Common Cause Variation can be characterized as:

Common Cause Variation is an inherent part of processes that are stable and predictable over time. This type of variation is due to the natural fluctuations that occur in any process, which stem from a range of factors—including materials, methods, and environmental conditions. Because these factors are consistent and repetitive, the behavior of the process can be forecasted, allowing for predictable outcomes.

More specifically, while specific values may differ, the variation remains within a set range or control limits, making it manageable and calculable. This predictability is crucial for quality control as it helps teams to understand what is normal for a process and what may signify a need for process improvement.

In contrast, variations that are uncontrollable tend to reflect on special cause variations, which arise from unique or infrequent events. Unlike common cause variation, special cause variations are less predictable and are seen as abnormalities that might require immediate investigation. Thus, the definition of common cause variation as consistent and predictable highlights its significance in the context of process management and quality assurance.