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Procurement Glossary
Just-in-Time: Definition, Methods, and Application in Procurement
March 30, 2026
Just-in-Time is a production and procurement strategy aimed at delivering materials and components exactly when they are needed. This method significantly reduces inventory levels and optimizes cash flow in companies. Below, learn what Just-in-Time means, which methods are used, and how current developments affect procurement.
Key Facts
- Originated in the Japanese automotive industry at Toyota in the 1970s
- Reduces storage costs by up to 50% through demand-driven delivery
- Requires reliable suppliers with short and stable lead times
- Works optimally for standardized products with predictable demand
- Increases dependency on suppliers and their delivery capability
Content
Definition: Just-in-Time
Just-in-Time refers to a production and procurement philosophy in which materials, components, and products are delivered exactly at the time they are needed.
Core principles of the Just-in-Time approach
The foundation is the elimination of waste in all forms. Key elements are:
- Demand-driven production without overproduction
- Minimization of inventory levels and interim storage
- Continuous improvement of processes
- Close collaboration with reliable suppliers
Just-in-Time vs. traditional warehousing
In contrast to traditional stockholding with high Safety Stock, Just-in-Time operates with minimal buffers. While traditional Inventory Management focuses on availability, Just-in-Time focuses on precise demand planning and short Lead Time.
Importance of Just-in-Time in procurement
For procurement, Just-in-Time means a fundamental realignment of supplier relationships. Materials Planning must be precisely aligned with the production rhythm, which requires close coordination between procurement, production, and suppliers.
Methods and approaches
The successful implementation of Just-in-Time requires specific methods and systematic approaches in procurement.
Kanban system as a control tool
The Kanban System is the core of Just-in-Time control. Material replenishment is triggered via visual signals:
- Cards or electronic signals control the material flow
- Pull principle: replenishment only takes place when there is actual demand
- Reduction of excess inventory through demand-driven triggering
Supplier integration and partnerships
Just-in-Time only works with reliable suppliers. Selection is based on strict criteria for delivery reliability and quality. Long-term partnerships enable joint process optimization and significantly reduce Lead Time Variability.
Automated planning and order triggering
Modern Just-in-Time systems use Automated Replenishment for order triggering. ERP systems generate Purchase Order Recommendation based on consumption data and production plans, minimizing human error and shortening response times.
Important KPIs for Just-in-Time
Measuring the success of Just-in-Time requires specific KPIs that reflect both efficiency and risks.
Delivery service and on-time delivery
The Fill Rate measures on-time delivery and is critical for Just-in-Time success. Target values are typically above 98%. Measuring Lead Time Variability reveals supplier reliability.
Inventory KPIs and capital commitment
The Inventory Coverage should be minimal in Just-in-Time, typically under 5 days. Average Inventory is continuously monitored to identify deviations from the Just-in-Time principle.
Quality and process efficiency
Quality metrics such as defect rate and complaint rate are especially critical in Just-in-Time. Inventory Metrics such as turnover rate and days of supply show the efficiency of the system. An Inventory Health Dashboard provides a real-time overview of all relevant metrics.
Risks, dependencies, and countermeasures
Just-in-Time involves specific risks that can be minimized through appropriate measures.
Supplier dependency and disruption risks
The high dependency on a small number of suppliers represents the biggest risk. Supply failures can stop production immediately. Countermeasures include qualifying secondary suppliers and implementing Backorder Rate for critical materials.
Quality issues and their effects
In Just-in-Time, quality defects lead directly to production disruptions because no buffer inventory is available. Preventive quality assurance at the supplier and strict incoming inspections are essential. Cycle Counting helps with continuous inventory monitoring.
Forecast uncertainty and demand fluctuations
Inaccurate Forecast Error can lead to stockouts or excess inventory. Flexible supply contracts with adjustable quantities and short Replenishment Lead Time reduce these risks. Regular demand analyses and rolling planning increase planning accuracy.
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Practical example
An automotive manufacturer implements Just-in-Time for seat assembly. The seats are delivered by the supplier in the exact sequence of vehicle production, synchronized with the production line. This sequenced delivery eliminates interim storage completely, and assembly takes place directly from the truck. The result: 60% less storage space, 40% reduced capital commitment, and 95% less handling effort.
- Electronic call-off signals control delivery 4 hours before demand
- Quality inspection takes place at the supplier before shipment
- A backup supplier is available for emergencies
Current developments and impacts
Just-in-Time is continuously evolving and is influenced by new technologies and changing market conditions.
Digitalization and AI-supported forecasting
Artificial intelligence is revolutionizing Consumption Forecast for Just-in-Time systems. Machine learning algorithms analyze historical data and external factors to create more precise demand forecasts. This significantly reduces both stockouts and excess inventory.
Resilience vs. efficiency after global crises
The COVID-19 pandemic and supply chain disruptions have challenged the pure Just-in-Time concept. Companies are developing hybrid approaches that combine efficiency with strategic Safety Stock for critical components.
Sustainability and Just-in-Time
Environmental aspects are becoming more important. More frequent, smaller deliveries can increase the CO2 footprint. Modern approaches integrate sustainability criteria into Inventory Optimization and develop environmentally friendly transport concepts for Just-in-Time deliveries.
Conclusion
Just-in-Time remains a powerful tool for reducing costs and increasing efficiency in procurement. Digitalization opens up new possibilities for more precise forecasts and automated control. At the same time, global uncertainties require a balanced trade-off between efficiency and resilience. Successful Just-in-Time implementation relies on strong supplier partnerships, robust processes, and continuous adaptation to changing market conditions.
FAQ
What is the difference between Just-in-Time and Just-in-Sequence?
Just-in-Time delivers materials at the right time, while Just-in-Sequence additionally takes the exact production sequence into account. Just-in-Sequence is the further development for complex variant production, where not only timing but also the delivery sequence is crucial.
Which industries are best suited for Just-in-Time?
The automotive industry, electronics manufacturing, and mechanical engineering benefit the most from Just-in-Time. Requirements include standardized products, predictable demand, and reliable suppliers in close geographic proximity. Industries with high product variety or irregular demand are less suitable.
How do you calculate the optimal order quantity in Just-in-Time?
In pure Just-in-Time, the order quantity corresponds to the exact requirement without safety buffers. In practice, small lot sizes are used based on daily demand or shift demand. The supplier's Minimum Order Quantity (MOQ) and transport costs limit flexibility.
What risks arise from Just-in-Time and how can they be minimized?
The main risks are supply failures, quality problems, and demand fluctuations. These can be minimized through supplier audits, secondary supplier qualification, flexible contracts, and hybrid approaches with strategic safety stocks for critical components. Continuous monitoring of the supply chain is essential.
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