The document provides an overview of the Mumbai Dabbawala supply chain case study. It summarizes that the Dabbawala system delivers over 200,000 home-cooked lunches daily across Mumbai using an informal logistics network with almost zero infrastructure. Through discipline, a strict code of conduct, and hard work, the Dabbawalas achieve a nearly perfect on-time delivery rate of 99.9999% with almost no use of modern technology, capital investment, or fuel costs. The Dabbawala system is over 125 years old and continues to grow annually through its highly specialized and efficient operations.