Quality Control
Meaning ~ Acceptance verification through systematic sampling against tolerances ensures that a production lot complies with contractual standards before risk transfers.
Defect Severity
Meaning
Quality risk categorizations divide non-conformances into defined impact tiers to establish clear acceptance boundaries during factory inspection. In physical pre-shipment audits, defect severity partitions non-conforming units into major or minor categories according to the operational risk or economic loss caused by the failure. Critical non-conformances involve safety hazards or regulatory breaches that halt shipment entirely.
Major issues impair function or appearance enough to cause product return, while minor flaws represent small aesthetic deviations that do not affect utility.
Threshold Matrix
Acceptance sampling standards such as ISO 2859-1 assign distinct allowable quality limits to each level of non-conformance. Factory quality control plans map specific physical deviations directly onto these limits before production begins. For instance, an exposed electrical wire triggers immediate lot rejection under a zero-tolerance threshold for critical faults.
Dimensional variations outside drawing tolerances typically fall into the major category, carrying an allowable limit of one point five percent. Surface scratches sit in the minor tier with a higher threshold, allowing minor process variations without invalidating the shipment.
Contractual Consequence
Failure to agree on these exact categorizations prior to purchase order placement leads to payment withholding and costly port delays. When a buyer records a flaw as major but the supplier logs it as minor, the dispute blocks lot release until a third-party laboratory re-evaluates the shipment. Rejection based on improper categorization forces unnecessary factory re-work or unexpected discounts.
Supplier agreements must link each classification level to financial remedies, including vendor debit notes or mandatory sorting at supplier expense.
Inspection Action
Inspectors tally individual physical defects during final random sampling to calculate total non-conforming units against contractual thresholds. Evaluating defect severity requires objective measuring instruments rather than subjective inspector opinions. If the count of major non-conformances exceeds the agreed threshold by a single unit, the entire batch fails inspection.