product-market-fit

Master frameworks for measuring, achieving, and maintaining product-market fit (PMF). Use when validating new products, assessing readiness to scale, diagnosing retention problems, planning market expansion, measuring "very disappointed" score, implementing PMF engines, or determining if you have permission to grow. Covers Sean Ellis survey methodology, Superhuman PMF engine, retention curve analysis, leading/lagging indicators, pre-PMF vs. post-PMF strategies, and maintaining fit as markets evolve.