ITU is the leading United Nations agency for information and communication technology issues, and the global focal point for governments and the private sector in developing networks and services. For more than 140 years, ITU has coordinated the shared global use of the radio spectrum, promoted international cooperation in assigning satellite orbits, worked to improve telecommunication infrastructure in the developing world, and established the worldwide standards that foster seamless interconnection of a vast range of communications systems. One of its key mandates is to foster telecommunication development in developing countries through policy advice, provision of technical assistance, mobilization of resources and initiatives to extend access and bridge the digital divide. ITU took the lead in organizing the World Summit on the Information Society held in Geneva in 2003 and in Tunis in 2005 and has been designated to play a key facilitating role in the implementation of the WSIS Plan of Action.