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<Paper uid="C02-1149">
  <Title>Entering Text with A Four-Button Device</Title>
  <Section position="9" start_page="3" end_page="3" type="concl">
    <SectionTitle>
7 Conclusion
</SectionTitle>
    <Paragraph position="0"> Wehave presented TouchMeKey4, a text entry device that requires only four buttons, and aspects of its design and testing. Several characters of the alphabet are assigned to each of four buttons and the user enters a document with the aid of a predictive text-entry system. The device is realized by software that estimates the word that most probably corresponds with the user input. The estimate is based on an adaptivestatistical language model. Firstly, a base model is constructed from a large body of text from newspapers;; the model is then adapted to the local context by using a smaller user corpus of 10 thousand words.</Paragraph>
    <Paragraph position="1"> Our evaluation shows that text entry with this system is as ecient as text entry on a mobile phone.</Paragraph>
    <Paragraph position="2"> The number of keystrokes is reducible to a number below that required on a full keyboard. The average speed of our test subjects was 14 words per minute, and the fastest subject recorded 23 wpm. We also discussed the possibilityofentering text via even fewer keys, e.g., three keys. However, the usability of a three-key device turned out to be questionable, because the number of keys needed to enter text becomes large.</Paragraph>
    <Paragraph position="3"> Our future direction will be to investigate the actual application of the system on smaller machines and to develop a text-entry system for use by elderly and disabled people.</Paragraph>
  </Section>
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