The readings / 03
Fifteen pieces.
One argument.
A 15-piece reading plan, followed by an expanded manuscript. Each piece is published on Substack first; the shelf below updates as they land.
01—3
The changed constraint
01Lean Startup Was a Rationing System. The Ration Ended.
Re-derive inherited practices around the scarcity that actually constrains you.
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Viable ProductReading 01
The ration ended. The discipline shouldn't.
Daniel Willoughby · Master excerptThe MVP Is Dead. Build the Whole Thing — Then Ration Who Sees It.
Build at full ambition and control customer exposure with explicit gates.
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Viable ProductReading 02
Build the whole thing. Then ration who sees it.
Daniel Willoughby · Master excerptValidated Learning Is Now Verified Capability
Prove capability before interpreting market feedback.
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Viable ProductReading 03
A deploy log is
not a witness.
Daniel Willoughby · Master excerpt04—9
The replacement practices
04Build-Measure-Learn Didn't Die. It Moved Inside the Build.
Turn the lessons of building into checks the next worker encounters.
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Viable ProductReading 04
Build, measure, learn was a loop that produced knowledge.
Plan, build, verify, compound is a loop that produces the company.
Daniel Willoughby · Master excerpt"Shipped" Is the New Vanity Metric
Audit progress words and put process rules on dated trials.
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Viable ProductReading 05
The check earns its authority by a dated, falsifiable gate, or it
gets demoted to advice.
Daniel Willoughby · Master excerptPivot-or-Persevere Is Too Slow. Write the STOP Conditions First.
Write falsifiable stop triggers before a builder encounters a broken premise.
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Viable ProductReading 06
A pivot meeting is a tripwire you decided not to install.
Daniel Willoughby · Master excerptWe A/B Test Before the Customer Exists
Compare distinct complete alternatives internally, then test demand outside.
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Viable ProductReading 07
Internal judging settles craft. Real customers still decide demand.
The customer should be your last judge, not your first.
Daniel Willoughby · Master excerptWe Turned Off CI, and Ries Would Understand
Move stop authority into the work; removing paid CI is a contingent example.
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Viable ProductReading 08
Put the stop where the work happens
Daniel Willoughby · Master excerptThe Wizard of Oz Retired. The Machine Is Real and the Audience Is Fake.
Run real machinery for a controlled audience, with written criteria for wider exposure.
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Viable ProductReading 09
Fake the audience, never the machine.
Daniel Willoughby · Master excerptFive Whys Survived. We Just Took Away the Option to Skip It.
Make root-cause investigation precede the next plausible patch.
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Viable ProductReading 10
Building got faster. So did thrashing. They were the same upgrade.
Daniel Willoughby · Master excerptGenchi Genbutsu, Except the Factory Floor Is Your AI's Homework
Check the primary artifact when a summary is about to drive a decision.
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Viable ProductReading 11
A summary can misstate the artifact it describes. Go one room further and read the source.
The artifact is always one room past it.
Daniel Willoughby · Master excerptSmall Batches: The One Toyota Bet AI Doubled
Limit unverified work in time and across parallel workstreams.
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Viable ProductReading 12
A big batch dies whole. Small batches die one unit at a time.
Daniel Willoughby · Master excerpt13—15
Value, responsibility, humility
13The Frameworks That Appreciated
Demand frameworks gain value when build effort stops filtering choices.
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Viable ProductReading 13
The milkshake study didn't get better in the last two years. Everything around
it got cheaper.
Daniel Willoughby · Master excerptThe New Failure Modes
Adopt each new capability with its verification step attached.
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Viable ProductReading 14
Every new power ships with its new check, or you don't get the power.
Daniel Willoughby · Master excerptWhat AI Didn't Kill
Only real customers can settle demand; preserve Lean’s humility.
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Viable ProductReading 15
You can't spin up a customer.
Daniel Willoughby · Master excerptThe practices expired. The refusal is the inheritance.From piece 15
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