To meet quality requirements, projects must incur some primary planning costs. These costs can be divided into four main categories—prevention costs, appraisal costs, failure costs, and intangible costs.
Creating quality products and services requires an understanding of all of these costs. When project managers understand quality costs, it's easier for them to make decisions about such things as investing in a process, designing revisions, or changing procedures. The total quality cost of a project is considered to be the sum of the four main categories discussed below.
- Prevention costs. Prevention costs occur from activities that prevent poor quality in products and services. Such costs help ensure the customer's requirements are met.
- Appraisal costs. Appraisal costs are linked with measuring, evaluating, or auditing products and services. This can include material reviews, incoming inspections, work-in-process inspections, and final inspections or testing.
- Internal and external failure costs. Internal failure costs are associated with not meeting customer requirements prior to when the product or service is provided. External failure costs occur when the nonconforming product reaches the customer.
- Intangible costs. Intangible costs of poor quality are hidden costs that involve the company's image. They can be three or four times greater than tangible costs. Missing a deadline or other quality problems can be intangible costs of quality.
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