Value Stream Mapping (VSM) is a lean manufacturing tool that illustrates a product’s entire journey from supplier to customer on a single map. It shows not only operations but also inventory, queues, time, and the flow of information—that is, where value is actually created and where waste is hidden.
The main idea behind this method is to look at production from the consumer’s perspective. This page brings together everything you need to know about VSM: how a value stream map differs from a process map, what it shows, how to create one, and what to do with the results. You’ll also find practical resources and training on value stream mapping here.
What Is Value Stream Mapping?
From the perspective of lean manufacturing, a company’s operations should be viewed not as a collection of departments or individual production steps, but as a continuous flow of value creation for the customer. A value stream map is a “snapshot” of this flow: it simultaneously describes the material flow (how raw materials are transformed into finished products) and the information flow (how orders and signals move through production).
Value, in this context, is always viewed from the customer’s perspective: the only thing that has value is what the customer is willing to pay for; everything else is a candidate for elimination. This “outside” perspective allows us to see processes differently than they are typically perceived from within the company—through the lens of functions and technologies. This perspective often reveals losses that everyone has grown accustomed to and has stopped noticing.
Process Map or Flowchart: What’s the Difference?
These two concepts are often confused, even though they address different questions. A process map details the steps within a single operation or department—this is useful when you need to streamline a specific procedure. A value stream map takes a broader view: it covers the entire end-to-end flow across multiple processes, shows the time and inventory involved between them, and integrates material and information flows.
Simply put, a process map answers the question “How is this step structured?”, while a flow map answers “Where in the entire chain are we losing time and value?”. The difference between these approaches is discussed in detail in a separate article titled “Process Map or Flow Map?”
What the flowchart shows
The flowchart reveals what is usually hidden in day-to-day work:
- the ratio of value-added time to non-value-added time (VA / NVA);
- total order lead time and the cycle time of individual operations;
- inventories and work in progress between processes;
- information flow and decision-making points;
- bottlenecks and areas where processes are out of sync.
That is precisely why VSM highlights all the major losses associated with lean manufacturing. It is estimated that organizations lose at least 20% of their production capacity due to process inconsistencies and improper inventory management policies—a value stream map helps identify and eliminate these losses. The true value of process visualization is discussed in a separate publication.
Current and Future Status
Mapping is done in two steps. First, a map of the current state is created—showing how the workflow actually operates today. Then, based on that, a map of the future state is designed—showing what the workflow should look like after improvements. The difference between the two is transformed into a concrete action plan.
It is important to note that a value stream map is not a static document. Once changes are implemented, the future state becomes the new current state, and the cycle repeats. This is how VSM becomes a driver of continuous improvement rather than a one-time exercise.
How to Create a Flowchart: Basic Steps
There is a certain logic to creating a map, and it’s worth following it:
- Select a single value—a single product or product family (the product family matrix is used for this purpose);
- to move “from the end”—from the moment the product is handed over to the consumer back to the beginning of the flow;
- collect real-time data directly on-site, at the gaming facility, rather than from accounting systems;
- map out the material and information flows and construct a timeline;
- identify losses, inventory, and bottlenecks;
- envision the future state and develop a roadmap for change.
A step-by-step breakdown using a simple example is provided in the article on the 10 simple steps for creating a flowchart.
Flowchart Symbols and Elements
The map is created using standard symbols—this makes it easy for any team to understand:
- Processes are represented by rectangles, and below them are “information boxes” containing data such as cycle time, setup time, equipment availability, and the number of operators;
- inventory and work in progress —represented by triangles between processes;
- material and information flows — represented by different types of arrows, separately for “pushing out” and “pulling in”;
- The timeline at the bottom of the map distinguishes between value-adding time and waiting time;
- Areas for improvement —so-called “Kaizen hotspots”—that indicate where changes will be made.
A unified notation system is one of the reasons why VSM works well as a common language for different departments. Thanks to this system, a map created at one plant can be easily understood by a team at another site.
What VSM Offers
When applied correctly, VSM allows you to:
- to see the entire stream as a whole, rather than just individual sections of it;
- focus efforts on the real bottleneck, rather than on localized improvements that do not affect the outcome;
- provide the team with a common language and a shared vision of the process;
- Quantitatively assess the potential for reducing time and inventory.
In mapping, time is usually a key factor in driving improvements. The priorities for optimization are simple: make processes simpler, better, faster, and cheaper. Simpler and better reduces the likelihood of errors and improves quality; faster increases productivity; cheaper reduces material and financial costs. This order of priorities prevents the team from making premature investments when it is sufficient to simply streamline the process itself.
Common Mistakes in Flow Charting
The most common mistake is turning a value stream map into a detailed flowchart and getting lost in the branches. To avoid this, follow the “one value—one stream” principle and map the process backward, starting from the customer. Other common pitfalls include collecting data from accounting systems instead of actual observations on the ground; stopping at a map of the current state and failing to project the future; and treating the map as a one-time document “just to check a box.” The biggest mistake, however, is to create a well-designed map and then fail to implement the changes it suggests: without an action plan and its execution, the value of the mapping process approaches zero. Therefore, the map is always translated into an action plan, and individuals responsible for implementing the changes are assigned.
VSM and Other Lean Manufacturing Tools
A flow chart is rarely an end in itself—it’s more like a compass that shows exactly where to apply other Lean tools. Where the chart reveals clutter in work areas, the 5S system is needed; where inventory builds up, a pull-based Kanban system is needed; where flow is halted by unreliable equipment, TPM/WCM is required; and where failures recur, root cause analysis is essential. That is precisely why flow mapping is often the first step in a Lean transformation—it sets the priorities for all subsequent changes. Without a map, improvements can easily become “scattered” across isolated areas, failing to have an impact on the entire flow.
Related Materials
The Basics of VSM
- Value Stream Mapping. Look at your production from the customer’s perspective — a basic introduction to the method and the “customer’s perspective.” Article
- Process map or flowchart? What’s the difference? — When should you use a process map, and when should you use a flowchart? Training
Value and Visualization
- On the Power of Visualizing Processes. What Is the Real Value of Value Stream Mapping? — Why visualize the flow at all? Article
- Mapping the Value Stream as a Tool for Process Optimization —How to Use VSM to Its Full Potential. Article
Map-Making Practice
- Roadmap for Production Optimization: 10 Simple Steps to Creating a Flow Chart — a step-by-step example. Article
- Process Optimization Using Value Stream Maps — A Hands-On Training Session on Creating and Interpreting Maps. Training
- Process Optimization Using Value Stream Maps — A Seminar in the Form of an Event. Event
Development and Connection to Lean
- Lean Process Engineering Program — a program for designing efficient manufacturing processes and workflows. Training
- Creating Lean Manufacturing. The Kaizen Methodology — a basic training course on Lean tools, which includes VSM. Training
Related Tools and Approaches
Flow mapping is closely linked to other lean manufacturing tools:
- The 5S System — order and visual standards in the workplace.
- Kanban — pull-based production and inventory management at the points where inventory accumulates.
- TPM / WCM — Equipment reliability as a prerequisite for a stable flow.
- Root Cause Analysis (RCA) — eliminating the causes of disruptions that hinder the flow.
