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In studying sensory perception there is a measurement called the JND, or Just Noticeable Difference. If you draw an ellipse, or oval, and gradually make it more circular....At what point do you perceive, notice that it is no longer oval, instead may be defined as a circle? Similarly for a PAP there are JND in self perceptions. This requires continuous (as distinguished from continual) self assessment and re-integration of the self. One of these epiphanies, an anecdote. I was in my study with two people from our local newspaper. I was referred to in the third person , worse than second class citizenship, when one asked, "Is this his room?" There is a whole network of nomological variables that enter into a PAP decision to retire. One Physical Therapist claims to do evaluations and write reports about a client's potential to return to work. Absent from his testing were some critical. variables, namely, endurance, stamina or sustained energy levels, such as are in short supply for a PWP. Who best becomes the judge or arbiter for making complex employment decisions.