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© Eidra
2025-05-26 29
Hierarchy of Evidence
Meta RCT’s
Meta-analysis of your experiments
Randomized Controlled Trials
Your own A/B tests or MVT experiments
Quantitative & Qualitative data
Web analytics analysis, on-site surveys, usability testing, heat- &
scroll maps, 1-1 interviews, data mining at sales and/or customer
service.
Market Research
Heuristic evaluations, external reports/sources, meta-research
Expert opinion & case studies
Asking just one person (not a customer), HiPPO or ZEBRA if
(s)he likes the website.
Not evidence
Anecdotes, gut feeling, forums, competitors,
Linkedin Lunatics, A/B test results websites, Awards,
etc.
Risk of Bias Quality of Evidence
Lower Strong
Weak
Higher