Another website does suggest getting the doctor to write a note. I have read on earlier threads that you can actually explain the needs of your child to the castmember and they can give you a card, or you can write down the diagnosis and needs if you feel uncomfortable talking about the situation in front of your child or might get upset when discussing your child's needs. Another poster suggested taking along written reports or IEP notes to show diagnosis, but you have to discuss the child's needs and not just the diagnosis. I plan to get one for my DS who is PDD-NOS, but I am hoping to use fast passes and go early so that I do not have to use the card any more than necessary.