What is Value Stream Mapping?
A lean management technique that visualises all the steps in a process, distinguishing between value-adding and non-value-adding activities.
Detailed Explanation
Value stream mapping (VSM) is a diagnostic tool that traces the complete flow of materials and information from customer request to delivery, categorising each step as value-adding (something the customer would pay for), necessary but non-value-adding (required but not valued by the customer, such as compliance checks), or pure waste (activities that add no value and are not required). The resulting map reveals the ratio of value-adding time to total lead time, which is often surprisingly low. VSM provides a clear picture of improvement opportunities and helps prioritise which changes will have the greatest impact.
Why It Matters
Most businesses are shocked to find that value-adding activities account for less than 5% of total lead time. Value stream mapping makes this waste visible and provides a shared understanding of where to focus improvement efforts for maximum customer and business impact.
Example
A food manufacturer maps their value stream from raw material receipt to finished product dispatch. They discover that product spends 80% of its time waiting between processing stages. By redesigning their production schedule to reduce batch sizes and improve flow, they cut total lead time from 5 days to 2 days.
Related Terms
A visual technique for documenting every step in a business process using flowcharts, swimlane diagrams, or similar tools.
The total time from when a customer places a request until the request is fully delivered.
An ongoing effort to incrementally improve products, services, or processes over time through small, sustained changes.
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