Kanban
Quick facts
| Category | Visual, consumption-driven replenishment signaling system |
|---|---|
| Used by | Manufacturing, warehousing, healthcare, software development and other industries managing workflow and inventory |
| Also called | None widely standardized |
| Related standards | None specific |
| Related processes | Just-in-time manufacturing, lean manufacturing, manufacturing inventory control |
| Semantic match | Kanban, visual signaling system, pull-based replenishment, Toyota Production System |
What is Kanban?
Kanban, translated from Japanese as "visual card" or "signboard," was inspired by how supermarkets restock shelves, replacing only what customers actually purchased rather than maintaining excessive backroom inventory ahead of uncertain demand.
In its traditional manufacturing form, a Kanban card travels with a container of parts; when the container is emptied, the card is returned upstream, signaling that it is time to replenish that specific item. The number of Kanban cards or the container size is calculated based on consumption rate, replenishment lead time, and a safety factor accounting for variability.
While Kanban originated with physical cards, the same pull-based signaling concept has been widely adapted into digital Kanban boards, both in manufacturing and, more broadly, in software development and project management contexts for visualizing and managing workflow.
Why is Kanban important?
Kanban keeps inventory levels closely aligned with actual consumption, avoiding the excess stock and associated carrying costs that result from producing or ordering based on rough demand estimates alone.
Because Kanban is a visual system, it gives everyone on the floor an immediate, intuitive way to see replenishment status without needing to check a separate reporting system or spreadsheet.
Kanban directly supports Just-in-Time manufacturing's broader goal of producing only what is needed, when it is needed, helping expose and address inefficiencies rather than allowing excess inventory to mask underlying process problems.
How does Kanban work?
A typical Kanban implementation includes:
- Pull point definition. Determine which materials will be managed through Kanban signals.
- Card or signal design. Define the Kanban card or digital signal and the information it carries.
- Sizing. Calculate container size or card count based on consumption rate and lead time.
- Consumption. Use material at the point of use, triggering the Kanban signal when depleted.
- Replenishment. Restock the depleted item based on the signal, without waiting for a separate purchase or production order.
- Ongoing adjustment. Refine card counts or container sizes as consumption patterns change.
Kanban vs. Traditional Forecasted Replenishment
| Comparison | Kanban | Traditional Forecasted Replenishment |
|---|---|---|
| Trigger | Actual consumption | Forecasted demand |
| Inventory impact | Tends to minimize excess stock | Can result in overstock if forecasts are inaccurate |
Real-world examples of Kanban
A manufacturer uses physical Kanban cards on the shop floor, with an empty parts container automatically triggering replenishment from an upstream supply area without requiring a manual purchase request.
A distribution center implements a two-bin Kanban system for fast-moving components, replenishing one bin while the other is in active use, ensuring continuous availability without excess stock.
A software development team adapts the Kanban concept into a digital board, visualizing work items moving through stages such as "to do," "in progress" and "done" to manage workflow.
Regulations and standards related to Kanban
Kanban is not a regulatory requirement itself, but its consumption-driven replenishment approach supports broader inventory accuracy and lean process control expectations relevant to quality management systems.
How QT9 helps with Kanban
QT9 ERP Kanban capabilities
- Use lean tools to manage pull systems, reorder points and batch sizes.
- Support Kanban-based replenishment alongside broader MRP planning.
- Track inventory consumption in real time to trigger accurate replenishment.
- Connect Kanban signals to purchasing and production workflows.
- Provide visibility into inventory status across multiple locations.
- Support both traditional card-based and digital Kanban approaches.
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Common mistakes with Kanban
Common mistakes include implementing Kanban cards or signals while system inventory records remain inaccurate, undermining the pull system since replenishment decisions rely on trustworthy consumption data.
Other problems include allowing production to override or ignore Kanban signals under pressure, effectively reverting to push-based production and losing the discipline the system is meant to enforce.
Frequently asked questions
Related quality management terms
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