How many types of wastes are identified in Lean value stream mapping?

In Lean value stream mapping, seven types of waste are identified. This concept is pivotal in Lean methodology, which aims to streamline processes and enhance efficiency by eliminating waste. The seven wastes consist of overproduction, waiting, transport, extra processing, inventory, motion, and defects. Each of these categories highlights different areas where resources are not utilized effectively—leading to inefficiencies.

The identification of these wastes allows organizations to pinpoint specific areas of improvement within their processes. Understanding and mitigating these wastes are critical for organizations striving for operational excellence and higher quality outputs. By focusing on the reduction of these seven wastes, businesses can achieve better value delivery to customers while maintaining efficient use of resources.

While there are variations that include additional types of waste in specific frameworks—such as the eighth waste of unused creativity— in the context of traditional Lean value stream mapping, the recognized standard is the seven wastes.