Dabba Walla Is 6 Sigma Or 8 Sigma

hi,
im shreedevi.
i have a presentation on dabba walla logistics, but i heard it to be a six sigma and even a 8 sigma one. so people who know about this , can u help me regarding this
Regards
Shreedevi

Hello friend,
If the number of defects are 6 in total 100000000000 transactions then it is considered as EIGHT SIGMA.
Mumbai dabbawalas make 1 error/defect in 6,000,000 transactions so the sigma level is lower at 6.6 sigma.
In simple words if the number of defects are more the sigma level is lower.
If about 6 defects occur in 1 million transactions it is Six Sigma. You may see the sigma calculator at following link.
Process Sigma Calculator <link updated to site home> ( Search On Cite | Search On Google )
Since the errors committed by Mumbai dabbawalas is so less that it can be termed as almost defect free and we may call it "eight sigma" metaphorically.
Regards
nishikant