Jack, 

     Many of the ideas in your essay on the "curious incident" are very good and
   your writing is direct and effective.   But the idea that Christopher becomes
   understandable because his actions are "repetitive" does not strike me as the
   strongest part of your argument. Just because someone does the same thing many 
   times doesn't necessarily make what he or she does more understandable.  Couldn't 
   a reader just get used to the behavior and know what to expect without 
   necessarily knowing exactly why Christopher does what he does?  I think the 
   fact that the author Mark Haddon has Christopher himself describe his mental 
   states is what makes your reaction possible.  Along the same lines, doesn't 
   Siobhan have a deeper understanding of Christopher through her training as a 
   special ed teacher? I'm glad, though, that you feel you have come to understand
   Christopher, because crossing that border of empathy is one of the things we 
   hoped everyone would experience in reading this book.  

     I also have a few (relatively minor) comments about smaller points and 
   writing issues:

   (1)  In the sentence "When interacting with autistic people can be hard because 
        of their lack of emotion and inability to socialize, ... " you don't want the 
        "when" -- just delete it and start with "Interacting with autistic people ... "
        It looks as though the "When" might have come from an earlier version of
        the sentence with something like "it can be hard ... "

   (2)  "break down" should be "breakdown" (one word) if you are using the noun
        meaning a mechanical or psychological failure

   (3)  When you describe an incident like the one where Christopher punches the
        police officer, it would be good to put in more details about
        the situation. 

   (4)  From page 3:  I think "everyone else is like his enemy" is too strong. 
        Christopher certainly feels threatened by new, unfamiliar people, but 
        I don't think he feels that way all the time, or about everyone besides 
        Siobhan. It's his reaction to certain particular situations.  "But, the 
        reader is in a very similar situation as Siobhan."  You don't need the 
        comma after the first word.  Moreover, the rest of the sentence is sort 
        of awkward.  How about "The reader and Siobhan are in very similar siutations."

   Content:  88 (B+)

   Mechanics: 92 (A-)