📖 Book
✓ Link checked
Paid
Beginner
Why we picked it
The single best thing ever written on customer conversations. It teaches you to ask about the customer's life and past behaviour, not your idea, so you can't be lied to. If a founder reads one thing before talking to a single customer, it's this.
From
momtestbook.com
by Rob Fitzpatrick
~130 pages
- Talk about their life, not your idea.
- Ask about specifics in the past, not opinions about the future.
- 'That's so cool, I'd totally buy it' is a compliment, not data, dig for commitment and evidence.
Open
momtestbook.com →
✍️ Essay
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Free
Beginner
Why we picked it
The definitive essay on where good ideas come from: notice problems you personally have, don't force it. Use it as the lens for judging whether your idea is a real problem or a solution in search of one.
From
paulgraham.com
by Paul Graham
~20 min read
- Live in the future and build what's missing.
- The best ideas look like bad ideas at first (schleps and hard-to-explain).
- Start with problems you have, in a domain you actually know.
Open
paulgraham.com →
📄 Article
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Free
Beginner
Why we picked it
A step-by-step guide to running discovery when you have almost no data, aimed squarely at first-time founders. It is practical on finding people to talk to and asking in a way that surfaces truth rather than encouragement. A solid starting point before your first batch of interviews.
From
First Round Review
by Jeanette Mellinger
15 min read
- Start discovery before you have a product.
- Recruit the right people to talk to.
- Ask so customers can safely tell you no.
Open
review.firstround.com →
✍️ Essay
✓ Link checked
Free
Beginner
Why we picked it
This is the sharpest short framework for the exact question: is the problem a nice-to-have (vitamin) or something people are actively hurting from (painkiller). Rhea's most useful test is a gut check on your own interviews, if you find yourself convincing a prospect they have a problem, or getting excited every time you catch a glimpse of it, that is a warning sign you have a vitamin. It reframes the judgment from what you hope is true to what customers already feel without you nudging them.
From
brianrhea.com
by Brian Rhea
About a 7 minute read
- Painkillers get bought without reminders because the pain is already felt; vitamins get put off because the need is theoretical and non-urgent.
- If you are talking a prospect into believing they have the problem during an interview, you are probably looking at a vitamin, real pain shows up on its own.
- Find the pain first through honest customer conversations, then design the fix, not the other way around.
Open
brianrhea.com →
📄 Article
✓ Link checked
Freemium
Beginner
Why we picked it
Todd Jackson studied how dozens of now-large companies validated their very first idea. The pattern that repeats: deliver the outcome by hand, talk to real users, and watch for genuine emotion. A polite 'that's cool' is a no. Strong reactions are the signal you want.
From
Lenny's Newsletter
by Todd Jackson
~15 min read
- Manual delivery beats a survey for early signal.
- Look for strong emotion, not politeness.
- Great ideas usually start from a problem you have lived.
Open
lennysnewsletter.com →
📄 Article
✓ Link checked
Free
Intermediate
Why we picked it
Turns the vague feeling of product-market fit into a number you can move. Ask users how they would feel if they could no longer use the product, then track the share who say 'very disappointed'. Under 40 percent means keep working. A test you can run on an idea long before you scale it.
From
First Round Review
by Rahul Vohra
~20 min read
- The 40 percent 'very disappointed' benchmark for product-market fit.
- Segment to your high-expectation customers and build for them.
- Make the fit score a metric you improve quarter by quarter.
Open
review.firstround.com →
✍️ Essay
✓ Link checked
Free
Intermediate
Why we picked it
The essay that put 'product-market fit' into the startup vocabulary. Read it for the gut-level description of what PMF feels like when it's happening vs when it isn't, the intuition behind the metrics.
From
pmarchive.com
by Marc Andreessen
~15 min read
- Market matters most; a great market pulls product out of a startup.
- You can feel PMF, customers buy as fast as you can ship.
- Before PMF, do whatever it takes to get there; nothing else counts.
Open
pmarchive.com →
📖 Book
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Paid
Intermediate
Why we picked it
Savoia, a former Google innovation lead, argues most ideas fail because they were never 'the right it', and he gives you cheap pretotypes (fake doors, mechanical turks, one-night stands) to get real demand data in days. Instead of asking people if they would use it, you watch whether they actually act. This is how you catch a nice-to-have before you spend a year on it.
From
Alberto Savoia
by Alberto Savoia
256 pages
- Collect your own data on whether people will actually act, not just say yes
- Pretotypes test demand in days for pennies before you build anything
- Most ideas fail because the market did not want it, so test that first
Open
albertosavoia.com →
📖 Book
✓ Link checked
Paid
Advanced
Why we picked it
The book that coined get out of the building and launched the customer development movement. Blank's core claim is that a startup searches for a business model rather than executes one, so your early job is to test hypotheses against real customers before you scale anything. It is heavier than The Mom Test, but it gives you the full framework for validating a market before you build for it.
From
Wiley
by Steve Blank
- Startups search for a business model, they do not just execute a plan
- Test your riskiest assumptions with real customers before committing to build
- Customer discovery and validation come before you spend on customer creation
Open
wiley.com →
