"Disability policy is full of examples of yesterday’s innovation becoming today’s indignation. As my friend Anne Donnellan once put it, “The mark of anyone good in disability service-provision is that they’re at least a little bit ashamed of what they were doing twenty years ago.” The opposite of this is also true – many of the worst disability services come from becoming too attached to program models that were considered state of the art in previous decades." -- Ari Ne’eman: (Almost) Everything You Need to Know About Sheltered Workshops: [Part 1] [Part 2]
I won't try to explain the pros and cons of the two "identification models." I am not very good at parsing out the different justifications for each one. I will say that once I bought into Identity First Language, I did so enthusiastically, mainly because it's easier to say and write. "I'm disabled" just sounds smoother and less cumbersome than "I am a person with a disability."