Collective bargaining is a process of voluntary negotiation between employers and trade unions aimed at reaching agreements which regulate working conditions. Collective agreements usually set out wage scales, working hours, training, health and safety, overtime, grievance mechanisms and rights to participate in workplace or company affairs.[1]

The union may negotiate with a single employer (who is typically representing a company's shareholders) or may negotiate with a federation of businesses, depending on the country, to reach an industry wide agreement. A collective agreement functions as a labor contract between an employer and one or more unions. Collective bargaining consists of the process of negotiation between representatives of a union and employers (generally represented by management, in some countries[which?] by an employers' organization) in respect of the terms and conditions of employment of employees, such as wages, hours of work, working conditions and grievance-procedures, and about the rights and responsibilities of trade unions. The parties often refer to the result of the negotiation as a collective bargaining agreement (CBA) or as a collective employment agreement (CEA).
http://en.wikipedia.org/wiki/Collective_bargaining

http://tinyurl.com/3act2ve