Takahashi method: Masayoshi Takahashi uses nothing but text in his slides. The text is huge,usually numbering no more than ten characters. Stanford law professor Lawrence Lessig has a similar approach, sometimes called the Lessig method. Here's an example of the Takahashi method in action.
Monta method: This approach involves showing a sentence with parts of it covered or a question with the answer covered. The presenter reveals the answer after giving the audience a bit of time to think. This is a way to get your audience more involved. Here's an example of the Monta method in action.
I read about these methods at Presentation Zen, where you can read more about the Takahashi and Monta methods, as well as many others.
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