Lean six sigma diagram software diagram. This is one of the top business frameworks helping clients improve on their approach to strategy, project management, IT, HR, internal processes and client experience.Lean six sigma diagram softwareLean Six Sigma is a five-step process used to improve a company’s processes. It is an approach to continuous improvement. Six sigma is the most widely known process improvement method. The Lean Six Sigma Method (LSSM) was developed by former IBM employees, Dr. K. John Holland, who is considered the father of Lean and Six Sigma, and Dr. Paul W. Eastman. The LSSM was first described in the book “Lean Six Sigma: A Practical Guide to Statistical Process Control” in 2000. History