A bargaining unit is the grouping of workers for the purposes of collective bargaining with an employer, typically represented by a recognised trade union. In practice, it defines which employees are covered by a collective agreement on pay, hours, and other terms and conditions of employment.In England, Wales and Scotland, the concept is central to the statutory recognition regime under the Trade Union and Labour Relations (Consolidation) Act 1992 and related regulations. The Central Arbitration Committee (CAC) (or the Scottish CAC panel) may determine whether a proposed bargaining unit is appropriate, taking into account factors such as compatibility with effective management and the desirability of avoiding small, fragmented units.In Northern Ireland, similar principles apply under corresponding industrial relations legislation, with the Industrial Court performing an equivalent role to the CAC.In Ireland, the term is widely used in industrial relations practice, although statutory frameworks differ and recognition of trade unions is largely voluntary, save in specific sectors or under particular legislation.Defining the bargaining unit correctly is a key strategic and legal issue in union recognition disputes, collective bargaining procedures and employment restructuring.