Some interesting observations below on management throwing a schedule off-course.
http://www.agilemanagement.net/Articles/Weblog/Tampering.html
I've been doing a lot of reading about Control Charts and Statistical Process Control recently - of which more to come later this year. One aspect of managing using control charts which was first articulated by Walter Shewhart, the father of the method, is a phenomenum known as "tampering". Tampering is management by reaction without recognition to the natural variance which occurs in a process. Tampering is amplification of common cause variance to the point where an otherwise controlled system can become chaotic.
It is a fault of inexperienced and untrained managers to react to common cause variance - often in a heavy handed fashion. Their actions, regardless of what, result in tampering with the system and consequent amplification of variance turning it into an assigned cause problem. It so happens that the assigned cause is the management intervention.
This paper by Gemba Research advises Lean practitioners to beware of tampering because they might just make things worse rather than better.
Deming (originally Deming’s teacher Shewhart) said "tampering" is the changing of a process in reaction to just one instance of its output. Tampering is depending on intuition and common sense. Deming demonstrated through many examples that this can often make things worse, not better.
9:03:09 AM
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