Nonconformance Cost

Nonconformance cost commonly refers to the cost incurred when a product, component, process output, or service does not meet specified requirements. It is a subset of the broader Cost of Poor Quality (COPQ) and focuses on the direct and indirect costs triggered by nonconformances identified internally or by customers.

What nonconformance cost includes

In industrial and regulated manufacturing environments, nonconformance cost typically includes:

• Scrap: Material and labor costs for units that must be discarded and cannot be recovered.
• Rework and repair: Additional labor, materials, tooling, and machine time required to bring a nonconforming item into compliance.
• Re-inspection and re-testing: Extra inspection, testing, and verification required after rework or repair.
• Containment activities: Sorting, quarantining, and segregating potentially affected lots or serial numbers.
• MRB and engineering evaluation time: Time spent by Material Review Board (MRB), quality, and engineering to review, disposition, and document nonconformances.
• Supplier-related nonconformance handling: Time and cost to process supplier NCRs, returns, and corrective actions.
• Customer-facing nonconformance response: Resources spent responding to customer complaints, concessions, deviations, field returns, or warranty claims related to nonconforming product.

These costs are usually tracked through quality systems (NCR, CAPA), MES, ERP, or separate COPQ reporting, and can be categorized as internal (found before shipment) or external (found after shipment).

What nonconformance cost does not include

Nonconformance cost is different from:

• Prevention costs: Investments in training, process controls, mistake-proofing, and maintenance designed to avoid nonconformances.
• Appraisal costs: Routine inspections, testing, and audits done on conforming product as part of normal quality assurance.
• Broader business impacts: Long-term brand damage, lost sales, or strategic impacts, which may be considered in total quality cost but are usually harder to quantify directly per nonconformance.

Operational use in manufacturing

In practice, nonconformance cost is often captured at the point where an NCR is opened, a scrap or rework transaction is recorded, or a concession is issued. Typical data elements include:

• Labor hours spent on rework, evaluation, and disposition
• Material and component costs written off as scrap
• Machine or test stand time used for rework and re-testing
• Logistics and handling costs for returns or line stoppages

This information is used to prioritize corrective and preventive actions (CAPA), justify process improvements, and monitor trends such as cost per NCR, cost per unit, or cost per supplier.

Common confusion

• Nonconformance cost vs. COPQ: COPQ usually includes prevention, appraisal, internal failure, and external failure costs. Nonconformance cost typically focuses on internal and external failure costs tied directly to specific nonconformances.
• Nonconformance cost vs. scrap cost: Scrap cost is one component of nonconformance cost. Nonconformance cost also includes rework, MRB evaluation, re-inspection, and related overheads.