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.
Six Sigma Onlineâs Six Sigma Black Belt Certification curriculum rivals that of the American Society for Quality (ASQ) standard of certification for Black Belts. As a Six Sigma graduate, you will not only make an impact upon your career, but upon your life.