The document discusses methods for usability evaluation when domain knowledge is needed but unavailable to evaluators. It reviews studies comparing evaluations done by domain experts versus usability experts. Domain experts identified more domain-specific issues and their findings were given higher priority by clients. Methods like cooperative usability testing that include dialogue with users allow access to users' domain knowledge and identify a broader range of usability issues compared to observation alone. Accessing user domain knowledge through evaluation methods pays off the most for usability evaluations in highly specialized and exclusive domains where the knowledge is otherwise unavailable.

5. What we may miss if the user knows more of the domain than the usability evaluator: Review of two studies of usability evaluation methods that allow us to access the users’ knowledge.

10. Why did it pay off to access the users’ knowledge in these cases?

12. In conclusion: When doing usability evaluation in exclusive domains … … consider using methods that allow you to access the domain knowledge of users