This article seeks to highlight the conditions in which organizations with different levels of ‘publicness’ interact in the framework of policy-making. In France, decision making and implementation is shared among public, semi-public and private organizations. The specific responsibility and influence of public organizations within institutional collective action however is a source of ambiguity. It becomes therefore a matter of political authority for public organizations to invest in the structuring of public problems and policies. The case analysed here shows that the publicness of implemented policies is a construction which stakeholders may try to influence. Responses by public organizations show that publicness does not only relate to the plurality of organizational forms but also to the existence of a form of hierarchy within systems of governance themselves.