(19)The Convention provides that each Party is to draw up, update and endeavour to implement, as appropriate, a plan for the implementation of its obligations under the Convention. Member States should provide opportunities for public participation in drawing up, implementing and updating their implementation plans. Since the Union and the Member States share competence in that regard, implementation plans should be drawn up and updated both at national and Union level. Cooperation and exchange of information, including on sites contaminated by POPs, between the Commission, the Agency and the authorities of the Member States should be promoted.