Struggling with excess inventory costs and inefficiencies? Just-in-time inventory management can help. This strategy minimizes waste by aligning production schedules with raw-material orders. By producing goods only when needed, businesses can cut storage costs and improve efficiency. In this article, we dive into the principles of JIT, its advantages, and practical steps for implementation.

Understanding Just-in-Time (JIT) Inventory Management

Just-in-Time (JIT) inventory management is a strategy that synchronizes raw-material orders with production schedules. The fundamental goal of JIT is to minimize inventory levels by producing goods only as they are needed, thereby reducing inventory holding costs and waste.

Unlike traditional inventory methods that maintain large quantities of stocks, the JIT inventory management method focuses on producing only what is necessary, totally aligning output with customer demand. This approach ensures that raw materials are delivered to the warehouse and then to the production floor at the right time. The right time is a time that will not impact the delivery date and agreed date to receive your products in the customer’s hands.

This approach will improve efficiency and reduce storage costs. Just-in-time manufacturing is an integral part of this process.

To implement JIT in your business, you must have knowledge of every phase, from procurement to delivery, and maintain strong relationships and communication with your suppliers. In the end, many things will be impacted by suppliers in the whole process. You must also optimize the organization and all operations if you want to create a seamless product flow with minimal inventory at all and between all stages. In such a way, you will reduce production costs and also improve product quality in the manufacturing process, leading to operational excellence.

Origins and Evolution of JIT

Just-in-time (JIT) is one of the most significant operations management philosophies developed in Japan in the 1980s that is designed to achieve high-volume production using minimal amounts of inventory. This is achieved by coordinating the flow of materials so that the right parts arrive at the right place in the right quantity; hence, the term just-in-time.

After World War II, Eiji Toyoda and Taiichi Ohno developed the Toyota Production System (TPS), which laid the groundwork for JIT. Their innovative approach aimed at minimizing raw materials on the production floor until an order was received, significantly reducing waste and improving efficiency.

The Toyota Production System emphasized producing only what was needed when it was needed, which became a fundamental principle of the JIT inventory management system. However, JIT is much more than the organized movement of materials and goods in, out, and through the company’s processes. It is a comprehensive management philosophy that is based on teamwork inside and outside the company to achieve continuous improvement in processes and organizational efficiency by eliminating all waste (using 7W).

This methodology has since been adopted by numerous industries worldwide, making JIT a cornerstone of modern inventory management.

Key Benefits of JIT Inventory Management

JIT inventory management brings many benefits, including cost reduction, efficiency gains, and better supplier relationships. By using JIT, you can eliminate waste by not holding excess stock, reducing the risk of unsold stock, damage to products in stock, and total inventory holding costs. This leads to a higher inventory turnover ratio, less obsolescence, and more efficiency.

Another important benefit that JIT can bring to your business is related to the improvement of production cycles by removing all possible bottlenecks (that many times will require in-process stocks) and delays, on-time delivery, and better supply chain operations. A better supply chain and stronger supplier relationships mean a more synchronized and responsive production process.

Also, with the implementation of JIT inventory management, you will improve your business’s cash flow by reducing the money tied up in your inventory, so you can allocate your financial resources more effectively.

Overall, JIT not only reduces waste but also supports ongoing quality improvement in supply chain processes.

Let’s specifically look at two that I think are the most important benefits:

Cost Reduction and Efficiency Gains

What attracts companies to Just-In-Time (JIT) inventory management systems is the way they minimize costs. JIT allows companies to order raw materials and parts on a Just-In-Time basis, only when needed, instead of holding large inventory stocks. This means huge reductions in working capital because the money tied up in inventory and storage is dramatic.

With fewer goods on hand, companies need less warehouse space and fewer people to receive, store, and shelve merchandise. So, labor costs decrease, and so does the amount of cash stranded in inventory. If you don’t have inventory piling up, you are not at risk of damages or becoming outdated. More importantly, you will have more cash available to use for other things that will generate new sales and business.

Suppose inventory is the biggest category on a company’s balance sheet. In that case, cash is tied up in it (lower cash flow), and it can take months to sell off poor-selling items, so it’s difficult to dedicate money to other areas that could help the business more.

JIT also increases productivity and efficiency by allowing you to optimize your production and scheduling. When you know you’ll be getting regular deliveries of quality products, you can schedule production and manufacturing to meet customer demand instead of trying to anticipate and manufacture goods for seasonal dips and spikes.

Why try to build a warehouse full of inventory and hope it sells when you can buy raw materials and parts on a consistent basis and have goods made to order?

Improved Supplier Relationships

JIT is all about building strong relationships with suppliers you can trust. JIT inventory management relies on suppliers who can get quality stuff to you on time so operations can run smoothly. Long-term contracts with suppliers are key to having the materials you need for JIT.

Dell Technologies uses JIT in their supply chain to meet customer demand with minimal inventory. This supplier collaboration reduces supply chain risk and schedules.

