Definitions for "Tampering"
Over-responding to individual common cause data points as if they signified special causes--asking for explanations or making changes based on the individual data point. Tampering can increase the variation in a process by 41 percent.
Action taken to compensate for variation within the control limits of a stable system. Tampering increases rather than decreases variation, as evidenced in the funnel experiment.
Adjusting a stable process in an attempt to improve the next result by compensating for or taking into account the deviation from the target of the previous result. Tampering, or over-adjustment of a stable process, actually increases the variation of the results.
the act of altering something secretly or improperly
Adjusting, negating, or removing pollution control equipment on a motor vehicle.
Removal, disconnection, or mal-adjustment of any aspect of a vehicle's emissions control system is referred to as tampering.