Explain the three categories of quality costs

What will be an ideal response?

The PAF paradigm 9 translates quality costs into three broad categories, which are then subdivided into other categories. The three categories are prevention, appraisal, and failure costs (hence the acronym PAF).
Prevention costs are those costs associated with preventing defects and imperfections from occurring. Prevention costs are the most subjective of the three categories of costs. Prevention costs include costs such as training, quality planning, process engineering, and other costs associated with assuring quality beforehand.
Appraisal costs are associated with the direct costs of measuring quality. These can include a variety of activities such as lab testing, inspection, test equipment and materials, losses because of destructive tests, and costs associated with assessments for ISO 9000:2015 or other awards.
Failure costs are roughly categorized into two areas of costs: internal failure costs and external failure costs. Internal failure costs are those associated with online failure, whereas external failure costs are associated with product failure after the production process.