What type of testing assesses the usability of a software application?

Usability testing falls under the category of non-functional testing, which is focused on evaluating how well a software application performs its intended functions in terms of user experience. This type of testing looks at factors such as ease of use, accessibility, and user satisfaction, all of which are critical for ensuring the software meets user needs and expectations.

Non-functional testing encompasses various forms of evaluation that do not pertain directly to specific functions of the software but rather how those functions are delivered to the end-users. By assessing usability, the testing can help identify potential user interface issues, ensure that the application is intuitive, and confirm that users can effectively navigate and interact with the software. Hence, it provides valuable insights that go beyond just checking for technical performance or functionality, aiming instead to enhance the overall user experience.