Just-in-time (JIT)
Just-in-time is a manufacturing and inventory philosophy that minimizes inventory by scheduling deliveries to arrive exactly when needed for production or sale. JIT aims to eliminate waste from excess inventory, reduce carrying costs, and improve quality by exposing problems that inventory buffers would hide. Success requires reliable suppliers, precise scheduling, and robust processes.
Examples
Automotive JIT: An automaker receives seats from a supplier sequenced to match vehicles on the assembly line, arriving hours before installation. No seat inventory exists at the plant; seats flow directly from truck to line.
Manufacturing cell JIT: A production cell receives components in small containers just before they're needed, with suppliers delivering multiple times daily. Work-in-process inventory is minimal, and problems are immediately visible.
Retail JIT: A retailer uses point-of-sale data to trigger automatic replenishment, receiving daily deliveries that match actual sales patterns. Backroom inventory is minimized as stock flows directly to shelves.
Definition
JIT originated in Toyota's production system as part of lean manufacturing principles. The approach spread globally as companies sought to reduce inventory costs and improve responsiveness. However, JIT requires conditions that not all supply chains can achieve.
JIT prerequisites include reliable suppliers who deliver on time with consistent quality, short and predictable lead times, stable demand patterns or flexibility to respond to variation, and robust processes that don't create quality problems requiring buffer inventory.
JIT risks became visible during supply chain disruptions. Without buffer inventory, any supply interruption immediately stops production. The COVID-19 pandemic and subsequent shortages prompted many organizations to reconsider pure JIT approaches in favor of more resilient inventory strategies.
Modern interpretations of JIT balance inventory minimization with appropriate buffers for supply uncertainty. The goal is eliminating unnecessary inventory while maintaining buffers that genuinely protect against risk.
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