A true powerpoint obsessive writes:
The boards of directors of every organization should immediately ban the use of bullet points on PowerPoint screens …
Adding text to a screen in a multimedia presentation that is identical to the narration harms the ability of the audience to understand the information. Removing the text increases retention, or the ability to remember the information, by 28%. Even more significantly, removing the text increases transfer, or the ability to apply the information, by 79%.
Stirring stuff – though some of those who comment on the article argue – plausibly to my mind – that the problem may be less bullets as such, and more allowing bullets (or anything else on the slide) to be a substitute script for the presenter.