What are the principal of six sigma?

The main principles of Six Sigma or Six Sigma Principles are:

• Customer must benefit in a way they understand and value
• Managers must direct and lead Six Sigma, they decide on targets and projects
• The targets must be significant and the payback should be clear - up-front
• The whole process should be based on measurable facts
• Six sigma based on improving the system not the people working within the system