Clearly State the Purpose of the Speech
This seems like such a basic step, yet it is one too often missed, and without this step it is difficult for the audience to follow, much less evaluate and comprehend, a speech. In both basic composition classes and basic public speaking classes, this function is pretty much the same:
State the thesis of your speech. In all speeches, there should be that one sentence, that one statement that succinctly and accurately lets the audience know what the speech will be about and what the speaker plans to accomplish in the speech. Speakers, especially novice speakers but also experienced ones, are so concerned with the content of the speech that they forget to let us know about the purpose. A good thesis statement clearly announces the topic and purpose of the speech.
For example, a standard problem-solution speech should have a thesis statement that clearly states the problem and the need for a solution. “So right now let’s see how dependence on fossil fuels costs you money and how use of ethanol as a supplement will save you money and save the world from energy obsolescence.” We know the topic and we know what the speaker will be attempting to prove. Once a thesis statement is clearly announced, the final function of the introduction is ready.