Just-in-Time (JIT) is easiest to understand by looking at the trigger, flow and buffer in a real process. The examples below focus on how JIT works operationally rather than attaching the label to every company that carries relatively low inventory.
For the principles, benefits and risks first, see Just-in-Time (JIT) Inventory: How It Works.
Example 1: Toyota Production System
Toyota’s own description of its production system defines Just-in-Time as making only what is needed, when it is needed and in the amount needed. Downstream processes pull required parts from upstream processes, and kanban signals support replenishment.
Important lesson: Toyota does not describe JIT as “zero inventory.” It describes synchronised flow with the minimum practical stock required to keep the process moving.
Example 2: Two-Bin Kanban for Production Components
A production line consumes 200 fasteners per day. The company uses two bins of 300 fasteners each.
- Operators consume from Bin 1.
- When Bin 1 is empty, its kanban signal authorises replenishment.
- Operators switch to Bin 2.
- The supplier or internal store replenishes Bin 1 before Bin 2 is exhausted.
The number and size of bins should be based on consumption, replenishment lead time and required protection against variability. Too many bins create excess inventory; too few create shortages.
Example 3: Supplier Delivery to a Production Line
A factory uses 1,000 components per day and has a reliable local supplier 30 minutes away. Rather than receiving one large monthly shipment, the parties agree smaller scheduled deliveries.
This can reduce:
- Line-side inventory.
- Storage space.
- Handling.
- Obsolescence exposure.
But it only works if the supplier, transport and receiving process are reliable. If a delivery fails and there is no adequate buffer, production can stop.
Example 4: Build-to-Order Final Assembly
A computer assembler keeps common components such as memory, drives and processors but delays final assembly until a customer order is confirmed.
The JIT element is not that every component arrives after the customer order. Instead, the company postpones final configuration and replenishes common components in line with actual consumption.
This can reduce finished-goods obsolescence while still allowing rapid fulfilment.
Example 5: Supermarket-Style Replenishment
A downstream location takes material from a small controlled stock point. The quantity removed becomes the signal for upstream replenishment. The principle is similar to a supermarket shelf: replenish what has been consumed instead of pushing unlimited quantities forward.
This model is widely used in Lean material flow because it makes stock levels and replenishment responsibility visible.
Example 6: Warehouse Pick-Face Replenishment
An e-commerce warehouse does not place a month of inventory in the forward picking area. Instead:
- Fast-moving SKUs have small pick-face quantities.
- When stock falls below a trigger, the WMS creates a replenishment task.
- Reserve stock is moved from bulk storage into the pick face.
- The forward area stays compact while supporting frequent picking.
This uses a JIT-like replenishment principle inside the warehouse: move inventory to the point of use when it is required rather than filling every location to maximum capacity.
Example 7: MRO Consumables
A maintenance store uses gloves, filters and standard consumables every day. A supplier receives weekly consumption data and replenishes defined minimum/maximum quantities.
If the supplier determines replenishment based on agreed data, this may also be a form of Vendor-Managed Inventory.
JIT and VMI are not identical: JIT describes the flow/replenishment philosophy, while VMI describes who manages replenishment.
Example 8: Food Preparation
A food-service operation can apply JIT principles by preparing smaller batches in response to actual demand rather than producing the entire day’s expected volume at once.
This can reduce waiting time, overproduction and food waste, but food-safety, service-time and peak-demand requirements still determine the minimum buffer and preparation plan.
What Makes These Examples JIT?
| Example | Pull / Need Signal | Controlled Buffer |
|---|---|---|
| Production kanban | Container consumed | Defined number of bins |
| Supplier line delivery | Production consumption / schedule | Line-side stock |
| Build-to-order | Customer order | Common components |
| Pick-face replenishment | WMS minimum / task trigger | Forward-pick quantity |
| MRO replenishment | Usage / min-max data | Agreed stock band |
What Is Not Automatically JIT?
- Simply carrying low inventory.
- Ordering late because planning failed.
- Using airfreight to avoid a stockout.
- Reducing safety stock without reducing lead-time variability.
- Receiving frequent deliveries that are not linked to actual consumption.
Useful KPIs for JIT Examples
- Inventory turns.
- Replenishment lead time.
- Kanban shortages.
- Supplier delivery adherence.
- Work-in-process.
- Stockouts / line stoppages.
- Setup time.
- Defect rate.
- Expedited transport frequency.
Common Interview Question
Question: Give a practical example of JIT.
Strong answer: A simple example is a two-bin kanban system. When one bin is consumed, that consumption authorises replenishment while the second bin protects the process during lead time. The key is that actual use triggers the next supply rather than upstream production pushing unlimited stock forward.
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