“…Finding ways to decrease the influence of adverse PSFs can ultimately lead to increase in reliability of operator's performance. In Bellamy's et al (2008) analysis of 8 chemical accidents, using a taxonomy of 850 factors, the factors selection and training, workload, competence, expertise, skills, peoples' capacity have contributed to undesired occurrences in more than 60% of the cases. The selected PSFs for our study were compiled from the set of factors given in HEIST-time, interface, training/experience, procedures, task organisation and task complexity, and the environmental stress and level of burden factors (Clemens, 2002).…”