The paper reports from a comparative study on systems of quality assurance in 19 countries around the globe, and how these systems function as accountability mechanisms. Based on a theoretical framework for assessing how accountability mechanisms can contribute to build trust in the higher education sector, the analysis of the quality assurance systems underline the dominant role of quality assurance systems as the prime accountability mechanism in the sector, often accompanied by semi-autonomous agencies emphasising various forms of accreditation. Based on an assessment of the quality assurance systems it is still suggested that the current forms of accountability are not stimulating the up-building of trust in and of the sector. In the conclusion, some reflections are offered as alternatives to the current situation.