Disentangling relative from absolute amplitude in Fitts' law experiments
CHI '01 Extended Abstracts on Human Factors in Computing Systems
International Journal of Human-Computer Studies - Special issue: Fitts law 50 years later: Applications and contributions from human-computer interaction
Fitts' throughput and the speed-accuracy tradeoff
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
An informatic rationale for the speed-accuracy trade-off
SMC'09 Proceedings of the 2009 IEEE international conference on Systems, Man and Cybernetics
A new test of throughput invariance in Fitts' law: role of the intercept and of Jensen's inequality
BCS-HCI '12 Proceedings of the 26th Annual BCS Interaction Specialist Group Conference on People and Computers
The effect of time-based cost of error in target-directed pointing tasks
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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The widely-held view that Fitts' law expresses a speed/accuracy trade-off is presumably correct, but it is vague. We outline a simple resource-allocation theory of Fitts' law in which movement time and error trade for each other. The theory accounts quite accurately for the data of Fitts' (1954) seminal study, as well as some fresh data of our own. In both data sets we found the time/error trade-off to obey a power law. Our data, which we could analyze more thoroughly than Fitts', are consistent with a square-root function with a single adjustable constant. We suggest that the resource-allocation framework should help combine information and energy considerations to allow a more complete account of Fitts' law.