towxg said:
Marc, if what you said is right, the process approval acceptance creteria = the product (process output) acceptance creteria.
But I think the TS requirement is not saying so.
I think the process approval acceptance creteria may be something like " the Cpk of process must be > 1.33 " etc.
Am I right??? Any other ideas?
Don't read too much into the requirement. It is simply saying that you must include as part of the Process Design Output, what you will be using as your accept/reject criteria. There is no right or wrong answer as long as your criteria satisfies the process input requirements. As Marc says, if there is a Cpk requirement then maybe the approval is based on the Cpk. Obviously, you can't include every part in the analysis so how many will you use to make your Cpk determination and what value is the pass/fail value ? That would be the acceptance criteria. If the requirement is dimensional, then maybe passing a go/no-go test is the criteria. If the requirement is a non-critical color, maybe a simple visual inspection is the criteria.
What will the final inspector look for before saying "Parts are OK to ship"? This is probably different in every process. Look at the requirements then when you design the process to meet the requirements, determine what you will do as a final check to make sure you have met those requirements. Try to keep it simple and don't define something that you won't be able to maintain in your process.
Remember, most of the requirements of the process are addressed within the process so they don't necessarily have to be re-verified at the end of the process. If, for example, you had a dimensional requirement that was addressed in the process by engineering the tooling to error proof the dimension, it would make little sense to establish controls other than periodic verification for that dimension. In such a case, even though the dimension was a critical characteristic, it would be redundant to make measurement of that dimension the acceptance criteria. In theory, all the process controls you have put into the process should do what they are supposed to do and if there is a failure, it will be corrected per the control plan. Those problems shouldn't show up at the end of the process. If you had multiple tests durring the process, maybe verification of passing all the tests would be your acceptance criteria. If so, say how you will verify it.
Dave