The Principals also determine the Level 2 structure, appoint Level 2 participants, review and approve or redirect the TTCP program, and define management procedures to facilitate operations. A Group consists of an Executive Chair, National Representatives from the participating nations, and subordinate Level 3 bodies. Within its field, a Group undertakes studies and information exchange to produce a vision, technical goals, and a work program which is then approved by the Principals. A meeting schedule is available. These elements are formed by the Group as needed, and are approved by the Principals.
Most Groups have from six to ten TPs and AGs.
Normally located in Washington, DC, these Deputies are known as the Washington Deputies. Individually, each Deputy is responsible for acting as the Group Counsellor to Groups assigned by the Deputies. The assignment as Group Counsellor will normally be for a period of three years. Each Deputy is also responsible for appointing his nation's member of the Secretariat unless his Principal elects to do so. These staff members will be known collectively as the Washington Secretariat or the Secretariat.