production planning

**Production planning** is the **integrated process of translating demand forecasts and commitments into executable manufacturing schedules, resource plans, and release targets** - it coordinates capacity, materials, and timing across planning horizons. **What Is Production planning?** - **Definition**: Cross-functional planning framework spanning long-range capacity decisions to short-range lot release plans. - **Planning Levels**: Strategic horizon for capital and hiring, tactical horizon for aggregate output, and operational horizon for daily dispatch. - **Input Sources**: Customer demand, inventory position, tool availability, yield assumptions, and supply constraints. - **Output Artifacts**: Start plans, output commitments, material requirements, and risk-adjusted execution scenarios. **Why Production planning Matters** - **Demand Alignment**: Converts market requirements into realistic factory execution targets. - **Capacity Coordination**: Prevents mismatch between starts, bottlenecks, and downstream capability. - **Inventory Control**: Balances service level against WIP and finished-goods cost. - **Risk Readiness**: Scenario planning improves response to demand shifts and equipment disruptions. - **Operational Discipline**: Provides a stable baseline for scheduling and dispatch decisions. **How It Is Used in Practice** - **Horizon Integration**: Link long-term capacity plans with rolling weekly and daily execution controls. - **Constraint Planning**: Include tool, material, and staffing limits in schedule generation. - **Plan-Actual Review**: Track adherence and close gaps with corrective planning actions. Production planning is **the coordination backbone of fab execution** - strong planning discipline enables reliable delivery, controlled inventory, and efficient use of manufacturing resources.