Is your "big idea" worth pursuing? What if you could test your business model earlier in the process - before you've expended valuable time and resources? You've talked to customers. You've identified problems that need solving, and maybe even built a minimum viable product. But now there's a second bridge to cross. How do you tell whether your idea represents a viable business? Do you really have to go through the whole cycle of development, failure, iteration, tweak, repeat? Scaling Lean offers an invaluable blueprint for mod-eling startup success. You'll learn the essential metrics that measure the output of a working business model, give you the pulse of your company, communicate its health to investors, and enable you to make precise interventions when things go wrong. You'll also learn how . ballpark the viability of a business model using a simple five-minute back-of-the-envelope estimation.. stop using current revenue as a measure of progress (it forces you to fly blind and, often, to overpromise to your shareholders) and instead embrace the met-ric of traction - which helps you identify the leading indicators for future business model growth.. set progressive goals that set you up for exponen-tial long-term success by implementing a staged 10X rollout strategy, like one employed by Face-book and Tesla.. stop burying your breakthrough insights in failed experiments, but rather illuminate them using two-week LEAN sprints to quickly source, rank, and test ideas. Ash Maurya, a serial entrepreneur and author of the startup cult classic Running Lean , pairs real-world examples of startups like Airbnb and Hubspot with techniques from the manufacturing world in this tacti-cal handbook for scaling with maximum efficiency and efficacy. This is vital reading for any startup founder graduating from the incubator stage.