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typing Cognitive modeling can provide important insights about the usability of software or hardware products at all stages of product design. It is not used very often, though, as the creation of cognitive user models is typically done by highly trained experts. These specialists need not only develop the models, but have to spend a lot of additional time on software interface problems: The cognitive models need to be connected to the interactive system under evaluation. This paper presents ACT-CV, a software library that aims at solving the interface problems of user modeling especially in usability research