LetterWise: prefix-based disambiguation for mobile text input
Proceedings of the 14th annual ACM symposium on User interface software and technology
The Reactive Keyboard
The Psychology of Human-Computer Interaction
The Psychology of Human-Computer Interaction
KSPC (Keystrokes per Character) as a Characteristic of Text Entry Techniques
Mobile HCI '02 Proceedings of the 4th International Symposium on Mobile Human-Computer Interaction
Phrase sets for evaluating text entry techniques
CHI '03 Extended Abstracts on Human Factors in Computing Systems
Towards an adaptive communication aid with text input from ambiguous keyboards
EACL '03 Proceedings of the tenth conference on European chapter of the Association for Computational Linguistics - Volume 2
Automatic evaluation of assistive interfaces
Proceedings of the 13th international conference on Intelligent user interfaces
Proceedings of the 10th international ACM SIGACCESS conference on Computers and accessibility
Text Entry System Based on a Minimal Scan Matrix for Severely Physically Handicapped People
ICCHP '08 Proceedings of the 11th international conference on Computers Helping People with Special Needs
Text entry in the e-commerce age: two proposals for the severely handicapped
Journal of Theoretical and Applied Electronic Commerce Research
Ambiguous Keyboards and Scanning: The Relevance of the Cell Selection Phase
INTERACT '09 Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part II
The one-key challenge: searching for a fast one-key text entry method
Proceedings of the 11th international ACM SIGACCESS conference on Computers and accessibility
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Ambiguous keyboards are common in small-size devices such as mobile phones, but they can be applied to other fields such as Augmentative and Alternative Communications, and specifically addressed to people with severe motor disabilities. This research proposes a novel alternative to assign letters to keys, where letters with similar graphical characteristics are grouped into the same key, leading to families of four, three and two-key simple and easy-to-learn layouts. All layouts have been analyzed for a scanning system that implements a word and a character disambiguation algorithm using only one switch as input device. With the best three-key layout, the text entry speeds predicted were 16.7 wpm using word disambiguation and 10.8 wpm for character disambiguation, with a 0.5 seconds scan period. In an experiment conducted with 6 participants and dynamic scan period, average entry speeds reached 12.2 and 6.3 wpm respectively. The top speeds reached by single participants were 16.9 and 8.3 wpm.