8 min read · Interactive · TaktClock Learning Center
Value Stream Mapping (VSM) is the lean tool for visualizing the entire flow of materials and information required to bring a product from raw material to finished goods. It reveals where value is created and where time is consumed without creating value — across the whole process, not just individual steps.
The uncomfortable truth VSM reveals: In most manufacturing operations, only 2–5% of total lead time is value-added time. The remaining 95–98% is waiting, moving, inspecting, and storing.
Current State vs. Future State
📊 Value Stream Analysis — Example Harness Assembly
Current State
Procurement
5 days
Queue
2 days wait
Wiring
2.2h ✓
Queue
1.5 day wait
Testing
1.5h ✓
Queue
1 day wait
Ship
0.5h
Total lead time: 9 days Value-added: 3.7h = 5.1%
Future State Target
Procurement
5 days (pull)
Queue
4h target
Wiring
2.2h ✓
Flow
1-piece flow
Testing
1.5h ✓
Flow
Immediate
Ship
0.5h
Target lead time: 6 days Value-added: 3.7h = 7.7%
Key VSM Metrics
Metric
Definition
Target
Value-Added Time
Time spent on operations the customer pays for
Maximize
Non-Value-Added Time
Waiting, transport, inspection, rework
Eliminate
Total Lead Time
Order receipt to delivery
Minimize
Process Cycle Efficiency
VAT / Total Lead Time
Target 25%+
❓ Knowledge Check
A VSM shows that a part spends 12 days in the factory from raw material to ship. The total value-added time is 6 hours. What is the process cycle efficiency?
✓ Correct! 12 days = 288 hours. PCE = 6 / 288 = 2.1%. This is typical for batch manufacturing before lean improvement. The 97.9% non-value-added time is the improvement target — primarily the queue times between steps, not the actual processing time.
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