Define what good supplier performance means
Start from real operational expectations: lead time, quantity, quality, documentation, flexibility, responsiveness or continuity of supply. Criteria should reflect the supplier role and the risk associated with the purchasing family.
Avoid one complicated score built from too many indicators. A simple scorecard with a few understandable dimensions supports better discussion and makes improvement priorities visible.
Common performance dimensions
Weight them according to supplier criticality.
- Delivery punctuality.
- Quantity conformity.
- Product or service quality.
- Responsiveness and answer quality.
- Stability of commitments.
Measure punctuality consistently
Define the reference date before calculating service level: requested date, confirmed date or an accepted delivery window. Without a shared rule, two teams can produce different results from the same receipts.
Measure the size of delays as well. Two suppliers may show the same late-delivery percentage while one is typically one day late and the other several weeks. Distribution of delays adds useful context.
Make OTD interpretable
Document the On Time Delivery rule and any exclusions.
- Reference date.
- Accepted tolerance.
- Partial deliveries.
- Customer-driven order changes.
- Analysis period.
Include quality, quantity and communication
An on-time delivery that is incomplete or non-conforming can create as much disruption as a delay. Track quantity gaps, non-conformities, disputes and returns where they are relevant.
Communication quality also matters: quick confirmation, early warning of delay, actionable answers and completion of recovery actions. Transparent suppliers are often easier to manage when an issue occurs.
Keep reviews evidence-based
Store factual examples linked to the score so supplier discussions remain objective.
Segment evaluation according to risk
A strategic or single-source supplier deserves closer monitoring than a standard supplier that is easy to replace. Adjust review frequency, number of indicators and escalation level to operational and financial risk.
Combine performance with dependency: share of volume, replacement lead time, alternative sources, technical complexity and customer impact. An average score can become critical when alternatives are limited.
Create monitoring classes
A simple segmentation helps adapt the level of management.
- Strategic / critical.
- Important.
- Standard.
- Watch list / improvement plan.
Turn evaluation into an improvement plan
Review indicators with the supplier using the underlying facts and focus on a small number of priorities. Define cause, action, owner and follow-up. A scorecard without action quickly becomes an administrative exercise.
Then measure progress. The objective is not punishment but higher flow reliability. Persistent gaps may ultimately lead to alternative sourcing, renegotiation or dependency reduction.
Common mistake to avoid
Changing calculation rules regularly makes trend comparison impossible. Stabilise definitions before comparing periods.
Implementation checklist
Before considering the topic under control, check these points in your procurement process.
- Criteria defined.
- Rules documented.
- Supplier risk segmented.
- Evidence linked to scores.
- Actions followed up.
Continue with related procurement guides
Conclusion
Reliable procurement combines coherent parameters, current information and the ability to prioritise exceptions. Use this method as a working framework: adapt thresholds and indicators to your context, measure results and improve the rules progressively instead of managing only through emergencies.