Well, Ben, I will have to commend you on that reference. I am astonished that such a concept exists. As for the NAIFA, I dont even know what that stands for. I'm an SRA, have been for over 20 years. Strictly AIREA trained. Though I can find no mention in any of my AIREA or AI texts regarding "environmental Obsolescence", (other than the dictionary), they are, as you state, synonymous. But I'm not willing to throw away everything I have ever learned, and everything I have ever read, for this one quip.