Dr Hemant Bramhne

Dear Suresh and Wishwadeep, Thanks for explaination. I really misunderstood it. I thought 4 defects/ million operations( Same operation carried out 1 million times with only 4 errors). I am involved in manufacture of Biological products. Till now we have made 100 batches of 60000 units each. Each batch manufacturing involves ( if we go to hair splitting) about 700 steps. We have not failed a batch till now. Can I multiply 700 X100=70000 with Zero defects / 70000 which will take to sigma around 5?

I am new to this concept bit I have read some books on this. One thing really confuses me is one statement - "errors detectable by customer". ( 4 / million)Is this true)? If it is there are many products where the customer will not know the difference or will notice after years. For example, Soft drinks are being projected as health hazards after years and tons of consumption. Will this constitute failure? One more thing (I read a question on implementation of Six sigma in Microbiology and one on hand made products). Machines and human beings are different. I wonder if a human being can ever guarantee to breathe same way even 100 times ( I know I am stretching it too far). Anyway, my main question is - is it to be targetted to detectable by the customer or in real? Regards, Dr Hemant