targets the stream of the value and, in the process, seeks to identify the areas of improvement. VSM focuses on value in the context of what the customer is willing to pay or what makes the product gain customer satisfaction [17]. The primary goal of VSM is to estimate the lead-time associated with a certain product flow throughout a system [18]. The whole exercise of VSM can be divided into four key steps: (1) identify the product family, (2) create a current state value stream map, (3) create a future state value stream map, and (4) create an action plan.
VSM is always regarded as the starting point of system improvement practices, as it helps in identifying the areas where the improvement efforts should be concentrated. The main advantage of VSM is that it gives an opportunity to examine the chain of process and focus only on the value added activity. The main index of VSM is percentage value addition (%VA) of the system.