engineering lot priority

**Engineering lot priority** is the **dispatch ranking policy for non-revenue lots used in process development, qualification, and troubleshooting** - it balances learning speed with production delivery obligations. **What Is Engineering lot priority?** - **Definition**: Priority framework that assigns engineering lots a controlled position in the dispatch hierarchy. - **Lot Types**: Includes DOE runs, monitor lots, qualification wafers, and failure-analysis support lots. - **Hierarchy Role**: Usually below urgent customer production lots unless formally escalated. - **Policy Risk**: Uncontrolled reclassification of engineering lots as hot can disrupt fab commitments. **Why Engineering lot priority Matters** - **Learning Throughput**: Adequate priority is required to sustain process improvement and node transitions. - **Revenue Protection**: Over-prioritizing engineering flow can harm output and customer delivery. - **Governance Clarity**: Clear rules reduce ad hoc conflicts between operations and engineering groups. - **Cycle-Time Balance**: Right priority avoids excessive engineering delay without destabilizing line flow. - **Strategic Execution**: Supports long-term capability development while meeting near-term production goals. **How It Is Used in Practice** - **Tiered Policy**: Define normal, elevated, and emergency engineering priority classes. - **Approval Workflow**: Require management signoff for hot engineering lot upgrades. - **Performance Review**: Monitor engineering-lot turnaround and production impact in weekly operations meetings. Engineering lot priority is **a key cross-functional scheduling control** - balanced prioritization protects both immediate factory output and long-term process learning objectives.