Common Cause Variation vs. Special Cause Variation: Key Differences
It is quite essential to
understand variation pertaining to process involvement and quality management,
for achieving organizational success. Variations are of two types: Common Cause
variation and Special Cause Variation.
Both types play a significant role that helps determine the stability and
performance of processes.
In this
blog, we will explain the key differences between the two types of variation
with the help of real-world examples for a better understanding.
Common Cause
Variation:
Special
Cause Variation
Special cause variation is caused
by an external factor. It is not innate in the process and leads to outcomes
that are unpredictable and uncommon. Special cause variation can lead to
striking deviations as opposed to expected and stable outcomes.
Examples:
●
Machine
breakdowns leading to production delays.
●
Employee
errors resulting in quality defects.
●
Supplier
issues causing disruptions in the supply chain.
Key
Differences
Nature
●
It is innate
and a natural part of any process and its operation with natural fluctuations
●
Special cause
variation is caused by an external factor. It is not innate in the process.
Predictability:
●
Common cause
variation is predictable and stable, operating within certain statistical
limits.
●
Special cause
variation is unpredictable and can result in significant deviations from the
expected performance of the process.
Management
Approach:
●
Common cause
variation requires process improvements and adjustments to reduce variability
and enhance stability over time.
●
Special cause
variation requires immediate investigation and corrective action to address the
root cause and prevent recurrence.
Conclusion:
In summary, there are two different types of variation that affect
the stability and performance of processes. Special cause variation arises from
outside influences that have unanticipated effects, whereas the other variation
reflects intrinsic natural oscillations in the process. Organizations can
optimize process performance, improve quality, and promote continuous
improvement by utilizing suitable management practices and comprehending the
fundamental distinctions between various types of variation.
Are you looking for an opportunity to learn more about quality
management? MindCypress offers Lean
Six Sigma Green Belt certification training and Lean Six Sigma
Black Belt certification through live online training. The online training
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