Heuristic Evaluation

Heuristic evaluation is a usability inspection method: a small set of evaluators independently audits an interface against established usability principles — canonically Jakob Nielsen's ten heuristics — then consolidates findings into a severity-ranked problem list. Invented by Nielsen and Rolf Molich in 1990 as 'discount usability engineering', it trades the depth of user testing for speed and cost: likely problems found in days, no participants recruited, no lab booked — and its honest limit is built into the trade: experts predict where users will struggle; only users confirm it.

The canon being audited against — Nielsen's ten, the versions every CRO checklist descends from: visibility of system status (does the interface say what's happening?), match with the real world (the user's words, not the org chart's), user control and freedom (undo, escape, back), consistency and standards, error prevention, recognition over recall, flexibility and efficiency, aesthetic and minimalist design, helpful error recovery (the heuristic conversion funnels violate most expensively — errors that blame without explaining), and help and documentation. The method's mechanics that separate it from 'an expert looked at it': multiple evaluators working INDEPENDENTLY before consolidating (Nielsen's research: single evaluators find roughly a third of problems; three to five independent passes find most — and independence prevents the first loud opinion from anchoring the rest), every finding tied to a named heuristic (the discipline that converts taste into evidence), and severity scored on frequency, impact, and persistence — because the output's value is the ranking, not the list. The CRO handoff this entry's slug implies: heuristic findings are HYPOTHESES — the severity-4 checkout violation becomes a test candidate, not a ship order; pair the evaluation with funnel analytics (do severity scores match where the FUNNEL-ANALYSIS says money leaks?) and let experiments settle what expert judgment proposed. The cousins for context: cognitive walkthroughs (task-by-task first-use simulation) and expert reviews (unstructured) bracket the method's formality.

Heuristic evaluation matters as CRO's opening move — new funnels, inherited sites, pre-redesign audits — where it finds the obvious leaks in days and rank-orders the testing roadmap before a single experiment spends traffic. It matters most when the discipline holds (independent evaluators, named heuristics, severity scores, analytics cross-check) and degrades into opinion-with-letterhead when it doesn't. The handoff rule keeps it honest: the evaluation proposes, analytics corroborates, the test decides — three instruments, in that order, each pricing the next one's agenda.

Nielsen and Molich published heuristic evaluation in 1990 as 'discount usability engineering' - expert inspection against principles instead of lab studies - and Nielsen's refined ten heuristics (1994) became the canon; CRO adopted the method wholesale as the cheap, fast first pass that aims the expensive instruments.

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