In Senegal and the Reunion Island, decentralized management of natural resources and multiplicity of land uses bring local development managers round to thinking about synergies and competition of branches and levels of organisation. There exist tools helpful to represent interactions among ecological and social systems and their dynamics. But rare of them are built with stakeholders. Domino is based on a Companion Modelling approach. From the start, this "participatory modelling approach" involves researchers of several disciplines and local stakeholders—producers of data and potential users. The project aims at reinforcing stakeholders' empowerment to tackle the stakes of their sustainable development. Sociologists involved build an analysis grid of social reality that can be used in the modelling process. Careful to the original social goal of the project, they question the appropriateness of Companion Modelling and its social uses, confronting sociological theories with field reality. This pragmatism reexamines the sociological posture.