7 Wastes of Lean

The Seven deadly wastes/ 7 Wastes of Lean:

1. Overproduction: Producing items for which there are no orders, which generates overstaffing and storage and transportation costs because of excess inventory.

2. Waiting (time on hand): Workers having to stand around waiting for the next processing step, tool, supply, part, etc., or having no work because of stockouts, lot processing delays, equipment downtime, and capacity bottlenecks.

3. Unnecessary transport or conveyance: Carrying work in process (WIP) long distances, creating inefficient transport, or moving materials, parts, or finished goods into or out of storage or between processes.

4. Overprocessing or incorrect processing: Taking unneeded steps due to poor tool and product design or providing higher-quality products than is necessary.

5. Excess inventory: Excess raw material, WIP, or finished goods causing longer lead times, obsolescence, damaged goods, transportation and storage costs, and delay.

6. Unnecessary movement: Any wasted motion employees have to perform during the course of their work, such as looking for, reaching for, or stacking parts, tools, etc. Also, walking is waste.

7. Defects: Production of defective parts or correction. Repair or rework, scrap, replacement production, and inspection mean wasteful handling, time, and effort.