Each EACO member country has different organisation in their data collection and exploitation sources. Indicators come from two main sources: (1) operator´s data (supply side) and (2) survey based data (demand side), usually run by the National Statistical Institute (NSO) in each country. Each source of data has different periodicities, responsibilities and problems in their collection. Supply side data is being collected by each regulatory authority on a periodic basis, mostly quarterly. Some indicators by their own nature are difficult to obtain or does not make sense to collect on a high frequency basis, as revenues, investment, spectrum allocation, coverage of networks, and are very often collected only on annual basis.