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# PERCEPTUAL RULES
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2021-04-11 12:56:04 +00:00
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_Perceptual rules_ help to clearly relay content by using an appropriate visual
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design. They comprise the second part of this guide with the rule sets
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[EXPRESS](04-express.md), [SIMPLIFY](05-simplify.md),
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[CONDENSE](06-condense.md), and [CHECK](07-check.md).
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2021-04-10 22:10:25 +00:00
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2021-04-11 12:56:04 +00:00
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The perceptual rules are based on the work of authors such as William
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[Playfair](https://www.amazon.com/dp/0521855543), Willard Cope
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[Brinton](https://www.amazon.com/dp/1290860955), Gene
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[Zelazny](https://www.amazon.com/dp/007136997X), Edward
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[Tufte](https://www.amazon.com/dp/1930824130), and Stephen
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[Few](https://www.amazon.com/dp/0970601972). All of these rules owe wide
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acceptance to their scientific, experimental, and/or practical experience basis.
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