Throughout the industrialised world trade unionists are reforming their organisations as part of a strategy to adjust to new labour market, economic and political circumstances. This volume examines the role of merger activity in this process of reform. The book identifies the pattern of merger activity, the factors that promote its development and its impact on union structure and governance. Most merger activity is shown to originate in some adverse environmental change, such as membership decline. Furthermore, there is little evidence to suggest that mergers have improved union performance in the recruitment, retention and organisation of members, although, in some cases, the reform of systems of