# Customer Discovery Interviews: Questions, Process and Evidence Customer discovery interviews help you understand how potential buyers or users behave before you build. Their value comes from relevant participants, neutral questions, concrete past examples and disciplined analysis—not from asking whether people like your idea. ## The short answer Ask participants to reconstruct recent real events. Explore the problem, consequences, current alternatives, triggers, buying process and barriers. Listen more than you speak, probe without suggesting an answer and compare evidence across interviews before making a decision. ## Customer discovery is research, not a disguised sales call A customer discovery interview examines how a defined person experiences a problem and makes decisions around it. It reveals what happens today: the trigger, workflow, consequences, alternatives, buying criteria, decision-makers and obstacles to change. Interviews can substantially reduce the risk of building around false assumptions. They do not guarantee future sales. Strong validation may combine interview findings with behavioural evidence such as a pilot, pre-sale, procurement step, signed commitment or completed purchase. ## A practical customer discovery interview process 1. Define the commercial decision. 2. List the critical assumptions. 3. Recruit relevant participants. 4. Create a short, semi-structured interview guide. 5. Pilot the guide and remove leading language. 6. Set expectations and obtain consent. 7. Begin broadly, reconstruct specific events and probe without pitching. 8. Document evidence promptly. 9. Compare patterns, differences, exceptions and missing evidence. 10. Connect findings to the decision and next test. ## Customer discovery interview questions Ask about context and role, a recent real event, the problem and its consequences, current alternatives, the buying process, barriers and credible next commitments. Useful probes include: “Can you give me a specific example?”, “What happened next?”, “Who was involved?” and “Is that typical, or was this case unusual?” Avoid asking whether someone would buy the idea, whether it is a good idea or which features they want before understanding the present situation. Ask about actual past behaviour, current spending and workarounds instead. ## Turn interviews into decision-ready evidence Separate observation, interpretation and decision implication. Code evidence across transcripts, compare participant roles and segments, test critical assumptions, retain contradictions and state what remains unresolved. Stronger signals include recent concrete events, costly consequences, active workarounds or spending, a clear buying trigger and a credible next commitment. ## Frequently asked questions ### What is a customer discovery interview? A structured but flexible conversation used to understand actual problems, behaviour, alternatives, constraints and decision processes before committing to a solution. ### What questions should you ask? Ask about a recent real situation: what happened, what triggered action, what the person did, which alternatives they considered, what the consequences were and who influenced the decision. ### How do you avoid leading questions? Use neutral, open wording; ask about past events before future intentions; avoid revealing the answer you hope to hear; and probe both positive and negative evidence. ### How should interviews be analysed? Analyse them systematically across participants, compare roles and segments, retain contradictions and link conclusions to supporting transcript passages. Do not reduce the analysis to a count of positive comments. [Read how to validate a SaaS idea before building an MVP](https://testbeforeyoubuild.com/how-to-validate-a-saas-idea/). [Read how to validate a customer problem before designing the solution](https://testbeforeyoubuild.com/how-to-validate-a-customer-problem/). [Read about leading questions and other sources of customer interview bias](https://testbeforeyoubuild.com/customer-interview-bias/). ## Independent customer discovery The standard Test Before You Build project includes target definition, approximately 30–40 suitable prospects for client approval, recruitment, 20 interviews, transcripts, evidence analysis, a written report, recommended changes and a BUILD, CHANGE or KILL recommendation. Fixed price: €2,900 + VAT. Typical timeline: approximately 2–4 weeks. Larger and multi-segment projects can be scoped separately. [See market validation services and pricing](https://testbeforeyoubuild.com/market-validation-services-pricing/) or [submit your idea](https://testbeforeyoubuild.com/#contact). ## Author Dr. Kari Jääskeläinen is an entrepreneur, business leader and consultant with experience in market validation, technology commercialisation, business development and sales. He has worked on around 200 commercialisation and consulting projects and has made approximately 2,000 sales calls a year. [Read about Dr. Kari Jääskeläinen](https://testbeforeyoubuild.com/about-kari-jaaskelainen/). ## Sources - Harvard Business School Rock Center for Entrepreneurship: [Customer Discovery Basics](https://entrepreneurship.hbs.edu/Documents/Session%20Summary/HBSRock-Customer-Discovery-Final.pdf) - DeJonckheere and Vaughn (2019): [Semistructured interviewing in primary care research](https://pmc.ncbi.nlm.nih.gov/articles/PMC6910737/) - Kallio et al. (2016): [Developing a framework for a qualitative semi-structured interview guide](https://pubmed.ncbi.nlm.nih.gov/27221824/) - Moser and Korstjens (2018): [Practical guidance to qualitative research, Part 3](https://pmc.ncbi.nlm.nih.gov/articles/PMC5774281/)