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This article focuses on how the constructive interac-tion method helps system designers determine whether the basic concepts underlying a system are well understood by users and whether its implementation, usability, and utility are satisfactory. We describe our experiences in using a form of constructive interaction to test a software package that supports a particular collaborative activity. The difference between our use of the constructive interaction method versus other models is that our test subjects use separate workstations in the same room to discuss their common tasks. Having thus adjusted the setting to the specific characteristics of computer-supported collaborative work, we asked each person to carry out separate sets of predefined tasks that were linked. Simply asking people whether they are satisfied with a newly introduced system does not suffice, because the reasons they give may not reflect their …