The regulation of the labour market by industrial-relations institutions has been an important theme in sociology, political science, economics, and jurisprudence. What has particularly attracted attention from a comparative perspective is the astonishing variety of national labour-relations institutions. This variety, when confronted with persistent economic internationalization raises two main questions. First, does internationalization impose pressures for change and, more specifically, for convergence on institutions? If such pressures are at work, is there a superior model the national systems are converging on? Second, under economic internationalization, cross-national differences in national arrangements may have an increasing impact on national economic performance. Hence the question is whether national labour-relations systems perform differently, and to what extent their performance has changed over time due to shifting circumstances. This book investigates these questions on the basis of a cross-national comparison, including comparable data from twenty OECD countries.