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      Safer “5–key” number entry user interfaces using Differential Formal Analysis

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      The 26th BCS Conference on Human Computer Interaction (HCI)
      Human Computer Interaction
      12 - 14 September 2012
      Number entry, stochastic simulation, medical devices, interactive systems, blocking errors
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            Abstract

            Differential formal analysis is a new user interface analytic evaluation method based on stochastic user simulation. The method is particularly valuable for evaluating safety critical user interfaces, which often have subtle programming issues. The approach starts with the identification of operational design features that define the design space to be explored. Two or more analysts are required to analyse all combinations of design features by simulating keystroke sequences containing keying slip errors. Each simulation produces numerical values that rank the design combinations on the basis of their sensitivity to keying slip errors. A systematic discussion of the simulation results is performed for assessing the causes of any discrepancy, either in numerical values or rankings. The process is iterated until outcomes are agreed upon. In short, the approach combines rigorous simulation of user slip errors with diversity in modelling and analysis methods. Although the method can be applied to other types of user interface, it is demonstrated through a case study of 5-key number entry systems, which are a common safety critical user interface style found in many medical infusion pumps and elsewhere. The results uncover critical design issues, and are an important contribution of this paper since the results provide device manufacturers guidelines to update their device firmware to make their devices safer.

            Content

            Author and article information

            Contributors
            Conference
            September 2012
            September 2012
            : 29-38
            Affiliations
            [0001]Future Interaction Technology Lab

            Swansea University
            [0002]School of Electronic Engineering and Computer Science

            Queen Mary University of London
            Article
            10.14236/ewic/HCI2012.8
            d329e77b-d05b-462f-986d-cd04cd57afaf
            © Abigail Cauchi et al. Published by BCS Learning and Development Ltd. The 26th BCS Conference on Human Computer Interaction, Birmingham, 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/

            The 26th BCS Conference on Human Computer Interaction
            HCI
            26
            Birmingham, UK
            12 - 14 September 2012
            Electronic Workshops in Computing (eWiC)
            Human Computer Interaction
            History
            Product

            1477-9358 BCS Learning & Development

            Self URI (article page): https://www.scienceopen.com/hosted-document?doi=10.14236/ewic/HCI2012.8
            Self URI (journal page): https://ewic.bcs.org/
            Categories
            Electronic Workshops in Computing

            Applied computer science,Computer science,Security & Cryptology,Graphics & Multimedia design,General computer science,Human-computer-interaction
            Number entry,interactive systems,stochastic simulation,blocking errors,medical devices

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