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100% through The Information Capacity of the Human Motor System in Controlling the Amplitude of Movement

Chapter 3 · Check Your Understanding

If a target's width (W) is doubled while its distance (D) stays the same, what happens to movement time (MT)?

Movement time isn't about distance or size alone — it's about the ratio between them, which is why Fitts's law still shapes how buttons and menus get designed today.

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