Value Stream Mapping
Value stream mapping is a visual diagram that represents the
activities to produce a product or service through the
design, source, make, and deliver functions. Creating a value stream is the first step required in any lean improvement initiative.
One uses this tool to graphically represent the current state of a
process. The graph includes icons to show the sequence of materials, processes,
and information for the specific process.
The map shows two main components. The value stream illustruates the flow of materials through the transformation processes to produce the finished goods or services. The map also documents the flow of information to support the transformation process for the finished goods or services. If you leave off the information flow, you limited the benefit of the value map.
With the map you can identify waste and then determine the process's future afte the elimination of the non value added steps. Combine the map with the lean principles and lean tools to truly transform the enterprise and achieve improvement. Think about the map's visible opportunities to drive out waste and the resulting significant positive impact on the financial performance for the enterprise and all stake-holders.
It is not uncommon for a specific value stream to yield 5% value-added content to 95% non-value-added content.
The map lets you...
*Create a graphic visualization of the entire material and information flow for the current-state value stream.
*Show linkages and connections between information flow and material flow.
*Identify sources of waste in the value stream.
*Provide common language for talking about the processes.
*Make decisions about the apparent flow.
*Form the basis of an implementation plan to identify and eliminate wastes.
*Identify non-value-added steps, lead time, distances traveled, and amount of inventory for a process.
a common language for discussing the future-state value stream and
identifying gaps between the current state and future state.
An example of a process map for blood bank operations is shown below.