 Sifo is also known for one of the largest media surveys in the world – ORVESTO Konsument, for which almost 50 thousand people (out of total of 9 million citizens) are interviewed every year about their media and consumption patterns.Sifo Research International merged with TNS Gallup during 2009.According to TNS Sifo's Swedish website, the merger is part of a larger reorganisation within the Kantar Group (which in turn is owned by WPP).