Purpose, Emphasis, Support, and Clarity

When you look at your own presentation from an audience member's perspective, you might consider how to distinguish the main points from the rest of the information. You might also consider the relationships being presented between ideas or concepts, or how other aspects of the presentation can complement the oral message.

Your audience naturally will want to know why you are presenting the visual aid. The purpose for each visual aid should be clear, and almost speak for itself. If you can't quickly grasp the purpose of a visual aid in a speech, you have to honestly consider whether it should be used in the first place. Visual aids can significantly develop the message of a speech, but they must be used for a specific purpose the audience can easily recognize.

Perhaps you want to highlight a trend between two related issues, such as socioeconomic status and educational attainment. A line graph might show effectively how, as socioeconomic status rises, educational attainment also rises. This use of a visual aid can provide emphasis, effectively highlighting key words, ideas, or relationships for the audience.

Visual aids can also provide necessary support for your position. Audience members may question your assertion of the relationship between socioeconomic status and educational attainment. To support your argument, you might include on the slide, "According to the U.S. Department of Education Study no. 12345," or even use an image of the Department of Education Web page projected on a large screen. You might consider showing similar studies in graphic form, illustrating similarities across a wide range of research.

Clarity is key in the use of visual aids. One way to improve clarity is to limit the number of words on a PowerPoint slide. No more than ten words per slide, with a font large enough to be read at the back of the room or auditorium, is a good rule of thumb. Key images that have a clear relationship to the verbal message can also improve clarity. You may also choose to illustrate the same data successively in two distinct formats, perhaps a line graph followed by two pie graphs. Your central goal is to ensure your visual aid is clear.