4 Levels of Documents in QMS: A system for organizing and managing documents used in quality management systems. It typically involves creating a hierarchy of four distinct levels of documents: documents that define the system itself (Level 1), procedures (Level 2), work instructions (Level 3), and forms and records (Level 4). This system helps ensure that all stakeholders are utilizing the same set of up-to-date, accurate, and valid documents to provide consistent quality management.