Internal Market Information System
Article 21
1. The administrative cooperation and mutual assistance between the competent authorities of the Member States provided for in Articles 6 and 7, Article 10(3), and Articles 14 to 18 shall be implemented through the Internal Market Information System (IMI), established by Regulation (EU) No 1024/2012. 2. Member States may apply bilateral agreements or arrangements concerning administrative cooperation and mutual assistance between their competent authorities as regards the application and monitoring of the terms and conditions of employment applicable to posted workers referred to in Article 3 of Directive 96/71/EC, in so far as these agreements or arrangements do not adversely affect the rights and obligations of the workers and undertakings concerned. Member States shall inform the Commission of the bilateral agreements and/or arrangements they apply and shall make the text of those bilateral agreements generally available. 3. In the context of bilateral agreements or arrangements referred to in paragraph 2, competent authorities of the Member States shall use IMI as much as possible. In any event, where a competent authority in one of the Member States concerned has used IMI, it shall where possible be used for any follow-up required.