VMI (Vendor Managed Inventory), known as GPA (Gestion Partagée des Approvisionnements) in French, is a collaborative model in which the supplier itself manages the replenishment of its customer's stock, based on sales and stock-level data shared continuously, rather than the customer triggering each order on its own.
Stock management shifted to the supplier
In a traditional setup, it's the customer who monitors its own stock and places an order with its supplier once it nears the reorder threshold. Under VMI, this role shifts to the supplier's side: the customer regularly shares its stock-outflow and available-level data, most often via electronic data interchange (EDI), and the supplier monitors these levels to propose or trigger replenishment itself, according to rules agreed in advance (min/max thresholds, target safety stock, delivery frequency).
The benefit for the customer is fewer stockouts and less order-management workload; for the supplier, direct visibility into actual demand rather than reconstructed orders lets it smooth out its own production and supply, and limits the so-called "bullwhip" effect that amplifies demand variations from one link of the chain to the next. This model is especially widespread in relationships between manufacturers and large retailers, where it often relies on the same EDI flows used for the shipping notice (ASN/DESADV) or invoicing.
Setting up VMI requires a climate of trust between the two parties, a clear contractual framework defining responsibilities in the event of a stockout, and information systems capable of exchanging stock data reliably and regularly. It's often presented as an alternative or complement to VMI/DDMRP at the level of inter-company relationships, whereas DDMRP operates more internally, on managing buffer stocks within a single organization.
FAQ
What's the difference between VMI and GPA?
No difference in substance: VMI (Vendor Managed Inventory) is the English term, GPA (Gestion Partagée des Approvisionnements) its French equivalent. Both describe the same principle, a supplier who manages the replenishment of its customer's stock directly, based on shared data.
What are the benefits of VMI for the supplier and the customer?
The customer reduces stockouts and order-management workload. The supplier gains visibility into actual demand, which lets it smooth out its production and supply, and limits the overreaction effect seen in traditional supply chains.
Related terms
MRP / DDMRP · Lead time · Safety stock · Service level · OTIF · EDI.
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