What Rick said, plus I think there should be some sort of PRIA cleanup program like some airlines use with their strike systems. A trainee screws something up and earns a strike, but they can remove a strike through a decent performance next time. Take a 6 month PC smoothly, for example and get a point scrubbed off the list. People apply for airlines having no idea what they are getting into, they hook a training event and that's it, their done. That's not good for either the pilot or for industry, and the fact of the matter is people are not rigid in general aptitude and competence. They can change through additional learning experiences and may reach a point where they are adequate to the task. At one time there was a rolling PRIA window, but now it apparently lasts forever.