A total of 14 organizations of the United Nations system now participate in the system, although at the twenty-ninth meeting of the Working Group, held in May 2004, all members agreed to make best efforts to join.
现在共有14个联合国系统参与这一体系，虽然在2004年5月机构间采购工作组第29次会议上，所有成员都同意尽力参加。