This research explores the nature of interaction between unions and management in a workplace with two questions: How is the union-management interaction formalised or constructed? How does the union-management interaction take place? Five theories have been reviewed to draw on the nature of interaction. One unionised as well as privatised enterprise has conducted observant participation and in-depth interviews. The findings discuss how the authority of government deeply influences the union-management interaction; unions consolidate their power and resources to change the asymmetrical relationship with management; and how management actively interacts with unions to bring them into the fold. Nevertheless, cooperation and conflict are counterparts of the union-management interaction. Unions and management continually conflict and compromise to accumulate their own power and resources.