The partnership research (SSHRC 2019-2022) discussed in this article is situated at the intersection of several theoretical and practical fields – adult francization, museum education, and environmental education. Based on the methodology of research and development (Loiselle and Harvest, 2009), this partnership research aims to design, test, and then evaluate, with a view to improvement, an interdisciplinary museum educational program at the Musée des sciences et de la nature de Sherbrooke (MNS2), adapted to allophone adults, that integrates pre-visit and post-visit educational activities with the museum visit. Our article reports on the results of the data collected during the diagnostic stage analysis. The data collection strategies used were focus groups and individual interviews, involving all participants: French learning adults, francization teachers and the museum animators. This diagnostic stage shows, among other things, that the educative potential of the studied museum activity would be better actualized if incorporated within a richer educational scenario, on one hand, and if linked with francization programs, on the other.