Tampering (quality
Tampering (quality control)
Tampering in the context of a controlled process is when adjustments to the process are made based on 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[citation needed] in this context by W. Edwards Deming, and he was a strong proponent of using control charts to avoid tampering.