Common Cause
"Variation that exists within the natural variation of the process, based on recurring sources or factors that consistently acts on the process. These types of causes produce a stable and repeatable distribution over time” (Reference: Lean Six Sigma, n.d.). If only common cause variation is occurring, then a system is considered stable and predictable. Reducing common cause variation (stable system) will require fundamental process changes. Special causes of variation are those causes that are not normally present in the system.
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Special Cause
"Also known as assignable variation. They are often intermittent and unpredictable, and due to a specific problem or issue that has arisen. It can be identified by looking for out of control conditions as defined by the Nelson Rules” (Lean Six Sigma, n.d. ). Special causes of variation can be identified and addressed to eliminate the variation without having to fundamentally change the system (for example, a Root Cause Analysis is an approach to better understand special causes of variation). When the special cause variation has a positive effect, activities to incorporate the special cause so that they become part of the process rather than unpredictable causes. Distinguishing the type of variation present in a process is critical for improvement, because each type of variation requires a different type of action. Failure to distinguish the type of variation can lead to two types of errors:
What is variation?
What is Nelson Rules?
96330 3.4.3
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Created on July 23, 2021
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Transcript
Common Cause
"Variation that exists within the natural variation of the process, based on recurring sources or factors that consistently acts on the process. These types of causes produce a stable and repeatable distribution over time” (Reference: Lean Six Sigma, n.d.). If only common cause variation is occurring, then a system is considered stable and predictable. Reducing common cause variation (stable system) will require fundamental process changes. Special causes of variation are those causes that are not normally present in the system.
Listen
Listen
Special Cause
"Also known as assignable variation. They are often intermittent and unpredictable, and due to a specific problem or issue that has arisen. It can be identified by looking for out of control conditions as defined by the Nelson Rules” (Lean Six Sigma, n.d. ). Special causes of variation can be identified and addressed to eliminate the variation without having to fundamentally change the system (for example, a Root Cause Analysis is an approach to better understand special causes of variation). When the special cause variation has a positive effect, activities to incorporate the special cause so that they become part of the process rather than unpredictable causes. Distinguishing the type of variation present in a process is critical for improvement, because each type of variation requires a different type of action. Failure to distinguish the type of variation can lead to two types of errors:
What is variation?
What is Nelson Rules?