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.
Lean Six Sigma Yellow belt is the first step into Lean Six Sigma training. In this 2 day classroom course you will follow the DMAIC methodology (Define, Measure, Analyze, Improve and Control) while learning the tools necessary to perform at a Yellow Belt level on a project team.