rajar - 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.
barb - BARB is responsible for delivering the UK’s television audience measurement currency. they commission research companies Ipsos MORI, Kantar Media and RSMB to collect data that represent the viewing behaviour of the UK’s 28 million TV and broadband-only households. Each year, £7.5 billion is invested in the production and distribution of programme and commercial content, which is guided and accounted for by their data.
BARB collects TV viewing figures, RAJAR collects radio listener figures, NRS collects how many copies are distributed and how many readers a publication has

