The Arria Formula Meeting enables a member of the UN Security Council to invite other Security Council members to an informal meeting, held outside of the Council chambers and chaired by the inviting member. The meeting is called for the purpose of a briefing given by one or more persons, considered as expert in a matter of concern to the Council. An Arria Formula meeting is an informal event that allows for more interaction between the Security Council members, civil society, UN agencies and other sectors on international peace and security issues.