Supplier Preferencing

Structured supplier evaluation emerged from Total Quality Management (TQM) and Just-in-Time manufacturing philosophies developed in Japan during the 1950s–1970s. Toyota’s supplier development system — the Toyota Production System (TPS) — required that suppliers be assessed not just on price but on quality capability, delivery consistency, and continuous improvement culture. This multi-dimensional view of supplier performance replaced the prevailing Western practice of price-only bidding.

In the 1980s, the Kraljic Matrix (published by Peter Kraljic in Harvard Business Review, 1983) introduced the concept of differentiating supplier relationships by strategic importance and supply risk. This gave procurement professionals a framework for deciding which suppliers warranted deep relationship investment versus transactional management.

Weighted scoring models became standard in procurement practice through the 1990s as part of formal Request for Proposal (RFP) evaluation processes. Quality management standards such as ISO 9001 and sector-specific standards like IATF 16949 (automotive) mandated systematic supplier evaluation as a condition of certification, embedding multi-criteria scoring into mainstream procurement globally.

Each criterion has a weight (percentage of total score) and each supplier has a score on that criterion (1–10). The weighted score is the sum of (score × weight/100) across all criteria. The maximum possible score is 10.0, achieved only if a supplier scores 10 on every criterion.

The radar chart displays each supplier’s profile across all six criteria simultaneously, making it easy to identify strengths and weaknesses at a glance. A supplier with a large, evenly-shaped polygon is well-rounded. A supplier with a spike in one dimension and weakness in others may be strong for categories where that dimension dominates.

Step 1 — Set weights. Before evaluating suppliers, agree on weights with stakeholders. Weights should reflect this category’s strategic priorities. For a critical single-source component, heavily weight delivery and financial stability. For a commodity with many alternatives, weight price and delivery. Weights should be set before scoring to prevent anchoring bias.

Step 2 — Score independently. If multiple stakeholders are involved, have each person score independently. Average the scores before entering them here. Discuss significant score differences as they reveal important perceptual gaps between functions.

Step 3 — Interpret, don’t just rank. The ranked score is a guide, not a mandate. A supplier ranked second overall may be the right choice if they are significantly stronger on the single criterion most critical to your category. Use the radar chart to understand the shape of each supplier’s profile.

Step 4. Copy the memo for your sourcing decision document. A completed scorecard is essential documentation for procurement governance and supplier feedback.