Temporary agency work is an important and rapidly expanding form of employment throughout the European Union. Its regulation continues to be a contentious issue, as the demands of employment creation and flexibility need to be balanced with employment protection and security for workers. This report, based on findings from a comprehensive survey carried out by the European Industrial Relations Observatory, presents an overview of the situation in 28 countries - the 25 EU Member States, Norway and the acceding countries of Bulgaria and Romania. It explores a range of issues including the definition and extent of temporary agency work, its regulation in the different countries, both by law and collective agreement, and the views of the social partners on developments in the sector. Despite differences in the type of regulatory approach, it finds a surprising degree of similarity between the former 15 'old' Member States and the 10 new Member States - although the absence of sector-level bargaining in the latter group of countries is a significant distinguishing feature.