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    The Effects of Number-related Factors on Entry Performance

    HCI 2014 - Sand, Sea & Sky - Holiday HCI

    Proceedings of the 28th International BCS Human Computer Interaction Conference (HCI 2014)

    Southport, UK, 9 - 12 September 2014


    Huawei Tu, Patrick Oladimeji, Yunqiu Li, Harold Thimbleby & Chris Vincent



    Number entry is ubiquitous in user interface (UI) design, and in many applications - such as finance, aviation, healthcare - here, mitigating errors is critical. This paper examines the effects of factors such as the type of number (e.g., integer or decimal), number length (i.e., short or long) and display position (i.e., near or far) on entry errors. Until now, these factors have not been explored together. Using a touch-based numeric keypad, we found that number length influenced the probability of committing errors, while the position of presentation did not. Number type impacted user-corrected errors but not uncorrected errors. Number length, number type and display position affected input timings. The findings provide implications for the design of both number representations (e.g., decimal point appearance) and the sociotechnical systems that surround them (e.g., training practice).


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