QAZ Keyboard: QWERTY Based Portrait Soft Keyboard

  • Hiroyuki HakodaEmail author
  • Buntarou Shizuki
  • Jiro Tanaka
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9748)


In this paper, we present a QAZ keyboard, which is a QWERTY keyboard that facilitates one-handed thumb input for a mobile device with a large touchscreen. To design the keyboard, we first conducted experiments to investigate pointing performance on a large mobile touchscreen using one-handed thumb. The results showed that vertically long areas around the center of the touchscreen would be suitable to place a keyboard in terms of accuracy and time of pointing. Based on this finding, we designed and implemented the QAZ keyboard for Android-based devices. A longitudinal study with 4 participants showed that the mean text entry speed was 18.2 wpm, and the mean error rate was 9.1 %. Moreover, a comparative study of the QAZ keyboard compared to a QWERTY keyboard showed that the QAZ keyboard’s error rate was significantly lower than the QWERTY keyboard.


Text entry Software keyboard Virtual keyboard Smartphone Mobile devices Touch screen One-handed interaction One-handed thumb Pointing 


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Hiroyuki Hakoda
    • 1
    Email author
  • Buntarou Shizuki
    • 1
  • Jiro Tanaka
    • 1
  1. 1.University of TsukubaTsukubaJapan

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