What does a stable process indicate when using control charts?

A stable process, as indicated by control charts, signifies that the process is operating consistently and predictably over time. This means that the variations observed in the process are due to common causes rather than special causes. In a stable process, the statistical control limits established on the chart provide a clear view of the expected performance, allowing for accurate forecasting and control of the process.

When a process is stable, stakeholders can have confidence in its performance, facilitating more informed decision-making. It implies that the process outputs will typically fall within the control limits set by the chart, making it easier to maintain quality and efficiency. Conversely, if a process exhibits high variability, low customer satisfaction, or requires frequent adjustments, it suggests instability and variability that could lead to inconsistent results and higher potential for defects or dissatisfaction.