Final answer:
Controlled usability testing takes place in controlled usability labs or temporary labs and focuses on performance measures, such as task completion time and error rates.
Step-by-step explanation:
Controlled usability testing takes place in controlled usability labs or temporary labs, focuses on performance measures, e.g., how long and how many errors are made when completing a set of predefined tasks. Indirect observation (video and keystroke logging), user satisfaction questionnaires, and interviews are also collected.
The benefit of controlled usability testing is that it allows researchers to have more control over the experiment and gather data in a limited amount of time. This type of testing is often used in the field of human-computer interaction to evaluate the usability of software or interfaces.