Assessing two new wearable input paradigms: The Finger-Joint-Gesture palm-keypad glove and the invisible phone clock |
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Authors: | Mikael Goldstein Didier Chincholle Mårten Backström |
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Affiliation: | (1) Usability and Interaction Laboratory, Ericsson Research AB, ERA/T/KU, Torshamnsgatan 23, Kista, SE-16480 Stockholm, Sweden |
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Abstract: | Text and digit entry speed of two wearable one-handed input paradigms, the Finger-Joint-Gesture palm-keypad glove and the Invisible Phone Clock, were benchmarked against traditional one-handed cellular phone keypad input in a repeated-measurement design employing 18 subjects using a 9-word sentence. No significant difference in error-corrected text entry speed (5.3 ec-wpm) was found. Digit entry speed was significantly faster (8.3 ec-wpm) and differed significantly between input paradigms. Furthermore, digit entry was fastest for the traditional cellular phone keypad and slowest for the Invisible Clock keypad. A prediction model based on Fitts' law slightly overestimated text entry speed for novice users. Another prediction model, where each movement time between successive keys was corrected for key repeat time for each specific input paradigm, predicted the experimental results more accurately. Thirteen of the subjects ranked the Invisible Phone Clock as 1st choice. The subjects' mapping of the Ericsson cellular phone functions (YES, CLR, NO, <,> and Address Book) was not according to the designer's model, partly due to functional fixedness. The input paradigms could be suitable candidates for new fragmentised interfaces where wearability is the key issue. |
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Keywords: | Clock metaphor Error-corrected text/digit entry speed Fitts law Functional fixedness Key-travel Mobile Mock-up Onehanded Phalanges Speed-accuracy trade-off Telephone keypad Wearable |
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