(3)The mapping of a group, which would identify the group entities in the Union or in a third country and which would describe for each group entity its nature, location, the authorities involved in its supervision, the applicable prudential exemptions, its importance for the group and its importance for the country in which it is authorised or established, as well as the criteria for determining that importance, is considered a vital element for the identification of members of the college of supervisors and potential observers. In that context, information on the importance of a branch for the group and the importance of that branch for the Member State in which it is established is essential in order to determine the participation of the competent authorities of that Member State in college activities. Information on the nature of the group entities, whether institutions, branches or other financial sector entities, as well as on their country of authorisation or establishment, whether a Member State or a third country, is also important for identifying members of the college of supervisors and potential observers. For that importance to be determined, certain criteria should be set out.