1 Eliminating the queue of work dramatically quickens the time it takes a part to flow through the system. What are the disadvantages of removing those queues? Value stream mapping involves first developing a baseline map of the current situation of a company's external and/or internal operations and, then, applying lean concepts,developing a future state map that shows improved operations. Exhibit 12.14, for example, shows the current state with a pro- duction lead time of 4.5 days.