Statistical Process Control (SPC) is a process improvement methodology to monitor, control, and continuously optimize a process. SPC is really a subset of Six Sigma. SPC is usually associated with control charts and Design of Experiments.

Use: SPC separates common-cause from assignable-cause variation. The team identifies and removes assignable-cause variation and reduces common-cause variation around three targets – – nominal-is-best, larger-is-better, or smaller-is-better characteristics.

Six Sigma Terminology