Article 11
1. The Member States or the Commission shall instigate or together undertake any study of employment or unemployment which they consider necessary for freedom of movement for workers within the Union. The central employment services of the Member States shall cooperate closely with each other and with the Commission with a view to acting jointly as regards the clearing of vacancies and applications for employment within the Union and the resultant placing of workers in employment. 2. To this end the Member States shall designate specialist services which shall be entrusted with organising work in the fields referred to in the second subparagraph of paragraph 1 and cooperating with each other and with the departments of the Commission. The Member States shall notify the Commission of any change in the designation of such services and the Commission shall publish details thereof for information in the Official Journal of the European Union .