A warehouse ships deterministic daily demand while purchase orders travel through a fixed lead time. Track shelves, inbound trucks, backorders and inventory position separately.
• A 3D laboratory scene with: Warehouse racks; Demand dispatch lane; Inbound purchase orders; Backorder staging board; Inventory-position indicator. • Controls: Demand rate (1-10 units/day); Supplier lead time (1-8 days); Order quantity Q (10-80 units); Reorder point R (0-60 units). • Live readouts: On-hand inventory; Outstanding inbound orders; Backorders; Inventory position; Orders placed; Immediate unit fill rate. • Guided experiments: Cover lead-time demand; Order too late; Multiple orders in transit.
• Inventory position=on hand+on order−backorders • Whenever position≤R, place Q until position>R • Deterministic lead-time demand=d×L; R≥dL avoids shortages after a sufficient startup buffer • Receipts satisfy backorders before filling shelves • One animation second = 0.5 days.
Continuous-review (Q,R) policy with discrete unit demand, fixed lead time, sixty initial units and unlimited backorders. Receipts precede demand at equal timestamps. No stochastic safety-stock calculation, capacity limit, spoilage or lost sales. Visual counts are capped; measurements retain full counts.
No. Inventory position accounts for outstanding orders and backorders.
No. They are filled first at the next receipt.
A reorder point above twenty units supplies a deterministic buffer.
Continuous-review (Q,R) policy with discrete unit demand, fixed lead time, sixty initial units and unlimited backorders. Receipts precede demand at equal timestamps. No stochastic safety-stock calculation, capacity limit, spoilage or lost sales. Visual counts are capped; measurements retain full counts.