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Both our textbook and this PowerPoint tutorial in the Required section give helpful tips on slide presentations. I'd like to hear what you learned from these sources that you didn't know before.
Here are a few things to consider. The speaker needs to spend some time looking for truly interesting visuals. I've found, after years of viewing student PowerPoints, that sometimes people use the quick and easy clip art throughout the presentation instead of taking the time to search for more interesting graphics. There are so many amazing photos and artwork on the Internet! If you can't easily find what you need, after doing an Internet search on the topic, click Images at the top of the search page.
Don't forget charts, graphs, and diagrams. People love data, especially something that is easily understandable. However, you can't just plunk a chart on a slide and move on. Take the time to walk the audience through the main points you want them to get from it.
Also, never go more than two slides without a visual element. The audience will concentrate on that while they listen to the speaker. When the audience has nothing to look at, the "boring-ness" of the slide is intensified.