In the case studies of six OECD countries, Andrea Bernhard exemplifies the ongoing trends and changes of quality assurance systems along peer-reviewed country reports and interviews with national and international experts. The comparative analysis is based on international, descriptive, discursive, and analytical aspects concentrating on the theoretical concepts of massification, diversification, privatisation, and internationalisation. The author highlights the leading trend towards quality assurance within an international higher education area and provides recommendations to establish a functioning quality assurance system within the observed higher education systems and beyond their borders.