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Regional Basic Professional Training Course in Korea

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B. Model of Mistake<br />

11. Human Performance: A Perspective on Human Factors<br />

Figure 11.1 shows the graphical model of violation. Although the person has a good<br />

understand<strong>in</strong>g of the “prescribed task”, he/she develops an <strong>in</strong>tention not <strong>in</strong> compliance<br />

with his/Figure 11.4 shows the graphical model of mistakes. The <strong>in</strong>tention is wrong or the<br />

<strong>in</strong>strumental <strong>in</strong>tention is not appropriate, because the understand<strong>in</strong>g is not <strong>in</strong> compliance<br />

with the “prescribed task”. This can be expla<strong>in</strong>ed by the total or partial ignorance of the<br />

operator due to <strong>in</strong>ternal or external factors.<br />

Internal factors could be described by the follow<strong>in</strong>g facts:<br />

Incompetence of the operator, who failed to understand or to recognize the task, or<br />

failed to determ<strong>in</strong>e how to use, or to use the tools needed for achiev<strong>in</strong>g the<br />

objective.<br />

Forgetfulness (especially when situations occur <strong>in</strong>frequently or are unplanned).<br />

External factors could be described by the follow<strong>in</strong>g facts:<br />

Task is poorly def<strong>in</strong>ed because even the experts understand it poorly, or it is<br />

<strong>in</strong>sufficiently def<strong>in</strong>ed with respect to the knowledge of the worker who will<br />

perform it.<br />

Task is performed <strong>in</strong> conflict<strong>in</strong>g situations. It is possible that the organization has<br />

solutions for these conflicts, but these have not been clarified.<br />

The conflicts between speed and accuracy, and quality and quantity need more<br />

knowledge to be performed correctly. Insufficient tra<strong>in</strong><strong>in</strong>g has been provided to the<br />

<strong>in</strong>dividuals who have to perform the task. When the analysis shows clearly (or by<br />

deduction) that the persons concerned did not understand the procedures, the<br />

❙ 715 ❙

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