Bad PowerPoint presentations may consist of unorganized material. For example, text boxes that are cut off and if the presenter is unable to follow what they wrote. Bad grammar and run on and fragment sentences are also consistent with a bad presentation. I think if the presenter doesn't include the audience then they will not have their full attention. Another characteristic is if the text color and text background don't contrast enough, which makes it hard to read and is distracting. If graphics/charts are not included in the presentation it fails to backup the slides and the audience will appreciate seeing visuals instead of simply a bunch of words. Transitioning is also important. For example, making clear subject jumps.
PowerPoints are very useful because they provide a way to clearly present and involve your audience. PowerPoint offers a variety of tools to use in order to gain the attention and to express ideas clearly. At a Mindscience lecture I attended about a month ago, a Dr. in Psychology presented her thesis using a PowerPoint presentation which was full with experiment information, appealing graphics, and solid outlines of her ideas. She even included animated visuals of brain scans, which were very interesting, attention grabbing, and supportive of her thesis.
I agree that text color and text background need to have contrast, otherwise it makes the power point hard to read.
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