(2)To ensure a coherent application of Article 48 of Directive (EU) 2019/2034 across the Union and thus fair conditions of competition, it is important to promote convergence in the practices of group supervisors regarding the establishment of colleges of supervisors for investment firm groups. In particular, since the establishment of colleges of supervisors is left to the discretion of the group supervisor determined in accordance with Article 46 of Directive (EU) 2019/2034, it is essential to set common criteria that group supervisors should take into consideration when determining whether a college of supervisors should be established. Those common criteria should include proportionality criteria, reflect the need to facilitate supervisory tasks, and facilitate coordination between, and cooperation with, relevant third-country supervisory authorities, in particular where such coordination and cooperation is needed to exchange relevant information on the margin model with the supervisory authorities of the clearing members of the qualifying central counterparties (QCCPs) or the supervisory authorities of the QCCPs, and to update such information.