Extending Fitts' law to two-dimensional tasks
CHI '92 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Predicting text entry speed on mobile phones
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
LetterWise: prefix-based disambiguation for mobile text input
Proceedings of the 14th annual ACM symposium on User interface software and technology
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
A comparison of consecutive and concurrent input text entry techniques for mobile phones
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Twiddler typing: one-handed chording text entry for mobile phones
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
ECSCW'01 Proceedings of the seventh conference on European Conference on Computer Supported Cooperative Work
Design and Evaluation of Soft Keyboards for Brahmic Scripts
ACM Transactions on Asian Language Information Processing (TALIP)
Passwords and interfaces: towards creating stronger passwords by using mobile phone handsets
Proceedings of the Third ACM workshop on Security and privacy in smartphones & mobile devices
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When designing a text entry system for mobile phone keypads, a designer needs to overcome the ambiguity that arises from mapping the 26 letters of the roman alphabet to only 12 keys (0--9, *, #). In this paper, we present a novel two-thumb chording system for text entry on a standard 12-key mobile phone keypad and introduce a performance model based on Fitts' Law for an expert user. The model provides a behavioral description of the user and predicts a text entry rate of 55.02 wpm.