EdgeWrite Cole Gleason

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Presentation transcript:

EdgeWrite Cole Gleason Jacob O. Wobbrock, Brad A. Myers, and John A. Kembel. 2003. EdgeWrite: a stylus-based text entry method designed for high accuracy and stability of motion. In Proceedings of the 16th annual ACM symposium on User interface software and technology (UIST '03). ACM, 61-70.

About the Authors Jacob O. Wobbrock Brad A. Myers John A. Kembel Ph.D. at HCII in 2006 Now at University of Washington Leads Mobile and Accessible Design Lab Brad A. Myers Needs no explanation (I hope!) Advisor of Jacob John A. Kembel MS in HCI from CMU Design focus

Goal of EdgeWrite People with motor impairments struggle with gestural text entry Make a text entry method for people with motor impairments: Stability Accuracy Developed at the time when PDAs and Palms were popular Therefore, compared to Graffiti

Problems with Graffiti Relies on stable, smooth gestures Segmented input areas Modal

Two Components of Edgewrite Instead of recognizing a pattern, just look for sequence of corner taps Physical constraints will result in more: Stability Speed Accuracy Feedback Fitts’ Law overshoot

Character Set

Design of EdgeWrite Path doesn’t matter, only corners. Unistroke One mode for punctuation only Capitalization stoke There are alternate forms too, some users tried these

Evaluation (1st Group) 10 users Between subjects design: Grafitti vs. EdgeWrite Introduction, practice session, testing session Realistic entries Results: 18% improvement in keystrokes per character Graffiti has faster time per character, but not faster entry overall Both alphabets very learnable

Evaluation (2nd Group) 4 users with motor disabilities Observation of EdgeWrite with error counts Results: Subject 1: Bounce in Grafitti caused punctuation errors Errors: Graffiti (22/72) and EdgeWrite (68/72) Subject 2: Could not write some characters 8 errors in Graffiti sentence, none in EdgeWrite Diagonals were hard Subject 3: Unable to make some characters in Graffiti, could make them in EdgeWrite 3 errors in Graffiti sentence, none in EdgeWrite Subject 4: “Much easier, my goodness” 2 errors in Graffiti sentence, none in EdgeWrite

Conclusions Future work on trackballs, joysticks, etc. See other publications! Questions: Is EdgeWrite really better than Graffiti for people with and without motor impairments? Development of assistive technology can lead to products and inventions for people without these impairments as well. What is the role of assistive technology research in technology transfer to industry? Evaluations of assistive technology tend to be difficult, as authors and you all noted. How does this impact research and development of assistive technology?