What is go-no-go profiling? Well basically you get a pass/fail, green light/red light indication at the end of your profile letting you know whether you are in spec or not.
How often are most of us, when we get the “go” or green light at the end of the profile indicating that we finally got the profile in spec, ready to button it up and turn the thermal process over to production?
If I have and in-spec profile does this mean I’m ready for production?
Well, if you think about it, if you are just relying on a go-no-go indication for your profile results you are never sure if your process is at the very limits or somewhere deep within spec. In the case of the former, depending on the demands of your production on your thermal process you could be operating at an out of spec condition during production, even though your profile gave you a green light!
If you are like most production facilities being in spec during production not only matters but having an indication of how far within spec is your process is just as important since depth of being in spec is the only way to ensure continuous quality production. A common tool used for not only determining whether you are in or out of spec as well as how far in or how far out (depth) is using PWI (process window index).
See the blog entry PWI.