The DUT failure history is the complete record of all defects, anomalous behaviors, and test statuses that a given tested product has exhibited throughout its lifecycle — from initial testing to possible field returns (RMA). This history is essential for the identification of recurring failures, technical traceability, continuous improvement, and
CAPA (from the English Corrective and Preventive Action) is a structured process aimed at identifying, correcting, and preventing the recurrence of problems or non-conformities in quality, production, or testing systems. CAPA is part of systems like ISO 9001, IATF 16949, FDA 21 CFR and other industrial standards, being essential to
The 5 Whys technique is a simple and powerful root cause analysis tool, which involves asking “why?” repeatedly (five times or more) to identify the real origin of a problem. The goal is to go beyond the symptoms and find the technical and procedural root cause, enabling lasting corrective actions.