The Value Stream Mapping Lead Time Ladder
The VSM timeline ladder separates touch time (cycle time) from queue time (WIP inventory). Eliminating inventory queues delivers dramatic reductions in customer delivery lead times.
Intermediate Category: Lean & Continuous Flow • ~7 min read
Value Stream Map (VSM) Lead Time Analyzer
Identify non-value-added delays and visualize current state vs. future state lead time reductions.
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Q:
How is Process Cycle Efficiency (PCE) calculated in Value Stream Mapping?
PCE measures the proportion of total manufacturing lead time that actually adds value for the customer: PCE = (Value-Added Processing Time / Total Production Lead Time) × 100% Typical unoptimized manufacturing processes exhibit PCE scores below 5%, with 95%+ of lead time spent waiting in inventory buffers.
Process Cycle Efficiency (PCE)0.08%Value-Add / Total Lead Time
Total Production Lead Time3.6 days29.2 hours
Total Value-Add Time88 sSum of Process Cycle Times
Daily Demand480 unitsCustomer Pacing
VSM Process Steps & Inventory Queues
| Process Step | Cycle Time (s) | Changeover (s) | WIP Inventory | Queue Lead Time |
|---|---|---|---|---|
| Stamping | 15 s | 1800 s | 500 units | 8.3 hrs |
| Welding | 25 s | 600 s | 300 units | 5.0 hrs |
| Painting | 20 s | 1200 s | 800 units | 13.3 hrs |
| Assembly | 28 s | 300 s | 150 units | 2.5 hrs |
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