An incident response team recently encountered an unfamiliar type of cyber event.

Performing a post-incident review (also known as a lessons-learned session) is the best way to ensure similar incidents are identified and addressed more efficiently in the future. This review helps in understanding what went wrong, what went right, and how processes can be improved. The knowledge gained from the review can be incorporated into incident response plans and training.

“Post-incident reviews help determine root causes, assess the effectiveness of the response, and identify opportunities for improvement.”

— CISM Review Manual 15th Edition, Chapter 4: Incident Management, Section: Post-incident Analysis

Additionally, the ISACA CISM Practice Question Database emphasizes that post-incident reviews are essential for improving future response times and understanding patterns of threats.