Tampering (quality control)

Tampering in the context of a controlled process is adjusting the process on the basis of outcomes which are within the expected range of variability. The net result is to re-align the process so that an increased proportion of the output is out of specification. The term was introduced in this context by W. Edwards Deming, and he was a strong proponent of using control charts to avoid tampering.

## See also

* Incentive program
* Control chart

## References

* W. Edwards Deming (1994) The New Economics for Industry, Government, Education, 2nd edition, Massachusetts Inst Technology. ISBN 0-911379-07-X (Chapter 9.)
* Deming, W. Edward (1986), Out of the Crisis, MIT Center for Advanced Engineering Study, 327–32. (2000 edition: ISBN 0-262-54115-7)
* Gitlow, Howard; Gitlow, Shelly; Oppenheim, Alan; Oppenheim, Rosa (1989), Tools and Methods for The Improvement of Quality, CRC Press ISBN 0-256-05680-3
* Krehbiel, T. C. (1994), "Tampering with a Stable Process". Teaching Statistics, 16, 75–79. doi: 10.1111/j.1467-9639.1994.tb00696.x

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