" successful startup solves this conundrum by focusing its development on building the product incrementally and iteratively and targets its early selling efforts on a very small group of early customers who have bought into the startup’s vision. This small group of visionary customers will give the company the feedback necessary to add features into follow-on releases. Enthusiasts for products who spread the good news are often called evangelists. But we need a new word to describe visionary customers—those who will not only spread the good news about unfinished and untested products, but also buy them. I call them earlyvangelists.2 "

― Steve Blank , The Four Steps to the Epiphany: Successful Strategies for Startups That Win