http://coalindia.org/orca/topic/Six-Sigma.htm Six Sigma Thu, 5 Feb 2009 8:34:16 GMT http://coalindia.org/orca/topic/Six-Sigma.htm Six Sigma is invented by again INDIANS - Bombay Tiffenwallas. Thu, 5 Feb 2009 8:34:16 GMT http://coalindia.org/orca/topic/Six-Sigma.htm#144