1. Introduction and Objectives
Traditional “Just-in-Case” manufacturing relies on large inventory buffers to absorb production errors, creating hidden carrying costs. Developed by Toyota and standardized across Western manufacturing, Just-In-Time (JIT) seeks to eliminate inventory entirely by synchronizing production directly with demand.
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2. Mechanics of a JIT Ecosystem
- Pull System via Kanban: Production is triggered solely by actual customer demand, rather than pushing inventory onto market shelves based on long-range forecasts.
- Zero-Inventory Philosophy: Carrying inventory is viewed as an operational waste (muda) that conceals underlying inefficiencies such as poor machine reliability or defective workflows.
- Supplier Partnerships: Requires long-term agreements with a small network of highly reliable suppliers situated near the factory. Suppliers must deliver small batches directly to the shop floor, multiple times per day, with zero defects.
3. Backflush Costing Systems
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Traditional costing tracks materials meticulously through every step:
Raw Materials -> WIP -> Finished Goods -> COGS.Because JIT speeds up manufacturing cycles and reduces on-hand stock to near zero, traditional transactional tracking becomes overly burdensome. Companies use Backflush Costing, a streamlined system that eliminates WIP ledgers entirely. Instead, costs are flushed straight into the system at the very end of the line, automatically drawing down inventory balances based on the standard Bill of Materials for the finished units produced.
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