RAJAR stands for Radio Joint Audience Research and is the official body in charge of measuring radio audiences in the UK. It is jointly owned by the BBC and the RadioCentre on behalf of the commercial sector.
There are currently approximately 310 individual stations on the survey and results are published every quarter.
RAJAR measures live radio listening in the UK and face to face interviews are used to recruit respondents, roughly around 100,000 people a year in fact. The Diary is still a proven method of measurement, it has strengths and weaknesses like any other methodology in research but please continue to read the above thought piece to gain more insight to why we believe that it is still the most effective method for us.