On 23rd June 2016, the United Kingdom held a referendum and decided to leave the European Union – an unprecedented decision in European history. The collection of articles below provides in-depth analysis of the major points of discussion. Our ‘Understanding Brexit’ section is now amended by new contributions looking at the aftermath of Brexit. What does Brexit mean for other European countries and what impact will it have on the future of European integration? In cooperation with the Macroeconomic Policy Institute of the Hans-Böckler-Stiftung and the Bertelsmann Stiftung Social Europe has prodcued a series of articles and interviews looking at these crucuial questions.