Cost of Nonconformance

Cost of nonconformance represents the price paid for poor quality. It is divided into internal failure costs and external failure costs. Internal failures are defects found before the deliverable reaches the customer, such as rework, scrap, retesting, and downtime. External failures are defects found after delivery, such as warranty repairs, liability costs, complaint handling, and lost business.\n\nExternal failure costs are generally the most expensive and damaging category of quality costs. When a defect reaches the customer, the cost includes not only the direct repair but also damage to the organization's reputation, potential legal liability, and loss of future business. This is why catching defects early through prevention and inspection is so important.\n\nThe cost of nonconformance is often called the "cost of poor quality" or the "cost of doing it wrong." Projects with inadequate quality planning and management tend to have high nonconformance costs, which manifest as schedule delays, budget overruns, and unhappy stakeholders. The goal is to minimize nonconformance costs by investing appropriately in conformance activities.