A system can be 100% reliable (always conforming to its specification) and still be unsafe. What is a primary reason for this?

Question

Accepted Answer

The system specification may be incomplete and fail to describe the correct behavior for a rare but critical situation.

Answer

The hardware components it runs on are inherently unsafe.

Answer

Reliability is measured by uptime, whereas safety is measured by the number of bugs.

Answer

System operators are not considered part of the safety-critical system.

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