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      The Effects of Number-related Factors on Entry Performance

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

      BCS Human Computer Interaction Conference (HCI 2014)

      9 - 12 September 2014

      Number entry, number-related factors, entry errors, user performance

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          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          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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          Most cited references 12

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          The magical number seven plus or minus two: some limits on our capacity for processing information.

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            Investigating touchscreen typing: the effect of keyboard size on typing speed

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              Standing at a kiosk: effects of key size and spacing on touch screen numeric keypad performance and user preference.

               Keith Hiszem,  H Colle (2004)
              Touch screen input keys compete with other information for limited screen space. The present study estimated the smallest key size that would not degrade performance or user satisfaction. Twenty participants used finger touches to enter one, four or 10 digits in a numeric keypad displayed on a capacitive touch screen, while standing in front of a touch screen kiosk. Key size (10, 15, 20, 25 mm square) and edge-to-edge key spacing (1, 3 mm) were factorially combined. Performance was evaluated with response time and errors, and user preferences were obtained. Spacing had no measurable effects. Entry times were longer and errors were higher for smaller key sizes, but no significant differences were found between key sizes of 20 and 25 mm. Participants also preferred 20 mm keys to smaller keys, and they were indifferent between 20 and 25 mm keys. Therefore, a key size of 20 mm was found to be sufficiently large for land-on key entry.
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                Author and article information

                Contributors
                Conference
                September 2014
                September 2014
                : 246-251
                Affiliations
                FIT Lab, University of Swansea

                Singleton Park, Swansea, U.K.
                UCL Interaction Centre

                Gower St, London. U.K.
                10.14236/ewic/HCI2014.39
                © Huawei Tu et al. Published by BCS Learning and Development Ltd. Proceedings of the 28th International BCS Human Computer Interaction Conference (HCI 2014), Southport, UK

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Proceedings of the 28th International BCS Human Computer Interaction Conference (HCI 2014)
                HCI
                28
                Southport, UK
                9 - 12 September 2014
                Electronic Workshops in Computing (eWiC)
                BCS Human Computer Interaction Conference (HCI 2014)
                Product
                Product Information: 1477-9358 BCS Learning & Development
                Self URI (journal page): https://ewic.bcs.org/
                Categories
                Electronic Workshops in Computing

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