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In this paper we present our approach to the evaluation of multimodal applications by using participatory design workshops. Our goal is to obtain user feedback for our design on a fundamental, conceptual level. We propose in this paper the use of design ideas coming from the users, not only by translating them one-to-one into design but also by analyzing them in order to reflect on the design concepts behind the artifacts being constructed. By providing examples of workshops conducted, we show a methodology that helps in exploring the design space and that has the potential of producing more interesting jumps inside the design space, towards more a satisfying user experience.