Simple design does make more efficiency. This is the basic
designs.
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Simple is an adjective. As in a simpler manner or a simple
design. Can be used as a noun as in, an ignorant or foolish
person
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There are 7 principles of simple design. The 7 designs are
equitable use, flexible use, simple use, perceptible information,
tolerance for error, low physical efforts and size.
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A atypical design would be something simple but extravagant