Abstract: Aspects of the present invention provide a supply chain system to get to a just-in-time inventory. Aspects of the invention generate a suggested reorder quantity by comparing the item's reorder point (quantity at which to reorder the item from the vendor) to the dynamic inventory level for the item. The dynamic inventory level=(Quantity in inventory+Quantity on Order?(Forecast Usage)). The forecast usage comprises anticipated consumption of the item derived from one or more presently scheduled clinical events. Presently scheduled events have not yet taken place and are scheduled to take place in the future. The event takes place when a clinician provides a clinical service to a patient. For example, a surgery may be scheduled to occur three days from the present time. The items scheduled for use in the surgery form part of the forecast usage for the item. The forecast usage may comprise items from multiple scheduled clinical events.