11.2 Functions of Presentation Aids

11.2 Functions of Presentation Aids

You might wonder whether presentation aids are necessary. When you have prepared and practiced your speech carefully, should your words be enough?

Strong presentation aids cannot repair a poorly researched, organized, or delivered speech. When used thoughtfully, however, they can make an effective speech even stronger.

Presentation aids serve several important functions. They can:

• Improve audience understanding.
• Support memory and retention.
• Add variety and maintain interest.
• Enhance the speaker’s credibility.

Presentation aids can also create problems when they are poorly designed, difficult to access, unrelated to the message, or dependent on technology that fails. The following sections explain how to use presentation aids effectively while avoiding common mistakes.

Improving Audience Understanding

Communication can be complicated, and misunderstandings are common. Most people can recall situations in which they misunderstood someone or were misunderstood by someone else. These challenges occur in public speaking as well as in everyday conversation.

One reason misunderstandings happen is that people may perceive and interpret the same information differently.

For example, the Rubin vase is a well-known visual illusion that may appear to show either a vase or two faces looking toward each other. Another familiar illusion, My Wife and My Mother-in-Law, may appear to show either a younger woman or an older woman.

These examples demonstrate that people can encounter the same visual information and interpret it in different ways.

Because interpretation varies, speakers must plan messages carefully. Thoughtful preparation increases the likelihood that audience members will understand the message as the speaker intends.

Presentation aids can reduce confusion by clarifying complex information and emphasizing important points.

Clarifying Information

Clarification is essential in public speaking. When part of a message is unclear, audience members may misunderstand the speaker’s main points or leave without understanding the intended conclusion.

Presentation aids are especially useful when a speaker is explaining:

• Complex processes.
• Detailed comparisons.
• Geographic relationships.
• Numerical information.
• Abstract concepts.
• Structures or systems.

Charts, diagrams, maps, photographs, models, and demonstrations can make information more concrete and easier to follow.

For example, explaining the stages of a complex process only through spoken description may be difficult for listeners. A clearly labeled diagram can show how each stage relates to the next.

Emphasizing Important Ideas

Presentation aids can also emphasize important information. A well-designed visual signals which ideas, figures, relationships, or details deserve special attention.

Emphasis may be created by:

• Displaying a key statistic.
• Highlighting one portion of a chart.
• Enlarging an important detail in an image.
• Using a short quotation or phrase.
• Comparing two objects or images.
• Showing a sequence step by step.

Emphasis should not rely on color alone because some audience members may not perceive color differences. Combine color with labels, patterns, symbols, position, or spoken explanation.

Clarifying and emphasizing are two important ways presentation aids improve audience understanding. By making information easier to interpret and drawing attention to what matters most, presentation aids increase the likelihood that listeners will follow the speaker’s ideas.

Supporting Audience Memory

Another important function of presentation aids is to help audience members remember information.

People are more likely to recall ideas when information is organized clearly, reinforced through more than one mode, and connected to meaningful examples. A useful visual can give listeners another way to process and retrieve information after the speech has ended.

Images, charts, diagrams, timelines, and other aids may serve as memory cues. When these materials are simple, relevant, and clearly explained, they reinforce the spoken message.

Reinforcing Important Information

A presentation aid should reinforce rather than duplicate the speech word for word.

For example, a slide containing a short phrase, relevant image, or simple diagram can remind audience members of the main idea while allowing them to continue listening to the speaker.

A slide filled with complete paragraphs, however, may encourage audience members to read instead of listen.

Showing Organization

People generally remember information more easily when it is presented in a clear and logical sequence.

Presentation aids can reveal the structure of a speech by:

• Previewing the main points.
• Displaying a timeline.
• Showing the stages of a process.
• Comparing categories.
• Summarizing key ideas.

For example, a brief slide that previews the main points can help listeners understand how the speech is organized. Later slides can reinforce that structure as the speaker moves from one point to the next.

Supporting the Speaker’s Memory

Presentation aids can also support the speaker’s memory. When speakers rehearse with their visual materials, they begin to associate particular parts of the speech with specific slides, images, objects, or demonstrations.

These cues can help a speaker remember what comes next. However, presentation aids should not become a substitute for preparation. Speakers must still be able to continue if a slide does not appear or a piece of equipment fails.

Adding Variety and Interest

A third function of presentation aids is to make a speech more engaging. Visual, auditory, and physical elements can capture attention and provide variety during a presentation.

For example, a speech about different varieties of roses may be more meaningful when the audience can see images of each variety. Actual flowers could provide an even more direct comparison when the setting, safety requirements, and audience needs permit their use.

Similarly, a presentation for culinary professionals about Indian spices might include sealed samples that audience members can see or smell. Food samples require additional planning because of allergies, dietary restrictions, sanitation, accessibility, and institutional rules.

Presentation aids should add interest because they contribute to the message, not merely because they are entertaining.

An aid that is dramatic but unrelated to the speech can distract the audience from the speaker’s purpose. The most effective aid is not necessarily the most elaborate one. It is the aid that helps the audience understand and remember a specific idea.

