Your slides are ready. You have chosen what to say. Now you must practice aloud going through your slides, always timing yourself. You may find you have no choice but to leave out some important material, so save those slides for some other use. Practicing aloud is the only way you can be sure you will stay within the allotted time. You never want to have the experience of having your audience grow restless and annoyed, or forcing the chair of the session to tell you to stop.
Once you have learned to control the volume and depth of your voice, speaking to a large audience is usually easier than speaking to an audience of 8-15 because the anonymous character of a large audience helps you to lose embarrassment.
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