Six Sigma provides the opportunity and discipline to eliminate mistakes, improve morale, and save money (Henderson and Evans, 2000). Doing things right in the first time and keeping them consistently is the only idea behind Six Sigma. Its fundamental objective is to achieve customer satisfaction...

In this study, three different distribution planning Supply Chain (SC) models for multilevel supply chain designs are considered. Demand is generated at the customer end and products which are manufactured in factories are delivered to customers through distribution centres and retailers. The...