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ISACA Certified Information Security Manager (CISM) 2026 exam content outline · Domain 4: Incident management

Post-incident review and lessons learned

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Last reviewed September 30, 2026 · Leer en español

The post-incident review, also called lessons learned or an after-action review, is the last phase of incident response and one of the most valuable. Its purpose is to improve: to find what worked, what did not, and what should change so that similar incidents are less likely or less harmful in future. An incident is expensive; the review is how the organization gets some value back from that cost.

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