All these dances can be danced socially, more or less any way people want to. As competition dances, they are organised under the rule of the World Dance Council. These competitions are danced in the "International style"; the techniques were developed by English dancers in the 20th century. All major international competitions are conducted under detailed regulations. There are other systems of dance regulated by national bodies. American style is one; Scottish dancing is another; Greek classical dance is another. 