Creating an ideal state VSM. Value stream mapping VSM is a lean manufacturing tool that seeks to map your process from supplier to customer, highlighting the flows of product and information and identifying delays and non-value adding processes. Value stream mapping is a lean tool that can be used to map processes in detail, based on the both the flow of material as well as information. Data boxes make it possible to write important aspects of each process step, such as changeover times, cycle times and machine availability, which makes value stream mapping a great tool to use in re. VSM is a powerful Lean tool, combines material flow and information flow on a map. In this the processes are mapped such that the whole Lean team visualizes and understands the processes and the sequential material/work flow.