Supplier quality management: the complete process

The supplier life cycle

Supplier quality is not incoming inspection. It is a cycle that starts before a supplier is nominated and continues as long as parts are delivered. Each step has a clear output.

• Selection: self-assessment and potential analysis on site, decision on approval and risk class.
• Contract: supplier quality agreement with PPM targets, cost recovery, change notification and escalation rules.
• Development and launch: APQP with the supplier, PPAP or PPF approval before series delivery.
• Series: incoming inspection by risk, monthly scorecard, complaints with 8D.
• Escalation and development: improvement plans, controlled shipping, audits, and in the end phase-out if nothing helps.

What to put in the supplier quality agreement

• Applicable standards (IATF 16949, customer-specific requirements) and the PPAP level.
• Quality targets: PPM, on-time delivery, 8D response times (for example containment 24 h, root cause 10 days, closure 60 days).
• Change management: no change without written approval (PCN / PTN).
• Cost recovery: which costs are charged and the administration fee per complaint.
• Escalation levels and exit criteria.
• Traceability, record retention and the right to audit.

Incoming inspection: by risk, not by habit

Checking everything is expensive and still lets defects through. Decide per part and supplier: new parts and class C suppliers get full checks or skip-lot inspection is suspended; stable class A suppliers can deliver ship-to-stock with periodic requalification. Use the AQL tables only where attribute sampling makes sense and remember that IATF 16949 expects zero defects as the acceptance level for attribute sampling.

Measuring performance

A monthly scorecard with a few hard numbers (PPM, on-time delivery, complaints, responsiveness) and an A / B / C class gives an objective basis for reviews, sourcing decisions and escalation. Share it with the supplier every month; surprises at the annual review do not improve anything.