What are prevention, appraisal and failure costs?

We can describe these costs as follows

Prevention cost:
•Quality planning
•Formal technical reviews
•Testing equipment
Appraisal cost:
•In-process and inter-process inspection
•Equipment calibration and maintenance
Failure cost:
Internal failure cost: rework, repair, and failure mode analysis
External failure cost: complaint resolution, product return and replacement, help line support, warranty work

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