--- title: "Heuristic Evaluation" url: "https://insideuxdesign.com/en/glossar/heuristic-evaluation" language: "en" description: "What is a heuristic evaluation? A plain-language guide with the process, an example and tips. Learn how to find usability problems quickly and cheaply." published: "2026-10-14T09:50:31+02:00" updated: "2026-10-14T13:03:54+02:00" --- # Heuristic Evaluation In a heuristic evaluation, experts review an interface against established rules of thumb for good usability. It helps you find typical weak spots quickly and cheaply, even before real people test the product. - **Buchstabe:** H UX glossary # Heuristic Evaluation In a heuristic evaluation, experts review an interface against established rules of thumb for good usability. It helps you find typical weak spots quickly and cheaply, even before real people test the product. Imagine a city council that wants to launch a new online form for residential parking permits in two weeks. There’s no time or budget for a thorough test with residents. Still, the form shouldn’t contain any obvious stumbling blocks. This is where a heuristic evaluation comes in. ## Explained simply A heuristic is a rule of thumb, a tried-and-tested guideline that holds true most of the time. In a heuristic evaluation, experts walk through an interface step by step and check where it breaks those rules. Real users aren’t involved. Think of a car inspection: before a car goes in for its official roadworthiness test, a garage checks it against a fixed checklist. Brakes, lights, tires. That catches the typical defects, even though nobody recreates every driving situation. The method goes back to Jakob Nielsen and Rolf Molich, who introduced it in 1990. ## Nielsen’s ten heuristics The most widely used set is the ten usability heuristics that Nielsen refined in 1994. They include “Visibility of system status” (show what’s going on), “Match between the system and the real world” (speak your users’ language), “Error prevention” and “Recognition rather than recall” (make options visible instead of relying on memory). You’ll find an overview in the resource [10 Usability Heuristics](https://insideuxdesign.com/en/ressourcen/10-usability-heuristics). The process matters: several experts first review the interface independently and only then combine their findings. Across six of his projects, Nielsen found that single evaluators caught only about 35 percent of the problems on average. That’s why he recommends three to five evaluators, since each one spots different issues. ## An example Back to the parking permit. Before: after submitting, the form shows nothing but a blank screen, error messages appear bundled at the top of the page, and the field labeled “Registered keeper details” uses bureaucratic jargon. Three evaluators independently find different issues and then agree on the most important ones. After: a confirmation clearly shows that the application was received, errors appear right next to the affected field, and the label now reads, in plain words, “Who is the car registered to?” ## Common misconceptions A heuristic evaluation is no substitute for [usability testing](https://insideuxdesign.com/en/glossar/usability-testing). It shows where an interface breaks proven rules, but not how real people cope with it in their own context. And not every violation is automatically a problem: sometimes it’s a deliberate trade-off. To learn how to use expert judgment well, read [How to Use Expert Evaluation Correctly](https://insideuxdesign.com/en/blog/how-to-use-expert-evaluation-correctly). ## In practice - **Review alone first, then together.** If you see the others’ findings early, you’ll miss your own. Only compare notes once everyone is done. - **Limit the scope.** Focus on key flows such as sign-up or checkout instead of reviewing the entire product at once. - **Rate the severity.** For each finding, note how badly it gets in people’s way. That tells the team what to fix first. ## Related terms [Usability Testing](https://insideuxdesign.com/en/glossar/usability-testing), [System Usability Scale](https://insideuxdesign.com/en/glossar/system-usability-scale), [Mental Model](https://insideuxdesign.com/en/glossar/mental-model), [Cognitive Load](https://insideuxdesign.com/en/glossar/cognitive-load) ## Sources - [Jakob Nielsen: 10 Usability Heuristics for User Interface Design. Nielsen Norman Group, 1994, updated 2020](https://www.nngroup.com/articles/ten-usability-heuristics/) - [Kate Moran, Kelley Gordon: How to Conduct a Heuristic Evaluation. Nielsen Norman Group, 2023](https://www.nngroup.com/articles/how-to-conduct-a-heuristic-evaluation/) - [Jakob Nielsen: The Theory Behind Heuristic Evaluations. Nielsen Norman Group, 1994](https://www.nngroup.com/articles/how-to-conduct-a-heuristic-evaluation/theory-heuristic-evaluations/) ## More terms [ ### A/B Testing An A/B test is an experiment that shows two versions of a page or element at the same time to randomly split groups of visitors. It lets you decide with real data which version works better. ](https://insideuxdesign.com/en/glossar/a-b-testing) [ ### ARIA ARIA is a W3C standard that adds roles, states and properties to HTML. It tells screen readers what an element is and how it currently behaves. ](https://insideuxdesign.com/en/glossar/aria) [ ### Accessibility Accessibility means designing websites, apps and digital documents so that everyone can use them, including people with visual, hearing, motor or cognitive disabilities. ](https://insideuxdesign.com/en/glossar/accessibility) [ ### Affordance An affordance describes what action an object makes possible and whether people can recognize it: a button invites you to press it, a handle invites you to pull. ](https://insideuxdesign.com/en/glossar/affordance) [ ### Alt Text Alt text is a short text version of an image, stored in the HTML alt attribute. Screen readers read it aloud so people who can’t see the image get the same information. ](https://insideuxdesign.com/en/glossar/alt-text) [ ### Atomic Design Atomic Design is a method for building user interfaces from small, reusable building blocks, from single elements like buttons all the way up to complete pages. ](https://insideuxdesign.com/en/glossar/atomic-design) [ ### BFSG The BFSG, Germany’s Accessibility Strengthening Act, has required many companies since 28 June 2025 to make certain products and digital services, such as online shops, accessible. ](https://insideuxdesign.com/en/glossar/bfsg) [ ### Card Sorting Card sorting is a research method in which people sort terms written on cards into groups. It shows you how they mentally organize content, so you can plan navigation that makes sense to them. ](https://insideuxdesign.com/en/glossar/card-sorting) [ ### Cognitive Load Cognitive load is the mental effort it takes to understand and use an interface. The less unnecessary thinking a design demands, the easier the actual task becomes. ](https://insideuxdesign.com/en/glossar/cognitive-load) [ ### Color Vision Deficiency A color vision deficiency means someone has a harder time telling certain colors apart than most people. The most common type is red-green deficiency. ](https://insideuxdesign.com/en/glossar/color-vision-deficiency) [ ### Contextual Inquiry Contextual inquiry is a research method where you observe and interview people in their real work environment. It shows you how they actually get tasks done, not just how they describe it. ](https://insideuxdesign.com/en/glossar/contextual-inquiry) [ ### Contrast Ratio The contrast ratio describes how much two colors differ in brightness, such as text and background. WCAG requires at least 4.5:1 for normal text. ](https://insideuxdesign.com/en/glossar/contrast-ratio)