Difficulty of a Task The difficulty in acquiring a target(such as using your mouse to
Chapter 4, Problem 101(choose chapter or problem)
Difficulty of a Task The difficulty in acquiring a target(such as using your mouse to click on an icon on yourcomputer screen) depends on the distance to the target andthe size of the target. According to Fittss Law, the index ofdifficulty (ID) is given byID log12A/W2log 2where W is the width of the target and A is the distance tothe center of the target. Compare the difficulty of clickingon an icon that is 5 mm wide to clicking on one that is10 mm wide. In each case, assume that the mouse is100 mm from the icon.
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