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.
Frequently asked questions
What is a qualified supplier list?
A qualified supplier list (QSL) identifies suppliers that have completed a formal qualification process demonstrating 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.
What is the difference between a QSL and an AVL?
An approved vendor list confirms a supplier can do business with your organization generally, while a qualified supplier list confirms capability for specific parts, processes, or categories. A supplier can be on the AVL and still not be qualified for particular components that require additional validation.
How does a supplier get onto a QSL?
Qualification for a 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 down to specific part numbers, processes, materials, or manufacturing locations. In aerospace, a QSL for flight-critical parts can require AS9100 certification, Nadcap special process accreditations, statistical process control, and aerospace-grade traceability.
How is a QSL maintained over time?
QSL maintenance means tracking qualification expiration dates, monitoring supplier performance against qualification criteria, and requalifying suppliers periodically or when significant changes occur. Removing a supplier that stops meeting standards protects quality even when it creates short-term sourcing challenges.
Why do regulated industries require QSLs?
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 during quality assessments. In automotive, qualification evidence such as PPAP submissions and process capability studies backs approval for specific part numbers; in medical devices, facility audits and design history file requirements support the listing.
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