[Techtalk] Six sigma projects

[Sue Stones]

I don't know if this is the right list for questions about project 
management, but everything seems a bit quiet at the moment so I will 
post it here.

Does anyone know anything about Six-sigma projects?  I am trying to 
learn about them for an exam.  they are mentioned in the text book for 
IT project management, but it doesn't say how the principles apply to an 
IT project.  There are 2 units of measure (1) defects per million, (2) 
seven run rule.  Even though this is an IT project management text book 
the examples of what these mean are based on manufacturing, and there is 
no indication of how this apply to an IT project.  The seven run rule 
may be used say for size of a manufactured item; if there are seven 
items in a row that are below or above the mean, or that are increasing 
or decreasing in size then there is a problem.

So if there happens to be anyone who has had any contact with six sigma 
would you be able to explain how this applys to an IT project.

sue