Lloyd F. Bitzer described the concept of the rhetorical situation in his essay of the same name.1 The concept relies on understanding a moment called "exigence," in which something happens, or fails to happen, that compels one to speak out. For example, if the local school board fires a popular principal, a sympathetic parent might then be compelled to take the microphone at the meeting and/or write a letter to the editor. Bitzer defined the rhetorical situation as the "complex of persons, events, objects, and relations presenting an actual or potential exigence which can be completely or partially removed if discourse, introduced into the situation, can so constrain human decision or action as to bring about the significant modification of the exigence."
Some elements of the rhetorical situation include: 1. Exigence: What happens or fails to happen? Why is one compelled to speak out? 2. Persons: Who is involved in the exigence and what roles do they play? 3. Relations: What are the relationships, especially the differences in power, between the persons involved? 4. Location: Where is the site of discourse? e.g. a podium, newspaper, web page, etc. 5. Speaker: Who is compelled to speak or write? 6. Audience: Who does the speaker address and why? 7. Method: How does the speaker choose to address the audience? 8. Institutions: What are the rules of the game surrounding/constraining numbers 1 through 7.
Analyzing the rhetorical situation (which, at its most fundamental, means identifying the elements above) can tell us much about speakers, their situations, and their persuasive intentions.
The ancient Greeks gave special attention to timing--the "when" of the rhetorical situation. They called this kairos, and it identifies the combination of the "right" moment to speak and the "right" way (or proportion) to speak. Let's get back to the school board example. After voting to fire the popular principal,