This volume contributes to diversity research within communication studies taking into consideration the representation and implementation of social and cultural diversity in the public sphere, particularly in the mass media. In the first part, concepts of diversity are outlined with respect to a normative claim. In the second part, the focus lies on particular political decision-making and implementation of diversity measures in media regulation, public diplomacy and science. The last part presents analyses regarding the construction of diversity in internationally traded TV programmes. Carola Richter is Junior Professor for International Communication at Freie Universitaet Berlin. Indira Dupuis is Senior Researcher in the Project Media Functions in Transition - Eastern Europe 1989 and North Africa 2011 in Comparison at Freie Universitaet Berlin. Stefanie Averbeck-Lietz is Professor for Communication and Media Studies at the University of Bremen.