Taiichi Ohno defined the 7 types of waste that describe all activity that adds cost but not value.
A process adds value by producing goods or providing a service that a customer will pay for. A process consumes resources and waste occurs when more resources are consumed than are necessary to produce the goods or provide the service that the customer actually wants. These seven wastes are categories of unproductive manufacturing/ production practices identified by Taiichi Ohno, the father of the Toyota Production System (TPS). The categories are an integral part of the TPS.
In a Lean Enterprise these 7 types of “Muda” are the target of an endless pursuit of waste elimination. Learning to see “Muda” all around you is the key to starting out on your journey of transforming your organization into a Lean Enterprise.
Acknowledgement: Taiichi Ohno