Abstract
This text is a contribution to the vast debate on interdisciplinary research that is unfolding with increasing intensity. Through the co-authors’ personal and original trajectories, it aims to understand “from the inside” the role of interdisciplinary practice in the scientific construction of researchers and, thus, to bring a more positive vision of this practice often portrayed in a negative light (difficulties, pitfalls, etc.). The concrete examples of crossing boundaries between the natural and social sciences demonstrate the diversity and the plurality of forms these interdisciplinary trajectories may take. Yet, through this diversity, some common features emerge. Interdisciplinarity developed simultaneously with the shaping of the scientific identity of each individual. This distinctive construction is probably linked to a certain closeness with the “field” in all its physical and social dimensions. It is also most certainly the result of a hybridization between individual backgrounds and the diversity of scientific and cultural experiences of the colleagues involved in the collaborations. This reflexive feedback provides some elements of objectivation for the analysis of interdisciplinary practice, particularly around the role of decentring and reflexivity in interdisciplinary trajectories.