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The release of Microsoft's HoloLens headset addresses new types of issuesthat would have been difficult to design without such a hardware. Thissemi-transparent visor headset allows the user who wears it to view theprojection of 3D virtual objects placed in its real environment. The user canalso interact with these 3D objects, which can interact with each other. Theframework of this new technology is called mixed reality. We had theopportunity to numerically transform a conventional human nutrition workshopfor patients waiting for bariatric surgery by developing a software calledHOLO_NUTRI using the HoloLens headset. Unlike our experience of user andconventional programmer specialized in the development of interactive 3Dgraphics applications, we realized that such a mixed reality experiencerequired specific programming concepts quite different from those ofconventional software or those of virtual reality applications, but above allrequired a thorough reflection about communication for users. In this article,we propose to explain our design of communication (graphic supports, tutorialsof use of material, explanatory videos), a step which was crucial for the goodprogress of our project. The software was used by thirty patients from LePuy-en-Velay Hospital during 10 sessions of one hour and a half during whichpatients had to take in hand the headset and software HOLO_NUTRI. We alsoproposed a series of questions to patients to have an assessment of both theadequacy and the importance of this communication approach for such experience.As the mixed reality technology is very recent but the number of applicationsbased on it significantly increases, the reflection on the implementation ofthe elements of communication described in this article (videos, exercise oflearning for the use of the headset, communication leaflet, etc.) can helpdevelopers of such applications.

Implementation of communication media around a mixed reality experience with HoloLens headset, as part of a digitalization of a nutrition workshop