The value stream is the arena where value is created. By considering what is value creation and what is not value creation, a map is made forming the basis upon which to see the potential for improvement.
Facts about a detail in a product family flow are generated and a map drawn up describing the flow's processes, connections and governance. Non value-adding activities are separated from the value generating ones. The map is used as the basis for developing a new map of a desired future situation.
Only when the flow is considered as a whole, can the results of the efforts of individual processes be seen. By working with the entire flow, the right steps can be taken to reduce the throughput time and increase delivery capacity.