Use Fitts's Law to size and place primary vs secondary mobile actions
WHAT IT TESTS: Fitts's size-distance tradeoff applied to mobile thumb zones. OUTLINE: Large primary actions in easy thumb zones; secondary actions farther but keep minimum targets. RED FLAG: Bigger buttons alone, ignoring distance or finger precision.
WHAT IT TESTS: Whether you can translate Fitts's logarithmic size-distance relationship into mobile layout decisions that respect thumb-reach ergonomics and visual hierarchy. ANSWER OUTLINE: First, cite the law: bigger, closer targets reduce acquisition time logarithmically. Second, place large primary actions in the natural thumb zone. Third, position secondary actions farther from the thumb's resting position but never below minimum 48dp touch targets. Fourth, leverage screen edges for infinite effective width.
Read the original → nngroup.com
- #fitts-law
- #mobile-ux
- #interaction-design
- #thumb-zone
- #ui-hierarchy
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