7+1 Wastes in Lean

Introduction: 7+1 Wastes in Lean

The 7+1 Wastes are a key concept in Lean, describing the main types of inefficiency that reduce value for customers. First defined by Taiichi Ohno, the creator of the Toyota Production System, the original seven wastes were later expanded with an eighth: the waste of human potential.

Background

The idea comes from Lean’s focus on eliminating Muda, or waste. Ohno identified seven categories of waste that appear in processes, whether in factories, offices, or services. Over time, Lean practitioners added an eighth category to highlight the importance of using employee skills and creativity.

Key Elements / Features

The eight wastes are:

1. Transport – Unnecessary movement of materials.
2. Inventory – Excess stock tying up resources.
3. Motion – Unneeded movement of people.
4. Waiting – Idle time for staff or machines.
5. Overproduction – Making more than is needed.
6. Overprocessing – Doing extra work or higher quality than required.
7. Defects – Errors that lead to rework or customer complaints.
8. Skills (Talent) – Not using people’s knowledge and abilities.

Applications / Examples

In manufacturing, overproduction creates stock that sits unused. In healthcare, long patient waiting times represent waste. In offices, failing to use employee ideas is a waste of talent. Teams often use tools like Value Stream Mapping or Kaizen events to spot and reduce these wastes.

Relevance / Impact

Eliminating the 7+1 wastes makes processes faster, cheaper, and more effective. It improves customer satisfaction and employee engagement while reducing costs. This waste-focused mindset is at the heart of Lean thinking and continuous improvement.

See also

• Muda
• 3 MU
• Continuous Improvement
• Lean