Six Sigma speaks the language of business (measuring of value throughout the project), and its philosophy is to improve customer satisfaction by eliminating and preventing defects and, as a result, increasing the profitability of the business. The purpose of Six Sigma is to achieve better commercial and quality performance and provide better profits by addressing serious business problems that may have existed for a long time. The driving force behind the approach is for organizations to be competitive and eliminate errors and waste.

There is little new in Six Sigma from the point of view of the tools and techniques used. The method uses statistical tools, among others, and therefore deals with uncertain events to provide decisions based on uncertainty.
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Another difference is the infrastructure that Six Sigma uses. The creation of roles and the responsibilities that accompany them give the method a solid infrastructure. The demand that all projects require an adequate business case, the common way in which all projects are examined, the clearly defined methodology (DMAIC) that all projects follow, provides additional elements of the infrastructure.