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I prefer to mention the below:
5R Rule as a Purchase Concept (Right product from the Right supplier at the Right cost delivered to Right place at the Right time).
interms of Purchasing Key words:
1) PROCURE TO PAY CYCLE (P2P)
2) PURCHASE ORDER CYCLE TIME
3) SUPPLIER COMPLIANCE RATE
4) COST AVOIDANCE AND COST REDUCTION
5) TOTAL PROCUREMENT ROI