In short, strong supplier relationships are key to JIT inventory management.

Challenges and Risks of JIT Inventory Management

While JIT has many benefits, it also has its challenges and risks. The biggest risk with JIT is supply chain disruption which can kill the system. JIT inventory systems rely heavily on timely deliveries and operational efficiency, so they are vulnerable to supplier delays and other logistics issues.

Also, managing a JIT inventory requires skilled and dynamic inventory managers who can adapt to changes. The financial risk is lower profit margins due to immediate stock replenishment. Low visibility during transit is a big risk, which makes it difficult to predict shipment times and manage inventory.

Supply Chain Risks

Supply chain risks are a big problem for JIT inventory management. Disruption in the supply chain can lead to stockouts and impact customer service. JIT inventory systems are more vulnerable to such disruptions since they rely on timely deliveries from suppliers. If a supplier doesn’t deliver on time, it can cause production delays, unhappy customers, and financial loss.

Related: How to Streamline Your Supply Chain Management Process for Optimal Efficiency

Businesses need to build strong relationships with reliable suppliers and create contingency plans to mitigate risks, especially supply chain delays. Good inventory control and regular communication can ensure timely material delivery and minimize delays.

Related: What Does a Supply Chain Manager Do?

Managing Demand Fluctuation

JIT systems can’t cope with sudden surges in customer demand, which can lead to missed sales and unhappy customers. Evaluating current inventory practices and aligning them with JIT principles is key to managing demand fluctuation. Regular communication and trust with suppliers can help JIT inventory management to ensure materials are available when needed to meet customer demand.

Advanced demand forecasting and flexible production schedules can manage demand fluctuation. Monitoring market trends and customer needs can help businesses adjust JIT systems quickly and reduce stockouts and lost sales.

The Elements of Just-In-Time (JIT system)

JIT appears as a result of several methodologies being applied, not as the beginning of a different production philosophy.

Rethinking How Company is Doing Business

The traditional approach to deciding the selling price of a product involves using a formula that collects costs and profits to arrive at the price. For example, if the cost is $30 per piece, and we want a $6 profit, the price will be $36. This is the traditional cost-plus-pricing strategy.

In this formula, if the cost increases, raising the price is the most effective way to keep the same profit while ensuring that the product’s added value remains unchanged.

Toyota used a totally different approach, using the same formula but bringing a totally new perspective. They calculate a profit when subtracting the costs from the selling price:

Using this formula, if the market (customers) sets the price of a car, the only way to profit is to cut costs. While this approach is widely used today, it was once a groundbreaking method for managing a company.

A new philosophy was implemented to ensure Toyota operated efficiently, like a supermarket with fresh goods that needed to be sold quickly. The system must be able to replace any product that is removed quickly to avoid disruptions. To achieve this, it was crucial to systematically identify and eliminate all business and production inefficiencies and wastes.

The Basic JIT Tools

5S

The name “5S” comes from a list of five Japanese words, starting with the letter “S.”

• Seiri – Sorting.
• Seiton – Set everything in order.
• Seisi – Shining or cleaning.
• Seiketsu – Standardize.
• Shitsuke – Sustain.

You can read more about 5S in our article about “How to Use 5S to Improve Your Workplace Organization.”

7W

7W is a systems approach that can help you analyze and find possible improvements by removing waste. One of the seven wastes is inventory waste. The tool that can help you design your business strategy, categorizing all unproductive manufacturing practices identified by Taiichi Ohno, the father of the Toyota Production System (TPS).

Related: The 7 Wastes: A Guide to Eliminating Waste in Your Company

Standard Operations

Standard work is a key part of lean and Just-in-Time (JIT) inventory management. This means creating a consistent and repeatable process for every task on the production line so efficiency and quality are maintained.

By defining the best practices and setting standards, you can reduce variation, reduce waste, and increase productivity. Standard work simplifies workflows, aligns to market demand, and supports continuous improvement, which is what JIT systems are all about.

One-Piece Flow

One-piece flow is a lean manufacturing principle where you produce one piece at a time, not in batches. This is core to JIT inventory management as it aligns production to market demand and customers. With a one-piece flow, you will reduce lead times and minimize work-in-process inventory.

Here is how much time we will need to produce four pieces of product in batch production where we have three processes, each need one minute to finish one piece of product:

With one-piece flow, you focus on single-unit production so your business can adapt quickly to changes in demand and reduce waste. So, you can save eight minutes for processing four pieces.

This method simplifies the process so each piece moves through the production line without delay and improves product quality and operational efficiency.

Leveling the Production Line

Leveling the production line, also known as “Heijunka” in lean manufacturing, is another part of JIT inventory management. This means smoothing out the production schedule so the workflow is consistent and balanced, minimizing the peaks and troughs of production demand. By spreading production over time, you will reduce inventory and avoid the inefficiencies of fluctuating workloads.

