Abstract
According to Fitts' law, the time to acquire a target can be reduced by either reducing the target's distance or increasing its size. Tognazzini (1999) proposed that the time to acquire a target on graphical user interfaces could be reduced further by moving targets to the edge of the screen (i.e., edge targets). Two studies tested these predictions with a web browser interface's back-button (Experiment 1) and scroll bar (Experiment 2). Results support the aforementioned hypotheses. Edge targets were always faster to acquire than targets placed one pixel from the edge of the screen. However, within the constraints of the current studies, this speed advantage is maximal at approximately 393 ms for target heights ≥ 2.00 cm and target distances ≥ 11.75 cm. Design recommendations and a cost/benefit analysis are given.
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