Chapter 13

Our Hand–Eye Coordination Follows Laws


This chapter describes Fitts’ law and the steering law, which govern human pointing behavior for all known types of pointing devices, including fingers on touchscreens. It also discusses the implications of these two laws for user-interface design.


Fitts’ law; steering law; pointing devices; pointing; fine-motor control; buttons; links; pop-up menu; pie menu; pulldown menu; pull-right menu; walking menu

Have you ever had trouble hitting a tiny button or link on a computer screen or smartphone, or trouble keeping a screen pointer inside a narrow path required to reach a menu item or link?

Perhaps your hand was jittery because you had recently consumed too much coffee or taken ...

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