Reading Level
Reading level is a tertiary element. It is suggested but optional to include in your product.
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All people read at different levels. High functioning adults can suffer from reading disorders such as dyslexia and hyperlexia. People who do not originally suffer from dyslexia or hyperlexia can so from brain injuries like a stroke. For this reason, it is recommended that most content (excluding white papers and other academic vehicles) be written at an 8th grade reading level for most individuals. This also helps with international language barriers, thus bettering translation.
Here are several readability checkers:
https://www.wordcalc.com/readability/
https://readabilityformulas.com/free-readability-formula-tests.php
Summary Points:
Language should be at an 8th grade reading level
Avoid dated figures of speech
Avoid abstract idioms or most metaphors
Simplified text helps international translation
Dyslexia is the most common reading disorder effecting 20% of our population
Hyperlexia is a disorder with language read or spoken aloud and is less common
Maintain proper capitalization, punctuation, grammar etc.
✔ Qualified Example of an Inclusive Reading Level:
“Ahkenaten was a revolutionary Pharoah who’s expressive shift in art and architecture are viewed as revolutionary.”
✖ Not Qualified :
“Akhenaten’s iconoclastic approach to art and architecture, which saw the abandonment of the rigid and formal artistic conventions of the time in favor of a more naturalistic and expressive style, has earned him a place in the annals of art history as one of its most innovative and revolutionary figures.”
Further On This Topic:
https://www.w3.org/TR/UNDERSTANDING-WCAG20/meaning-supplements.html