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.
What Is Six Sigma Green Belt? Six Sigma is a process improvement method that was developed at Motorola. The Six Sigma approach to continuous improvement focuses on reducing errors and increasing customer satisfaction. Six Sigma is highly adaptable across business environments, and it has proven popular in various industries. Six Sigma Green Belt training introduces an overview of the key concepts necessary to be a successful member of a Six Sigma project team.