Today, when we are asked to present, audiences often expect to see PowerPoint slides. PowerPoint's default slides seem to lock you into a structure: a short heading and then bullet points. Or worse, as Edward Tufte maintained, an "evil" flurry of arty charts. 
An alternative structure, with a free PowerPoint template, is available from Michael Alley at Penn State.  His target audience is scientists.  He proposes an "assertion-evidence" model.  Each slide asserts in a short (two-line) headline sentence.  Then, as evidence, the slide shows one to three illustrations.
Before we make any slides at all, Alley rightly suggests we ask:
- Can I give my audience meaningful illustrations that support without distracting? (Clip art is useless distraction, as is the "chart junk" that Edward Tufte decries.)
 - Will the audience understand the information on each slide?
 - Will the slides be identical to the handout? If the slides will have to eliminate important text, or reproduce large blocks of text, they defeat their purpose.
 - Will slides really improve the audience's understanding by providing pictures, graphs, and color? If slides are merely note cards to guide your talk, think again.
 

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