This paper reports a study carried out on the perceptions of supervisors, technicians and operators of the procedures for seven safety-critical activities. Using a questionnaire in which the subjects rated a variety of attributes, and ranked the different procedures in terms of dangerousness, controllability, susceptibility to violation, a mental model was constructed within which the different procedures can be placed. It was found that there are few differences between supervisors and operators, but where there are these probably relate to the time-scale over which control is exerted. The rated quality of procedures was found not to be related to the perceived Susceptibility to violation. One important finding was that, contrary to the expectations of safety management systems designers, concurrent operation were rated as both less dangerous and more controllable. The conclusion is that such techniques can uncover major differences between how the workforce see procedures and how management believes they are being used.
fax 01-972-952-9435. AbstractThis paper reports a study carried out on the perceptions of supervisors, technicians and operators of the procedures for seven safety-critical activities. Using a questionnaire in which the subjects rated a variety of attributes, and ranked the different procedures in terms of dangerousness, controllability, susceptibility to violation, a mental model was constructed within which the different procedures can be placed. It was found that there are few differences between supervisors and operators, but where there are these probably relate to the timescale over which control is exerted. The rated quality of procedures was found not to be related to the perceived susceptibility to violation. One important finding was that, contrary to the expectations of safety management systems designers, concurrent operations were rated as both less dangerous and more controllable. The conclusion is that such techniques can uncover major differences between how the workforce see procedures and how management believes they are being used.
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