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International Journal of Human-Computer Studies - Special issue: Fitts law 50 years later: Applications and contributions from human-computer interaction
International Journal of Human-Computer Studies - Special issue: Fitts law 50 years later: Applications and contributions from human-computer interaction
International Journal of Human-Computer Studies - Special issue: Fitts law 50 years later: Applications and contributions from human-computer interaction
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International Journal of Human-Computer Studies - Special issue: Fitts law 50 years later: Applications and contributions from human-computer interaction
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Human-Computer Interaction
IHM '07 Proceedings of the 19th International Conference of the Association Francophone d'Interaction Homme-Machine
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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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ACM Transactions on Computer-Human Interaction (TOCHI)
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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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ACM Transactions on Computer-Human Interaction (TOCHI)
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International Journal of Human-Computer Studies
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HCI'13 Proceedings of the 15th international conference on Human-Computer Interaction: interaction modalities and techniques - Volume Part IV
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An intriguing anomaly of the usual way of designing Fitts' law experiments in experimental psychology and HCI is exposed: experiments are traditionally designed so as to carefully balance two ancillary factors, target distance D and target width W, but not task difficulty, the factor unanimously thought to be crucial. Troubling factor confounds and hence quantitative estimation errors result from this inconsistency. The problem, it is suggested, may be fixed if the equivocalness of the fractional expression D/W that appears on the right-hand side of Fitts' law equations is acknowledged. This two-degree-of-freedom expression can be taken to specify either D and W or the form F and the scale S of the movement task. The paper ends up with practical recommendations for the design of consistent Fitts' law experiments. In most cases eliminating one factor will allow a safer estimation of Fitts' law parameters, while simplifying the experimental work.