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How to Run Customer Interviews That Actually Validate Your Startup Idea

newtonsquareco
November 08, 2025
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How to Run Customer Interviews That Actually Validate Your Startup Idea

Most founders skip validation or ask leading questions. Learn the Mom Test framework for customer interviews that reveal the truth.

The Critical Mistake Most Founders Make

Here's a hard truth: 90% of startups fail, and the number one reason is "no market need." Yet most founders skip the most crucial step in validation—talking to real customers.

Why? Because customer interviews feel awkward, time-consuming, and honestly, a little scary. What if people hate your idea? What if you've been working on something nobody wants?

But here's the even harder truth: Skipping customer interviews guarantees failure. Building something nobody wants is far more painful than hearing "no" early.

What is The Mom Test?

Author Rob Fitzpatrick coined the term "The Mom Test" based on a simple principle: Your mom will lie to you to make you feel good. If you ask her if your startup idea is good, she'll say yes—even if it's terrible.

The Mom Test framework teaches you to ask questions that even your mom can't lie to you about. Instead of asking for opinions, you ask about past behavior and specific problems.

The 3 Rules of Customer Interviews

Rule #1: Talk About Their Life, Not Your Idea

Don't pitch your idea. Don't explain your vision. Instead, ask about their current struggles, workflows, and pain points.

Rule #2: Ask About Specifics in the Past Instead of Generalities About the Future

Humans are terrible at predicting their future behavior. Past behavior is the best predictor of future behavior.

Rule #3: Talk Less and Listen More

The best customer interviews feel like a conversation where the customer does 80% of the talking.

The 10 Essential Customer Interview Questions

  1. "Tell me about how you currently solve this problem?"
  2. "What's the hardest part about [problem area]?"
  3. "Can you tell me about the last time that happened?"
  4. "What have you tried before to solve this?"
  5. "How much time/money does this problem cost you?"
  6. "If you could wave a magic wand and fix one thing, what would it be?"
  7. "Walk me through a typical day when you deal with this problem."
  8. "Who else is involved in solving this problem?"
  9. "What would have to happen for you to switch from your current solution?"
  10. "What did you like and dislike about [existing solution]?"

How to Find People to Interview

1. Your Existing Network

Send personal messages to friends, family, colleagues who fit your target customer profile.

2. LinkedIn Outreach

Search for people with specific job titles in your target market.

3. Online Communities

Join Reddit communities, Facebook groups, Slack channels where your target customers hang out.

Download Your Free Customer Interview Template

Ready to Validate Your Startup Idea?

Download our free Customer Interview Template and start having meaningful conversations today.

Download Free Template →

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About the Author

Aether Team · We help entrepreneurs validate and launch successful startups using proven frameworks and AI-powered tools.

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