The system and its context

A safety case provides an argument iSa i a system is safe to deploy the notion of safe is made precise in suitable claum about the system and its context of deployment, and the argument is intended to substantiate these claims, based on evidence concerning the system and its design and constructioa The approach can be applied recursively, so that substantiated claims about a subsystem can be used as evidence in a parent case. Evalnators examine the case and may certify the system if they are persuaded that the claims are appropriate, the evidence is valid, and the argument is correct. 

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