Six Sigma is a problem solving methodology that uses statistical tools and techniques to greatly reduce the frequency of defect and errors within products and services. Six Sigma initiatives increase customer satisfaction and decrease operating costs by identifying, analyzing and eliminating variation within production, business administration and customer service processes so that defects and errors can be measured in units per million or even units per billion. Typically, Six Sigma is implemented through the performance of targeted improvement projects that apply the proven DMAIC approach to a specific production or administrative process. When implemented in this way, each Six Sigma project consists of a Design, Measure, Analyze, Improve and Control phase. Most projects can be performed by qualified Six Sigma Green Belts, with Six Sigma Black Belts assisting in the project chartering, data collection, data analysis and improvement sustainability aspects of the project as needed. More intensive projects may require the extensive experience typically held only by certified Six Sigma Black Belts or Master Black Belts.