The Core Group consists of 17 members, of which 6 seats are reserved for the chairs of the regional Green Light Committees (rGLCs), 4 observers and the secretariat. The rGLCs, aligned with the 6 WHO Regions, have been established to provide decentralised technical assistance to countries in scale-up of MDR-TB services, and hence will form an important link between the GDI's CG and countries, providing an opportunity for experience sharing and apprising the GDI's CG members of ground realities and challenges.