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Conference Paper

Improving Two-thumb Text Entry on Touchscreen Devices

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Oulasvirta,  Antti
Computer Graphics, MPI for Informatics, Max Planck Society;

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Reichel,  Anna
Computer Graphics, MPI for Informatics, Max Planck Society;

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Li,  Wenbin
Computer Graphics, MPI for Informatics, Max Planck Society;

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Zhang,  Yan
Computer Graphics, MPI for Informatics, Max Planck Society;

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Bachynskyi,  Myroslav
Computer Graphics, MPI for Informatics, Max Planck Society;

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Citation

Oulasvirta, A., Reichel, A., Li, W., Zhang, Y., Bachynskyi, M., Vertanen, K., et al. (2013). Improving Two-thumb Text Entry on Touchscreen Devices. In S. Bødker, S. Brewster, P. Baudisch, M. Beaudouin-Lafon, & W. E. Mackay (Eds.), CHI 2013 (pp. 2765-2775). New York, NY: ACM. doi:10.1145/2470654.2481383.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-3E5B-5
Abstract
We study the design of split keyboards for fast text entry with two thumbs on mobile touchscreen devices. The layout of KALQ was determined through first studying how users should grip a device with two hands. We then assigned letters to keys computationally, using a model of two-thumb tapping. KALQ minimizes thumb travel distance and maximizes alternation between thumbs. An error correction algorithm was added to help address linguistic and motor errors. Users reached a rate of 37 words per minute (with a 5% error rate) after a training program.