“Customer discovery includes two outside-the-building phases. The first tests customer perception of the problem and the customer’s need to solve it. Is it important enough that the right product will drive significant numbers of customers to buy or engage with the product? The second phase shows customers the product for the first time, assuring that the product (usually a minimum viable product at this point) elegantly solves the problem or fills the need well enough to persuade lots of customers to buy. When customers enthusiastically confirm the importance of both the problem and the solution, customer discovery is complete.”