In a Control Chart, if a data point goes beyond the upper and lower control limits, the process is called?

When a data point goes beyond the upper or lower control limits in a Control Chart, the process is typically referred to as "Out of Control." This situation signals that the process may be unstable or that there are special causes affecting the process which require investigation.

Control charts are essential tools in quality control and process monitoring. They help to determine if a process is in a state of statistical control, which means that only random variations are present. By establishing upper and lower control limits based on the data's inherent variability, any data point falling outside these limits indicates that something unusual has occurred. This could be due to external factors, changes in the process, or errors in measurement.

A thorough analysis is often required to identify the root cause of such deviations, and corrective actions may be necessary to bring the process back into a state of control. The identification of these points can help in maintaining quality standards and improving overall process performance.