Kanban Replenishment
Is kanban replenishment the same as MRP?
No. Kanban replenishment is a consumption-triggered pull system, while MRP is forecast- and schedule-driven planning.
What does the kanban card or signal represent?
It is an authorization to replenish a specific item in a specific quantity, usually tied to a container, bin, or withdrawal route.
Can kanban work with external suppliers?
Yes. Supplier kanbans can generate purchase requests, and kanbans may also trigger inter-organization transfers.
Kanban replenishment is a pull-based material replenishment system that authorizes new supply only after a downstream consumption signal is received, such as a card, empty bin, scan, or electronic trigger. In manufacturing and warehousing, it reorders the exact replenishment lot for a specific item between storage, production line, or external supplier when the consuming location depletes its stock.
On the shop floor, parts are stored at the line in standard containers carrying a fixed quantity. When the last part is removed, the empty container or a kanban card becomes the consumption signal, authorizing replenishment of that exact quantity from a supermarket, warehouse, or upstream process. In practice, operators scan, remove, or physically move the signal when inventory is depleted, and the upstream process then produces or delivers a standard lot that returns the system to a full state. In systems like SAP, Oracle, or Dynamics 365, kanban can govern physical stock at the point of consumption and trigger either internal transfers or supplier replenishment depending on configuration. This works best when container size, replenishment quantity, lead time, and consumption rate are stable enough for the loop to cycle without interrupting production. The practical result is material flow aligned to actual usage, limiting work-in-process and supporting just-in-time control.
Under-sized kanban quantity: When container quantity or the number of kanbans is too low for actual demand and replenishment lead time, the consuming line empties before refills arrive, causing stockouts and line stoppages.
Signal loss or process drift: If an empty bin, card, or scan is missed, delayed, or detached from the wrong container, replenishment is not triggered, breaking the pull loop and causing hidden shortages even when inventory physically exists elsewhere.
Lead-time instability: If supplier transit, internal transport, or upstream production time varies too much, the kanban cycle cannot reliably return material before the next depletion, causing bottlenecked receiving, expedited moves, or emergency shortages at the point of use.