TV viewership is measured either by the diary method or meter method. The diary system used until 1996 consisted of putting a diary in TV viewing households to record viewership. In this method, there were quarter hour slots across the rows and the channels across the columns in the diary. This diary was given to a panel of households. The programmes viewed in different time slots across the channels were jotted down in the diary. In essence, it is a reporting system. Sometimes, the diary entries were made at the end of the week. The reported entries may not be correct — a programme not watched might be reported. There were chances of popular programmes being reported, and chances of omitting the new shows, in spite of viewership. This is called telescopic effect. The meters or peoplemeters were introduced in 1996. These have two units — a recording device attached to a TV set, and a remote which helps the family to log in and log out. The recording device actually records the viewing, and this distinguishes it from the diary method. The two reporting systems in India are TAM and Amap.