Here are 7 of the most common usability testing methods:

1. 1. Unmoderated usability testing:
   This is similar to moderated usability testing, but without a moderator present. Instead, users complete tasks on their own while their behavior is recorded and analyzed.
   
2. 2. Moderated usability testing:
   This involves a moderator observing and interacting with users as they complete tasks on a product or service. The moderator can ask questions and provide guidance, and can also take notes on the user's behavior and feedback.
   
3. 3. A/B testing:
   This involves testing two different versions of a product or service to see which performs better with users. Users are randomly assigned to one of the two versions, and their behavior is tracked and analyzed.
   
4. 4. Remote usability testing:
   This is similar to moderated usability testing, but conducted remotely using digital tools such as video conferencing or screen sharing.
   
5. 5. Card sorting:
   This involves asking users to sort a set of cards containing different features or content into groups based on their perceived relevance or organization.
   
6. 6. Tree testing:
   This involves testing the navigation and structure of a website or app by asking users to complete tasks that involve finding specific information or pages.
   
7. 7. Surveys and questionnaires:
   These can be used to gather feedback from users about their experience with a product or service, and to collect quantitative data on their behavior and preferences.
   

* Each of these usability testing methods has its own strengths and weaknesses, and the choice of method will depend on the goals of the testing and the resources available.