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Risk of Machines

Human life is the target of machine risk field. Mainly, physical risk. The target is the people operate vehicles, machines in factories.

Human Error

Human error is caused by human. But the study for human error does not consider the cause as a human fault. It tries to find the cause in the condition around the people. It classifies factors in the operation. There are some classification methods. For example, the reasoning along time axis.

Risk is often explained as a probability problem. But human error risk is explained as an inevitable problem.

Fail-safe Structure

In reliability engineering ,life and trouble are evaluated. Design for long life is important. But there is a limit.

Fail-safe structure is a design that, at least human life is saved when there is a trouble.

Fail-safe structure is useful concept for various risks to reduce the damage.

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