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Error by design: methods for predicting device usability

✍ Scribed by Neville A Stanton; Christopher Baber

Book ID
104288961
Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
197 KB
Volume
23
Category
Article
ISSN
0142-694X

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✦ Synopsis

This paper introduces the idea of predicting 'designer error' by evaluating devices using Human Error Identification (HEI) techniques. This is demonstrated using Systematic Human Error Reduction and Prediction Approach (SHERPA) and Task Analysis For Error Identification (TAFEI) to evaluate a vending machine. Appraisal criteria which rely upon user opinion, face validity and utilisation are questioned. Instead a quantitative approach, based upon signal detection theory, is recommended. The performance of people using SHERPA and TAFEI are compared with heuristic judgement and each other. The results of these studies show that both SHERPA and TAFEI are better at predicting errors than the heuristic technique. The performance of SHERPA and TAFEI are comparable, giving some confidence in the use of these approaches. It is suggested that using HEI techniques as part of the design and evaluation process could help to make devices easier to use.

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