The GAF is highly subjective, probably why it's no longer in the DSM. I once had three different GAFs on the same day from different people when I was in a hospital. What it really meant is how well I responded to the particular person interviewing me. I'm much more withdrawn with the more assertive and happy-happy person than I am with a serious all business person. I really dislike happy-happy people when I'm not doing well so they rank me lower.