Transcribed Image Text: . Difficulty of a Task The difficulty in “acquiring a target” (such as using your mouse to click

Excerpt
A is the distance to the center of the target. Compare the difficulty of clicking on an icon that is 5 mm wide to clicking on one that is 10 mm wide. In each case, assume that the mouse is 100 mm from the icon.

Transcribed Image Text: . Difficulty of a Task The difficulty in “acquiring a target”
(such as using your mouse to click on an icon on your
computer screen) depends on the distance to the target and
the size of the target. According to Fitts’s Law, the index of
difficulty (ID) is given by
log(2A/W)
log 2
ID
where W is the width of the target and A is the distance to
the center of the target. Compare the difficulty of clicking
on an icon that is 5 mm wide to clicking on one that is
10 mm wide. In each case, assume that the mouse is
100 mm from the icon.

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