Glossary
Scannability
What is scannability?
Scannability is how easily readers can find what they need without reading every word. Clear headings, short paragraphs, and well-chosen lists give them places to look.
How it works
In Nielsen's 1997 study, 79% of test users scanned new web pages. That finding describes the study's users and tasks, rather than a permanent rule for everyone online.
A documentation team might turn a dense paragraph into numbered setup steps. Readers can then see the sequence and return to the step they need. Testing can show whether the change helps them finish.
Use headings that name the answer, put key information near the beginning, and reserve bold text for a few useful anchors. Too many competing highlights make it harder to see what deserves attention.
Observed scanning patterns
Nielsen Norman Group’s eye-tracking reports describe several patterns.
F-shaped pattern
In an F-shaped pattern, readers look across upper lines, make a shorter horizontal pass farther down, and scan down the starting side of the text. The group associates this with poorly formatted text and readers seeking a quick answer; it is not a rule for every page or reader. Right-to-left text can produce a mirrored pattern.
Layer-cake pattern
In the layer-cake pattern, readers concentrate on headings and subheadings, then inspect selected body text. Clear, accurate section labels support that approach. These are observations from particular tasks and layouts, not instructions to arrange all important words in an F or proof that nobody reads full paragraphs.
Scannability vs. readability
Scannability concerns finding the relevant passage. Readability concerns understanding it once you read it. A page needs both.
Why it matters
Help people find the answer, then give them enough detail to understand it. Some readers scan; others need to read closely. A good page supports both.