Qualified supplier list (QSL)
A qualified supplier list identifies suppliers that have completed a formal qualification process demonstrating their capability to produce specific parts or provide specific services meeting all technical, quality, and regulatory requirements. QSLs typically impose stricter standards than general approved vendor lists and are often required for critical components or regulated industries.
Examples
Medical device QSL: A medical device manufacturer maintains a qualified supplier list for components used in implantable products. Suppliers on this QSL have completed facility audits, demonstrated process capability, provided first article documentation, and been validated through design history file requirements.
Aerospace QSL: An aircraft manufacturer's QSL for flight-critical parts requires suppliers to hold AS9100 certification, pass nadcap special process accreditations where applicable, demonstrate statistical process control, and maintain traceability systems meeting aerospace requirements.
Automotive QSL: A tier-one automotive supplier maintains QSLs by commodity, with qualified sources for specific part numbers based on PPAP submissions, process capability studies, and ongoing performance against quality and delivery metrics.
Definition
QSLs differ from AVLs in their specificity and rigor. While an AVL confirms a supplier can do business with your organization generally, a QSL confirms capability for specific parts, processes, or categories. A supplier might be on the AVL but not qualified for particular components requiring additional validation.
Qualification for the QSL typically involves documentation review, capability assessment, first article inspection, and often on-site audits. The qualification scope defines exactly what the supplier is approved to provide, potentially including specific part numbers, processes, materials, or manufacturing locations.
In regulated industries, QSL management is often a compliance requirement. Quality systems must demonstrate controlled processes for qualifying suppliers and maintaining qualification status. Customers and auditors may review QSL documentation as part of quality assessments.
QSL maintenance requires tracking qualification expiration dates, monitoring supplier performance against qualification criteria, and requalifying suppliers periodically or when significant changes occur. Removing a supplier from the QSL when standards aren't maintained protects quality even when it creates short-term sourcing challenges.
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