+1 to this response. I'll just add specific questions to ask when you're interviewing specific people about their problems that you believe you will solve. Note

+1 to this response. I'll just add specific questions to ask when you're interviewing specific people about their problems that you believe you will solve. Note that this is not about your solution at all at this point - its about learning whether there is a problem even worth solving. In this interview you are specifically looking to answer the following questions: A. Customer Segments: Who has the pain? • How to identify early-adopters? Ask some introductory questions to collect basic demographics that you believe will drive how you segment and qualify your early adopters. B. Problem: What are you solving? List (up to) the top 3 problem you believe you are solving • How does the interviewee rank the top 3 problems? • What is their pain level for all of these problems: must-have, nice-to-have, don’t-need? • How do customers solve these problems today? – This is generally the heart of the interview as they do a lot of talking and you ask follow up questions based on their responses. You are done when you have interviewed at least 10 people and • can identify the demographics of an early adopter, • have a must-have problem and • can describe how customers solve this problem today If you want to learn more about all of this I suggest picking up Ash Maurya's Running Lean - its the most actionable framework on the Lean Startup methodology that will walk you through step by step from validating your problem to actually having a viable business. Hope that helps.