Human Factor Safety

The ultimate goal would be to design out the inherent hazards or risk. This would consider in some detail the human effort model since humans, by their very presence in the system, interject causal factors. These causal factors go beyond deciding to make mistakes to the limiting factors inherent to humans such as fatigue, physical limits, intellectual factors, etc.

Everything that requires human interaction must be designed around human limits and limitations since there are certain tasks that machines do better than humans, such as constant-pressure or constant-force tasks or fast-repeating tasks over sustained periods. While human limits related to strength, climate, illumination, and visual acuity may be limited, humans have greater flexibility related to mental capacity by being able to change responses, make informed decisions, and take corrective actions.

But humans often require extensive training as the task/response requirements increase in detail or complexity.

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