The Dutch football league system consists of two fully professional leagues (Eredivisie and Eerste Divisie) and eight levels of amateur football leagues, the highest of which is called Tweede Divisie, formerly Topklasse. All the leagues are connected by a promotion and relegation system, but in order to be promoted to the Eerste Divisie a club has to submit a solid business plan to be approved by the Royal Dutch Football Association, as well as meet certain stadium demands, and some other demands that the association stated for all the teams in the top two leagues. That way it was possible that the IJsselmeervogels won the 2010–11 Topklasse, but was not promoted, because they did not want to be bound to these demands. FC Oss was promoted instead. The association obliges every team from the