What does an out-of-control process typically require?

An out-of-control process typically requires a detailed investigation for assignable variation because it indicates that the process is exhibiting inconsistencies that cannot be attributed to common causes. When a process is deemed out of control, it is essential to identify specific factors or variations that are causing the deviation from expected performance. This thorough investigation helps in pinpointing the root causes of the issues, which may include equipment malfunctions, operator errors, or changes in materials, rather than the usual fluctuations inherent in the process.

Addressing these assignable variations is crucial for the long-term stability and efficiency of the process. Once identified, corrective actions can be implemented to restore the process to its desired state. This focus on investigating and correcting unique variations helps ensure that the process can operate within defined control limits, ultimately leading to improved quality and productivity.