Every day, approximately 4,000 dabbawallahs deliver 160,000 home-cooked lunches from the kitchens of suburban wives and mothers direct to Mumbai’s workers in “the world’s most ingenious meal distribution system.” (Hey UPS, how’s that for logistics?)

Dabbawallahs pick up the home cooked lunches in the suburbs, hop on trains, and deliver them, via bike, to Mumbai office workers. Later on, they pick up and bring back the same empty tiffins (the name for the metal containers used).

Despite the lack of fuel, computers, or modern technology involved, a tiffin goes astray only once every two months. So for every six million tiffins delivered, only one fails to arrive. That’s why Forbes awarded the dabbawallahs a 6 Sigma performance rating (a term used in quality assurance if the percentage of correctness is 99.9999999 or more).