LetterWise: prefix-based disambiguation for mobile text input
Proceedings of the 14th annual ACM symposium on User interface software and technology
The Reactive Keyboard
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
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
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
SAK: Scanning ambiguous keyboard for efficient one-key text entry
ACM Transactions on Computer-Human Interaction (TOCHI)
A prototype scanning system with an ambiguous keyboard and a predictive disambiguation algorithm
ICCHP'10 Proceedings of the 12th international conference on Computers helping people with special needs
ICCHP'10 Proceedings of the 12th international conference on Computers helping people with special needs
Humsher: a predictive keyboard operated by humming
The proceedings of the 13th international ACM SIGACCESS conference on Computers and accessibility
Evaluation of an ambiguous-keyboard prototype scanning-system with word and character disambiguation
BCS '10 Proceedings of the 24th BCS Interaction Specialist Group Conference
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Improving augmentative communication systems is necessary for severely physically handicapped people because of the low rate of text entry that doesn't even permit them to communicate simultaneously with other people. This paper presents a reduced virtual keyboard based on scanning with only one switch. The scan matrix consists of only two cells, so ambiguity is present due to the assignment of 26 characters to both keys. In order to disambiguate, users enter each letter in two stages. An estimation of the text entry rate for an expert user is 10.1 words per minute using a scan rate of 0.5 seconds, although this value should be adapted for each individual, leading to different rates.