pull system

**Pull system** is the **the production control model where upstream work is triggered by actual downstream consumption** - it prevents overproduction and aligns output with real customer demand instead of forecast-only push schedules. **What Is Pull system?** - **Definition**: Replenishment logic that authorizes production only when downstream inventory is consumed. - **Contrast to Push**: Push builds to plan; pull builds to demand signal with controlled WIP limits. - **Core Elements**: Demand trigger, replenishment rules, lead-time discipline, and visible WIP boundaries. - **Operational Goal**: Stable flow with minimal excess inventory and rapid demand responsiveness. **Why Pull system Matters** - **Overproduction Control**: Pull directly limits unnecessary output and related inventory risk. - **Cash Efficiency**: Lower WIP and finished goods reduce working-capital burden. - **Flow Clarity**: Demand-linked pacing exposes true process bottlenecks faster. - **Customer Alignment**: Production mix follows real orders more closely than forecast-driven release. - **Lean Integration**: Pull is foundational for kanban, takt planning, and one-piece flow systems. **How It Is Used in Practice** - **Signal Design**: Define consumption points and replenishment quantities for each flow segment. - **WIP Governance**: Set strict maximum inventory levels and escalation when limits are exceeded. - **Stability Support**: Improve setup time, reliability, and planning accuracy to sustain pull cadence. Pull system is **the control backbone of demand-driven manufacturing** - producing to real consumption improves flow efficiency, inventory health, and delivery reliability.