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.
Full Lean and Six Sigma Courses. 1  Black Belt Training & CertificationFrom: $999.00. Add to cart. 2  Lean Training & Certification$449.00. Add to cart. 3  Green Belt Training & Certification$699.00. Add to cart.  Yellow Belt Training & Certification$99.00. Add to 1  cart. Chinese Yellow Belt Training & Certification$99.00. Add to cart.