Postmortem Culture: Learning from Failure (SRE Book, ch. 15)
https://sre.google/sre-book/postmortem-culture/
Method
none stated
Population
none stated
What it does not show
The chapter’s outcome claim — that thanks to postmortem culture “Google weathers fewer outages and fosters a better user experience” — is asserted with no baseline, no recurrence rate and no trend data. What would settle it is a tracked recurrence rate for postmortem action items, or an incident-rate trend correlated with adoption.
John Lunney, Sue Lueder
Defines the practice: “For a postmortem to be truly blameless, it must focus on identifying the contributing causes of the incident without indicting any individual or team for bad or inappropriate behavior.”
Tier IV: House-style practitioner guidance. Its one outcome claim is an explicit bare assertion with no cited data, figure or comparison anywhere in the chapter.