Authors:
Randolph Bias, Doug Gillan
Someone once said, "Gravity—it's not just a good idea, it's the law." In the art-and-science world of user interface (UI) design, the first law we consider—almost the only "law" that gets invoked in our still-too-subjective practice—is Fitts's Law: The time to acquire a physical target is a function of the size of that target and its distance. Why would a forum on evaluation and usability devote space to Fitts's Law? In the first place, much of usability is concerned with selecting—both cognitively and physically—the correct item from a screenful of icons, links, menu items, and other virtual objects. In…
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