From A for AGF Videoforschung to Z for zapping, the most important technical terms in video research are explained here.

Weighted number of persons, households that have seen the analysis element at least one time. Each person is included in net coverage only once, regardless of their contact frequency. The minimum usage unit is one second.

The Nielsen Company is an international market research company that has its German headquarters in Frankfurt am Main. Nielsen is a service provider for AGF in the area of video streaming measurement.

Non-TV households comprise the population of private households with a German-speaking main income earner, in which no TV set is in usage, but at least one streaming-capable device is available (PC, laptop, smartphone, tablet).

In the fusion, non-TV households serve as recipients of streaming usage measured in the desktop panel or the mobile panel. In addition, the measurement via router technology will be successively expanded in non-TV households, so that in future it will also be possible to record the original usage on the streaming devices available in the household.

Non-linear television refers to the use of television content independently of the broadcast time and programme flow. This can be done by using recording devices, with the aid of which content can be used later than the broadcast time, or by means of an individual selection of content made available on the Internet independently of the broadcast time (VoD).

Non-linear video ads are a sub-category of in-stream video ads in which the advertising messages overlap a part of the video content. In this case, the ad placement is non-linear, meaning that it runs concurrently with the video content. Non-linear video ads are further sub-divided into overlay ads and branded players.

Non-users are a segment of persons differentiated from the reporting basis who have not watched a programme or several programmes. The viewing duration is equal to 0.

The unweighted number of persons, households or devices, given boost factor 9 in the video market standard.

Number of elements is defined as the number of researched elements in the evaluation. These can be, for example, programmes, time intervals, advertising islands or offering units. Since the fact indicates the number of e.g. programmes, time intervals, advertising blocks and offering units, the fact "Number of programmes" was renamed "Number of elements".

This term describes the number of different evaluation elements that are considered in the respective analysis cell. Number of titles is independent of the actual usage of the programmes. The uniqueness of e.g. a TV programme is determined by its title (text). The uniqueness of a streaming programme is determined by various information in the C variables.