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Why we picked it Winters, who led growth at Pinterest and Grubhub, reframes PMF as the point where users stop leaving, and shows how to read it off cohort retention curves rather than satisfaction scores. It is the most rigorous treatment of measuring fit as a trend over time, exactly the framing in your short answer. Best once you have some usage data to analyze.
Casey's Guide to Finding Product/Market Fit
From Casey Accidental (Casey Winters) by Casey Winters ~3,500 words
- PMF is when they stop leaving, measured by retention flattening
- Satisfaction surveys mislead, revealed retention behavior does not
- Use cohort analysis to watch fit as a trend, not a snapshot
