The document provides information about the Mumbai Dabbawala supply chain system. It discusses that over 5000 Dabbawalas deliver over 200,000 tiffin boxes (lunches) daily across Mumbai using a complex logistical system and coding scheme. The Dabbawalas achieve a virtually Six Sigma level of accuracy, with over 99.99999% of deliveries made correctly. Their efficient system has received international recognition and they are regarded as a model of supply chain management.