Customer development is the practice of learning from potential customers before and during product development. In principle, it's the most important thing a SaaS founder can do. In practice, most customer development conversations are unfocused, unstructured, and generate more confusion than clarity.
The common failure modes:
Asking about features instead of problems. "Would you want a feature that does X?" always gets a yes. People are polite. They don't want to disappoint you. Feature validation via customer conversations produces a list of "yes" answers that tells you nothing about prioritization.
Talking to the wrong people. Interviews with people who are interested in the topic but don't have the specific problem you're solving produce misleading enthusiasm. You want people who experience the problem regularly and feel pain from the current solution.
Not probing for actual behavior. "Would you pay for this?" is a hypothetical. "How do you currently solve this? How long does it take? What does that cost you?" are behavioral questions. Behavioral answers are much more reliable than hypothetical answers.
The high-signal customer development framework:
Identify a behavioral selection criterion: you want to talk to people who have actively tried to solve this problem in the last 90 days. This filters for active pain vs. theoretical interest.
Use five core questions: (1) How do you currently handle X? (2) Walk me through the last time you did it. (3) What's the worst part? (4) What have you tried that didn't work? (5) If you had a perfect solution, what would it do that your current approach doesn't?
Listen for specificity. Vague problems ("it's kind of inefficient") vs. specific problems ("I spend 3 hours every Monday reconciling these two spreadsheets because the format doesn't match") are different signal quality. Specificity predicts willingness to pay.
Ten sharp interviews beat thirty fuzzy ones. Structure the conversation. Don't pitch.