process improvement methodologies Lean, Six Sigma, Total Quality Management

Lean safety is about creating more value for the organization by eliminating activities that are considered waste.
Reflect on your experiences with process improvement methodologies such as Lean, Six Sigma, Total Quality Management, or others. Give specific examples of their contribution to continuous improvement efforts in a safety management system (SMS). Did you find it an effective process? How do you feel it could be improved for greater effectiveness?
If you have no experience with such process improvement methods, reflect on how you believe lean concepts could be incorporated in your current or former place of employment to facilitate continuous improvement in the SMS. Be sure to give specific examples to illustrate your opinions.