What happens when boundary organisations do not exist? Boundary work, as the constant negotiation of scientists and policy makers’ role to solve international problems, has been the knot between actors, institutions and scientific knowledge on a diversity of international issues. Related to boundary work, boundary organisations are understood as the institutions linking scientific research to policy making. As a matter of fact, they are expected to allow decision makers to shape and articulate policies on a consensual scientific ground. Within the dynamics of boundary organisations, the knowledge production of scientists and policy makers are compared, negotiated and differentiated or, to the contrary, harmonised or blurred for the sake of cooperation.