What VSM is
Value Stream Mapping (VSM) is a visual tool that represents every step — physical and informational — required to move a product from customer order to delivery. It's the second of the 5 principles of Lean Manufacturing and the foundation for prioritizing any improvement project.
Step-by-step mapping process
Choose the product family
Mapping everything at once is impractical; pick one product or family that flows through similar steps.
Walk the physical process (Gemba)
Walk the shop floor from start to finish, timing real cycle times — not "paper" times.
Record data at every step
Cycle time, changeover time, headcount, in-process inventory, and quality rate.
Map the information flow
How orders arrive, how production is scheduled, and how information moves between departments.
Calculate total lead time
Add up processing and waiting times to get the total order-to-delivery time.
Current state vs. future state
The current state map shows the process exactly as it works today, with every waste visible. From there, the team draws a future state map: how the process should look after removing waiting, cutting inventory, and leveling production. The gap between the two maps becomes the action plan, usually prioritized by lead-time gain per unit of investment.
You can't improve a process you've never mapped end to end.
Common mapping mistakes
- Mapping from ERP system data instead of measuring the real process on the shop floor
- Trying to map every product at once, rather than one family at a time
- Stopping at the current-state map without drawing a future state and an action plan
- Not involving the operators who run each step in the mapping session itself
Want to apply VSM alongside other Lean tools?
See the complete guide to the 8 wastes VSM helps expose.
Read the article
About the author
Lean Manufacturing & Behavioral Management Specialist
Over 20 years in the automotive and metalworking industries (GM and Dana), Lean Manufacturing practitioner since 2006. SENAI instructor and mentor in Brazil’s Brasil Mais Produtivo program, delivering consulting, training and audits for 50+ companies, combining quality, productivity and people development.