Six Sigma is a data-driven process improvement methodology. Used for either process improvement for an existing process or creation of a new process for the requirement of the business. Six-sigma seeks an output almost defect-free from the process involved in the production. So, to meet these requirements there is a variety of six-sigma certifications are available, for example – Yellow Belt, Green Belt, Black Belt, and Master Black Belt or the Six Sigma can be segmented on the basis of the methodology being used for this purpose, like – DFSS, DMADV, and DMAIC. These high levels of categorization can be used either as new process creation or improving an existing process not meeting the desired level of performance. Please go through the belt level segmentation provided in the submenu of Six Sigma Training category for more details.