Variation in production systems that is caused by factors that can be clearly identified and possibly even managed is called assignable variation.

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Assignable variation refers to the variability in the production process that can be traced back to a specific cause, and thus can be managed by addressing that cause. This is in contrast to common cause variation, which is inherent in the system and cannot be easily attributed to a single source.

Variation in Production Systems That Is Caused by Factors That