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

Broadcasting day

In the AGF system, the broadcasting day begins at 3:00 a.m. and lasts until 2:59 a.m. of the following day. All programmes during this time interval are assigned to the same calendar date. Under this definition, the data change occurs at 3:00 in the morning. This division of time, which differs from the customary calendar definition, has proved to be expedient for programme and advertisement planning by reason of viewer behavior. Among other things, this ensures that all data on TV usage during the previous television day can be retrieved at the same time during the night and reported in the morning.

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