## Just-In-Time (JIT) Inventory Management
### Definition
JIT is an inventory management philosophy that aims to minimise or eliminate inventory by producing and delivering goods only when they are actually needed — neither earlier nor later.
### Core Principles
1. Demand-Pull System: Production is triggered by actual customer orders, not forecasts. No speculative overproduction.
2. Time-Based Delivery: Deliver to customers precisely when needed — reduces storage and ensures freshness.
### How JIT Works
```
Customer Order Received
↓
Production Initiated (only now)
↓
Raw Materials Ordered from Supplier (timely, small batches)
↓
Product Manufactured and Delivered
```
### Benefits
| Benefit | Explanation |
|---|---|
| Reduced inventory costs | No warehousing, no obsolescence, no carrying cost |
| Increased efficiency | Resources used only when needed → less waste |
| Improved quality | Defects detected early; waste elimination focus |
| Faster market response | Flexible production adapts quickly to demand changes |
### Challenges
| Challenge | Explanation |
|---|---|
| Supply chain vulnerability | Any disruption (delayed shipment, raw material shortage) halts production |
| Demand forecasting dependency | Miscalculation leads to production shortfall or excess |
### Strong Supplier Relationships are Essential
JIT cannot function without reliable suppliers who can deliver small quantities frequently and on time. Long-term partnerships, not transactional buying, are the norm under JIT.
> Contrast with traditional inventory: Traditional systems hold buffer stock to absorb demand and supply variability. JIT eliminates this buffer, pushing the system to be lean but also more fragile.