Evaluation of an accompanying collaborative device is a sensitive element that questions in particular the effect of the accompanying people. The literature has relied in particular on the notion of socio-cognitive conflict to support this perspective. In this article, we study the specific case of a collaborative device for veterinary student guidance with the collaboration of teachers and vet practitioners. The proposed mixed evaluation of the process and these effects shed light on the roles of these professionals from an animatic (...) perspective of groups. The asymmetries of status, the roles defined, and the social climate specific to the generation of a socio-cognitive conflict appear as essential in any accompanying collaborative device. (shrink)