Question 27/III - Cost studies for determining the basic tariff components for telecommunication services (telegraph, telephone, telex, data, etc.) (continuation of Question 27/III studied in 1985-1988) (Permanent Question; however, the permanent character of the Question does not imply the obligation to begin a new study during each study period.) Cost studies for fixing the basic components of tariffs (for international accounting purposes) in telecommunications services (data, telegraph, telephone, telex, etc.). The studies are to be carried out on a regional basis by the regional groups set up by the IVth Plenary Assembly of the CCITT to deal with international tariffs, namely: - Regional Tariff Group for Africa (TAF); - Regional Tariff Group for Latin America (TAL); - Regional Tariff Group for Asia and Oceania (TAS); - Regional Tariff Group for Europe and the Mediterranean Basin (TEUREM).