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Put into a competitive universe since a long time, radio is the first media that has given itself an audience measurement system, as soon as 1949. Médiamétrie, in charge of audience measure for national and local radio stations, now proposes two complementary tools. The “75 000+ survey” (referring to the number of people interviewed per year), made each day by phone, is focused on the last 24 hours listening. The panel, which is periodic, requires a same sample to fill in, during three weeks, a listening diary. Indicators used in radio either count up individuals, whatever their listening time is (coverage), or audiences, that is to say “listeners x quarter of an hour” (rating, share).Since the end of 2002, listeners from 13 to 15 years old are taken into account. Passive metering (thanks to clocks) could in a little while replace surveys, based on listener’s memory.