Process capability
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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 specification (OOS). Two parts of process capability are: # Measure the variability of the output of a process, and # Compare that variability with a proposed specification or product tolerance
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 specification (OOS). Two parts of process capability are: Measure the variability of the output of a process, and Compare that variability with a proposed specification or product tolerance ==Capability study== The output of a process is expected to meet customer requirements, specifications, or engineering tolerances. Engineers can conduct a process capability study to determine the extent to which the process can meet these expectations. The ability of a process to meet specifications can be expressed as a single number using a process capability index or it can be assessed using control charts. Either case requires running the process to obtain enough measurable output so that engineering is confident that the process is stable and so that the process mean and variability can be reliably estimated. Statistical process control defines techniques to properly differentiate between stable processes, processes that are drifting (experiencing a long-term change in the mean of the output), and processes that are growing more variable. Process capability indices are only meaningful for processes that are stable (in a state of statistical control). ==References== Pyzdek, T, "Quality Engineering Handbook", 2003, Bothe, D. R., "Measuring Process Capability", 2001, Godfrey, A. B., "Juran's Quality Handbook", 1999, ASTM E2281 Standard Practice for Process and Measurement Capability Indices
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