What does "Lean" refer to in Six Sigma?

In Six Sigma, "Lean" specifically refers to a methodology that concentrates on minimizing waste within processes while ensuring that productivity and value for the customer are maintained. The core principle of Lean is to enhance the overall efficiency by identifying and eliminating activities that do not add value to the end product or service.

This approach utilizes various tools and techniques to streamline processes, such as value stream mapping and the 5S system, allowing organizations to operate more effectively. It is not solely about increasing productivity, which may lead to hasty processes that overlook quality or the value to the customer. Instead, Lean emphasizes the harmonious balance of productivity and waste elimination to ensure that every step in a process adds value.

Focusing on employee training alone does not encompass the full scope of Lean, as it primarily addresses process efficiency rather than the development of personnel. Similarly, while Lean principles can indeed assist with project management, referring to it merely as a project management tool overlooks its broader applications and underlying philosophy related to waste reduction and value creation.