Powerful aid to developing robust systems - and in the Aravind case the model is now being looked at by many health authorities around the world. Significantly the core principles can be applied to other operations - and, for example, complex high cost operations like heart by-pass surgery (with a US cost of around $50,000) are being explored - the Indian equivalent operation costs $4000.
(For more details on the Aravind model see C.K. Prahalad's book ("the fortune at the bottom of the pyramid" and www.aravind.org where in addition to details of the organization there are 3 detailed case studies of the organization).