I haven't observed any of my daughter's testing. My DS had developmental delays (he is now academically advanced) and I was usually present for his assessments. Interestingly, this even included an assessment with the psychologist who did my daughter's first assessment without me present. My DS once shut down and wouldn't do anything in an evaluation when I wasn't there (it was awful because they reported very severe delays rather than saying he just didn't cooperate). So I think the psychologist made an exception to usual policy based on thinking he would be much more comfortable with me there and that the results might not be meaningful otherwise. I just stayed in the background, but it was interesting to see which specific questions gave him difficulty. It gave me much more insight than just knowing the scores would have.