The rule
Write at a 5th-to-8th-grade reading level to ensure universal comprehension.
Why it matters
Simple language reduces the mental effort required for people with learning or thinking differences to process information. It also helps users who are stressed, in a rush, or not fluent in the language.
How to apply it
- Aim for one main point per sentence.
- Keep sentences between 15 and 25 words.
- Use active voice and present tense whenever possible.
- Avoid jargon, metaphors, and complex idioms.
Example
Before and after
Avoid
"Utilize the interface to facilitate a transaction."
Better
"Use this page to buy your tickets."
Tensions and exceptions
Technical subjects often require specialized jargon. When these terms are necessary, you must provide definitions inline or in a linked glossary to support the user.