Since it introduction in 1985, the Telecontrol system has been produced and sold over 55,000 times .The devices have been installed successfully in more than twelve countries.The quality and precision of the telecontrol system is demonstarted every day in the more than 18,000 households where it is in operation to measure TV viewing habits . The systemComprises more than eight digital panels with over 2,500 perticipan- ts. The Radio control watch has been produced more than 5,000 times. In Switzerland, a panel that is used to Determine radio-audience figures has been in place since 2000.Since then, the Radiocontrol and Media control systems have passed various practical tests and pilot projects in several countries with flying colours.