Process Variation Control
To achieve this almost perfect level in quality, Six Sigma focuses on reducing the variations that can occur in a process such as variations in:

Materials
Equipment
Methods
Conditions

Customer Orientation
Six Sigma tackles all projects from the perspective of the customer. A gap between what the customer desires and what the organization can currently deliver is seen as an opportunity to create significant value.

Six Sigma's Roots
Six Sigma has incorporated and adapted techniques from many other methodologies such as Total Quality Management (TQM), Design of Experiments (DOE), Failure Modes Effects Analysis (FMEA), etc.

Bottom Line Results
The potential impact on the bottom line is projected prior to starting a Six Sigma project and an evaluation is made at the end to determine if the financial goals have been met.