing them).
3. They infer that the speaker is aware of the violation and not merely making a mistake.
4. They infer that the speaker, as they do, recognizes the specific and generic assumptions in effect (for example, that an argument should be directed against another position that people actually hold).
5. They must then hypothesize plausible meanings that fit both the offensive utterance and the cooperative principle, and that seem relevant to the context of the statement.
Thus when Swift's arguer against abolishing Christianity apologizes for stating an unpopular position, the fact that no one actually proposed the position he attacks and that it certainly was not popular will lead us to step 5, since we recognize that the first four assumptions must be true. When we check the notes, we realize from the context that he must be talking about the Test Act. But even if he is, his position still violates the principle of providing clear, concise, relevant, and not excessive information. Therefore, we recognize that he must be talking not only about the Test Act but more general beliefs and behaviors.
In addition to Wayne Booth's book, the following works on irony (among many) are useful.Dane, Joseph A. The Critical Mythology of Irony. Athens: University of Georgia Press, 1991.
Enright, D. J. The Alluring Problem: An Essay on Irony. Oxford: Oxford University Press, 1986.
Hutcheon, Linda. Irony's Edge: The Theory and Politics of Irony. New York: Routledge, 1994.
Knox, Norman. The Word Irony and its Context, 1500-1755. Durham: Duke University Press, 1961.
Mellor, Anne Kostelanetz. English Romantic Irony. Cambridge: Harvard University Press, 1980.
Muecke, D. C. The Compass of Irony. London: Methuen, 1969.
---. Irony and the Ironic. 2nd ed. London: Methuen, 1982.
Swearingen, C. Jan. Rhetoric and Irony: Western Literacy and Western Lies. New York: Oxford University Press, 1991.