All proposals for Appointed Experts require approval by an Executive Director or more senior official of the CBB. The appointment will be made in writing, and made directly with the experts concerned. A separate letter is sent to the licensee, notifying them of the appointment. At the CBB's discretion, a trilateral meeting may be held at any point, involving the CBB and representatives of the licensee and the Appointed Experts, to discuss any aspect of the investigation.