Total Quality Management  March 14, 2009Posted by desrinda in TQM.
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)
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)