Foelstad and Hornbaek studied the use of Cooperative Usability Testing in the development of two work-domain specific systems. As modifications to the original method, they included an interpretation phase after each task, and used task-scenario walkthroughs instead of video recordings as the basis for discussions. The latter modification was made to bring more flexibility to the discussions and to enable comments also on parts of the system that were not used in performing the tasks. In the interpretation phase, the authors used a set of predefined questions focusing on potential problems, desired changes and well working solutions.
The results of the studies indicated that the interpretation sessions offered an opportunity to broaden the scope of usability issues to cover also user needs and requirements in addition to issues related to static design and interaction design brought out in the interaction sessions. Based on their experiences, the authors recommend to use the interpretation sessions to gain additional insight into observed problems without leading the user, and to look for new requirements and also new solutions.