The "Ambition numérique" ("digital ambition") report is the conclusion of an open debate with the French citizens in order to prepare the government's digital strategy. The report formulates 70 proposals divided in four parts : fairness and freedom in a common digital environment; a new form of public action: openness, innovation, participation; fostering French growth for an innovation-driven economy; solidarity, fairness, empowerment: the challenges of a digital society. During five months (october 2014 - february 2015), the Conseil National du Numérique (French Digital Council) animated a wide consultation on the "digital ambition" of France, in order to collect proposals and plans for action to make of the digital an asset as much for economy as for society. This mission, assigned to the CNNum by the French Prime Minister in september 2014 and followed by Axelle Lemaire, Secretary of State assigned to the Digital, and Thierry Mandon, Secretary of State to the Reform of the State and to Simplification, is an unprecedented experimentation of public policy building. The platform www.contribuez.cnnumerique.fr conceived with the association Démocratie Ouverte permitted to each citizen, public or private organisation to contribute to the proposed consultations. At the end of those consultation phases, the CNNUM published syntheses open to comments for each consultation, tracing back the great controversies that emerged while staying as neutral as possible and studying the proposed plans for action. During the concertation, 4 "journées contributives" ("contributive days") have been organized on each of the themes - respectively in Lille, Strasbourg, Bordeaux and Nantes - in presence of local actors. During those days, thematic workshops permitted to deepen the proposals seen on the online platform, and to confront them to participants' feedback. In parallel, "contributive pitches" gave the opportunity to entrepreneurs, studens, members of civil society, law professionals, etc. to present their innovations and to propose their ideas to "update France". A concertation on the network, mobilizing various actors: to stimulate the production of collective ideas, the CNNum developed, while being accompanied by the start-up Nod-A, a DIY resource kit, offering the possibility for actors to organize themselves workshops on the consultations of their choice. The CNNum has also brought their support on methodological and background subject grounds (from a distance or on the spot) to ensure a good appropriation of the tools and of the addressed problems. Organizers, on their side, engaged themselves to post their contributions on the platform at the end of those workshops. A regular followup of the concertation with the government: to ensure the coordination of the concertation's progresses with the government's work (preparation of the digital bill, elaboration of action plans), weekly points were held, gathering the CNNum and the ministerial cabinets of the Prime Minister, Axelle Lemaire and Thierry Mandon. Interministerial meetings were also organized to spread the concertation in administrations.