The best validation interview questions focus on past behavior, current pain, and existing solutions. Key questions: 'Tell me about the last time you experienced [problem]? ', 'What do you currently do to solve this? ', 'What's the hardest part? ', 'How much time/money does this cost you?
- 5-7
- core questions per interview — IdeaProof Research 2026
- 80%
- time customer should talk — IdeaProof Research 2026
- 0
- yes/no questions ideal — IdeaProof Research 2026
- 3
- follow-up 'why' probes — IdeaProof Research 2026
- 15-30
- interviews for patterns — IdeaProof Research 2026
The best validation interview questions focus on past behavior, current pain, and existing solutions. Key questions: 'Tell me about the last time you experienced [problem]?', 'What do you currently do to solve this?', 'What's the hardest part?', 'How much time/money does this cost you?' Avoid: 'Would you buy this?' or 'Do you like this idea?'
Key Validation Interview Questions Takeaways
- Problem Discovery: 'Tell me about the last time you dealt with [problem area]?'
- Pain Quantification: 'How often does this happen? How much time/money does it cost?'
- Current Solutions: 'What do you currently do to handle this? What have you tried?'
- Failed Solutions: 'What didn't work about solutions you've tried? Why did you stop using them?'
- Decision Process: 'Who else is involved in choosing solutions? What's your budget?'
- Workflow Context: 'Walk me through your typical day/week. Where does this problem fit?'
- Emotional Probes: 'What's the most frustrating part? What would make your life easier?'
- Priority Assessment: 'If you could wave a magic wand, what would you fix first?'
- Competitive Intelligence: 'What tools/solutions do you use daily that you love? Why?'
- Referral Mining: 'Who else deals with this problem? Who should I talk to?'
Real-World Validation Interview Questions Examples
Slack
Early interviews focused on 'How does your team communicate now? What falls through the cracks?' Not 'Would you use a chat app?' They discovered email was hated but alternatives failed because of fragmented notifications. This insight shaped Slack's core product.
Calendly
Tope Awotona asked 'Walk me through how you schedule meetings.' People described painful email chains averaging 8+ back-and-forths. He quantified the pain (time wasted) and validated there was no good solution in use. The problem was specific and measurable.
Notion
Ivan Zhao asked 'How do you currently organize your work and notes?' He discovered people used 5+ different tools poorly rather than one tool well. The pain wasn't any single tool - it was fragmentation. This insight shaped Notion's all-in-one approach.
Expert Validation Interview Questions Insights
"Opinions are worthless. Only facts about what people have done in the past can tell you what they'll do in the future."
"Ask about their life, not your idea. The more you talk about your idea, the less useful the conversation."
"The goal of customer development is not to get people to tell you your idea is great. It's to learn whether you have a business."
Validation Interview Questions FAQ
Sources & Citations
- [1]IdeaProof Research 2026
Cite this page
IdeaProof. (2026). What Questions Should I Ask in Customer Validation Interviews?. IdeaProof. Retrieved from https://ideaproof.io/questions/validation-interview-questionsLast verified: