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Size Matters

Fitts's Law is applied to the design of interactive objects in graphical displays. As the size of an object increases the selection time goes down and as the distance between the user's starting point and the object decreases so to does the time taken to make the selection. Conversely, small objects, placed far away from the user's starting position take longest to select. Therefore, designers should aim to make objects as close to one another when they are used in the same sequence chain. They should also try to make the interactive elements of the screen as large as is sensible with the amount of space available. Small objects spread apart take the longest time to select; avoid this combination of design features as much as possible.


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