Safety is an emergent property of systems, not a component property.
What [software] must not do is not the inverse of what it must do. .
Software−related accidents are usually caused by flawed requirements.
Reliability engineers often assume that reliability and safety are synonymous, but this assumption is true only in special cases.
Requirement completeness: Requirements are sufficient to distinguish the desired behavior of the software from that of any other undesired program that might be designed. .
Highly reliable components are not necessarily safe. .
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