The Public Switched Telephone Network - The public switched telephone network (PSTN) is the international network of circuit-switched telephones. Learn more about PSTN at HowStuffWorks. x
Black Belt Certification. The IASSC Certified Lean Six Sigma Black Belt (ICBB) is a professional who is well versed in the Lean Six Sigma Methodology, who leads improvement projects, typically in a full-time role. A Lean Six Sigma Black Belt possesses a thorough understanding of all aspects within the phases of D-M-A-I-C.
Once you've completed your Six Sigma Black Belt certification, you may decide you want to take your studies even further. If so, MSI offers our Six Sigma Master Black Belt certification and Project Simulators. MSI also offers a Lean Six Sigma Black Belt for those looking to have the Lean component in their certification. If you aren't looking to lead projects or function in the role of a project manager, you may also want to consider our Six Sigma Green Belt certification.