Module 3 · Qualitative Risk Assessment — ISO 27005 / NIST 800-30 Done Well

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
May 14, 2026
4 min read
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Why this module exists. Most Indian enterprises do qualitative risk assessment — likelihood × impact scoring on a 5×5 matrix — and most do it badly. The matrix becomes a heatmap that decorates board decks. This module covers ISO 27005 and NIST SP 800-30 done well: meaningful scoring scales, calibrated rater training, and the outputs that actually drive decisions.

Why this module exists. Done well, qualitative risk assessment is cheap, repeatable, and good enough for 90% of decisions. Done badly, it is theatre. The difference is in the scoring rigour, not the framework choice.

What ISO 27005 and NIST SP 800-30 actually prescribe

Both frameworks define a process: identify assets, identify threats, identify vulnerabilities, assess likelihood, assess impact, compute risk, treat. The frameworks are loose on the scoring scale — that is the practitioner’s choice, and the choice matters.

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