Codetermination in Germany is a concept that involves the right of workers to participate in management of the companies they work for. Known as Mitbestimmung, the modern law on codetermination is found principally in the Mitbestimmungsgesetz of 1976. The law allows workers to elect representatives (usually trade union representatives) for almost half of the supervisory board of directors. The legislation is separate from the main German company law Act for public companies, the Aktiengesetz. It applies to public and private companies, so long as there are over 2,000 employees. For companies with 500–2,000 employees, one third of the supervisory board must be elected.