Re: Special Causes Indicators in Red Bead

[WyoCheek@aol.com]

It seems to me:

Any variation in people, environment, equipment, materials, or methods at any 
given moment can create data points outside determined control limits. 
Whether special or common shouldn't these be subject to "by what method" the 
influencing element(s) is being measured? I have an audio where Deming says, 
"Sometimes there will be defects where the cause will never be known". Can we 
call it special or common then? Do you think maybe there needs to be a new 
operational definition--"unknown cause" when using the control chart in the 
RB experiment?

S Cheek DDS