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Watch-top text-entry : can phone-style predictive text-entry work with only 5 buttons?

Dunlop, Mark D. (2004) Watch-top text-entry : can phone-style predictive text-entry work with only 5 buttons? In: Proceedings of the 6th International Symposium on Human Computer Interaction with Mobile Devices and Services (Mobile HCI 2004). Lecture Notes in Computer Science, 3160/2004 . Springer, pp. 342-346. ISBN 978-3-540-23086-1

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This paper presents an initial study into the viability of text entry on a watch face using four alphabetic buttons and a central space key. The study includes a technical evaluation of likely error rates using a large text corpus and user studies on palmtop emulated mobile phone and watch. The results, though in favour of the phone pad, are encouraging and show such a method is feasible.