Two factors (Waste and Process Variations) often combine to prevent operational excellence in organizations thus leading to poor product and service quality or outright reduction in productivity, leading to customer dissatisfaction, and lower profitability.

Some methodologies or techniques will eliminate these problems from occurring during the production process, leading to operational excellence thereby meeting organizational bottom lines. These methodologies and systems are the Lean techniques and the Six Sigma methodology.

Lean is a process improvement method that eliminates waste and increases productivity.

Six Sigma Methodology is a process improvement method that enhances products or services output by removing defects

Lean Six Sigma combines both the Lean method and the Six Sigma method to create a systematic approach and techniques that help organizations improve their processes to achieve operational excellence.