Title: The Lean Startup: How Today’s Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses

Author: Eric Ries

Publication date (EN): September 13, 2011 (Crown Business/Crown Currency). 

Pages (EN): 336 (US hardcover). 

Value for PMs & founders (problem it solves)
A scientific, evidence-based approach to product risk: run Build–Measure–Learn loops with MVPs, practice validated learning and innovation accounting, and pivot or persevere based on causal metrics—not vanity metrics.

Summary
Treat a startup as a grand experiment: state leap-of-faith hypotheses, ship an MVP to learn quickly, measure with actionable metrics, and iterate or pivot. The method shortens dev cycles and channels effort into what demonstrably creates value. 

3 community-reported takeaways (with sources)

  1. Build–Measure–Learn is the operating system—many practitioners highlight the loop as the #1 habit. Reddit

  2. MVPs exist to learn—optimize for validated learning, not breadth of features. Lean Startup Co.

  3. Innovation accounting > vanity metrics—set learning goals and track progress with causal metrics. ClickUp

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