Build-measure-learn loop
OfficialOfficial · updated Nov 4, 2026 · v1.0.1
Turns a new idea into a one-page experiment card: the riskiest assumption, the smallest test, a metric and threshold set in advance, a decision date, and a pivot-or-persevere rule.
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When to use it
- Before weeks of building something new on untested assumptions
- Someone asks what the MVP is or how to validate an idea
- Numbers are flat and the team argues about pivoting
What you give it
- The idea: customer, problem, offer
- Evidence so far
- Time, money and decider for one test
- Current baseline, if the product exists
What you get
An experiment card with leap-of-faith assumptions, what to learn, metric and threshold, the MVP, a persevere/pivot/in-between rule, and the next loop.
Changelog
- v1.0.1 · Nov 4, 2026 · Example: the card tests only the $240 price assumption (switching is marked Later; a paid first month gives a first sign), and the pivot rule says 'clearly below the threshold', the words its check refers to.
- v1.0.0 · Nov 4, 2026 · First release.
Sources
- The Lean Startup: Principles - Eric Ries (2026-11-04)
- The Lean Startup: the book - Eric Ries (2026-11-04)
- Minimum Viable Product: a guide - Eric Ries, Startup Lessons Learned (2026-11-04)
- Pivot or Persevere? The Key to Startup Success - Eric Ries, Entrepreneur (2026-11-04)
Related skills
- A/B test plan Writes an A/B test brief: hypothesis, primary and guardrail metrics, MDE, sample size and duration with the math, stop rules, and a decision rule set in advance.
- Beachhead segment plan Scores candidate segments and picks one beachhead with its compelling reason to buy, lists the whole-product gaps, drafts a positioning line, and names the next adjacent segments.
- User interview guide Writes a user interview guide with a screener, warm-up, past-behavior questions with no hypotheticals or leading, probes, and a wrap-up.
- Jobs-to-be-done switch interview Plans and synthesizes JTBD switch interviews: a timeline guide, a timeline and four-forces summary per interview, and a job statement across interviews with decisions.
- Unit economics check Checks CAC, LTV, LTV to CAC, payback, and gross margin from your numbers, shows each formula, and flags definitional mistakes that inflate results.