1. After consulting the other supervisory authorities as set out in Article 344(1) and (2), the group supervisor shall make its own decision on the application. The group supervisor shall provide its decision to the participating undertaking and the other supervisory authorities involved in the assessment of the application. The decision shall be written in an official language of the Member State of the group supervisor.

2. Where the supervisory authorities involved in the assessment of the application comprise supervisory authorities from more than one Member State, the group supervisor shall, after consultation with the other supervisory authorities and with the group itself, provide the decision referred to in paragraph 1 in another language most commonly understood by the other supervisory authorities involved.

3. After consulting the other supervisory authorities as set out in Article 344(1) and (2), the group supervisor may require the applicant to submit a realistic transitional plan to extend the scope of the internal model.

4. When an internal model has been approved under Article 230 of Directive 2009/138/EC for the purposes of the calculation of the consolidated group Solvency Capital Requirement, any subsequent application for permission to use the same internal model for calculating the Solvency Capital Requirement of an insurance or reinsurance undertaking in the group shall follow the procedure laid down in Article 231 of Directive 2009/138/EC.