I will soon be helping my 16 year old claim PIP for autism, dyspraxia and mental health difficulties. I am not his appointee as he is not cognitively impaired (other than the slow processing difficulties his autism can cause). I will help him write the assessment form and be with him during the phonecall. Has anyone been in this situation and successfully claimed? I have had a look at the descriptors and he does meet these, more because he has a lot of executive dysfunction and 'freezing' during tasks (and on bad days would not be able to do much). I would be grateful for any advice. I think while he doesn't lack capacity he does need a 'companion' to help during phonecalls/appointments to add information/remind him to mention certain things. Can you ask for someone else to help expand on things at your PIP assessment if you have not got an appointee?