Download the “ACAS Code of Practice on Disclosure of Information to Unions for Collective Bargaining” (PDF, 469KB) After certification, a union has the right to bargain collectively on behalf of the workers it represents. In most cases, the end result of these negotiations will be a collective agreement, a contract between the union and the employer on the terms and conditions of employment of the workers in the bargaining unit. A collective agreement is a legally binding document that binds all parties involved. The right to collective bargaining is recognized by international human rights conventions. . . .