Most of the companies and business who runs the material based product and processes which involves complex steps needs a lot of attention to detail to ensure and find where the missing occurs.

Value-stream mapping, also known as material- and information-flow mapping, is a lean management method for analyzing the current state and designing a future state for the series of events that take a product or service from the beginning of the specific process until it reaches the customer. A value stream map is a visual tool that displays all critical steps in a specific process and easily quantifies the time and volume taken at each stage.

The purpose:

The pupose of value stream mapping is to identify and remove or reduce "waste" in value streams, thereby increasing the efficiency of a given value stream. Waste removal is intended to increase productivity by creating leaner operations which in turn make waste and quality problems easier to identify.