You can say that cost of quality is the combination of
Prevention Cost + Appraisal Cost + Failure Cost

Cost of quality is a term that is used to quantify the 
total cost of failure,apprisal and prevention cost 
assosiated with production of cost. This cost component is 
called cost of quality.

Cost of production = RTF + Cost of quality

RTF(Right the first time cost) = cost of 
labour,material,tools,

cost of quality = Failure cost,Appraisal cost,prevention 
cost.