Just in time (JIT)
A manufacturing system designed to reduce costly inventories by delivering materials and components “just in time” for production, minimizing waste and improving efficiency through synchronized supply chain operations.
The JIT manufacturing philosophy originated in post-war Japan, notably developed and implemented by Toyota in the 1950s under the guidance of Taiichi Ohno. This system emerged as a response to economic constraints, such as scarce resources and limited factory space, following World War II. By adopting JIT, Toyota focused on reducing overproduction and excess inventory, which aligned with the lean production ethos. The system gained global recognition in the 1980s, as companies worldwide began adopting its principles to compete with Japan’s efficient manufacturing practices.
In the 1980s and 1990s, Just in Time (JIT) symbolized the shift toward globalization in manufacturing. It underscored the interdependence of global supply chains, where raw materials could be sourced from one continent, components assembled on another, and finished products shipped worldwide. This reliance on real-time supply created cultural changes in business strategies, emphasizing collaboration, adaptability, and technological integration to keep pace with demand. Just in Time (JIT) also influenced consumer expectations for rapid delivery and customizability, from cars to fashion.
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JIT was initially inspired by American supermarkets, where shelves were restocked based on customer purchases.
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Some of the first JIT experiments outside Japan were by Harley-Davidson in the 1980s.
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A famous JIT failure involved Toyota in 1997, when a fire at a supplier’s plant disrupted production globally for weeks.
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“Just in Time (JIT) means producing goods only when they’re needed. This saves money and resources by avoiding stockpiles of unused items. Originally from Japan, it’s now a key method worldwide for making everything from cars to clothes”.
Today, Just in Time (JIT) faces challenges and opportunities. During the COVID-19 pandemic, disruptions in supply chains highlighted vulnerabilities in JIT systems, leading to delays and shortages. Companies now explore “Just-in-Case” (JIC) systems that maintain buffer stock for emergencies. Despite this, technological advances like AI, blockchain, and predictive analytics are reinvigorating JIT, making it more agile and responsive. For example, Amazon’s fulfillment systems exemplify Just in Time (JIT) principles, achieving high efficiency in delivery and inventory management.
Just in Time (JIT) minimizes waste by producing only what’s needed, which reduces environmental impacts. For instance, Patagonia incorporates JIT principles to align inventory with demand, cutting surplus that often ends up in landfills. However, JIT’s reliance on global supply chains can increase emissions due to frequent shipments. A practical idea to enhance JIT’s sustainability is to source materials locally or regionally, reducing transportation-related carbon footprints while still achieving efficiency.
- The Toyota Way: 14 Management Principles from the World’s Greatest Manufacturer by Jeffrey K. Liker (Amazon).
- Lean Thinking: Banish Waste and Create Wealth in Your Corporation by James P. Womack and Daniel T. Jones (Barnes & Noble).
- Gemba Kaizen: A Commonsense Approach to a Continuous Improvement Strategy by Masaaki Imai (Amazon).
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