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ChatGPTMidjourneyClaude
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Measure and validate product-market fit. Indicators: 1. Sean Ellis test (% users 'very disappointed' if product disappeared >40%). 2. Retention cohorts (flattening curve after initial drop). 3. Organic growth rate (word-of-mouth, low CAC). 4. NPS score (>50 is excellent). 5. Sales cycle length (decreasing over time). 6. Customer feedback themes (solving real pain). Conduct surveys and analyze usage data. If PMF not achieved, pivot or iterate. Document assumptions and validate continuously.