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Process
Performance
Process Performance attempts
to answer the question: does this sample from the process meet customer
requirements? It differs from Process Capability in that Process Performance
only applies to a specific batch of material. Samples from the batch may
need to be quite large to be representative of the variation in the batch.
Process Performance is
only used when process control cannot be evaluated. An example of this is
for a short pre-production run.
Process Performance generally
uses sample sigma in its calculation;
Process capability uses the process sigma value determined from either the
Moving Range ,
Range , or Sigma
control charts.
The calculated Process
Performance and Process Capability indices will likely be quite similar
when the process is in statistical control.
See also:
Pp
Ppk
Ppm
Pr
Interpreting
Process Capability
When
to Use Process Capability
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