Customer Interviews

Customer Interviews: Talking to the People Who Matter

You have got a business idea. You think it is brilliant. But here is the thing — your opinion does not matter nearly as much as your customers' opinions. The fastest way to find out if your idea will work is to talk to real people who might actually buy it.

Customer interviews are structured conversations with potential buyers. They are not sales pitches. They are not surveys. They are genuine, curious conversations designed to uncover the truth about whether people need what you are building.

Why Interviews Beat Surveys

You might be thinking "Can I just send out a Google Form?" Surveys have their place, but interviews are far more powerful because:

• You can follow up — when someone says something interesting, you can dig deeper
• You read body language — hesitation, excitement, and confusion are invisible in a survey
• You discover surprises — people will tell you things you never thought to ask about
• You get richer data — a five-minute conversation reveals more than 20 tick-box answers
• You build relationships — interviewees often become your first customers

How Many People Should You Interview?

For a teen business, 10-20 interviews is the sweet spot.

• Fewer than 10: You might just be hearing individual opinions, not patterns
• 10-15: Enough to spot clear patterns and common themes
• 15-20: Very strong confidence in your findings
• More than 20: Diminishing returns — you will keep hearing the same things

You will know you have done enough when you start hearing the same answers repeatedly. Researchers call this "saturation."

Who to Interview

This is critical. You must interview people who match your target customer, not just whoever is convenient.

Good interviewees:

• People who fit your buyer persona (age, interests, budget)
• People who currently spend money solving the problem you address
• People who have recently bought something similar
• Strangers or acquaintances (less likely to spare your feelings)

Bad interviewees:

• Your mum, dad, or best friend (too biased)
• People who would never buy your type of product
• Only people from your own friend group (too narrow)
• People you are trying to impress

Where to find interviewees:

• Classmates in different year groups
• Students at other schools (if you can reach them)
• People at local markets, shops, or events
• Online communities related to your product area
• Friends of friends (one degree of separation reduces bias)

The Golden Rules of Customer Interviews

Before you start asking questions, memorise these rules:

#### Rule 1: Never Pitch Your Idea First

The moment you explain your idea, you pollute the conversation. People will react to your idea instead of sharing their genuine problems and needs.

Wrong: "I am making eco-friendly phone cases from recycled materials. What do you think?"

Right: "I am interested in how people choose phone cases. Can I ask you a few questions about that?"

Only reveal your specific idea at the very end, if at all.

#### Rule 2: Ask About the Past, Not the Future

People are terrible at predicting their own future behaviour. Asking "Would you buy this?" gets unreliable answers. Instead, ask about what they have already done.

Wrong: "Would you pay £5 for a healthy snack?"

Right: "Tell me about the last snack you bought. Where did you get it, and why did you choose that one?"

Past behaviour is the best predictor of future behaviour.

#### Rule 3: Shut Up and Listen

The interviewee should be talking 80% of the time. Your job is to ask a question and then be quiet. Resist the urge to fill silences — often the best insights come after a pause.

#### Rule 4: Follow the Emotion

When someone gets excited, frustrated, or passionate about something, dig deeper. Emotion signals something important.

"You seem really frustrated about that — can you tell me more?"

#### Rule 5: Do Not Lead the Witness

Leading questions push people towards the answer you want to hear.

Leading: "Do you not think school lunches are terrible?" (You are telling them what to think)

Neutral: "How do you feel about the lunch options available to you?"

The Interview Script: What to Ask

Here is a proven structure for a 15-20 minute customer interview. Adapt it to your specific product area.

#### Opening (2 minutes)

• "Thanks for chatting with me. I am researching [topic area] to understand how people like you deal with [general problem]. There are no right or wrong answers — I just want to hear about your experience."
• "Is it okay if I take notes?"

#### Understanding Their World (5 minutes)

• "Can you walk me through a typical [situation related to your product]?"
• "What is the hardest part about [relevant activity]?"
• "How do you currently handle [the problem your product solves]?"

#### Exploring the Problem (5 minutes)

• "Tell me about the last time [the problem] happened. What did you do?"
• "What have you tried in the past to solve this? What worked and what did not?"
• "If you could wave a magic wand and fix one thing about [this area], what would it be?"
• "How much time/money do you currently spend dealing with this?"

