Definitions (2)
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1. Law: Illegal or improper alteration of, or interference with, a document or evidence; or meddling or negotiating with a witness to influence his or her testimony.
2. Quality control: Continually adjusting a process to compensate for variations in its output. If the variations are within the control limits of a stable system (and all stable systems have variations) then tampering invariably makes things worse. Only a change in the system itself (and not any ad hoc adjustment) can reduce variation and improve quality. Urge to temper (trying to do 'one's best,' but actually messing around) springs from the naïve desire to do something anything to improve results without sufficiently understanding the system, and ruins an otherwise working process.
Tampering and its effects are demonstrated with the help of funnel experiment. Not to be confused with tempering.

Use 'tampering' in a Sentence

You should make sure that you are never accused of any tampering or your reputation may be ruined beyond repair.
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If he was tampering with evidence, then that was a crime and he could go to prison for a long time.
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The defendant was suspected of tampering with a key witness in his own trial in an effort to sabotage the integrity of the prosecutions case.
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