SixSigma.us offers an internationally-recognized Six Sigma Green Belt training and certification program. As part of our four-week Black Belt option, our Green Belt Certification program may be taken alone or as the first step to earning your Black Belt. In fact, SixSigma.us was the first organization to offer a program that allowed students with no prior experience to complete the Green Belt and Black Belt programs consecutively to earn an internationally-recognized Black Belt certification.