“First, collaboration is built on relationships, and product teams—especially co‐located teams—are designed to nurture these relationships. Second, to innovate you need expertise, and the durable nature of product teams lets people go deep enough to gain that expertise. Third, instead of just building what others determine might be valuable, in the product team model the full team understands—needs to understand—the business objectives and context. And most important, the full team feels ownership and responsibility for the outcome.”