This training material is designed to equip you with the essential knowledge and tools required to ensure compliance with the EHDS Regulation, particularly with regard to the responsibilities of Health Data Access Bodies (HDABs) in relation to data quality, the relationship between metadata and data quality, and an overview of the usefulness of the Data Quality and Utility Label (DQUL) for the secondary use of health data. By exploring key concepts, the roles of stakeholders, best practices and practical challenges, you will gain a comprehensive understanding of how to manage, assess and maximise the value of health data through improved data quality in the context of the EHDS framework.