It is also known as 7 waste types. It is the name of any action that consumes resources rather than creating value for the customer. The main categories of these wastes are;
waiting, error / repair, idle overproduction, doing more than necessary / needing, excess / less transportation, excess stock and unnecessary movement.
It is defined as overloading machinery, equipment and people over their capacity.
It is called the situation where production planning and production amount is not regular, and fluctuations occur by temporarily rising and falling.