What does usability testing evaluate?

Usability testing specifically focuses on assessing how easy and user-friendly an application is for its intended audience. This process involves observing real users as they interact with a system to identify any issues they face while performing tasks. By concentrating on the user experience, usability testing helps ensure that the application meets the needs of its users, making it intuitive and straightforward to navigate.

In contrast, the other options address different aspects of application evaluation. Speed and efficiency pertain to performance metrics rather than user experience, while security measures focus on how well the system protects data and resist breaches. Technical specifications relate to the underlying architecture and features of the application, which do not inherently reflect usability. Therefore, the correct answer highlights the core purpose of usability testing, which is to enhance user satisfaction and overall experience.