Main Takeaways: - The Lean Startup methodology can be a great way to validate product-market fit, but deploying a simple concept test prior to MVP development can save your company huge amounts of time and money. - Concept testing typically takes 2-3 weeks, but significantly reduces the risk of wasting months on an MVP that badly misses the mark. - Concept testing can tell you which customer segments are most likely to adopt your new product, so you know where to focus your MVP efforts.