"Process capability" compares "process variability" to the "design specifications".

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Process capability is a measure of how well a process can consistently produce outputs that meet design specifications. It compares the process variability (i.e. the range of values the process produces) to the design specifications (i.e. the range of values that are acceptable for the output). A high process capability means that the process is able to consistently produce outputs that meet the design specifications, while a low process capability means that the process is producing many outputs outside the acceptable range.

"Process Capability" Compares "Process Variability" to the "Design Specifications