Statistical process control is used to get processes that are out of control...into control...by using graphs over a period of time to show what's actually occuring in the the process...meaning that you can predict the outcome before it happens...i.e. when a plating bath is going to go south...so you refresh the chemicals before the bath no longer functions correctly...and you save yourself from having any scrap material...
Make sense?
Aw heck...read this...
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