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zero quality control (ZQC)

Quality practices aimed at achieving zero defects and therefore eliminating the need for ad-hoc control. It is based on the recognition that people will make mistake and the principle that defects can be prevented by controlling the performance of a process (preventing any mistake from becoming an defect), e.g., using techniques such as mistakeproofing aka. poka yoke).

Reference: Shingo, Shigeo (1986). Zero Quality Control: Source Inspection and the Poka-Yoke System. Taylor & Francis.

zone [TTP]

In takt time planning, a delimited space where one production unit gets scheduled to complete their work within the takt time.