<P> Common and special causes are the two distinct origins of variation in a process , as defined in the statistical thinking and methods of Walter A. Shewhart and W. Edwards Deming . Briefly , `` common causes '' , also called natural patterns , are the usual , historical , quantifiable variation in a system , while `` special causes '' are unusual , not previously observed , non-quantifiable variation . </P>
<P> Common and special causes are the two distinct origins of variation in a process , as defined in the statistical thinking and methods of Walter A. Shewhart and W. Edwards Deming . Briefly , `` common causes '' , also called natural patterns , are the usual , historical , quantifiable variation in a system , while `` special causes '' are unusual , not previously observed , non-quantifiable variation . </P>
who is credited for creating a distinction between common and special cases of variation
who is credited for creating a distinction between common and special cases of variation
Walter A. Shewhart W. Edwards Deming
Walter A. Shewhart W. Edwards Deming