...
As the evaluators find usability problems, they describe the problem, list the heuristic violated, and rate the severity of the problem, often on a scale of 0-4, from "not a usability problem at all" to "usability catastrophe; imperative to fix." (More information on ratings can be found at: Severity Ratings for Usability Problems.) Usability problems can then be ordered by severity, the proportion of the users experiencing the problem, and the impact of the problem on users who experience it to determine which problems must be fixed immediately and which fixes can be deferred, if necessary, to the next round of development.
Heuristic Principles for Usability and Accessibility
Experts in usability and accessibility have compiled lists of principles - often expressed as questions - to be applied in performing heuristic analysis. The following are recommended by the Fluid project:
- Heuristic Analysis - A System Checklist is a useful table of principles, created by Deniese Pierotti of Xerox Corporation.
- Usability Evaluation Questions is a list developed by members of the Fluid project to address both usability and accessibility.
- 10 Nielsen and Molich Usability heuristics is a well known set of principles, presented in a form refined by Jakob Nielsen.
For illustration purposes, here is an excerpt of from the Nielsen and Molich list:
...