What method is used to manage work-in-progress by signaling for replacement stock?

The method that is used to manage work-in-progress by signaling for replacement stock is Kanban. This approach originated from Toyota's production system and is designed to improve efficiency by allowing teams to visualize their work and manage inventory levels effectively.

Kanban relies on the use of visual signals, typically cards or boards, to indicate when more stock is needed. When an item is used or a stage of production is completed, it triggers a signal to replenish that item, ensuring that the workflow remains smooth and consistent without overstocking.

The Kanban system supports the Just-In-Time production philosophy by ensuring that materials arrive only as they are needed in the production process, thereby minimizing waste and reducing inventory costs. This leads to optimized production flow and the ability to respond quickly to changes in demand.

Other methodologies like Kaizen focus on continuous improvement, while Six Sigma aims to reduce defects and improve quality through statistical analysis and process improvements. However, neither of these directly addresses the signaling aspect of managing work-in-progress inventory in the same way Kanban does.