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- "Forbes never certified the dabbawalas as being a six-sigma organization. In fact, I never used the term at all. As you know, six-sigma is a process, not a statistic. But it is commonly associated with a statistic of 1.9 errors per billion operations, and that is what caused the confusion … . I was impressed by the efficiency and complexity of the process by which some 175,000 tiffin boxes were sorted, transported, delivered and returned each day by people who were mostly illiterate and unsophisticated. I asked the head of the organization how often they made a mistake. He said almost never, maybe once every two months. Any more than that would be unforgivable to customers. I did the math, which works out to one mistake in 8 million deliveries—or 16 million, since the tiffin carriers are returned home each day. That is the statistic I used. Apparently, at a conference in 2002, a reporter asked the president … whether the tiffinwallahs were a six-sigma organization. He said he didn't know what that was. When told about the 1.9 error-per-billion statistics, I'm told he said: "Then we are. Just ask Forbes". The reporter, obviously without having read my story, wrote that Forbes had certified the tiffinwallahs as a six-sigma organization. That phrase was picked up and repeated by other reporters in other stories and now seems to have become part of the folklore." (en)
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