This paper reports on the experimentation of a collaborative learning approach in university training for a Master's degree in "Pedagogical and Multimedia Engineering". It is carried out with learner-teachers training in Instructional Design. The approach adopted focuses on the complexity of the collaborative situation, and is based on three andragogical models: shared cognition, self-directed learning and transformative learning. The aim of this study is twofold. On the one hand, to assess the relevance of a totally collaborative approach that fully integrates students into their learning. On the other hand, to design a collaborative model in the form of a grid that can be used to assess the collaborative potential of a learning situation. The indicators evoked by the collaborative groups in relation to each component of the model they developed reflect their level of appropriation of the model, and the impact of the approach on the development of skills for analyzing and designing learning situations.