Here's a helpful post on Jennifer Kammeyer's blog Comm Comm, compiling research on what makes PowerPoint effective.
It's a great little cheat-sheet to have when, for example, you're trying to convince your supervisor of the superiority of a sentence at the top of the slide rather than a word like "results."
There are a lot of theories about what makes PowerPoint effective and some random formulas and rules like 10/20/30, but there's also solid research. Check out her blog and also her website for more on PowerPoint research.
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