The population comprises all persons represented by the sample of a survey. In the AGF system, the population depends on the selected market standard. In the TV market standard, it consists of persons aged 3 and over in private households with a German-speaking main income earner and at least one TV set in use. In the moving image market standard, people in private households who do not have a TV set but have at least one streaming-capable device in the household, so-called non-TV households, are added.

USB is an acronym that stands for Universal Serial Bus. It refers to a standard for the connection of external devices such as hard drives or USB sticks to computers and modern TV sets.

Weighted number of persons or households that have fulfilled a minimum usage condition for an evaluation element. Regardless of the frequency of contact, a user is only counted once.

User-centric measurement is an approach to measuring audience reach. The measurement refers to the user groups of media and is mainly carried out as a panel-based measurement approach.