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Lenny's Knowledge Sketch

The One Question That
Saves Product Careers

Matt LeMay
Author "Product Management in Practice"; career coach
AUG 14 2025
The Question

Ask This Before Every
Product Decision

PROBLEMDECISIONOUTCOME
"The question is: 'What would need to be true for this to be the right decision?' That question saves careers. Most PMs never ask it."
  • The right question reveals your assumptions — which is where most decisions fail
  • PM failure: making decisions based on confident assumptions that were never validated
  • The question forces hypothesis-testing rather than advocacy
  • It works in any direction: what needs to be true for you to be right AND for you to be wrong
Framework

The One Question Framework

ASSUMPTIONTESTDECISION
80%
of PM decisions fail at assumption level
better outcomes with assumption-testing
1
question that unlocks all the others
  • "What would need to be true for this to work?" — reveals the hidden bet
  • Once you name the bet, you can test it — a prototype, an interview, an analysis
  • If the bet is untestable, it's not a decision — it's a guess
  • The career-saving move: say "I'm making a bet that X is true. Let's verify before we build."
Matt's observationThe best PMs say "here's what I'm assuming" before they say "here's what we should build." The worst PMs say the second without the first.
Product Career Survival

Why PM Careers Derail

  • Advocacy over inquiry: Defending decisions instead of testing assumptions
  • Losing the forest: Optimizing features while the strategy is wrong
  • Stakeholder management theater: Managing optics instead of managing outcomes
  • Impact measurement avoidance: Shipping without defining success first
The advocacy trap

PMs who advocate for their ideas and test their competitors' ideas are operating backwards. Test your own ideas hardest.

The impact definition test

Before every project: "How will we know in 90 days if this was the right thing to build?" If you can't answer it, don't start.

Playbook

Ask the Right Questions

  • For every major product decision: "What would need to be true for this to be right?"
  • Define your success metric before you start building — never after
  • Document your assumptions explicitly and assign each a confidence level
  • Revisit your assumptions monthly: which ones changed? What does that mean for the decision?
The book insightMatt's "Product Management in Practice" is required reading for every PM. The advice is annoyingly simple and consistently ignored.
Contrarian

PM Wisdom Myths

Data-driven decisions are always rightINSTEAD →Data without good questions produces confident wrong decisions faster than gut instinct.
Great PMs advocate for usersINSTEAD →Great PMs advocate for outcomes. Users ask for features; they need solutions to problems.
Stakeholder management is about managing upINSTEAD →Stakeholder management is about aligning incentives. "Managing up" is a symptom of misaligned incentives.
Shipping is the measure of PM successINSTEAD →Learning is the measure of PM success. Shipping without learning is expensive activity with no value.
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