The publication illustrates various approaches to auditing and reflects on their merit, as well as outlines the implementation of audits in different higher education systems across Europe. One focus is to show common aspects and apparent deviations concerning purpose and aim of the audit, national legislation, scope of the audit, external assessments and their effects. In addition it reflects on current and future challenges and developments. Contributions from twelve European quality agencies provide an insight into their audit approaches. The publication is targeted at quality assurance agencies, higher education institutions and other stakeholders and aims to increase knowledge about different quality assurance procedures across borders.