Enabling devices, empowering people: the design and evaluation of Trackball EdgeWrite

Disability and Rehabilitation. Assistive Technology
Jacob O Wobbrock, Brad A Myers

Abstract

To describe the research and development that led to Trackball EdgeWrite, a gestural text entry method that improves desktop input for some people with motor impairments. To compare the character-level version of this technique with a new word-level version. Further, to compare the technique with competitor techniques that use on-screen keyboards. A rapid and iterative design-and-test approach was used to generate working prototypes and elicit quantitative and qualitative feedback from a veteran trackball user. In addition, theoretical modelling based on the Steering law was used to compare competing designs. One result is a refined software artifact, Trackball EdgeWrite, which represents the outcome of this investigation. A theoretical result shows the speed benefit of word-level stroking compared to character-level stroking, which resulted in a 45.0% improvement. Empirical results of a trackball user with a spinal cord injury indicate a peak performance of 8.25 wpm with the character-level version of Trackball EdgeWrite and 12.09 wpm with the word-level version, a 46.5% improvement. Log file analysis of extended real-world text entry shows stroke savings of 43.9% with the word-level version. Both versions of Trackball EdgeWri...Continue Reading

References

Dec 9, 1993·Assistive Technology : the Official Journal of RESNA·P Guerette, E Sumi
Dec 29, 2000·International Journal of Rehabilitation Research. Internationale Zeitschrift Für Rehabilitationsforschung. Revue Internationale De Recherches De Réadaptation·C S FichtenM E Fossey
Aug 23, 2002·Nature·David J Ward, David J C MacKay
Mar 1, 1953·Journal of Experimental Psychology·R HYMAN

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Citations

Jun 13, 2014·Ergonomics·Hwayeong Kang, Gwanseob Shin
Aug 29, 2017·Disability and Rehabilitation. Assistive Technology·Heidi Horstmann Koester, Sajay Arthanat
Apr 4, 2017·Assistive Technology : the Official Journal of RESNA·Heidi Horstmann Koester, Sajay Arthanat

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