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Tampering is any action that changes the system arbitrarily and without proper consideration of the implications.
Tampering is a common and useless special cause of variation.
Vandalism, thoughtlessness, ignorance and well meaning intentions on the part of people working in the system are familiar forms of tampering.
Being helpful is quite often the opposite to improvement.
Tampering
adds to the variation by changing the process itself which can be fatal to the
outcomes
True stories of Tampering:
Friday Sport - how a helpful sports teacher denied 400 children their weekly sports session
Tampering with this website - how the author's attempt to improve this website made it very difficult for many visitors to read.