Recording of PowerPoint presentations with accompanying voiceovers are a popular way of presenting "lecture style" content for online delivery. There are several tools for creating these products, including Camtasia Studio and D2L Capture. These "screencasting" tools are software applications that allow instructors to record their screens with narrations.
Mini-lectures are one popular form of presentation voice-over. In this brief video Sandra Buerger discusses the rational for mini lectures as well as tips for how to best implement them in online course contexts:
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