The document provides training on out-of-stock (OOS) issues for Jumia vendors. It defines OOS, explains Jumia's shipping and order fulfillment processes, and identifies common causes of OOS like lack of inventory, incorrect pricing, and delays. The effects of OOS on a vendor's business are outlined, including lost sales, fines, and potential delisting. Solutions to avoid OOS are presented, such as proper inventory tracking, scheduling fulfillment, and escalating errors.