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at this time wants to give the children the opportunity to make good choices about people they sit by, make new friends, and learn the consequences of sitting by someone who is distracting on their own.

It's at this point in the conversation where I'd be pressing my palms against my eyes, lest I roll them so hard that they pop out of their sockets. What a load of wool-headed nonsense! I'd put my money on the teacher having a great number of issues with third-graders jockeying for seats, your DS's being least among them.

But in your place, I think I might try using this as an opportunity to work with your DS on the issue of his perfectionism, helping him understand that there's no "right" answer, any seat will do, really, and the whole quest for the "best" seats is kinda silly. But if there is a particular place he prefers, or a particular student he'd prefer to sit by, then he might be able to strategize how to get what he wants ahead of the other kids.