The collective agreement or the collective employment contract is an agreement concluded between representatives of interests of workers and employers, focused solution to the issue primarily working hours, wages, and then the other issues arising from employment or related to employment, the interest of workers and employers. At conclusion of collective agreements on workers, as interest representative, consists of one or more trade unions as workers' association or association level trade union, which can be set requirement of representativeness and real willingness and ability to protect and promote the interests of their members in collective bargaining, while on the side of employers may experience one or more employers, associations of employers or employers' level, which may also set a requirement specific representativeness