#### Testing Willingness to Pay (3 minutes)

• "When you bought [similar product], how much did you pay? Did that feel like good value?"
• "What would make something like this worth paying more for?"
• "If a solution existed that [briefly describe the benefit, not your product], roughly what would you expect to pay?"

#### Wrapping Up (2 minutes)

• "Is there anything else about [topic] that I should know about?"
• "Do you know anyone else who struggles with this that I could talk to?" (Great way to find more interviewees)
• "Thanks so much — this has been really helpful."

Avoiding Bias: The Silent Killers

Bias is anything that distorts your findings and gives you a false picture. Here are the most dangerous types and how to avoid them:

#### Confirmation Bias

What it is: Only hearing things that support your idea and ignoring things that contradict it.

How to avoid it: Actively look for negative signals. After each interview, write down one thing that worried you or challenged your assumption.

#### Social Desirability Bias

What it is: People telling you what they think you want to hear, especially face-to-face.

How to avoid it: Make it safe to give negative feedback. Say "I really appreciate honest feedback — it helps me avoid making mistakes." And interview people who have no reason to spare your feelings.

#### Selection Bias

What it is: Only interviewing people who are likely to agree with you (your friends, your social circle).

How to avoid it: Deliberately seek out people outside your immediate circle. Interview people of different ages, backgrounds, and opinions.

#### Anchoring Bias

What it is: The first piece of information someone hears influences everything after it.

How to avoid it: Do not mention prices, features, or your idea before asking open questions. Let them give you their perspective first.

Recording and Organising Insights

During or immediately after each interview, capture:

• Key quotes — Write down interesting things word-for-word. These are gold for understanding customer language.
• Pain points mentioned — What problems came up?
• Current solutions — How are they handling the problem now?
• Emotional moments — What made them excited, frustrated, or surprised?
• Willingness to pay signals — Any clues about pricing?
• Surprises — Anything you did not expect to hear.

#### The Interview Summary Template

After each interview, fill in this quick summary:

• Interviewee: [First name, age, brief description]
• Top problem: [The biggest frustration or need they expressed]
• Current solution: [How they deal with it now]
• What they would pay for: [Any indication of willingness to pay]
• Key quote: [The most revealing thing they said]
• Surprise: [Something you did not expect]

Spotting Patterns: When You Have Done 10+ Interviews

After 10 interviews, lay out all your summaries and look for patterns:

• What problems came up most often? (If 7 out of 10 people mention the same frustration, that is a strong signal)
• What solutions are people already using? (This tells you your competition)
• What language do they use? (Use their words in your marketing, not yours)
• What would they pay? (Look for price clustering)
• Were there any deal-breakers? (Things that would prevent them from buying)

Validation Criteria: Is Your Idea Validated?

After completing your interviews, use this scorecard:

Strong validation: Most signals fall in the "Strong" column. Proceed with confidence.

Mixed signals: Some strong, some weak. You might need to refine your idea or target a different customer segment.

Red flags: Multiple signals in the "Red Flag" column. Pause and reconsider. The idea may need a major pivot or might not be viable.

Common Mistakes in Customer Interviews

Talking too much. This is the number one mistake. If you are talking more than 20% of the time, you are doing it wrong.

Asking hypothetical questions. "Would you...?" questions get unreliable answers. Ask about real, past behaviour instead.

Only interviewing people who are easy to reach. Push yourself to find diverse interviewees.

Not taking notes. You will forget 80% of what was said within 24 hours. Write it down during or immediately after.

Stopping after 3-4 interviews. You need 10+ to spot reliable patterns. Keep going.

Interpreting politeness as validation. "That sounds nice" is not the same as "I would buy that." Look for strong signals, not polite interest.

Putting It Into Practice

Here is your action plan:

• This week: Identify 12-15 people to interview who fit your target market
• Next 2 weeks: Complete 10-12 interviews using the question framework above
• After interviews: Create summaries, spot patterns, and score your idea against the validation criteria
• Decision time: Based on your findings, decide whether to proceed, pivot, or try a different idea

Remember: the goal is not to prove your idea is good. The goal is to find the truth. If the truth says your idea needs changing, that is not failure — that is learning. And learning before you spend money is the smartest thing any entrepreneur can do.