> It essentially requires you to be ultra clear in your mind about message and narrative I think this is a requirement (unfortunately too infrequently enforced

> It essentially requires you to be ultra clear in your mind about message and narrative I think this is a requirement (unfortunately too infrequently enforced) for making any presentation to more than a few folks. If a number of people are dedicating their time, brain cells and energy to listen to the presenter, that presenter should make his message as clear as possible. Know exactly what you want to say, write main points into charts, say it. There are some exceptions -- at scientific conferences it is usually OK to lose all but narrow specialists in the last 25-50% of the presentation, but even then the "general" section should be clear.