In a JIT context leveling the production line means aligning the manufacturing process to customer demand so products are produced at a steady rate without overloading resources or creating excess inventory. This will improve operational efficiency and support continuous improvement by identifying and eliminating waste in the process.

Visual Control Tools

Poka-Yoke

Poka-yoke is designed to prevent errors and defects in the processes. It involves implementing simple yet cost-effective mechanisms or devices that automatically detect and prevent mistakes before they even occur.

In such a way, Poka-Yoke ensures minimizing possible human errors and improves product quality and process efficiency. Poka-Yoke supports the JIT approach of producing only what is needed when it is needed, without excess inventory or waste.

TPM (Total Productive Maintenance)

TPM focuses on maintaining and improving equipment reliability to ensure that production processes run without problems and interruptions.

By involving all employees in regular maintenance activities and fostering a proactive approach to equipment care, TPM can help you minimize downtime and defects and, in such a way, support the JIT philosophy of producing only what is needed when it is needed.

Kanban

Kanban is another visual management tool that uses cards or signals to manage workflow and inventory levels, ensuring that materials are replenished just in time for production.

This system helps you to prevent overproduction and minimizes waste by aligning production with actual demand.

How to Implement JIT Inventory Management in Your Business

JIT inventory management requires planning and execution. JIT principles are predictable production, perfect flows, great quality, and great vendors. Businesses need to review their supply chain, build strong supplier relationships, improve demand forecasting, and adopt a Kanban system.

Technology, including AI, can help with real-time demand insights, supply chain optimization, and automation. Continuous improvement of operations and capabilities is key to successful and sustainable JIT as it’s a journey, not a destination.

Review Your Current Inventory System

Reviewing your current system regarding inventory in your company is the first step you must take. The goal is to ensure it’s compatible with JIT. This review identifies areas for improvement and aligns current inventory practices with JIT principles.

Reviewing inventory levels, storage capacity, and production schedules will highlight inefficiencies and bottlenecks that need to be addressed. Find answers to the following questions:

• Why must you have inventories?
• Is it because of variability inside your processes or the variability of the suppliers?
• Is it because of mistakes and effective products inside your production process?
• What is your storage capacity? How much does it cost you the storage capacity? What is the warehouse utilization?
• Do you need in-process stocks? Why do you need in-process stocks?

By doing a detailed review of your current inventory system, you can develop specific strategies to help you reduce waste, reduce costs for inventories, and improve your overall efficiency. This first step is critical to a smooth transition to JIT inventory management, so the new system is tailored to the business’s specific needs and challenges.

Build Your Supplier Network

Building strong vendor relationships is key to JIT inventory management. Established businesses with good vendors and supply chain processes are best suited for JIT. They have a better understanding of seasonality and demand fluctuations which makes JIT implementation smoother.

Reliable suppliers are critical for on-time material delivery in JIT. To effectively start with JIT implementation, ensure long-term contracts with suppliers to reduce risks across the entire supply chain and ensure quality materials are available.

Strong supplier networks are the backbone of JIT inventory management and supply chains so businesses can run smoothly and meet market demand.

Technology and Software

Technology and software is key to JIT inventory management. Inventory management software supports JIT by streamlining and automating processes. Cloud-based jit inventory system software has features like process automation, centralized data management, and robust analytics to improve operational efficiency.

ERP systems can integrate multiple functions to improve JIT. For example, ThroughPut has AI-powered decision intelligence software that helps businesses implement JIT with ease, providing real-time insights to support inventory management aligned to JIT principles.

Using electronic ordering systems to streamline communication and automate supply orders is also a common practice to ensure timely material availability.

Kanban and Its Role in JIT Inventory Systems

Kanban controls the production process and inventory movement in JIT inventory management. It supports the JIT framework by showing the production flow, identifying bottlenecks, and providing material on time. By attaching a visual cue (a card) to each item in the process, Kanban helps to control inventory and prevent overcapacity.

The importance of Kanban in JIT inventory management is to identify problems, measure lead and cycle times, and manage material flow. This allows businesses to have minimal inventory and material available just in time, reducing inventory costs and improving efficiency.

How it works

A Kanban system involves attaching a card to each component or raw unit, a signal to replenish inventory. In a JIT system, these Kanban cards ensure material is available just in time for production, with no overstocking and no waste.

The visual signals of Kanban help to streamline the process by showing when more material or product is needed. This systematic approach ensures only what’s needed is produced based on actual orders, more flexibility, and efficiency.

Benefits of Kanban in JIT

Using Kanban in JIT brings several benefits, including production flexibility and waste elimination. Kanban and JIT together bring overall production efficiency by having products available without excess inventory.

Kanban helps to increase efficiency by using visual signals to show when more material is needed, no waste due to overproduction. This is in line with JIT methodology as it supports just-in-time delivery and reduces inventory costs by having optimal inventory levels.