Which type of usability testing involves direct interaction with users in real-time?

Moderated testing is the correct choice because it involves direct interaction with users in real-time, typically facilitated by a moderator or facilitator. During this type of usability testing, the moderator can ask questions, observe user behavior, and provide assistance as needed, allowing for deeper insights into user experiences and issues that may arise.

In this setting, the moderator can adapt the testing process based on user feedback and interactions, leading to more dynamic discussions and a comprehensive understanding of user needs and usability concerns. This immediate interaction helps capture qualitative data effectively and allows the moderator to probe further when interesting responses or observer behaviors occur.

Other options, like remote testing, typically involve users participating in a study from their own locations but may or may not be moderated. Unmoderated testing generally lacks real-time interaction, allowing users to complete tasks independently without immediate guidance or feedback. Online surveys also do not involve direct interaction; they gather responses asynchronously and do not provide the real-time engagement that moderated testing offers.