SHARK2: a large vocabulary shorthand writing system for pen-based computers
Proceedings of the 17th annual ACM symposium on User interface software and technology
Learning shape writing by game playing
CHI '07 Extended Abstracts on Human Factors in Computing Systems
Quasi-qwerty soft keyboard optimization
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Performance optimizations of virtual keyboards for stroke-based text entry on a touch-based tabletop
UIST '10 Proceedings of the 23nd annual ACM symposium on User interface software and technology
Supporting universal usability of mobile software: touchscreen usability meta-test
UAHCI'11 Proceedings of the 6th international conference on Universal access in human-computer interaction: context diversity - Volume Part III
Establishing a baseline for text entry for a multi-touch virtual keyboard
International Journal of Human-Computer Studies
Freehand gestural text entry for interactive TV
Proceedings of the 11th european conference on Interactive TV and video
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Shape writing is an input technology for touch-screen mobile phones and pen-tablets. To shape write text, the user spells out word patterns by sliding a finger or stylus over a graphical keyboard. The user's trace is then recognized by a pattern recognizer. In this paper we analyze and evaluate various keyboard layouts, including alphabetic, optimized (ATOMIK), QWERTY, and interlaced QWERTY for shape writing. The goodness of a layout for shape writing has two aspects. For users' initial ease of use the letters should be easy to visually locate. For long term use, however, the layout should maximize the imprecision tolerance and writing flexibility for all words. We present empirical studies for the former and mathematical analyses for the latter. Our results led to a new layout, interlaced QWERTY, which offers excellent separation of word shapes, while still maintaining a low visual search time. Many of the findings in our study also apply to traditional soft keyboards tapped with a stylus or one finger.