THE SHORTEST PATH FROM THOUGHT TO ACTION

Summary from the TLDR Design newsletter

Fitts' Law, originating from Paul Fitts' 1954 experiments on motor control, predicts that target acquisition time increases with distance and decreases with size. Initially foundational for mouse- and pointer-based interfaces, it now informs mobile ergonomics, touch targets, gesture-based spatial computing, and even voice and neural interfaces. Across all modalities, the core principle endures: design should minimize the effort—physical, cognitive, or emotional—between user intent and system response, making interactions feel seamless and natural.