![]() Process capability indices can help identify opportunities to improve manufacturing process robustness, which ultimately improves product quality and product supply reliability this was discussed in the November 2016 FDA “Submission of Quality Metrics Data: Guidance for Industry.” 4įor optimal use of process capability concept and tools, it is important to develop a program around them. “Quantitative Techniques to Evaluate Process Stability.” Quality Engineering 18, no. Pp/Ppk What Is the Diff erence? Which One Should I Use?” April 26, 2010. Implementing Six Sigma: Smarter Solutions Using Statistical Methods. Tolerance width divided by the short-term process variability, irrespective of process centering.Ĭapability index which accounts for process centering Process Capability: The 6σ range of a process’s inherent variation (short term) Table A: Process capability indices summary Capability Indices While all serve the same high-level purpose, different indices are better suited to certain situations. ![]() Some are based on long-term variability, others on short-term variability. Some predict future capability while others describe past performance. There are different types of process-capability indices (Table A). Typically, the higher the index, the tighter that process property has remained within its specifications. ![]() Process capability is an index that compares quantitative process variability to its specification limits over a predefined period.
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