BigKey: A Virtual Keyboard for Mobile Devices

  • Khaldoun Al Faraj
  • Mustapha Mojahid
  • Nadine Vigouroux
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5612)


This paper describes BigKey virtual keyboard for mobile devices, designed to make the keys of virtual keyboard easier to acquire. The tiny size of keys makes efficient selection difficult. To overcome this drawback, we propose to expand key size that corresponds to next character entry. The proposed solution helps to facilitate the selection task by expanding the next entry. Moreover the prediction system reduces the visual scanning time to find letters that one is looking for. Users’ performance study showed that they were 25.14% faster and more accurate with BigKey virtual keyboard than with normal virtual keyboard.


Virtual keyboard text input PDAs expanding targets letter prediction 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Khaldoun Al Faraj
    • 1
  • Mustapha Mojahid
    • 1
  • Nadine Vigouroux
    • 1
  1. 1.University of Toulouse, IRITToulouseFrance

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