In regulated manufacturing, "major" vs "minor" nonconformities are risk-based classifications, not universal legal terms. A major nonconformity typically indicates a systemic, repeated, or high‑risk failure that can impact product conformity or the QMS’s effectiveness. A minor is limited in scope or risk. Exact criteria depend on your QMS procedures, standards (e.g., AS9100, ISO 9001), auditor guidance, and evidence. Clear definitions, traceability, and consistent use across NCR, CAPA, and audit workflows are essential to avoid misclassification and unintended regulatory or customer impacts.