Instead of instantly switching from the old version of their product by launching the new version, they keep the old version running for almost all users and “launch” the new version to a small percentage of users. Then, they compare key metrics across the new and old versions. Before ramping up the percentage of users who see the new version, the product team wants to make sure the metrics targeted for improvement are performing better and that other key metrics aren't materially worse. This process, called throttling, is a great way to apply Lean principles to reduce risk after you've
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