Technical terms of quality management: Z


z value

See Sigma value – mathematical definition of the sigma value.


Zero defects concept

See Zero defects program.


Zero defects principle

See Zero defects program.


Zero defects program

The zero defects program (zero defects concept) aims at guaranteeing defect-free production without rejects and rework. Philip B. Crosby developed the program. His fundamental idea was that even a low error rate is not acceptable and reworking should not exist. Instead, the goal should be production with zero defects.



Zentralstelle der Länder für Gesundheitsschutz bei Arzneimitteln und Medizinprodukten, Bonn. Notifying authority for medical devices. www.zlg.de



Zentralstelle der Länder für Sicherheitstechnik, Munich. Notifying authority for safety technology pursuant to GPSG [German Equipment and Product Safety Act]. www.zls-muenchen.de



Error band. The interval in which the samples taken from the population and their results are only randomly dispersed.

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