(9)Competent authorities should communicate information on any cooperation arrangements with third country supervisory authorities that are not already known by ESMA following its involvement in the negotiation of multilateral memoranda of understanding. To be able to assess the operation of cooperation arrangements, it is important to gather information about the effectiveness of such cooperation arrangements, such as quantitative and qualitative information on the use made of the various powers foreseen in those arrangements. This includes requests for information, on-site visits and information sharing. Effectiveness of cooperation should be assessed in terms of relevance, detail, timing and completeness of the assistance received.