The human factors approach relies on understanding the properties of human capability and limitations under various conditions and the application of that knowledge in designing and developing safe systems. Following the principles of MTO (Man Technology Organization) approach, emphasis should be given to the way people interact with technical as well as organizational systems. A model describing human factor influences in relation to the performance shaping factors and their effect on the manual ultrasonic inspection performance had been built and a part of it empirically tested. The experimental task involved repeated inspection of 18 flaws according to the standard procedure under no, middle and high time pressure. Stress coping strategies, mental workload of the task, stress reaction and organizational factors have been measured. The results have shown that time pressure, mental workload and experience influence the quality of the inspection performance. Organizational factors and their influence on the inspection results were rated as important by the operators. However, further research is necessary into the effects of stress.
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