Process capability indices can be viewed as convenient and excellent tools to measure and define process output. Several capability indices including Cp, Cpu, Cpl, Cpk, Cpm and Cpp have been widely used in manufacturing industry to provide common quantitative measures on process potentials and performance. Process capability inex Cpp can be used to measure product capability with respect to process targeting. “The larger the better” is the general rule for the application of process capability indices Cp, Cpu, Cpl, Cpk and Cpm. However, those researchers take accounts for processes with single quality characteristics only and cannot be applied to a product family with different models, types or sizes simultaneously. the approach of this paper is to propose a concise and applicable methodology that measures the entire process capability of a product family with several models. For convenient and practical application to product engineers, a simple procedure of hypothesis test for entire process capability of a PVC pipe product familiy is well established.
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