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There are five reasons, I believe, to do postmortems. The first two are fairly obvious, the next three less so.
Consolidate What’s Been Learned
While it is true that you learn the most in the midst of a project, the lessons are not generally coherent. Any individual can have a great insight but may not have the time to pass it on. A process might be flawed, but you don’t have time to fix it under the current schedule. Sitting down afterward is a way of consolidating all that you’ve learned - before you forget it. Postmortems are a rare opportunity to do analysis that simply wasn’t possible in the heat of the project.
Teach Others Who Weren’t There
Even if everyone involved in a production understands what it taught them, the postmortem is a great way of passing on the positive and negative lessons to other people who were not on the project. So much of what we do is not obvious - the result of hard-won experience. Then again, some of what we do doesn’t really make sense. The postmortem provides a forum for others to learn or challenge the logic behind certain decisions.
Don’t Let Resentments Fester
Many things that go wrong are caused by misunderstandings or screw-ups. These lead to resentments that, if left unaddressed, can fester for years. But if people are given a forum in which to express their frustrations about the screw-ups in a respectful manner, then they are better able to let them go and move on. I have seen many cases where hurt feelings lingered far after the project, feelings that would have been worked through much more easily if they had been expressed in a postmortem.
Use the Schedule to Force Reflection
I favor principles that lead you to think. Postmortems - but also other activities such as Braintrust meetings and dailies - are all about getting people to think and evaluate. The time we spend getting ready for a postmortem meeting is as valuable as the meeting itself. In other words, the scheduling of a postmortem forces self-reflection. If a postmortem is a chance to struggle openly with our problems, the “pre-postmortem” sets the stage for a successful struggle. I would even say that 90 percent of the value is derived from the preparation leading up to the postmortem.
Pay It Forward
In a postmortem, you can raise questions that should be asked on the next project. A good postmortem arms people with the right questions to ask going forward. We shouldn’t expect to find the right answers, but if we can get people to frame the right questions, then we’ll be ahead of the game.