A number of lean manufacturing tools and practices have long been used to reduce manufacturing waste. These include the five S's, visual controls, standardized work, mistake proofing, total productive maintenance, cellular manufacturing, single-digit setup, pull systems, sequencing, activity-based costing, and leveled production.
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signal comes from the user. Likewise, in distribution, there would be a pull system for replenishing field warehouse inventories, where replenishment decisions are made at the field warehouse itself, not at the central warehouse or plant. Conversely, materials requirements planning (MRP) is a push system, which schedules production based on forecasts and customer orders. Thus, MRP creates plans to push materials through the production process based on forecasts that by nature cannot be accurate. That