There is an ongoing debate regarding the difference between Lean and Six Sigma and whether they are mutually exclusive.

Lean is about eliminating wastes, taking time out of processes and creating better flow. In essence the Lean is shortening the time-line from order receipt to collecting the cash from the goods or services provided. Six Sigma has many different definitions. One states: Six Sigma is a business strategy and philosophy built around the concept that companies can gain and consolidate competitive edge by reducing defects in their industrial and commercial processes.

Both Six Sigma and Lean are very focused on satisfying customers. Six Sigma is making the customer the driver for action in a “war on variation” and identifies opportunities that promise a large financial reward. Lean considers customer inputs and conducts a “war on waste”. Both Six Sigma and Lean empower people to create process stability and a culture of continuous improvement.

 

Topic Six Sigma Lean
Improvement Reduce variation Reduce waste
Justification Six Sigma Speed
Main Savings Cost of poor quality Operating costs
Learning curve Long Short
Project selection Different approaches Value stream mapping
Project length 2 - 6 months 1 week - 3 months
Driver Data Demand
Complextity High Moderate

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Never mind, it was in my briefcase all along.