Verified85% confidenceFactTime unknown
Sean Ellis's "40% test" holds that if more than 40% of users say they would be "very disappointed" if the product disappeared, then PMF has been achieved.
5
Sources
85%
Confidence
Long-term
Relevance
5/31/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedThe 40% rule proposed by Sean Ellis is used to quantify PMF: if more than 40% of users say they would be very disappointed if they could no longer use the product, the product has preliminarily achieved PMF.77% similarUnverifiedNielsen Norman Group的可用性研究显示每个非必要的交互步骤都会导致约20%的用户流失67% similarUnverified判断PMF的经验性指标包括Sean Ellis提出的40%测试、净推荐值NPS以及自然增长比例67% similarUnverifiedIn the TRACES test, every model had a failure rate above 71% on the 'agentic' probes; 22 of the 30 models had failure rates above 90%.66% similar
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