Customer discovery
In one sentence
Go and talk to real potential customers to check that the problem you want to solve actually exists.
The simple version
Your idea lives in your head. The truth lives with your customers. Customer discovery means leaving your desk, meeting the people you want to serve, and learning about their lives and problems — before you build anything.
- 1Customer discovery
- 2Customer validation
- 3Customer creation
- 4Company building
Why it matters
The most common reason startups fail is building something nobody needs. Talking to customers early is the cheapest way to avoid that.
How to do it
- 1Pick a specific group of people (e.g. 'freelance designers in London', not 'everyone').
- 2List what you believe about their problem.
- 3Have 10–20 conversations about their current situation.
- 4Look for patterns: do they feel this pain often, and have they tried to fix it?
- 5Update your beliefs — or pick a new problem.
Real-world example
A founder wants to build a meal-planning app for parents. After 15 interviews she learns parents don't struggle to plan meals — they struggle to shop for them. She changes the idea before writing any code.
What the books say
“There are no facts inside your building, so get outside.”
“Life's too short to build something nobody wants.”
Common mistakes
- Only talking to friends and family.
- Pitching your idea instead of listening.
- Stopping after two or three conversations.
Questions people ask
How many people should I talk to?
Start with 10–20. You'll usually see patterns emerge after a handful; keep going until you stop being surprised.
What if I can't find anyone to talk to?
That's a signal in itself. If your customers are impossible to reach now, they'll be hard to sell to later.
References
- [1]
- [2]
- [3]
More books on this in the library
Build: An Unorthodox Guide to Making Things Worth Making
A practical startup and product-building book by Tony Fadell that shares hard-won lessons from building world-changing products at Apple, Nest, and other ventures. It covers how to go from idea to product, lead teams, navigate investors, and make products that truly matter—highly relevant for startup founders learning to build and ship things people love.
Lean UX
Lean UX adapts user experience design to the Lean Startup world, helping product teams and founders build, measure, and learn faster by emphasizing collaboration, experimentation, and continuous learning.
UX for Lean Startups
UX for Lean Startups shows founders and early-stage teams how to do effective user experience research and design with limited time and resources, aligning UX work with Lean Startup experimentation.
Talking to Humans: Success Starts with Understanding Your Customers
Giff Constable's ultra-practical guide to customer discovery. Short, free, and filled with tactical advice for validating ideas through conversations.
The Mom Test
A practical guide to customer conversations that teaches founders how to ask the right questions and avoid misleading feedback. The book provides a simple framework to uncover honest customer insights during interviews.
The Mom Test: How to talk to customers & learn if your business is a good idea when everyone is lying to you
Guide to conducting effective customer interviews without biasing responses or getting false compliments. Shelved 137 times as startup on Goodreads with average rating 4.37 from 14,040 ratings, published 2013.
Learn next
The Mom Test
Ask customers about their real life and past behaviour — never 'do you like my idea?'.
Jobs to Be Done
People don't buy products — they 'hire' them to get a job done in their life.
Minimum Viable Product (MVP)
The smallest version of your product that lets you learn whether you're on the right track.