Abstract: In the frame of two European projects (INTERREG Clim'Ability Design and JPI UNCHAIN), we have studied the consequences of low waters on the inland waterway transport on the Upper Rhine Region. Considering that knowledge is not a sufficient lever for action and collaborative methods between scientists and civil society (firms, public or private infrastructure managers…) can undercome this deadlock, we employed a methodology combining semi-directive interviews, collective workshops and shared validation process. The objective was to define the impacts for the different stakeholders (exporting/importing firms, transport societies, ports…) and the possible solutions useful to put into practice (issue-driven and experience-based methodology). Co-production of knowledge raises however several challenges, since stakeholders have diverse expectations, worldviews and interests. Besides, during workshops, some processes of domination can take place and erase the diversity and subtility of opinions. That is why the contribution of each tool has to be well assessed and completed with others to elaborate a relevant impact chain and indicators of action at the collective and individual levels. Scientific expertise can then play a role to build mediation tools, analyse the results and make them "graspable" for all stakeholders.
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