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‪The National School System Assessment Council (Cnesco), created by law in 2013 to conduct an independent evaluation of the school system, aims to link research, evaluation, educational practices and policies. To do this, it sought to set up an original model of interaction among the stakeholders of the educational community, building consensus and aiming for change to overcome a reductionist vision of the mechanical transfer of research findings to the world of practitioners and decision-makers. Based on the reflections of research in sociology and political science on policy assessment models, but also fed by more incarnate concepts as an ideational broker and a forum of public policies, Cnesco has developed as a chamber of exchange and relay between the worlds of research and communities of practitioners and decision-makers. An experimental laboratory for six years, it has achieved a positive balance in its relations with practitioners in the field, but with more limited results in terms of its ability to feed public decision.‪