Blameless Postmortems

Blameless Postmortems

Overview

The goal of a postmortem is learning and improvement. Blame reduces psychological safety and hides valuable information.

When to Use

• After production incidents
• After significant near-misses
• When a surprising failure mode is discovered

Core Process

1. Timeline of what happened (facts first)
2. Impact assessment
3. Contributing factors and systemic causes (not “who failed”)
4. What went well / what helped
5. Action items with owners and due dates
6. Follow-up to ensure actions are completed

Principles

• Assume people acted with the information and tools they had at the time
• Look for latent conditions and missing defenses
• Make action items specific, owned, and tracked
• Share learnings widely so the same incident is less likely elsewhere

Verification

• Postmortem produces concrete, tracked improvements
• Participants feel safe to share what they actually observed
• Similar incidents become less frequent or less severe over time