The County council ("Conseil General") in partnership with consular organisations, employers’ groups, professional unions, State service and local authorities have favoured establishing structures to accommodate companies: business incubators , company "hotels" and rental workshops, support to market lots designed to accommodate economic activity, requalification of activity centres, support for technology transfer, assistance missions for export, and active participation in pro-fessional exhibitions.

Since 1972, the Val d’Oise County Council has been equipped with an economic tool for company support and economic promotion of the department serving local development: the Val d’Oise Economic Expansion Committee (CEEVO). This organisation is ISO 9001 certified for all of its company management activities (assistance in business establishment, creation, development, and internationalisation - creation of studies and economic and statistic documents).