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So, you\u2019ve found product market fit and you\u2019re starting to acquire users. But it\u2019s not enough to just have users \u2013 you need to make sure they\u2019re sticking around and keep finding value in your product. How do you measure and track user engagement and retention? a16z general partners Andrew Chen (formerly of Uber and author of the book, The Cold Start Problem) and Jeff Jordan (formerly of OpenTable, eBay) dig into the two key elements for any growth strategy: engagement and retention.