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This article analyses interdisciplinarity as it was practiced or created conflicts within the realm of a collective project, the GIEAN (Groupe Interdisciplinaire sur l’Électricité Atmosphérique Naturelle), which brought together a panel of researchers from different disciplines to identify obstacles on the one hand, and heuristic and epistemological contributions on the other hand. The meetings and exchanges provided most of the material analyzed by the two authors, who were also participant-observers of the project. This article provides a threefold analysis: that of the genesis of the project, of the first meetings and the institutional formalization; that of the objects of study, their construction by the different disciplines, which revealed different research timeframes, but also the implicit — or sometimes explicit — unconsidered hierarchies of the disciplines, revealing different but not entirely opposed regimes of truth and scientific proof. The third analysis finally questions the multiple effects of interdisciplinarity on the project, the disciplines, and the researchers, but also the research structure that supported and accompanied the project — in this case the “Maison des Sciences de l’Homme (MSH)” — to lead to, in the form of an epilogue, the manner in which this article was received by the co-sponsor of the project. From start to finish, this paper presents a writing style centered on interdisciplinary encounters and practices, because if the results of funded research projects are those most often published, the approaches, obstacles, implicit prejudices, and epistemological contributions — in short, everything that forms the record and infra-narrative of a project — are rarely questioned and capitalized on. But is not the discipline of science also about knowing how to communicate by questioning what is communicated?