This article reports on the long-term involvement of research agronomists in a design process of agricultural systems in a water catchment area. While agriculture is facing increasing challenges to meet current societal expectations, several studies in agronomy have focused on the design processes that allow farmers to change their agricultural systems.

Although many agronomic researchers currently focus on designing and developing decision support systems, they rarely discuss the methodological implications of such work. In this paper, with the examples of two decision support systems, we propose methodological elements for conducting the participatory design of such tools. The authors proposition aims at building dialogue between designers and users but also between humans, tools and work situations.