Sorting Cost
Meaning ~ Expense of manually isolating non-conforming items from a suspect shipment to secure a clean point for the production line without halts.
External Failure Cost
Meaning
Quality cost categories measure the financial penalties incurred when a defective product is delivered to a customer. A manufacturing organization tracks the external failure cost to evaluate the total financial damage of shipped defects, including warranty claims, product recalls, and customer returns. This metric governs the post-delivery phase of the product life cycle, where defects have escaped all internal screens.
It excludes costs incurred during the manufacturing process, such as internal scrap and rework.
Economic Impact
Corporate balance sheets suffer the most severe damage from defects that reach the end user. The external failure cost includes not only the replacement of the physical product but also the labor for field service and potential legal liabilities. These expenses are often many times higher than the cost of fixing the defect during production.
Detection Timing
Product inspection timing determines whether a failure is classified as internal or external. Once the shipment is accepted by the buyer, any subsequent defect discovery triggers an external failure cost for the supplier. This timing distinction is critical for allocating liability under the purchase agreement.
Operational Prevention
Quality engineering departments use these cost metrics to justify investments in advanced testing equipment and supplier audits. Showing the high cost of field failures helps secure budgets for preventive quality measures. This focus shifts the organization from reactive sorting to proactive process control.