The design of an output multimodal system is a complex task due to the richness of today interaction contexts. The diversity of environments, systems and user profiles requires a new generation of software tools to specify complete and valid output interactions. In this paper, we present a multimodal output specification and simulation platform. After introducing the design process which inspired this platform, we describe the two main platform's tools which respectively allow the outputs

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... ication and the outputs simulation of a multimodal system. Finally, an application of the platform is illustrated through the outputs design on a mobile phone application.