Which signaling method is associated with pull systems and triggers replenishment when downstream needs arise?

• A. Lead-time offset
• B. Lean production
• C. Level schedule
• D. Kanban

Answer: (D)

In a pull system, replenishment is driven by actual consumption, not forecasted demand. The signaling method used to trigger that replenishment is Kanban. A Kanban provides a visual or card-based signal that tells upstream processes to produce or move a specific quantity of parts only when the downstream process uses them up. This keeps work-in-process at the right level, smooths flow, and prevents overproduction. When a container empties or a Kanban card is returned, the upstream operation replenishes that item, aligning production with real need.

Lead-time offset is a scheduling concept that releases orders based on lead times, which is more aligned with push or forecast-driven approaches. A level schedule aims to keep production consistent over time, regardless of immediate demand, and lean production is a broad philosophy that includes various tools, with Kanban being the signaling method directly associated with pull systems.