Dancesport is competitive ballroom dancing, as contrasted to social or exhibition dancing. In the case of Para dancesport, at least one of the dancers is in a wheelchair. Dancesport events are sanctioned and regulated by dancesport organizations at the national and international level, such as the World DanceSport Federation. The name was invented to help competitive ballroom dancing gain Olympic recognition. The physical demand of dancesport has been the subject of scientific research. The first unofficial world championship took place in 1909, and the first formation team was presented in 1932 by Olive Ripman at the Astoria Ballroom, London. Dancesport was first broadcast on TV in 1960. The term dancesport applies to the International Style as well the as American Style of competitive ballroom. It includes the following categories: International Standard International Latin American Smooth American Rhythm These categories apply to both individual couples and formation dance. World Dance Council The World Dance Council (WDC) is a registered limited company, and the legal successor to the International Council of Ballroom Dancing (ICBD), which was formed in 1950 in Edinburgh. The WDC operates through a general council and two committees: The World Dance Sport Committee regulates professional dancesport at the international level. The World Social Dance Committee "deals with all matters of the dance profession that relate to the activities of Dance Schools and Dance Teachers". It does not regulate social dance directly – that is the business of individual organisers, the dance teacher organisations, such as the Imperial Society of Teachers of Dancing, and the chains of dance teaching schools in the United States. In 2007 the WDC Amateur League was created. This organisation runs a number of competitions and has its own world ranking system for amateur dancers. Each member country in the WDC has its own national organisation, such as the British Dance Council, which acts as a forum for the many interested parties in that country.