Whether in terms of publications, data or software resulting from research, the issue of open science is finding a growing echo in national and international academic policies, as well as in their implementation by research operators. Nevertheless, humanities and social sciences appear to be lagging behind this movement, including in France, as shown by the French Open Science Barometer. Faced with this observation, this project has two joint objectives: firstly, to gain a better understanding of the explanatory factors, obstacles and potential levers for action relating to the opening up of science in the humanities and social sciences disciplines, and secondly, to experiment - within the framework of action research - with levers for action likely to increase the involvement of humanities and social sciences communities in open science practices. In this context, the Université de Lorraine is positioning itself as an interdisciplinary field of research and hopes to be able to enrich its practices for supporting researchers and to benefit all humanities and social sciences communities in France and internationally.