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ABSTRACT

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.

REFERENCES

• 1: Rebecca E. Grinter , Margery A. Eldridge, y do tngrs luv 2 txt msg?, Proceedings of the seventh conference on European Conference on Computer Supported Cooperative Work, p.219-238, September 16-20, 2001, Bonn, Germany
• 2: Kent Lyons , Thad Starner , Daniel Plaisted , James Fusia , Amanda Lyons , Aaron Drew , E. W. Looney, Twiddler typing: one-handed chording text entry for mobile phones, Proceedings of the SIGCHI conference on Human factors in computing systems, p.671-678, April 24-29, 2004, Vienna, Austria [doi>10.1145/985692.985777]
• 3: I. Scott MacKenzie , William Buxton, Extending Fitts' law to two-dimensional tasks, Proceedings of the SIGCHI conference on Human factors in computing systems, p.219-226, May 03-07, 1992, Monterey, California, United States [doi>10.1145/142750.142794]
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• 5: I. Scott MacKenzie , Hedy Kober , Derek Smith , Terry Jones , Eugene Skepner, LetterWise: prefix-based disambiguation for mobile text input, Proceedings of the 14th annual ACM symposium on User interface software and technology, November 11-14, 2001, Orlando, Florida [doi>10.1145/502348.502365]
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INDEX TERMS

Primary Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)

Keywords:
Fitts' law, chording, mobile text entry