<Li> In Turkey, TV measurement is done by TNS (Kantar Media), radio by Nielsen . </Li> <Li> In the UK, television measurement is administered by the Broadcasters' Audience Research Board via a metered panel and radio by RAJAR, using a diary system . The NRS (National Readership Survey) measures newspaper and magazine readership . </Li> <Li> In the United States, TV and radio measurement is carried out Nielsen Media Research (the radio component was formerly carried out by Arbitron), and digital signage by TruMedia and CognoVision. Stratacache uses audience measurement technology to build reports for digital signage . </Li> <Li> In Vietnam, TV measurement is done by VIETNAM - TAM (co-oporation of MIC & Nielsen & AMI), Kantar Media also carry out measure TV audience since 1995 . </Li>

The major company measuring radio audiences is nielsen