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There are many factors to keep in mind when using visual aids. These are three of them.
What are
1) illustrating your speech's main points,
2) using color to emphasize detail or compare ideas,
3) practicing so you know it will run smoothly,
4) making sure your audience can see it,
5) keeping it out of sight until you're ready to use it,
6) facing the audience and not the visual, and
7) putting it away when you're finished.