Heuristic Evaluation

What is a heuristic evaluation?

In a heuristic evaluation, specialists review a website or app against a fixed set of rules of thumb, known as heuristics. The method was introduced by Jakob Nielsen and Rolf Molich in 1990. The best-known set is Nielsen's ten usability heuristics, such as visibility of system status, consistency and error prevention.

Several reviewers first go through the interface independently and note every violation they find. The findings are then merged and rated by severity. Real users are not involved.

Why a heuristic evaluation matters

It is fast and affordable. Within a few days you get a prioritized list of likely problems, even for areas that are hard to test. It does not replace usability testing, though. Experts can spot broken principles, but they cannot see how your audience actually behaves. The method works best as a first diagnosis whose results you then verify with real users.

How to run a heuristic evaluation in practice

• Set the scope: Pick the key flows, such as sign-up or checkout, instead of reviewing the whole product at once.
• Use several reviewers: Two or three people find far more than one. Let them work separately first.
• Rate severity: Score each finding by frequency, impact and persistence so it is clear what comes first.
• Document specifics: Record the screen, the heuristic and the problem, not just a general verdict.
• Validate: Check the most critical issues in a usability test before you plan a major redesign.

Common mistakes

Teams often confuse the evaluation with personal taste. "I don't like the color" is not a finding. Another mistake is relying on a single reviewer, or treating the results as proof when they remain hypotheses until users confirm them.