How to run a UX postmortem: A practical six-step framework

UX postmortems are lightweight post-launch reviews that compare a team’s original design assumptions with real user behavior, helping distinguish sound decisions from fortunate or poor outcomes influenced by changing conditions. Rather than relying solely on adoption or completion metrics, teams should combine analytics, usability research, support feedback, session recordings, and customer-facing insights to understand both what happened and why, while recognizing remaining uncertainty. The approach treats design choices as hypotheses that should be documented before release, including the problem, supporting evidence, expected user behavior, and intentional trade-offs. After launch, teams can revisit these assumptions, identify unexpected behaviors or results, investigate their causes, and convert observations into reusable principles for future work. The process should be proportional to a feature’s impact and uncertainty, ranging from a brief discussion for small interactions to deeper analysis for major workflows, and lessons should be stored in an accessible format. By regularly reviewing shipped work while guarding against confirmation bias, design teams can improve predictions, preserve institutional knowledge, and make future decisions less dependent on intuition alone.

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