Interpersonal communication networks include provision or exchange of information in the family or extended family, in the neighbourhood, in communities and ethnic groups, in various clubs and professional associations, and in conferences and meetings which are convened by governments, by organizations of all kinds, or by commercial enterprises. Speech, performance and example remain the most common, if not the only, means of transmitting information in communities where isolation, or size, or persistent illiteracy, have encouraged the survival of tradition; while in industrialized countries, traditional channels for direct communication have virtually disappeared as sources of information as more people turn to depersonalized solo "communication" with sophisticated technological devices.