What are prevention, appraisal and failure costs?

We can describe these costs as follows

Prevention cost:
•Quality planning
•Formal technical reviews
•Testing equipment
•Training
Appraisal cost:
•In-process and inter-process inspection
•Equipment calibration and maintenance
•Testing
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

What is cost of quality?

Cost of Quality includes:

• Includes all costs incurred in the pursuit of quality or perform quality related work.

• It is more than 50% of the total project cost

There are three types of cost
Prevention cost: It is  incurred to prevent defects from occurring.
Appraisal cost: It is  incurred for reviewing and testing the work product.
Failure cost:It is the cost  incurred in correcting the defects found during appraisals or reported by the customer.