A product that meets or exceeds its design specifications and is free of defects that mar its appearance or degrade its performance is said to have high quality of conformance. Note that if an economy car is free of defects, it can have a quality of conformance that is just as high as defect-free luxury car. The purchasers of economy cars cannot expect their cars to be as opulently as luxury cars, but they can and do expect to be free of defects.
Preventing, detecting and dealing with defects cause costs that are called quality costs or costs of quality. The use of the term "quality cost" is confusing to some people. It does not refer to costs such as using a higher grade leather to make a wallet or using 14K gold instead of gold plating in jewelry. Instead the term quality cost refers to all of the costs that are incurred to prevent defects or that result from defects in products.
Quality costs can be broken down into four broad groups. These four groups are also termed as four (4) types of quality costs. Two of these groups are known as prevention costs and appraisal costs. These are incurred in an effort to keep defective products from falling into the hands of customers. The other two groups of costs are known as internal failure costs and external failure costs. Internal and external failure costs are incurred because defects are produced despite efforts to prevent them therefore these costs are also known as costs of poor quality.
The quality costs do not just relate to just manufacturing; rather, they relate to all the activities in a company from initial research and development (R & D) through customer service. Total quality cost can be quite high unless management gives this area special attention.
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