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Have one idea per slide. 
 
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Use contrast and size to direct audience focus. 
 
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Avoid sentences on powerpoint when speaking. 
 
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Use dark backgrounds. 
 
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Have no more than 6 objects per slide. Use one or two large images rather than several small images. 
 
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Avoid flashy transition and sound effects as they can be distracting and negatively affect your credibility. 
 
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Use single sans-serif fonts such as Arial or Helvetica. Avoid serif fonts such as Times New Roman. 
 
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Standardize positions, color, and styles. 
 
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Check the spelling and grammar. 
 
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Learn how to navigate slide deck. Audience may ask to see previous slides. Check out How to create a Prezi in PowerPoint for non-linear presentations | POWERPOINT ZOOM TUTORIAL to learn how you can make a interactive/non-linear powerpoint. 
 
 
 
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Figure 1. Serif vs. San-serif