Initially, as we’ve pointed out, you’ll use qualitative metrics to measure whether or not the problem you’ve identified is worth pursuing. You start this process by conducting problem interviews with prospective customers. We suggest that you speak with 15 prospective customers to start. After the first handful of interviews, you’ll likely see patterns emerging already. Don’t stop talking to people. Once you get to 15 interviews, you should have the validation (or invalidation) that you need to help clarify the next steps.
