Prototype Before Commitment. Testing a Business Idea With Customers

Business ideas become expensive when founders build certainty into the product before testing whether customers care. This guide presents rapid prototyping as a commercial learning process, not merely a design technique. It covers problem interviews, promise tests, manual delivery, landing pages, preorders, small pilots, pricing conversations, and evidence thresholds. Readers learn how to choose the cheapest credible test, gather behavior rather than compliments, and move from concept to a first paying customer without pretending the business is already finished.