Which component is NOT part of the human factor in an accident chain?

The correct answer identifies barriers as not being a component of the human factor in an accident chain. The human factors in accidents typically encompass elements that directly relate to human behavior and performance, such as training, attitude, and fatigue.

Training involves the preparation and knowledge that individuals acquire to perform tasks safely and effectively. Attitude influences how personnel approach their jobs, including compliance with safety protocols and teamwork. Fatigue refers to the physical and mental state that can impair an individual's performance and judgment, leading to a higher risk of accidents.

In contrast, barriers generally refer to external factors or systems that are designed to mitigate risks, such as safety devices, equipment, procedures, or policies that provide protection against hazards. These barriers are more about systems and processes rather than human behavior, thus placing them outside the direct scope of human factors affecting an incident. This distinction is important in understanding how accidents can occur and how they can be prevented by focusing on the human elements that contribute to performance and decision-making.