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How would you measure here the Lead Time when one team takes longer than the other? Do you consider Team B Lead Time to be 5 or 10 days? Measuring one way or the other opens different ways to manage work. I don't add "it depends" option because I know it always depends 😜
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If you consider 5, you actually are measuring when you "finish" the user story, but not when it's delivered to the user. Here you see the team performance in isolation of others. It causes that even though the team is a high performance, the organization isn't. Local maxima
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If you consider 10 days, you might become frustrated. You were fast, but you're depending on other teams to ship it. Causing your metrics to get worse. Yet, I consider the most insightful way to measure Lead Time. It shows team dependencies and, maybe, unclear boundaries
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I'm not saying that you can avoid these situations, but by measuring them this way, you can see how many times it happens and you can take decisions to improve them. Here you are betting for organization performance