Scaling Lean : Mastering the Key Metrics for Startup GrowthIs your big idea worth pursuing? What if you could test your business model earlier in the processbefore youve expended valuable time and resources? Youve talked to customers. Youve identified problems that need solving, and maybe even built a minimum viable product. But now theres 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,