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Errors in number entry – a taxonomy
Incorrect drug doses are a common medical error. Using a set of number entry errors gathered last year, we have created a taxonomy which lists the varying types of errors collected and groups them by potential cause and at what point they occur during the number entry process. Entry errors can occur when a number is misread from a prescription, when digits get jumbled up in memory before typing, or when actually pressing the buttons on a keypad. From this initial taxonomy we can investigate whether some errors are more likely at certain stages of number entry and begin to understand their causes.
Wiseman, S., Cairns, P., COX, A. (2011). A Taxonomy of Number Entry Errors. HCI2011: The 25th BCS Conference on Human-Computer Interaction. Author URL
Recovering from interruptions
Hospital wards are busy places, and medical professionals conducting routine tasks, such as setting up an infusion pump, are likely to find themselves interrupted at some point in the sequence. We have been investigating ways to reduce cognitive slips caused by interruptions, such as exploring the value of encouraging users to stop and think before resuming a task following an interruption. Findings suggest that the process of retracing previously achieved sub-goals can help with resuming a task. Ways of encouraging people to take time before resuming their task rather than jumping straight back in have been tested. In addition to demonstrating that people make speed/accuracy tradeoffs when resuming after an interruption, we are also investigating whether we can predict from eye-movement data if someone will make an error. Ultimately, as this work matures it will allow us to make predictions about device designs that better support error avoidance.
Back, J., Brumby, D. P., Cox, A. L. (2010). Locked-out: Investigating the effectiveness of system lockouts to reduce errors in routine tasks. Proceedings of the 28th international conference extended abstracts on human factors in computing systems, CHI EA ’10. ( pp.3775-3780). New York, NY: ACM Press. Author URL Publisher URL
