Statistical Process Control : A summary
Statistical Process Control, commonly referred to as SPC, is a method for monitoring, controlling and, ideally, improving a process through statistical analysis.
The philosophy assumes that all processes exhibit intrinsic variation. However, sometimes processes show excessive variation that produces undesirable or unpredictable results.
- SPC uses graphical displays known as control charts to monitor a production process.
- Control charts provide a basis for deciding whether the variation in the output is due to common causes (in control) or assignable causes (out of control).
- Values outside of the control limits provide strong evidence that the process is out of control.