Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Readability formula(also: readability metric, readability index, readability measure)
- A mathematical formula that estimates the difficulty of reading a text, typically based on features like sentence length, word length, syllable count, or vocabulary frequency. Common formulas include Flesch Reading Ease, Flesch-Kincaid Grade Level, SMOG, and Gunning Fog Index.…
- Reading Fluency
- The ability to read connected text accurately, at an appropriate pace, and with proper expression - distinct from word-level decoding skill on one side and from reading comprehension on the other. Fluency is typically measured along three dimensions: accuracy (proportion of…
- Reading Level(also: Grade Level, Reading Grade Level)
- An estimate of the education or skill level a reader needs to understand a text, usually expressed as a U.S. school grade (e.g., grade 4) or an equivalent band. Reading level is the target output of most readability formulas and automatic readability assessment systems, and it…
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