Enhancing a Speaker’s Credibility

Presentation aids can influence how credible and professional a speaker appears. However, they cannot compensate for weak content, inadequate research, limited preparation, or ineffective delivery.

Poorly designed or distracting aids may reduce credibility even when the speech itself is strong.

Effective presentation aids should be:

• Accurate.
• Relevant.
• Clearly organized.
• Easy to read or understand.
• Free from spelling and formatting errors.
• Properly attributed.
• Accessible to audience members with disabilities.

Design Quality

Text and images should be large enough for audience members to perceive from the back of the room. Slides should avoid clutter, unnecessary decoration, excessive animation, and complicated layouts.

Small errors, including misspellings, inconsistent formatting, inaccurate labels, or confusing graphs, may distract listeners and weaken the speaker’s credibility.

Source Attribution

Speakers should credit sources used in presentation aids.

If a slide includes a chart, graph, map, quotation, photograph, illustration, or data created by someone else, the source should be identified in a readable location on the slide. The speaker may also provide fuller source information in a final reference slide, handout, or accompanying document.

Attribution should be accurate enough for audience members to identify the original source. Simply writing “Google Images” or “the Internet” is not sufficient because those services are not the creators of the material.

Failure to provide attribution may weaken credibility and may also violate copyright or licensing requirements.

Accessibility and Credibility

Accessible presentation aids also contribute to professionalism and credibility. Speakers should ensure that essential information is available to audience members who may not be able to see, hear, distinguish color, or interact with the aid in the same way as other listeners.

Accessible practices may include:

• Describing meaningful visual content aloud.
• Providing captions for video and synchronized media.
• Providing transcripts for audio content.
• Using sufficient color contrast.
• Avoiding color as the only way to communicate meaning.
• Using readable text sizes.
• Explaining charts and diagrams clearly.
• Providing accessible digital copies when appropriate.

When presentation aids are accurate, clear, accessible, and professionally designed, audiences are more likely to view the speaker as knowledgeable, prepared, and trustworthy.

Avoiding Problems with Presentation Aids

Presentation aids can create difficulties when they are overused, overly complicated, poorly timed, inaccessible, or dependent on unreliable technology.

Careful planning and realistic practice can reduce these risks.

Use Only What Is Necessary

Use only as many presentation aids as necessary to support the message or meet the requirements of the assignment.

The number and technical complexity of the aids should never overshadow the speech. Audience members should remember the speaker’s ideas rather than the number of animations, slides, objects, or media clips used.

Work Within Available Technology

Keep presentation aids within the limits of the technology and equipment available in the speaking location.

Whether the technology works or fails on the day of the speech, the presentation usually must continue. Consider possible problems in advance:

• What will you do if the slide file will not open?
• What will you do if the display or projector fails?
• What will you do if the lectern, easel, or table is unavailable?
• What will you do if the internet connection is unavailable?
• What will you do if an online video does not load?
• What will you do if the audio cannot be heard?

Speakers should test the equipment before the presentation whenever possible and confirm that they know how to operate it.

Create a Backup Plan

Bring presentation files in more than one accessible format or location. For example, save a copy on a portable drive and in an approved cloud-storage service. When appropriate, also save a PDF version that preserves the basic visual content if presentation software is unavailable.

Do not rely solely on an email attachment because internet access may not be available.

Bring any simple supplies that may be necessary, such as removable tape for a poster, but confirm that their use is allowed in the presentation space.

Most importantly, know the speech well enough to continue without the aid. The presentation aid supports the message; it does not replace the message.

Avoid Overly Elaborate Aids

The audience’s ability to perceive and understand the aid is more important than its technical sophistication.

Presentation aids should communicate information clearly without distracting from the message. Simplify them as much as possible and emphasize only the information the audience needs at that moment.

Just as a short speech should not contain twenty main points, a single visual should not contain too many categories, labels, data points, or competing ideas.

Explain Every Presentation Aid

Presentation aids do not speak for themselves. When displaying a visual aid, explain what it shows and identify the features the audience should notice.

When using an audio excerpt, tell listeners what they should listen for before playing it. When using video, explain which actions, details, or ideas support the point you are making. Provide this guidance before the clip when speaking over it would prevent audience members from hearing the original audio.

Do not merely display a chart and say, “As you can see.” Audience members may not know what they are expected to notice, and some may not be able to see it. State the important conclusion aloud.

Display Aids Only When Needed

Show each aid when discussing the information it represents. Remove it, hide it, or move to a neutral slide when it is no longer relevant.

Leaving an unrelated image or slide visible may divide the audience’s attention between the visual and the speaker’s current point.

Practice with the Aids

Practice the full speech using the actual presentation aids whenever possible.

Rehearsal helps you determine:

• When each aid should appear.
• How long it should remain visible.
• How you will introduce and explain it.
• Where you will stand.
• Whether the text is readable.
• Whether the audio can be heard.
• Whether the presentation fits the time limit.
• What you will do if the technology fails.

Effective presentation aids result from planning, design, accessibility, attribution, and rehearsal. When these elements work together, presentation aids can improve understanding, strengthen memory, maintain interest, and enhance the speaker’s credibility.