The body of your speech should help you elaborate and develop your main objectives clearly by using main points, subpoints, and support for your subpoints.
To ensure that your speech clearly communicates with your audience, try to limit both your main points and subpoints to three or four points each; this applies to your supporting points, as well. Expert testimony is considered supporting point; it is used to support the main and subpoints of your speech.
When a claim or point is made during a speech, the audience initially may be reluctant to concede or agree to the validity of the point. Often this is because the audience does not initially accept the speaker as a trustworthy authority. By incorporating expert testimony, the speaker is able to bolster their own authority to speak on the topic.
Therefore, expert testimony is commonly introduced after a claim is made.
EXAMPLE
If a speech makes the claim, "Manufacturing jobs have been in decline since the 1970s," it should be followed up with expert testimony to support that claim. This testimony could take a variety of forms, such as government employment statistics or a historian who has written on a particular sector of the manufacturing industry.No matter the particular form of expert testimony, it is incorporated following a claim to defend and support that claim, thus bolstering the authority of the speaker.
Search for and watch a TED talk by Barry Schwartz, Professor of Social Theory and Social Action at Swarthmore College. Notice how Schwartz references expert testimony in the course of his speech to justify his point to the audience.
Schwartz begins by showing the job description of a hospital janitor, noting that the tasks do not require interaction with other people. However, Schwartz introduces the expert testimony of actual hospital janitors as a way to complicate the apparent solo nature of janitorial work. Schwartz personalizes the experts with proper names, "Mike," "Sharleene," and "Luke," and uses their testimony to demonstrate that despite the job description, janitors take social interaction to be an important part of their job.
In this instance, Schwartz incorporates the expert testimony of actual janitors as a both a foil and a support. The testimony shows that in fact janitorial work does include interaction with other people, thus foiling the initial presentation of janitorial work as solitary. In addition, Schwartz uses the testimony of these experts to show that they embody the characteristics of wisdom that Schwartz will describe in the remainder of the speech.
Source: Boundless. "How to Incorporate Expert Testimony." Boundless Communications Boundless, 3 Mar. 2017. Retrieved 20 May. 2017 from https://www.boundless.com/communications/textbooks/boundless-communications-textbook/supporting-your-ideas-9/using-testimony-48/how-to-incorporate-expert-testimony-196-4203/
