What is heuristic evaluation in UX design?
Heuristic evaluation is a usability inspection method in which one or more UX experts examine an interface and evaluate it against a set of recognized usability principles, called heuristics. Unlike usability testing, it does not involve real users. Instead, it relies on expert judgment informed by established knowledge of how users typically behave and what kinds of design patterns cause problems.
The most widely used heuristics are Jakob Nielsen's 10 usability heuristics, published in 1990 and still the standard reference for the method.
What are Nielsen's 10 usability heuristics?
Visibility of system status means the interface should always keep users informed about what is happening. Match between system and the real world means the interface should use language and concepts familiar to users. User control and freedom means users should be able to undo and redo actions easily. Consistency and standards means similar things should look and behave similarly. Error prevention means the interface should prevent problems before they occur. Recognition over recall means users should not have to remember information between steps. Flexibility and efficiency of use means the interface should serve both novice and expert users. Aesthetic and minimalist design means interfaces should not contain irrelevant information. Help users recognize, diagnose, and recover from errors means error messages should be clear and constructive. Help and documentation means the interface should provide accessible support when users need it.
When should you use heuristic evaluation in UX?
Heuristic evaluation is most valuable early in the design process when testing with real users isn't yet feasible, as a complement to usability testing to explain why observed problems occur, when auditing an existing product to identify systemic issues, and when time or budget constraints make user research impractical. It is particularly effective at surfacing issues related to consistency, error handling, missing feedback, and cognitive load.
What is the difference between heuristic evaluation and usability testing?
Heuristic evaluation is conducted by experts evaluating an interface against known principles. Usability testing is conducted with real users completing real tasks. Heuristic evaluation is faster and cheaper but may miss problems that only appear with genuine first-time users. Usability testing finds real-world problems but may miss systemic issues that experts would catch immediately. The methods are complementary and most effective when used together.