Principle
High confidence
Personalized Experiences Generate 41% Higher Impact Than Generic
Analysis of 127,000 experiments found personalized experiences generate 41% higher impact compared to non-personalized, generic experiences.
Hypothesis
Tailoring content or offers to specific audience segments outperforms generic one-size-fits-all experiences.
Why This Works
Key Learnings
Expected Lift Range
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Test Idea
Winner
Personalized Next Step
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Expected lift: 5%-10%
High confidence
Research Finding
Principle
Commonly Used Metrics Are Poor Predictors of Business Impact
measurementany
High confidence
Best Practice
Loser
Ghost / Outline Buttons Lose to Filled Buttons — Consistently
ctaany
Expected lift: -25%-0%
High confidence
Test Idea
Winner
Cart Reminder And Recently Viewed
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Expected lift: 5%-10%
High confidence
Research Finding
Principle
Test Quality Peaks at 1–10 Annual Tests Per Engineer; Drops 87% After 30
testing_strategyany
High confidence