  Augmented reality provides new possibilities to propose environments where
the designers can take advantage of the physicality of the artifacts while
keeping the versatility of digital environments. Mixed objects can therefore
provide new media in the interactions between stakeholders. Besides, the
increasing interest in user participation in early design phases is limited by
the poor representations or the expensive mock ups to be provided in design
meetings. Therefore, understanding the role of these mixed artifacts by
analyzing and characterizing the interactions is crucial to the development of
both design methods and environments. By focusing on multimodal interactions,
we aim at providing new results in terms of the design process, in particular
by studying the contribution of the gesture in collaborative product
co-creativity sessions but also by understanding the role of these multiple
interactions in an augmented reality environment.
