Quality questions

How do you go about determining the cost of quality of an operation?

If you have an operation that produces a certain level of quality and you double the number of inspectors, will the quality go up or down? why?

How is ISO 9000 different from MRPII

What is the meaning of Six Sigma? Give an example of a true six sigma process.

One of the quality gurus once said "you cannot inspect quality into products." I think it was Dr. Joseph Juran, but it may have been Deming. Anybody know for sure?