This document provides an overview of the Mumbai Dabbawala lunch delivery service. It discusses the evolution and operations of the 127-year-old service, which delivers 200,000 home-cooked lunches daily in Mumbai using an effective coding system and supply chain network with over 5,000 workers. The dabbawalas achieve remarkably high reliability and efficiency, with an error rate of only 3.4 mistakes per million deliveries, demonstrating Six Sigma quality standards through teamwork and coordination across their robust logistics operation.