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.
A Six Sigma Black Belt may coach anywhere from two to 10 Green Belts at a time. A typical Six Sigma Black Belt project may deliver anywhere from $50,000 to $350,000 of financial benefit to the organization. If youâre a quick climber on the corporate ladder, Black Belt certification is what you need.