Solution:Television metrics in India have gone through several phases in which it fragmented, consolidated and then fragmented again.DART
During the days of the single channel Doordarshan monopoly, DART (Doordarshan Audience Research Team) was the only metric available. This used the notebook method of recordkeeping across 33 cities across India.
DART continues to provide this information independent of the Private agencies. DART is one of the rating system that measures audience metrics in Rural India.
TAM & INTAM
In 1994, claiming a heterogeneous and fragmenting television market ORG-MARG introduced INTAM (Indian National Television Audience Measurement).
Exofficials of DD claimed that INTAM was introduced by vested commercial interests who only sought to break the monopoly of DD and that INTAM was significantly weaker in both sample size, rigour and the range of cities and regions covered.
In 1997, a joint industry body appointed TAM (backed by AC Nielsen) as the official recordkeeper of audience metrics. Due to the differences in methodology and samples of TAM and INTAM, both provided differing results for the same programs.
In 2001, a confidential list of households in Mumbai that were participating in the monitoring survey was released, calling into question the reliability of the data. This subsequently led to the merger of the two measurement systems into TAM.
For several years after this, in spite of misgivings about the process, sample and other parameters, TAM was the de facto standard and monopoly in the audience metrics game.
aMap
In 2004, a rival ratings service funded by American NRI investors, called Audience Measurement Analytics Limited (aMap) was launched.
Although initially, it faced a cautious uptake from clients, the TAМ monopoly was broken. What differentiates aMap is that its ratings are available within one day as compared to TAM's timeline of one week.