Statistical Process Control involves using statistical methods to monitor processes. Statistical Process Control may be applied to production processes or business/transactional processes.
All processes are subject to variation. Statistical Process Control uses statistical methods to:
 ensure that the process is stable. This often involves confirming that the process output characteristics conform to a normal distribution with parameters that are constant over time.
 using statistical methods to monitor the processes for timely identification of 'special causes' that indicate a change in the statistical parameters
The main tools of SPC include control charts and Process Capability Studies.
