Question 28/III - Cost studies for determining the basic tariff components in providing circuits for: a) sound programme transmissions, b) television programme transmissions, c) leasing of sound programme circuits, d) leasing of television programme circuits. (continuation of Question 28/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.) These studies are to be carried out on a regional basis by the regional tariff groups.