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It is believed that product managers should help a company do something that makes sense and advise against doing something that doesn’t. Product managers focus the team on action items that bring value to the business, items that users like and increase sales. This is similar to the Lean approach, and most of the product managers I know share that approach. The process of passing the hypothesis from the ‘Idea’ stage to the “Done” stage is called Lead Time. And it is the most important metric to optimize, if you are a startup that is looking for a product/ market fit.