1. Purpose and scope
A program that works on a development tester is not yet a production test. It must give the same answer on every production tester and hardware set, at every site, operated by people who did not write it, with its data flowing into the monitoring systems. This stage proves that and releases the test formally.
It ends with two gates: the test capability sign-off, when repeatability, reproducibility and site to site correlation are within agreed limits, and the production test release, when the program, limits, hardware and instructions are released for volume under change control with the quality sign-off in place.
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