Technical terms of quality management: 1 – 9


100% inspection

Full quality inspection of all units in an inspection lot. (On the basis of DIN 55350-17)


2-sample t-test

Statistics tool used in hypothesis testing in order to check the mean value of two populations using sampling.
Example: Your company cannot always meet a certain specified delivery time and an examination is to be conducted to see which influencing factors are responsible for the dispersion.


3 Mu

See Muda, Mura, Muri.



See Gemba, Gembutsu, Gemjitsu.


4W3H questions

Questioning technique for problem analysis. Who? What? When? Why? How? How much or how many? How good?



Sort, straighten (or set in order), shine (or sanitize), standardize and sustain. See Seiri, Seiton, Seiso, Seiketsu, Shitsuke. The five Ss stand for order and cleanliness at the workplace (concept that originated in Japan). They also describe a procedure that can help to establish a new system for the upkeep of production means in five steps.


5W technique

Problem-solving technique. The question “why“ is asked five times in a row in order to find the actual cause of the problem.


7 creativity tools

See Creativity techniques.


7 management tools

See Management tools.


7 quality management principles

You can find out more about this in the Quality management principles.


7 quality tools

See Quality tools.


8D report

Document within the framework of complaint management. It was standardized by VDA and is primarily used in the automotive (supplier) industry. In addition to the type of complaint, the 8D report also contains the responsibilities and corrective actions. The 8D approach to problem-solving forces a systematic procedure and strict documentation of the solution steps. This enables the root causes of problems to be recognized and remedied. The process contains the following eight disciplines (8D) or steps: Form a team to solve the problem; Describe the problem; Determine interim containment actions; Determine the root causes; Plan corrective actions; Implement the actions; Prevent recurrence of problems; Show appreciation for the team‘s performance.

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