PubMed · 10243217
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Leaving out necessary task steps is the single most common human error type. Certain task steps possess characteristics that are more likely to provoke omissions than others, and can be identified in advance. The paper reports two studies. The first, involving a simple photocopier, established that failing to remove the last page of the original is the commonest omission. This step possesses four distinct error-provoking features that combine their effects in an additive fashion. The second study examined the degree to which everyday memory aids satisfy five features of a good reminder: conspicuity, contiguity, content, context, and countability. A close correspondence was found between the percentage use of strategies and the degree to which they satisfied these five criteria. A three stage omission management programme was outlined: task analysis (identifying discrete task steps) of some safety critical activity; assessing the omission likelihood of each step; and the choice and application of a suitable reminder. Such a programme is applicable to a variety of healthcare procedures.
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