Customer Discovery
Most failed startups did not fail because the product was bad. They failed because nobody wanted what they built. Customer discovery is the discipline of finding out what customers actually want — before you invest months building it. This course teaches interviewing, validation, and the habit of testing assumptions early and cheaply.
What you'll learn
Course outline
Free — no account needed
Why Customer Discovery Is the Highest-ROI Activity in a Startup
The only way to avoid building something nobody wants — and why most founders skip it
Finding the Right People to Talk To
Where to find customers, how to recruit them, and who to interview first
The Mom Test — How to Ask Questions That Cannot Lie
The interview framework that eliminates false positives and gets you to the truth
Full course — $39 one-time
Running the Interview — The 5-Part Script
A proven interview structure that takes 20 minutes and extracts the maximum signal
Spotting Patterns — From Raw Interviews to Validated Insights
How to synthesise 10 interviews into actionable conclusions without fooling yourself
Smoke Tests — Validating Demand Before You Build
How to test willingness to pay with a landing page, before writing a single line of product code
Continuous Discovery — The Habit That Prevents Product Drift
How to keep customer insight current as your product and market evolve
Get the full course
7 lessons — from interview scripts to smoke tests and the continuous discovery habit.
About this course
Customer discovery is the practice of systematically learning whether a problem is real, whether your solution is right, and whether enough people will pay for it — before investing months building the wrong thing. Learning customer discovery means understanding how to recruit and interview target customers, ask questions that reveal genuine behaviour rather than optimistic speculation, and translate interview insights into product decisions. This customer discovery tutorial covers the lean startup methods used by the most successful product teams.
Customer discovery skills are essential for founders building new products, product managers evaluating new features, and anyone who has been burned by building something nobody wanted. After this course you will be able to recruit relevant interview candidates, run interviews that extract genuine insight rather than validation, identify patterns across interviews, and use the results to make confident build/no-build decisions.
Frequently asked questions
What is the difference between customer discovery and user research?
Customer discovery is focused on the earliest, most uncertain phase of building — before you have a product — and asks: does this problem exist, who has it, and will they pay to solve it? User research is conducted on an existing product and asks: how are people using this, where do they struggle, and how can we improve it? Customer discovery is exploratory and strategic; user research is evaluative and tactical.
What questions should I ask in a customer discovery interview?
The best customer discovery questions ask about past behaviour rather than future hypotheticals. "Tell me about the last time you experienced this problem" reveals far more than "Would you use a product that did X?" Other powerful questions: "How do you currently solve this?", "What does it cost you when this problem occurs?", "Who else is involved in this decision?", and "What would have to be true for you to switch to a new solution?" Avoid leading questions.
How many interviews do I need to conduct?
Qualitative saturation — the point where new interviews stop surfacing new themes — typically occurs between 8 and 15 interviews per distinct customer segment. Conducting 5 interviews and reaching premature conclusions is a common mistake. If you are talking to multiple distinct segments, run 8–10 per segment. More interviews add confidence; fewer than five per segment are rarely sufficient to identify meaningful patterns.
How do I recruit people to interview?
Recruiting strategies depend on your target customer. For consumers: LinkedIn, Reddit communities, Twitter/X posts asking for people with the specific problem. For B2B: LinkedIn Sales Navigator to find job titles, founder networks, warm introductions, and your own network. Offer an incentive ($25–$50 gift card for 30 minutes) for strangers. The most valuable interviews are with people who experience the problem frequently and intensely.
When should I stop customer discovery and start building?
Stop when you can predict what customers will say before they say it — patterns become repetitive. Practically: when you have talked to 10–20 representative customers, have identified a clear, common, unmet problem, found that existing solutions are inadequate, confirmed that people pay (in money or time) to address the problem today, and have 5+ people who say they would pay for your specific solution. Early customer commitments (letters of intent) are the highest-confidence signal.