Statistical Process Control (SPC)

			
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				              Statistical Process Control (SPC)

			                Fred Allen
According to many, Six Sigma is based on Statistical Process Control (SPC), a method of visually monitoring production processes. In Six Sigma, each business process must be measured and for this often the SPC methodology is used.  Aims of SPC are: 1. Adjustment: To detect quickly when a process needs readjustment or repair. 2. Improvement: To find the most urgently needed improvement in the system itself.
			            
			                  		PC
														
														Alice
What is the difference between PPK & CPK?
			                  	
			                  		What is the difference between PPK & CPK?"
														
														Lo.Max
PPK is measured by unknowed  process, cpk is measured by stable process
			                  	
			                  			Cpk or Ppk??

															Jacques-Alain TIAKO, Manager, France, Member
Cpk  - It's the capability index for a stable process (the process must be in a state of statistical control). The sigma calculation is based on within subgroup variation.

Ppk - It's the performance index (the actual process PERFORMANCE). The estimate of sigma is based on total variation. Ppk must be calculated if less than 100 samples or when the process is chronically unstable but meeting the specifications and in a predictable pattern.
			                  		
			                  			What is the Difference Between PPK & CPK?

															Ger de Waard, Management Consultant, Netherlands, SIG Leader
			                  		
											Read all responses and join this discussion yourself. 
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