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ChatGPTMidjourneyClaude
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Achieve and measure PMF. Indicators: 1. Sean Ellis test ('how disappointed if product went away?' >40% 'very'). 2. Organic growth and word-of-mouth. 3. High retention rates. 4. Users getting core value quickly. 5. Revenue growth acceleration. 6. Qualitative: strong customer enthusiasm. Before PMF: talk to users constantly, iterate quickly. After PMF: scale efficiently. Don't scale prematurely. PMF is not permanent - can lose it.