Never. Peter Norvig's Powerpoint version of the Gettysburg Address One of the most common mistakes I see in online courses that have been converted from face-to-face is the use of Powerpoint files as replacements for what was an in-class presentation complete with live audio and a real person talking. Sure, it's tempting to think that all you need to do is upload the Powerpoint file to your online course and you are done. Your students will login, go through the trouble of downloading your file and opening it in Powerpoint or some other application. They may marvel at your choice of template as long as they haven't seen it before, but they will find one important thing missing with the presentation – You. Without your voice, the Powerpoint file is at best just an outline or rough sketch of your presentation and may lead to more confusion than learning. Most of the solitary Powerpoint files I see were not inspired by the kinds of design examples you'll find on Pr
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