I think I’ve figured out the list of questions here. I. Explanation of STAGES: I see you’ve taken a lot of text straight from the pdf, which is fine. You can quote it directly, in quotation marks, and then add the pdf as your citation.  Or you can paraphrase the text, if that suits you better. 

2. Use STAGES when referring to the total program and Stage one when referring to the “first stepâ€ in the program, which I believe is the test of some basic motor skills. 

3. Trying to imply that you’re not sure what he can do and not sure how to prove what he can do. I think your key here is “the possibility that can perhaps eventually to the followingâ€ and then list the tasks. The last two sentences of your note starting with “Yet he is not able to associate…â€ seems well written to me, so add it to your text.