Data integrity has become a major challenge but also a chance for modernization and optimization. To comply with expectations and regulations, companies need to analyze their overall GMP data management, system landscape and related GMP data flows. The following article outlines a basic data-flow oriented approach for such data assessments, as well as considerations for compliant and proper data categorization, how to define different useful types of audit trails and how to define and understand the so called “Audit Trail Review” in order to gain knowledge about the product and process attributes according to ICH Q10 and Q11. (…)