Reading the Postmortem
A postmortem is a document written by the party with the most to lose from it being read too closely. That does not make it useless; it makes it evidence, to be read the way a good analyst reads any interested account. The facts inside are usually true, because inventing them is too risky. The framing around those facts is where the operator manages your perception, steering you toward luck and away from design. Read the timeline for what it admits against interest, weigh the corrective actions by whether they touch architecture or merely add a checklist, and treat the gaps as data. What a postmortem declines to explain is often the most honest thing in it.
Knowledge check
Why should a reader weight a postmortem's timeline and corrective actions more heavily than its stated summary or root cause?
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The summary is where framing is easiest and least costly, so it is the most managed part of the document. The timeline records specific times and actions that are hard to fabricate and often admit facts against interest, while the corrective actions reveal whether the operator diagnosed a design flaw or is papering over it with process. Both are harder to spin than a prose summary, so they carry more evidentiary weight.