From A for AGF Videoforschung to Z for zapping, the most important technical terms in video research are explained here.
In the AGF system, the broadcast day begins at 3:00 in the morning and lasts until 3:00 the following night. All broadcasts in this time period are given the same calendar date. According to this definition, the date change takes place at 03:00 in the morning. This division, which deviates from the usual calendar, has proved to be expedient for programme and advertising planning because of audience behaviour. This ensures, among other things, that when data is retrieved at night, all data on television usage of the previous television day can be retrieved simultaneously and reported in the morning.
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