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.
The Importance of The White Belt. All belt rankings help Six Sigma projects improve quality, including the white belt because of the supporting role it plays. The white belt is vital to the Six Sigma process for two main reasons. First, the support that they provide is incredibly valuable in itself. Competent white belts can lend extra pairs of hands and eyes to collect data and offer proficient insight into how processes are working.