What is Just-in-Time (JIT) in Production?
Definition of JIT and its Principles
JIT, a production management approach, requires the delivery of components exactly when the operator needs them.
With this system, any excess inventory is considered waste. Its core principles include: pull flow, small batch size, stable cadence, continuous improvement, and cycle time control.
Origins and Evolution of JIT
Just-in-Time (JIT) was born in the Japanese automotive industry in the 1970s, driven by Toyota and Taiichi Ohno.
Faced with limited resources, they designed an agile production system with no capital immobilization or accumulation of dormant stocks. Since then, the JIT method has become inseparable from the principles of lean management, with a core objective to eliminate waste at every stage of the value chain.
The Benefits of JIT in Production
Reduction of Storage Costs
By producing only what is necessary, when it is necessary, Just-in-Time allows companies to drastically reduce inventory levels. No more overstocked warehouses and unnecessarily immobilized capital. The company frees up space, lightens inventory, and saves on insurance, handling, and material depreciation.
Improved Flexibility and Responsiveness
JIT offers companies a much higher adaptability to changes in demand. By shortening the time between order and delivery, it becomes easier to quickly adjust production to actual market needs.
Optimization of Production Processes
Pull flow highlights every delay, error, and wait: all are opportunities for improvement. Teams measure takt time (market-driven pace) and adjust planning daily.
How to Implement JIT in Production?
Assessment of Raw Material Needs
Every project begins with a flow study and hourly consumption measurement. The minimum “trigger quantity,” calculated for each component, prevents stockouts while reducing inventory.
Close Collaboration with Suppliers
A reliable Just-In-Time system requires tight coordination and frequent deliveries. Before starting the transformation, a factory audit of each supplier ensures delivery capacity.
Technology Integration for Flow Management
ERP tools unify production data, inventory, and downtimes. They reduce human error and trigger alerts when a delay is imminent. Real-time management provides greater visibility.
Improving Risk Management in a JIT System
JIT systems are sensitive to disruptions: pandemics, strikes, breakdowns, natural disasters… It’s crucial to identify all risks, create secondary supply loops, store a buffer of critical materials, and maintain an alternative transport plan.
The Challenges of JIT in Production
Dependence on Suppliers and Deadlines
Even a slight delay can halt the entire production chain. Companies must diversify sources, share forecasts, use daily logistics performance indicators, and implement dual sourcing for critical parts.
Managing Unexpected Supply Chain Events
The Just-in-Time model relies on flawless coordination across the supply chain. A supply disruption, delivery delay, or external incident (strike, weather issue, health crisis) can quickly disrupt production.
Integrating alert systems, backup suppliers, or limited buffer capacities helps secure the chain without undermining the JIT logic. The goal is to maintain agility while minimizing risk exposure.
Implementation and Adjustment Costs
Switching to a Just-in-Time production mode requires significant upfront investment. Flow mapping, workstation reconfiguration, process digitization, team training… all need to be planned and budgeted. Additionally, adopting JIT requires gradual adjustment of internal processes, often accompanied by a shift in managerial culture. While ROI is tangible in the medium term (reduced stock, increased productivity, lower non-quality costs…), it requires a controlled transition.
Why Choose MWT Sourcing to Implement JIT in Your Production?
MWT Sourcing’s Expertise in Production Process Optimization
MWT Sourcing has supported manufacturers for years in transforming their logistics organizations. Their expertise covers the entire chain: on-site diagnostics, flow audits, stock analysis, supplier capacity evaluations, and KPI definitions. A specialist in Just-in-Time, MWT Sourcing offers a proven methodology to align operations with lean manufacturing principles.
Tailored Solutions to Meet Your Needs
Every company has its specifics: space constraints, production pace, seasonality, supplier dependency… That’s why MWT Sourcing designs fully customized JIT solutions. The team tailors each lever (planning, procurement, real-time management, digital tools) to your operational goals.
Complete Support for a Successful Transition to JIT
MWT Sourcing mobilizes a multidisciplinary team to map your flows and set stock targets with each supplier. Regular audits verify KPIs, correct deviations, and safeguard JIT against logistical risks.
Common Mistakes When Implementing JIT and How to Avoid Them
Neglecting the Importance of Communication with Suppliers
Without a shared plan, even the best method fails. Weekly reviews, transparent KPIs, and a hotline address issues before they reach the shop floor.
Underestimating Risk Management in a JIT System
Relying on a single carrier or port can halt production. Double your routes, pre-pack an emergency kit, and set an automatic alert when cumulative delivery deviates by an hour!
Ignoring the Need for Reliable Flow Management Technology
Diverging spreadsheets cause disruptions. A unified software ensures data consistency and system stability.
JIT requires discipline, communication, and time management. With expert guidance and reliable data, it becomes a real competitive advantage: less capital tied up, more flexibility, production aligned with demand, and better customer service.
