While ancient Greek mythology is often referenced in theater, manufacturing and other fields have developed their own mythology, particularly around lean manufacturing and Six Sigma. A common misconception is that lean focuses solely on speed, while Six Sigma is only about quality.

This podcast episode explores this myth as part of a series on misunderstandings related to lean and Six Sigma.

Key Differences and Misconceptions

The discussion highlights that if lean were only about speed and Six Sigma only about quality, Toyota would not be known as a manufacturer of some of the highest-quality cars. Historically, the success of the Toyota Production System was primarily due to its focus on high product quality.

Lean is not just a method for speeding up processes, but a system for creating value by eliminating waste. The Toyota approach emphasizes removing obstacles to smooth flow, rather than increasing speed for its own sake.

Terminology and Approaches

During the discussion, it is noted that Toyota itself does not use the terms lean or Six Sigma, but instead refers to its own production system. Some experts prefer to call this approach team-based continuous improvement, as it encompasses all aspects of the organization.

Lean aims to eliminate various types of waste, including quality defects, making quality a central element of the system. At the same time, Six Sigma is essential for understanding and managing process variability. To effectively improve quality, it is important to distinguish between types of variation and understand who is responsible for addressing different kinds of waste.

Tools and Philosophy

Examples of lean tools focused on quality include standardized work and ensuring quality at the source. Lean is described as an umbrella term that includes quality issues, unlike Six Sigma, which does not cover as broad a range of tasks.

Six Sigma is seen not only as a set of tools but also as a system, though it is less comprehensive than lean. The discussion includes examples of integrating lean and Six Sigma, and emphasizes that the principles of continuous improvement are more important than the use of specific terminology.

Practical Application

Some companies avoid using the terms lean and Six Sigma, focusing instead on the values and principles underlying these approaches. Even when lean ideas are applied in practice, the terminology itself may not be used.

Conclusion

In conclusion, it is emphasized that lean is not just about speed. The core principles of lean include ensuring flow and quality at the source, making quality one of the key elements of this system.