In production testing, validation, and quality control, correctly defining the tolerance limits is one of the most critical factors to ensure reliability, repeatability, and yield (FPY). The test tolerance represents the acceptable margin of variation between the measured value and the expected nominal value, taking into account natural imperfections of
PPK (Process Performance Index) is a statistical indicator that measures how well a process is performing in relation to its specifications, considering real and current data, regardless of whether the process is under statistical control or not. Unlike CPK, which assesses the theoretical capacity of the process, PPK measures the
Quality Engineering is the branch of engineering responsible for ensuring that products, processes, and systems meet technical, regulatory, and customer requirements. It operates transversally across the entire production chain — from development to post-sales — promoting reliability, traceability, and continuous improvement. Quality Engineering ensures that what is designed, produced, and