‘CTQ’, which stands for ‘Critical To Quality’, is the most important factor that affects the quality of products on each line, for example: length, weight, resistance value etc. There are three words which you may not know well: ‘CTQ’, ‘Specification Interval’ and ‘6 Sigmas’. The calculation for the Process Capability Index is “Your process’s CTQ Specification Interval divided by 6 Sigmas”. Let me ask you something, how can you rate superiority and inferiority among several manufacturing lines in a factory? We call this production capability “Process Capability”, and use a Process Capability Index as its quantification. Even if you’re in a service operation, you should learn these basic concepts. Generally, Cp and Cpk are used in the manufacturing industry. This is a question of unilateral, or one-sided, tolerance, but before talking about that, we need to know the Process Capability Index. By the way, if you have a video request or any questions, please write them in the comment section below.īefore Unilateral Tolerance, the Basics of Process Capability Index “Need to understand statistical method for unilateral tolerance.” Recently, I received a question from Paul, one of my viewers. Hi, this is Mike Negami, Lean Sigma Black Belt. Today, we’ll discuss the basics of Process Capability, Cp, Cpk and Unilateral (one-sided) Tolerance.
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