I85PREP
⌘ K
CSQP study materials
CSQP study resources

CSQP: Supplier Development and Improvement

CSQP · Work through your exam, one topic at a time.

All guide sections

Supplier Development and Improvement

What this domain tests

Supplier Development and Improvement covers structured efforts to raise a supplier's capability, not just punish poor performance. CSQP questions test development triggers, supplier segmentation, corrective and preventive action (CAPA), 8D, root-cause analysis, kaizen and lean methods, project charters, and verification of effectiveness. The exam distinguishes reactive correction from proactive capability building and asks you to prove results with data.

Core rules and concepts

  • Segment suppliers before investing. Strategic and bottleneck suppliers justify development; non-critical suppliers may be better served by transactional controls or resourcing.
  • Development triggers include a persistent performance gap, new-product launch, cost-reduction targets, risk exposure, and strategic dependency.
  • A development project needs a charter: baseline, target, scope, team, owner, timeline, resources, and success metric.
  • CAPA discipline: contain the problem, find root cause with 5 Whys or a fishbone, implement corrective action, verify implementation, then verify effectiveness over time.
  • 8D adds team formation, problem description, interim containment, and prevention. Do not close a SCAR when the correction is merely sorting or retraining without system change.
  • Common methods include SPC, MSA, mistake-proofing, process mapping, value stream mapping, setup reduction, and quality-system gap closure.
  • Resourcing is a last resort when capability or willingness cannot be improved within the business need.

Worked example

A supplier runs at 2,500 PPM and 85% OTD. Pareto analysis shows one machining step causes most rejects. The 8D team contains by 100% sorting, finds the root cause as fixture wear outside the preventive-maintenance schedule, replaces the fixture, and adds a daily wear check. After 30 days, PPM is 400 and OTD is 96%; after three months, both hold. Reasoning: containment protects the customer first, root cause addresses the system, and effectiveness is verified with sustained data. Training hours or audit counts are activity measures, not outcomes.

Traps that cost marks

  • Treating the SCAR as paperwork and closing on correction alone.
  • Accepting a plausible root cause without evidence.
  • Skipping containment while investigating.
  • Measuring activity, such as number of workshops, instead of performance.
  • Improving PPM while delivery or cost collapses.
  • Launching development without a baseline or supplier ownership.