https://doi.org/10.1351/goldbook.08099
Process subject only to random causes.
Notes:
- The random variation is considered to follow a Gaussian distribution and is characterized by its variance (standard deviation)
- This state does not imply that the random variation is large or small, within or outside of specification, but rather that the variation is predictable using statistical techniques.
- A control chart can be used to monitor a process and to determine whether the process is, or is not, in a state of statistical control. See out-of-control criteria and control limit.