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The process capability is a measurable property of a process to the specification, expressed as a process capability index (e.g., C pk or C pm) or as a process performance index (e.g., P pk or P pm). The output of this measurement is often illustrated by a histogram and calculations that predict how many parts will be produced out of ...
The process capability index, or process capability ratio, is a statistical measure of process capability: the ability of an engineering process to produce an output within specification limits. [1] The concept of process capability only holds meaning for processes that are in a state of statistical control. This means it cannot account for ...
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Consider a quality characteristic with a target of 100.00 μm and upper and lower specification limits of 106.00 μm and 94.00 μm, respectively. If, after carefully monitoring the process for a while, it appears that the process is out of control and producing output unpredictably (as depicted in the run chart below), one can't meaningfully estimate its mean and standard deviation.
The current (as of 2023) valid edition is Automotive SPICE 4.0, published by VDA and QMC in December 2023. The following translations are available: English, Japanese, Korean, and Chinese.[7] This latest version replaces the Automotive SPICE 3.1. The model is continuously being developed or improved by the working groups above.[9]
Each of these documents supports a major design approval decision each with gradual improving design maturity A, B or C. The sponsor is the single focal point for all three documents. The Initial Capabilities Document (ICD) defines the capability need and where it fits in broader concepts, ultimately supporting the milestone A decision.