An expert‑based inspection method in usability and interaction design in which evaluators systematically apply a set of recognized usability heuristics to an interface or prototype to identify, classify and prioritize likely usability problems without direct end‑user testing.

Principle

A small team of skilled evaluators applying established heuristics can rapidly surface recurring usability violations and predict where users are likely to encounter friction, producing actionable findings earlier and at lower cost than large empirical studies.

Demonstration

Illustrative scenario — Situation: Early prototype of a mobile app must be assessed before user recruitment. Recognition: A UX lead selects five evaluators with diverse domain experience. Action: Each evaluator reviews core tasks against a standard heuristic checklist, records violations with severity ratings and screenshots, and the team aggregates and prioritizes fixes. Consequence: The team implements high‑severity fixes before user testing, reducing common obstacles and making subsequent user tests more focused.

Misapplication

Treating heuristic evaluation as a substitute for empirical user testing or assuming its findings represent real user behavior. Error: conflates expert inference with observed user data and overlooks contextual, cultural, or task‑specific issues that only empirical testing can reveal.

Consequence

When used appropriately, heuristic evaluation yields fast, low‑cost identification and prioritization of usability issues useful in early design cycles; overreliance can miss contextual problems, accessibility issues, and unexpected user strategies that emerge only in observation.

Reversal

For novel interaction paradigms, culturally specific interfaces, or deeply context‑dependent workflows, heuristics derived from established conventions may be inapplicable or misleading; in such cases, complementary methods (remote or in‑lab user testing, contextual inquiry) are required.

Boundary

Clearly within: expert reviews of GUIs, websites and interactive prototypes using established heuristics. Boundary case: cognitive walkthroughs or guideline checklists that focus more narrowly on task cognition. Clearly outside: large‑scale quantitative usability testing, A/B experiments and long‑term field studies.

Semantic Tension

Tension between speed/cost‑efficiency (expert inspection) and ecological validity/representativeness (empirical user research).

Synthesis

Heuristic evaluation is a diagnostic, cost‑effective instrument for early detection and prioritization of usability problems that must be integrated with empirical user research to ensure solutions address real user needs and contexts.