What is Value Stream Mapping (VSM)? | Definition, Steps & Examples
Value Stream Mapping (VSM) is a lean management tool that visualizes the entire flow of materials and information required to bring a product from order to delivery. A value stream map shows every step in the process — both value-added and non-value-added — along with key metrics like cycle time, lead time, changeover time, and inventory levels. It reveals where waste exists and guides improvement priorities.
Anatomy of the Chart
- Process boxes
- Each step in the flow, with its data box underneath.
- Inventory triangles
- Where material waits between steps — usually where the lead time hides.
- Information flow
- How each step learns what to make; drawn above the material flow.
- Timeline
- The saw-tooth line at the bottom separating processing time from waiting time.
- Lead time vs processing time
- The two totals whose ratio states the case for improvement.
How to Create
- 1
Select the product family
One family, one map. Mapping everything at once produces a picture nobody can act on.
- 2
Walk the process end to end
Door to door, in person. The map records what happens, not what the routing says happens.
- 3
Draw the current state
Every process step, inventory point, information flow and transport link.
- 4
Record the data at each step
Cycle time, changeover time, uptime, batch size, number of operators.
- 5
Calculate lead time and processing time
Lead time is the total time through the system; processing time is the value-added part. The gap between them is the opportunity.
- 6
Identify the waste
Read the map for where material waits and where information stalls.
- 7
Design the future state
A map with the proposed improvements drawn in, not a wish list.
- 8
Write the implementation plan
A future state without owners and dates stays a drawing.
Accurate cycle time data from video analysis strengthens the data quality of the map — a VSM is only as good as the numbers written on it.
Example
A VSM of a bracket manufacturing process reveals: total lead time is 23 days, but total processing time is only 185 seconds. This means less than 0.01% of the total time is value-added. The map shows 15 days of raw material inventory, 6 days of WIP between stations, and 2 days of finished goods. The future state map targets reducing inventory to 3 days total, implementing flow between welding and assembly, and cutting lead time to 5 days.
Related Terms
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Frequently Asked Questions
Take the template with you
We will email you the element time study template — station, element, category and five cycle columns, with worked example rows already filled in. The same email carries the Yamazo Studio demo links, in case you want to measure the same thing from video instead.