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Total Quality Management [6] March 14, 2009

Posted by desrinda in TQM.
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PROCESS CAPABILITY

The natural variation of a process should be small enough to produce products that meet the standards required, but a process in statistical control does not necessarily meet the design specifications. Therefore, we measure PROCESS CAPABILITY, a measure of the relationship between the natural variation of the process and the design specifications.

Process Capability Ratio (Cp) and Process Capability Index (Cpk)

cp-cpk

cpk-interpretation

Terms in sampling inspection:
– Acceptable quality level (AQL), related to risk of reject good lot (manufacturer’s risk)
– Lot tolerance percent defective (LTPD), related to risk of accept bad lot (customer’s risk)

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