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Perception & CognitionMember ingredient
Fitts's Law
In rapid aimed movement, selection time generally rises as the target becomes farther away or narrower relative to the movement.
Public evidence overview
One checked source, with its limits.
This preview is not the complete evidence base. Use it as a question to investigate in your own product, not as a prediction of what an individual will do.
Checked source previewAcademic paper
FFitts Law: Modeling Finger Touch with Fitts’ Law
Research-assisted source review
- What it supports
- The expanded finger model explained more variance than conventional Fitts indices across the three experiments, especially for small touch targets.
- Where it may not transfer
- Controlled devices and tasks do not cover all screen sizes, postures, ages or motor abilities. Better model fit does not define an accessible minimum target or include search and comprehension.
See how sources and limitations are checked in our editorial method.
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Practitioner includes the complete checked source set, study context and practical takeaways for this ingredient. The public overview above remains available without upgrading.