Meaning
Accumulation of partially completed subassemblies, batch materials or components waiting in line at a manufacturing work center for the next processing operation. Monitoring the work in progress queue governs shop floor buffer management, manufacturing lead time and work-in-progress inventory valuation. Application stops at completed finished goods stock or raw material storage areas before job order release.
Queue Behavior
Work center bottlenecks create inventory accumulation when upstream production rates exceed downstream processing capacity. Managing a work in progress queue requires adjusting production release schedules to match the bottleneck work center cycle time. High queue volumes increase total factory lead time and absorb operating working capital in buffer inventory.
Kanban pull systems limit queue sizes by preventing upstream operations from producing parts until downstream demand signals release. Visual factory boards display queue levels to alert shop floor supervisors to flow imbalances.
Lead Time Impact
Excess inventory buffers between work centers inflate manufacturing throughput times and obscure floor operational problems. Expanding a work in progress queue increases physical space requirements and risks part damage during material handling. Operational agility decreases when shop floor queues grow.
Buffer Optimization
Production schedulers balance queue sizes to maintain high bottleneck machine utilization without creating excessive inventory. Monitoring work in progress queue levels identifies capacity imbalances across manufacturing work centers. Flow control algorithms adjust job dispatch priorities dynamically.
