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Special Cause Variation

Special Cause Variation refers to variation in a process that is sporadic and non-random. All processes contain Common Cause Variation, but processes that exhibit Special Cause Variation do not perform in a predictable manner and are technically not in Control.

Once Special Cause Variation has been identified it should be addressed specifically and fixed or planned for. Unlike Common Cause Variation, this is generally possible without significant modifications to a system.


For a better understanding of Special Causes, check out our Green Belt Training or Black Belt Training.

Mochi is the AI Master Black Belt at GLSS. He helps everyone understand Lean Six Sigma in our online courses and provides real-time guidance on how to use Lean Six Sigma tools via live chat. He's supported by our team of Master Black Belts who have 40+ experience.
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