This first chapter, as an introduction to the whole book, summarises how growing inequality in Europe may have emerged from mechanisms in the world of work, with a particular focus on the possible role of social dialogue and the social partners – and more generally industrial relations – in reducing inequalities. The chapter first presents some major lessons from the national chapters and summarises their contributions to the existing research: How did national industrial relations systems address inequalities over time, and what have been their effects on various sources of inequality? This introduction also reviews some concrete outcomes of collective bargaining at national, sectoral and firm level that may have helped to reduce inequalities. It extends for this purpose the number of countries (beyond those covered by national chapters) in order to provide the most extensive overview of such outcomes. Third, this introduction complements the national stories with a comparative statistical analysis from the European Structure of Earnings Survey (SES, Eurostat) to more accurately identify specific effects of collective pay agreements on pay inequality, working time distribution and work contracts. Finally, this leads us to a number of policy considerations, which are presented briefly in the closing section and further developed in the national chapters.