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ISA‑62443‑1‑3 (99.01.03) [3] uses the foundational requirements (FRs), SRs, REs and the
mapping to SL-Cs as a checklist to test for completeness of the specification of quantitative
metrics. The quantitative security compliance metrics are context specific. Together with
ISA‑62443‑3‑2 (99.03.02), the asset owner’s SL-T assignments are translated into quantitative
metrics that can be used to support system analysis and design trade-off studies, to develop a
security architecture.
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vulnerability score as per CVSS or a similar system for ranking vulnerabilities
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